SERVCE

MANUAL

(for 220/24OV]

REVN~N 2 canon

DEC. 1992

COPYRIGNI 0 1992

CANON ING.

FY8-13AM-020

CANON NPZl20/2020 REY.2 LIEC. 1992 PRINTEO IN JAPAN {IMPRIME AU JAPONI d

L- __-- -.. - .)_

._

COPYRIGHT 0 1992 CANON INC.

Printed in Japan

Imprime au Japon

TI ” disclosure of confidential in-

Prepared by

COPYING MACHINE TECHNICAL INFORMATION DEPT. .

COPYING MACHINE TECHNICAL INFORMATION DIV.

CANON INC.

890.12, Kashimada, Saiwai-ku, Kawasaki-shi, Kanagawa 211 Japan

COPYAIGHT 0 1992 C A N O N I H C .

C A N O N NP212012MO REY.1 J A N . 1992 PAINTEU I N JAPAN IIMPAIME AU JAPUNI d

INTRODUCTION

This SERVICE MANUAL is intended to provide the serviceman with a basic knowledge of the NP21 20/2020 and has been compiled to serve as a handy referente for his work in the field.

The NP21 20/2020 is designed to accommodate the following for fully automated copy work:

1. Sorter-Al, MS-AI

2. ADF-AI

3. Paper Deck Pedestal

4. Control Card V

A separate service manual is made available for the Sorter-Al, MS-Al, ADF-Al, and Control Card; see the respective manuals for discussions of each.

In CHAPTER 1 GENERAL DESCRIPTION, a brief discussion of the NP2120/2020’s features, diagrams of its parts, and an explanation of its operation are given.

CHAPTER 2 COPYING PROCESS deals with the innerworkings of the NP2120/2020 which are associated with the generation of copies.

CHAPTER 3 OPERATIONS AND TIMING explains how the NP2120/2020’s electrical and mechanical systems are related to each other with respect to functions and timing of operations.

In CHAPTER 4 MECHANICAL SYSTEM. the NP2120/2020’s mechanical system is discussed as to its operation. disassembly, reassembly, and adjustment.

CHAPTER 5 INSTALLATION gives step-by-step instructions for installing the NP2120/2020 together with checks to make for each step.

CHAPTER 6 MAINTENANCE AND SERVICING contains tables of replacement parts and consumables.

In addition to the above chapters, this SERVICE MANUAL contains a set of appendixes consisting of a general timing chart and general circuit diagrams.

A separate document entitled SERVICE HANDBOOK is also available for troubleshooting problems in the

NP2120/2020.

Note:

The contents of this manual may be updated from time to time to reflect improvements rendered to the NP2120/

2020; a Setvice Information Bulletin will be issued as necessary to cover majar changes.

All servicemen are expected to be thoroughly familiar with the information contained in this manual, SERVICE

HANDBOOK, and Service Information Bulletins, for quick response to the user’s needs.

COPYAIGHT Cc 1992 C A N O N I N C .

C A N O N HPZlZO/ZMO R N . 1 JAH. 1592 PAIHTED I N JAPAH IIMPAIME AU JAPONI

MOOEL:

SERVICE INFORMATION

Issued b y C o p y i n g Mach& Quallty Assurance Cerner. C a n o n Inc

N O . : F-E92-043

DATE: 1992, DEC.

LOCATION

SUBJECT

Document Release

NP2020 SERVICE MANUAL For 220/24OV

The SERVICE MANUAL for the NP2020 has been revised to accommodate the introduction of the NP2120.

AH those concemed are hereby requested to discard the old SERVICE MANUAL and use the document attached for purposes for which the document is intended.

FY8-13AM-02Y

P r i n t e d in Japan

I m p r i m é au Japon

R: Replacement,

S: Supplement,

D: Destroyed,

R E V I S I O N

MODEL : NP21 20/2020

P A G E

CHAP

A

GE MAY JAN. DEC.

1990 1992 1992

RJZVISION

L I S T

CHAP rm PA

GE MAY JAN. DEC.

1990 1992 1992

REVISION

1 1 0 + 1R 3 3 0 + 1R

Page 1

3 lo++

2 0 -t +

31

32

0

0

+

+

-t

+

R: Replacement,

S: Supplement,

D: Destroyed,

R E V I S I O N

MODEL : NP2 120/2020

P A G E

MAY JAN. DEC.

GE 1990 1992 1992

REVISION

L I S T

MAY JAN. DEC.

GE 1990 1992 1992

REVISION

3 3 58 0 -t 1R

Page 2

33

34

35

0

0

0

1R +

1R +

-t +

4 1 0 +

2 0 -t

1R

1R

36

37

38

39

40

41

42

42a -

0

0

0

0

0

0

0

42b -

43

44

0

0

45

46

0

0

+

+

1R -t

+ -t

-t +

+

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+

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+

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+ 1R

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>

6 0 + 1R

70++ so++

90++

10 0 1R -t

11 0 -t -t

12 0 + +

13 0 + -t

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o s

0

0

0

0

0

0

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49

52

53

54

50

51

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17

20

21

22

18

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23

24

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-t

+

-t

+

-t

+

-+

-f

+

+

+

+

+

-t

-t

+

R: Replacement,

S: Supplement,

D: Destroyed,

R E V I S I O N

MODEL : NP2 120/2020

P A G E L I S T

Page 3

20 OS 1R

R: Replacement,

S: Supplement,

D: Destroyed,

R E V I S I O N

MODEL : NP2120/2020

P A G E L I S T

Page 4

23 OS 1R

24 OS 1R

24a - - OS

24b - - OS

25 0 + -t

26 0 + +

27 0 -t +

28 0 -t +

29 0 -f +

30 0 -t +

31 0 -t 1R

32 - - -

33 0 + +

34 0 -t -t

R: Replacement,

S: Supplement,

D: Destroyed,

R E V I S I O N P A G E

MODEL : PAPER DECK PEDESTAL-Cl

L I S T

Page 5

2 1P 0 + +

2P 0 -t +

3P 0 + +

4P 0 + +

5P 0 1R +

6P 0 -t +

7P 0 + -t

8P 0 -t +

3 1P 0 + +

2P 0 -p +

3P 0 + +

4P 0 + +

5P 0 + -t

6P 0 -t +

7P 0 + +

4 1P 0 + +

A 1P 0 -t +

2P 0 + +

3P 0 + +

4P -

5P 0 + +

1. FEATURES ............................................ 1-I

II. SPECIFICATIONS ................................. I-2

A. Type ................................................. I-2

B. Construction ..................................... I-2

C. Pefformance .................................... I-3

D. Others .............................................. I-4

III, NAMES OF PARTS ............................... I-7

A. Externa1 View ................................... I-7

B. Cross-Sectional View ....................... I-8

IV. OPERATION .......................................... I-9

A. Control Panel ................................... I-9

B. Making Copies ................................. l-10

C. Using the Manual Feed Tray

(NP2020) .......................................... l-10

D. Using the Manual Feed Tray

(NP2120) .......................................... l-10

E. Making Two-Sided Copies ...............

1-I 0

F.

Making Overlay Copies. ...................

1-l 1

G. Replacing the CT Unit

....................... 1-i 1

H. Using the COPV DENSITY

CORRECTION Lever.. ...................... I-l 1

1.

Atuo-Start (NP2120) ......................... I-lla

V. WARNINGS AND ACTIONS TO TAKE l-12

A. JAM Indicator ( 8% ) ‘........................ I-12

B. ADD PAPER Indicator ( & ) ........... l-12a

C. ADD TONER Indicator ( h ) .......... I-13

D. CONTROL CARD Indicator (w) ... l-13

E.

@glndicator.. ................................ l-13

VI. ROUTINE WORK BV THE USER .......... l-14

1, IMAGE FORMATION PROCESS ..........

2-1

A. Outline ...............................................

2-1

II. AUXILIARY

PROCESSES

..................... 2-6

A. Blank Exposure Mechanism ............ 2-6

B. Ozone Filter ..................................... 2-6

1.

BASIC MECHANISMS ........................... 3-1

A. Functional Construction ...................

3-l

B.

Electrical Circuitry ............................ 3-2

C. Inputs lo DC Controller ....................

3-4

D. Outputs from DC Conlroller ............. 3-8

E. Basic Sequence ............................... 3-I 1 ll. EXPOSURE SVSTEM ........................... 3-13

A. Varying the Reproduction Ratio.. ..... 3-13

B. Lens Drive Syiem ............................. 3-14

C. Scanner Drive System ..................... 3-18

D. Document Size Identification ........... 3-21

III. IMAGE FORMATION SVSTEM ............. 3-24

A. Outline .............................................. 3-24

B. Basic Sequence of Image

Formation ......................................... 3-25

C. Controlling the Scanning Lamp.. ...... 3-26

D. Controlling the Primaryflransfer

Corona Current and the Grid Bias

Voltage ............................................. 3-28

E. Controlling the Development Bias.. .. 3-30

F.

Measuring the Document Density.. .. 3-33

COPYAIEHT 0 1992 C A N O N ING.

G. Developing Assembly and Drum

Cleaning Unit ................................... 3-36

H. Blank Control ................................... 3-37

1.

Controlling the Transfer Corona

Wire Cleaning Mechanism ............... 3-38

IV. PICK-UP/FEED SVSTEM ...................... 3-39

A. Outline .............................................. 3-39

B. Identifying the Cassette Size ........... 3-43

C. Fixing Assembly and Delivery

Assembly ......................................... 3-44

D. Error Detection Circuit (NP2020) ..... 3-47

E. Error Detection Circuit (NP2120) ..... 3-47a

F. Jam Detection .................................. 3-48

V. POWER SUPPLV ................................... 3-52

A.

DC Power Supply ............................. 3-52

B.

DC Power Supply for Options .......... 3-53

VI. SERVICE MODES ................................. 3-55

A. Outline.. ............................................ 3-55

B.

Using the Service Mode ................... 3-56

VII. SELF DIAGNOSTIC MECHANISM ........ 3-57

C A N O N NP2120/2020 RN.1 DLC. 1592 PRIHTEO IN JAPAN [IMPRIME AU JAPONI

1, EXTERNALS .......................................... 4-f

A. Externa1 Covers ............................... 4-I

B. Control Panel ................................... 4-5

C . Copyboard Cover ............................. 4-5

D. Fans ................................................. 4-5

II. DRIVE SVSTEM .................................... 4-7

A. Lens Drive Unit ................................ 4-7

B. Scanner Drive Unit ........................... 4-9

C. Main Motor Unit ................................ 4-12

III. FEEDSVSTEM ....................................... 4-13

A . Pi&Up Unit ..................................... 4-13

B. Feeder Unit ...................................... 4-16

IV. EXPOSURE SYSTEM . ..____._..._______....,.,, 4-18

A. Illuminating Unit ___...._._._._._.___.........,, 4-18

B. Blank Exposure Unit . . . . . . . . . . . . . . . 4-19

v.

CORONA SVSTEM _.......___.___.._._..........., 4-21

A. Drum Unit . . . .._................................... 4-21

B. Primarv and Transfer

Coroná Units . . . . . . . . . . . . . . . . . . . . . 4-22

VI. DEVELOPMENT SVSTEM _..__._..........,.. 4-25

A.

Developing Assembly . . . . . . . . . ..__.. 4-25

VII. FIXING SVSTEM . . . . . . . . . . . . . . . . . . . . 4-28

A.

Fixing Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-28

LOCATION ............................................. 5-I

UNPACKING AND INSTALLING

THE COPIER ......................................... 5-2

A. Unpacking ........................................ 5-2

B. Mounting the Dium .......................... 5-4a

C. Checking the Operation ................... 5-5

D. Adding Toner ................................... 5-6

E. Checking the Image ......................... 5-7

III. SETTING THE CASSElTE SIZE .......... 5-8

IV. SEnlNG THE CT UNIT ........................ 5-13

V. RELOCATING THE COPIER .................

5-14

VI. SETTING CONTROL CARD V .............. 5-15

VII. ATTACHING THE DOCUMENT

HOLDER ................................................ 5-I 7

1. PERIODICALLV REPLACED PARTS.... 6-1 ll. CONSUMABLES <.<,...___.......................... 6-2

III. PERIODICAL SERVICING ___....._____...._., 6-3

IV. PERIODICAL SERVICING CHART .,,.._, 6-4

1.

2.

3.

4.

5.

6.

7.

GENERAL TIMING CHAR-r.. .................

A-l

SIGNALSAND ABBREVIATIONS .......... A-3

GENERAL CIRCUIT DIAGRAM ............. A-5

WIRING DIAGRAM ................................ A-6

DC CONTROLLER PCB ........................ A - l l

MOTOR DRIVE PCB ............................. A-25

DC POWER SUPPLV PCB .._....<......... A-26

8.

DC POWER SUPPLV FOR OPTIONS .. A-27

9.

ADJUSTING PCB .................................. A-28

10. PRE-EXPOSURE LAMP ........................ A-29

11. AE SENSOR .......................................... A-30

12. HVT ........................................................ A-31

13. LIST OF SPECIAL TOOLS .................... A-33

14. LIST OF SOLVENT AND MATERIAL A-34

COPYAIGHT G 1992 CANOH IHC.

C A N O N NP2120/2MO RB.1 O E C . 1992 PRINTEO IH J A P A N IIMPAIME AU JAPONI

System Configuration

The NP21 20/2020 is designed lo accommodate the following for fully automated copy work:

A D F - A l

A stack of documents may be placed for automatic pick-up a n d feed.

C o n t r o l C a r d V

W i t h t h e card. the volume o f copy work may t e put under watch.

Sorter-Al

U p to 2 0 c o p i e s m a y b e a u t o m a t i c a l l y s o r t e d or g r o u p e d b y page.

I

Paper D e c k P e d e s t a l

Q-rl

\-

MSAl

U p lo 10 c o p i e s may b e a u t o m a t i c a l l y s o r t e d or g r o u p e d b y page.

Stapler Sorter-B2

Up to 10 sets of copies may be automaiically sorted and stapled.

Further, sorted copies may be automatically stapled.

Stapler Sorter-Bl

Up to 10 sets of copies may be automatically sorted. Further, copies may be automatically sorted and then stapled in sequence.

COPYRICHT G 1592 CANON INC.

C A N O N NP2120/2020 R E Y . 1 UEC. 1992 PRINTEO I N J A P A N IIMPAIME AU JAPONI

CHAPTER 1

GENERAL DESCRIPTION

1.

FEATURES..

.........................................

I-1

II.

SPECIFICATIONS ................................

1-2

III.

NAMES OF

PARTS

..............................

l-7

IV.

OPERATION.. .......................................

1-9

COPYRIGNT 0 1992 C A N O N ING.

V. WARNINGS AND ACTIONS

TOTAKE ..............................................

I-12

VI.

ROUTINE WORK BY THE USER.. ....... 1-14

C A N O N NPZl20/2MO KV.0 M A Y 1990 PAINTEU I N JWAN IIMPRIME AU JAPONI

l.GENERALDESCRIPTION BW3

1. Front-loading.

- Thecopier is designed to aCCept cassettes from the frOnt for ease of use (two cassettes holding 250 sheets each).

- The copier is given two cassette holders, thereby eliminating the need forcassetle replacement in making copies of different sizes.

- The copier’s multifeeder allows you to feed multiple postcards (NP21 20)

2. Full line of auto mechanisms.

- The copier has an auto paper selection mechanism as standard, which selects paper of the correct size in response to placement of a document.

- With the auto reproduction ratio selection mechanism, the copier calculates the correct reproduction ratio according to the specified copy size.

- The AE (auto exposure) mechanism ensures crisp reproduction of newspapers and blue-print documents.

- Thecopier’s auto-stafifeature lest you press the COPY START key during the wait period so thatthe copier will start making copies as soon as it becomes ready (NP2120).

3. HQ jumping toner.

* The copier uses Canon? own HQ (high quality) jumping toner for reproduction of clear characters and photos.

- The toner is of a single-component type, which provides stable images.

- In addition, a 30-dia. high sensitivity OPC drum is used to enable enhanced image reproduction and a compact copier design.

4. Man-machine interface.

- As many as 21 copies (A4, landscape) may be made per minute.

. The zoom mechanism allows reduction down to 50% and enlargement up to 200% of the original image.

- The page separation mode serves to speed up copying book-form documents.

- The copier accepts documents as small as a postcard oras large as A3.

- With the CT unit (option), the copies may be in red, green, blue, or brown.

5. A variety of options to choose from for full automation.

The copiercommunicates with its options at a higher speed than ever, resulting in more output pergiventime’.

* With options, up lo 21 copies/min; 1:l (A4, landscape).

- ADF-Al for automatic document feed.

- Sorter-Al for automatic sorting and grouping (20 bins).

- MS-Al for automatic sorting and grouping (IObins).

- Control Card V (configured as built-in) for copy volume control (up to 200 depts.).

- Stapler Sorter 1 O-BI for stapling copies sorted in its ten bins.

COPYAIOHT D 1592 C A N O N I N C .

C A N O N NPZK?O/ZMO RN.1 OEC. 1992 PAINTEO IN JAPAN [ I M P R I M E AU JAPONI d

l-l

i.GENERAL DESCRIPTION

Pa. Type

Body

Copyboard

Light source

Lens

Photosensitive medium

Desktop

Fixed

Halogen lamp 1 OO/1 15V model 300W

220124OV model _._ 330W

Zoom lens

OPC

ES. Construction

Copying

Charging

Indirect static photocopying

Corona

Slit (moving light source) Exposure

Copy density adjustment Automatic (AE) or manual

Development

Pick-up Automatic

Dry

2 cassettes; multifeeder (NP2120)

Manual Manual feed tray (NP2020)

Transfer Corona

Curvature and Static eliminator Separation

Cleaning

Fixing

Blade

Heat roller (900 W)

1-2

COPYRIGHT 8 1992 C A N O N ING.

C A N O N NPZl20/2020 AN.I O E C . 1992 PAINTEO I N J A P A N IIMPAIME AU JAPONI

C. Performance

Document type

Jocument size (max.) qeproduction ratio

Nait time

?rst copy

:ontinuous copying

Zopy size

:~PY we Cassette

Manual feed tray

“;alc,,,

:assette

:opy tray don-image width

\uto clear mechanism iuto shut-off mechanism iuto starl

Sheet. Book, 3-D object (2 kg14.4 Ib max.)

A3 (297X420 mm)/LDG (1 l”X17”)

See Table l-1 ; 50% to 200%, zoom.

90 sec or less (20°C/680F)

9 sec or less

1 to 99 copies

A3/LDG (297 x 431.8 mm) max. (11 in x 17 in)

Postcard (100 x 148 mm) min. (3.9 in x 5.8 in)

Plain paper (64 to 80 g1m2), Tracing paper (SMI), Colored paper

Plain paper (64 to 128 g/m2), Tracing paper (SMI, GNT80’).

Colored paper, OHP film, Postcard, Label

* NP2020 only.

Plain paper (64 to 128 g/m’), Colored paper, OHP film

(overlay only), Postcard

Claws, Front loading; 250 sheets (approx.) of 80 g/m2

99 sheets (80 g/m2)

2.0 mmI0.08 in (leading edge), 2.5 mm/O.l in (left/right)

Provided. (2 min, standard; may be disabled)

Not provided.

NP2120 only.

Sorter-Al, MS-Al, Paper Deck Pedestal, Control Card V,

CT Unit, Stapler Sorter-BI, Stapler Sorter-62

COPYAIGHT 6 1992 C A N O N ING.

C A N O N NP2120/2020 REY.1 OEC. 1992 PAINTED I N J A P A N IIMPRIME AU JAPONI

l-3

- I.GENERALDESCRIPTION

B. Others

l-4

COPYRIGNT 0 1992 CANON INC.

C A N O N NPZl20/2MO NH.2 DEC. 1 9 9 2 PRINTEO I N J A P A N IIMPRIME AU JAPONI d

100/220/24OV

115v

220/240 V

DIRECT

1 : 1 (kO.5%)

1 : 1 (?0.5%)

1 : 1 @0.5%)

REDUCE

1 : 0.500 (kl .O%)

1 :0.700 (d.O%)

1 :0.816 (d.O%)

1 :0.865 (fl.O%)

1 :0.500(*1.0%)

1 :0.647 (il.O%)

1 :0.773 @l.O%)

1 :0.786(+1.0%)

1 :0.500 (*l.o%)

1 : 0.707(+1.0%)

Table I-l Fixed Reproduction Ratio

l.GENERALDESCRIPTION m

ENLARGE

1 : 1.154(+1.0%)

1 : 1.224(fl.O%)

1 : 1.414 (fl.O%)

1 :2.000 (kl.O%)

1 :1.214(+1.0%)

1 : 1.294(*1.0%)

1 :2.000 (*l.o%)

1 : 1.414 (kl.O%)

1 :2.000 (kl.O%)

Table l-2 Copy Speed

COPYNIGNT t? 1992 C A N O N I N C .

C A N O N NPZl20/ZMO NN. M A Y 1990 PRINTEO I N J A P A N IIMPNIME AU JAPON)

1-5

Table l-3 Paper Size

1 - 6 COPYAIGNT 0 1592 CANON INC.

C A N O N NPZl20/2020 R N . 0 M A Y 1990 PRINTEO I N J A P A N IIMPNIME AU JAPON]

l.GENERALDESCRIPTION

A. Externa1 View

NP2020

0 Copy tray

@ Copyboard cover

@ POWER switch

@ Delivery unit cover

NP21 20

0 Cassette

@ Copyboard glass

0 Control panel

Figure 1-l

NP2020 NP21 20

Fixing assembly knob

Drum unit

Delivery unit release lever

Developing assembly release lever

0

Developing assembly

c3

Registration knob (NP2120)

0

Multifeeder (NP2120)

Figure I-2

COPYNIGNT 0 1992 C A N O N I N C .

C A N O N NP2120/2020 NEV.1 DEC. 1992 PAINTM I N J A P A N IIMPRIME AU JAPONI

1 - 7

1,GENERALDESCRIPTION

5. Cross-Sectional View

1. NP2020

@ No. 3 mirror

@ No. 2 mirror

@ No. 1 mirror

@ Scanning lamp

@ Copyboard glass

@ Copyboard cover

Q Lens

@ Pre-exposure lamp

@ Primafy corona unit

@0 No. 6 mirror

Figure l-3

@I No. 5 mirror

@ No. 4 mirror

@ Manual feed pick-up roller

@ Manual feed tray

@ Vertical feed roller 1

@ Vertical feed roller 2

@I Cassette 1 pick-up roller

@ Cassette 2 pick-up roller

@ Registration roller

@ Transfer corona unit

@l Static eliminator

@ Photosensitive drum

8 Cassette 1

@ Cassette 2

0 Feeder unit

0 Ozone filter

@ Exhaust fan

8 Fixing unit

0 Delivery roller

1-8

COPYNIGNT f3 1592 C A N O N ING.

C A N O N NPZl2LVZMO AW.0 MAY 1990 PAINTED IN JAPAN IIMPRIME AU JAPUNI

2. NP2120

1. G E N E R A L D E S C R I P T I O N W

@ No. 3 mirror

Q No. 2 mirror

@ No. 1 mirror

@I Scanning lamp

@ Copyboard glass

@ Copyboard cover

Q Lens

@ Pre-exposure lamp

@ Primary corona unit

@9 No. 6 mirror

Figure l-3 a

@ No. 5 mirror

@ No. 4 mirror

@ Manual feed roller

@ Manual feed pick-up roller

@ Vertical feed roller 1

@ Vertical feed roller 2

0 Cassette 1 pick-up roller

@ Cassette 2 pick-up roller

@ Registration roller

@ Transfer corona unit

@ Static eliminator

@ Photosensitive drum

@ Cassette 1

@ Cassette 2

@ Feeder unit

@ Ozone filter

@ Exhaust fan

@ Fixing unit

@ Delivery roller

CWYRIGHT c 1932 C A N O N ING.

C A N O N NPZl20120’20 R N . 0 OK. l!X2 PRINNI I N J A P A N IIMPRIME AU JAPONI

l-8a

1 G E N E R A L D E S C R I P T I O N B

A. Control Panel

1. NP2020

AIBIINCH SIZE

A SIZE

Figure l-4

0 PAGE SEPARATION key

Press the key to select the page separation mode.

Q SORTIGROUP key

Press the key to select the SORTIGROUPINON-

SORT mode; when the indicator is OFF, the nonsort mode is selected.

@ FIXED RATIO indicator

@ JAM location indicator

@ JAM indicator

@ CONTROL CARD indicator

@ ADD TONER indicator

@ ADD PAPER indicator

@ AUTO RATIO key

Press the key to select the auto reproduction mode; effective only when an ADF is attached.

@ COPY COUNT indicator

- Apressonthe% keyindicatesthe reproduction ratio (%).

- The count decreases for each copy made.

0 % key

Holddownthe keytocheck the reproduction rabo shown on the COPY COUNT indicator; the indication goes OFF 2 sec after the key is released.

@I RESETkey

Press the key to return to the standard mode:

- C o p y c o u n t 1

- Ratio _......._...._.......................

DIRECT

- M o d e .._._..._..._.....................

* AE ._................._.....................

NON-SORT

OFF

COPYAIGNT % 1992 C A N O N I N C .

@ PRE-HEAT key

A press on the key in the standby mode activates the pre-heat mode.

- All LEDs except the PRE-HEAT indicator and

POWER indicator will go OFF.

- The fixing temperature will be controlled at

14O”C/284”F.

@ POWER switch

@ POWER indicator

The indicator remains ON when the POWER switch is ON.

@ TENKEY pad

0 CLEARISTOP k e y

Q COPY START key

- If red, no copy can be made.

- If green, copies may be made.

@ ZOOM key

Press the key to select the desired reproduction ratio between 50% and 200% in 1% increment.

@ CASSETTE SELECT key

@l FIXED ENLARGEMENT key

@ DIRECT key

@ FIXED REDUCE key

@ COPY DENSITY key

@ AE key (automatic exposure control)

C A N O N NP2l20/2MO REY.0 MAY 1990 PAINTEO IN JAPAN [IMPRIME AU JAPON] d

l-9

@ PAGE SEPARATION key

Press the key to select the page separation mode.

@ SORTIGROUPISTAPLE SORT key

Pressthekeytoselectthesort,group,StapleSOrt, or non-sort mode.

The copier is in the non-soti mode when the indicator is OFF.

@ FIXED RATIO indicator

@ JAM location indicator

@ JAM indicator

@ CONTROL CARD indicator

0 ADD TONER indicator

@ AUTO ZOOM key

Press the key to select the auto zoom feature.

@ COPY COUNT indicator

- indicates the ratio when the % key is pressed.

- incremented for each copy during copy operation.

@l % key

Hold down the key to change the COPY COUNT indicator notation from ratio to copy count.

Upon release, the notation is replaced by the copy count in 2 sec.

@ RESETkey

Press the key to return to the standard mode: copy count 1, DIRECT, non-so& AE (may be deactivated).

Figure l-4a

@ PREHEAT key

Pressthekeyduringthestandbyperiodtochoose the preheat mode.

* All LEDs except the PREHEAT and POWER indicators on the control panel go OFF.

@ POWER switch

@ POWER indicator

The indicator remains ON when the POWER switch is ON.

@ TENKEY pad

0 CLEAR/STOP k e y

@ COPY START key

- when itflashesgreen, youcannot makecopies.

- when it remains green, you can make copies.

- it remains red during copy operation.

@ ZOOM key

Press the keywhen selecting a reproduction ratio between 50% and 200% in lo/, increments.

@ CASSETTE SELECT key

@I ENLARGE key

@ DIRECT key

@ REDUCE key

@J COPY DENSITY key

@I AE key (automatic density adjustment)

l -9a

COPYRICNT 0 1592 C A N O N I N C .

CANON NPZl20/2MO NN.

OEC. 1592 PAINTEO IN JAPAN (IMPRIME AU JAPONI d

B. Making Copies

1) Tum the POWER switch ON

If the temperature of the fixing assembly is below the specified value,

. NP2020

The COPY START key remains red.

. NP2120

The COPY START key flashes green.

If the temperature of the fixing assembly is above the specified value, the COPY START key goes green.

The wait time is normally 90 sec (2O”C, average).

2) Openthecopyboardcover,andplaceadocument face down aligning ti with the size index.

3) Press the DIRECT, REDUCE, ENLARGE, or

ZOOM key for the desired copy size.

4) Press the AE key, and press the COPY DENSITY key as necessary if manual adjustment is desired.

5) Check the size of the cassette.

0 Replace the cassette if it does not contain paper of the desired size.

6) PresstheTENKEY padtosetthedesirednumber of copies (1 to 99), and check the COPY COUNT indicator.

0 Press the CLEARBTOP key 10 correct any mistake; set the copy count thereafter.

7) Press the COPY START key.

@ If the CLEARISTOP key is pressed in the continuous copy operation. the copier stops after it has completed the copy run.

@ The adjustment mode for density may be switched from automatic to manual between when the operation is started and when the last copy is completed; however, switching from manual to automatic is not possible during the period.

Note:

If the copy is too dar& or light in the AE mode, de- activate the AE mode, and make copies while varying the density using the COPY

DENSITY key.

@ If the ADD PAPER indicatorcomesONdur¡ng copy operation and the operation stops, add paper to the cassette; a press on the COPY

START key thereafter causes the copier to make the remaining number of copies.

@ IfanADFisattachedtothecopier.documents

placedonthetraywill beautomaticallypicked upandcopiedwhentheCOPY STARTkeyis pressed.

0 After each copy operation or a key operation, the copier returns to the standard mode ti left alone for about 2 min’.

‘Cannot be changed. but may be de-activated.

C. Using the Manual Feed Tray

(NP2020)

1) Set a document on the copyboard.

2) Press the DIRECT, REDUCE, ENLARGE, or

ZOOM key.

3) De-activate the AE mode, and adjust the density using the COPY DENSITY lever if manual adjustment is desired.

4) Feed a sheet of copy paper along the guides on the manual tray.

0 The copier automatically starts copying as soon as it detects the copy paper.

0 Make sure sheets are fed at intervals of 50 mm or more if in the continuous copy mode.

Note:

When the ADD PAPER indicator is ON, the

COPY READY indicator is red; manual feed operation, however, is still possible.

. Using the Manual Feed Tray

(NP21 20)

1) Set the document on the copyboard.

2) Open the manual feed tray.

3) Set the slide guide to suit the paper size.

Note:

Slide out the sub tray as necessaty to suit larger paper sizes.

4) Insert as many sheets as necessary along the guide until they stop; keep the face of the copy paper up.

E. Making Two-Sided Copies

Make sure that the copy is oriented the same way

(front and rear) for both first and second sides: keep the following in mind:

0 Check the paper is not moist or curled;

0 Check the paper is of 64 to 128 g/mZ;

l-10

COPYRIGNT % 1992 C A N O N I N C .

C A N O N NPZl20/ZMO RN.1 OEC. 1992 PAINTEO I N J A P A N IIMPAIME AU JAPONI

@ Do not process each side more than once; and

@ Do not use both overlay and two-sided copy modes on a single sheet of paper.

1. G E N E R A L D E S C R I P T I O N

Note:

1. Donottiltorshakethedevelopingassembly

or

CT

unit.

2. Do not place the developing assembly or

CT unit on the floor; rather, keep them in

storage boxes.

H. Using the COPY DENSITY

CORRECTION Lever

If the copies are always dark or light, slide the lever to obtain the desired density.

Figure l-5

F, Making Overlay Copies

Byreplacing thedeveloping assembly, thecopymay carry two colors; keep the following in mind:

0 Check the paper is of 64 to 128 glm’;

Q Do not process each side more than twice; and

@ Do not use both overlay and two-sided copy modes on a single sheet of paper.

G. Replacing the CT Unit

1) Open the front door.

2) Turn the developing assembly release lever counterclockwise.

3) Slide out the developing assembly to the front.

4) Hold the grip of the developing assembly, and lift the assembly slowly.

C O P Y D E N S I T Y

C O R R E C T I O N l e v

Figure 1-7 COPY DENSITY

CORRECTION Lever

Figure l-6

5) Place the CT unit on the developing assembly rail, and slide it in.

6) Turn the developing assembly lever clockwise.

7) Close the front door.

COPYAIGHT 0 1992 C A N O N ING.

C A N O N NPZl20/2MO REV.I O E C . 1592 PAINTED I N JAPAN (IMPAIME AU JAPONI

i-ll

WZ33 1,GENERALDESCRIPTION

1. Auto-Start (NP21 20)

The START indicator goes and remains red when you press the COPY START key during warm-up, and copy operation starts as soon as warm-up is completed.

You can press the COPY START key while the wire is being cleaned or during the jam wait period.

.

You still have access to the DENSITY key, AE key. RESETkey,orSTOPkeyafteractivatingthe auto-start mode.

To cancel the auto-starl mode, press the RESET or CLEAR/STOP key.

Note:

The autostart mode will automatically be canceled if the cassette has run out of paper, if the control card is not inserted, or if the right door of the cassette holder is open.

l-11 a COPYAIGHT 0 1992 C A N O N I N C .

C A N O N NPZl20/2MO R N . 0 WC. IB2 PRINTED I N J A P A N I M P R I M E AU JAPON)

KBld l.GENERALDESCRIPTION

A. JAM Indicator ( 8% )

If the indicator goes ON during copy operation, take the following steps; a jam is likely to have occurred at the location indicated.

Forjamsinanyoftheoptions(sorterorADF),see the respective service manual.

NP2020

J a m in ADFunit

Jam in copier

NP2120

Figure 1-8

Figure 1-9

5) Close the delivery unit cover.

6) Check if paper is jammed in the separation unit/ feeder unit; if paper is found, turn the feeder unit release lever counterclockwise to release the feeder unit.

Work with care.

Note:

When removing paper from the separation unit, take care not to touch the photosensitive drum.

J a m in A D F unit

Jam in copier

J a m in sorter

Figure 1-8 a

If the jam is in the copier, be sure to check the pickup unit, separation unit/feeder unit, fixing assembly/ delivery unit, and drum unit to remove all paper found.

1) Open the front door.

2) Remove the copies from the copy tray.

3) Pull the grip of the delivery unit to open the delivery unit cover.

4) Check if paper is jammed in the fixing assembly; if paper is found, turn the fixing assembly knob clockwise to remove it.

Figure 1-l 0

1-12

COPYNIGHT 0 1592 C A N O N I N C .

C A N O N NPZl2W'MO REV.1 OEC. 1 5 9 2 PAINTEO I N J A P A N IIMPRIME AU JAPON)

7) Open the right cover, and check if paper is jammed; remove the paper, if any.

Furiher, check that no paper is sticking out of the cassette.

1. Using the Multifeeder Tray (NP2120)

Lift the lever, and pull out the jam, taking care not to tear the paper.

\

Right cover

Figure l-ll

Figure l-12a

B. ADD PAPER Indicator ( & )

The indicator goes ON if no cassette is in the cassette holder or the cassette has no paper.

1) Slide out the cassette to the front of the copier.

2) Put paper in the cassette.

3) Slide the cassette back into the copier.

Figure 1-lla

8) Close the right door, and then the front door

COPYAIGNT 0 1992 C A N O N ING.

C A N O N NPZlZO/ZG70 NEW.0 DEC. 1592 PRINlID IN JAPAN IIMPRIME AU JAPON)

l-12a

C. ADD TONER Indicator ( h )

The indicator goes ON when the black developing assembly is running out of toner.

1. Black Developing Assembly

1) Open the front door.

2) Turn the black developing assembly lever counterclockwise.

3)

4)

5)

6)

7)

Pull the black developing assembly to the front until it stops.

Open thetoplidofthe blackdeveloping assembly.

Shake the toner cartridge side to side about ten times.

Placethetonercartridgeontheblackdeveloping assembly.

Hold the toner cartridge, and pull the seal to the front until a resistance is felt.

2. CT Unit (mono color developing unit)

If the image seems too light in parts of a mono color copy, the CT unit is likely to be running out of mono colortoner; replace the unit if this happens. If the CT unit is placed in the protection box and shaken, the problem may be corrected temporarily.

Note:

The CTunit isof adisposabletype;donot add toner. but use a new unit.

D. CONTROL CARD Indicator

Gs)

The indicator flashes in response to the following conditions while the control card is in the copier.

1

2

The control card is not properly inserted into the control card unit.

The control card unit indicates ‘P’ or ‘EE’ even when the control card is properly inserted into the control card unit.

E. @ @ Indìcator

Any of the foilowing goes ON if a document is left behind, the sorter is detached. or the right door is open.

Figure 1-12

8) Tap the topofthetonercartridgeso that all toner remaininginthecartridgefalls intothedeveloping assembly.

9)

Detach the toner cartridge with care.

10) Closethetoplidoftheblackdevelopingassembly.

11) Slide the black developing assembly into the copier.

12) Turn the developing assembly release lever clockwise.

13) Close the front door.

NP2020

NP21 20

@ Document is left behind.

Q Sorter is detached.

@ Right door is open.

COPYAIGHT 0 1 9 3 2 CMGH INC.

CAGGG Wl20/2MO RN.1 DIC. 1992 PRINTEG IN J A P A N IIMPGIME AU JAPONI

1-13

Advise the user to clean the following once a week without fail:

1) Primary Corona Wire

Slide in and out the cleaning wire to clean it.

2) Copyboard Glass

Wipe it using a moist cloth; thereafter, wipe it using a dry cloth.

3) Copyboard Cover

Wipe it using a mild detergent solution; thereafter.

wipe it using a dry cloth.

4) Static Eliminator

Clean the static eliminator using the cleaning brush (accessory).

If separation jams occur frequently, clean the static eliminator using the cleaning brush

(accessory) as necessary.

1-14

C O P Y A I G N T Q 1992 CANON INC.

C A N O N NPZlZO/ZGZl RN.1 JAN. 1992 PRINTEG IN JAPAN [IMPRIME AU JAPONI

CHAPTER 2

COPYING PROCESS

1.

IMAGE FORMATION PROCESS . ...<....

2-1

COPYGIGNT 0 1992 CANOH ING.

II.

AUXILIARY PROCESSES . . . . . . . . ..__.._..___

CANOH NPZl20/2tVl AEV.0 MAY 1990 PRINTEO I N J A P A N [ I M P R I M E AU JAPON)

2-6

I ,I

C o p y b o a r d glass

, j “‘y> Scanning lamp

(

Lower fixing roller

Sfatic eliminator

Transfer corona unit

1, See Figure 2-l for the construction of the copier

Images are formed in the following eight steps:

Step 1 Pre-conditioning exposure

Step 2 Primary corona exposure (negative DC)

Step 3 Image exposure

Figure 2-1

Step 4 Development (AC and negative DC)

Step 5 Transfer corona exposure (negative DC)

Step 6 Separation

Step 7 Fixing

Step 8 Drum cleaning

COPYRIGHT 0 1992 C A N O N I N C .

C A N O N NPZl20/2020 AEV.0 M A Y 1990 PRINTEO IN JAPAN IIMPAIME AU JAPONI 2-l

I

F o r m a t i o n o f Electrostatfc Latent I m a g e Separation

I

r - - - - -

- - - - - - - - - - - - --------_ 1

3.

I m a g e e x p o s u r e

I

I

J

I

/

1. P r e - c o n d i t i o n i n g e x p o s u r e r--

L-----+-------J

4 . Development

8 . D r u m cleaning

5 . Transfer c o r o n a exposure M a n u a l f e e d tray

Delivery

R

Registration ti

>(

6. separaion

L9

7 . Fixing

CFiSSt3te

CXSWk

0 Flow o f copy paper c Rotation o f d r u m

Figure 2-2

The photosensitive drum is of a two-layer construction; its outer layer is made of organic photoconductor (OPC), and the inner layer is an aluminum base made of conducting material.

Photoconductlng Iayer

T i m e (1) -

F O s g

L lz

å ‘/

L?!

- 5 0 0 -

/

/

I/

, r-- - - -

T

Light area

P r e - c o n d i t i o n i n g P r i m a r y c o r o n a

(step 1 ) (step 2 )

I

I

\

D a r k area

I m a g e e x p o s u r e (step 3)

Figure 2-3

2. Formation of Electrostatrc Latent Image

This block consists of the first three steps of the image formation process; at its end, the areas of the drum corresponding to dark areas of the document areleftwith negativecharges, andthoserepresenting light areas are rid of negative charges.

The pattern of charges so formed is not visible to the human eyeand, therefore, iscalled an electrostatic latent image.

Figure 2-4

3. Step 1 Pre-conditionrng exposure

Figure 2-5

2-2

COPYAIGHT 0 1992 CANON ING.

C A N O N NP2120/2MO R N . 0 M A Y 1990 PRINTEO I N J A P A N IIMPAIME AU JAPONI I

Inthisstep,orpre-conditioningexposure,thesurface of the drum is exposed to light from the preconditioning exposure lamp. All charges remaining on the surface of the drum from the preceding copy cycle are eliminated in preparation for exposure by theprimarycorona. Suchcharges, if leftastheyare, could result in copies with uneven density.

4. Step 2 Primary corona exposure

6. Step 4 Development

,Blade

C O P Y I N G P R O C E S S K#ZW

Developing cylinder

Figure 2-6

In this step, the drum is exposed by the primaiy corona. As a result, its surface will cometo have a uniform layer of negative charges and maintain primary potential.

The surface potential of the drum is determined by the value of the grid bias’grounded by way of a constant voltage element.

5. Step3 Image exposure

Figure 2-8

As shown in Figure 2-8, the developing assembly consists of a developing cylinder and a magnetic blade; the developing cylinder itself is made up of a magnet fixed in position and acylinder which rotates around the magnet.

The black developer is a single-component developer of magnetite and resin. The developer has insulating properties and is charged to a positive potential by friction with the rotating cylinder.

The color developer is a fixed-ratio mixture of carrier (iron powder) and toner (resin).

By friction with the rotating cylinder, the iron powder is charged to a negative potential, and the toner to a positive potential.

Opwal i m a g e

,l I 1

Dark_area 1 Lightarea

Magnet Magna

COPYRIGHT 0 1992 CANON INC.

Figure 2-7

In this step, the optical image of the document is projectedonthesurfaceofthedrumtoneutralizethe charges in light areas.

Figure 2-9

Aconcentrated magneticfield develops between the magnet and the tip ofthe blade, and the developer is attracted to the magnetic field.

The magnetic field holds the developer it has attracted virtually immobile and creates a collection of developer particles hanging from the tip of the blade. Asthecylinderrotates, thedeveloperparticles leavethe magneticfieldtodepositthemselvesonthe cylinder in a thin, uniform layer.

Since both thedeveloping cylinder and blade are given AC bias and DC bias (negative component) at the same time, the resulting waveform of the developing bias has a larger negative component than positive.

C A N O N NPZl20/2MO REY.0 MAY 1990 PAINTEO IN JAPAN [IMPRIME AU JAPONI 2 - 3

8. Step 6 Separation

D C bias

Figure 2-10

During copy operation, the toner is attracted to the drum by the work of the surface potential of the drum as well as the developing bias (at time of positive component), and it turns the electrostatic latent image to a visible image. The excess toner is repelled by the surface potential ofthe drum and the developing bias (at time of negative component).

A DC bias affects copydensity; a larger bias, Le., approaching OV, increases the density but, at the same time, tends to cause fogging.

7 Step 5 Transfer

Transfer c o r o n a mi!

L-r-

4

Figure 2-11

In this step, a negative corona is applied to the back of the copy paper so as to attract the positively charged toner to the paper.

\ Static eliminator

Figure 2-12

In this step, the paper is separated from the drum making use of the rigidity of the copy paper. Thin paper, with little rigidity, however, tends to remain in contact with the drum; to prevent such a condition, the static eliminator is charged to a positive potential to facilitate separation by weakening the static attraction between the drum and copy paper.

9. Step7 Fixing

, Oil application roller

F-4

, upper lixing roller

Halogen heater

Figure 2-13

In this step, the paper carrying a transfer image moves between two heated rollers, and the transfer image is fixed to the paper.

To prevent jams and toner offset, the upper roller remains in contact with the oil application roller impregnated with silicone oil.

COPYAIOHT 6 1992 C A N O N I N C .

C A N O N NP2120/2MO RN.0 MAY 1990 PRINTEO IN JAPAN [IMPRIME AU JAPON) 2 - 4

10. Step 8 Drum cleaning

Cleaning b l a d e

Blade

\

Scoop-up s h e e t

Figure 2-14

In this step, the toner remaining on the drum surface is scrapedoff by thecleaning blade and collected by the scoop-up sheet in preparation of the next copy cycle. The toner is then moved aside by the blade.

COPYAIGNT Q 1592 CANON INC.

C A H O N NPZl20/2MO KV.0 M A Y 1540 PAINTEO IN JAPAN IIMPRIME AU JAPOH,

2-5

FZB3COPYlNGPROCESS

A. Blank Exposure Mechanism

The blank exposure mechanism is used to remove the potential from the non-image sections of the drum in the REDUCTION mode or lo suit paper sizes; see p. 3-37.

The light from the pre-exposure lamp is reflected by the reflecting plate and directed onto the photosensitive drum.

The non-image section between two sheets of copy paper is kept free of toner by lowering the grid bias of the primary corona unit, instead of using the blank exposure mechanism to remove the potential of the drum.

B. Ozone Filter

The fan unit is equipped with an ozone filter, which breaks down the ozone generated by the coronas into oxygen by catalytic action.

2 - 6 COPYAIGHT 0 1592 C A N O N ING.

C A N O N NPZlZO/ZMO R N . 0 MAY 1990 PAINTEO I N J A P A N IIMPRIME AU JAPONI

CHAPTER 3

OPERATIONS AND TIMING

Inoutlinediagrams,-- representsmechanícaldrivepaths,andmindicateselectricalsignal paths.

Signals in digital circuits are identified as ‘1’ for High and ‘0’ for Low. The voltage of signals, however, depends on the circuit.

Nearly all operations of the copier are controlled by microprocessors; the interna1 workings of these processors are not relevant to the serviceman’s work and, therefore, left out of the discussions. By the same token, no repairs are prescribed for the PCBs at the user’s premises; for this reason, PCBs are discussed by means of block diagrams rather than circuit diagrams.

Forthe purpose of explanation, discussions are divided into the following: from sensors to DC controllerPCBinputports;fromDCcontrolleroutputportstoloads;andminorcontrolcircuitsand functions.

1.

II.

BASIC MECHANISMS..........................

3-1

EXPOSURE SYSTEM .......................... 3-13

III.

IMAGE FORMATION SYSTEM ............ 3-24

IV.

PICK-UP/FEED SYSTEM .................... 3-39

COPYRIGHT 0 1992 C A N O N ING.

V.

POWER SUPPLY ................................. 3-52

VI.

SERVICE

MODES

................................ 3-55

VII. SELF DIAGNOSTIC MECHANISM.. ..... 3-57

C A N O N HPZl20/2GZO RN.0 MAY 1990 PAINTEU IN JAPAN [IMPRIME AU JAPON]

O P E R A T I O N S A N D TIMING EXE&3

14. Functional Construction

The copier can be divided into four functional blocks; pick-up/feed system, exposure system, image formation system, and control system.

-

-

-

-

-

-

- A

-

\

\

\

Pi&uplfeed s y s t e m

---- 1

\

\

.\

\

Figure 3-1

---- -l

COPYAIGHT 0 1992 UINON I N C .

C A N O N NPZl20/2lVO AEV.tl MAY 1590 PRINTED I N JAPAN IIMPAIME AU JAPONI

3 - 1

B. Electrical Circuitry

The copier is controlled by the two microprocessors and communication LSI on the DC controller PCB, each of which functions as follows:

1 Microprocessors 1

Q301 (master)

. Controls the copy sequence.

. Controls the document size identification.

Q302 (slave)

. Controls the stepping motor.

. Outputs the image formation control signals.

Q304 (IPC)

. Controls the serial communication with ADF and sorter.

Note:

With the built-in A/D converter, the copie& microprocessors can read both digital and analog signals.

Note:

The main motor (Mi) is a synchronous motor thatusesthefrequencyofthepowersupplyas referente. The scanner motor (M2) and lens motor (M3), on the other hand, are stepping motors that use the oscillation frequency of the crystal oscillator built in the DC controller.

As such, luctuations in the power supply frequency during copy operation in turn fluctuate the main motor (MI), causing the copies to carry expanded or contracted images.

3-2

COPYAIGHT 0 1992 C A N O N I N C .

C A N O N NPZl20/2MO RN.0 M A Y 1990 PAINTEO I N J A P A N IIMPAIME AU JAPONI

D C controller PCS

. Lens h o m e p o s i t i o n

SO”501 f Blank shutter h o m e position se”sor

* Scanner h e m e postian se”sor

* Cleaning unit h o m e positlon s e n s o r

. T h e mistar

. AE s e n s o r

. S S R ON signa1

( N P 2 1 2 0 )

l

* Pre-registraion p a p e se”sor

. separation p a p e r

r

Se”SOr

. Delivery s e n s o r

* C a s s e t t e p a p e r s e n s o r

’ M a n u a l f e e d t r a y lxwer semor

’ ioner level s e n s o r

. C o p y b o a r d cover

S?“SLX

’ R i g h t door s e n s o r

’ Document size s e n s o r

Density correction lW3

:

Microprocessor

Microprocessor

(CO0 1; master)

- L a m p regulator

-l

Sorier. A D F

Papa d e c k p e d e s t a l i

. Feed c l u t c h

. Pickup c l u t c h solenoid

* Cel application solenold

* T o t a copy counter

* Multileeder solenoid (NP21 2 0 ,

* Pre-exposure lamp

* F e e d e r fan

. Exhaust fan

Figure 3-2

COPYAIGNT 0 1932 C A N O N ING.

C A N O N NPZIZO/ZMO REY.1 O E C . 1992 PRINlEO I N J A P A N IIMPRIME AU JAPON)

3-3

EZI O P E R A T I O N S A N D TIMING

C. Inputs to DC Controller

Inputs to DC Controller (1/4)

Lens h o m e p o s i t i o n sensor

Blank s h u t t e r h o m e

1

92

Pre-registration p a p e r s e n s o r

Scanner h o m e p o s i t i o n se”sor c a s s e t t e 1 paper s e n s o r

C a s s e t t e 2 paper s e n s o r

M a n u a l f e e d papel s e n s o r

Black tener level l

I

r

se”sor

I

I

I

L

C o p y b o a r d cover switch 1

C o p y b a a r d cover switch 2

0 ’

I s w 4

I

0

I-

DCcontroller P C B

5311-7 t5v

<

-6 ’ LHP W h e n lens is a t h o m e p o s i t i o n , ‘ 1 ’ .

(flag is a t Ql)

5 v

1

W h e n b l a n k s h u t t e r is at home position,

‘1’.

(llag at 02)

W h e n p a p e r is present. ‘1’.

(flag is a t cl3)

W h e n scanner is at h o m e p o s i t i o n . ‘ 1 ’ .

(llag at 04)

W h e n p a p e r is present. ‘0’.

(flag is not a t 05)

W h e n p a p e r is a b s e n t in “pper cassette, ‘0’.

(flag is not a t c)7)

-8 1

W h e n papa is a b s e n t in lower c a s s e t t e . ‘0’.

(flag is not a t Q7)

W h e n copy p a p e r is p r e s e n t , ‘1’.

(flag is a t 03)

W h e n b l a c k tener in b l a c k d e v e l o p i n g a s s e m b l y is below specified value, ‘0’.

W h e n c o l o r d e v e l o p i n g a s s e m b l y is s e t .

‘ 1 ’ .

W h e n c o p y b o a r d cover is m o v e d down to about 2 0 d e g . , ‘ 0 ’ .

(staris 1 st document identification)

5306X0! CBC,-~

- 1 1 I

W h e n c o p y b o a r d cover is m o v e d down to about5 d e g . , ‘ 0 ’ .

(starts 2 n d Qcument identification; about

1 sec thereafter)

3-4

COPYRIGHT 0 1992 CANON I N C .

Figure 3-3

C A N O N NP2f2012020 R N . 0 M A Y 1990 PAINTEO I N JAPAN IIMPAIME AU JAPON)

Inputs to DC Controller (2/4)

wire cleaner nome position switch sw6

0 ,

1 wfre clearw rear position switch sw9

0 ,

I

SIN7

Righ! door switch

Delivery sensor

Cassette 2 size identification

DCcontroller PC8

5309-3 ‘W,CHP

-4 I w h e n transfer c o r o n a wire cleaner is a t h o m e p o s i t i o n (front), ‘0’.

5309-5 I eWCRP

-6 ’

4

5318-10

Q RDC

- 1 1 ’ w h e n transfer c o r o n a wire cfeaner is a t rear, ‘0’.

Wh?n right door is opa, ‘1’.

W h e n paper is present, ‘1’.

( w h e n permanent magnet on papa detection lever is away)

Clock signa1

Cfock signa1 l

Reads the c a s s e t t e size; see p . 3 - 4 3 .

c a s s e t t e 1 size identification

Thermistor

I

T H

1

I

5313-9

+TH

I

Voltage fowers w h e n fixing rolfer temperahlre rises; analog signal.

Scanning lamp intensity varies; corrects d e n s i t y if copy d e n s i t y is toa dark or light.

C o p y d e n s i t y

correction ,ever

COPYRIGHT 0 1592 C A N O N I H C .

Figure 3-4

CANON NPZf20/2MO RN.0 M A Y 1590 PRIIITED IH J A P A N ( I M P R I M E AU JAPOfff 3-5

5!Z# O P E R A T I O N S A N D T I M I N G

Inputs to DC Controller (314)

-

D C controller P C B

-

3-6

W h e n ‘o’, L E D O goes ON: w h e n d o c u m e n t is p r e s e n t , ‘0’.

(output)

W h e n ‘ 0 ’ , L E D O goes ON; w h e n d o c u m e n t is p r e s e n t , ‘0’.

(output)

W h e n ‘o’, L E D O goes ON; w h e n d o c u m e n t is p r e s e n t , ‘0’.

(output)

W h e n ‘0’. L E D O goes ON: when d o c u m e n t is present, $0’.

W h e n S S R is ON, ‘1’

To P . 3-3

F i g u r e 3 - 5

COPYAIGHT 8 1Y32 CANOH ING.

C A N O N HPZtZO/ZMO REY.1 O E C . 1992 PAINTEO IH JAPAN IIMPAIME AU JAPONI

Inputs to DC Controller (4/4)

Adjusting P C B f - - - - - - - - - - - - - 1

1551

1 r l

I

I l-2

1-3

I

I

I

I

I

I

I

I

1-4

DCcontroller PCS

5312

- 1 2

- 1 1 1

I j

-10

-a

- 9

< i

I

5 v

V R 5 : a d j u s t s i m a g e l e a d i n g e d g e registration (turn c l o c k w i s e to delay registration clutch ON timing for larger margin).

V R 3 : a d j u s t s i m a g e l e a d i n g e d g e nonf m a g e w f d t h (turn clockwise to delay grid bias ON timing for larger n o n - i m a g e w i d t h ) .

V R 4 : a d j u s t s p a g e separation 2 n d p a g e l e a d i n g e d g e n o n - f m a g e w i d t h (tun c l o c k w i s e to delay glrd bias ON timing for larger non-image width).

V R 2 : a d j u s t s AE slope (in service m o d e ) .

VRl: a d j u s t s AE referente p o i n t (in service m o d e ) .

SWl: service switch

RI : wl?en cut, AE r e m o v e d f r o m s t a n d a r d m o d e .

R 2 : w h e n cut. document size identiflcation d i s a b l e d .

R 3 : w h e n cut, a u t o clear d i s a b l e d .

For details on adjustment for each VR, see the SERVICE HANDBOOK.

Figure 3-6

COPYRIGNT 0 1992 CAHON IHC.

C A N O N NPZf20/2MO R E Y . 0 MAY 1990 PAINTEO I N JAPAN IIMPAIME AU JAPON)

3-7

D. Outputs from DC Controller

Outputs from DC Controller (113)

D C conuoller P C B

W h e n ‘ 0 ’ , RLI goes O F F : sae p . 3 . 4 7 .

W h e n ‘i’, fixing heater goes ON.

ming l a m p

See D. 3-26.

3-8

Main motor

Scanner cooling fan

When ‘70’. main motor and scanner c o o l i n g fan go ON.

D C power supply P C B

COPYAIGHT G 1592 C A N O N ING.

Figure 3-7

C A N O N NPZf20/2020 AN.I O E C . 1992 PAINTEO I N JAPAN IIMPRIME AU JAPONI d

O P E R A T I O N S A N D T I M I N G

Outputs from DC Controller (2/3)

F e e d e r roller c l u t c h 1

Multifeeder clutch

( N P 2 1 2 0 only)

C a s s e t t e 1 pi&up clutch solenoid c a s s e t t e 2 pick-up c l u t c h s o l e n o i d

Oil application s o l e n o i d

Blank switch s o l e n o i d

Multifeeder solenoid

(NP2120 only)

SL5

F e e d e r fan

Exhaust fan

D C controller P C B

.__

W h e n ‘0’. C L 1 goes ON.

k’h?n ‘ 0 ’ , C L 2 goes ON.

When ‘ 0 ’ . C L 3 goes ON.

W h e n ‘0’. C L 4 goes ON.

-4 ‘mi7

W h e n ‘ 0 ’ , SLI goes ON.

W h e n ‘0’. SLZ goes ON.

W h e n ‘0’. S L 3 goes ON.

W h e n ‘0’. S L 4 goes ON.

W h e n ‘U, S L 5 goes ON

W h e n ‘o’, F M 2 goes ON.

W h e n ‘ 0 ’ , F M 3 goes ON.

W h e n ‘ O ’ , p r e - e x p o s u r e l a m p goes ON.

pre-exposure l a m p

COPYRIGHT @ 1932 C A N O N ING.

Figure 3-8

C A N O N NPZl20/ZMO RN.1 DEC. 1592 PAINTEO I N J A P A N IIMPRIME AU JAPON]

3-9

8% O P E R A T I O N S A N D T I M I N G

Outputs from DC Controller (3/3)

M o t o r driver P C S !

D C controller

Cleaning motor

S e e p 3-18.

See p . 3-l 7

See p. 3.38.

C o n t r o l Card V c c v r

,“35y ; i i

55047 -

2

-2 ’

- 4 I Con1rol

-3 plel

PCS

-II

I

I

-14lp

i 7JJ

W h e n ‘0’. t o t a l copy counter goes ON

W h e n ‘0’. multifeeder present L E D goes ON.

( N P 2 1 2 0 only)

W h e n ‘0’. ON.

W h e n ‘0’. card present.

Figure 3-9

3-l 0

cOPYRIGHT 0 1992 CANON INC.

C A N O N NPZl20/2MO RN.2 DEC. 1992 PAlNITO IN JAPAN [IMPRIME AU JAPONI

E. Basic Sequence

165W329’F 17OW338”F

O P E R A T I O N S A N D T I M I N G N

Figure 3-10

N o t e : V a l u e in p a r e n t h e s e s indicatetemperature w h e n C T unit is in “ s e .

WMUP

(warm-up)

WMUPR

(warm-up rotation)

Period Description Remarks

Between when the power is Waits until the fixing roller The warm-up time varies switched ON and when the is heated.

depending on the fixing fixing roller is heated lo 165’0

329”F(145”C/293”F).

roller temperature.

Between when the fixing roller Stabilizes the fixing roller is heated to 165%/329”F t e m p e r a t u r e .

(145”C/293”F) and to 17O”C/

338°F (150°C/3020F).

INTR (initial rotation)

AER (AE measurement)

B e t w e e n w h e n t h e C O P Y S t a b i l i z e s t h e d r u m

START key is pressed and sensitivityinpreparationfor when the scanner starts to copyoperation.

move forward.

Between when the scanner is Measuresthedensityofthe Theoperationappliestothe moved forward about 70 mm/ document by moving the the AE mode only.

2.8 in from the document scanner about 70 mm/2.8

leading edge and when it is in forward and in reverse.

returned to the home position.

SCFW (scanner While the scanner is moving The scanning lamp illumi- The registration signa1 is forward) forward.

nates the document, and generatedtomovethecopy

- The length of forward travel thereflectedlightisdirected paper to the transfer unit.

varies according to the cas onto the photosensitive sette size and reproduction drum by way of mirrors and lens.

ratio.

* The speed of forward travel varies according to the reproduction ratio.

Note: Values in parentheses indicate the temperature when the CT unit is in use

Table 3-la

COPYRIGHT 0 1992 C A N O N I N C .

C A N O N NPZlZO/ZMO R N . 0 MAY 1990 PAINTIO I N J A P A N IIMPAIME A,, JAPON,

3-11

Period Description

SCRV (scanner Whilethescanner is moving in Returns the scanner to the in reverse) reverse.

home position in preparation for the next copy.

LSTR

(last rotation)

Remarks

FromwhenSCRViscompleted Cleans the drum surface The last copy is delivered.

until the main motorstops after electrostatically.

thecopypaperhasmovedpast the delivery sensor.

STBY (standby) FromwhenLSTRiscompleted Waits for a press on the until theCOPY STARTkey is C O P Y S T A R T k e y o r pressed or power is switched operation keys.

OFF.

3 - 1 2 COPYAIGHT 0 1992 CANON IX.

CAWOW HPZl2012CQ0 AN. MAY 1 9 9 0 PAIHTFII I A J A P A N ( I M P R I M E AU JAPONI

A. Varying the Reproduction

Ratio

DIRECT -?F-

The reproduction ratio across the drum (axial) is varied by the lens drive system and that around the drum(circumferential), bythescannerdrivesystem.

The lens drive system contains a zoom lens and, as shown in Figure 3-11, the position of the lens and the focal distance are shifted to vary the reproduction ratio across the drum.

ThescannerdrivesystemmovestheNo.1 mirror faster in relation to the drum rotation for reduced copies or slower for enlarged copies.

REDUCE B

ENLARGE m&

Note:

When in the DIRECT mode, the speed of the

No. 1 mirror and that of the drum rotation are identical.

Figure 3-11

COPYRIGHT 0 1992 CARON IHC.

C A N O N NPZlZO/ZMO R N . 0 MAY 1990 PAIRTEC I N JAPAN [ I M P R I M E AU JAPOIII

3-13

O P E R A T I O N S A N D T I M I N G

B. Lens Drive System

1.

Outline

The lens unit is driven by the lens drive motor

(M3).

The lens drive motor also serves to move the blank exposure shutter and is switched by the blank shutter solenoid (SL4); see p. 3-37. When the blank shutter solenoid (SL4) goes ON, the drive is transmitted to the lens drive pulley to move the lens unit.

WhenthepowerisswitchedON, SL4goesON to rotate the lens drive motor, thereby moving the lens to the home position. When the lens reaches the home position, the lens drive motor rotates in reverse; it then stops after the signa1 plate has left the sensor (Qi) and a specific number of pulses has been generated, positioning the lens at the DIRECT position.

Likewise, the lens is first moved to the home position also for both enlargement and reduction operations; it is then moved and positioned at a point suited to the specified reproduction ratio.

Lens drive motor

Blank shutter d

B l a n k shuner

Figure 3-12

3 - l 4

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E N L A R G E M E N T

B l a n k shutter solenoid (SL4) \ r l

Lens drive pulley

O P E R A T I O N S A N D T I M I N G M

Lens drive m o t o r

B l a n k shutter drive

Figure 3-13 Lens Drive System (viewed from above)

COPYAIGHT 0 1992 CANON IWC.

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3-15

O P E R A T I O N S A N D T I M I N G

2. Basic Sequence for Lens Drive System (reduction)

C O P Y S T A R T k e y ON P O W E R s w i t c h ON

’ WMUP ‘P==F

D I R E C T

I I

Lens drive m o t o r ( M 3 ) t

B l a n k shulter solenoid ( S L 4 )

Lens h o m e position s e n s o r (Qí)

Blank shutter home position sensor w c

L

@ Sets the lens at the DIRECT position.

0 Sets the blank shutter at the home position.

@ Sets the lens at a point suited to the specified reproduction ratio.

@ Moves the blank exposure shutter for blank exposure (rear) to suit the specified reduction ratio.

Figure 3-14

The copier’s blank exposure shutter is designed to move according to the specified copy size; as such, the shutter moves also in the DIRECT mode.

3-16

COPYAIGHT Q 1932 C A N O N IHC.

C A N O N NPZ,ZO/ZMO R N . 0 M A Y 1590 PAIHTEO I N JAPAH IIMPRIME AU JAPONI

3.

Lens Drive Motor Circuit

The lens drive motor is a stepping motor and rotatesin responsetothedrivepowersignal(LNSTB) and pulse signals (LNA. LNA, LNB, LNB).

O P E R A T I O N S ANO TIMING RSSZ

Tostartthelensdrivemotor, LNSTBgoes’l’; and the motor is rotated by applying pulses on each phase in sequence.

When the lens drive motor is at rest, LNSTB is ‘0’; the motor is supplied with current by way of R418 so as to hold the lens in place.

5 3 0 8 5 4 0 1 ! ,k i”“‘” 1

-1 B I I

1

~.

D C controller P C B

-12 LNA -3’

M o t o r driver P C B

Figure 3-15

Lens drive m o t o r

COPYRIGHT 0 1992 C A N O N I H C .

C A N O N HPZ120/ZMO R N . 0 MAY 1990 PAINTEO I N JAPAN IIMPRIME AU JAPOHI

3-17

C. Scanner Drive System

1. Outline

Thescannerisdrivenbythescannermotor(M2).

The scanner motor changes its direction of rotation to move the scanner forward and in reverse. When the scanner moves forward, the motor speed is changed to suit the specified reproduction ratio; when the scanner mover in reverse, however, its speed is constant regardless of the reproduction ratio (3.5 times as fast as when moving forward).

The distance over which the scanner moves varies according to the length of the copy paper and the reproduction ratio.

No. 2 mirror mount

S c a n n e r h o m e

N o . 1 m i r r o r mount

3-l 8

M o t o r driver P C B

n

Scanner motor

drive signa1

D C controller PCE

Figure 3-16

COPYAIGHT 0 1992 C A N O N I N C .

C A N O N NP2Wl12MO R N . 0 M A Y 1990 PAINTEO I N JAPAN IIMPAIME AU JAPONI

2. Relationship Between Sensor and Signals

Scanner sensor Signa1

Scanner

Forward In reverse

Scanner home position SCHP -L

Description

- Registration clutch ON

- Grid high voltage output ON

* Scanner reverse OFF (0.1 sec later)

Table 3-2

3. Basic Sequence for Scanner (ENLARGE/REDUCE)

POWER switch ON COPY START key ON COPY START key ON

Figure 3-17

COPYRIGNT @ 1992 C A N O N ING.

C A N O N NPZl20/2CQO AB.0 M A Y 1590 PAINTEO I N JAPAN IIMPRIME AU JAPON,

3-19

4. fblovement of Scanner in Page Separation Mode (2 documents)

D o c u m e n t l e a d i n g e d g e o f Istpage

D o c u m e n t l e a d i n g e d g e o f Istpage

D o c u m e n t l e a d i n g

D o c u m e n t l e a d i n g e d g e o f istpage e d g e o f I s t p a g e D o c u m e n t l e a d i n g D o c u m e n t l e a d i n g

Forward.i-kForward

Reverse i--i-Fo¡ward+-&Fonvard&=

R e v e r s e R e v e r s e

Figure 3-18

1, ll, and III shown in Figure 3-18 are controlled with referente to the document leading edge (falling edge of 04) of the first page.

1: The distance over which the scanner moves from the document leading edge is determined by the reproduction ratio and cassette size as in the normal copy mode.

II: It is more or less identical to 1; however, if the distance over which the scanner moves forward is longer than 210 mm/8.3 in (115/220/24OV models), 210 mmB.3 in (216 mm/85 in) will be identifiedas thereferencetothedocument leading edge.

Ifthedistanceisshorterthan2lOmm/8.3in(216 mm18.5 in), the point at which the scanner reverses will be identified as the document leading edge of the second page.

III: Same as 1.

Note:

The distance over which the scanner moves cannot exceed 432 mm/1 7 in from the document leading edge (the point reached by the scanner having moved forward 10 mm/0.4 in from the falling edge of Q4); further, the distance is limited by the specified reproduction ratio.

In the case of enlargement by 200%, the distance is 216 mm18.5 in max.

3-20

COPYAIGNT 0 1992 C A N O N ING.

C A N O N NPZlZO/ZMO RN.0 MAT 1590 PAINTEO I N J A P A N IIMPRIME AU JAPONI

D. Document Sìze Identification

1. Outline

The copier is equipped with auto paper selection and auto reproduction ratio selection mechanisms.

These mechanisms call for identification of the document size as described below.

To enable such identification, three circuits are attached under the copyboard glass (Figure 3-21); when the copyboard cover is lowered, the DC controller checks the output of these circuits twice, thereby identifying the document as Ledger, Legal,

Letter, or Mini.

C o p y b o a r d cow?

OPERATIONS AND TIMING m

The document identification circuit causes its

LED to emit light to illuminate the document; the reflected light is then checked by the phototransistor, whose output is sent to the DC controller.

2. Mechanism

The DC controller checks the output of the document identification circuit when the copyboard cover is lowered to about 20 deg. (SW4 ON) and about 1 sec second afterthe over has been lowered to about

5 deg. (SW5 ON).

The DC controller recognized the presente of a document if the two measurements are identical: conversely, it recognizes the absence of a document if the measurements are different.

1 [ DCcontroller PCB /

D C conlroller P C B

(The thickness of the arrows represents the degree of the level.)

Figure 3-19

When a document is present, the light reflected by the document is checked by the document identification circuit; therefore, the output of the circuit is constant regardless of the angle of the copyboard cover.

When no document is present, the output of the circuit from the first measurement is low or none at all;theoutputofthecircuitfromthesecondmeasurement, on the other hand, is high because the light is reflected by the document sheet.

If the document is too thick and, therefore, if only

SW4goesON. thedocument sizeis identified based on the output level of this time.

COPYRIGHT 8 1992 CANON INC.

C A N O N NP2120/2070 R N . 0 MAY 1590 PRINTEO I N JAPAN IIMPRIME AU JAPON]

3-21

O P E R A T I O N S A N D T I M I N G

C o p y b o a r d cover switch 1 (SW4)

C o p y b o a r d cover switch 2 (SW5)

D o c u m e n t i d e n t i f i c a t i o n t i m i n g

D o c u m e n t i d e n t i f i c a t i o n circuit L E D

-

C o p y b o a r d cover m o v e d up r Y

ON

C o p y b o a r d cover m o v e d down

77

200 50

Tl 0

I I

I

I

1

I

! D C controller identilies

I the dacument size

I l

ON

-

OFF

1 O F F

I

Figure 3-20 Document Identification Timing

3-22

COPIAIGHT 0 1992 C A N O N ING.

C A N O N NP2120/2020 KV.0 M A Y 1990 PRINTEO IN JAPAN ( I M P R I M E AU JAPONI

3. Identification of Document Size

The DC controller identifies the size of documents based on the levels of the output from the document identification circuit; see Table 3-3.

O P E R A T I O N S A N D T I M I N G

Document identification circuit 11

121 Ix4 I

constant ) vatying ) constant 1

3 A4 constant constant varying

I I I vafying

I constant varying =l= varying varying varying constant: no change to output of document identivafying fication circuit; recognizes resence of document.

varying: change to output of document identification circuit; recognizes absence of document.

Table 3-3

v

I r r

- - - Dccument i d e n t i f i c a t i o n cir

D o c u m e n t i d e n t i f i c a t i o n c i r c u i t t p ’ -l-& __~

D o c u m e n t identificatlon signa1 1 (DSZl)

D c c u m e n t identification signa1 0 ( D S Z O )

D c c u m e n t Identilication signa1 2 ( D S Z 2 ) t

1

D C conlroller PC6

Copybard MVW signa1 2 (CSCC2)

Figure 3-21

C A N O N NPZl20/2MO RN.0 MAV 1990 PRINTEO I N J A P A N IIMPRIME AU JAPONI d CUPVAIGHT 0 1992 C A N O N ING.

3 - 2 3

O P E R A T I O N S A N D T I M I N G

A. Outline

Figure 3-22 shows the construction of the image formation system, and the system has the following functions:

- Controls the scanning lamp.

- Controls the primary/transfer coronacurrent and grid bias voltage.

- Controls the developing bias.

- Measures the document density.

- Controls the developing assembly and drum cleaning unit.

- Controls the blank shutter.

L a m p regulator

-

c:

5

I

I

3

AE senso,

Photosensitive drum

Pre-exposure lamp

I cylinder

Black d e v e l o p i n g I a s s e m b l y

/‘^‘\

‘.

LA--,r

I

\

Developing l

G R D O N r

High-voltage transformer

3-24

Figure 3-22

COPVNIGNT 0 1992 C A N O N I N C .

C A N O N NPZl20/2MO MEV.0 MAV 1990 PAINIEO IN JAPAN IIMPRIME AU JAPONI

B. Basic Sequence of Image

Formation

P O W E R switch ON C O P Y S T A R T kev

O P E R A T I O N S A N D T I M I N G

PtimaryITransfercorona unit

G r i d tias

I

I l I 1-1

I

J

I I

Figure 3-23

COPVRIGHT 0 1992 CANON I N C .

C A N O N NPZl20/2MO RN.0 M A V 1930 PAINTEO IN JAPAN IIMPAIME AU J A P O N I

3-25

C. Controlling the Scanning

Lamp

1. Outline

The scanning lamp iscontrolled bythe DC controller

PCB as follows; see Figure 3-24.

- Turns the scanning lamp ON and OFF.

* Controls the scanning lamp intensity.

2. ivlechanism

a.

Turning the Scanning Lamp ON and OFF

The microprocessor (slave; Q302) on the DC controller PCB causes the transistor (Q324) to goON,therebycausingthescanninglamp(LAl) to go ON; the lamp goes OFF when Q324 goes

OFF.

b.

Controlling the Scanning Lamp Intensity

The intensity of the scanning lamp is varied by controlling the voltage supplied to it in response to the level of the intensity adjustment signa1

(LINT) from the DC controller PCB.

The LINT signa1 varies between 10 and 16 V as determined by the copy density correction lever, controlling the voltage supplied to the scanning lamp so that it varies between 50 and

75 V (phase control).

WhentheCTunitisused,thevoltageapplied to the scanning lamp is raised by about 1.8 V as opposed to when the black developing assembly is used so as to increase the intensity of the scanning lamp. A constant voltage (70 V), however, is applied to the scanning lamp during

AE exposure for both the black developing assembly and CT unit.

c. Error Identification Circuit

The scanning lamp is monitored using the lamp

ON signa1 (LIGHT).

lf the scanning lamp ON signa1 (LIGHT) is present on the DC controller for about 20 sec continuously, the error identification signa1 generates the AC power OFF signa1 (ACOFF) to cut off the AC power; see p. 3-47.

i

T

S c a n n i n g lamp

(LAI)

3-26

D C wntroller P G B

-2 LMPOr\!

-5

S w i t c h i n g

- circuit

-5 ZXDP -2

circuit

Lamp reg&tor

Figure 3-24

COPVRIGHT 0 1992 CANON INC.

C A N O N NPZl20/2MO RN.0 M A V 1990 PAINTEU IN JAPAN IIMPAIME AU JAPONI

Theerrordetectioncircuit alsogoesONwhenthe thermal fuse (Ful) or the scanning lamp blows, causing the relay (RLI) togo OFFandcuttingthe AC power.

The above condition prevents generation of

the

zero-cross and causes ‘E221’ to be indicated on the control panel.

3.

Copy

Density Correction

Lever

The copy density correction lever serves to prevent foggy images caused by deterioration of the photosensitive drum. The copy density correction lever changes the intensity of the scanning lamp, and a higher frees the copies of fogging.

2

%

E

3

4

P a

CV)

75 --- , t

I

I t

16

L I N T signa1

(Setbycopydensitycorrection lever.)

,

I

I

10 (VI

Figure 3-26

Figure 3-25 Copy Density Correction Lever

COPYAIGNl CC 1992 C A N O N I N C .

C A N O N NPZlM/2DZO RN.1 JAN. l!Z!'2 PRIIITfD IN JAPRN [ I M P R I M E AU JAPOHI

3-27

WI¶ O P E R A T I O N S A N D T I M I N G

D. Controlling the Primary/

Transfer Corona Current and the Grid Bías Voltage

1. Outline

Figure 3-27 shows the circuii which controls the current for the primary/transfer corona unit and the voltage level of the grid bias; it has the following functions:

@ Turns the primaryltransfer corona current ON and OFF;

@ Controlstheprimary/transfercoronacurrenttoa constan! value;

@ Switches the grid bias voltage level of the primary corona unit.

@ Controls the grid bias voltage of the primary corona unit.

Theoutputtotheprimarycoronaunit iscontrolled toa constant value; the shield current is controlled to eliminate the effects of environmental changes on the corona discharge.

The primary corona current and transfercorona current are turned ON and OFF by the high-voltage output signa1 (HVTON).

The grid bias voltage level is switched by the grid bias control signa1 (GRDON).

D C controller P C S r

1

7.

High-voltage transler ( H V T )

2. Turning the PrimaryiTransfer Corona

Current ON and OFF

@ When HVTON = 1, bdifferential amplifier circuit goes OFF.

4variablepulsegeneratorcircuitgoesOFF.

bHigh-voltage transformer goes OFF.

0 When HVTON = 0, bdifferential amplifier circuit goes ON.

bvariablepulse generatorcircuit goes ON.

b High-voltage transformer goes ON.

3. Controlling the Primary/Transfer Corona

Current Constant

If a corona current larger than the specific value flows from the primary corona unit because of changes in the environment. the level of the feedbacksignal totheifferentialamplifiercircuit increases andtheoutputofthecircuitdecreaseqthecondition in turn decreases the corona current from the primaryltransfer corona unit, thereby controlling the current to a specific value.

If an over-current flows on the output side of the high-voltage transformer used for primary/corona unit, the limit control mechanism is activated to keep the flow to a specific value.

Primary c o r o n a unit

3-28

Figure 3-27

COPYRIGNT 0 1992 C A N O N ING.

C A N O N NPZ12O/ZMO REY.0 M A Y 1990 PRINIKI I N JAPAN IIMPRIME AU JAPONI

4. Turning the Grid Bias ON and OFF

@) When the image is exposed, the DC controller

9=“,““,=,.

%7goesON; nooutputfromthecomparator circuit.

bQ6 goes OFF.

bcurrent flows into the transformer

(14); 05 goes OFF.

“~í;;“B”,ha,;“.

The voltage applied to the grid is returned to the comparator circuit. thereby providing a constant voltage.

@ When the image is not exposed, the DC controller generates GRDON=l.

ka7 goes OFF; output from the comparator circuit.

bQ6 goes ON.

L*current does not flow into the transformer (T4).

bgrid bias is not applied.

The above condition does not charge the drum and, as such, toner is not attracted to the photosensilive drum (blank control).

COPYAIGHT G 1992 C A N O N I N C .

C A N O N NPZi20/2MO R N . 0 M A Y 1990 PAINTEO IN JAPAN [ I M P R I M E AU JAPONI

3-29

E. Controlling the Development

Bias

1. Outline

Figure 3-28 shows the circuit that controls the development bias and has the following functions:

0 Tums the development bias AC component ON and OFF.

Q Controls the development bias DC component voltage level.

The copier varies the voltage level of the developmentbiastocontrolthecopydensityaccordingtothe settings of the following:

- Copy density key position

- AE sensor output

- Developing assembly type

When the black developing assembly is set. J24-1 and -4 are shorted by means of a jumper wire, thereby identifying the presente of the assembly.

2. Mechanism a. Tuming the Development Bias AC Component

ON and OFF

The square wave osciilatorcircuit is at work at all times as long as power is present.

@ When ACBON=l,

4AC bias switch circuit goes ON.

bsquare wave oscillator circuit output is cut.

The above condition deprives the developing cylinder of AC biases.

Q When ACBON=O, bAC bias switch circuit goes OFF.

The above condition causes the AC bias switch circuit to go OFF; as such, the output of the square wave oscillator is sent to the Tl drive circuit. raised lo 1300 VAC, and is supplied lo the developing cylinder. The output of the AC highvoltage transformer, on the other hand, is rectified by the rectifier circuit and supplied to the static eliminator (about 3.2 KV).

3-30

COPYAIGHT 0 1992 CANON ING.

C A N O N NP2lZO/ZGZO RN.0 MAY 1990 PNINTED I N J A R N I M P R I M E AU JAPONI

b.

Controlling the DC Bias Voltage Level

Fioure 3-28 shows the differential amplifier circuit, which operates when DCBC is 16 V or less.

Controlling the DC Bias Voltage Level

DCBCis6to16V.

bdifferential amplifier circuit goes ON.

bvariable pulse generator goes ON.

hDC high-voltagetransformergoesON.

O P E R A T I O N S A N D T I M I N G B

The above condition supplies the developing cylinder with DC biases.

DCBC varies between 6 and 16 Vas adiusted by the copy density key.

I

DCBC I 6to16V

Development bias

DC component

(black developing assembly)

450 to 430 v

Developing bias

DC component

(CT unit)

480 to-110 V

High-voltage transformer (HVT) D C controller r---

C T unit is used.

Figure 3-28

COPYRIGNT 0 1992 C A N O N ING.

C A N O N NPZWl/2MO KV.0 M A Y 1990 PNINTEO I N J A P A N IIMPAIME AU JAPONI

3-31

m O P E R A T I O N S A N D T I M I N G

3. Control Sequence for Development Bias

C O P Y S T A R T k e y ON

S T B 1 -, ó‘

\\hlLP i\IlLPR ’ IhTR SCF\\ SCRT SCF\\' SCR\I LSTH S'I'UY

G r i d b i a s

Figure 3-29

@ The levels of the development bias DC component control signa1 and DC bias vafy according to the copy density key and AE sensor output.

The level of the DC bias during image exposure varies according to the type of developing assembly.

@ The level of the DC bias varies according to the type of developing assembly; other than during image exposure.

. black developing assembly -320 V (approx.)

. CT unit _,___._.__._________......................... -220 V (approx.)

Note:

The development bias AC component when the CT tmit is used is synchronized to the main motor

3-32

COPYRIGHI 0 1992 CANON ING.

C A N O N NP2,20/2MO NEV.0 MAY 1930 PRINTEO I N J A P A N IIMPNIME AU JAPON)

F. Measuring the Document

Density

1. Outline

The copier has an automatic exposure (AE) mechanism, which controls the DC component of the development bias according to the density of the document. If the document is uniform in density, the

AE mechanism varies the DC omponent of the development bias to enable reproduction of fog-free copies.

2. Mechanism

The scanner is moved forward about 70 mm from the image leading edge with the scanning lamp kept

ON; the AE sensor reads the document density, and the output is sent to the DC controller.

Based on the output from the AE sensor, the DC controller controls the DC component of the development bias.

(approx.)(approx.)

N O T E : A represen& AE s e n s o r positmn.

Figure 3-30

3. Fteading the AE Sensor Output

The AE sensor consists of a photodiode (Q702) and operation amplifier (Q701); when the light received by the photodiode (reflected by the document) is strong, the output voltage (AE) of the operation amplifier is low; on the other hand, if the

The DC controller reads the output (AE) of the AE sensor based on the zero-cross signa1 (ZXDP) sent by the lamp regulator.

Thelimitercircuitconsistsof Q701 (2) anddiodes and serves to cut AE output of 5 V or more to prevent damage to the microprocessor (Q302).

IftheAEoutputfallsunderl.O,avoltageof 1 Vwill be assumed; if the AE output rises above the setting of VR2. it is lowered to maintain the setting.

__--_--_----- --- ----

I I

I

D C controller P C B r---l I

L-

COPYNIGHT @ 1592 CANON I N C .

AEsensor

- -

Adjusting P C B

Figure 3-31

C A N O N NPZt20/2020 NN. J A N . 1992 PRINTEO I N J A P A N IIMPRIME At, JAPON, d

3-33

~OPERATIONSAND T I M I N G

4 . Adjustment

The following adjustments should be made when the AE sensor or adjustment PCB has been replaced; starl with adjustment of the AE referente point and then AE slope, and make sure both adjustments are made without fail.

@ Adjusting the AE Referente Point

1) Remove the adjustment cover from the rear of the left cover.

2) Switch the power ON.

* Wait untilthe WAITstate isoverand theCOPY

READY indicator is green.

3) Place an NB-3 Test Sheet or NA-2 Test Sheet, and close the copyboard cover.

4) Press the push switch (SWI ; service switch) on the adjusting PCB.

- ‘0’ will be indicated on the copy counter on the control panel.

- If the indication is not’O’, enter’o’on the tenkey pad on the control panel.

5) Press the SORT/GROUP key on the control panel.

- The scanner moves forward to the AE measurement point, and the scanning lamp goes

ON.

Note:

The scanning lamp remains ON for about 8 sec; to turn it ON once again, press the SORT/

GROUP key, and press the key once gain after the operation stops.

6) Adjust VR1 (AE ref.) on the adjusting PCB so that the copy counter on the control panel indicates ‘20’.

TestSheet N e w s p a p e r

Figure 3-32

7) Press the SORT/GROUP key after making adjustments.

- The scanning lamp goes OFF, and the scanner returns to the home position.

“(2) AE slope adjustment” should be made continuously.

AE adjustment can be completed by performing”(1) AE referencepoint adjustment” though

“(2) AE slope adjustment”.

3-34

COPYRIGHT 0 1992 C A N O N ING.

CAHON ffP2l20/2020 AEV.I J A N . 1992 PRINTEO I N J A P A H IIMPAIME AU JAPONI

@ Adjusting the AE Slope

1) Remove the Test Sheet, place a newspaper on the copyboard, and close the copyboard cover.

2) Press the SORTIGROUP key on the control panel.

* The copier operates as in step 5) of “Adjusting the AE Referente Point.”

3) Take notes of the value shown on the copy counter of the control panel.

4) Press the SORT/GROUP key on the control panel.

- The copy counter on the control panel will indicate ‘0’.

5) Enter ‘1’ on the tenkey pad on the control panel.

- The copy counter on the control panel will indicate ‘1’.

6) Press the SORTIGROUP key.

7) Turn VR2 (AE slope) on the adjusting PCB so that the value on the copy counter of the control panel is the same as the value recorded in step

3)

8) Press the SORT/GROUP key after making adjustments.

9) Press the push switch (SWI) on the adjusting

PCB

Blank

Test S h e e t N e w s p a p e r

Document denslty

Figure 3-33

Figure 3-34 Adjusting PCB

COPYAIGHT @ 1992 CAllON I N C .

C A N O N NPZlZO/ZMO R N . 0 M A Y 1990 PRIHTEO I N J A P A H IIMPAIME AU JAPONI

3-35

m O P E R A T I O N S A N D T I M I N G

G. Developing Assembly and

Drum Cleaning Unit

1. Outline

The blade and developing cylinder inside the drum cleaning unit are rotated by the drive from the main motor.

The level of toner inside the black developing assembly is monitored by the toner sensor (Q9): and, whenthefevelfalls belowaspecifiedvalue, the

ADD TONER indicatoron the control panel starts to flash.

The CT unit cannot be replenished with tener; replace the CT unit as a whole when it runs out of toner.

The toner collected by the cleaning blade is stored inside the drum cleaning unit.

Thedevelopingassemblyisbrought intocontact with the photosensitive drum together with the developing assembly rail by the developing assembly release lever.

2. Monitoring the Toner Level

A piezoelectric oscillator toner sensor (Q9) is provided inside the black developing assembly to monitor the level of toner.

Theoutputofthetonersensorremains’i’as long as a specific level of toner is inside the assembly; whenthetonerdecreases belowthelevel,theoutput goes ‘0’.

The DC controller reads the output signa1 for 5 sec aftercopy operation is over; if the signa1 remains

‘O’continuously, it recognizes ‘no toner 1’. When ‘no toner 2’ is recognized, the DC controller flashes the

ADDTONERindicatorandprohibitscopyoperation.

The CT unit is not equipped with a toner level detection mechanism, or the cleaning unit is not equipped with a waste toner level detection mechanism.

3. Torque Limiter

If a large load is imposed on the photosensitive drum while the drum is rotating forsome reason, the torque limiter cuts off the drive from the main motor to stop the rotation of the drum.

D r u m c l e a n i n g unit

3 - 3 6 i l

Figure 3-35

COPYAIGHT Q 1992 CANON INC.

C A N O N NPZl20/2MO RN.0 M A Y 1990 PRINTEO I N J A P A H IIMPRIME AU JAPONI

H. Blank Control

1. Outline

To black out (white out) the non-image section between two copies, the copier changes the potentialonthegrid biasoftheprimarycoronaunit instead of using blank exposure; see p. 3-29.

To black out the non-image section for reduced copies or section not in contact with the drum in the

DIRECT mode, the light of the pre-exposure lamp is directed against the drum by way of the reflecting plate, thereby preventing adhesion of toner on the drum.

2. Controlling the Blank Exposure Shutter

The copier uses the light from the pre-exposure lamp to black out the non-image section in the

REDUCE mode or section not in contact with the drum in the DIRECT mode.

The blank exposure shutter serves to control the area over which the light is directed.

The blank exposure shutter is operated by the drivefrom the lens drive motor (M3) by way of gears when the blank shutter solenoid (SL4) is OFF.

The lens drive motor first returns the blank exposure shutter to the home position (at Q2); it then rotates in response to the drive pulses from the DC controllersuitedtothereduction ratio, therebysliding the blank exposure shutter.

Blank shutter solenoid (SL4) Lens d+/e motor (M3)

B l a n k s h u t t e r h o m e posifion s e n s o r (CIZ)

B l a n k e x p o s u r e shuner

Pre-exposure l a m p

Phofosensitive drum

Figure 3-36

COPYAIGHT 0 1592 C A N O N ING.

C A N O N NP2120/2MO KV.0 M A Y 1990 PAINTEO I N J A P A N IIMPAIME AU JAPONI

3-37

m O P E R A T I O N S AND T I M I N G

1. Controlling the Transfer

Corona Wire Cleaning

Mechanism

1. Outline

The copier has an automatic cleaning mechanism for the transfer corona wire; cleaning is executed when the power switch is turned ON or when the fixing assembly is 1OO”C/212”F or below.

2. Cleaning Niechanlsm

The wire cleaner is moved by the cleaner motor

(M4) back and forth once along the wire (about 20 sec).

When the wire cleaner mount moving folward by

M4 actuates the microswitch (SW9) located at the rear of thetransfer rail, M4 rotates in reverse to move the wire cleaner in reverse.

The wire cleaner stops when the wire cleaner mount actuates the microswitch (SW6) located in front of the transfer rail (home position). If SW6 is not actuated, the COPY START key on the control panel remains red for 90 sec even after the wait period is over.

If the power is turned OFF in the middle of cleaning operation, the wire cleaner mount stops where it is. If the transfercorona assembly has been dertached in this condition, attach it back to the copier while holding the wire cleaner at the rear by hand.

Cleaner m o t o r ( M

/ er c o r o n a unit re c l e a n e r h o m e sition s w i t c h ( S W 6 )

3 - 3 8

M o t o r driver P C S D C controller PCS

Figure 3-37

COPYAIGNT & 1592 C A N O N ING.

C A N O N NPZl20/2MO AEV.I J A N , 1992 PRINTEO I N J A P A N IIMPRIME AU JAPONI

A. Outline

Figure 3-39 shows the basic construction of the pick- up/feed system.

When the pick-up clutch solenoid (SLI or SL2) goes ON while the main motor (MI) is rotating, the drive of the main motor causes the pick-up roller to rotate, thereby movingthe paperto feeder roller 1 or

2.

Afterhaving passedthroughthefeederroller,the copy paper is moved by the registration roller so that the leading edge of the image on the photosensitive drum and that of the copy paper match; thereafter, the paper is sent to thetransfer unit, separation unit, feeder unit, fixing assembly, delivery unit, and to the copy tray.

The path along which the copy paper moves is provided with photointerrupters (Q3, Q5) servicing as the pre- registration and separation sensors and withacontactsensor*(SW8),asthedeliverysensor.

If the paper fails to reach or pass the sensors within a specific period oftime, thecondition is identified as a jam and the JAM indicator on the control panel starts to flash.

The counter increases by one when the delivery sensor (SW8) detects the trailing edge of the copy paper.

The control card, on the other hand, increases the count in response to each pick-up.

The presente of paper in the upper and lower cassettes is checked by photointerrupters (Q6, Q7); if paper is absent, the cassette out signa1 (UPCPD,

LCPD)goes’O’andtheADDPAPERindicatoronthe control panel starts to flash.

* The contact sensor used as the copier’s delivety sensor (SW8) makes use of attraction of a permanent magnet to drive the reed switch.

The paper detection lever is equipped with a permanent magnet and, when the magnet comes into contact with the reed switch, the switch goes

OFF; the switch goes ON (paper resent) when the magnet is off contact.

Figure 3-38 Contact Sensor

COPYAIGNT 0 1992 C A N O N ING.

C A N O N NP212012MO RN.0 MAY 1930 PRINTEI IN JAPAN [IMPRIME AU JAPONI

3-39

OPERATIONS AND TIMING

,

,

>

5 r

>

1

2

>

>

DC controller PCB

.

,’ *

:

:

; c f

Clubh

Figure 3-39

3-40

COPYAIGNT 8 1992 CANON ING.

CANON NPZl20/2020 RN.0 MAY 1990 PAINTEO IN JAPAN IIMPRIME AU JAPONI

2. Sequence for Pick-up/Feed System

COPY START key ON

ON

OPERATIONS AND TIMING

. Control Card V, if attached, ,ncreases the coun, when the pick-up clutch solenoid (SLI, SLZ) goes ON.

Figure 3-40

COPYAIGNT 0 1992 CANON INC.

CANON NPZ120/2MO REY.0 MAY 1990 PAINTED IN JAPAN IIMPRIME AU JAPONI

3-41

m OPERATIONSANDTIMING

3. Manual Feed Pick-Up (NP2020)

When copy paper is slid along the manual feed tray, the manual feed sensor (Qf3) detects the copy paper and the main motor (Mi) starts to rotate in response.

DC confroller PCB

At the same time, feeder roller clutch 1 (CLI) goes ON, thereby feeding the paper up to the registration roller.

The sequence used to feed the copy paper in the manual mode is the same as in feeding A3 paper regardless of the size of the copy paper.

Registration roller

Figure 3-41 copy papes set

Manual feed pi&up roller

3-42

Feeder roller clutch 1 (CLl)

Figure 3-42

COPYAIGHT Q 1992 CANON INC.

CANON NPZl20/ZMO AEV.0 MAY 1990 PAINTEO IN JAPAN IIMPRIME AU JAPONI

4. Using the Multifeeder (NP2120)

a. Outline

When you are using the multifeeder, copy paper is picked up from the stack on the tray. This way, you can feed sheets one after another.

Thepresenceofastackonthetrayis detected by the multifeeder paper sensor (Q8).

OPERATIONS AND TIMING

The stack on the tray is pushed against the pickup roller by the paper guide plate. The pick-up roller is rotated by the drive from the main motor (Mi) transmitted by clutches.

The pick-up roller and the separation pad pick up onesheetofcopypaper, andsendittothe registration roller.

The foregoing series of operations is executed for each pick-up.

Main motor

Multifeeder sensor

Papa sensor lever

Phok

Figure 3-39a

COPYRIGNT & 1932 CANON ING.

CANON NPZ120/2MO RN.0 DEC. 1592 PAINTEO IN JAPAN [IMPRIME AU JAPON)

3-42a

m OPERATIONS AND TIMING b. Sequence of Operations (pick-up from multifeeder)

COPY START key

ON

Figure 3-39b

3-42b

CWf’flIGHT 0 1992 CANON ING.

CANON NPZl20/2020 RN.0 OEC. 1992 PRINTEO IN JAPAN IIMPRIME AU JAPONI

u2

(See Note.)

A4

(210X297)

B5R

1257X182)

B4

(364X257)

A4R

(297X21 0)

A3

(420X297)

Ul

(See Note.)

Ul

(See Note.) u2

(See Note.)

Letter 8.5”Xll”

:216X279)

Mini 5 5”X8.5”

:216X;403

-egal 8.5”X14”

:356X21 6)

-etter R 8.5”Xll”

:279X21 6)

_edger R ll”X17”

1432X279)

B. Identifying the Cassette Size

The presence/absence of a cassette in the cassette holderand thesize thereof are identified byfour switches (CSTI through CST4) provided in each cassette holder.

x

No cassette

OPERATIONS AND TIMING m

Based on the combinations of the switches which have been actuated, the microprocessor recognizes the presence/absence of a cassette as shown in

Table 3-4 and, at the same time, determines where to reverse the scanner and how to control the blank shutter.

(right)

0: SW is OFF.

1: SWisON.

Note:

ULI : Argentine-LTR

Govemment-LTR

Korean Govemment

ULZ: Argentine-LGL

Govemment-LGL

Argeniine-LTR-R

Govemment-LTR-R

Foolscap

Folio

Australian Foolscap

Korean Government-R

OFICIO

Equadoran OFICIO

Bolivian O F C I O

1

III Io

1 0

1 1

I

111 I’

1

Table 3-4

0

(unit: mm)

3-43

COPYAIGNT Q 1592 CANON ING.

C A N O N

~~n2012020 nN.1

J A N

. 1932 PAINTUI

IN JAPAN

IIMPAIME AU JAPONI d

C. Fixing Assembly and Delivery Assembly

1. Controllfng theFfxfng RollerTemperature

The upper and lower rollers of the fixing assembly and the delivery roller of the delivery assembly are driven by the main motor (Mi).

The upper roller has a built-in heater (Hl ,90 W), which heats the roller.

The DC controller monitors the surface temperature of the upper roller by a thermistor (TH) to make sure that it will remain as specified.

The specifics of the control are as follows: a. NP2020

@ when the black developing assembly is used, control temperature

(standby/copying) _..____._.......................... 170°C control temperature (pre-heat) ._................ 140’

Q when the CT unit is used, control temperature (standbylcopying) 150°C control temperature (pre-heat) 140” b. NP2120

0 when the black developing assembly is used, control temperature (standby/ copyingl preheat) ._.................................

155°C

Q when the CT unit is used, control temperature (standby/pre-heat) . ..15O”C control temperature (copying) 1 6 5 ”

To prevent lowering of the surface temperate of the upper rollerduring continuous copying. the control is switched as follows when copying lasts about 15 seconds.

a. NP2020

@ when the black developing assembly is used,

- If small-size paper is used, 170°C is switched to

175°C control

- If large-size paper is used. 170°C is switched to

185°C control

Q when the CT unit is used,

- If small-size paper is used, 150°C is switched to

155°C control

- If large-size paperis used, 150°C is switched to

165°C control

Note:

Small-size papers include A4, 85, LTR, and

A4R.

Large-size papers include A3, 84, 1 l’k17”,

LGL b. NP2120

@ when the black developing assembly is used and pick-up is from the cassette,

- If A4,B4, A3, LTR, or Il “x1 7” is used. 170°C is switched to 185°C control; otherwise. 170°C is switched to 175%

Q when the blackdeveloping assembly is used and pick-up is from the multifeeder,

- IfA4Rorlongerpaperisused, 170°Cisswitched to 185°C control; othelwise, if paper shorter than A4R is used, 170°C is switched to 175°C control

@I when the CT unit is used and picl-up is from the cassette,

- If A4. B4, A3, LTR, or 11”x17”isused, 155”Cis switched to 170°C control: otherwise, 150°C is switched to 160°C

@ when the CT unit is used and pick-up is from the multifeeder,

* IfA4Rorlongerpaperisused.165°Cisswitched to 175°C control; otherwise, if paper shorter than A4R is used. 165°C control is used as is

The copier is equipped with the following four types (or three types if NP2020) of protection mechanism to prevent the fixing heater from going ON at the wrong timing.

The microprocessor monitors the voltage of

TH1 ; when it finds an error, it issues EOOO or

EOOO. (See the SERVICE HANDBOOK.)

If the voltage of TH1 lowers to about 1 .O V or lower (220°C equivalent), the error detection circuit cuts off the power to the fixing heater regardless of the output of the microprocessor.

(See p. 3-57.) lf the temperature of the thermoswitch exceeds

230°C. the thermoswitch goes OFF to cut off the power to the fixing heater.

If the SSR ON detection PCB detects the activation of the SSR, it sends the SSR ON signa1 to the DC controller PCB. In response, the DC controller PCB compares the output timing of the HTRD signa1 and the SSR ON timing, issuing E004 upon identification of an error

(applies to NP2120 only: see the SERVICE

HANDBOOK).

Note:

Do not use the thermal switch (TS) once it has opened; it cannot serve fts purpose unless cooled to 0°C or less, not returning to normal at ambient temperature.

3-44

COPYAIEHT 0 1592 CANON INC.

C A N O N NPZl20/2MO KV.1 DEC. 1992 PAINTED IN JAPAN IIMPAIME AU JAPONI

2. Oil Application Roller

The upper fixing roller is provided with an oil application roller for cleaning and application of oil.

Normally, the oil application roller remains away from the fixing roller, and it comes into contact with the upper fixing roller only when copy paper passes through.

O P E R A T I O N S A N D TIMING B

The mechanism is driven by the oil application rollersolenoid (SL3); SL3 goes ON as soon as copy paper reaches the separation sensor (Q5), thereby bringing the oil application roller intocontact with the upper fixing roller.

SL3 remains ON for about 4 seconds as timed by the microprocessor; however, it goes OFF as soon asthemainmotorstops ifthecopypaperisdelivered withjn 4 seconds.

oil application roller solenoid

~.

DC controller PCB

5320-2 OILSL

(HI) \

!

-@ Main m o t o r

5313-g TH

- 8

7

1

(23OW

446°F)

“pper lixing heater w rulicr(,

SSR ON

I detect,o” circuit

1 ,510o

( N P 2 1 2 0 only) 1

- 7 ACOFF Error detectrc circuit

Figure 3-43

COPYAIEHT Q 1592 CANON INC.

CANON NPZl20/2020 RN.1 OEC. 1992 PAINTEO IN JAPAN IIMPRIME AO JAW

3-45

B?BI OPERATIONSANDTIMING

‘1 ‘2

165”C/329”F 17OYY336”F

(145”C/293”F)(150’C/302°F) ~~ ~~ ~~

P O W E R switch rlFF controlled at 150°C/302”F (CT unit)

Figure 3-44

When the copier enters the pre-heat mode in response to a press on the PREHEAT key, the temperature of thefixing assemblyiscontrolled to 140°C regardlessofwhetherthe blackdevelopingassemblyorCTunit isused.

However, in the case of the NP2120, the temperature is controlled as in the standby period.

‘1 140°C; if NP2120, 160%.

'2 155°C:

if NP2120, 170°C.

3-46

COPYRIONT 0 199’2 CANON INC.

CANON NP2l20/2020 REY.1 OEC. 1992 PRINTEO IN JAPAN IIMPAIME AU JAPON)

D. Error Detection Circuit

(NP2020)

The error detection circuit is found on the DC controller PCB and serves to monitor the fixing temperature and scanning lamp; Le., abnormal rises in the former, and timing of activation of the latter.

lf any of the above conditions occurs, the output of the circuit causes the relay (RLl) to go OFF, thereby cutting the supply power (AC) to the fixing heater and lamp regulator.

2. Mechanism

Whenthevoltageofthethermistorreachesabout

1.0 V because of a rise in the temperature of the fixing roller, the output of the No. 1 comparator of

(2309 goes ‘0’.

The lamp regulator generates LIGHT=l (scanning lamp ON signal) at all times as long as the scanning lamp is ON.

The above conditions cause the No. 2 comparator of Q309 to generate ‘1’. thereby charging the capacitar (C333).

C333 becomes fully charged about 20 seconds thereafter: and output ‘1’ of the No. 2 comparator is sent to the negative (-) input side of the No. 3 comparator. As a result, the output of the No. 3 comparator of Q309 goes ‘0’.

T h e above conditions generate ACOFF=O, thereby causing the relay (RLI) to go OFF.

The copier can be reset after activation of the errordetection circuit by turning it OFF and then ON.

Q309

+

Error detection circuit

(DC controller PCB)

1 1

Figure 3-45

15313-g

/_

15303-6

COPYAIGHT 0 1992 CANON INC.

C A N O N NPZl2O/ZMO RN.0 MNY 1990 PRINTED IN JNPAN IIMPAIME RU JAPONI

3-47

OPERATIONS AND TIMING

E. Error Detection Circuit

(NP21 20)

1. Outline

The error detection circuit is built into the DC controller, and is used to monitor the surface temperatureoftheupperfixingroller,theconditionofthe fixing heater, and the condition of the scanning lamp.

The signals (LIGHT, SSRON, HTRD, TH) shown in Figure 3-45a are input signals to the error detection circuit.

An error in these signals causes the error detection circuit to issue the ACOFF signal, thereby activating the AC shutoff relay (RLl).

Fixing heater (Hl)

DC controller

2. Mechanism

Figure 3-45a shows the error detection circuit, and Table 3-5 lists the conditions for its activation.

The error AC shutoff relay (RLl) goes OFF in response lo the output of the errordetection circuit in terms of both software and hardware.

Figure 3-45a

a. Detection by Software

Ifanerrorinthesurfacetemperatureoftheupper fixing roller (220°C) or the activation of the fixing heater is detected in terms of software, the error AC shutoff relay (RLl) is turned OFF immediately and an error code is displayed.

3-47a

COPYRIGNT 0 1992 CNNON ING.

CANON NPZl20/2MO RN.0 OEC. 1992 PAINTED IN JAPAN (IMPRIME AU JAPONI

b. Detection by Hardware

If the software detection mechanismfails to function, the error AC shutoff relay (RLI) is turned OFF under the following three conditions (A, B. C).

@ thescanning IampONdetection signa1 (LGHT) leams that the scanning lamp remained ON continuously (about 20 sec).

OPEWTIONSANDTIMING

@ the SSR ON signa1 (SSR ON) identifies the activation of the heater despite the absence of the heater drive signa1 (HTRD) generated by the microprocessor.

@ the fixing temperature detection signa1 (TH) idenlifies overheating (about 230°C) of the thermistor.

Fixing temperalure detection signa1

Error detecbon circuit

S S R ON signal-

Heater d r i v e signal

Scanning lamp-

ON signa1

, GHT

Figure 3-45b

COPYRIGHT 0 1992 CAHON IHC.

CAHIIH HPZWIL'MO RN.0 OEC. 1992 PRINTUI IN JAPAN [IMPRIME AU JAPONI

3-47b

w OPERATIONS AND TIMING

Error Code

EOOl ..’ When the output of the fixing temperature detection signa1 (TH) exceeds 23O”C, the error detection circuit issues EOO to the microprocessor. In response, the microprocessordisplays EOOI. If E004 has been identified in advance, the microprocessor displays E004 instead.

E004 .‘. The heaterdrive signa1 (HTRD) is not generated for 3 seconds after power-on.

E004 is issued if the SSR ON is issued to the DC controller during the absence of the heater drive signal.

E004 is also issued when the DC controller identifies the SSR ON signa1 for 3 seconds or more in the absence of the heater drive signal.

Anyoftheaboveconditionscausesitsrespective error code to be displayed on the control panel; see

Table 3-5.

Table 3-5

3-47c

COPYAIGHT 0 1992 CdNOR IHC.

CANON NPZl2012Ui’C NEV.0 DLC. 1992 PRINTEU IN JAPAN [IMPRIME AU JAPONI

B OPERATIONS AND TIMING

F. Jam Detection

The copier monitors the movement of copy paper using the following three sensors:

* Pre-registration sensor (Q3)

- Separation sensor (Q5)

- Delivety sensor (SWB)

Jams are identified in terms of the presencel absence of paper at respective sensors at such times as programmed in the microprocessor in advance.

The copier has mechanisms that remember the

“remaining number of copies” and the “copy modes” in response to a jam, and such data are retained for about ten minutes after the front cover is opened, cutting out the power.

The microprocessor holds the following five jam detection sequences and, further, it identifies a jam if paper is detected at time of power-on.

When the copier identifies a jam, it immediately stops operation and cuts out power to the fixing heater (HI); at the same time, it flashes the ‘JAM’ indicatoron the control panel, indicating the location of the jam.

No count is taken for jams which activate these mechanisms.

Photosensitive drum

+ + ka

Delivery sensor (SWB)

,

Upper fixing roller

1 ~ ~+> ~~ , r,.Eg~strationroller

0

Separation sensor (as)

Pre-registration sensor

IW

-I;

Figure 3-46

3-48

COPYAIGHT Q 1592 CANON ING.

CANON NP2120/2MO NEXO MAY IP30 PRINTEO IN JAPAN IIMPNIME AU JAPOH)

OPERATIONSANDTIMING

@ Pick-Up Delay Jam

The microprocessor identifies a pick-up delay jam il the paper fails to reach the pre-registration

COPYSTARTkey

ON sensor (Q3) within a specific time after pick-up operation.

Pick-up clutch solenoid (SLl,SL2)

Jamckck

Pre-registration sensor(ca3)

Main motor(M1)

Fixing heater(H1) m

‘1

‘Variesbetweencassettes,and2.

Figure 3-47

I

0 Separation Delay Jam

Themicroprocessor identifies aseparationdelay jam if the paper fails reach the separation sensor m

‘1

I

(

(

(Q5)withinaspecifictimeaftertheregistrationclutch

(CL3) goes ON.

separation sensor (as)

Figure 3-48

COPYRIGNT @ 1992 CANON ING.

CANON NPZl20/2U20 RN.0 MAY 1990 PAINlEO IN JAPAN IIMPNIME AU JAPONI

3-49

OPERATIONSANDTIMING

@ Separation Stationary Jam

The microprocessor identifies a separation stationary jam if the paper fails to move past the separation sensor within a specific time after the separation sensor (Q5) detects the paper.

@ Delivety Delay Jam

The microprocessor identifies a delivery delay jam if the paper fails to reach the delivery sensor

Figure 3-49 within a specific time after the separation sensor

(Q5) detects the paper.

Jam check

3-50

Figure 3-50

CUPYRIGNT 0 1992 CANON ING.

CANON NPZl20/2MO NN. MAY 1990 PAINTEO IN JAPAN IIMPNIME AU JAPONI

..,.,

@ Delivety Stationary Jam

The microprocessor identifies a delivery stationary jam if the paper fails to move past the delivery

OPERATIONSANDTIMING sensorwithinaspecifictimeafterthedeliverysensor

(SWB) detects the paper.

Figure 3-51

COPYNIGHI 0 1592 CANON INC.

C A N O N NP2,20/2MO RN.0 MAY 1990 PNINTEB IN JAPAN IIMPRIML AU JAPOM 3-51

v. PQWEW SUPPLY

A. DC Power Supply

1. Mechanism

The DC power supply PCB is supplied with AC powerwhenthedoorswitchandPOWERswitchare turned ON.

On the DC power supply PCB, the AC power is rectiiied and smoothed out. lts voltage then is lowered by the transformer (T201); thereafter, it is made available in 24V, 12V. and 5V by filters and regulator.

For 24V power, the output voltage is checked; it is fed back to the switching regulator (Q204) by way of a photocoupler (Q205) for stabilization.

5V power is stabilized by the regulator (Q207).

2. Protection Mechanism for Power Supply

Circuit

The DC powersupply is equipped with protection mechanisms to cut off the power should any of the loads suffer a shorl because of an error.

The protection mechanism for 24V power is the over-current detection mechanism in the switching regulator (Q204); upon activation, the circuit also cuts off 12V and 5V outputs. For 12V power, a current fuse serves to protect against an over-current.

The protection mechanism for 5V power makes use of the over-current detection circuit of the regulator(Q207);upon activation, theoutput ofonly5Vis cut off.

For24V power, an over-voltage protection circuit isadditionallyprovidedusing aZenerdiode(ZD201) and thyristor (Q208).

The output, after activation of these protection mechanisms, can be recovered by turning the door switch OFF, correctingthe relevant load, and turning the door switch ON once again.

If only 12V has been cut out, the door switch should be turned OFF, the relevant load should be corrected, fuse (FU202) should be replaced. and the door switch should be turned ON once again.

TL?01 D 2 0 4

Over-voltage protection circuit

24V

Q207

Q2Oi i

MIMD

Figure 3-52

3-52

COPYAIGHT Q 1992 CANON INC. C A N O N NPZl20/2MU RN.0 MAY 1930 PRINTEU IN JAPAN IIMPNIME AU JAPUNI d

B. DC Power Supplyfor Options

1. Mechanism

The DC power supply for options supplies the document feeder and sorter with 24V power.

The transformer (Tl 01) lowers the voltage of the

130 VDC from the copier and filters it to produce an output of 24 V. The output voltage is then checked and fed back to the switching regulator (0101) by way of a photocoupler (Q102) for stabilization.

2. Protection Mechanism

TheprotectionmechanismoftheDCpowersupply for options makes use of the over-current protection circuit inside the switching regulator (QIOI).

It is also equipped with an over-voltage protection circuit identical with that for the DC power supply of the copier itself.

The output. after activation of the protection mechanism, can bereturnedbyturningoffthepower, correcting the relevant load oftheoption, and turning the power ON once again.

r----

----

~ 2

QlOl

Tl01

Over-voltage detection circuit

I

I l

I

I l

I i24V

I

I

A GND

I

I

1 DC power supply for options

LP--- -----------1

Figure 3-53

COPYNIGHT C 1592 CANON INC.

CANON NP2120/2020 NN. MAY 1990 PRINTEO IN JAPAN [IMPRIME AU JAPONI d

3-53

OPERATIONSANDTIMING

POWER

’ SUPPfY

24V

12v

5 v

COrltrOller

PCB nti-condensaion h e a t e r 100~ on,y

Drum heater 100/22ov only

Fixinq heater

cl

Scanning lamp )

24V

5 v

Paper dack pedestal

3-54

1 ------.

.-

L-----

------/--iEq

Figure 3-54

COPYNIGNT 8 1992 CANON INC.

CANON NP2l20/2MO RN.1 OEC. 1592 PNINTfU IN JAPAN UMPNIME AU JAPONI d

A. Outline

The service modes are available foruse in adjusting and checking some of the sensors and loads and can be activated by pressing the service switch

(SWI) on the adjustment PCB. See the table below fordescriptionson each of the seven service modes.

Service mode No.

0

1

2

3

4

5

6

7

Description AdjustmentChecks

The scanner movesforward to the pointof AE Use it to adjust the AE referente point; for measurement, and the scanning lamp goes details, see p. 3-34.

ON; the output voltage of the AE sensor is indicated on the copy counter on the control panel.

EX. 1561.5V

The read-involtage of VR2 (AEslope adjustUseittoadjusttheAEslope;fordetails, see ment) is indicated on the copy counteron the p. 3-35.

control panel.

EX. 22 0 2.2V

The powerfrequencydata is indicated on the The copier uses an AC motor; the variation copy counter on the control panel.

in its rotation speed caused byfluctuations

EX. -05 Q 59.5Hz

in the frequency can bring about expansionlcontraction of the image; use it to check such problems.

The pre-exposure lamp and main motor are Use it to check the operation of the lamp driven.

and motor.

All LEDs on the control panel go ON.

Use it to check the LEDs.

The output voltage of ‘document size 0’ is Ifanyofthefollowing istrue.anerrorshould

indicated on the copy counter on the control be suspected; replace the document size panel.

EX. 180 1.8V

detection mechanism (no adjustment is possible in the field).

* The value indicated with the copyboard

The output voltage of ‘document size 1’ is cover closed is 20 or less.

indicated on the copy counter on the control . The value indicated with the copyboard panel.

EX. 18 0 1.8V

cover open is 30 or more.

The output voltage of ‘document size 2’ is indicated on the copy counter on the control panel.

EX. 18 9 1.8V

COPYAIGNT Q IW CANON ING.

CANON NPZl20/2MD RN.1 JAN. 1992 PRINlED IN JAPAN IIMPRIML AU JAPONI d

3-55

OPERATIONS AND TIMING

B. Using the Service Mode

1) Remove the adjustment cover found below the left cover (rear).

4) Enter the No. of the desired service mode using the tenkey pad on the control panel.

* EX.: If ‘0’ is entered, the indicator indicates ‘0’.

5) Press the SORT/GROUP key on the control panel; this activates the service mode.

6) PresstheSORT/GROUPkeyonceagaintostop execution of the service mode.

7) Press the service switch (SWl) on the adjustment PCB to leave the service mode.

- The copier may also be turned OFF to leave the service mode.

8) Attach the adjustment cover.

Figure 3-55

2) Check that the COPY START key is green.

3 ) Presstheserviceswitch(SW)ontheadjustment

PCB.

L

3-56

Figure 3-56

COPYRIGHT 0 1992 CANON INC.

CANON NPZl20/2GZG RN.0 MAY 1990 PAINTEG IN JAPAN [IMPRIME AU JAPONI

7x-l OPERATIONS AND TIMING KZZ3 of the copier as necessary and, if it finds an error, it indicates an error code on the copy counter on the control panel.

See thetable belowfordescriptionsof each ofthe error codes; for EOOO, ‘E’ and ‘000’ are flashed alternately.

The copier’s microprocessor is equipped with a mechanism to check its condition (sensors, in partitular). The microprocessor monitors the operation

Error code r n m b7

-aa-

‘- ’ ” ” ’ r bm7 t b= b,( )A (

1’ b7 7n

,= b,( =0-t

Cause Description

- Thermistor (THl: poor contact or The output of TH1 fails to reach lOO%/ open circuit) 212°F within 1 min after power-on.

- Heater (Hl ; open circuit)

- Thermoswitch (TSl; faulty)

- SSR (faulty)

- DC controller PCB (faulty)

The output of TH1 exceeds 220°C/4280F.

- Thermistor (THI; shon circuit)

: %cr%%~r PCB (faulty)

- SSR (faulty)

- DC controller PCB (faulty)

- Fixing heater (open circuit)

- Counter (CNTl ; open circuit)

- DC controller PCB (faulty)

- SSR ON is detected while HTRD is OFF immediately after power-on (about 3 sec).

- SSR ON is detected continuously for 3 sec or more while HTRD is OFF.

- Normal if the check signa1 is ‘0’ immediately beforethe countergoes ON, when the COPY START key is pressed, or at power-on.

- Scanner motor (M2; faulty)

- DC controtler PCB (fautty)

- The scanner initial operation is no! over within 15 sec at power-on.

- Scanner home position sensor - The AE reverse operation is not over

(04; faulty) within 15 sec.

* The reverse operation is not over within

10 sec after exposure.

All keys on the control panel will be locked without error code indication.

- Lens home position sensor

(Ql; faulty)

- Lens motor (M3; faulty)

- Lens wire (faulty)

- DC controller PCB (faulty)

- Blank shutter home position sensor (Q2; faulty)

- Blank shutter drive wire (faulty)

* The lens is not set to the DIRECT position within 20 sec after initial rotation is started.

- The lens is not set lo the specified reproduction ratio position within 20 sec after the COPY START key is pressed.

* The blankshutter home position sensor

(Q2) does not detect the blank shutter within 20 sec after the commencement of initial rotationoraftertheCOPY SART key has been pressed.

* Lamp regulator (faulty)

- DC controller (faulty)

The zero cross signa1 (ZXDP) has fluctuated.

COPYAICHT G 1992 CANON ING.

CANON NPZl20/2020 RN.2 OEC. 1952 PRINTEO IN JAPAN IIMPAIME AU JAPONI d

3-57

Error code Cause Description

- ADF controller (faulty)

- ADF power supply (faulty) b’ b 4 b’1 b7 - ADF sensors (faulty)

- DC controller (faulty) b= 7bLtb,(

0 An error in communication with the ADF cannot be cleared.

- The sensor output within the ADF has an error.

(If the ADF is faulty, only ‘E400’goes ON; therefore, check the communication line and sensors and motor in the ADF.)

-

b7bTbZ 3

- Softer controller (faulty)

- DC controller (faulty) bA b-t A A

An error in communication with the sorter cannot be cleared.

- DC controller PCB (faulty) The IPC (Q304) cannot be initialized attime

- Connector (wl option; poor con- of power-on.

tact)

Note:

The copier can be reset by turning it OFF and then ON when its self diagnostic mechanism has been activated. If ‘EOOO’ is indicated, however, the copier cannot be reset this way.

This is a consideration against damage lo the fixing rollerfrom over-heating when the thermistor fails to serve its purpose.

To clear ‘EOOO’, perform the following:

1) Remove the adjustment cover.

2) Turn the power OFF.

3) Press the setvice switch (SWI, on the adjustment PCB.

4) Tum the power OFF and ON.

3-58

COPYRIGNT c 1992 CANON INC.

CANON NPZl20/2MO MN.1 OEC. 1992 PAINTEO IN JAPAN IIMPAIME AU JAPGNI

CHAPTER 4

MECHANICAL SYSTEM

1. Disconnect the power cord for safety before disassembly or reassembly work.

2. Group the screws by type (length and diameter) and location.

3. The fixing screw for the grounding wire and varistors is fitted with a washer to ensure electric conductivity; be sure to use the washer for reassembly.

4. One of the mounting screws of the rear cover is fitted with a washer to protect against static electricity; be sure to use the washer for reassembly.

5. If possible, avoid operating the printer with any of íts parts removed.

6. Unless otherwise noted, reassembly is the reverse of disassembly.

7. Take care not to bend the contact springs or soil contact surfaces; clean the contacts using an alcohol solution if they are soiled.

1.

EXTERNALS ........................................ 4-1

A. Externa1 Covers ............................... 4-I

B. Control Panel ................................... 4-4

C. Copyboard Cover.. ........................... 4-4

D. Fans.. ...............................................

4-5

II.

DRIVE SYSTEM ................................... 4-7

A. Lens Dríve Unit ................................ 4-7

B. Scanner Drive Unit.. ......................... 4-9

C. Main Motor Unit ............................... 4-12

III. FEED SYSTEM .................................... 4-13

A. Pick-Up Unit ..................................... 4-13

B. Feeder Unit ...................................... 4-16

COPYAIGNT 0 1992 CANON ING.

IV.

V.

VI.

VII.

EXPOSURE SYSTEM .____._,........,___,.,... 4-18

A. Illuminating Unit . ..__._......____...........

4-18

B. Blank Exposure Unit __.______.._,.,_____.... 4-19

CORONA SYSTEM ____..__._.,._.__............. 4-21

A. Drum Unit .

4-21

B. Primary and Transfer Corona Units 4-22

DEVELOPMENTSYSTEM _.________._______. 4-25

A. Developing Assembly _._,_.__..._.________

4-25

FIXING SYSTEM .__...___.._..._____.............. 4-28

A. Fixing Assembly .._...........................

4-28

CANON NPZWZMO RN.0 MAY 1990 PAINTEG IN JAPAN IIMPRIME AU JAPGNI

M E C H A N I C A L S Y S T E M W

NP2020

NP2120

Figure 4-l

NP2120

@ Copyboard cover

@ Left cover

@ Delivery cover

@ Copyboard glass

@ Control panel

@ Front door

Figure 4-2

Q Cassettes

@ Lower front cover

@ Right cover

@ Upper rear cover

0 Rear cover

@I Multifeeder

Remove the covers as necessaty for cleaning, inspecting, or repairing the inside of the copier.

Covers that can be detached by mere removal of the screws are leff out of the procedure.

COPYAIGHT 0 1992 CANON INC.

CANON NPZIZOUXO REY.1 OEC. 1992 PAINTED IN JAPAN [IMPRIME AU JAPONI

4 - l

MECHANICALSYSTEM

Note:

Make sure that the copier is closed before removing the copyboard glass. Use an alcohol solution to clean the copyboard glass; the use of a solvent can corrode the white paint along the right edge of the glass.

1.

1)

Rear Cover

Remove the air filter.

* Hook in A * Hook in C

Figure 4-5

- Hook in B

Upper rear COYer

@ Air filter covef

@ Air filter

Figure 4-3

2)

3)

Remove the four mounting screws.

Move the rear cover down until the four hooks are disengaged; thereafter, move it up to remove.

Figure 4-6

Figure 4-4

4 - 2

COPYNIGHT 0 1592 CANON INC.

CANON NPZl2012MO REY.1 OEC. 1992 PAINTEO IN JAPAN [IMPRIME AU JAPON)

Inside Covers (left, right)

Remove the inside cover (fixing assembly knob; left); be sure to remove the ozone filter holder in advance.

Remove the inside cover (right); be sure to remove the drum unit and developing assembly in advance.

4 . Leff Cover

1) Remove the rear cover.

2) Remove the four mounting screws.

J

@ Inside cover (right) @ Drum unit

Q Inside cover (left) @ Developing assembly

@ Ozone filter holder @ Fixing assembly knob

Figure 4-7

3. Lower Front Cover

1) Remove the lower front cover; three mounting screws.

Il

@I Left cover

0 Mounting screws

Figure 4-9

3) Detach the left coverfrom the lower front cover.

0 Mounting screws 0 Lower front cover

Figure 4-8

@ Left cover

0 Lower front cover

Figure 4-10

COPYAIOHT 0 1992 CANON INC.

CANON NPZlZO/ZMO RN.1 OEC. 1592 PRINTEO IN JAPAN IIMPAIME AU JAPONI

4 - 3

W MECHANICALSYSTEM

4)

Move the left cover up to remove.

5. Right Cover

1) Remove the rear cover.

2) Loosen the two mounting screws of the copyboard glass retainer, and remove the four mounting screws of the right cover.

0 Left cover

Figure 4-11

- Cross Section of A

Lencover

NP2020

Copierframe Copybard glass retainer

Figure 4-12

Note:

If a sorter (sorter-Al) is attached, pull up

the

left cover to remove.

NP2120

@ Mounting screws (copyboard glass retainer)

Q Mounting screws (right cover)

@ Right cover

Figure 4-13

3) Open the front right door

4) Open the right door lo remove: be careful with the lower front cover.

4-4

COPYAIGHT 8 1992 CANON INC.

CANON NPZlZO/ZMO REY.1 OEC. 1592 PniHno IN JAPAN IIMPAIME AU JAPONI

@ Right cover

Q Lower front cover

@ Engagement

Figure 4-14

B. Control Panel

1) Remove the inside cover.

2) Remove the five mounting screws and grounding wire. and pull the control panel up to remove.

C. Copyboard Cover

1. Replacing the Contact Sheet

The contact sheet is attached to the copyboard retaining plate using tape; pull on its corners to remove.

After attaching a new sheet, press over the sheet to even it out.

D. Fans

1. Outline

The copier is equipped with three fan motors which serve to circulate the air inside the machine.

Each of these fans serves the following purpose:

- Scanner cooling fan (FMI): cools the scanner;

- Feeder fan (FM2): moves copy paper;

- Exhaust fan (FM3): directsthe airto theoutside of the copier.

Figure 4-16

@ Mounting screw

@ Control panel

@ Grounding wire

Figure 4-15

COPYAIGNT G 1992 CANON INC.

CANON NPZlZO/ZMO MV.1 OEC. 1992 PAINTEO IN JAPAN [IMPRIME AU JAPON,

4 - 5

RZ?B MECHANICALSYSTEM

2. Scanner Cooling Fan

1) Remove the rear cover.

2) Disconnect the connector (J63).

3) Remove the three mounting screws, and remove the fan.

. ..*I.

,-. c c .? r .-,.

3) Open the front door. and remove the ozone filter and inside cover(lef&; thereafter, lowerthefeed unit.

4) Put a hand under the exhaust fan unit, remove the two mounting screws, and pull it out to the front with care.

0 Scanner cooling fan

@ Connector (J63)

0 Mounting screws

3. Exhaust Fan

Figure 4-17

1) Remove the rear cover.

2) Disconnect the connector (J37), and remove the mounting screw.

0 Mounting screws 0 Exhaust fan

Figure 4-19

4. Feeder Fan

To remove the feeder fan, see p. 4-17

0 Mounting screw

0 Connector (J37)

0 Scanner cooling fan

Figure 4-18

4 - 6

COPYRIGHT 0 1992 CANON INC.

CANON NP2120/2MO REY.1 OEC. 1992 PNINTEO IN JAPAN IIMPAIME AU JAPONI

Ba. Lens Drive Unit

1. Outline

The lens drive system serves to drive both the lensandblankexposureshutter; thedriveisswitched by the blank shutter solenoid (SL4).

Lmddrive motor

MECHANICALSYSTEM

1-1 : lensdiveunitisshownasshaded.

Figure

4-20

COPYNIGHT 0 1592 CANON INC.

CANON NPZl20Q~O MV.0 MAY 1930 PAINTEO IN JAPAN (IMPnIM[ AU JAPON]

4 - 7

MECHANICALSYSTEM

2. Lens Drive Unit

1) Remove the lamp regulator

3) Slide the scanner motor somewhat, remove the twomountingscrews,disconnecttheconnector, and remove the lens drive unit.

0

Lamp regulator

Locking supports

Figure 4-21

2) Remove the four mounting screws of the scanner motor; take careto keep the scanner drive cable intact.

@ Lens drive unit

Q Connector

@ Mounting screws

Figure 4-23

3. Lens Cable

Route the lens cable as shown in Figure 4-20.

0

Scanner motor

Mounting screws

Figure 4-22

4 - 8

COPYRIGHT G 1542 CANON ING.

CAWON NPZl20/ZMO REY.0 MAY 1990 PRINTED IN JAPAN [IMPRIME AU JAPONI

B. Scanner Drive Unit

Screw A

Scrèw B

1. Detaching the Scanner Cable

1) Mark the position of the fixing plate using a scriber, and loosen two screws B, which hold the fixing plate in place.

2) Loosen screw A, and detach the scanner cable.

Figure 4-24

2. Attaching the Scanner Cable

1) Route the cable as shown in Figure 4-24.

2) Turn screw Ato adjust the position of the fixing plate; align it with the line drawn using a scriber.

3) Tighten screw B.

COPYRIGHT G 1992 CANON ING.

CANON llP2120/2020 RN.0 MAY 1930 PAIHTEO IN JAPAH IIMPAIME AU JAPONI

4 - 9

3. Adjusting the Scanner Driver Cable

Move the No. 1 mirror mount to the home (start) position, pull the cable using a spring gauge (A in

Figure 4-25), and turn screw A so that the reading of the gauge is about 1 .O fo.05 kg.

scanner pulley

N o . 1 No. 2 and mirror 3 mirror mount mounts

Figure 4-25 (viewed from above)

4. Adjusting the Mirror Position

(optical length between Mo. 1 and 2

Mirrors)

Adjust the relative position of the mirrors when the mirror drive cable has been re-routed.

Theposition can be adjusted by moving thefixing used for the No. 1 mirror mount; loosen the hex screw.

Note:

i.

The cable tends to become slack as copies are made, necessitating adjustment of its tension.

ii. If the optical distance between the No. 1 and 2 mirrors is not correct, the horizontal reproduction ratio will not be correct and, at the same time, images will be out of focus.

1) Draw lines on copy paper (A4, A3, LTR, or 11” X

17”); 1 cm/0.4 inch from each end as shown in

Figure 4-26.

7 pi cml0.4 in 7 i-lcml0.4in

Figure 4-26

2) Use the paper marked with lines as the document, and make a copy; A.

3) Place a blank sheet of paper on the copyboard, and feed the paper marked with lines in the manual mode: B.

4-l 0

COPYRIGHT 0 1992 CANON INC.

CANON NP2l20/2@20 RN.1 JAN. 1592 PAINTED IN JAPAN IIMPAIME AU JAPONI

W The paper paper will show contraction caused by heat after it has gone through the copier.

4 ) PlacepaperAandpaperBtogetheralignedover the left lines, and adjust the No. 1 mirror mount so that distances x and y in Figure 4-27 are

M E C H A N I C A L S Y S T E M m

5. Lubrication

Clean the scanner rail; thereafter, apply lubricant evenly along the rail.

- Copied (A)

- Fed (B)

Figure

4-27 x=y

X’Y

X<Y

Correct.

Move the No. 1 mirror mount in the direction of a.

Move the No. 1 mirror mount in the direction of b.

Note:

IfthedistancebetweentheNo. 1 and2mirrors is too short, the copy image will be enlarged and if too long, reduced.

No. 1 mirror mount

Mirror drive cable

COPYRIGNT 0 1992 CANON INC.

CANON NPZlZWZMO RN.0 MAY 15’30 PAINTEO IN JAPAN (IMPRIME AU JAPONI

4-11

an MECHANICALSYSTEM

C. Main Motor Unit

1.

Removíng the Main Motor

1)

2)

Remove the fixing assembly; see p. 4-28.

Remove the motor driver PCB; two mounting screws, five connectors.

2. lblounting the Main Motor

The drive of the main motor is used to drive the drum and execute pi&up operations by way of timing belts.

To adjust the tension of the timing belt used to drive the drum, push the center of the belt using a spring gauge with a forte of 500 g. and select the main motor mounting holewhich enables the top and bottom of the belt to be 20 to 25 mm; see Figure 4-

30.

Main motor mounting hale

To loosen.

To tighlen.

0

0

Motor driver PCB @ Connectors

Mounting screws

Figure 4-28

3)

4)

Remove the connector (J62).

Remove the four mounting screws; move the mainmotortothe leftasfaras it goes, detachthe belt, lift, pull toward the front, and remove the main motor.

Main motor

Figure 4-30

To adjust the timing belt used to execute pick-up operations. on the other hand, push the idle supporl plate with a forte of 400 Cl00 g, and fix it in place when it stops; see Figure 4-31.

0 Mounting screws

@ Main motor unit

@ Connector (J62)

Figure 4-29

4-12

Idle support plate pi&up operation

Figure 4-31

COPYRIGHT 0 1992 CAHON INC.

CANON NPZl20/2MO RN.0 MAY 19917 PNINTEO IN JAPAN IIMPRIME AU JAPONI

A. Pick-Up Unit

1.

Pick-Up Roller Shafts (upper, lower)

1)

Remove the lower front cover.

2) Remove the shaft flange, and remove the pickup roller shaft.

Pick-Up Roller

Detach the pick-up roller from the pick-up roller shaft.

Detach the rubber from the pick-up roller: see

Figure 4-34.

Rubber on pick-up roller

Figure 4-34

0

0

0

Shaft flange

Mounting screw

Pick-up roller shaft

Figure 4-32

3)

Detach the pick-up roller from the pick-up roller shaft.

Pi&up roller shaft

Positioning the Pick-up Roller

See Figure 4-35 when mounting the pick-up roller on the ijpick-up shift; be sure to use the correct mounting hale.

(front)

Pi&up shaft

(mar)

Mounöng hale for inch system

ú

0 0 OO QOP t f

Mounting hale

/ for metric system l

No pick-up roller for inch system; use it for metrfc system only.

No notes are given atmve for mounöng boles lo be used in common in metdc and inch systems alike.

Figure 4-33a (viewed from above)

Flgure 4-35

Pi&up roller shaft

Figure 4-33b (viewed from above)

COPYRIGHT 0 1592 CANON ING.

CANON NP2120/2MO RN.0 MAY 1990 PRINTEO IN JAPAN IIMPAIME AU JAPONI

4-13

4. Registratíon Roller

1) Remove the

rear cover.

2) Disconnect the connector, remove the grip stop ring, and remove the registration clutch.

6 ) RemovetheE-ring,tensionspring,andbushing, and remove the registration roller.

0 Connector

@ Grip stop ring

0 Registration clutch

Figure 4-36

3) Remove the spacer E-ring, and tension spring

@ E-ring

@ Tension spring

@ Bushing

@ Registration roller

Figure 4-38

co-

@ E-ring

0 Tension spring

@ spacer

Figure 4-37

5) Open the front door, and remove the inside covers (left, right).

4 - 1 4 COPYAIGHI Q 1992 CANON ING.

CANON NP2,20/2020 RN.0 MAY 1990 PAINTED IN JAPAN IIMPAIME AU JAPONI

5.

Feeder Rollers (1, 2)

1)

Remove the feeder rollerclutch using a hex key.

6. Manual Feed Pick-Up Woller (NP2020)

1) Remove the right cover.

2) Remove the manual feed pick-up unit; two mounting screws, one connector.

0”

Feeder roller clutch

Hex key

Figure 4-39

2) Remove the E-ring and gear; be careful with the parallel pin.

@ Manual feed pick-up unit @ Connector

0 Mounting screw

Figure 4-42

3)

4)

0

E-ring

Gear

Figure 4-40

Figure

4-43 Manual Feed Pick-Up Unit

3) Remove the E-ring and bushing, and removethe manual feed pi&up roller.

@ E-ring

0 Manuaal feed pick-up roller

Figure 4-44

@ E-ring

@ Bushing

Figure 4-41

COPYAIGNT 62 1992 CANON INC.

CANON NPZl20/2MO REY.0 MAY 1590 PAINTEO IN JAPAN [IMPRIME AU JAPONI 4 - 1 5

7. Betaching the Multifeeder (NP2120)

1) Detach the copier’s right cover.

2) Remove the three jacks.

8. Detaching the Wlultifeeder Separation

Pad (NP2120)

1) Detach the right cover.

2) Remove the screw, and detach the separation pad together with its mount.

@ Jacks

Figure 4-44a

3) Remove the four screws, and detach the multifeeder assembly.

@ Screw

@ Mount

Figure 4-441~

3) Take out the separation pad into the direction of the arrow.

Ql Screws

@ Multifeeder assembly

Figure 4-44b

@ Separation pad

Figure 4-44d

4-15a

COPYNIGHT 0 1592 CANON ING.

CANON NPZl20/2020 REY.0 OEC. 1592 PAINTEO IN JAPAN IIMPRIME AU JAPONI

9. Detaching the Multifeeder P i c k - U p

Roller (MP2120)

1) Detach the right cover.

2) Remove the screw, and detach the bushing; then, detach the roller cover.

MECHANICAL SYSTEM E?I3

4) Detach the pick-up roller togetherwith its shaft.

0

@ Pick-up roller

Figure 4-4421

@ Bushing

Q Roller cover

Figure 4-44e

3) Remove the E-ring (plastic), and move the busing in the direction of the arrow.

@ E-ring

Q Bushing

Figure 4-441

COPYAIGNT 0 1992 CANON INC.

CANON NP2l20/ZMO AN. OEC. 1592 PAINTEG IN JAPAN [IMPRIME AU JAPON)

4-15 b

w MECHANICALSYSTEM

B. Feeder Unit

1. Feeder Unit

Note:

Make sure that the drum unit, transfercorona unit, and developing assembly are removed before removing the feeder unit.

1) Relpace the feeder unit.

2) Remove the main motor unit.

3) Disconnect the connector (J309) from the DC controller PCB, and remove the grounding wire.

4) Remove the insioe leftcover, and remove the Ering and bushing.

@ E-ring

@ Bushing

Figure 4-47

5) Lift the fixing assembly side of the feeder unit, and pull it toward the front to remove.

Q

@ Grounding wire

@ Connector (J309)

Figure 4-45

3) Remove the E-ring and the bushing.

/ ’

@ Feeder unit

Figure 4-48

@ E-ring

@ Bushing

Figure 4-46

4-l

6

COPYRIGHT 0 1992 CANON INC.

C A N O N NPZl20/2Wl KV.0 MAY 1590 PAINTUI IN JAPAN IIMPAIME AU JAPONI

2. Feeder Belt

1) Remove the feeder unit.

2) Remove the two screws from the front, and remove the screw mount, brushing, lead screw, and gear..

4)

5)

6)

7)

Disengage the hook, and remove the motor cover.

Remove the four fastons from the microswitch.

Remove the screws at the rear, and remove the corona unit rail.

Detach the feeder belt.

-0

43

@ Mounting screw

@ Transfer corona unit rail

@ Screw mount

@ Lead screw

@ Bushing

Figure 4-49

3) Remove the three screws, and remove theelectrode holder at the rear.

0

Feeder belt

Figure 4-51

3.

Feeder Fan

1)

2)

Remove the two feeder belts.

Disconnect the connector, disengage the hook.

and remove the feeder fan.

@ Electrode holder

@ Mounting screws

Figure 4-50

Feeder fan

g

Hook

@ Connector

Figure 4-52

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CANON NPZl20/2MO AEV.0 MAY 1590 PRINTEU IN JAPAN IIMPAIME AU JAPONI 4-l 7

-.:

IV. EXP YSTEM

A. Illuminating Unit

1.

Remowing the Scanning bamp

1)

2)

3)

Disconnect the power plug.

Remove the copyboard glass.

Remove the mounting screw, and remove the light shutter.

Note:

i.

Wait until the scanning lamp has cooled before starting the work.

ii. Do not leave finger prints on the scanning lamp.

iii. Dry wipe the scanning lamp if it is soiled.

2. Remowing the Thermal Fuse

1) Remove the control panel, and remove the copyboard glass.

2) Hold the rear side of the No. 1 mirror unit, and move it to the right as shown in Figure 4-55.

Note :

Be sure to hold the rearsídewhen moving the

No. 1 mirror mount.

@ Mounting screws

@ Light shutler

Figure 4-53

4) Push the lamp electrode plate (rear) in the direction of the arrow. and remove the scanning lamp.

/

0

\

0

@ Mounting screw

@ Thermal fuse

@ No. 1 mirror mount

Figure 4-55

3) Remove the two mounting screws, and remove the thermal fuse.

@ Lamp electrode plate (rear)

0 Scanning lamp

Figure 4-54

4-l 8

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CANON NPZl2012020 RN.0 MAY 1990 PRINTEO IN JAPAN IIMPRIME AU JAPONI

MECHANICALSYSTEM m

B. Blank Exposure Unit

1. Construction

2.

Re-Exposure P C B

1) Remove the rear cover.

2) Disconnect the connector (J731) from the preexposure PCB.

3) Hold thepre-exposure PCB using a wrench, and pull it straight up; take care not to damage the

PCB and elements on it.

3.

Blank Exposure Unit

1) Remove the copyboard glass, lens cover, rear cover, drum unit, and developing assembly.

2) Mark the blank exposure shutter home position sensor on the lens mount using a scriber, and remove it.

J

I

@ Connector @ HVT

Figure 4-58

4) Holdtheblankexposureunitfrombelow, remove thethreemounting screws, andpull ittothefront to remove.

@ Sensor

Figure 4-57

3) Disconnect the connector (J731) from the preexposure PCB.

0 Mounting screws

Figure 4-59

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CANON NPZl20/2MO AN. MAY 1990 PRINTEG IN JAPAN IIMPAIME AU JAPONI 4-l 9

Using the Mirror Cleaning Tool

No. 6 mirror cleaning unit

Put the mirror cleaning tool against the No. 5 mirror as shown in Figure 4-62, and clean the mirror by sliding the tool.

No. 4 mirror

Figure 4-60

Cleaning the No. 5 R%irror

Remove the copyboard glass and lens cover, andremovethemirrorcleaning toolfromthelens mount; one screw.

Remove the lens cover, and insert the mirror cleaning tool as shown in Figure 4-61.

M~rror cleaning 1001

Figure 4-62

Cleaning fhe No. 6 Mirror

Remove the drum unit, developing assembly, and dust-proof glass.

Put the mirror cleaning tool against the No. 6 mirror as shown in Figure 4-63, and clean the mirror by sliding the tool.

No. 5 mirra

Mirror cleaning bol

Figure

4-61

No’gap.

Figure 4-63

4 - 2 0 COPYRIGNT 0 1932 CANON ING.

C A N O N NP2,20/2020 RN.0 MAY 1990 PRINTEO IN JAPAN IIMPAIME AU JAPON)

A. Drum Unit

1. Removing the Drum Unit

1) Open the front door, and remove the knob.

MECHANICALSYSTEM

2. Cleaning

lfthe photosensitivedrum is soiled, clean it using a flannel cloth coated with toner; do not use paper, ling-free or otherwise.

Note:

Do not use solvents to clean the drum; or, do not use cleaning powder.

@ Drum unit @ K n o b

@ Developing assembly

@ Developing assembly release lever

Figure 4-64

2) Turn the developing assembly release lever counterclockwise.

3) Pull the drum unit to the front to remove.

Note:

Take care not to damage the drum.

The photosensitive drum is susceptable to light; if exposed to room light, the drum can cause white spots or black lines on the copies.

As a rule, the copier should never be turned ON withthedrumunitremoved;otherwise,theregistration roller and transfer guide may interfere, and the registration roller can be damaged by the transfer guide during warm-up rotation.

Note:

Do not press the COPY START key.

COPYAIGHT 0 1992 CANON ING.

CANON NPZl2tWU20 KV.0 MAY 1590 PNINTEO IN JAPAN IIMPAIME AU JAPONI 4-21

B. Primary and Transfer

Corona Units

1. Outline

The photosensitive drum is surrounding by the primary and transfer corona units.

The primary corona unit is equipped with a grid plate.

2. Disassembly and Assembly

a. Primary Corona Unit

1) Remove the drum unit

Note:

If exposed to strong light for a long time, the photosensitivedrumcancausewhitespotsor black lines on the copy images; take extra careto protect it from light.

2 ) Disengagethetwohooks,andpuIIouttheprimary corona unit from the drum unit b. Transfer Corona Unit

1) Remove the transfer corona unit cover,and remove the transfer corona unit.

@ Transfer corona unit cover

0 Mounting screw

Figure 4-66

2) Pull out the static eliminator.

@ Hooks 0 Primary corona unit

Figure 4-65

0 Transfer corona unit

@ Static eliminator

Figure 4-67

3) Disengage the three hooks, and remove the guide wire retainer.

4-22

COPYAIGNT Q 1992 CANON ING.

@ Transfer corona unit @ Gide wire

@ Gide wire retainer

Figure 4-68

CANON NPZl20/2MO RN.0 MAY 1990 PAINTEO IN JAPAN IIMPAIME AU JAPONI

c.

Attaching the Corona Wires for the Primary and

Transfer Corona Units n Primaty Corona Unit

1) Remove the four tension springs and grid plate.

4) Cutofftheend(excess)ofthecoronawiretoless than 1 mm using a nipper.

5) Hook the loop of the corona wire as shown in

Figure 4-70, and fit the wire along the V-groove of the height adjusting block.

Hook the corona wire tension spring on the corona wire, and turn the spring three to four times as shown in Figure 4-70.

@ Grid plate tension spring 0 Grid plate

Figure 4-69 n Transfer Corona Unit

2) Remove the guide wire retainer; see p. 4-22.

3) Loosen a length of about 40 mm of corona wire from a 0.06-dia. wire reel, and form a loop at the end with a diameter of about 2 mm.

Note:

To form a loop, wind the corona wire around a hex key once, and turn the key four to five times; thereafter, twist the wire.

Figure 4-70

6) Cutofftheend(excess)ofthecoronawiretoless than 1 mm using a nipper.

7) Pick the end of the corona wire tension spring using tweezers, and hook it on the corona electrode.

Note:

n Check that the corona wire is free of twist and its gold-plating is intact.

w Checkthat thecorona wire is taut; correct, if the length of the tension spring is about

12 mm.

n Check that the corona wire is fitted along theV-grooveofthe heightadjustingblock.

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CANON NPZf20/2MO RN.0 MAY 1990 PRINTED IN JAPAN IIMPRIME AU JAPONI

4-23

3. Mounting the Transfer Corona Unit

1) Check that the wire cleaning mount is at the home position.

@ Wire cleaning mount

Figure 4-71

2) Movethewirecleanerofthetransfercoronaunit by hand to the front.

3) Slidethetransfercoronaunit intothecopier, and check that the pins of the wire cleaner are inside the wire cleaner unit.

4) Mount the transfer corona unit cover.

1

If the wire cleaner mount is not at the home position. perform the following:

The wire cleaner mount stops where it is as soon as the copier is turned OFF during cleaning operation; in such cases, work as follows:

2)

3)

1)

Movethewirecleanerofthetransfercoronaunit by hand to the rear as far as it goes.

Mount the transfer corona unit.

TurnthepowerON withthefeederunit released.

and check that the wire cleane returns to the home position.

Note:

The step given above is for when the cleaning motor is in good condition; if the motor is not in good condition or if the wire cleaner mount faifstoreturnto the homeposition becauseof displaced screws, the COPY START key on the control panel remains red. As such, if the key remains red after the wait period, check the cleaning motor.

4 - 2 4 COPYRIGNT 0 1592 CANON ING.

CANON HPZIZORMO RN.0 MAY IV30 PRINIEO IN JAPAN IIMPRIME AU JAPONI

Ea. Developing Assembly

1. Construction

MECHANICALSYSTEM

3.

Removing the Blade, Developing

Cylinder, and Side Seal

1)

2)

Remove the developing assembly from the copier.

Remove the two screws, and remove the developìng assembly upper cover.

-

Side seal stirn!ng rod

Figure 4-72

Removing the Developing Wssembly

Turn the developing assembly release lever counterclockwise.

Slide the developing assembly with care.

Hold the grip of the developing assembly, and remove it from the copier.

0

Screws

Developing assembly upper cover

Figure 4-74

3)

4)

Placea newspaper on the floor, and empty the developing assembly of toner.

Remove the two screws, and remove the blade mount together with the mount.

@ Mounting screws

Figure 4-75

0 Developing assembly release fever

0 Developing assembly

Fiaure 4-73

COPYAIGNT G 1992 CANON ING.

CANON NPZl20/ZOi!O REi. MAY 1930 PRINTED IN JAPAN IIMPRIME AU JAPONI

4-25

5) Remove the hook, and remove the grip 9) Remove the two E-rings and two gears

Figure 4-76

6) Remove the three screws, and remove the developing cylinder holder (front), washer, and developing roll.

@ E-rings 0 Gears

Figure 4-78

10) Remove the two screws, and remove the developing cylinder holder (rear), ball bearing, and developing roll.

@ Developing cylinder holder

Q Developing ro11

@l Screws

Figure 4-77

@ Developing cylinder holder

@ Balf bearing

@ Developing roll

@ Screws

Figure 4-79

11) Remove the developing cylinder and side seal.

4-26

COPYAIGHT 0 1992 CANON ING.

CANON NPZlZO/ZMO KV.0 MAY 1990 PAINYEO IN JAPAN [IMPRIME AU JAPONI

4. Mounting the Side Seal and Blade

1) Clean the surface using an alcohol solution to prepare for the attachment of the side seal.

2) Attach the side seals at the locations shown in

Figures 4-80 and -81; short, then long seal.

Attach tie seal so that the long round hale of the end seal and the round hola of the developing assembly are matched.

MECHANICALSYSTEM s&%$$

3) Mount all parts except the blade.

For the gear, engage long tooth a and groove b to put the pieces together.

Figure

4-82

4) Push the blade mount against the developing cylinder in the direction of the developing assembly, and tighten the two screws.

Figure 4-80 (front view)

Note:

Attach the seal so that the long round hole of

‘the end seal and the round hole of the developing assembly are matched.

Figure 4-83

5) Loosenthefourscrewsthat holdthebladeon the blade mount, and re-tighten them.

Note:

Do not loosen the screws too much;otherwise, the blade may come off the positioning pin at the center.

Figure 4-81 (cross section)

Note: i Put the side seal (shon) and side seal (long) together as shown, and attach them around the developing assembly.

ii Make sure that the shorl and long seals are positioned as shown in Figure 4-81.

COPYRIGNT 6 1992 CANON INC.

CANON NPZf20/2CQO REY.1 JAN. 1592 PRINTEO IN JAPAN IIMPAIME AU JAPON]

4-27

NBBl MECHANICALSYSTEM

A. Fixing Assembly

1. Construction

Oil applicati0n roller

2. Remowing

the

Fixing Assembly

1) Open the front cover, and remove the fixing assembly knob.

Lower roller Paper guide

0

0

Fixing assembly knob

Mounting screw

Figure 4-65

2)

3)

4)

Remove the left cover.

Disconnect the three connectors.

Remove the two mounting screws, and slide out the fixing assembly.

Figure 4-84

@ Connectors

0 Mounting screws

Figure 4-86

4-28

COPYAIGHT 0 1932 CANON ING.

C A N O N NPZl20/2MO RN.0 MAY 1990 PAINTEO IN JAPAN IIMPRIME AU JAPONI

3. Fixing Heater

1)

Remove the fixing assembly.

2) Remove the two fastons.

M E C H A N I C A L S Y S T E M mm

4. Upper Fixing Roller

1) Hold the grip of the oil application roller, and pull to the front while lifting to remove the roller.

0

Fastons

4-n

I

, li

Figure 4-87

3)

Remove the mounting screw, and remove the heater mounting plate (front).

0 Oil application roller

Figure 4-90

2) Remove the fixing heater.

3) Remove the thermoswitch holder.

ó

Mounting screw

CD

Heater mount plate (front)

Figure 4-88

4)

Remove the mounting screw, and remove the heater mount plate (rear); thereafter, slide out the fixing heater.

@ Thermoswitch holder

Figure 4-91

4) Lift the clep, and remove the thermistor cover; then, remove the thermistor.

@I Mounting screw @ Fixing heater

@ Heater mount plate (rear)

@ Clip

0 Thermistor cover

@ Thermistor

Figure 4-92

COPYRIGHT 0 1992 CANON ING.

Figure 4-89

CANON NP2120,2020 RN.1 JAN. 1992 PAINTED IN JAPAN IIMPRIME AU JAPONI

4-29

5) Remove the C-ring, and remove the

gear.

8) Push the lower roller pressure spring at the rear of the fixing assembly, and pull

out

the upper fixingroller intothedirectionof the arrow (frontof fixing assembly).

@ C-ring @ Gear

Figure 4-93

6) Pushthepressurespringofthelowerfixing rolfer down (disengage), and remove the insulating bush and bushing.

@ Insulating bush

@ Bushing

@ Pressure spring for lower fixing roller

@ Screwdriver

Figure 4-94

7) Remove the C-ring at the rear of the fixing assembly, and remove the gear

Pressure spring for lower roller

Upper fixing roller

Figure 4-96 bower Fixing Roller

Remove the upper fixing roller.

Liftthelowerfixingrollertogetherwith thebushing to remove.

Mounting the Heater and Upper

Fixing Roller

Reverse the steps for mounting the heater and upper fixing roller with the following in mind.

a. Heater

@I Do not touch the heater.

0 Orient the heater so that the end with the manufacturer’s name is to the front.

b. Upper Fixing Roller

@ Keep the rofler wrapped in copy paper to protect against din and scratches.

@ Orient the upperfixing roller so that the end with two C-rings are to the rear.

@ C-ring

4-30

@ Gear

Figure 4-95

COPYAIGNT 0 1992 CANON INC.

CANON NPZlZO/ZMO RN.0 MAY 1990 PRINTEO IN JAPAN [IMPRIME AU JAPONI

7. Adjusting the Nip (tightening the pressure nut)

The nip width should be as shown in Table 4-l; otherwise, turn the bolt.

M E C H A N I C A L S Y S T E M m

8. Mounting the Thermistor

Check that the detection face of the thermistor is evenly in contact with the surface of the upper fixing roller.

Note:

The thermistor position need not be adjusted; if thecontact is not even, checkifthethermistor

Figure 4-97

Note: aandcrepresent apoint 15 mmfromthesides of the copy.

I

Dimension Nip’ b 0 kO.5 mm

la-cl I

0.5 mm or less 1

Table 4-1 l

With both upper and lower rollers adequately heated.

a. Measuring the Nip

If the roller is cool, wait for 15 minutes after the

WAITindicatorgoes green; make 20 copies, and take measurements.

1) Open the copyboard cover, and make a solid black copy in A3.

2) Switch the power OFF as soon as the leading edge of the copy comes out to the copy tray; open the front doo and delivery unit.

3) Turn the fixing assembly knob slightly counterclockwise; keep it for 15 seconds, and turn the knob further to remove the copy paper from the fixing assembly.

4) Measure the width over which the toner is shiny; see Figure 4-97.

Figure 4-98

COPYAIGNT G 1992 CANON INC.

CANON NPZ120/2MO REY.2 OEC. IN92 PAINTEB IN JAPAN [IMPRIME AU JAPNNI

4-31

- MECHANICALSYSTEM

9. Mounting the Thermal Switch

Check that the detection face of the thermal switch is evenly in contact with the surface of the upper fixing roller.

Make sure that the hook of the thermal switch holder is securely engaged with the fixing assembly upper plate.

Thermal switch holder Fixing assembly

10. Positìon of the Paper Guide

The paperguide is positioned by the paper guide mount. Assuch,thepositionofthepaperguideneed not be adjusted.

Note:

The position of the paper guide needs to be adjusted if the paper guide mount has been removed; therefore, do not loosen the screw on the paper guide. If necessary, mark the position on the fixing assembly mount using a scriber before loosening the screw.

Note:

To adjust the position of the paper guide, place the fixing assembly on a desk, and move the paper guide mount so that it is positioned as shown in Figure 4-I 01.

Figure 4-99

Note:

The thermal switch need not be adjusted; if the contact is not even, check if the thermal switch spring is deformed.

Do not use mounting screws otherthan those specified.

Figure 4-l 01

4 - 3 2

Leaf spring

F

-

Thermal switch

Conducting screw wi

Thermal switch i

/.t

upper roller

)

Figure 4-l OO

COPYRIGHT G 1992 CANON INC.

C A N O N NP2120/2MO REY.0 MA” 1990 PAINTED IN JAPAN IIMPRIME AU JAPONI

11. Removing the Upper Separation

Claw

1) Open the delivety unit.

2 Mark the position of the upper separation claw retainer using a scriber.

3) Removethe three mountingscrews, and remove the upper separation claw retainer; be careful with the delivety detection lever at the time.

12. Mountingthe Upper Separation Claw

Reverse the steps above to mount the upper separation claw with the following in mind:

- Keep the upper separation claw unit to the rear; if a scar is made on the upper fixing roller, mount the claw about 4 mm displaced to the front.

13. Removing the Lower Separation

Claw

1) Open the delivery unit.

2) Slidethelowerseparationguideplatetoremove.

@ Mounting screws

@ Upper separation claw retainer

@ Delivery detection lever

Figure 4-102

4) Remove the spring, and remove the upper separation claw.

@ Lower separation guide plate

Figure 4-103

3) Remove the spring, and remove the lower separation claw.

COPYRIGHT Q 1592 CANON INC.

CANON NP2¡20/2MO RN.0 MAY 1990 PRINTEU IN JAPAN IIMPAIME AU JAPONI

4 - 3 3

:.

CHAPTER 5

INSTALLATION

Thecopieriscarefullyacljustedandstrictlyinspected beforeitleavesthefactoryand, therefore, proper installation is very important in maintaining its out-of-factory performance. Make sure that all the conditions discussed in this chapter are satisfied before installation, and carry out all necessary inspections after installation.

1.

LOCATION ...........................................

COPVRIGHT 0 1992 CANON ING.

5-l

II.

UNPACKING AND INSTALLING

THE COPIER ........................................

5-2 lll.

SETTING THE CASSETTE

SIZE ......... 5-8

IV.

SETTING THE CT UNIT ....................... 5-13

V.

RELOCATING THE COPIER ................ 5-14

VI.

SETTING CONTROL CARD V .............. 5-15

VII. ATTACHING THE DOCUMENT

HOLDER ...............................................

5-l 7

CA,,ON HP2120/2020 AEVSJ M A V 1990 PRINTED I N JAPAN IIMPAIME AU JAPONI

The location of the copier should be chosen based on the following considerations. If posible, make a visit to the userfor a study of the site before delivery of the copier.

A. The ambient temperature should be between

7.5”C to 35°C (45.5”F to 85°F) and the humidity,

1 O%to80%. Avoid locationsnearwaterfaucets, humidifiers, water boilers, and refrigerators.

B. Avoid locations near open fire or subject to dust or ammonia fumes and direct rays of the sun.

Provide curtains over the Windows if necessary.

C. Choose a well-ventilated place.

D. Make sure all feet of the copier will be in contact with the floor.

E. Allow at least 10 cm (3.9 in) from any wall to provide access.

INSTALLATION BZ%

Jr

(59.0 in) i2 m (78.7 in.) min. -

(2.1 mJ32 7 in. min II NP2120)

Figure 5-1

10 cm min. (3.9 in)

1 2 . 5 m (98.4 in.) min. -

(2 6 m/102.4 in. min if NP2120)

Figure 5-2 (with sorter)

1

1

COPVAIGHT 0 1!332 CANON INC.

C A N O N NPZl20/2020 REY.1 OEC. 1992 PAINTEO IN JAPAN lIMPRIME AU JAPON) 5 - l

When a piece of metal is movedfrom acold place to a warm place, droplets of waterform on its surface. This phenomenon is known as condensation and affects the performance of machines. The simplest way lo eliminate condensation in the copier, any machines for that matter, is to leave it alone until it warms to room temperature

(at least one hour).

14. Unpacking

jter work

2

Open the shipping carion.

Remove the plastic cover, and pull out the five grips from the copier.

With three persons, hold the grips and place the copier on the pedestal.

If a pedestal is used, make sure it has been installed correctly according to its installation manual.

If you are placing the machine on a cassette pedestal, make sure that the pedestal has been installed properly accordingto the INSTALLATION PROCEOUAE that comes with it.

Grips

Grips

3

4

Open the cardboard box, and take out the parts and accessories.

Check that the folloying are available: m Copy tray

’ OPERATOR’S MANUAL m Drum unit

B Black toner

Remove all tape, and take out the cassettes: remove the cushion blocks from lnside the cassettes.

5 - 2 COPVRIGNT 8 1992 CANON INC.

CANON N?Zl20/2MO RN.1 OEC. 1992 PRINTEO IN JAPAN IIMPNIML AU JAPONI

Xep

5 wolk

Remove the tape that secures the optical unil in place (outside the leff cover), and slide the fixing to the right and pull it out.

Remarks

INSTALLATION

Tape Fixing for optical unit

6

7

Open the front cover, and disengage the developing assembly, and remove it from the copier.

Remove the cushion blocks from the feeder unit and fixing assembly.

Check that the developing cylinder is free of scratches.

Cushion blocks

COPVRIGHT 8 1992 CANON ING.

C A N O N N?Zl20/2070 REY.1 DEC. 1992 PNINlEO IN JAPAN IIMPRIME AU JAPON)

5 - 3

#tep

8 wolk

Disengage the feeder unit, remove the knob, and remove the dummy drum.

Keep the knob for use later.

Remarks

9 Remove the lens lock screw (wl shipping tag) from between the drum unit rails of the copier.

10 Open the delivery cover, and remove the two fixing roller release rolls.

The reafter, close the delivery cover.

5 - 4 COPVRIGNT 0 1992 CANON INC.

CANON N?Zl29/2MO RN.2 DEC. 1992 PRINTED IN JAPAN IIMPAIME AU JAPONI

INSTALLATION W53

B. Mounting the Drum

The photosensitive drum is susceptable to light; if exposed to mom light, it can cause white spots or black lines on the copy images. As such, be quick in performing the following work.

itep

1 work

Take out the drum cartridge from the box, and remove the light-blocking sheet.

Drum unit

Remarks

2

3

4

Take care not to damage the drum.

Set the drum unit in the copier, and fix it in Slide the drum unit straight along the rails into the copier.

place using the knob that held the dummy drum.

Move the grip to clean the corona wire of the drum unit two to three times.

Set the developing assembly in the copier, The front cover may be left open.

and engage t.

COPVAIGHT 8 1992 CANON ING.

CANON N?2l20/2~0 REY.0 OEC. 1992 PAINTEO IN JAPAN IIMPRIME AU JAPONI

5--4a

C. Checking the Operation

INSTALLATIONm

Check that the ADD PAPER and CASSETTE OUT cond copy operation is over.

COPYRIGHT F3 1592 CAHOH INC.

C A N O N NP212012MO REY.1 OEC. 1992 PAINTEO IN JAPAN IIMPAIME AU JAPONI 5 - 5

D. Aciding Toner

Remove the toner cartridge, and keep it in

Glose the developing assembly lid, and

Turn the developing assembly lever on the wpyboard aft key goes green, and make six to ten

5 - 6 COPYAIGHT 0 1992 CANON INC.

CANON NPZlZO/ZMO RN.0 MAY IPJO PRINTEO IN JAPAN IIMPRIME AU JAPONI

INSTALLATION BBZ3

E. Checking the Image

itep

1 work

Place the Test Sheet on the copyboard, and check the image.

2 Feed paper in the manual mode.

Remarks

Check that copies are made without a problem and the non-image width along the leading edge is correct; othelwise, make adjustments.

Non-image width:

2.0 mm/0.08 ir! (approx.) for

leading

edge

2.5 mm/O.l in (approx.) on left/right side

Make tow-sided and overlay copies, and check that the operation is correct; otherwise, make adjustments.

Check pick-up by the multifeeder (NP2120).

3

4

Put the OPERATOR’S MANUAL in the pocket of the copyboard cover.

Clean up the area around the copier, and fil1 out the Service Sheet.

When all above work is finished, install the options (ADF-Al, MS-Al, Sorter-Al, Stapler Sorter-Bl , Stapler

Sorter-BP, andlor Control Card) and the document holder.

W Points 10 Note for Photosensitive Drum Aiter

Installation

The photosensitive drum is susceptible to light and, if exposed to light, can cause white spots or black lines on the copy image; take note of the following:

- Limit the replacement of the CT unit within one minute;

- Limit the removal of jams within five minutes; and

- Keep the drum wrapped in the light-blocking sheet (from drum unit) or fresh copy paper and place it in a dafk place whenever it is removed from the copier.

Donottouchthedrum;if itssurfaceissoiled,wipe off the dirt using a flannel cloth coated with toner. Do not use paper, lint-free or otherwise, or use a dry cloth or solvent.

COPYRIGNT G 1992 CANON INC.

CAHON NPZl20/2MO RN.2 OEC. 1992 PRINTEO IH JAPAN IIMPRIME AU JAPONI

5 - 7

The copier’s cassette may be modified to suit the desired paper size by modifying the rear stop plate, spring, and face plate.

@ Modifying the Cassette Size

1) Turn over the cassette, and remove the screw that holds the rear stop plate in place.

Bottom of cassette

Figure 5-3

2) Change the rear stop plate to suit the desired paper size; note the index on the bottom, and see Table 5-l.

Note:

For the following, use two rear stop plates; note the index on the bottom of the cassette:

84, A4-R, LGL, ARG-R, 11X17, LTR-R.FLS,

G.R, FOLIO, G.LGL, AUS. FLS, BLV.,

ARG.LGL, E., OFC

COPY PaPer SiE

A3

11x17

A4

Letter

Government Letter

K0rean

84

Legal

B5

Argentine Letter

A4-R

Lí?ttWR

B5R

Argentine Legal

Government Letter-R

Government Legal

297mm5420mm

(11.7’X16.5”)

297mmX432mm

(ll’X17”)

297mmX210mm

(1 1.7”X8.3’)

279mmX216mm

(11 .WX8.5-)

267mmX203mm

(11.7’583”)

265mmX190mm

(10.4”X7.5’)

257mmX364mm

(iO.i’Xl4.3”)

216mmX356mm

(8.5”x14.0”)

257mmX182mm

(lO.l”X7.2’)

28OmmX22Omm

(ll .O”X8.7”)

210mmX297mm

(8.3”Xll.7’)

216mmX279mm

(8 YXi 1 .O’)

182mmX257mm

(7.2”XlO.l”)

220mmX340mm

(8.7-X13.4”)

203mmX267mm

(8.0-X10.5’)

203mmX330mm

Argentine Letter-R

Foolscap

Folio

1 G. LGL

G.

K.

84

Rear stop plate

A3 itx17

A4

LTR

LGL

85

Arg.

A4

q

LTR

q

85

q

Arg.LGL

(8.1”Xí3.3”)

190mmX265mm

(7.5-X10.4’)

216mmX317mm

(8.5-X12.5’)

22OmmX320mm

/8.o’X10.5’1

216mmX355mm

(8.5”X14.0’)

Table 5-1

K.

q

OFC

E.

BLV

5 - 8

cOPYAIONT Q 1592 CANON ING.

C A N O N NP2,2O/ZMO REY.0 MAY 1930 PRINTEO IN JAPAN IIMPRIME AU JAPONI

6)

Slide the paper size plate along the index on the bottom of the cassette to suit the desired paper size.

Figure 5-4

3) Fixthestopplate inplaceusingscrews(M4XlO).

Note:

See “Replacing the Cassette Spring” when using a different type of spring.

4) Remove the side stop plate each from the two cassettes.

Side sfop plate

Figure 5-7

7)

8)

Place about 100 sheets of paper (fresh out of package, of thedesired size) in thecassette, and butt them against the front of the cassette.

Keep the side stop plate between the bunch of sheets and size plate as shown, and screw the size plate using a screw; make sure that thesize plate is butted against the side stop plate.

,

Sh

Figure 5-5

5) Remove the two screws that hold the paper size plate in place.

Figure 5-8

9) Fix the side stop plate in its original location.

COPYRIGHT Q 1092 CAWON NC.

Figure 5-6

CAIIOR HPZl2WWl R N . 0 MAY 1590 PAINTEU I N JAPAN IIMPAIME AU JAPOW]

5 - 9

10) Set the cassette size roll; see Table 5-2.

COPY paper

85 u2

A4

85

q

84

A4 q

1 2 3 n n n n w n n

4 n

Ul

I u2

I Letter

1 STMT

1 Legal

Letter q ll”X17” u2

Ul w

IDI I

n

III IBI

I=I Imlm

/wlmI I l=lml I= n n n n n n n

Argentine Legal, Foolscap,

Government Legal, Folio

Australian Foolscap, Officio,

Ecuadorean Officio,

Bolivian Officio

Government Letter,

Argentine Letter, Korean Ledger

Table 5-2

Il) Detach and attach the face plate; see Table 5-3.

A3

11x17

A4

Letter

Argentine Letter

Government Letter

K0rean

84

EE

A4-R

LlXtWR

Argentine Legal

Government Lener-R

Government Legal

Argentine Lener-R

Foolscap

FOliO a b a b a b a b abcd abcd abcd abcd abcd abc abc abc abc a b a b a b a b

I Leoal

Korean Ledger-R

Em iab a a

Table 5-3

Claw C a s s e t t e Inside plate

5-10

Figure 5-7

12) Attach the size label on the cassette; if the label is not available. use a blank label.

COPYRICNT 0 1992 CANON INC.

CANOH NPZl20/2MO RN.1 JAN. 1992 PRINTED IN JAPAN [IMPRIME AU JAPONI d

@ Replacing the Cassette Spring

- The copier can be reset for a different size of copies by modifying the cassette spring as shown in Table 5- 4.

Remove the inside plate and spring

84185

Table 5-4

ARGENTINE LTR

GOVERNMENT LTR

KOREAN

ARGENTINE LGL

GOVERNMENT LGL

ARGENTINE LTR-R

GOVERNMENT LTR-R

FOOLSCAP FOLIO

AUSTRALIAN FOOLSCAP

KOREAN-R

ECUADORAN OFICIO

BOLIVIAN OFICIO red

Remove the two rubber stoppers from the inside plate.

Figure 5-I 1

Change the spring as shown in Table 5-4.

Set the inside plate, and attach the rubber stoppers.

Figure 5-10

Figure 5-12

Check that the rubber stoppers are correctly attached; further, check that the spring at the rear is correctly set on the fixing behind the inside plate.

Inside plate spring fixing

/

COPYAIGNT 0 1992 CANON INC.

Figure 5-13

C A N O N NPZl2012MO RN.0 MAY 1990 PRINTEO IN JAPAN IIMPAIME AU JAPOH)

5-11

5ZZ4 INSTALLATION

@ Removing the Pick-Up Roller

If the cassette is sized to GOVERNMENT LTR,

KOREAN, or KOREAN-R, remove the pick-up rollers shown below (metric rollers).

* GOVERNMENT LTR and KOREAN

* KOREAN-R

Figure 5-15

5 - 1 2 COPYAIGNT Q 1992 CANON ING.

CANON NPZl20/2MO REY.0 MAY ,990 PRINTEO IN JAPAH IIMPRIME AU JAPON)

IV. SEBTING I-HE CT UNn

1) Hold both ends so that the yellow seal (round) is tothefront,andturnitinthedirectionofthearrow about ten times as shown below.

3) Put the CT unit back into Ihe sloraae case and

I shake it about ten times in Ihe dlreclion of thc arrow.

Figure 5-16

Shake it in the direction of the arrows about ten times.

Figure 5-16

2) Take the CT unit from the storage case, and set it in the copier; thereafter, hold the CT unit in place, and pull the yellow tab straight out.

Note:

Do not pull out the orange

film.

Figure 5-19

5)

6)

Set the CT unit in the copier once again, and make test copies in the DIRECT mode; repeat step 4) if the image is uneven.

Set the CT unit in thecopier, and pull the orange tab straight out; thereafter, close the front door.

Figure 5-17

) Tab(orange) 1

Figure 5-20

COPYRIGNT = 1992 CANON INC.

CANON NPZlZO/ZMO RN.0 MAY 1990 PAINTEil IN JAPAN IIMPRIME AU JAPORI 5-l 3

Periorm the following when relocating the copier by truck or other means of transportation

1 Stw 1

I I work

Remove the drum unit.

Fix the scanner and lens in place.

corona units and feeder unit release lever in place against

I

Check

Put the drum unit in a box for transport.

I l

Remarks

4 Tape the front door and delivety unit.

5 Place a sheet of A3 or 11 “X1 7” paper on the copyboard glass, and tape the copyboard cover.

5-14 COPYRIGHT Cj 1992 CANON INC.

CANON NPZ,20,2MO WV.0 MAY 1990 PAINTEO IN JAPAN IIMPRIME AU JAPONI

INSTALLATIONW

Open the front door, and remove the inside cover.

Remove the control panel; see p. 4-4.

Turn over the control panel, remove the screw that holds the face lid in place.

Remove the face plate.

7 1

@ Holes for mounting screws

Figure 5-23

Check that the connector for the printer is found at the center of the hole.

\-

@

@ Face plate 0

0

Mounting screw

Face lid

Figure 5-21

5)

6)

Remove the protection sheet from the indicator unit of Control Card V.

Placetheclearsheetoverthe holeoftheindicator unit.

0

@I Connector for printer

Figure 5-24

/-

0

0

Hole

Figure 5-22

7)

Fix Control Card V on the control panel using four mounting screws.

Slide a card into Control Card V, and fix Control

Card V where the card can be slid in and out

COPYAIGHT G 1992 CANON ING.

CANON NP21'20/2020 REY.0 MAY 1990 PRINTED IN JAPAN IIMPRIME AU JAPONI

5-15

6) Attach the grounding wire for Control Card V.

Note:

Keep the grounding wire as far as possible from the DC harness.

10) Connect the 4P connectorof Control Card V and the 4-P connector of the control panel on the copier side.

@ Grounding wire Q DC harness

Figure 5-25

9) Disconnect the shorting connector of the control panel shown in Figure 5-26.

0 4P connector @ Shorting connector

Figure 5-26

11) Mount the control panel on the copier; then, arrange the grounding wire of Contra1 Card V using a harness band.

12) Remove the protection sheet from the control panel guide plate of Control Card V.

13) Attach the control panel guide plate of Control

Card Von the control panel of the copier.

5-16

COPYRIGNT 0 1992 CANON INC.

0 Guide plate

Figure 5-27

14) Turn the copier ON, and check the operation of

Control Card V.

15) Attach the inside right cover.

CANON NPZl20/2MD RN.1 JAN. 1592 PAINTED IN JAPAN IIMPAIME AU JAPONI

1.

NP2020

The document holder may be attached to the left 01 right of thecopier; thefollowing represents attachment of the holder on the left cover side.

1) Remove the two screws of the left cover.

2. NP2120

You may choose to attach the document tray on the side of the left cover.

1) Fit the mounting screws in the holes shown, and attach the document tray; see Figure 5-30.

Figure 5-30

@ Screws (not used)

Figure 5-28

2) Attach the document holder.

0 Document holder

Q Mounting screw (accessofy)

Figure 5-29

COPYAIGHT IiZ 1992 C A N O N I N C .

LANON NPZl20/2MO RN.I UEC. 1932 PRIWTEO I N JAPAN IIMPRIML A G JAPONI

5-17

i

CHAPTER 6

MAINTENANCE AND SERVICING

1.

PERIODICALLY REPLACED PARTS .. 6-i l l . CONSUMABLES .................................. 6-2

III.

PERIODICALSERVICING ................... 6-3

COPYRIGNT 0 1592 C A N O N I N C .

IV.

PERIODICALSERVICING CHART.. .... 6-4

C A N O N NPZl2012mO R N . 0 M A Y 1990 PAINTEU IN JAPAN IIMPRIME AU JAPONI

Some parts of the copier need to be replaced on a periodical basis; those listed below must be replaced regardless of damage or wear, since they can affect the very operation of the machine when they fail. Replace each part during the scheduled visit closest to the life indicated.

as of July 1992

7 Developing roll (rear; developing assembly)

FS2-6019-000 1 500,000

Note:

The above are estimates only and subject to change to reflect data from the field.

COPYAIGNT 0 1992 C A N O N I N C .

C A N O N NPZl20/2MO AN.I OEC. 1992 PRINTEO IN JAPAN [IMPRIME AU JAPUNI

6 - l

Some parts of the copier may need replacement overthewarranty period because of wearor damage; replace them when they have failed.

No.

1

9

2

3

4

-

5

6

7

8

Parts name

Oil application roller

(fixing assembly)

Scanning lamp (optical unit)

Parts No.

FA6-5369-000

Q’ty

1

Life

50,000

Pick-up roller (pick-up unit) assembly)

Pre-exposure lamp

Upper fixing roller (fixing assembly)

Separation claw (upper; fixing assemblvl

Separation claw (lower; fixing assemblvl

I I

Thermistor (fixing assembly)

Insulating bush (fixing assembly)

Fixing heater (fixing assembly)

Developing cylinder (developing

FH7-3113-000

FH7-3114-000

1 FA6-5547-000 1

FA5-1768-000

FGl -7416-000

FA6-5361-000

FA6-5433-000

1

1

1

1

12

2

100,000

100,000

100,000

100,000

200,000

200,000

/ 5 l 2oo~ooo I

FA2-9037-000

FH7-7127-000

FA5-2967-000

FH7-4289-000

FH7-4290-000

FH7-4291-000

FH7-4292-000

FA6-5297-000 l 5 l 2oosooo I

1 300,000

2

1

300,000

300,000

1

1

1

1 t

300,000

300.000

300,000

300,000 as of July, 1992

Remarks

100/115v

220/24OV ioov

115v

220v

240V

I

I

13

14

17

-

18

19

20

-

Upper feeder roller (NP2120)

Lower feeder roller (NP21 20)

/ FCI-7558-000 1

FG2-5299-000 1

1 300,000

300,000

Note:

The values above are estimates only and subject to change based on future data.

6 - 2

COPYAIGNT 8 1992 C A N O N I N C .

C A N O N NPZlZO/Z&?O AN. OEC. 1992 PAINTED I N J A P A N IIMPAIME AU JAPONI d

MAINTENANCE AND SERVICING tZZi?B

Note:

1.

As a rule, conduct the following wok every 20,000 copies.

2.

Check the service record before paying a vis%, and take replacement parts if necessary.

;tep

1

2

3

Work

Meet the operator.

Record the counter reading.

Make test copiers; in the DIRECT,

REDUCE, ENLARGE, page separation modes.

Checks

Check the condition.

Check the faulty copies.

Check the following: a. image for density b. background for dirl c. characters for clarity d. leading edge for margin e. left and right sides for margin

1. fixing, registration, and back of copy for dirt g. abnormal sound h. counter operation

4 Clean the corona units.

Remarks

Standards:

1.5 fo.5 mm/0.061t0.02 in

(DIRECT)

Standards:

2.5 el.5 mm/0.1+0.06 in

(DIRECT)

Dry wipe the units using lintfree paper; thereafter, clean them using an alcohol solution. Do not set unless dn

Clean the eliminator using the cleaning brush (accessory).

5

6

7

8

9

10

11

12

13

Clean the static eliminator and feeder unit.

Clean the fixing unit and delivery unit:

- paper guide plate

- separation claw (upper, lower)

0 static eliminator (brush)

Conduct periodical servicing according to the number of copies processed; see p. 6-4.

Clean the copyboard cover and copyboard glass.

Make test copies.

Make sample copies.

Put the sample copies in order, and clean up the area around the copier.

Record the counter reading.

Fil1 out the Service Sheet, and reporl to the operator.

Use a solvent.

Use a solvent.

COPYRIGHT 8 1992 C A N O N ING.

C A N O N NPZl20/2MO RN.1 JAN. 1592 PAINTEO IN JAPAN [IMPRIME AU JAPON) 6 - 3

Note:

Do not use solvents or oils other than those specified.

A: Clean 0: Replace X: Oil 0: Adjust 0: Check

Remarks

6 - 4

COPYAIGHT %j 1992 C A N O N ING.

C A N O N NPZl20/2MO KV.0 MAY ,930 PRINTEO IN JAPAN [IMPRIME AU JAPONI

APPENDIX

1 .

2.

3.

4.

5.

6.

7.

8.

GENERAL TIMING CHART.. ................

A-l

SIGNALS AND ABBREVIATIONS.. ......

A-3

GENERAL CIRCUIT DIAGRAM.. ..........

A-5

WIRING

DIAGRAM

...............................

A-6

DC CONTROLLER PCB ....................... A-l 1

MOTOR DRIVE PCB ............................ A-25

DC POWER SUPPLY PC0.. ................. A-26

DC POWER SUPPLY

FOR OPTIONS ..................................... A-27

COPYRI6HT 0 1992 C A N O N I N C .

9. ADJUSTING PC0 ................................. A-26

10. PRE-EXPOSURE LAMP ....................... A-29

11. AE SENSOR ......................................... A-30

12. HVT ....................................................... A-31

13.

LIST OF SPECIAL TOOLS ................... A-33

14.

LIST OF SOLVENT AND MATERIAL.. A-34

CAHON NP212012020 R N . 1 J A N . 1592 PAINTEO I N JAPAN IIMPRIME AU JAPONI

2. SIGNALS AND A

csz 0 csz 1 csz 2 csz 3

CTD

DCBC

DSLD 0

DSLD 1

DSLD 2

DSZ 0

DSZ 1

DSZ 2

FDCL 1

FDCL 2

FMPD

FM3D

GRDON

HTRD

HVTON

Signals

ACBON

ACOFF

AE

AEGIN

BTEP

CBCCI

CBCC2

CCNNT

CCNTD

CLCCW

CLCW

PEXP

PUSL 1

PUSL 2

RDC

RGCL

RGPD

SBHP

SBSL

SCHP

SPPD

LAPON

LCPD

LGHT

LHP

LON

LINT

MFPD

MMD

MCD

MSD

OILSL

PDP

AC BIAS ON command

AC POWER OFF command

AE SENSOR OUTPUT signa1 (Analog)

AE SENSOR GAIN signa1 (Analog)

BLACK TONER EMPTY signa1

COPYBOARD COVER CLOSED signa1 1

COPYBOARD COVER CLOSED signa1 2

CONTROL CARD CONNECT signa1

CONTROL COUNTER DRIVE command

CLEANING MOTOR COUNTERCLOCKWISE command

CLEANING MOTOR CLOCKWISE command

CASSEnE SIZE signa1 0

CASSETTE SIZE signa1 1

CASSETTE SIZE signa1 2

CASSETTE SIZE signa1 3

CT-UNIT DETECTION signa1

DC BIAS CONTROL signa1

DOCUMENT SIZE LED DRIVE command 0

DOCUMENT SIZE LED DRIVE command 1

DOCUMENT SIZE LED DRIVE command 2

DOCUMENT SIZE DETECTION signa1 0

DOCUMENT SIZE DETECTION signa1 1

DOCUMENT SIZE DETECTION signa1 2

FEED ROLLER CLUTCH DRIVE command 1

FEED ROLLER CLUTCH DRIVE command 2

FAN MOTOR 2 DRIVE command

FAN MOTOR 3 DRIVE command

GRID BTAS ON command

FIXING HEATER DRIVE command

HVT ON command

LAMP ON command

LOWER CASSETTE PAPER DETECTION signa1

LIGHT signa1

LENS HOME POSITION signa1

LED ON command

LIGHT INTERNSITY signa1 (Analog)

MANUAL FEED PAPER DETECTION signa1

MAIN MOTOR DRIVE command

MULTIFEEDER CLUTCH DRIVE command

MULTIFEEDER SOLENOID DRIVE command

CLEANING ROLLER SOLENOID DRIVE command

PAPER DETCTION signa1

PRE-CONDITIONING EXPOSURE LAMP command

PICK-UP SOLENOID 1 DRIVE command

PICK-UP SOLENOID 2 DRIVE command

RIGHT DOOR CLOSED signa1

REGISTRATION ROLLE CLUTCH DRIVE command

REGISTRATION ROLLE PAPER DETECTION signa1

SHUTTER BLANK HOME POSITION signa1

SHUTrER BLANK SOLENOID DRIVE command

SCANNER HOME POSITION signa1

SEPARATION PAPER DETECTION signa1

COPYAIGNT 62 1992 C A N O N I N C .

C A N O N NP212K’MO RN.I DEC. 1592 PRINTED I N J A P A N IIMPNIME AU JAPON)

A - 3

TCNTD

TH

UCPD

WCHP

WCRP

ZXDP

TOTAL COUNTER DRIVE command

FIXING ROLLER SURFACE TERMPERATURE signa1

UPPER CASSETTE PAPER DETECTION signa1

CORONA WIRE CLEANER HOME POSITION signa1

CORONA WIRE CLEANER REAR POSTION signa1

ZERO COCC DETECTION signa1

Abbreviations

AER

INTR

LSTR

SCFW

SCRV

STBY

WMUP

WMUPR

AE ROTATION

INITIAL ROTATION

LAST ROTATION

SCANNER FORWARD

SCANNER REVERSE

STANDBY

WARM UP

WARM UP ROTATION

A - 4

COPVRIGHT 0 1992 C A N O N ING.

C A N O N NP2WJ/ZMO HEY. O E C . 1992 PRINTED I N J A P A N IIMPAIME AU JAPONI

t switch

l- /

m x

AOPZ /AOZZ

m-

wapad

(uo!@)

22Er

wapad

(uqdo)

8lEP

1

V33 x3n ozsn dOad d3d)l

1ZSX ddll

533

EZS3d sai7 ad:

EaN

Od;

EOI\

Cd: b

3~ soI\ m

BAV

EAP

1130

3

3

:

*OWd

*1311

)iOd

X33d

BAV

PZON

SON

SON

*al30

3

*Utlfld

*13nd

Jwaaj

Japaaj Jallol

JallOJ 431Ill3

7, q3lnl3

1 l$&

1 ajlassy)

2 a]lasse3

fenuefl

JOOP

paai

Jaded

Wl!MS

mded

Jaded

JOSU~S

Josuas

JOSUas

011\13

EAV oxu-

5OR

5ON

0x1.

Ado lelo1 ~alunoc~

p

y3leg IaAal Jauoj

Jaded uo!geqs!!k-a+j Josuas

uwalap mm-13

Josuas

al!M

aJ!w

uq pxleqx=J duy aJnsodxa-a&-j

yUG’la

1~

Y31!MS p!OLHlOS

p!oualos uo!wydde

w;;: r------

JCNJW~3

~aueap

JEtN

auJoy

uo!ge~edag

~uawn3oa az!s

SU31

JWlJL’3S eA!Jp

~osuas Jaded

uo!gsod

uo!l!sod

43J!MS

I+~!MS

JOlOLll

JOlOW

uq 1apaaj

1 UO!le3!gluap!

SON6 dU3h

SON8

GIlN dH3M

EAVZ

OZWj

AC

OddS

3

&

R N

&g

VN,

783Nl dn33S

3-35

O-35

3-35

E-35

V-OS

18335

waumoa az!s

0 uo!~myy~ap!

ozsa

OOxiQ

AF dH1

SON3

AZ1

VAVZ

5ON3

3v

SON6

VAV2

NIV33V

Al

Er

80Er

SCEr

~

az!s luaum3oa

WIRING DIAGRAM (NP2020lA603)

Motor driver PCB

112 3 415 J402

J201

+g

IL,““”

DC power supply PC6

DFiSorter

DCpowersupply

PCS J206

COPYAIGHT D 1992 CANON ING.

CANON NPZl20/2CQO AEV.0 MAY 1990 PRINTEU IN JAPAN IIMPRIME AU JAPONI

A - 9

:-9zcr

-9zcr a m

0 t n

I w LL

r

I I i

am

::

I

I h

I

l I

I

B m 0

4 u

I m ll

SSEr

1ZEî

6LEr

81Er

A H

-

E

‘“IU

A5

3ati

SaNO

Oddlnl

5aND

AS ad31 saN3

AS adan

SaNE)

SaN3

SaND

* alaa3

*wdnda

*landa nada

X33dO

*13la

*anda w3a x3na ozsna tzsna dOad0 ddlla d3dYa

EZS3dO

503a m laN3 j

-,.

033 n3v

AS dH1

SaN3

SaND

AZ1

VAPZ

WNF)

VAPZ

3v oam ozsa

NIW3V dH3M

EAPZ

PONE) azwd dtl3M

SaNE)

SCINO addS

AB

90sr

IN11 bU,\I?.i

daxz lHD1

ZklOc)V

VAPZ

1-i amz

; m z z

E09r

9zr L i z-PPî w

9 Eo9r z-9zr

9-Eo9r

P -

E-Eo9r

_--, _ pJplE

SoEr

.g

’ IAH

4

1

1

9061’

A P P E N D I X W

WIRING DIAGRAM (NP2120/A603)

Motor driver WI3

DC power supply PCB

24VA

NC

GNDS

24VB

GND24

GND12

12v

GND5

5v

MMD

1 J202

DCconfroller Pee

I

COPYAIGHT 0 1992 CANON ING.

CANON NPZl20L'MO RN.0 OEC. 1932 PRINTEO I N J A R N (IMPAIME AU JAPON]

A-9d

m APPENDIX

WIRING DIAGRAM (NP2020/A604)

3 I b2 I

Wirfng for DF andSoner(DC controllerPCB¡s FG2-2829orFG2.2830)

1

J39 mmmm

J817 x 7 7

1 2 3 4 5 6 7 8 9 1 0 1 1 1 2

To DF

A-10

COPYAIGHT 0 1992 CANON ING.

CANON NPZl20/2CQO AN.f JAN. 1932 PAINTED IN JAPAN IIMPAIME AU JAPON,

A P P E N D I X bZS3

13. LIST OF SPECIAL TOOLS

Special tools which are required for servicing this copying machine (in addition to the standard tool set) are listed below.

No.

1

Tool name

Door switch actuator

Tool No.

TKN-0093

Shape Code

A

ApplicatioriRemarks

2 Spring scale

(compression)

CK-0054 B - Measuring cassette spring strength

- Adjusting scanner drive cable tension

3 Cleaning oil TKN-0464

Note: Rank

A: Each serviceman should carry one with him.

B: A group of five servicemen should share one.

C: Each workshop should keep one.

COPYRIGNT c 1992 CANON INC.

CANON NPZlZWZMO AEV.0 MAY 1990 PAINTEO IN JAPAH IIMPRIME AU JAPONI

A - 3 3

APPENDIX

14. LIST OF SOLVENT AND MATERIAL

NO.

Name

1

2

Ethyl alcohol

(Ethanol)

Isopropyl alcohol

(Isopropanol)

MEK

Use

Cleaning copyboard glass, mirror. etc.

Removing toner or oil stains

Chemicalformula, mixture ratio. etc.

CzH50H

(CH+ CHOH

CHYCO.CZH~

Methyletyl ketone

3 Heat-resistant grease

4 Lubricating oil

(lowviscosity)

5 Lubricating oil

(lowviscosity)

Lubricating the drive mechanisms; e.g., copyboard driving gear, fixing drive gear, fixing ass’y, etc.

Lubrication points:

Scanner rail, etc.

Lubrication point:

One-way clutch in pick-upcontrol unit

SO”~Cí3

Locally

Rema&

Flammable.

Use in a well-ventilated area.

Avoid breathing concentrated vapor.

Locally Flammable.

Use in a well-ventilated area.

Avoid breathing concentrated vapor.

Avoid contact with eyes orskin.

Do not use for cleaning the durm molded plastic parts, or corona vires.

CANON Tool No.: CK-0427 (500glcan)

(Equivalent grease can be used, but should be able to withstand

200% forextended periods of time.)

Locally Tool No.: CK-0451 (100~~)

Equivalent oil can be used:

ISO VG 66 oil

ESSO Febis K68

MOBIL Vactraoil No. 2

SHELL Tonna Oil T68

Locally Tool No.: CK-0524 (100~~)

Equivalent oil can be used:

ISO VG 220 oil

ESSO Febis K220

MOBIL Vactraoil No. 4

A - 3 4

COPYAIGNT Cc 1992 C A N O N I N C .

C A N O N NPZl2Ul2020 REY.0 MAY 1990 PRINTED IN JAPAH IIMPRIME AU JAPONI

STAL

SERVICE .’

MANUAL.

COPYAIGHT 0 1592 CANON INC.

CANON NP2l20/2020 KV.0 MAY 1990 PAINTEO IN JAPAN [IMPRIME AU JAPON)

br. . ..- “z.ï *~~l,~.d:.~il”~&.~ I-i ‘.T>iL. ,.7m.~zw‘+.. :.,“ii’, , .;G.!,::-: t-..r:... ,_. F.Tmi’,:,<, ,; Cr&, . . _ ..,

I.

SPECIFICATION _._.__.___<._.._____............... 1-l P

_, .,/ ;,. .., . ._

II. CROSS-SECTIONALVIEW .___..<..___.__.__ i-2P

1.

BASIC CONSTRUCTIONS .._._..<............ 2-l P

A. O u t l i n e o f E l e c t r i c a l Circuitry 2-l P

B.

Inputs to and Outputs from

Paper Deck Controller __._.._...._......... 2-2P

C. O u t l i n e ..__._.___._......................... 2-4P

D. Pick-up and Feed Operations ____._.___ 2-5P

E.

Releasing the Pick-Up and

Separation Rollers ._._.._.____.._..__........ 2-7P

1.

PICK-UP AND FEEDER SYSTEMS .._... 3-l P

A.

Pick-Up Roller _...__....___._..._............... 3-l P

B. Feed Roller _..,,..__.___.__..__.................. 3-2P

C. Separation Roller ._._.__.___.__............... 3-2P

D. Registration Roller ._._.._._.__.__..._........ 3-3P

II. DRIVE SYSTEM ._._,_<__._._.._..._................ 3-4P

A. Deck Drive Unit _....,._..__._.._._............. 3-4P

III. ADJUSTING THE REGISTRATION

(FRONT, REAR) .__._.___._._...._.................. 3-5P

A. Making Adjustments _.._._.__.__..__........ 3-5P

IV. MODIFYING THE DECK SIZE __............ 3-7P

1.

PARTS TO BE REPLACED

PERIODICALLY .__.._.______.._..._................. 4-l P

II. CONSUMABLES __.____._._.___.._<................ 4-l P

III. PERIODICAL SERVICING CHART ._..__. 4-l P

1. ARRANGEMENTAND FUNCTIONS

OF ELECTRICAL PARTS .______..___.__....... A-l P

II.

VARIABLE RESISTOR (VR), LED,

AND CHECK PIN BY PCB ._.................. A-3P

III.

DC CONTROLLER . . . . . . . . . . .._................... A-5P

COPYAIGNT ,G 1992 C A N O N I N C .

C A N O N NP2120/2020 REY.0 M A Y 1930 PRINTEO IN JAPAN [ I M P R I M E AU JAPONI

CHAPTER 1

GENERAL DESCRIPTION

1.

SPECIFICATION . . .._.______.................... l-1P

COPYRIGNI 0 1992 C A N O N ING.

I I . CROSS-SECTIONALV~EW ._......________. 1-2P

C A N O N NW,ZO/ZMO KV.0 MAY 1990 PRINW I N J A P A N IIMPRIME AU JAPON)

Item

Pick-up

Paper storage

COPY paper type

Copy paper size

Capacity

Size switching

Power supply

Dimensions

Weight

Specifications

Clawless

Front loading

Plain paper (64 to 80 g/n+)

A4, LTR

115 mm (stacked; approx. 1,000 sheets of 80 s/m2)

Plate and Size switch

,115VAC; from copier

610 (W) x 577 (D) x 429 (H) mm (24.0 (W) x 22.7 (D) x 16.9 (H) in)

28 kg161.7 Ib

COPIAIGNI 0 1992 CANON INC C A N O N NP2120/ZET BEY.0 MAY 1930 PAINTED I N JAPAN IIMPAIME AU JAPONI d l - l P

5!m G E N E R A L D E S C R I P T I O N

I

0 Lifter position sensor

Q Feeder roller

@ Deck pre-registration paper sensor

@I Deck registration roller

Figure l-201

@ Separation roller

@ Pick-up roller

@ Lifter l - 2 P COPYRIGNT 0 1992 C A N O N ING.

C A N O N NPZl2012MO KV.0 M A Y 1 9 9 0 PAINTED I N JAPAN IIMPRIME AU JAPONI

-

CHAPTER 2

OPERATIONS AND TIli/lING

In outline diagrams,-+represents mechanical drive paths, and = indicates electrical signa1 paths.

Signals in digital circuits are identified as ‘1’ for High and ‘0’ for Low. The voltage of signals, however, depends on the circuít.

Nearly all operations of the copíer are controlled by microprocessors; the interna1 workings of these processors are not relevant to the serviceman’s work and, therefore, left out of the discussions. By the same token, no repairs are prescribed for the PCBs at the user’s premises; for this reason, PCBs are discussed by means of block diagrams rather than circuit diagrams.

For the purpose of explanation, discussions are divided into the following: from sensors to DC controllerPCBinputports;from DCcontrolleroutputportstoloads;andminorcontrolcírcuitsand functions.

1.

BASIC CONSTRUCTIONS . . . . . .._._ 2-1 P

UIPYAICHT 0 1992 CANON ING.

CANON ~~2120/2ti70 nw.0 MAY ~30 PnwEu

I N

JAPAN IMPRIME Au JAPONI

1. BASIC CONSTWUCT~ON

A. Outline of Electrical Circuitry

advance to the controller inside the pedestal.

U p p e r limit switch 1 MS’ k

The paper deck pedestal is controlled by signals from its host copier and from its own controller.

The copier sends signals as programmed in

Figure 2-201 a

-@ Liflerclutch

Pi&up clutch relationship among the pedestal3 majar circuits.

The pedestal is supplied with 24 V, 5 V, and 115V

VAC by the host copier.

Paper d e c k c o n t r o l l e r P C B

AC

Figure Z-201 is a block diagram showing the tal3 controller generates signals to drive iti motor and clutches.

In response to the signals from the copier and from its own microswitches and sensors, the pedes-

2 - l P

COPYAIGNT 8 1932 C A N O N I N C .

CANON NPZl20/2MO REY.0 MAY 1990 PRINTEO IN JAPAN IIMPRIME AU JAPONI d

O P E R A T I O N S

A N D

TIMING

B. lnputs to and Outputs from Paper Deck Controller (1/2)

-7

- 8

- 9

53

- 1 papar dech contrclller PCB r----i w-

I

57

<HoSf mpk?r>

J80 J 3 2 2 DCcontro,,erPCB

SIZO

SI21

DKEX

Oscil!ation signa,

57

6 -: P D P 1 Wh.sn paper is presenf in deck. ‘1’.

P D P 2 When C?ZZ detecb papr, ‘1‘.

777

L T D Whsn Q23 dstects ,iffet,

‘1’.

J C D When ‘0’. CL1 toes ON.

4 -: Li

-

‘ C D Vhen ‘0’. CL2 goes ON.

15 -e

1

’ S D When ‘V. SLI goes ON.

6/ -7

-

I CD When ‘0’. CL3 goes ON.

2-2P

F i g u r e 2 - 2 0 2

COPYRIGNI 0 1592 C A N O N I N C .

CANON NPZf20/ZU20 RN.0 MAY 1590 PAINTED IN JAPAN [IMPRIME AU JAPON]

switch

OPERATIONS ANDTIMING

B. Inputs to and Outputs from Paper Deck Controller (2/2)

I

Jl

- 1 r

I

Paper deck controller PCS

-

~

F i g u r e 2 - 2 0 3

DC controller PCS l-

DMD When’O’. Mi goes ON.

L

DOP When right door is closed and deck is set,

‘1’.

COPYRIGNT 0 1992 CANON ING.

CANON NP2,20,2@0 mV.0 MAY 1990 PRINTEO IN JAPAN IIMPAIME AU JAPONI 2-3P

C. Outline

The paper deck motor (MI) serves to raise the lifterand drivethe pick-up, separation , and registration rollers.

The paperdeck motor is controlled by the signals from the copying machine as well as from sensors and switches by way of the paper deck controller

PCB.

The lifterlowers on itsown weightwhen thepaper deck is pulled out, releasing the gears.

-l-

Paperdecl<cannollerPC8 r----------v

2-4P

"

MS2 ci-

F i g u r e 2 - 2 0 4

COPYRIGNT 0 1992 CANON INC.

CANON NPZl20/ZMO KV.0 MAY 1990 PAINTEO IN JAPAN [IMPRIME AU JAPONI

D. Pick-up and Feed Operations

The paper deck picks up and feeds the paper in response to the signats from the copying machine.

The paperdeck motor (Msdriven in response to the deck motor drive (DMD) signa1 from the

Sopying machine

O P E R A T I O N S ANDTLMING m copying machine; drive is then transmitted to the pick-up and registration rollers by way of clutches.

The clutches in turn are under control of the signals from the copying machine.

When paper is picked-up, the pick-up roller is raised by the pick-up roller release solenoid (SLI).

-‘: cantrolfer PCB

,vertica, paf? roffer 1

,Vertical pa* rotler 2

Paper deck

Figure 2-205

COPYRIGNT 0 1592 CANON ING.

CANON NP2,20/2020 AN., JAN. 1992 PRINYEO IN JAPAN (IMPAIME AU JAPONI 2-5P

OPERATIONSANDTIMING

(1) Sequence of Pick-up and Feed Operations

COPY S T A R T key ON

Figure 2-206

24P COPYAIGHT 0 1932 CANON ING.

CANON NPZl20/2MO RN.0 MAY 1990 PAINTED IN JAPAN IIMPAIME AU JAPON)

E. Releasing the Pick-Up and

Separation Rollers

The paperdeck isof a front loading type; as such, the deck is pulled out for a supply of paper.

When the deck is pulled out, the pick-up and separation rollers are released; this design facilitates positioning of the deck and clearing of jams

O P E R A T I O N S A N D T I M I N G a

1. Releasing the Pick-Up Roller

The pick-up roller is released as soon as the grip of the deck is pulled.

When the latch on the grip comes off the cam on the edge of the roller release shaft, the arm on the rollerreleaseshaftrisesandthepick-uproller, inturn, is raised.

On the other hand, when the latch on the grip pushes up the cam upon insertion of the deck. the arm lowers and, in turn, the pick-up roller is lowered.

The arm is also used to release the pick-up roller during pick-up operation.

Figure 2-207

COPYAICHT 0 1992 CANON INC.

CANON NPZl20/2020 REY.0 MAY 1990 PAINTEO IN JAPAN [IMPRIME AU JAPONI 2-7P

2. Releasing the Separation Roller

Theseparation rolleris releasedwhen thecamon the deck side plate comes off the release lever roller.

Releare Iwer lease leve, ler

,c r-_<

Figure z-208

2-8P

Figure 2-209

CDPYRIGHT @ 1992 CANOA INC.

CANON NPZl20/2GZO EV.0 MAY 1990 PRINTEO IN JAPAN IIMPAIME AU JAPONI

CHAPTER 3

MECHANICAL SYSTEM

1.

PICK -UP AND FEEDER SYSTEMS ____ 3-1 P

II.

DRIVE SYSTEM . . . . . . .._____...................... 3-4P

COPYRIGNI 0 1992 CANON INC.,

III.

ADJUSTING THE REGISTRATION

(FRONT, REAR) . . . . . . . ..____......................

3-5P

IV.

M O D I N I N G T H E DEC SIZE . . . . 3-7P

CANON NPZlZO/ZMO RN.0 MAY 1990 PRINTEA IN JAPAN IIMPRIME AU JAPON)

Li. Pick-Up Roller

1) Remove the rear cover from the pedestal.

M E C H A N I C A L S Y S T E M KZZ?

3) Detach the deck from the front.

- Slide it out to the front until it stops; detach it as if to lift it.

@ Mounting screw

@ Rear cover of pedestal

Figure 3-201

2) Remove the deck stopper plate.

Figure 3-203

4) RemovetheE-ring, anddetachthepick-uproller

(front);thereafter, pulloutthepick-uproller(rear) together with its shaft.

@ Deck stopper plate

@ Mounting screw

Figure 3-202

@ E-ring

@ Pick-up roller (front)

@ Pick-up roller (rear)

Figure 3-204

COPYAIGHT 0 1902 CANUH ING.

CANON NPZl20/2WZO RN.0 MAY 192.0 PNINTEO IN JAPAN IIMPRIME AU JAPONI

3-l P

m MECHANICALSYSTEM

B. Feed Roller

1) Detach the deck.

2 ) Removethestopring,anddetachthefeedroller.

C. Separation Roller

1) Slide out the deck.

2) Open the right door of the pedestal.

3) Remove the two stop rings, and detach the separation roller.

@ Feed roller

0 Stop ring

Figure 3-205

Note:

Take care; the feed roller has its own orientation.

@ Stop ring (front) @ Stop ring (rear)

Figure 3-207

Figure 3-206

3-2P CopynIGHT 0 1932 CANON ING.

CANON NP2120/2MO NB.0 MAY 1990 PAINYEU IN JAPAN IIMPNIME AU JAPONI

D. Registration Roller

1 ) Detachthedeckdriveunit;seethediscussionon removing the deck drive unit. See p. 3-4P.

2) Remove the E-ring at the rear and the spring.

@ E-ring 0 Springs

Figure 3-208

3) Remove the E-ring at the front, and detach the gear; thereafter, detach the registration roller.

MECHANICALSYSTEM

0 E-ring

Q Spring

@ Gear

@ Registration roller

Figure 3-209

COPYAIGHT 0 1592 CANON INC.

CANON NR,ZO/ZWO RN.0 MAY IPJO PAINm I N JAPAN IIMPAIME AU JAPON]

3-3P

si.

RWE SYSTE

A. Deck Drive Unìt

1)

2)

3)

Detach the right cover and right door from the copier.

Detach the rear cover from the pedestal.

Remove the four connectors and two fastons from the paper deck PCB.

6) Detach the right door from the pedestal

@ Strap

Q Right door of pedestal

Figure 3-212

7) Remove the four mounting screws, and pull the deck drive unit to the front to detach.

@ Connectors (Ji, J2, J3, J4)

@ Fastons

Figure 3-210

4) Detach the deck stopper plate, and pull out the deck.

5) Detach the right cover from the pedestal.

@ Mounting screws

@ Deck drive unit

Figure 3-213

@ Mounting screws

@ Right cover of pedestal

Figure 3-211

COPYAIGHT 0 1592 CANON INC.

CANON NPZi20/2O70 RN.0 MAY 1990 PAINYEO IN JAPAN [IMPRIME AU JAPONI 3-4P

The registration at the front and rear for the pedestal should be as shown in Figure 3-214.

Iftheregistrationisotherwise, makethefollowing adjustments.

MECHANICALSYSTEM m

A. Making Adjustments

1) Slide out the deck.

Figure 3-214

Figure 3-215

2) Loosen the four mounting screws on the front cover and the four mounting screws on the grip plate.

Grip plate Mounting screws

Grip plata

Mounting screws for

Iront caver

COPYRIGNI 0 1992 CANON ING.

Figure 3-216

C A N O N NPZl20/2070 RN.0 MB 1590 PRINTED IN JAPAN IIMPRIME AU JAPONI 3-5P

B MECHANICALSYSTEM

3) Slide the grip plate in parallel to the body, and adjust the registration at the front and rear.

Decrease the non-image width at the rear; increases the nonimage width at tk front.

Decrease the non-image width a, lhe front; increases he nonimage widh at the rear.

6) Make copies using the paper deck.

7) Repeat steps3) to 6) if the registration is outside the standards.

8) Fix the front cover so that the gap between the front cover and pedestal frame is about 0.5 mm.

0.5 mm (approx.)

I

Pedestal frame

Front cover about 1 mm.

l

Figure 3-217

4) Tighten the four mounting screws on the grip plate after adjustments.

5) Set the deck.

Note:

Slide it to the front thereafter, without releas-

íng the latch.

3-6P cOPYRIGHT 0 1992 CANON ING.

CANON NP2l20/2G20 RN.0 MAY 1990 PRINTUI IN JAPAN IIMPRIME AU JAPONI

Thepaperdeckcan bemodifiedtosuit thesizeof the paper to be used (A4 or LTR) by relocating the three partitions and resetting the DIP switch.

Modifying the Deck Size

1) Detach the rear cover from the pedestal.

2) Detach thestopper plate, and take out the deck.

MECHANICALSYSTEM

3) Detach the three partitions.

4) Fit the partitions into the holes corresponding to the desired size.

n Use a sheet of thedesired size as referente to facilitate the work.

LTR

TA4

A4

LTR.

Figure 3-219

Figure 3-220

Figure 3-221

5 ) ResettheDIPswitchonthedeckcontrollerPCB.

LEtter A4

Figure 3-222

6) Setthedeck,attachthestopperplate, andattach the rear cover.

COPYNICNT Q 1592 CANON I N C .

CANON NPa20,2MO RN.0 MAY 1930 PNINNI I N JAPAN IIMPAIME AU JAPONI 3-7P

CHAPTER 4

MAINTENANCE AND SERVICING

1.

PARTS TO BE REPIACED

PERIODICALLY _.........__._...................... 4-1 P

II.

CONSUMABLES __._......____....................

4-i P

COPYRIGNT 0 1992 CdNON ING.

III. PERIODICALSERVICING

CHART . . . . . . . . .._.______...............................

CANON NP2l20,2WO R N . 0 MAY 1990 PGINTEG I N JAPAN IIMPRIME AU JAPONI

4-1P

M A I N T E N A N C E A N D S E R V I C I N G M

There are no parts in the Paper Deck pedestal which must be replaced periodically

I I . CQN%UMABEES

The table below shows the average life (in terms of estimated number of copies) of parts that may require replacement at least once within the warranty period dueto deterioration, wear, or damage.

No.

1

Parts name

Pick-up roller

2 Feed roller

3

4

Retard roller

In-deck registration roller

Parts No.

FF9-1003-000

FL9-0015000

FL9-001 O-000

FA5-8409-000 1

1

Q’ty

1

2

Life

100,000 as of March 26, 1990

Remarks

100,000

100,000

300,000

Note:

The figures in the table are estimated values and may be changed with operating experience.

Tabfe 4-l

A: Clean 0: Replace x: Oil II: Adjust

Name of

Unit

Section

Pi&up roller bushing

Interval every 100,000 copies

X

+: Inspect

Remarks

Apply oil

COPYAIGHT 0 1592 CANON ING.

CANON NPZ12012MO RE”.0 MAY 1990 PRINTEO IN JAPAN (IMPAIME AU JAPONI 4-l P

APPENDIX

1.

ARRANGEMENT AND FUNCTIONS

OF ELECTRICAL PARTS.. .................... A-l P

II.

VARIABLE RESISTOR (VR), LED,

AND CHECK PIN BY PCB .................... A-3P

COPYAIGHT 0 1952 CANON ING.

III. DC CONTAOLLER ................................ A-5P

CANON NPZlZO/ZMO KV.0 MB 1590 PRINTEO IN JAPAN IIMPRIME AU JAPONI

A P P E N D I X

COPYRIGNT 0 1992 CANON INC CANDN NPz120/2020 MV.0 AMI 1990 PRINTUI I N JAPAN ( I M P R I M E AU JAPONI

A-IP

Symbol Name

Photointerrupter

Microswitch

0

M

M o t o r

Clutch CL

0

Solenoid

Pedestal driver PCB

Notation

021

Q22

Q23

Function

.Paper sensor

Pre-registration sensor

Lifter position sensor

MS1

MS2

Ml

Upper limit switch

Door openlclosed switch

Deck motor

CL1

CL2

CL3

SLI

0

Lifter clutch

Pick-up clutch

Registration roller clutch

Pick-up roller release solenoid

Drives each load in the pedestal.

A-2P

COPYRIGHT 0 1542 C A N O N ING.

C A N O N NPZl20/2RZO R N . 0 MAY INO PRINTEO I N J A P A N IIMPAIME AU JAPOI

Discussion will be limited to thevariable resistors (VR), LEDs, and checkpins that can be used in the field from among those the copying machine is equipped with.

Those not discussed are for adjustment at the factory only, and adjustments and checks using them call for special tools and instruments as well as high accuracy. Do not touch them in the fields.

Note:

1. Some LEDs emit light even when OFF because of leakage current.

2. VRs that may be used in the field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VRs that may not be used in the fíeld . . . . . . . . . . . . . . ..___..............................................................

0

@

1. Deck Controller

1

0

Jl

2

1

IRI

54 81J341 52 ’

3 J5 1

El

COPYAIGHT 0 1532 C A N O N INC.

C A N O N NPZ120/2620 nN.

MRY 1930 Pnitim I N

JAPAN IIMPAIME Au JAPONI

A-3P

Prepared by

COPYING MACHINE TECHNICAL INFORMATION DEPT.

COPYING MACHINE TECHNICAL INFORMATION DIV.

CANON INC.

Prlnted In Japan

REVISION 0 (MAY 1990) [26313]

REVISION 1 (JAN. 1992) 1263131

REVISION 2 (DEC. 1992) [26313/16756]

890-12, Kashlmada, Salwal-ku, Kawasakl-shl, Kanagawa 211 Japan

d

I I

/<C..