[9] operations and functions

[9] operations and functions
FO-2850
[9] OPERATIONS AND FUNCTIONS
(Printer section)
1. Print process
A. Image forming process
Normal paper is used as print paper. A laser beam is used to expose
on the OPC surface to form latent electrostatic images, which are
developed into visible images (toner images) and are transferred on
paper. The basic operation is composed of the five processes: charg-
ing, exposure, development, transfer, and cleaning.
B. System diagram
Laser
, beam
Scanning я Laser beam
mirror generator «
Mirrors
Toner
DC-950V
АСВОО\(Р-Р)
Develo-
ping
roller
Photoconductor
drum
«“— ———— Paper
Transfer
roller
|
Separation
electrode
DC+2100V
AC600V(P-P)
DC-390V
I
Image
data
/ Control board
High voltage
section
+= Y
CPU
1С304
B3
T1/CR
54 MCON
43 TC/BiasON 3
>
Driver
1С303
С. Image forming process diagram
High voltage
circuit
y
Main charger
rus
T491
Trans
T402
Trans
т
Scanning
mirror
— Lens
4 Laser diode
Mirror
Exposure
(cleaning Charge )
Development
cleaning
Separation
Es
FO-2850
Charger
rolier
Transfer roller
Doctor
Developing
roller
Grounding sheet
Toner
Developing High voltage
roller circuit
Transfer
Separation
electrode
Heat roller
Heat seal
| Heater lamp |
| Transfer roller |
| High voltage circuit |
Paper feed roller te Paper tray || Paper |
I
FO-2850
D. Functions and operations of major parts
M Developing rolier | @ | Grounding sheet | Gi | Toner seal
© | Doctor (7 | Toner seal (2 | Main charger
brush
© | Toner stirring Transfer roller (3) | Toner seal
plate
(4) | Scraper © | Separation
electrode
(5) | Toner supply OPC drum
roller
(1) OPC drum unit
The OPC drum is charged and latent electrostatic images are formed
on it and developed into visible toner images.
a. OPC drum
Latent electrostatic images are formed and developed into toner im-
ages on the OPC drum.
Organic Photo Conductor is used. The OPC surface is charged nega-
tively by the main charger brush.
When the OPC is exposed to laser beam, the electric resistance of
the exposed section falls and electric charge is generated in the OPC.
As a result, electric charge on the OPC surface is removed. This
principle is used to form latent electrostatic images.
= CTL (Charge transfer layer)
OPC ayer _
= +- CGL (Charge generation layer)
(17um)
: <— Aluminum layer
b. Main charger brush
The main charger brush charges the OPC drum surface. It is com-
posed of brush fibre, and is in the shape of a roller. À high voltage of
AC 600V (P-P) and DC —950V are applied to charge the brush.
The main charger brush is in contact with the OPC drum. By applying
electric charge to the OPC drum, the OPC drum is charged to about
—1kV.
c. Toner seal
The OPC drum unit is provided with two toner seals, which prevent
leakage of toner remaining in the OPC drum unit.
(2) Developing unit
Latent electrostatic images formed by laser beam on the OPC drum
are developed to visible images by the developing unit. Toner is filied
in the developing unit.
a. Developing roller
The developing roller is made of urethane and has a high electric
resistance. It is flexible and is in close contact with the OPC drum.
Toner on the developing roller is attached to latent electrostatic im-
ages on the OPC drum to form visible images on the OPC drum.
A voltage of DC -400V is applied to the developing roller.
b. Doctor
The doctor is in close contact with the developing roller. It adjusts
toner quantity on the developer roller surface.
The doctor is made of conductive material.
c. Toner supply roller
The cross section is polygonal, which is utilized to transport toner to
the developing roller.
d. Toner stirring plate
This plate stirs toner in the developing unit to transport it to the
developing roller smoothly.
e. Scraper
The scraper guides toner transported from the toner supply roller to
the doctor. Excess toner which is not transported to the doctor is
returned by the scraper.
f. Grounding sheet
The grounding sheet is made of conductive material. It is in contact
with the developing roller to —300V potential on the developing roller
after developing, maintaining the potential at a constant level.
g. Toner seal
The toner seal prevents t toner from leaking outside the developing
unit.
(3) Transfer charger roller
The transfer charger roller is made of urethane and has a high
electric resistance. It is flexible and is in close contact with the OPC
drum.
A high voltage of AC 600V (P-P) and DC +2100V are applied to
charge.
It positively charges paper transported from the paper feed section,
whch transfers negatively charged toner on the OPC drum onto the
paper.
(4) Separation electrode
This electrode is connected to the drum ground. It discharges paper
which was positively charged in the transfer section to reduce the
potential difference with the OPC drum to reduce static electricity
between the paper and the OPC drum, thus facilitating separation of
paper.
(5) High voltage unit (in the control PWB)
A high voltage is generated by the invertor system, and is supplied to
the main charger unit, the transfer charger unit, and the developing
roiler.
E. Image forming operation
STEP 1 (Cleaning, Charging): Residual toner on the OPC drum is
stirred and negative charges are
scattered evenly on the OPC drum.
(The OPC drum surface is evenly
charged.)
The main charger is a rotating brush roller.
The main charger removes residual toner from the OPC drum by its
rotating sweeping action and causes it to stick to the brush.
At the same time, a high voltage of —950V is applied to the main
charger roller to generate a discharge of electricity between the roller
and the OPC drum, generating positive and negative charges. The
negative charges are attracted to the OPC drum, and eveniy dis-
tributed on the OPC drum. (The OPC drum surface is evenly
charged.)
Main charger brush
Residual
AC600V toner
(P-P)
©
OPC drum
____ DbC-9s0v
CTL | Aluminum layer (drum base)
|-> 1 1
200v \ TTC
un
T7
\ J
FO-2850
STEP 2 (Exposure): Laser beam scanning light corresponding to
the print data is radiated on the OPC drum.
Positive and negative charges are generated in the OPC drum CGL
exposed with the laser beam .
Positive charges generated in the CGL are attracted toward the OPC
drum surface (negative charges), and negative charges toward the
aluminium layer {positive charges).
Therefore, the positive and negative charges neutralize each other in
the laser-exposed area of the OPC drum surface and the aluminium
layer, decreasing the potential of the OPC drum surface.
The area which is not exposed to laser beam has no change, and the
OPC drum surface remains negatively charged to keep a high poten-
tial. As a result, latent electrostatic images are formed on the OPC
drum.
Laser beam
Non-exposed area
Exposed area
Aluminum layer
1 {Drum base)
Aluminum layer
\_ (Drum base)
FO-2850
STEP 3 (Development): Toner is attached to the latent electrostatic
images on the OPC drum to form visible
images.
( >
Doctor
: Toner (Negatively charged)
Ро Р
“acte
Developing roller “Фо
LOS ON
se Ca
Scraper
Toner supply rolier
OPC drum N
Grounding sheet
Exposed area
(Exposed to laser beam)
DC —
-390V
|
Non-exposed area
(Not exposed to laser beam)
A (+).
Ramps
(Dre
OOOO
Aluminum layer и 7 / госу TT
(Drum base)
N 7
Toner is transported to the scraper area by the toner supply roller and
the developing roller. The quantity of toner to be transported to the
doctor section is controlled by the scraper. Toner transported to the
doctor section is then passed between the developing roller and the
doctor to form a thin toner layer on the developing roller by the
pressure applied by the doctor.
When toner passes between the developing roller and the doctor, it is
charged negatively by friction.
When an area of OPC drum which was exposed to laser beam and
lost its charge comes in contact with the developing roller, toner
moves from the developing roller to the OPC drum surface.
The principle of toner movement from the developing roller to the
OPC drum surface is as follows.
The bias voltage of DC-390V is applied to the developing roller.
Toner is charged negatively by the difference (electrical energy) be-
tween the bias voltage and the OPC drum surface potential and is
attracted to the OPC drum surface which is positively charged.
At that time, the potential of the area of the OPC drum which was
exposed to the laser beam and lost its charge is higher than that of
the developing roller.
On the other hand, when an area of OPC drum which was not ex-
posed to the laser beam and did not lose its charge comes in contact
with the developing roller, any residual toner attached to the OPC
drum is transferred to the developing roller which is more positively
charged .
As a result, unnecessary toner on the OPC drum is collected by the
developing unit.
The operating principle for that case is contrary to that for transfer of
toner from the developing roller to the OPC drum surface. (The
electric field energy direction is contrary.)
STEP 4 (Transfer): Visible images of toner on the OPC drum are
transferred to the paper.
Aluminum layer
(Drum base)
OPC drum
ZZ
2960 0)
x. Ty o (+)
CRIS ESSOR
“Ram DERE A D Paper
D
SEDO
7
-— 200V
Г.
Transfer roller
DC+2100V
AC600V(P-P)
+
Nu“ 7
The high voltage of DC+2100V plus AC600V (P-P) is applied to the
transfer roller to generate electric discharge between the roller and
the OPC drum, generating positive and negative charges. Positive
charges are attracted to the OPC drum and attached to the paper
transported between the transfer roller and the OPC drum. Therefore
the paper has a strong positive charge.
Negatively charged toner on the OPC drum is attracted by the paper
which is positively charged, and the visible images of toner are trans-
ferred onto the paper.
|
FO-2850
STEP 5 (Paper separation): The paper is separated from the OPC STEP 6 (Cleaning): Residual toner on the OPC drum is removed.
drum.
7 >
Main charger roller (brush)
@ Aluminum layer
(Drum base}
7 CGL
AC600V
(P-P)
~ Residual
| o toner
Separation
electroda
OPC drum
— DE-950V
CTL Aluminum layer (Drum base)
There is an electrostatic force between the paper which is positively >
charged in transfer operation and the OPC drum which is negatively |
charged. The positive charge on the paper is discharged by the E
separation electrode, which is the same potential as the aluminium |
layer of the OPC drum, to reduce the potential difference between the |
OPC drum and the paper, reducing the electrostatic force.
This operation facilitates separation of the paper from the OPC drum.
Transfer rolier
N J N
CGL
TT
— 7
The main charger is a rotating brush roller.
The main charger removes residual toner and paper dust from the
OPC drum by its sweeping action. It stirs residual toner and paper
dust and charges them to be attached to the OPC drum again.
FO-2850
F. OPC drum surface potential
(1) Transition of OPC drum surface potential by print
operation
OL ©
У /
Laser beam
Dark area
WA potential
-950V—
=
<
Е
D
© X ;
an " i
GT Ы ,
-400V— 2— ет т ; -—
E | 1
о В + : Developing
5 ‘ : bias
O
Li ht area
potential
Charging/ Exposure Residual Transfer Charging
cleaning toner collection
/Developing
——
Timer (OPC drum rotating angle)
(2) OPC drum surface potential and developing bias
voltage in development
Y
During
Start developing Stop
Dark area
potential
-ACOV
Developing
bias ;
hd Бей ee
OPC drum surface potential (-V)
|
Light area potential
Time (OPC drum rotation angle)
2. Paper transportation in printing
/
Paper feed cluich
2
70
i 1 Us
Paper exit DI AA Paper empty
roller | Ta y CHE | | sensor
Yu “ОЙ Te < AN ae Paper feed
TE = tray
ef > || al Paper separation
a \ | sheet
7 —
Paper out sensor Paperin sensor Paper feed roller
3. Paper transport in scanning
FO-2850
A. Electrical connection
In the paper feed and transportation system, drive parts and sensors
are connected as shown in the figure below.
CPU
1C301 CN303
1 MCA 1 3
B4 Motor 1 | MA
B5 2 _MCA- 9 y driver |" >| 2 | MA-
3 MCB 1 3 MAIN MOTOR
86 14 yes 9 | 1©30° |; 3 | MB
B7 - » Motor 4 | MB-
driver
[+13V]
CN304
11+13V |
41 PUS 2 |1C303 |_15 PAPER
T1/PWM2 2 | PUS PICK-UP SOLENOI
|
|
|
|
ез (or РМ PAPER IN |
SENSOR |
|
|
|
a POT BAREROUT
| LSU PWB
|
|
|
33 PE CN301 | CN601 PAPER
E2 [9] PE | [9] PE | — SENSOR
{
|
* The main motor, which is the drive source for the paper feed and Paper out sensor: (Transmission photo transistor):
transportation system, is a 4-phase stepping motor in 2-phase
This sensor senses paper exit, and paper jam.
excitement bipolar system. The step angle is 7.5”. Pap Paper]
* The pick-up solenoid operates on 12V to turn on/off paper feed.
B. Paper supply block
1) Specifications
* Multi purpose paper supply tray
* There are following kinds of sensors.
* 100-sheet capacity (60 to 80 g/m? or about 16 to 21 Ibs, max.
11mm total thickness)
* Paper weight: 60 ~ 128g/m?
* Kinds of papers: Refer to "1. Papers" in "[5] SUPPLIES".
2) Operations
This unit uses the multi purpose paper supply tray which allows paper
feed from manual feed to continuous feed.
п
Z&— — Paper empty sensor
LA »
; Paper in sensor
Paper out sensor
Paper empty sensor (Transmission photo transistor):
The paper empty sensor is positioned on the LSU PWB, and is
used to detect presence of paper on the multi-purpose paper tray.
Paper in sensor (Transmission photo transistor):
This sensor is used to detect the paper feed timing of the next
paper (in prefeed) and to make synchronization between paper
transport and image forming on the drum. This sensor is also used
to detect paper jams.
FO-2850
a. Paper support/Paper support extension
A
When setting paper, extend the paper tray.
If the paper quantity is great, attach the paper cover.
b. Paper guide
Print face
Paper guide
Slide the paper guide to fit with the paper width as shown. lt
covers the paper width from the letter width (8 1/2", max.) to the
monarch width (3 7/8", min.).
c. Paper release lever
(Paper release)
(Paper fixed)
When setting paper, first release the paper with the paper release
lever and set the paper width with the paper guide, then fix the
paper. To release the paper, pull the lever toward you as shown.
To fix, push the lever backward as shown. The mechanism of the
lever is as shown below.
(Operation in the paper release mode)
Notch
Ts
N — Paper feed tre
Lower frame LA |
1
Lock lever arm
Lock lever
Spring
Paper feed tray
Paper release lever
Paper feed
roller
Paper feed clutch
Clearance
The lock lever arm is always pressed on the paper tray by the
spring. By pulling the paper release lever toward you, the lock
lever arm enters the notch section of the paper tray so that the
lever is fixed at the paper release position. Under this state as
shown, there is a clearance between the paper feed roller and the
paper tray to allow to shift the paper.
Paper release
lever
Paper feed rolier gear
Paper feed tray
Paper release
lever
Paper feed
Paper feed clutch
(Operation when paper is fixed)
By pushing down the paper release lever for the paper release
state, the paper release lever arm pushes the lock lever arm in the
direction of (A).
By the above operation, the paper tray is pushed down and the
paper is pressed by the paper feed rolier.
H printing is made without pushing down the paper release lever,
the lock lever arm is pushed back by the paper feed roiler gear
boss, so that the paper tray is put down to fix the paper.
C. Paper feed block
1) Operations
* The paper feed block picks up a paper in the paper tray and
transport it through the print process block to the fusing block.
Paper feed roller
Paper feed
solenoid
Paper feed
clutch
FO-2850
a. Paper feed solenoid/Paper feed clutch
Paper feed solenoid
Paper feed _
clutch
The paper feed solenoid turns on/off the paper feed clutch. When
the paper feed solenoid is turned on, the paper feed roller rotates.
Paper feed roller
Paper feed clutch
The paper feed clutch is a spring clutch. The rotation of the paper
feed roller gear is transmitted to the paper feed roller only in the
direction of (A), that is, the paper feed roller is rotated only in the
direction of (A) (paper feed direction).
b. Paper feed roller
Paper feed roller
Separation plate
The paper feed roller is of circular shape, and the separation plate
prevents against double feeding.
FO-2850
Cc. Sleeve release lever
Sleeve release lever
Clutch R sleeve
The sleeve release lever is provided for preventing against
reverse rotation of the paper feed roller. It is engaged with the
clutch R sleeve teeth when not in paper feed.
When removing paper for replacement of paper, a reverse rotating
force is applied to the paper feed roller. In this case, the paper
feed solenoid itself provides enough prevention against reverse
rotation, but an unnecessary force is applied to the spring clutch
so that the spring clutch may be broken. Therefore the sleeve
release lever is locked so as not to apply an unnecessary force to
the spring clutch.
D. Paper exit block
1) Specifications
* Selection is available between the face-down output and the face-
up output.
* Face-down output: Available with the 100-sheet capacity tray
(80g/cm?).
Available without tray (For transparency films,
label sheets, thick paper, and envelopes, use
the face-up output.)
® Face-up output:
9-11
2) Operations
Paper exit
follower roller
Paper exit
roller upper
Face-up output
cover Paper exit roller lower
Face-up follower roller
a Paper exit roller lower/Face-up follower roller
Lower paper exit
roller
Spring
Face up follower
roller
After fusing, the paper is fed to the paper exit roller for face-up
output or face-down output.
The face-up follower roller is in contact with the paper exit roller
lower with the spring which is inside the roller.
I
FO-2850
b Paper exit roller upper/Paper exit follower roller | C Face-up output cover
This cover selects face-down output and the face-up output.
a NN When the cover is closed, face-down output is performed. When
the cover is open, face-up output. |
The face-down output and the face-up output by closing/opening
the cover are described below.
N /
Plate spring
7
7 /- Upper paper
Paper exit —£ @ exit roller Paper
follower \ |
roller
(Face-up output) (Face-down paper output)
(Face-down output)
When the face-up output cover is closed, the paper is passed
along the inside shape of the face-down output cover to the upper
side, being discharged to the face-down output tray.
(Face-up output)
This roller is used to discharge the paper to the face-down output When the face-up output cover is opened, the paper is discharged
tray. The paper exit follower roller is installed to the plate spring, from between the face-up output cover and the lower frame.
and is pressed onto the paper exit roller upper by the spring.
E. Timing chart
Unit: sec
|
DREADY _
DPAGE_
MM
PUS
PIN_
POUT_
: 8.92 | ‘
« —” (11.2... Letter size) : 6.0
al.
Ч
"
y
PGCMD
vence Un “A
PFCMD M
PFACK m
@ When the print start command (DPAGE_: L) is received with the @ Paper in sensor is turned on (PIN_: L) to synchronize paper
printer at READY state (DREADY_:H), the main motor is driven transport and transfer of images on the drum. That is, print data
(MM: H). writing to the drum (forming of latent electrostatic images by laser
@ When the print process control section is ready, the paper feed beams) is started. | |
solenoid is turned on (PUS: H) to pick up a paper. @ Transfer and fusing are performed, and the lead edge of the paper
turns on the paper out sensor (POUT _: L).
9-12
FO-2850
® In continuous printing, the prefeed command (OA2H) is received.
(When the print start command (DPAGE. :L) is received, the page
command (OAFH) is received. If the prefeed command is received
in advance of reception of the page command, the prefeed com-
mand is ignored.
In continuous printing:
1) When the prefeed command (OA2H) is received:
On reception of the prefeed command (OA2H), the prefeed
acknowledge status (OA2H) is sent back.
Without waiting for DPAGE_:H, after 0.49sec from the 1st PIN
sensor OFF or after 0.1sec from the 2nd PIN sensor OFF,
pick-up is started. (Though pick-up is started after receiving the
prefeed command, if DPAGE_:L is not obtained until
PRSTT:H, white paper is discharged.)
2) When the prefeed command (OA2H) is not received:
When the print start command (DPAGE_:L) is received, pick-
up is started.
Procedures ~ @ are repeated again.
® The paper out sensor is turned off (POUT_: H) to discharge the
first paper.
(7) The main motor is stopped (MM: L) to terminate printing.
A. Composition
4. Optical system
The optical system converts print data into laser beams to form latent
electrostatic images on the drum.
Start position detector board Third reflection mirror
Laser diode and
collimator lens
Second reflection mirror
First cylinder lens
Curved mirror)
Scanning mirror :
Scanning motor
This model employs the optical system of 600dpi.
Part name
Description
Laser control PWB
The circuit system is composed of the laser control driver and the APC (Auto Power Control) circuit. It controls
the laser diode. In addition, a photo transistor is provided to sense paper empty. The PWB aiso includes the
laser diode and the collimator lens.
Laser diode and collimator lens
The laser diode emits 780nm infrared semiconductor laser beams under the control by the laser control PWB.
The collimator lens focus laser beams emitted from the laser diode onto the photoconductor drum.
First cylinder lens
Used to focus onto the photoconductor drum.
Scanning motor
Used to rotate the scanning mirror. Driven by the drive signal (PMD) from the PCU, and controlled in
synchronization with the clock signal (PMCLK). The motor speed is 17716.5rpm.
Scanning mirror
The scanning mirror is of two-surface, and refiects laser beams to the main scanning direction.
By this operation, two-line printing is made for one rotation of the scanning motor.
First mirror
This mirror reflects laser beams to the curved mirror.
Laser beam sensor PWB
The PWB detects laser beams for vertical synchronization.
The photo sensor on the PWB detects laser beams to generate the SYNC signal.
Second mirror (Curved mirror)
This mirror reflects laser beams to the third reflection mirror in parallel and in even interval regardless of
difference in angles of incidence from the first reflection mirror.
Third mirror
This mirror reflects laser beams reflected from the curved mirror to the photoconductor drum.
Second cylinder
This lens is used to correct blur of images caused by variations in the installing angle of the scanning mirror.
B. Block diagram
Scanning motor drive signal (PMD,PMCLK)
; First
VIDEO Laser diode of Laser | I Collimater }|__ ,
[Pou control circuit diode » lens >] cylinder
7 lens
SYNC Second mirror ; , Motor
Photo sensor a (Curved mirror) 4-1 First mirror k mirror a —
Second
cylinder (4-1 Third mirror
lens
+ Signal
+ Laser beam
9-13
C. Electrical connection
FO-2850
Main PWB
C304 |
CPU |
CN301 |
13, 1{+13V
2 | GND
INT2 L10_LEND 11,0 1c30s [84 3 VIDEO
Ca GND
9
INT SYNC 5 |SYNC-
7 APCSTT
T2/CR PMCLK 4h 6 | APCSTT
T2/PWM1 - PMD 7 |PMCLK
T2/PWM2 AN 8 | PMD-
|
|
|
|
|
ao |17_PRSTT |
|
|
|
Sen |
DDATA- [23 |
CN305 |
21 |
|
12 |
|
12 13 6
HSYNC- |+ e |
|
IC305 10305 |
|
|
D. Operational description
The laser diode control board is driven in synchronization with the
VIDEO signal sent from the PCU board,
By the operation of the laser diode control board, infrared laser
beams of 780nm are outputted from the laser diode and made in
parallel by the collimator lens, and focused onto the scanning motor
by the first cylinder lens.
The scanning mirror rotation is controlled by the scanning motor to be
constant at 17716.5rpm, and the laser beam is directed to the main
scanning direction.
The scanning motor is of two-surface, and two-line print is made for
one rotation of the scanning motor. The laser beam reflected by the
scanning mirror is directed to the curved mirror by the first reflection
mirror. Before reaching the curved mirror, the laser beam enters the
photo sensor on the start position detector board, making vertical
synchronization-and print data synchronization (generating the SYNC
signal).
The curved mirror directs the laser beam to the second reflection
mirror in parallel and in even interval regardless of difference in
angles of incidence from the first reflection mirror. The laser beam
reflected by the second reflection mirror ia passed through the
second cylinder lens to reach the photoconductor drum.
The second cylinder lens corrects blur of the images caused by varia-
tions in the installing angle due to the two-surface scanning mirror,
providing stable laser beams to the photoconductor drum for each
line.
9-14
LSU PWB | Laser beam detecting PWB
| | (Start position detecting PWB)
CN601 1C603 CN603 CN604
1 |+13v|-— terminal 1 |+5VL 1 |+5VL
2 | GND |— reguistor 2 | SYNC_ 2 | SYNC_
3 [VIDEO 2 3 | GND 3 | GND
4 | GND
5 ISYNC-le ue
6 | APCSIT
7 |\PMCLK +1av
8 |PMD-
CN602
1 4 | +13V}—— Scanning motor”
|
|->
Np
|
_
{APC circuit)
5 fr
= 5 D |0
4 = O /PD
GND |
I 1C601 M 8,
Ow
O QO
> >
75 (reo)
| +5VL |
FO-2850
5. Fusing section
After transfer, toner on the paper is heated and fused in the fusing
section. This machine employs the heat roller pressure pad system
for fusing.
Heater lamp Temperature
fuse 1 (132 °C)
Temperature
fuse 2 (187 °C)
Thermistor
Heat roller
Tefion sheet
Pressure pad
A. Electrical connection
Heat roller:
Heater lamp:
Pressure spring:
Teflon sheet and
pressure pad:
Thermistor:
Temperature fuse 1
(132°C):
Temperature fuse 2
(187°C):
Power section
This roller is made of aluminum tube (14mm
diameter and 0.5mm thickness) coated with
teflon which has a high friction coefficient (for
greater transport force) and a high separation
capacity.
The 400W halogen lamp is used.
This spring presses the heat roller with a
690g pressure on one side.
The pressure pad is covered with the teflon
sheet for smooth paper transport when
fusing. The employment of the pressure pad
and the teflon sheet allows fusing in a low
pressure.
Thermistor of chip type with good response is
used to respond to rapid heating (rapid warm-
up of about 8sec) of the heat roller. '
Temperature fuse 1 is installed to the fusing
cover. It blows off when the ambient tempera-
ture of the fusing cover rises abnormally
(132°C).
Temperature fuse 2 is in close contact with
the heat roller. It blows off when the heat
roller temperature rises abnormally high
(187°C).
| Fusing section
CN4
| 1 | HLL
Temperature Sr
[+13V] fuse (132 'C) '6!
CN202 |
1 1+13V
3 1+13VS Heater
+ \ lamp
151
| |
ve
Temperature
CNS fuse (187 "C).
AC
—{i Trin
Thermistor
PCU section
1С304
CPU
Bo 53 HLON 4 IC303 13 HLON-
Driver
SCICLK 48 PR 1 16 PR-
32 RT
AN1 [= H
+5V
CN302
| » 1] +5V
21 RTH №
B. Operations (Fusing temperature control)
This machine used two thermistors; one is in close contact with the
heat roller to detect the heat roller temperature. The other is installed
on the main control PWB and detects the room temperature.
The heat roller temperature is controlled by these two data.
(Temperature control is performed by turning on/off the heater lamp.)
For example, the heat roller temperature is controlied to 161°C when
the ambient temperature is 25°C. When the ambient temperature
falls, the heat roller temperature is raised. When the ambient
temperature rises, the heat roller temperature is lowered.
9-15
O
(Scanner section)
Document set on the document tray are fed sequentially and the
document images are formed on the light reception element in the
reduction optical system of the light source, the lens, and the mirror.
When document are set on the document tray, P sensor detect the
documents to allow scanning. When scanning is started (by pressing
the START key when copying or FAX sending), the separation roller
rotates to feed the document the roller. When two or more document
are set on the document tray, the first document is fed by the roller
rotation, but the second document is stopped by the sheet. Only the
first document (which is in contact with the separation roller) is fed.
The fed document is squeezed by the paper feed roller to be fed
further. The feeding amount of the paper feed rolier is greater than
that of the separation roller. When the former document is separated
from the separation roller and fed only by the paper feed roller, a
clearance is generated between the former document and the follow-
ing document. The PI sensor turns ON and OFF in this clearance to
detect the lead edge and the rear edge of the document. The separa-
tion rolier and the paper feed roller and the paper exit roller differ in
the paper feed amount. (The paper feed roller and the paper exit
rolier are the same roller.)
The separation roller is provided with the spring clutch (separation
gear ass'y) to race the separation roller when a faster rotating power
than the roller rotation is applied to the document in the paper feed
direction when the document is between the both rollers in order to
avoid stretching the paper by the both rollers.
When the document fed by the paper feed roller passes the Pl sen-
sor, the document lead edge is detected. This position is used as the
reference for scanning. For scanning, the reflection light of the light
source from the document is passed to mirror (1) and mirror (2) and
then to the lens to form images on the light reception element on the
CCD PWB. The scanning resolution is 300DPI, the document feed
pitch is 600DPI.
1. Scanner optical system
Outline
The light from the LED light source is radiated to the document and
the reflected light is reflected by the mirror. The reflected light is
passed through the lens to the CCD to scan the image data.
— ) Scanner motor
White balance sheet
Document
Paper exit
roller
Feed roller —
LED Lamp —p
Mirror
Mirror Lens
CCD
Scanner drive system
The ORSEN sensor detects the presence of originals on the ADF.
The PISEN sensor, positioned in front of the scanning line, detects
the position of the fed original. The scanner motor drives the separa-
tion roller, the feed roller, and the paper exit roller by gear transmis-
sion. Only the separation roller provides slower original feeding speed
to keep a distance between originals.
The control time chart is shown below.
FO-2850
2. Mechanism
Figure shows the sequence of the scanning process for the original.
The scanner unit can start the scanning process when the OR Sensor
detects "L" (there are some originals on the Original Tray), the Pi
Sensor detects “H“ (no paper in the paper path). After the Controller
confirms the above condition, the OR Motor for feeding the paper is
rotated in the normal direction at the Feed Speed, and is kept rotating
until the P| Sensor is switched to "L".
After the Pl Sensor is switched to "L“, the rotating speed of the
Scanner Motor is slowed down in accordance with the scanning
speed, and the Pre-scanning and Scanning are performed.
After the completion of the scanning process, the Scanner Motor is
speeded up to the feed speed again until the original is ejected.
The Controller PWB firmware provides the Scanner Motor with a 1-2
phase drive mode all the time, and controls the driving current-of the
Scanner Motor with the CURO and the CUR1 signals of motor drive
IC in accordance with the rotating speed of the Scanner Motor.
ORSEN- | Original paper empty
PISEN- | 1st Original | E Original |
at CCD
Original papers are remained
White | 1stOriginat | White
Scan speed Scan speed
Motor sep / N an Ne
CURO-
| 2nd Original | White
CUR1-
Pick
Scanning u
¡E
Paper
Scanning eject
9-16
FO-2850
(Electrical section)
1. Functional block diagram
[ram]
Panel PWB
Motor
!
CCD PWB
NCU
PSTN
| FX164 | | Fx200 | | Main Memory |
|
CPU Bus
[FF]
ems] Image. [Bus
—-.LC82103 J
image.
Memo
LED
ASIC
18
AC filter
Rectifyin
moothin
1С105
Main switching
High voltage
generating circuit
-12VA
13V
Driver Fan
{over | Main motor
—| pre | - Solenoid
cpu t —{_ priver J Heater tam | Fusing unit
TMS377C08 control
APC PWB
SNA JOVAI
control
5\
| A4 sensor |
| Toner sensor |
| Interlock switch |
MAIN PWB
Distortion Multi value | Quiput | Lua
correction resolution ; !
conversion reduction control
CCD contr DRAM Image process
signal 96Kbit SANYO LC82103
Image memory
SANYO LC8213 256Kbit SRAM
Compression =
Bus interface
Exparsion
CPU P WPS ASIC ni)
NS FX164 o bit
Ú - —
1 f
= — System interface
& [Nibble |]
DRAM/DMA/ Timer (1658) Рерр
Interrupt/ ECP
Sigma Deita/
CorVUART
ontroller FIFO controller
Systern controller WPS buffer
NS FX200 r 4Mbit DRAM
Main memory ‘ Various control Bit map conversion
18Mbit DRAM regsters
| Margin contra || Parale > Sere! |
conversion
| Program 8M EPROM 4
| Scan motor control |
| Panel interface =
CCD control
Configuration RAM ;
ue
Clock IC [One — :
Line Line Lina
NJUESS5 | matching | | | | protection |
DC load Ring | Loop
detection current
— 3V lithium | detection
battery
NCU
Host PC
2. LSI pin layout
(1) NSFX200 (U37) pin layout
132-Pin FQFP Package
FO-2850
8 3 3 © | a 8 2 18 8 Е = 8 = 2 2 a ск = 8 ae Fw =
eS een Saa as23:ÉSIERISCICIESC
ALLA LN ELL TE LLE LEA E
1161154141184491114 401094081074 061054 04193, 02191400 92 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84
HBE — 117 83[— VCCA2
ADS ~{118 821— GNDA2
DDIN 4119 81E- PTMP
ADO — 120 80}— SBG
AD1 — 121 79}— SCVO
AD2 — 122 781— SVI
AD3 + 123 77}— GNDA1
AD4 — 124 76|— VCCA1
VCCD9 — 125 75|-- GNDD5
ADS — 126 74|— PMPHO
AD6 — 127 73}— PMPH1
AD7 — 128 72}— PMPH2
AD8 — 129 71}-- PMPH3
AD9 — 130 70}— SMPHO
GNDD9 — 131 69}— SMPH1
AD10 — 132 68|-— SMPH2
AD11 41 67|— SMPH3
AD12 42 66|— УССО5
AD13 +43 65|— PEXT
AD14 44 64|— PFAIL
VCCD1 —5 63|— SOSCO
AD15 6 62}— SOSCI
А16 —17 61}— RST
A17 —{8 60|— WDT
A18 19 59|— BUZCLK
A19 410 58/— DMRQ3
GNDD1 — 11 57|— MWSI
A20 — 12 56|— URXD
A21 413 55|— UTEN
A22 À 14 54|— PIOO
A23 — 15 53|— PIO1
PDO À 16 52}— SNH
VCCD2 — 17 51|— GNDD4
18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
LLE NU UY UL LU
= 2 = al = IM m .o 20 oO E E E + —_ A
TL/EE/11331-54
NSFX200 (U37) supplies input Signals
Signal Pin Numbers Description Signal Pin Numbers Description
GNDA1 ~ 2 77 82 Analog ground. CTTL 33 CPU Clock — CPU clock that
GNDD1 ~ 9 11 25 38 | Digital ground. is used for clocking the
51 75 90 NS32FX200.
102 116 131 DMRQ3 58 DMA Request — Input for
VCCA1~2 76 83 Analog Power — 5V supply DMA channel 3 request.
for analog circuits. FOSCI 36 High-Speed Oscillator —
VCCD1 ~ 9 5 17 32 | Digital Power — 5V supply for (49.1520 MHz) Asynchronous.
50 66 84 | digital circuits. When an external oscillator is
96 109 125 used, FOSCO should be left
unconnected or loaded with no
more than 5 pF of stray
capacitance.
HBE 117 High Byte Enable — Status
signal used to enable data
transfers on the most
significant byte of the data bus.
FO-2850
Signal
Pin Numbers
Description
HLDA
114
Hold Acknowledge — Issued
by the CPU to indicate it has
released the bus in response
to a HOLD request.
INTO ~3
40 41 42
43
Interrupt in — Asynchronous.
External maskabie prioritized
interrupt requests.
57
General purpose input pin.
64
Power Fall Indication — An
asynchronous signal which
forces the NS32FX 200 into
freeze mode.
PTMP
81
Not used.
RST
61
Reset In — Asynhronous reset
input from the CPU.
SBG
80
Not used.
SDIN
19
Sigma-Delta Data In —
Asynchronous input from the
SDC analog receiver.
SOSCI
62
Low-Speed Oscillator —
(3.2768 kHz or 455 kHz)
Asynchronous. When an
external oscillator is used,
SOSCO should be left
unconnected or loaded with no
more than 5 pF of stray
capacitance.
SVI
78
Scanner Video In — Analog
current from the scanner
sample and hold circuit.
URXD
56
UART Recelve —
Asynchronous input or general
purpose input pin.
UTEN
55
General purpose input pin.
Output Signals
Signal
Pin Numbers
Description
BUZCLK
59
Buzzer Clock —
Programmable frequency clock
for the buzzer.
104
DRAM Column Address
Strobe — Column address
strobe for DRAM banks refresh.
CCLK
39
CPU Double Clock — Feeds
CPU'S OSCIN. Asynchronous.
103
Continuous Walt — Low
extends the memory cycle of
the CPU.
28
General purpose output pin.
26
DMA Acknowledge — Output
tor DMA channel 3
acknowledge or general
purpose output pin.
FOSCO
37
High-Speed Oscillator Out —
Asynchronous. This line is used
as the return path for the
crystal (if used).
HOLD
115
Hold Request — When low,
HOLD requests the bus from
the CPU to perform DMA
operations or to insert idle bus
cycles.
Signal Pin Numbers Description
INTR 44 Interrupt Request — Low
indicates that an interrupt
request is being output to the
CPU.
MA1 — 15 101100 99 | Memory Address Bus —
98 97 95 | Multiplexed DRAM address.
94 93 92
91 89 88
87 86 85 |
MWSK 24 General purpose output pin.
OE 111 Output Enable — Used by the
addressed device to gate the
data onto the data bus.
PDO 16 Not used.
PEXT 65 Not used.
РМРНО ~ 3 74 73 72 | Output port.
71
RASO 106 DRAM Row Address Strobes
— Row address strobe for
| DRAM banks 0 and 1.
RAS1 105 RAS1 is not used.
SCLK1 22 General purpose output pin.
SCLK2/DAMKO | 29 | Scanner Clock 2 — Output,
DMA Acknowledge-output for
DMA channel 0 acknowledge.
SCVO 79 Scanner Compensated Video
Out — Analog current for use
by ABC or optional video
enhanement circuit.
SDFDBK 18 Sigma-Delta Feedback —
Feedback input to the SDC
analog receiver. Asynchronous
output signal.
SDIS/DMAK2 27 General purpose output pin.
SDOUT 20 Sigma-Delta Data Out —
Input to the SDC analog
transmitter.
SELO 108 Zone Select — Used to
SEL 110 adderss the device according
SEG 107 to the selected zone.
SLS 21 General purpose output pin.
SMPHO - 3 70 69 68 | Output port.
67
SOSCO 63 Low-Speed Oscillator Out —
Asynchronous. This line is
used as the return path for the
crystal (if used).
SPDW 23 General purpose output pin.
STBO-3 35 34 31 | General purpose output pin.
- 30
WDT 60 WATCHDOG Trap — Traps
CPU execution when
WATCHDOG detects error.
WEO 113 Write Enable — Used by the
WET 112 addressed device to gata the
data from the data bus WE0
for even and WE1 for odd
bytes.
Input/Output Signals
Signal Pin Numbers Description
А16 - 23 7 8 9 | High Order Address Bus —
10 12 13 | The most significant eight bits
14 15 of the CPU address bus.
ADO - 15 120 121 122 | Address/Data bus —
123 124 126 | Multiplexed address/data
127 128 129 | information.
130 132 1
2 3 4
6
ADS 118 Address Strobe — Controls
memory access, and signals
the beginning of a bus cycle.
DDIN 119 Data Direction In — Indicates
the direction of data transfer
during a bus cycle.
MWSO 47 General purpose I/O pin.
PCLK/DMRQ1 49 General purpose VO pin.
PIO0-1 54 53 General Purpose I/O Pins.
SBYPS/DMRQ2 | 48 General purpose VO pin.
SNH/DMRQ0 52 Sample and Hold — Output to
scanner sample and hoid
circuit or DMA Request-input
for DMA channel 0 reques.
UREN 45 General purpose (O pin.
UTXD 46 UART Transmit — Output.
(2) NS32FX164 (U19)
68-Pin PCC Package
9 -ao = | 5 се = © = @
ЗБЕВЕЕ e Re S 838582
LR LIZA LLENA
ya 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
sT2— 9 27 |-- А18
sT3—{8 28 |-- А17
PFS 7 29 |— A16
DDIN À 6 30 + VCC
ADS 45 31 + AD15
SPC 4 32 |-- AD14
vee — 3 83 |-- AD13
НВЕ - 2 NS32FX164 34 -- AD12
HOLDA À 1 NS32FV16 35 |— AD11
HOLD À 68 NS32FX161 36 | AD10
RSTO — 67 37 |-- ADS
RES — 66 38 [= ADS
RES À 65 39 E- GND
CWAIT À 64 40 AD7
GND À 63 41 [= ADS
OSCIN À 62 42 - AD5
RSTI À 61 43 }— AD4
60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44
TTT TI TTI]
EEE
B O O
o
Supplles
Vee Power
+5 V positive supply.
GND Ground.
Ground reference for both on-chip logic and output
drivers.
FO-2850
Input Signals
RSTI Reset Input.
Schmitt triggered, asynchronous signal used to
—
z
=
CWAIT
OSCIN
generate a CPU reset.
Note: The reset signal is a true asynchronous input.
Therefore, no extemal synchronizing circuit is
needed. |
Hold Request.
When active, causes the CPU to release the bus for
DMA or multiprocessing purposes.
Note: If the HOLD signal is generated asynchronously,
its set up and hold times may be violated. In this
case, it is recommended to synchronize it with
CTTL to minimize the possibility of metastable
states.The CPU provides only one synchroniza-
tion stage to minimize the HLDA latency. This is
to avoid speed degradations in cases of heavy
HOLD activity (i.e., DMA controller cycles inter-
leaved with CPU cycles).
Interrupt.
A low level on this pin requests a maskable interrupt.
INT must be kept asserted until the interrupt is acknow-
ledged.
Non-Maskable Interrupt.
A High-to-Low transition on this signal requests a non-
maskable interrupt.
Note: INT and NMI are true asynchronous inputs.
Therefore, no external synchronizing circuit is
needed.
Continuous Walt.
Causes the CPU to insert continuous wait states if
sampled low at the end of T2 and each following T-
State.
Crystal/External Clock Input.
input from a crystal or an external clock source.
Output Signals
А16 - A23
0
VU
с
D
о
o]
O
* High-Order Address Bits.
These are the most significant 8 bits of the memory
address bus.
* High Byte Enable.
Status signal used to enable data transfers on the most
significant byte of the data bus.
Status.
Not used.
User/Supervisor.
Not used.
interlocked Operation.
Not used.
Hold Acknowledge.
Activated by the CPU in response to the HOLD input to
indicate CPU has released the bus.
Program Flow Status.
A pulse on this signal indicates the beginning of execu-
tion of instruction.
BPU Cycle.
Not used.
Reset Output.
This signal becomes active when RSTI is low, initiating
a system reset.
FO-2850
|
O
m
m
OSCOUT
=
Un
CTTL1 —2
FCLK
ALE
IOUT
Read Strobe.
Activated during CPU or DMA read cycles to enable
reading of data from memory or peripherals.
Write Strobe.
Activated during CPU or DMA write cycles to enable
writing of data to memory or peripherals.
Timing State Output.
Not used.
Data Buffers Enable.
Used to control external data buffers. It is active when
the data buffers are to be enabled.
Crystal Output.
Not used.
SPecial Cycle Address Strobe.
Not used.
System Clock.
Output clock for bus timing. CTTL1 and CTTL2 must be
externally connected together.
Fast Ciock.
Not used.
Address Latch Enable.
Active high signal that can be used to control external
address latches.
Interrupt Output
Not used.
Input-Output Signals
ADO — 15
wn
y
O
о
o
Zz
>
O
о
* Address/Data Bus.
Multiplexed Address/Data Information. Bit O is the least
significant bit of each.
Slave Processor Control.
Not used.
* Data Direction.
Status signal indicating the direction of the data transfer
during a bus cycle. During HOLD acknowledge this sig-
nal becomes na input and determines the activation of
RD or WR.
* Address Strobe
Controls address latches; signals the beginning of a bus
cycle. During HOLD acknowledge this signal becomes
an input and the CPU monitors it to detect the beginning
of a DMA cycle and generate the relevant strobe sig-
nals. When a DMA is used, ADS should be pulled up to
Vcc through a 10 kQ resistor.
(3) U12 Pin Layout
2 2 ad LT от =! с 5
SRZEXSQIESOS5SL RE
EPSLRCZELZPIZ=AZÓNOS
НОО
DGND 1 RESET
PDS/SDE C7 —1 TRIG
PD4/PP4 [7] 1 ICLK
РОЗ/РРЗ Ц 1 Cs
PD2/PP2 1 - AS
PDIPPI CY —] Ao
PDO/PPO 1 {3 A11
DVDD CA 1 CLKIN
DACK/PP5 1] 1 DVDD
DREQ/PP6 —] A12
MTP/PP7 7] — RD
CLK2 CN —] WA
CLK1 CO Г} AO
RS ГА
SH [] [3 A2
DEND — Y J] DGND
JUCUU OUT UOUUO UE
6682885828 227529 239
5 >
a a
Type
| ¡INPUT B |BIDIRECTION | NC NOT CONNECT
O |OUTPUT P |POWER
No. Pin name 10 Function
1 {D7 B | CPU interface data bus pin
2 | D6 В | D7 is the MSB pin and DO is the LSB
3 | D5 B | P™
4 | Da B
5 | D3 B
6 | D2 B
7 | Di B
8 DO B
9 | DGND P | Digital grounding pin
10 | DVDD P | Digital power supply pin
11 | A8 | | CPU interface address bus pin
42 | A7 | | A12 is the MSB pin and AO is the
13 Г Аб | LSB pin.
14 | A5 |
15 | A4 |
16 | АЗ |
17 | DGND P | Digital grounding pin
18 | A2 | | CPU interface address bus pin
19 | А? |
20 | AO |
21 | WR | | CPU interface write signal pin
22 | RD | | CPU interface read signal pin
23 | A12 I | CPU interface address bus pin
24 | DVDD P | Digital power supply pin
25 | CLKIN | | System clock input pin
26 | A11 ! | CPU interface address bus pin
27 | A10 |
28 | A9 |
29 | CS | | CPU interface chip select signal pin
30 | ICLK | | Not used.
No. Pin name 1/0 Function
31 | TRIG | | External trigger signal input pin
32 | RESET | | System reset pin
33 | SAMP/LININT | O | Notused.
34 | TEST | | Test pin (normal digital grounding)
35 | REF | | Not used.
36 | AGND P | Analog grounding pin
37 | DALRL | | D/A converter low reference pin for
A/D converter low reference
38 | DAHRL | | D/A converter low reference pin for
A/D converter high reference
39 | AIN | | Sensor signal input pin
40 | TEMP || Not used.
41 | ATAPH O | Analog intermediate pin for A/D
converter high reference
42 | DAHRH | | D/A converter high reference pin for
A/D converter high reference
43 | AVDD P | Analog power supply pin
44 | DALRH | | D/A converter high reference pin for
A/D converter low reference
45 | ATAPL O | Not used.
46 | AGND P | Analog grounding pin
47 | PD7/SD O | DMA output/serial data output pin
48 | PD6/SDCK O | DMA output/serial data transmission
clock pin
49 | DGND P | Digital grounding pin
50 | PD5/SDE | O | DMA output
51 | PD4/PP4 B | DMA output
52 | PD3/PP3 B
53 | PD2/PP2 B
54 | PD1/PP1 B
55 | PDO/PPO B
56 | DVDD P | Digital power supply pin
57 | DACK/PP5 В | DMA data acknowledge signal input
pin
58 | DREQ/PP6 B | DMA data request signal output pin
59 | MTP/PP7 B | Not used.
60 | CLK2 O | Not used.
61 | CLK1 O | Sensor drive signal output pin
62 | RS O | Not used.
63 | SH O | Not used.
64 | DGND P | Digital grounding pin
КО-2850
(4) U13 Pin Layout
[Input pin
O: Output pin
В: Bidirectional pin
P: Power pin
NC: Not connected
No. Pin name Type No. Pin name Type
1 CS | 41 AEN O
2 RD | 42 AST e
3 WR 43 MDEN O
4 A2 | 44 MRD O
5 A1 | 45 MWR O
6 AO | 46 10RD 0
7 VDD Р 47 IOWR O
8 NC 48 LDE 0
9 D7 B 49 UDE O
10 De _ B 50 READY |
11 D5 B 51 DTC O
12 D4 B 52 VSS Р
13 VSS P 53 NC
14 D3 B 54 MA23 О
15 D2 B 55 MA22 O
16 D1 B 56 MA21 O
17 DO B 57 MA20 O
18 NC 58 MA19 O
19 NC 59 MA18 O
20 IREQ O 60 MA17 O
21 DREQ О 61 MA16 O
22 DACK | 62 MA/MD15 O
23 NC 63 VSS Р
24 NC 64 MA/MD14 B
25 NC 65 MA/MD13 B
26 NC 66 MA/MD12 B
27 RESET | 67 MA/MD11 B
28 CLK | 68 MA/MD10 B
29 VSS Р 69 MA/MD9 B
30 TEST4 | 70 MA/MD8 B
31 VDD P 71 MA/MD7 B
32 TEST3 | 72 VSS P
33 TEST2 | 73 vDD Р
34 TEST1 | 74 MA/MD6 B
35 TESTO | 75 MA/MD5 B
36 NC 76 MA/MD4 B
37 BREQ O 77 MA/MD3 B
38 BACK | 78 MA/MD2 B
39 IDREQ | 79 MA/MD1 B
40 IDACK O 80 MA/MDO B
FO-2850
(5) CPU interface
Terminal Pin 1/0 Function
| name No.
CS 1 || Chip select for the CPU to access
the LC8213 (low sctive).
RD 2 | Read.Set to "L" when the CPU is
the read out the LC8213 register.
WR 3 | Write.Set to "L" when the CPU is to
the LC8213 register.
A2 4 | Address input for when the CPU
A1 5 accesses LC8213.
АО 6
D7 9 VO | Bidirectional 8-bit data bus
D6 10 3 state
D5 11
D4 12
D3 14
D2 15
D1 16
DO 17
IREQ 20 O | Interrupt request signal for the
CPU. By reading out the INTR
(interrupt request register) the CPU
can find the cause of the
interruption.IREQ is set to "L" when
the CPU reads INTR.
DREQ 21 O DMA request signal for the external
DMA controller. This will be set to
"Н" п Ме following cases.
* Data exists in the EFIFO during
the coding processes.
* An empty space exists in the
DFIFO during decoding
processes.
* The DBUF can read/write during
data transfer between the image
memory bus and CPU bus.
DACK 22 | | DMA acknowledge signal from the
external DMA comtrolier.If DACK is
set to "L" during coding or
decoding, EFIFO and DFIFQ will
be accessed. DBUF will be
accessed if DACK is set to "L"
during data transfer between the
image memory bus and CPU bus.
(6) Image memory interface
Terminal on VO Function
| MA23 54 O |Notused.
MA29 55 3 state
MA21 56
MA20 57
MA19 56
MA18 59
MA17 60
MA16 61
MA/MD15 62 I/O | Not used.
MA/MD14 64 3 state | Low-order 16-bit address and
MA/MD13 65 16-bit data bus for the image
MA/MD12 66 memory.
MA/MD11 67
MA/MD10 68
MA/MD9 69
Terminal | on VO Function
MA/MD8 | 70 PTT
MA/MD7 71
MA/MD6 74
MA/MD5 75
MA/MD4 76
MA/MD3 77
MA/MD2 78
MA/MD1 79
MA/MDO 80
AEN 41 O | This is setto "L" when the LC8213 |
is the bus master to the image
memory.
If AEN =H", MA/MD, MAD, МУУА,
10RD, IOWR, UDE and LDE will be
a HiIZ output.
AST 42 О [This signal indicates that an
address is being output to
MA/MD15 ~ MA/MDO.
MDEN 43 O | This signal indicates that the
L C8213 is using MA/MD15 ~ MDG
as data buses.
USE 49 МО | Not used.
3 state
LDE 48 I/O | This signal indicates that the
3 state | low-order bits of the data bus are
| being used.
MRD 44 O | This is set to "L" when data is
3 state | being read out of the image
memory.
MWR 45 O | This is set to "L" when data is
3 state | being written into the image
memory.
IORD 46 O | Notused.
3 state
IOWR 47 O |Notused.
3 state
BREQ 37 O | This signal is used for the LC8213
to request usage rights from the
image memory bus.
BACK 38 | Input signal allowing the LC8213 to
use the image memory bus.
IDREQ 39 | Not used.
IDACK 40 O | Not used.
READY 50 | This signal is used to delay the
resd/write signal when using low
speed image memory or an VO
device.
DTC 51 O Not used.
(7) Others
Terminal Pin No. МО Function
CKL 28 | External clock (Max.20NHz)
— RESET 27 | Reset
TESTO 35 For testing.This is normally fixed
TEST! 34 to "L".
TEST2 33
TEST3 32
TEST4 30
VDD 7,31, power supply (+ 5V)
73
13, 29, GND
VSS 52, 63,
72
(8) U29 Pin Loyout
Pin# Signal Description
1:18 | IA14:1A0 Image bus address
19 | AI_LINEINT Scanner line interuppt to
FX200 INT1 pin
20 | CEP_*LED Chip select to image
mememory
21 | AL TRIG Tigger signal to LC82103
22 | Al_XIPDACK DMA ack. sugnal to LC82103
23 | IM_%WR Write strobe to image
memory
24 | Al_CEP*DREQ DMA request to FX200
25 | Al BACK Bus ack.signal to LC8213
28 | IP_CLK1 CLK1 of the LC82103
32 | А_ЖСЕРОМАК DMA ack.signal from FX200
33 | IM_IPDREQ DMA request from LC82103
34: 42 | IDATA7: IDATAO Image bus data
44 | IM_IPSH SH signal from LC82103
45 | IM_BREQ Bus request from LC8213
46 | CEP_DREQ DMA request from LC8213
47 | СЕР_ЖАЕМ Address enable signal from
LC8213
48 | CEP_AST Address strobe signal from
LC8213 |
49 | RESET Reset signal from LBP engine
51 | VCKL Not used
53) *DREADY DREADY signal from LBP
54 | ERROR ERROR signal from LBP
55 | KDCRDY DCRDY signal from LBP
56 *HSYNC Horizontal syc.signal from
LBP |
57 | *SCLK SCLK signal from LBP
58 | VSYNC Vertical signal from LBP
59 | PLL-CLK Basic clock from PLL
62 | kDDATA Video data to LBP
63 | *DSRDY DSADY signal from LBP
64 | KSDATA SDATA for LBP
65 | RES-*ERR RESERR to LBP
66 | ЖОРАСЕ DPAGE to LBP
67 | *DPRIM DPRIM to LBP
69 | AL-X*xMWE Write storobe to 16MDRAM
70 | Al-KkICAS L-CAS signal to 16MDRAM
71 | AI-XUCAS U-CAS signal to 16MDRAM
73 | *ICAS CAS signal from FX200
74 | *IWEI Write enable signal for even
byte on data bus
75 | *IWEO Write enable signal for odd
byte on data bus
76 | FX1_%RSTO Reset signal from FX164
77 | Al_*IRD read strobe to I/O device
78 | Al_*IWR write strobe to 1/0 device
80 | AL *SANWRL Strobe signal for LDO:8 bus
81:89 | LDO:LD7 Buffered AD bus for slow
devices access
90 | Al_*CSIP Chip select signal for
LC82103
91 | Al_%CSCEP Chip select signal for LC8213
92 | Al_*RDKRB Read strobe signal for
7415244
FO-2850
Pin# Signal Description
93 | Al_*WRFCR Write strobe signal for
74LS273
94 | Al_*CSCONF Chip select signal for
64KSRAM
95 | AL *XWRLED Not used
98 | F2_*SEL1 Zone select signal from
FX200,
99 | F2_*SEL3 Zone select signal from
FX200
100! F2_*DMAKO DMA ask.signal from FX200
101 | Р1_ЖОВЕ Data buffer enble signal from
FX164
102 | F1_>*DDIN Status signal indicating the
direction of the data bus from
FX164
103 | F1_* RD Read strobe signal from
FX164
104 | F1_*WR Write strobe signal from
- FX164
108 | F1_CTTL1 System clock from FX164
110 | F1_%HLDA Hold Ask. signal from FX164
111 | F1_ALE _| Address latch signal from
FX164
112:129 | AD15:ADO FX164 AD bus
132 | *XINT 1284 INT signal
133 | XSELECT 1284 SELECT signal
134 | XPERR 1284 PERR signal
135 | XBUSY 1284 Busy signal
136 | XACK 1284 ACK signal
137 | XFAULT 1284 FAUL signal
138:146 | BPCDATA1:BPCDATAS | 1284 buffered data
148 | *XSTROBE 1284 STROBE signal
149 | *XSLECTION 1284 SELECT IN signal
150 | *XAUTOFD 1284 AUTOFD signal
151 | Al _1284IN 1284 buffer direction control
signal
152 | AL_ECPINT 1284 interrupt signal to
FX200
153 | AI_*DREQ
157:174 | AL FIFODO: AL FIFOD15 | WIPS FIFO Data
175 | AL FIFOEWR WPS FIFO write strobe
177 | Al_FIFOXCAS WPS FIFO CAS signal
178 | AI_FIFO%RAS WPS FIFO RAS signal
179:188 | AI_FIFOAC:AI_FIFOA8 | WPS FIFO address signal
190:193 | AI_SMPHO0:AI_SMPH3 | Scanner motor phose signal
194:195 | AI_CURO:AL_CUR1 Scanner motor current
contro! signal
197 | AL_>*CLK2 CLK2 signal for CCD
198 | Al_*CLK1 CLK1 signal for CCD
199 | AL_*XCLAMP CLAMP signal for CCD
202 | AI_*LAMPON Scanner lamp control signal
203 | AI_*eTGCCD TG signal for CCD
204 | Al XRSCCD RS signal for CCD
205 | PNL_*SCOVER Scanner cover open signal
206 | *B4SEN B4 sensor signal (Not used in
not-Japan model)
207 | *PISEN Paper in Sensor on Scanner
signal
208 | XORSEN Original sensor on scanner
signal
FO-2850
3. Main PWB circuit description
(1) Summary
The block diagram of the main PWB is shown below. The main
control PWB performs the following operations:
* Interface with the host PC,
* Laser printer engine control
* CCD, LED light source control
* ADF control
* Interface with public telephone line
* Panel interface
The 5IN1 functions are realized by combination of these operations.
NS FX164 is used as the CPU, and FX200 is used as the system
controller. An 8M EPROM is used as the program ROM, and16M
DRAM as the main memory. TO store the registered telephone num-
bers, etc., 64K SRAM (backed up by battery) and the clock IC are
used.
LC82103 is used to process data scanned with CCD, and LC8213 is
used to process data compression and expansion.
ASIC performs laser printer control, scanner control, and interface
with the host. The NCU circuit connects with the telephone line.
(2) CPU section
The NS32FX164 (having 32bit core and 16bit DSP core) is used as
the CPU in combination with the system controller NS32FX200. The
32bit CPU core is used to control the system. By combination with the
16bit DSP core and the Sigma Delta Coded circuit in the NS32FX200,
the MODEM function is realized. The NS32FX200 is provided with the
DRAM controller function, the interrupt controller function, the timer
function, and the DMA controller function, which are used to control
the system.
CPU NS32FX164 System controller NS32FX200
(DRAM controller ON
32bit CPU CORE erp! controiler
16011 DSF module DMA controller
Sigma Delta Coded i
В Analog | NCU — Public line
circuit circuit
(3) Memory
A DRAM of 16M and 1M x 16 bit composition is used as the main
memory. An 8M EPROM of 512K x 16bit composition is used as the
program memory.
The NUM6355 is used as the clock IC, and 64K SRAM of 8K x 8bit is
used as the configuration memory which stores various settings.
These two IC's are backed up by a 3V lithium battery even when the
AC power is turned off. The configuration memory is also used as the
buffer memory in PC-FAX.
(4) Image process
The image signal from CCD is amplified and inputted to the main
control PWB. This analog signal is then converted into digital signal
by LC82193 and subject to various image processes, and inputted to
the image bus.
Distortion [_) Multi-value Binary Qutput | |
correction | resatution reduction control | |Digital
process data
conversion
Binary
coding
> Filter
Analog
signal
conversion
Bbit
Gamma
correction
AN
Error
ditfusion
SAAM
2Kbit
Area
Г DRAM ;
separation
trol
SONO" | | geKbit
signal i
image process
ANYO LC82103
The LC82103 is the image process IC having the following functions:
[8bit A/D conversion]
[Distortion correction of waveforms based on the data stored in the
internal DRAM]
White correction data are stored in the internal DRAM when the
LED light source is lighted, and black correction data are stored in
the internal DRAM when the light source is turned off.
When scanning, the black and white correction data are used to
perform distortion correction.
[Resolution conversion in the multi bit level (x2, x2/3, x 1/2)]
In FAX, images of 200dpi should be sent. The images scanned
from CCD of the basic resolution 300dpi are reduced by this func-
tion. In single copy, this function is utilized to convert the image
into that of 600dpi and to send the image to the printer engine.
+
[Gamma correction]
By using the internal SRAM of 2Kbit, gamma correction can be
made to the scanned images.
[Various filter processes (edge emphasis, etc.)]
[Error diffusion (area separation allowed), simple binary coding]
Multi-bit data are converted into binary data at the specified
threshold level.
In the photo mode, the area separation function is used together
to convert the data into binary data in the error diffusion mode.
[Binary image reduction process]
Multi bit and binary output mode selection
This image process IC allows selection of the two modes; the
multi bit (8 bit), and the binary (1bit).
Normally the binary data are outputted. In the gray scale mode of
PC scan, multi bit data are outputted.
(5) Compression, expansion
By combination of LC8213 and 256K SRAM, compression and ex-
pansion are performed.
CPU Compression
Bus CPU Image Bus Image Bus
interface interface
Expansion 256K
> LC8213 SRAM
This IC converts bit map data into coded data in MH, MR, or MMR
format or converts coded data of MH, MR, or MMR format into bit
map data. In FAX sending or multi copy, bit map data outputted from
LC82103 to the image bus are coded in MMR format and outputted to
the CPU bus. The coded data are stored in the main memory. In FAX
reception, the coded data are read from the main memory and con-
verted into bit map data by this IC and outputted to the image bus.
The outputted data are sent through the ASIC to the laser printer
engine and printed. The 256K SRAM connected to the image bus are
used as the buffer memory.
FO-2850
MA signals are formed.
1284 block
(6) ASIC section
This ASIC of about 30,000 gates is composed of the three blocks.
e SCL block: Scanner control and bus control
® 1284 block: Interface section with PC
* LBP: Laser printer engine control and FIFO memory control o MACHINE
RESET_GEN forms reset signals in ASIC, and CLOCK GEN forms ECP/PEPPY
clock signals in ASIC. HFKDIV divides the basic video frequency STATEMACHINE
inputted to the ASIC. EEE
DIGITAL| INTERFACE
ASIC MUX FILTER [€ +
NIBBLE
Reset_gen Clock gen *—STATEMACHINE
QVER- WPS-BUS
RIDE |
|
|
REGISTER |
BLOCK |
|
SCL block FX-BUS | EXT.WPS-BUS
e| E Interface with PC is based on the IEEE1284 (bi-directional parailel
o ol 8 _______ , interface) and supports ECP, Peppy, and Nibble modes.
>< | , ,
+ It is composed of the ECP/Peppy state machine and the Nibble state
| — Control —— machine to support these modes, and the negotiation state machine
ala in . .
| Sess Bus control EN to determine the mode, and the register block for ECP/Peppy mode.
Motor control
Motor control Controls LBP block
FX x |
| data 1 !
| out 5 i
Lamp on FX si 2 | SEL
; Lamp modulation _ дата п | 8 3 CES | ELDATAJ[5:0]
- > — -
x | ST S EL DATA[7:0]
i — | ROYLED
se ! —3 DMA control LBP READY ELWR_
anner sensors Sensors — 1ВР ELRD_
_1 9 Ze x | DACK/wine y UE ECP
El 518 z La CS_LBP LBP module PAPPY _ | module
| a ata tp :
| 7 8 8 < |cAPTURE] ; CA5:0] _ PARERR
В 21265 | DATA2FPGA[15:0] LEDATAJ?:
' a 3 Е 2 ° À WA LERDY
= ol & CEE = STALL
CCd timing = È “LÉ| ES ES SCL IRD_
corre + - | D_LBP2SCLH15:07 > - В
| Image bus 1 Module Pa : DPRIM m
¿e orp 2 Timing control Bie control | LBP_WE_ 3
ECP Dreq out 2 A 2 IMG2LBP{7:0] VSYNC
+ E
| 4 4 | 3 212] 2 | LBP_ADY DREADY
Lone El 21-3151.5 J ERROR —]LEP
21) fa | 8 £ SIE
Sl x of | SEIS | ТЕ) 5 “БРАТА — | |ЕМСМЕ
El Ela Sly Siete elle] prio:
Si 512] =| 5) & 8 8 Zl 31s] @ DSADY
= o a 51010 = = e E
EY 5lgl 8 8 vw v “т ЕЁ + PLL DCRDY
© q SCLK
y © БРАТА
г.
The SCL biock performs scanner control, timing control, and bus o a > =
. . г =
control. In the scanner control block, inputs of the scanner motor in | ^ 150 WR DRAM E
the ADF, the LED light source, and the ADF sensor are made. In the oy OE 206K i
. . . HFKDIV ADDR8:0] x16
motor control block, the driver signal is outputted according to the Н5_ DATA[5:0]
command from CPU. The lamp modulation block outputs the drive
signal of the LED light source. The sensor block receives input of the 1
sensor/switch state on the ADF. The bus control block performs the
CPU bus control, image bus control, and DMA transmission between
them. The timing control block forms CCD clock signals and converts
digital signals into analog signals and outputs to the matching trans-
former.
The LBP block controls the laser printer engine and the FIFO
memory. Since sending/receiving of command/status with the LBP
engine is made in the serial line, serial/parallel conversion is made in
this block to make interface between the CPU and the LBP engine.
The reference video signal generated in the PLL circuit is made to the
video frequency necessary for the dividing circuit. Video data are sent
to the laser engine in synchronization with this signal.
A 4M DRAM of 256K x 16bit is used as the printer FIFO memory,
which is used as the buffer memory in PC-scan.
FO-2850
(7) NCU circuit
The NCU circuit has the following functions:
* Matching between the public line and Sigma Delta circuit (MODEM
circuit)
® To make OFF-hook state
* Ring detection
* External telephone connection
* Detection of OFF-hook state of the external telephone
Rubiic No Matching Sigma Delta
fine o transformer circuit
K2 T1
Ring NCU_RDT
detection To CPU
U14
|| AN DC Load
| Ki BR1/Q22/Q5
AW — |
Loop NCU_LPCDT
K3 R214 current ¡———————— To CPU
detection
External
telephone U14
Relay K2 connects the public line and the matching transformer.
Relay K1 connects the DC load line and the public line.
Relay K3 connect the external telephone line and the public line. For
calling sound from the public line, the signal is rectified and inputted
to the photo coupler PC824 (U14) to generate NCU_RDT signal.
The CPU judges whether calling is made from the public line or not
referring to the frequency of the NCU_RDT signal.
By turning on relay K1, the DC load circuit is connected to the public
line, and the loop of the public line is closed. Then response of MFP
is transmitted to the public line. (OFF-hook state). When the dial
pulse is selected, relay K1 is turned on/off according to the telephone
number to transmit the remote telephone number to the public line. in
the tone pulse, the tone signal from the Sigma Delta circuit is passed
through the matching transformer to the public line.
The NCU_LPCDT signal is generated according to the potential
generated in R214. When the external telephone is in OFF-hook
state, a potential difference is generated in R214 to drive the
MCU_LPCDT signal LOW. The CPU monitors this signal and judged
whether the external telephone is busy or not.
(8) Sigma Delta circuit
The Sigma Delta circuit converts analog signals passed through the
matching transformer into digital signals. The digital signals
(FX200_SDOUT) outputted from FX200 are inputted to the analog
switch to generate digital switch for switching with +5V/5V. The sig-
nals are converted into analog signals in the LPF circuit.
HC4053(437)
Integrator, Comparator
FX200_S5DIN [mar] [7]
On the other hand, the analog signals inputted through the matching
transformer are amplified in the AMP circuit. By combination with
FX_200SDBFK signal and the integrator/comparator, the
FX_200SDIN signal is made and inputted to FX200.
(9) Data flow
The data flow in each reception mode is shown below.
(FAX reception) Reception operation
| Prog. ROM | | Panel
L |
CPU Bus
| FX164 |
| LC8213
us
Image
LC82103 Г
image.
Memory
4 Compressed
| ' Image
Dre
CCD
#
Scan
Motor
—
The FAX data from the public line are stored in the 16M DRAM. In
this case, the data are stored in the received format, that is in MH,
MR or MMR format. When reception of one page data is completed,
printing is performed.
(FAX reception) Print operation
Compressed
P1284
CPU Bus
| 1 C8213 |
i 5
D
©
[1]
Image Bus ;
CCD LC82103 ASIC LBP engine
Buf. Mem.
Image. ов em |
Memory “
Scan
Motor
The FAX data stored in the main memory are transmitted to LC8213,
where they are converted into bit map data, which are sent to ASIC
and transmitted to the LBP engine for printing. |
(FAX transmission)
NCU
FX164 FX200 Main Memory
| Compressed
CPU Bus
| LC8213
В 2
20
wo
[i]
P1284
CCD LC82103 . ASIC LBP engine
image
Memory
Scan
Motor
The CCD control signal is generated in LC82103. Image signals are
read from the CCD. A/D conversion is made by LC82103. Since the
CCD of 300DPI is used, data are compressed to 2/3 in LC82103 to
obtain image data of 200DPI. The converted image data of 200DPI
are transmitted to LC8213 and converted into MMR format. The con-
verted data are stored in the main memory then read by FX200 and
transmitted to the public line.
(WPS print}
| Fx164 | | Fxeo0 |
| ProgRoM | | Panel |
Compressed
CPU Bus
ASIC
| LC8213 |
image
P1284
mage Bus
LCB82103
L
LBP engine
о
Ss
=
©
Image.
Memory
Scan
Motor
LI
(Single copy)
SE
FO-2850
| Prog ROM | | Panel | [| Fx164 | | Fxeoo |
| |
Compressed
CPU Bus
image
1 C8213 ASIC
image Bus
CCD 1С82103
Г
LBP engine
= 1 Buf. Mem.
jit
Image.
Memory
Scan
Motor
In WPS print, data sent from the host PC are transmitted to ASIC and
processed in ASIC to be transmitted to the LBP engine. At that time,
the CPU does not relate to data process directly.
In single copy, image data read from the CCD are sent directly to the
LBP engine. The image data read from the CCD are A/D converted
by LC82103 and sent to ASIC, then to the LBP engine. Data are not
stored in the main memory midway.
(Multi, sort copy) Scanning
(PC scan)
NCU PSTN
[reno] [ra] [xt] [peso | E.
Compressed | Prog.ROM | | Panel | | Fxie4 | | Fxoo | Main Memory
ima
CPU Bus 9” | A Compressed
ima
LC8213 | P1284 CPU Bus ge
Bit Map LC8213 ASIC P1284
Image Bus | ASIC LBP engine
CCD fm 1082103 Image Bus
—
Image. Bit Map
E ue
Scan
» 64K |
E | Scan a
Motor
The CCD control signal is generated in LC82103. The image signal is
read from CCD. A/D conversion is made by LC82103. The converted
image data are transmitted to LC8213, where they are converted into
MMR format and stored in the main memory.
The scanned image data are A/D converted by LC82103 and stored
to the buffer memory through ASIC. The data in the buffer memory
are transmitted through ASIC to the host PC.
(Multi, sort copy) Printing
| ProgROM | | Pane | [| Fx164 | | Рхгоо |
| Compressed
(PC FAX)
NCU
| Prog.ROM | | Panel | | FX164 | | FX200 Main Memory
| [ ET
CPU Bus
CPU Bus image
| LC8213 | ASIC | P1284 |
Image B Bit Map | Lcea1s
ce LBP engine
LC82103
Image Bus
Image.
Memory
ASIC
LC82103
С LBP engine
Buf. Mem. сер
ИЦ
Scan
Motor
The FAX data stored in the main memory are transmitted to
LC8213,where they are converted into bit map data, which are sent to
ASIC and transmitted to LBP engine for printing.
Scan
Motor
The FAX data sent from the host PC are received by ASIC through
P1284 port and stored in the main memory. The CPU read the data
from the main memory and sent to the public line through the NCU
circuit.
FO-2850
4. DC power operational description
(1) General
When the specified AC input is applied to this power, two DC voltages
of +13V, +5V, +12V, —12V are provided.
The DC power employs the pseudo-resonance self-excitement
flyback convertor system with the hybrid IC STR-F6514 (100V
series).
Fig. 1 shows the block diagram of the power section.
Connector AC filter Rectifying/
CN1 Li smoothing
Main switch
control
IC1
Rectifying | |Rectifying
/smoothing| |/smoothing
10201 |
IC105
{C102
+5V | +13V
-12VA
+12VA
(2) AC input section (filter, etc.)
The input filter is of LC filter in one-step composition, and reduces
common mode noises and normal mode noises from the AC line. The
across-the-line capacitor, the line bypass capacitor, and the common
mode choke coil are provided on the AC PWB. the line bypass
capacitors (C9, C10) and across-the-line capacitor C8, C11 are
provided on the power PWB.
The fuse (F3) in the AC line protects the circuit against an abnormal
current caused by blow-off or melt-down in the circuit.
(3) Rectifying and smoothing
This section converts the AC power into DC outputs (instable state).
Rectifying and smoothing are made by diode bridge D7, power ther-
mistor resistor R1, and smoothing capacitor C1.
Power thermistor resistor R1 limits a rush current caused by charging
of smoothing capacitor C1 when the AC power is turned on.
(4) Main switching circuit section
The instable DC output is turned ON/OFF by the FET transistor in the
hybrid IC (IC1) with the transformer T1 as the load. During the ON
period of the FET transistor, energy is charged in transformer T1.
During OFF period of the FET transistor, energy is discharged to the
secondary side of transistor T1.
C4 is a resonance capacitor which makes LC resonance of the induc-
tance in the primary winding of transformer T1 and capacitor C4.
When the drain voltage of the FET transistor approaches near OV, the
FET transistor is turned on to reduce power loss.
To take timing to turn on the FET transistor, delay of time constant of
resistors R3 and R8 and capacitors C3 and C5 is used.
(5) Hybrid IC (IC1) pin functions
The figure below shows the block diagram of hybrid IC (IC1).
STR-F6514 block diagram
Pin functions
PIN} Code | Name Function
No.
OCP and Protection of an overcurrent and
1 ¡OCP/F.B. |
feedback pin |constant-voltage control signal input
2 5 Source pin ¡MOS FET source
3 D Drain pin ¡MOS FET drain
VIN pin Power voltage of the control circuit
4 VIN
grounding
5 GND |GND pin GND
Other functions
Code Function
OVP Built in the overvoltage protection circuit.
TSD Built in the overheating protection circuit.
1) VIN pin (No. 4 pin), start circuit
The start circuit detects the VIN pin voltage to start or stop the
operation of hybrid IC (IC1).
When the AC power is turned on, capacitor C2 is charged through
starting resistors R9 and R10. When the VIN pin voltage reaches
16V (TYP), the control circuit stops the operation.
After the control circuit is actuated, the voltage of auxiliary winding
of transformer T1 is rectified and smoothed to provide the power.
2
“чт”
OCP/FB pin (No. 1 pin), oscillator, constant-voltage contro! circuit
The oscillator utilizes charging and discharging of C1 built in the
hybrid IC (1C1) and capacitor C5, generating pulse signals to turn
ON/OFF the FET transistor. The constant-voltage control is per-
formed by determining the OFF time of the FET transistor by the
delay time determined by the time constant of resistors R3 and R8
and capacitors C3 and C5. The ON time control varies the pulse
width of the oscillator directly.
The OCP/FB pin voltage is biased by the current of photo coupler
PD1 so that the detected voltage of shunt regulator IC101 on the
secondary side of the power is constant. As a result, the ON time
of the FET transistor is controlled to stabilize the MAIN output
(+13V).
The voltage drop of R5 connected between the FET transistor
source pin (2 pin) and the GND pin (5 pin) to detect the drain
current of the FET transistor. The threshold voltage of overcurrent
detection is about 0.75V (TYP).
When the output voltage falls below the specified level under
overload state, the voltage in the additional winding of the primary
side also falls accordingly to fall the VIN pin voltage below the
operation start voltage. Therefore, the VIN pin voltage rises again
and starts operation at the operation start voltage, performing
intermittent operations.
3)
Overheat protection circuit
When the frame ternperature of hybrid IC (IC1) exceeds 150°C
(TYP), this circuit actuates the latch circuit.
When the latch circuit is actuated, the oscillation output is kept
LOW to stop the power circuit. At that time, the VIN pin voltage
rises and falls between 10V (TYP) and 16V (TYP).
Overvoltage protection circuit
When the VIN pin voltage exceeds 22.0V (TYP), this circuit ac-
tuates the latch circuit.
It basically functions to protect against an overvoltage of the VIN
pin in the control circuit. Since, however, the VIN pin voltage is
supplied from the transformer additional winding and it is propor-
tional to the output voltage, it operates also against an overcurrent
in the primary side when the control circuit is opened.
(6) Secondary side rectifying/smoothing output circuit
The output from the transformer (T1) is passed through the rectifying
diode and the smoothing diode to be outputted. The component parts
numbers of the VB (+13V) are rectifying diode D101, and smoothing
capacitors C102, C103, C104.
E
FO-2850
FO-2850
5. PCU description
(1) Block diagram
Laser scanning unit
Motor
driver
()— Driver
FAN
Heater lamp
DO Driver
control circuit
Thermistorn
Driver
High
voltage
generating
circuit
Driver
DL
Solenoid
Driver
PUS
CPU
(ONE CHIP)
TMS377C08
Laser start
| position
sensor
Laser diode
Scanning motor
O
WPS VF
controller :
Host
Reset circuit
PIN sensor
POUT sensor
PE sensor
Door switch
Room temperature
sensor
Top margin
adjustment volume
Small paper
switch
Toner sensor
The PCU controls the following functions and items:
1) Interface between the MAIN PWB and the PCU
2) Rotation of the main motor (pulse motor)
3) High voltage output
4) Fusing temperature
5) Optical system (polygon motor/laser APC circuit start)
6) Temperature correction of fusing temperature and high voltage
output
(2) CPU (TMS377C08)
The TMS377C08 is a C-MOS, one-chip microprocessor which is
provided with an 8KByte ROM and a 256Byte RAM. In addition, it
includes two 16Bit timers and eight 8Bit A/D convertors.
CPU signal description
e In/Out | Signal Name Function
1 MCA Main motor control signal
5 О MCA_ Main motor control signai (MCA
reverse signal)
3 O MCB Main motor control signal
4 О MCB_ Main motor controi signal (MCB
reverse signal)
5 O PMD_ Polygon motor drive signal (L:
Drive)
6 PMCLK Polygon motor clock
7 О APCSTT APC circuit (LSU) start signal (H:
Drive)
Reset signal to be inputted to the
81 | MRES_ | CPU (L: Reset)
9 | SYNC Laser scan horizontal sync signal
(NMI) (CPU interruption at the rising edge)
10 O LEND_ Line end signal (L: Drive)
Lead edge (paper feeding
11 © VSYNG direction) sync signal (H:drive)
12 O Not use
13 O Not used
14 | Not used (Pull up)
15 | Not used (Pull up)
16 | (VPRIM_) Not used (Pull up)
17 O PRSTT Print start signal (H: Drive)
Reset signal from the PCU to the
18 | © RESET. | Main control PWB (L: Reset)
Printer Ready signal to the ICU
19 O DREADY_ (L:READY)
20 — Vee Power source +5V
Serial communication request from
21 O DCRDY_ the PCU (H: Communication
request)
Engine error notifying signal to the
22 © ERROR ICU (H: Error occurrence)
Serial communication request
23 | DSRDY_ signal from the WPS controller (H:
Communication request)
Engine error cancel request signal
24 | RESERR from the ICU (H: Cancel request)
о | ОРАСЕ_ Print request signal from the ICU
(L: Print request)
96 О SCLK Sync clock for WPS Video I/F serial
communication
57 VO SDATA_ Serial data line for WPS Video I/F
serial communication
Communication port initialize
28 | DPRIM_ request signal from the ICU (L:
Initialize request)
29 — Vec Power source +5V
30 — VrefHIl Power source +5V
31 | TMSET Top margin adjust signal ... Analog
39 | ATH Fusing roller thermistor input signal
... Analog
33 | PE Paper empty sensor (H: Paper
presence)
FO-2850
Pin ,
No. In/Out | Signal Name Function
34 | PIN_ Paper input sensor (L: Paper
presence)
35 | DOP_ Door switch (L: Door open) ...
Analog
36 | POUT Paper output sensor (L: Paper
presence)
37 | TSEN Toner Sensor (H: Transparency)
38 | ТЕМР Room temperature thermistor input
signal ... Analog
39 — VrefLO GND
40 — Vss GND
41 О PUS Pickup solenoid control signal (H:
Drive)
Sine waveform output overlapped
42 О PWMSIN to MC (PWM output)
43 TC/BIASON | TC/Bias control signal (H: Drive)
44 — _ Vss GND
45 O Xtal Crystal connection port 1
46 | Xtal2 Crystal connection port 2
47 — TEST GND
48 | O PR Power relay control signal (H: Drive)
49 | (CMD) Not used (Pull up)
50 O (STS) Not used
51 | SMALLPAPER ay Paper Switch (H: More than
52 O FANON Fan control signal (H: ON)
53 | O HLON Heater lamp control signal (H:
Drive)
54 O MCON MC control signal (H: Drive)
(3) MAIN PWB - PCU interface
a. Block diagram
MAIN
PWB
SCLK
SDATA
DSADY
PCU
DCRDY
DREADY
DPAGE
(ENGINE)
VSYNC
HSYNC
DDATA
ERROR
RESERR
DPRIM
RESET
+5V
GND
ZNZN
E
FO-2850
b. interface signal
. Signal
name
Signal
direction
PCU CNT
Description
SDATA
— >
Bi-directional
This bi-directional line is used to send
data (command/status) by serial clock
(SCLK_).
SCLK_
Serial clock.
This sync clock is provided by the PCU
when data (command/status) are sent.
(1) When sending a command from
MAIN PWB to PCU:
The MAIN PWB delivers SDATA at
L of SCLK_, and the PCU latches
SDATA at T of SCLK_.
(2) When sending a status from PCU to
MAIN PWB:
The MAIN PWB latches SDATA at |
of SCLK_.
DSRDY_
Status ready signal. When the MAIN
PWB sends a command to the PCU, it
turns from LOW to HIGH.
DCRDY_
Command ready signal. When the PCU
sends a status to the MAIN PWB, it
turns from LOW to HIGH.
DREADY_
Engine ready signal. LOW: Print ready.
lt turns to HIGH during printing or when
an error occurs.
DPAGE_
Page signal. It turns to LOW when the
MAIN PWB makes a print request to
the PCU.
VSYNC
Vertical sync signal.
This signal is used to notice the start
position of one paper by means of the
edge from LOW to HIGH, (Itis
synchronized with the upper edge
reference position in the print aliow
area of paper.)
HSYNC_
Sync signal for every line. Used to take
timing for print start of each line.
DDATA_
Video data. At LOW, biack background
is printed.
After sending one line data and before
reception of next HSYNC_, this signal
level must be kept at HIGH.
ERROR
Engine error signal. HIGH when an
engine error occurs.
RESERR_
Error reset signal. LOW when the MAIN
PWB requests error cancel to the
engine.
DPRIM_
This signal is turned from HIGH to LOW
when the MAIN PWB requests
initializing of PWB Video 1/F to the
PCU. :
RESET_
Reset signal
+5V
J
GND
+5V supplied from the engine.
GND |
c. Communication system
The Video I/F performs clock synchronized serial communication of
command and status by means of the clock signal (SCLK_) from the
PCU and the bi-directional data line (SDATA).
Communication system: Clock synchronized serial communication
Start bit: None
Stop bit: None
Parity bit: None
Data width: 8 bits
d. Operations
1) Outline
When data are sent actually, signal lines of one direction
(DCRDY_/DSRDY_) are monitored. If sending is allowed, the SDATA
line is switched to the output mode, and data are sent-by SCLK_
suppiied by the PCU.
<<Status sending>>
(PCU > MAIN PWB)
<<Command receiving>>
(MAIN PWB — PCL)
SCLK
(PCU)
MAIN PWB uses
SDATA.
SDATA
(Bi-directional)
DCRDY
(PCU)
DSADY
(WPS ICU)
Open: Both PCU and MAIN PWB set the SDATA line to the input mode.
2) Details of operation
I) MAIN PWB — PCU (Command sending)
The MAIN PWB uses the SDATA line.
DCRDY
(PCU)
©
(1)
DSRDY
(WPS ICU) tatch Latch Latch Latch 7”
Y Y Y У EE
1501 (6)
(min)
MSB LSB
1 — hl й
SDATA > e
(Bi-directional) 7
3
(a 9 (a ©
0 | e
(PCL) 4 Omin
«> че»
2004 1504
(min) <— (min)
2004 2004
(min) (min)
(1) If DCRDY_ is LOW, the MAIN PWB drives DSRDY_ to HIGH.
(The MAIN PWB drives DSRDY_ to HIGH when it sends a com-
mand to the PCU.)
O) The PCU checks that DSRDY_ is HIGH. If there is no problem,
SCLK_ is driven to LOW and the MAIN PWB sets the SDATA line
to the output mode.
© The PCU drives SCLK_ to rise and latches the SDATA line.
@ Then the PCU drives SCLK_ to fall and the MAIN PWB outputs
the next DATA.
In this manner, procedures (3) and (4) are repeated to send data.
(6) After completion of data transmission (1 Byte), the SDATA line is
set to the input mode.
® The MAIN PWB drives DSRDY_ to LOW.
II) PCU — MAIN PWB |
DCRDY
(PCU)
в.
The PCU uses the SDATA line.
Fn
(2)
Latch Latch Latch Latch
Y Y Y Y
4
(1)
DSRDY
(WPS ICU) /
200 200
(min) (min) LSB
MSB
1—
SDATA
(Bi-directional) 0 ~
5
EA (5)
——— T1
SCLK |
(PCU) «>
5004 > imSec
(min) (max)
>
200u 200
(min) (min)
@ If DSADY_ is LOW, the PCU drives DCRDY_ to HIGH.
(2) The PCU checks again that DSRDY__ is LOW, and it sets the
SDATA line to the output mode and outputs data.
@ When the PCU drives SCLK_ to fall, the MAIN PWB latches the
SDATA line.
@ The PCU outputs the next data to SDATA and drives SCLK_ to
rise. Then procedures (3) and (4) are repeated to transmit data.
® After completion of data transmission (1 Byte), the SDATA line is
set to the input mode.
® The PCU drives DCRDY_ to LOW.
9-34
FO-2850
ITT) Data transmission timing
The interval of 1 byte serial communication from the MAIN PWB to
the PCU or from the PCU to the MAIN PWB is as shown below:
ml
Command from — 7)
the MAIN PWB
Status which is returned
by the PCU
6Omsec(Min)
osa" [7 | ЛС
DCRDY
ЛП
Note 3: "LJ" shown in the figure means one-byte communication.
M One-byte command is sent from the MAIN PWB to the
PCU.
One-byte status is sent from the PCU to the MAIN PWB.
The MAIN PWB acknowledges that the status has been
returned from the PCC, and it sends the next one-byte
command.
o
©
IV) Printing operation
DREADY
(12)
DPAGE
LL
SYNC | pbb Loo...
5) y (8) Y
Te
(13)
V SYNC /
/
ERROR m })
< |
Top margin HSYNC(MAX.1Opuls)
(M The PCU is at READY. (When DREADY_ is LOW.)
@ The MAIN PWB sends DPAGE_ to the PCU to start printing.
© When the PCU acknowledges DPAGE_ signal, it starts printing.
When printing is started, the PCU drives DREADY_ signal to
HIGH.
At that time, the page command (PGCMD:OAFH) is delivered
from the MAIN PWB.
When the PCU received this command, it sends back the page
acknowledgement status (PGACK:OAFH).
Since DREADY_ signal is driven to HIGH even when the PCU
detects an error, the MAIN PWB must judge whether the PCU
acknowledges DPAGE_ signal or it detects an error when
DREADY_ signal turns to HIGH by checking presence of ERROR
signal. |
O) The PCU drives VSYNC signal to HIGH at the timing of the top
margin reference position of print area after printing is started.
© After VSYNC is driven to HIGH, SYNC _ is delivered.
When prefeed is performed, the prefeed command
(РЕСМО:ОА2Н) 1$ delivered from the WPS IC afterwards.
When the PCU received this command, it sends back the prefeed
acknowledgement status (PFACK:OA2H).
(7) When the MAIN PWB detects the last line of PAGE which is
currently printed, it drives DPAGE_ signal to HIGH.
FO-2850
The PCU acknowledges that DPAGE_ signal is HIGH, and it
drives VSYNC signal to LOW.
© The PCU keeps DREADY to HIGH until completion of the internal
printing process. When the next printing is allowed, the PCU
drives DREADY_ to LOW (PCU at READY).
When continuing printing, the MAIN PWB performs the procedure
same as ©.
A The PCU performs the procedure same as O).
(2 The MAIN PWB performs the procedure same as @.
(3 The PCU performs the procedure same as 6).
When the MAIN PWB drives DPAGE_ signal to HIGH, max. 10 pul-
ses of HSYNC_ signal are inputted until the PCU drives VSYNC to
LOW.
Process to be taken when the MAIN PWB print format differs from the
paper set in the printer
* When LL format printing is made on LE paper, the PCU paper
pickup interval is set to the LE size. in this case, the CPU cannot
detect the paper size set in the engine. Therefore printing is made
in two sheets of LE paper, resulting in detective printing. —
The format and timing chart are shown in the following.
DREADY |
DPAGE — |
LE paper
4
+ LL size format
» 4 4
”—
Y) Video DATA
The number of vertical lines from the lead edge of paper in printing is
counted and controlled by SYNC_. The number of horizontal lines is
controlled at timing shown in the table and the figure below.
A
re be
First dot
| |. 8 | Last dot
Pye ! Second dot
; !
— | ___ |
DDATA | XY / o
Se? The
next
One line DATA ling
| Left edge of paper
When the last bit of one line is completed, the MAIN PWB drives the
DDATA_ line to HIGH. |
The value of "C" indicates the time from falling of SYNC_ to the first
dot data output. It locates at the left edge of the paper.
Resolution Time
A
1.693 mSec
B
3— 10 uSec
С
(19.98 uSec)
The MAIN PWB performs the following controls in addition to the
above functions.
D
(56.4 nSec)
600 dpi
a) Top margin control
For DPAGE_ signal from the MAIN PWB, the first SYNC_ signal is at
the top margin reference position of print area.
The MAIN PWB controls the print area according to it.
b) Left margin control
The MAIN PWB controls the left margin in the horizontal direction of
the print area of the paper.
c) Video clock and jitter correction circuit
Video clock is generated in the ICU. Therefore SYNC_ and Video
clock is not synchronized, jitter would be produced if there were not a
jitter correction circuit. The MAIN PWB corrects it.
VI) Power ON
Since there is a bi-directional line, the following sequence is per-
formed when the power is turned on.
Power (+5V)
RESET_(To WPS ICL)
SCLK_
SDATA
DCRDY_
VSYNC
ERROR
DREADY_
DSRDY_
DPAGE_
RESERR_
DPRIM_
During this period, the WPS ICU must set SDATA to input. Even
though DSRDY_/DRAGE_/ or RESERR_ signal is sent during this
period, the PCU disregard it.
If an error occurs in the engine, the ERROR signal keeps at HIGH
and the DREADY signal does not fall to LOW.
VII) DPRIN_ signal
The MAIN PWB initializes the PCU (engine) with DPRIM_ signal.
The PCU initializes the following items by receiving DPRIM_ signal.
® Clearing the send/receive buffer inside the PCU
* Clearing the serial communication port
150ms MIN
DPRIM O
DSRDY |
DREADY —_J(a) ®
CMD Enabled Disabled Enabled
Transmission
(D The MAIN PWB requests the PCU to initialize with DPRIM_ sig-
nal. In this case, the LOW period of DPRIM_ signal is 150 msec.
The SDATA line is set to the input mode, and DSRDY_ signal is
driven to LOW.
@ When the PCU detects DPRIM_ signal, it drives DREADY_ signal
to HIGH to clear the internal buffer (command/status) and initialize
the communication port (to the non-communication mode). (Even
during communication, if DPRIM_ is detected, initializing is per-
formed unconditionally.)
@ When the engine reaches the standby state, the PCU drives
DREADY_ to LOW. Under this state, serial communication is al-
lowed.
When DPRIM_ signal is received during printing, the PCU immedi-
ately stops printing, discharges the paper which is under feeding, and
goes to the READY state.
When the MAIN PWB delivers DPAGE_ signal if DPRIM_ signal
(reset of communication between the PCU and the MAIN PWB) is
supplied, DPAGE_ signalis immediately turned to HIGH.
VIII) Control code
When the PCU detects an error, it drives the ERROR signal to HIGH
and takes one of the following flags according to the conditions.
Priority; Error kind | Status | Bit Content
— | Cleaning STSA | D6 |Active after turning on the
cycle power until the engine reaches
the print allowable state in the
preliminary rotation after
closing the cabinet.
— | Operator STSA | D5 [In all errors, when even one
Call error occurs.
— |Hardware STSA | D4 |When an STSC.D error occurs.
Error
Toner Near | STSB | D1 'Setto 1 when PCU detects
7 {End that toner of imaging Cartridge
is near end.
Toner STSB | D6 |Set to 1 when PCU detects
6 Empty that there is no toner left in
Imaging Cartridge.
5 Paper STSB | D5 |When paper is exhausted.
Empty (Cleared when paper is
supplied.)
4 Paper Jam | STSB | D4 |When a paper jam occurs.
(Cleared by RESERR_ or
when the door is opened and
closed.)
imaging STSB | DO ¡Set to 1 when PCU detects the
3 |Cartridge absence of Imaging Cartridge.
Absent
2 Printer STSB | D3 {When the printer is opened.
Open (Cleared when canceled.)
1 PCUROM | STSC | D6 |PCU ROM check sum error.
Error The PCU is not cleared.
Cleared when the power is
turned OFF/ON. (At power ON
only.)
PCURAM | STSC | D5 |PCU RAM check sum error.
Error The PCU is not cleared.
Cleared when the power is
turned OFF/ON. (At power ON
only.)
Sirial I/O STSC | D3 | Serial communication error.
Error The PCU is not cleared.
Cleared when the power is
turned OFF/ON.
Optical unit | STSD | D6 | Optical unit error. The PCU is
error not cleared. Cleared when the
power is turned OFF/ON.
High fusing | STSD | D3 | High fusing temperature error.
temperature The PCU is not cleared.
error . Cleared when the power is
turned OFF/ON.
Low fusing | STSD | D2 |The standby state for fusing is
temperature not reached within the
error specified time. The PCU is not
cleared. Cleared when the
power is turned OFF/ON.
Fusing STSD | D1 [The fusing thermistor is
thermistor opened. The PCU is not
open error cleared. Cleared when the
power is turned OFF/ON.
FO-2850
IX) Error occurrence and cancel
I) Printer Open (auto reset)
Error Cancel
y Y
Actual machine — Openg> ©
Printer Open M 5
Printer Open Flag ON 1 a
(Operator Call) a
|
ER
ERROR signal |
DREADY_ signal —
RESERR_ signal
(@ Preliminary rotation
\
| ®
if an error remains.
(D The PCU detects an engine error (Cabinet Open), takes the Cabinet
Open Operator Call flag, and drives the ERROR/DREADY signal to
HIGH.
At that time, the MAIN PWB acknowledges the cause of the error
by means of the status.
@ The user cancels the error.
@ The PCU clears the Printer Open flag, then drives the ERROR
signal to LOW.
@ The PCU warms up the engine.
O) When an error is detected again, the process returns to M).
IT) Paper Empty (auto reset)
Error Cancel
y v
Actual machine Empty > 10
Printer Empty 1) ©
Printer Empty Flag ON |
(Operator Call) J |
ERRCR ®
ERROR signal | —le
DREADY_ signal |
k
RESERR_ signal @ a
if an error remains.
(D The PCU detects an engine error (Paper Empty), takes the Paper
Empty/Operator Call flag, and drives the ERROR/DREADY signal
to HIGH.
At that time, the MAIN PWB acknowledges the cause of the error
by means of the status.
@ The user cancels the error. (Paper is supplied.)
@ When the PCU detects paper, it drives the ERROR signal to LOW,
then the DREADY _ signal to LOW.
@ When an error is detected again, the process retums to ().
FO-2850
HI) Paper Jam (When Printer Open is used to cancel)
Error Printer Open Jam cancel Printer Close
y O
Actual machine Jam
Paper Jam
D
(PINSW NN
Printer Open flag ON
(Operator Call)
ON
®
Preliminary rotation
Paper Jam fiag
(Operator Call)
‚ ERROR
Error signal
DREADY _ signal
RESER signal
DPAGE_ signal
®
if an error remains.
(1) The PCU detects an engine error (Paper Jam), takes the Paper
Jam/Operator Call flag, and drives the ERROR/DREADY signal to
HIGH. At that time, the MAIN PWB acknowledges the cause of
the error by means of the status.
When the DPAGE_ signal is LOW during printing, if the MAIN
PWB detects that the ERROR signal is HIGH, it drives the
DPAGE_ signal to HIGH to stop all printing operations.
@ The user opens the cabinet to cancel the jam. At that time, the
PCU takes the Printer Open flag.
@ The user cancels the jam. At that time, the Paper Jam/Operator
Call flag is not cleared.
(4) The user closes the printer. When the PCU detects the Printer
Close, and if there is no error remained, the Printer Open/Paper
Jam/Operator Call flags are cleared.
6) The PCu warms up the engine.
© When an error is detected again, the process returns to D.
IV) Paper Jam
(When the PÍN switch is not turned on because of malfunc-
tion in packing up, causing a paper jam, and PE is used to
cancel.)
Error Cancel (Without Printer Open)
Y YO)
Jam
Actual machine
Paper Jam
(PUS) ON
(PIN_SW) OFF
(PE_SW) ON
Paper Jam flag
(Operator Call)
Preliminary rotation
ERROR signal ERROR
DREADY_ signal
RESERR signal
DPAGE_ signal —
AD
If an error remains.
(D The paper is picked up, but the PIN switch is not turned on so
that the PCU detects Paper Jam, takes the Paper Jam/Operator
Call flag, and drives the ERROR/DREADY signal to HIGH.
At that time, the MAIN PWB acknowledges the cause of the error
by means of the status.
When the DPAGE_ signal is LOW during printing, if the MAIN
PWB detects that the ERROR signal is HIGH, it drives the
DPAGE__ signal to HIGH to stop all printing operations.
@ The user cancels the jam without Printer Open. In this case, the
Paper Jam/Operator Call flag is not cleared. (if the jam is cleared
by Printer Open, the process of c) stated above is performed.)
(3) When the user removes the paper from the engine paper feed tray
to generate a paper empty error, the PCU does not inform the
MAIN PWB of the paper empty error.
@ The user sets paper on the engine paper feed tray.
® If there is no error remained, the Paper Jam/Operator Call flag is
cleared.
® The PCU warms up the engine.
©) If an error is detected again, the process returns to M.
(M) When an error except for the Paper Empty error occurs,
the engine stops printing operations immediately. At that
moment, therefore, HSYNC_ and VSYNC are not
generated.
Note:
When two or more errors occur (even not simultaneous-
ly), the one which has a higher priority is displayed.
(Example)
When Paper Open is generated after Paper Jam, the
host driver displays Paper Jam first, then changes the
display to Printer Open when the printer is opened.
The SERVICE error (the highest priority checked by
STSC/STSD) cannot be canceled by the user. There-
fore, the host driver shows the message of Serviceman
Call.
V) Commands sent from the MAIN PWB to the PCU
Status A Read [80h] : SSA
Command A which is sent from the MAIN PWB to the PCU to sense
the engine status.
When the PCU receives this command, it senses the engine status
and stores the status to STSA which is an attribute of SSA, and
sends it back to the MAIN PWB.
Status B Read [81h] : SSB
Command B which is sent from the MAIN PWB to the PCU to sense
the engine status.
When the PCU receives this command, it senses the engine status
and stores the status to STSB which is an attribute of SSB, and
sends it back to the MAIN PWB.
Status C Read [82h] : SSC
Command C which is sent from the MAIN PWB to the PCU to sense
the engine status.
When the PCU receives this command, it senses the engine status
and stores the status to STSC which is an attribute of SSC, and
sends it back to the MAIN PWB.
Status D Read [83h] : SSD
Command D which is sent from the MAIN PWB to the PCU to sense
the engine status.
When the PCU receives this command, it senses the engine status
and stores the status to STSD which is an attribute of SSD, and
sends it back to the MAIN PWB.
Paper Switch Read A [86h] : PSWRA
This is a command. which is sent from the MAIN PWB to the PCU to
sense the engine switch status.
When the PCU receives this command, it senses the engine switch
status and stores the status to PSWSA which is an attribute of
PSWRA, and sends it back to the MAIN PWB.
ROM Version Read [8Fh] : ROMVER
This is a command which is sent from the MAIN PWB to the PCU to
sense the PCU ROM version (1 Byte).
When the PCU receives this command, it stores the version to VER
which is an attribute of ROMVER, and sends it back to the MAIN
PWB.
PreFeed Command [O A2h]: PFCMD
This signal is sent from the MAIN PWBS to the engine to start pick-up
without waiting for the engine ready state in order to increase printing
speed in continuous printing. When the engine receives this com-
mand, after a certain time from when PIN sensor OFF is detected,
pick-up is started without confirming the PAGE_LOW for the next
page.
_ Standard Temperature Control [O A4h]: STDTC
This command is sent from the MAIN PWB and used to control the
temperature in- the engine fusing unit. When the PCU receives this
command, the PCU sets the engine fusing unit temperature control to
the default (similar to the state immediately after power ON).
Mid Temperature Control [OA5h]: MIDTC
This signal is sent from the MAIN PWB to the PCU, and is used to
contro! the temperature in the engine fusing unit.
When the PCU receives this command, it changes the temperature
control setting of the engine fusing unit so as to allow printing on
postcards.
High Temperature Control [OA6h]: HITC
This signal is sent from the MAIN PWB to the PCU, and is used to
control the temperature in the engine fusing unit.
When the PCU receives this command, it changes the temperature
control setting of the engine fusing unit so as to allow printing on
envelopes.
FO-2850
Page Enable Command [OAFh]: PGCMD
This command is used for the engine to judge if the PAGW signal
from the MAIN PWB is effective to the PFCMD or not.
if PFCMD is received by the engine after PAGE_signal LOW, and
when PFCMD is received afterwards, the PFCMD becomes effective
to perform prefeed operation.
if PFCMD is received by the engine after PAGE signal LOW, and
when PGCMD is received afterwards, the PFCMD becomes invalid.
XT) Control code list
Command/status list
CONTROL
CODE PROCEDURE FUNCTION
CODE| NAME [WPS LINE PCU
80 SSA 80 — Reads status A.
« STSA -
81 SSB 81 — Reads status B.
— STSB
82 SSC 82 > Reads status C.
. « STSC
83 SSD 83 — Reads status D.
+ . STSD
86 | PSWRA| 86 3 Reads the paper switch
<— PSWSA status.
8F ¡ROMVER| 85 — Reads the PCU ROM
< VER version.
0A2 | PFCMD | 0A2 > Preteed command
— 0A2
0A4 | STDTC The engine fusing unit
temperature control is
ok > changed to the default.
0A4
(Print on postcards,
envelopes) (Not used)
0A5 | MIDTC The engine fusing unit
0A5 — temperature control is set
— OAS |so as to allow printing on
postcards. (Not used)
0A6 HITC The engine fusing unit
0A6 — temperature control is set
€ 0A6 [so as to allow printing on
envelopes. {Not used)
0A3 | HCSTT |0A3 — Performs heater control.
€ 0A3
Status attribute list
Bit STSA STSB STSC STSD PSWSA
D7 0 0 0 0 0
Cleaning PCU ROM Optical
DE Cycle Toner Empty Error System Error 0
Paper
D5 | Operator Call | Paper Empty le RAM О Printed Out
ror x
Switch
Hardware Paper Input
D4 Error Paper Jam 0 О Switch
| Sirial Paper
D3 0 Printer Open | Communica- Heater an presence
tion Error pmpérature Upper Tray
Toner Near Heater Low
D2 0 End | © Temperature 0
Imaging ;
D1 Reserved Cartridge 0 thermistor Small paper
Absent pen Sue
DO | Reserved 0 0 0 О
FO-2850
Heater Control Start Command [A3h] : HCSTT
Heater lamp control command, which is sent from MAIN PWB to
PCU.
When this command is received, PCU sees the engine status and if
no abnormality is observed, PCU performs heater control for 3
minutes only. (The heater conrtol stop after 3 minutes.)
If there is some abnormality, PCU ignores this command. If
DPAGE_ signal is sent from ICU during these 3 minutes, PCU quickly
moves to print the job. When the printing ends, PCU stops the heater
control, even if 3 minutes have not passed, yet. This command is
provided to minimize the time until the first print of a job. By starting
the heater lamp control before DPAGE_ signal is generated, the first
print can be smoothly started.
Toner Near End
Toner Near End bit is set to 1, it PCU detects the toner near end by
looking at the toner sensor status while the engine's main motor is
running.
Toner Near End is not an Operator Call error.
At power ON or at the time of the printer cover open, this Toner Near
End bit has not been set to 1. If after Toner Near End bit is set to 1,
toner in Imaging Cartridge is mixed and replaced into the engine,
there is a case when the bit is cleared.
Toner empty (END)
Toner Empty bit is set to 1 if PCU detects the toner end by looking at
the toner sensor status while the engine's main motor is running.
During printing operation, if PCU detects the toner end from the sen-
sor status, PCU will reserve the occurrence of the toner end untill the
end of printing operation.
Toner Empty is an Operator Call error.
At power ON or at the time of the printer cover open, this Toner
Empty bit has not been set to 1. If after Toner Empty bit is set to 1,
toner in Imaging Cartridge is mixed and replaced into the engine,
there is a case when the bit is cleared. When Toner empty bit is set to
1, Toner Near end bit is also set to 1.
Imaging Cartridge Absent
Imaging Cartridge Absent bit is set to 1 if PCU detects the absence of
Imaging Cartridge by looking at the toner sensor status while the
engine's main motor is running.
Imaging Cartridge Absent is an Operator Call error.
Once the imaging cartridge absent is detected, Imaging Cartridge
Absent bit is not cleared unless the printer is turned OFF/ON or the
printer cover is opened/closed.
At power ON or at the time of the printer cover open, this Imaging
Cartridge Absent bit has not been set to 1. When Imaging Cartridge
Absent bit is set to 1, Toner Near End bit and Toner Empty bit are
also set to 1.
(4) Unit control
a. Main motor drive circuit
This machine uses the 4-phase pulse motor, and is driven by the
following pulses and the circuit.
(Drive wave form)
4 Stop : Rotation _
MCA | | | | |
MCA_ 1 | i | 1 |
MCB
MCB_
' 1 '
'
1 ,
1 ' '
'
1 1 '
1
1
В
1 1 ' 1 "
‘
' 1 1 | :
x
' 1 '
,
1 1 ' ‘ +
'
, ' 4 '
(Motor drive IC (IC301, 302) internai circuit)
(1C301)
Vee
Protection
circuit (Heat
insulation)
Vref = Vs
oure Ace
IN1
IN2
INPUT OUTPUT MODE
MCA MCA OUT1 OUT2
0 0 00 со Stop
1 0 H С А
0 1 L H A
1 1 L L Brake
(C302)
Vee Vref £ Vs
{Protection
circuit (Hea i
Insulaton) OUT2 В сой
IN1
IN2
INPUT OUTPUT MODE
MCB MCB OUT1 OUT2
0 0 со со Stop
1 0 H L B
0 1 L H B
1 1 L L Brake
b. Paper feed control
The PUS signal is outputted from the CPU (1C304) to turn on the
paper feed roller clutch. To feed one paper to the transfer roller, the
paper feed roller must be turned one rotation. To turn the paper feed
roller one rotation, the paper feed roller clutch must be turned on
twice. The judgment whether paper feed has been normally operated
or not is made by checking that the paper in detector signal (PIN_) is
outputted or not after turning on the paper feed roller clutch.
If the paper in detector signal (PIN_) is not outputted even when the
paper feed roller clutch is turned on twice, the paper feed roller clutch
is turned on once more.
If the paper is not fed normally and the paper in detector signal
(PIN_) is not outputted even with the above operation, the PCU
judges it as a paper jam and the jam display is made.
The paper in detector signal (PIN_) is used for the top margin control
signal in addition to jam detection.
c. High voltage unit control
The high voltage unit outputs the following voltages:
* Main charger voltage (DC-950V + AC600V peak to peak)
* Transfer charger voltage (DC+2100V + AC600V peak to peak)
* Developing bias voltage (DC-390V)
The following signals are outputted from the CPU (IC304) to control
the above voltages.
* MCON
This signal is to turn on/off the main charger.
When this signal is outputted, TRQ407 is driven to the high im-
pedance sate. Then TRQ402 conducts to drive transformer T401.
As a result, the main charger voltage is outputted to the secondary
side of the transformer.
* TC/BIASON
This signal is to turn on/off the transfer charger and the developing
bias voltage.
When this signal is outputted, TRQ408 is driven to the high im-
pedance state. Then TRQ405 is conducted to drive T402 to output
the transfer charger voltage and the developing bias voltage to the
secondary side of the transformer.
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FO-2850
Paper feed roller
clutch signal
PUS
Paper in
sensor signal
PIN
1.25sec
* PWMSIN
This signal is to control the main charger voltage and the transfer
charger voltage. The PWM pulse of 285.3Hz ~ 305.3Hz is out-
putted.
This pulse waveform adds the AC component to the main charger
voltage and the transfer charger voltage.
By changing the pulse duty of this signal, the main charger voltage
and the transfer charger voltage are controlled (during temperature
correction operation).
When the pulse duty of this signal is changed, the collector cur-
rents of TRQ403 and Q401 are changed. Therefore, the base
current of TRQ401 and the drive current of transformer T401 are
changed to change the main charger voltage and the transfer
charger voltage.
R425, 428, C408, and 411 form a filter circuit which dulls the
waveform of PWMSIN signal.
PWMSIN
Frequency about 285.3Hz-305.3Hz
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FO-2850
d. Laser scanning unit
This unit controls the laser beam power and laser beam scanning.
The control is performed with the signals inputted or outputted to or
from the CPU (1C304).
(PCU laser control section)
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POT 7
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1) Signal functions
PMCLK
Clock signal for driving the scanning motor. (1.77KHz)
PMD
Scanning motor ON/OFF signal
APCSTT
Used to start the laser beam generating circuit.
SYNC
This signal is outputted when the laser beam scanned by the laser
beam sensor signal is sensed by the sensor (Photo diode D601).
Used for the left margin control.
VIDEO
This signal is used to control the laser diode emitting.
When the laser beam is emitted to perform the LEND process, the
LEND signal is outputted from the CPU (1C304). When laser beam
is emitted as image data, the DDATA signal is outputted from the
MAIN PWB.
TMSET
This signal is to control the top margin, and is adjusted with
VR301. Adjustment is performed by adjusting the time from when
the paper in sensor senses the lead edge of paper to when the
signal is outputted.
2) Laser beam power control
The laser beam power is controlled in the laser emitting unit PWB.
This circuit functions to keep the laser beam output power at a con-
stant level.
The laser beam output is monitored with photo diode D602 for
monitor. When the laser beam output rises above the specified value,
the impedance of photo diode D602 is decreased to decrease the
monitor input (3PIN) voltage of the laser diode control IC (C601).
Then the laser diode (LTO28GS) drive voltage is decreased to
decrease the laser beam output to the specified level.
When the laser beam output is decreased below the specified level,
the contrary operations are performed.
3) Starting operation
Warm-up operation of laser scanning is described below.
The operation is made when the cover is closed from the open state,
and is made before starting printing.
The PMCLK signal is the clock signal for scanner motor speed con-
trol. it is rectangular wavetorm of 1.77KHz.
(1) The PMD_ signal is to turn on/off the scanner motor. When this
signal is outputted, the scanner motor is operated.
@ After 2 sec of starting the scanner motor, the laser power control
signal APCSTT and the laser diode ON signal LEND are outputted
to output laser beams.
@ After 0.5sec from outputting the LEND signal and turning on the
laser diode, the LEND process operation is started.
Stop
Clock of 1,77KHz is always outputted.
J a
PMCLK
PMD_
(Scanning motor)
APCSTT
(Laser power
LEND_
After about 0.5sec of tuming on the LEND_ signal,
the LEND process is started.
FO-2850
4) LEND process operation
The LEND process operation means outputting the HSYNC
(HSYNC_) signal for left margin control.
To control the left margin, the scanning position of the scanning
mirror on the virtual area of the left side out of the margin must be
precisely detected when the scanning motor reaches the stable rpm.
Therefore, the dummy laser beam must be outputted to detect the
position.
The laser beam scanning position is detected by the laser beam
sensor, and the SYNC signal is outputted.
The dummy laser beam is outputted for every scanning of one line
only when the scanning position of the scanning mirror is outside the
left area of virtual paper. (The laser is forcibly turned on by the PCU
when the laser beam scanned by the scanning mirror come in front of
the laser beam sensor (left margin reference).)
(Note) The laser beam is not outputted continuously during printing
operation of one paper. It repeated ON and OFF for every
scanning of one line.
The laser beam is outputted only when the LEND process for
controlling the print left margin is made and when the print
image is drawn on the photoconductor.
С
LEND_
(Video)
SYNC
(1)
(D When the LEND_ signal is on, the dummy laser beam is out-
putted, and the scanned laser beam is detected by the laser beam
sensor to output the SYNC signal. When the SYNC signal is
outputted, the PCU detects the scanning position.
O) At the rising of the SYNC signal, the PCU turns off the LEND_
signal. By this, the dummy laser beam is turned off. When the
PCU detects the scanning position with the SYNC signal, the
dummy laser beam becomes unnecessary.
@ The draw signal Video_ is made from the DDATA_ signal of one
line outputted from the WPS ASIC. When it is outputted, the laser
beam is turned on or off accordingly. This corresponds to the
making of latent electrostatic images on the photoconductor drum.
@ When making of latent electrostatic images for one line is com-
pleted, the PCU turns on the LEND_ signal before the output
timing of the SYNC.
Procedures (1) ~ @ are repeated.
A B
1.693mSec 690uSec Typ.
Resolution
600DP!
C
250uSec Max.
5) Automatic acknowledgment of resolution
The PCU controls 600dpi when starting the LEND process.
When the scanner motor rotation is stabilized, the SYNC intervai is
judged.
FO-2850
e. Fusing unit control
The fusing section is heated by the heater lamp (400W). The heater
lamp is controlled (turned on/off) to keep the optimum temperature.
The following signals are outputted by the CPU (1C304) for control.
1) Signal functions
* HLON
This signal is to turn on/off the heater lamp. When this signal is
outputted, photo triac PD101 turns on to turn on triac T2. Then an
AC power is supplied to the heater lamp to turn on the heater
lamp.
* RTH
This is the output signal of the thermistor which detects the surface
temperature of the heat roller. It is inputted to the CPU (IC304).
The heater lamp is turned on/off depending on the value of RTH
voltage.
| UP (BLACK) HLL
a
| Hlamp CN5
! HLN
| UNDER (WHITE) +
| A110
| 10/12)
C113 =
0010 1KY
2) Protect against overheat
Though the heater lamp ON signal (HLON) is normal, if triac PH101
and T2 are kept ON, overheat may result.
To prevent against this, temperature fuses are used.
When the fusing roller surface temperature exceeds about 300
degrees C, the temperature fuse blows off to open the 12V power line
which drives the power relay RY101, opening the power line for the
photo triac PD101 and triac T2. Therefore, the power is not supplied
to the heater lamp.
A temperature fuse is also provided in the heater lamp power line. In
case of overheating, the heater lamp power line is opened directly.
f. Temperature correction for high voltage output and
fusing temperature
The high voltage and the fusing temperature are controlled to provide
the best print quality when the ambient temperature changes. The
ambient temperature is detected by the thermistor TH301.
1) Temperature correction of high voltage outputs (main charger volt-
age, transfer charger voltage)
As the ambient temperature rises, the output voltage is lowered to
keep the print density at a constant level.
TCR
TF WT
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Кро QuE Qu AAN
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MC output
Î -850V
-850V.
-750V-
Ambient temperature (°C)
The above correction is performed at the following timing.
(D When the power is turned on or during warming up after open-
ing/closing the cover.
(© When printing is started from the ready state.
2) Temperature correction of fusing temperature
As the ambient temperature rises, the control temperature is
lowered to keep the fusing temperature (fusing capacity) at a
constant level.
Fusing
temperature
control
A
(°C)
155—
150.
Ambient temperature ( “C)
g. Timing chart
(a) Warming up after turning on the power or opening/closing
the cover
Unit: sec
MM
PMD_
APCSTT
SYNC_
MC
PWMSIN Keeps at OFF.
TCAas output ) Cleaning
FO-2850
FO-2850
(b) Printing operation
DREADY
VSYNC
PRSTT
MM
PMD_
APCSTT
LEND_
SYNC
ЗУМО_ рр
MCON
ACSIN
TC/Bias ON
2.1min.(*1)
PUS
PIN_
POUT_
3.92
(11.2 … Letter size)
*1: Wait is supplied depending on the fusing temperature (ambient
temperature).
*2: Adjust with VR301. (Top margin adjusted with the PCU.)
*3: PIN sensor process
The PIN sensor has two actuators, the 1st actuator near the
drum and the 2nd actuator near the tray. The 1st actuator has a
slit. The pulse signal from the slit is used for the PCU to identify
the two actuators.
The outputs of the 1st and 2nd actuators of the PIN sensor are
as shown below.
OFF
PIN_ ON
A | | | B —] pis started in
«——
{
Picklu
«—» Min. 490ms.
! |
|
Max 250ms С —— 111
| |
| Max 50mg
ч—— — >
Pick-up is started
in min. 100ms.
Unit: sec
6.0
A) PIN OFF — ON: Since the s2nd actuator is ON, the 2nd actuator
pulse signal is outputted.
B) PIN ON — OFF: When the paper to be picked up next is not fed
erroneously together with the previous paper, the read edge of the
paper is detected by the 2nd actuator. When the PFCMD is
received, the next pick-up is started in min. 490ms.
C) PIN ON — OFF: When the paper to be picked up next is er-
roneously fed together with the previous paper, the rear edge of
the paper is detected by the 1st actuator. When the PFCMD is
received, pick-up is started in min. 100ms.
6. CCD PWB descriptions
Mounted on the CCD PWB are a CCD (charge-coupled device) and a
differential amplifier which amplifies the CCD signal.
When receiving the RSH signal, the CCD transfers the light quantity
data stored in the light receiving element located in the middle of the
CCD, to the shift register next to the light receiving element.
+12V
| Analog sift resistor
-_ ó
| CCD sensor light sensing section
>Output
Ш
CCD image sensor internal structure
Shift electrode
Light energy o—— to shift register
— Storage electrode
Photo diode
ий
Equivalent circuit of 1 pixel at light sensing section
The period from the input of one PROG (TG) signal to the input of the
next PROG signal is called the integrating time during which the
quantity of light is stored.
$1 (CLK1) and ¢2 (CLK2) are clocks which are used to output data in
the shift register from the CCD. Since the output of data from the
CCD requires the input of these clocks, it is thus necessary to input
enough clock signals to output more data than those in the CCD
during the integrating time (dummy signals).
The FO-2850 image sensors adopt the model ILX523A CCD linear
image sensor which features high sensibility and has 2700 pixels (11
um x 11 um) linearly arranged on it. It can scan an A4 page at 300
dpi (about 12 dots/mm).
The $RS (RS) signal is the reset signal for the CCD output signal.
The output from the CCD is expressed as electric charge equivalently
stored in the capacitor. For this reason, to fetch data from the CCD
pixel by pixel, every piece of data outputted from the CCD need to be
cleared before another piece of data is outputted. The ¢RS signal
(reset signal) is used for this purpose.
The signal outputted from the CCD is amplified about 3 folds in the
differential amplifier in the CCD PWB before being sent to the control
PWB. The ampiifier circuit on the CCD PWB helps reduce the effect
of noise.
FO-2850
(2) CCD
The reduction type CCD linear sensor (black and white) ILX523A is
used as the CCD element. The ILX112A allows scanning of A4 pages
at a resolution as high as 300 dpi.
NY
vout (1) (22) NC
vss (2) (21) NC
NC (3) (20) von
$ S/H (4) (19) Ti
NC (5) 6 AS
NC (6) (17) NC
NC (7) © NC
NC-(8) (15) NC
01 (9) (14) 62
NC (10) (13) NC
6 ROG (11) 2700 (12) nc
Pin descriptions
Pin No. | Pin code Pin descriptions
1 Vout Signal output
2 GND GND
3 NC NC
4 $S/H Sample hold pulse
5 NC NC
6 NC NC
7 NC NC
8 NC NC
9 61 Transmission pulse 1
10 NC NC
11 $ROG Read out gate puise
12 NC NC
13 NC NC
14 $2 Transmission pulse 2
15 NC NC
16 NC NC
17 NC NC
18 ¢RS Reset gate pulse
19 T1 Test pin (Open)
20 Vpo 12V power
21 NC NC
22 NC NC
(Note) When the internal sample hold circuit is not used, 4pin is
| grounded. |
FO-2850
Clock timing diagram (When internal S/H is not used)
5
$ ROG
0 — — + — — — —
5
0 1 | HI
0
5
¢ 2 || | |
0
"| ПТ О
т NOD + LA) ©
LC) Q a
D11
VOUT
Dummy signal (33pixels)
MK
D12
D13
D14
D15
00
Mm QO
Os Op O
Ora < y
(aaa? EE WY © © ©
I I
| .
Optical black :
| (18pixels) |
м —— — — >
1 |
|
Effective pixel signal
1... (2700pixels)
1line output period (2739pixels)
The clock pulse must be inputted over 2750 pulses.
7. Panel PWB descriptions
The panel PWB incorporates the tact switch, the LED, and the LCD
which are necessary for FAX operations, as well as the sensor re-
quired for ADF.
Gontroi sianai AOoOoooooooooooon
080
5540
O000900500900009900
——
LED drive signal Y
Sensor signal
= то к = око,
Eme 1 7 20cghsx@lines
ПО a}
| Switch matrix .
10 ot |
LS145 |
EA PIN PE
The switch is in matrix composition. It is periodically scanned by the
main control PWB to detect pressing of the switch. The data line of
the LCD control signal is commonly used with the key scan signal.
For controlling the ADF, the PE sensor which detects the presence of
documents, and the PIN sensor which detects that the document is
fed in front of the scan line are provided on the PWB.
S2700
D34
D35
D36
D37
D38
D39
uu nr
Dummy signal
(6pixels)
r
|
|
)
i
1
1
i
|
I
Ela
a
I
J
i
1
v___1
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