Canon NP 1550 copier SERVICE MANUAL

NP1550 SERVICE MANUAL Canon FY8-13BN-010 COPYRIGHT CANON INC. PRINTED IN JAPAN UNT GENERAL DESCRIPTION IN 1. FEATURES Copies as large as A3 in size (DIRECT) may be made, and the copyboard is of a fixed type. « Although compact in design the copier enables making copies as large as A3 in size in the . DIRECT mode. | —* The copyboardis of a fixed type so that pages of a book may be copied with much ease. . Zooming between 50% and 200%. » Copies may be made in reproduction rations of between 50% and 200%, selectable in 1% | increments. ВЕ . Front loading for faster supply of paper. + Paper is loaded from the front of the copier so that the cassette may be replenished with paper without wasting time. The design also saves space. . Single component fine particle toner for high resolution. « Copies are developed using the single component toner projection method. Further, the copier uses toner of extremely fine particles for enhanced image quality. | Multifeeder (stack bypass) pick-up. ‘+ As many as 50 copies (80 g/ni) may be made continuously using the multifeeding mechanism. COPYRIGHT © 1992 CANON INC. ' CANON NP-1550 REVO JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 1-1 BN GENERAL DESCRIPTION —_—_—_—_—_—_—————— Il. SPECIFICATIONS A. Type Body Desktop Copyboard Fixed Light sourse Halogen lamp (300W) Lens Zoom lens Photosensitive medium OPC B. System Reproduction Indirect electrostatic method Charging Corona Exposure Slit (moving light source) Copy density adjustment Auto or Manual Development Dry Pick-up Automatic Exclusive cassette Manual Multifeed Transfer Corona Separation Curvature and Static eliminator Drum cleaning Blade Fixing Heat roller (900W) C. Performance Type of document Sheet, Book,3-D object(2 kg) Document size A3 max, Wait time 75 sec (approx.;at 20°C) First copy 9.4 sec (A4, AE ON/OFF, 1:1) Continuous copying 99 copies Copy size A3(max.),A6(min,;148x105 mm) Type of Cassette Plain din to 80 g/m”), Tracing paper, copy paper Multifeed tray Plain paper(64 to 128 g/m”), Tracing paper*, Colored paper, OHP film*, Postcard, Label sheet "Use of tracing paper may cause double feeding. If thin paper or OHP film, feed one sheet at a time. 1-2 COPYRIGHT © 1992 CANON INC. CANON NP-1550 REVO JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) ea TT Ц con Multifeed tray Plain paper(64 to 128 g/m?), Colored paper, Postcard Overlay Multifeed tray Plain paper(64 to 128 g/m*), Colored paper, Postcard copying Claw Provided. | Cassette! Standard 27 mm deep(about 250 sheets of 80 g/m* paper) Universal None. Copy tray 100 sheets(approx.; A4, 80 g/m?) Non-image| Leading edge 2.0 +1.5 mm or less width (1st side) Left/Right 2,5 +1.5 mm or less Auto clear Provided. (2 min, standard) Auto shutoff None. Option ADF-A1, CT unit, MS-A1, Stapler Sorter-B1, CC-V D. Others TT Serial Numbers Power 240V 50Hz QBN XXXXX Maximum 1.5kW or less Power con- Standby 0.148 kWh (Reference value) |sumption Continuous copying| 0.04 kWh (Reference value) Noise Copying S5dB or less (sound power level Standby 40dB or less as prescribed by 150) Ozone 0.05ppm or less (UL standards.) Width 697mm Di- Depth 617mm mension Height 391mm Weight 50.6kg Temperature 15.0°C to 30.0°C Operatin environ- Humidity 5% to 80% ment Atmospheric pressure 0.6 to 1 Others Keep copy paper wrapped to protect against moisture. COPYRIGHT © 1992 CANON INC. CANON NP-1550 REVO JAN, 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) Es GENERAL DESCRIPTION lll HEN GENERAL DESCRIPTION EC ЛОЛ Cassette Reproduction mode Paper size Copies/min A3 (297x420mm) A3 9 A4 (210x297mm) A4 15 DIRECT B4 (257x365mm) B4 10 B5 (182x257mm) B5 17 ASR (210x149mm) A5R 16 I 50% REDUCE II A3 — A4 A4R 10 I A4 — A3 A3 9 ENLARGE Il 200% COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV.0 JAN, 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) Es GENERAL DESCRIPTION UBB „т a. Il. NAMES OF PARTS A. External View D © 3 @ | | {1 Copy tray (2) Copyboard cover (3) Control panel TS @ Power switch SA === | ©) Cassette (6) Delivery cover A — ==. E © © Figure 1-1 O je = (1) Copyboard glass — 0) Multifeeder cover 3 Multifeeder tray — (1) Developing assembly release lever FI { 6) Feeder assembly release В | , | lever | —: | pn ‘ @ Fixing assembly knob £ TT a — === == 10 @ © ® @ @ Figure 1-2 COPYRIGHT © 1992 CANON INC. . CANON NP-1550 REVO JAN, 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 1-5 ENS GENERAL DESCRIPTION E CES B. Cross Section D 009 O. © @ @ 03 (D No. 3 mirror @ No. 2 mirror (3) No. 1 mirror @ Scanning lamp (5) Copyboard glass © Copyboard cover (7) Lens | Pre-exposure lamp @ Primary corona assembly COPYRIGHT © 1992 CANON INC. No. 6 mirror dD No. 5 mirror (2 No. 4 mirror (3 Multifeeder tray Developing assembly (5 Feeder roller 1 Registration roller (7 Pick-up roller Feeder roller 2 Figure 1-3 © © © ® (9 Transfer corona assembly 00 Photosensitive drum QD Cassette 22 Feeder assembly 23 Exhaust fan 24 Fixing assembly @5 Delivery roller CANON NP-{ 550 REV.1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) и 7 A GENERAL DESCRIPTION HH IV. OPERATION A. Control Panel © © oF or (| (3-00 сама 200% es B= Odes 0000660 00000 Figure 1-4 : D SORT/GROUP key Press it to select the sort, group, or non- sort mode. The indicator remains unit when the non-sort mode is selected. 3 sorting 2- grouping (2) PAGE SEPARATION key Press it to select the page separation mode. (3) JAM indicator (4) CONTROL CARD indicator O) ADD PAPER indicator ® ADD TONER indicator @ COPY COUNT/RATIO indicator It indicates the reproduction ratio when the % key is pressed. COPY START key + glows orange when the copier is not ready for copying. » glows green when the copier is ready for copying. © RESET key Press it to reset the copier to its default settings. Default Settings * copy count 1 * DIRECT * AE (may be turned OFF using 'C15' of service mode) * non-sort COPYRIGHT © 192 CANON INC. 49 CLEAR/STOP key i) STANDBY key i NUMERIC keypad 13 % key Press it to check the reproduction ratio using the copy count indicator. The display changes to the copy count 2 sec after the key is released. (9 ZOOM key: Press it to select desired reproduction ratios between 50% and 200% in 1% increments. 6 AUTO RATIO key | Press it to select or deselect the auto reproduction ratio mode: The key is effective when the ADF is attached. © PAPER SELECT key Press it to select the cassette or multifeeder as the source of paper. (7 PAPER SELECT/JAM indicator A LED goes ON to indicate the location of the paper or flashes to indicate the location of the jam, if any. 19 ENLARGE key 49 DIRECT key 29 REDUCE key ED AE (automatic exposure (density) adjustment) key @ COPY DENSITY lever - CANON NP-1550 REV SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 1-7 EN GENERAL DESCRIPTION E A. B. Basic Copying Operation 1) Set the power switch to ON (1). a) If the temperature of the fixing roller is too low for copying, the indicator of the COPY START key will blink green. b) When the temperature of the fixing roller becomes high enough for copying, the indicator will glow green. c) The normal waiting time at room temperature (20°C) is about 75 seconds. Raise the copyboard cover, place an original on the copyboard with the side to be copied facing downward, and align it with the size indication. To adjust the copy density manually, the AE key indicator should be OFF; press the key once if it is ON. Set the COPY DENSITY lever to suit the original. Check the size of paper in the cassette. a) If the cassette does not have the desired size of paper, remove it and install a cassette with the desired size. 5) Set the required number of copies (1 to 99) using the NUMERIC keypad and confirm that the correct number appears on the COPY COUNT/RATIO indicator. a) - If an error was made in inputting the number of copies, press the CLEAR/STOP key and reset the number of copies. 6) Press the COPY START key a) To stop a continuous copying operation, press the CLEAR/STOP key or RESET key. The copier will complete the copy in progress, then stop. The COPY COUNT/RATIO indicator will display the initially set copy quantity. b) It is possible to switch from automatic exposure control to manual density adjustment at any time from the start of copying to the completion of the final copy. However, it is not possible to switch from manual density adjustment to automatic. N — æ = ww 1-8 COPYRIGHT © 1992 CANON INC. Example: If the copy is too dark or too faint using AE, cancel AE and vary the copy density with the COPY DENSITY lever. c) If the ADD PAPER indicator goes ON during copying, the copier will stop. - Refill the cassette and press the COPY START key. The remaining number of cópies will be made automatically. d) If the copier has a ADF, place a document (original) on the document tray. The document will be fed automatically and copying will start. | e) Ifino other operation is performed, the copier will return to the STANDARD mode approximately 2 minutes after it completes a copy or after the last key operation. C. Pick-Up from Multifeeder о — -- — — Set documents on the copyboard. Press the PAPER SELECT key to select the multifeeder. Open the multifeeder tray. Open the multifeeder cover. Set the slide guide to the size of the copy paper. Set copy paper. * As may as 50 sheets (80 g/m) may be set: Close the multifeeder cover. Set the desired reproduction ratio using the DIRECT, REDUCE, ENLARGE, or ZOOM key. Cancel the AE mode, and set the COPY DENSITY lever if manual adjustment of the density is desired. 10) Enter the number of copies using the NUMERIC keypad. 11) Press the COPY START key. E > TI. © CANON NP-1550 REV1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) E GENERAL DESCRIPTION - D. Two-Sided Copying Copy one side of a.2- sided original. Invert the original so that the same edge faces the front. : Invert the copy in the same way (front edge facing the front) and feed it into the copier. a) Use dry, uncuried paper. b) Use paper in the weight range 60 to 128 д/ т с) When making two-sided copies, only one image can be made on each side of the copy paper. d) Both overlay and two-sided copies cannot be made on the same sheet of copy paper. в едде | Back edge AB | | || SA Front edge DCI N Front edge Figure 1-5 E. Overlay Copy Operation By changing the developing assembly, a 2-color copy can be made on the same side of the copy paper. a) Use paper in the range of 60 to 128 g/m b) When making an overlay copy a maximum of two images can be made on one side of the copy paper. c) Overlay and two-sided copies cannot be made on the same sheet of copy paper. F. Auto Start The auto start mechanism may be made use of while the copier is in the wait mode (COPY START key blinking green); i.e., after it is switched ON or after the standby mode is cancelled. Set a document while the copier is in the wait mode, and select the copy mode; then, press the COPY START key. COPYRIGHT © 1982 CANON INC. The COPY START key changes from blinking green to orange to indicate that the . auto start mechanism has been activated. The copier starts making copies as soon as it enters the standby mode using the selected copy modes. | The auto start mechanism may be can- . celled by pressing the CLEAR/STOP or RESET key. G. Replacing the CT Unit 1) Open the front door. | 2) Swing the developing assembly release lever counterciockwise. 3) Pull the developing assembly forward. 4) Grasp the handle of the developing. assembly, and gently raise it. | Figure 1-6 5) Place the CT unit gently on the develop-. ing assembly guide rails and push it in the copier. 6) Shift the developing assembly release lever clockwise until it is horizontal. 7) Close the front door. rh: - hallo th à developing sec ace tha developing assembly yer in 4 ge bof or in 1 dare Lobia no ns ik dp PE E E ADE Ei ua al . i ae CANON NP-1550 REVA SEPT. 1982 PRINTED IN JAPAN (IMPRIME AU JAPON 1-9 El GENERAL DESCRIPTION E V. WARNING INDICATOR AND REQUIRED ACTION. A. JAM Indicator &\ If an area of this indicator flashes while copying is taking place, it is likely that the paper has jammed at the position represented by the part that is flashing. Check and take action as follows. > —— ADF unit document JAM indicator J Ze paper JAM indicator | = Right door OPEN indicator Cassette OUT indicator Sorter JAM indicator Figure 1-7 When clearing a paper jam which has occurred in an option unit (sorter or ADF), refer to the Service Manual for the option unit. » ADF unit document JAM indicator * Copier paper JAM indicator * Right door OPEN indicator * Cassette OUT indicator | « Sorter JAM indicator | If paper jams inside the copier, check the paper pick-up area, separation feeder area, fixing/copy delivery area, and cartridge area; and remove all jammed paper. 1) Open the front door. 2) Remove the copies from the copy tray. 3) Operate the release and open the copy delivery assembly. 4) Check if there is copy paper jammed in the fixing assembly. If there is paper jam in it, turn the knob of the fixing rollers clockwise to remove the jammed paper. Figure 1-8 COPYRIGHT © 1992 CANON INC. 5) Close the copy delivery assembly. 6) Check if there is paper jammed in the separation/feeder area. If there is, swing the feeder release lever counterclockwise to open the feeder, then remove the jammed paper. Be careful not to tear it. “ NOBEL oon a e an De i € A us Pa o 2 : SE, CRT ve | = бес a ВИ ; : но = Vhen removing jammaéd paper from НЫ > AAN ETT E: e ST - e Y a. 2 [a Hon be very careful notto.. ! cases =. dg Fe 2, oo E : Hu Pa “Y doa Fin Sr ey ER TAT aa E ИД E E Lo. aa E Fe aa Tg a OUCH Ine: ve gram. В > e У o X ; x ; pis dé ne 2 un wl NU De no E SR Pa" TE Ah LL AEREA A A o 203320 9 Es Г Figure 1-9 7) Open the multifeeder cover, and remove the paper from the multifeeder tray. 8) Hold the grip found at the bottom of the multifeeder cover, and open the right door; then, remove the jam. Figure 1-10 CANON NP-1550 REV.1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) mT 9) Close the right door. > ‘Figure 1-11 10) Close the front door. : COPYRIGHT © 1992 CANON INC. GENERAL DESCRIPTION E B. ADD PAPER Indicator 1. Cassette | The indicator goes ON when no cassette is found in the cassette or no paper is found : inside the cassette. le ‚ 1) Push the center of the cassette. » The cassette springs out automatically. - - hy Su >" ~ >. — ~ >. `` x ~ A >. ~ “= > ~ - “a > ~. ~. N > >. ~ Sw - > ~ ~~ м” 7 - - - > > ~ - = ” = = - „” `` - а о. ~ | - - “J = Figure 1-12 2) Set copy paper inside the cassette. | * As many as 250 sheets of copy paper (80 g/m) may be set. | Figure 1-13 3) Hold the center of the cassette, and slide it into the cassette holder until it stops. 2. Multifeeder The indicator goes ON: when the paper on the multifeeder tray is not positioned correctly or the multifeeder cover is left open. * As many as 50 sheets of copy paper (80 g/m) may be set on the multifeeder tray. ‚CANON NP-1550 REVO JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 1-11 EM GENERAL DESCRIPTION ML. C. ADD TONER Indicator |}, This indicator flashes when the amount of toner in the black developing assembly has become low. 1. Black developing assembly 1) Open the front door. ' 2) Turn the developing assembly release lever counterclockwise. 3) Pull the developing assembly forward as far as possible. 4) Open the top cover of the developing assembly. 5) Shake the toner cartridge back ‘and forth about 10 times. 6) Place the toner cartridge on the developing assembly. 7) While holding the toner cartridge in place, remove the seal slowly to allow the toner to flow out. Figure 1-14 8) Tap the top of the toner cartridge to remove any toner remaining in the cartridge. 9) Carefully remove the toner cartridge. 10) Close the top cover of the developing assembly. 11) Put the developing assembly back into the copier. 12) Swing the developing assembly release lever clockwise. 13) Close the front door. 1-12 COPYRIGHT O) 1992 CANON INC. 2. CT Unit (color developing unit) If copy images become faint, the color toner has probably run out. In this case, replace the CT unit. The copy image can sometimes be temporarily restored by placing the CT unit in its storage box and agitating it. | За бо веде ком E D. CONTROL CARD Indicator (za The control card indicator operates on a copier with a control card unit. lt flashes in the following cases. a) When there is no control card in the control card unit. b) When there is a control card in the control card unit but the indication on the control card unit is "P" or "EE". CANON NP-1550 REV.1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) DT Ds GENERAL DESCRIPTION EEE | VI. DAILY INSPECTION TO BE PERFORMED BY THE CUSTOMER Carefully instruct the customer to be sure to clean the following parts of the copier once a week. 1. COPYRIGHT © 1992 CANON INC. Primary corona assembly Slide in and out the wire cleaner to clean the corona wires. . Copyboard glass Clean the copyboard glass with a damp cloth, then wipe it dry. . Copyboard cover Clean the copyboard cover with a mild detergent solution, then wipe it dry. . Transfer corona assembly Remove the transfer corona assembly from the copier, then slide the knob (wire cleaner) at the bottom of the transfer corona assembly back and forth to clean the corona wires. Further, clean the static eliminator using the cleaning brush (accessory). CANON NP-1550 REV.1 SEPT. 1982 PRINTED IN JAPAN (IMPRIME AU JAPON) NE COPYING PROCESS E TT — I. IMAGE FORMATION PROCESS A. Outline opr board glass 77 x 77 ZZ] À —e— Scanning amp 700 Lens ST TT TT oman № Developing | Primary corona assembly assembly | Pre- -exposure lamp SEEN Naw RL Cleaning roller Drum cleaner A / | yn corona assembly Static charge eliminator Lower fixing roller | Figure 2-1 This copier consists of the units shown in Step 3: Image exposure Figure 2-1. Step 4: Developing (positive plus AC) The image forming process is divided into Step 5: Transfer (negative DC) the eight steps shown below. Step 6: Separation TT, Step 1: Pre-exposure Step 7: Fixing | ; Step 2: Primary corona (negative DC) Step 8: Drum cleaning . Electrostatic latent image formation block | | г) | | 7 п-т C 1. Pre-exposure D , ( 4. Developing ) [< C Registration ) C Cassette a > Gpo о «> Flow of copy paper +— Direction of rotation of drum Figure 2-2 COPYRIGHT © 1992 CANON INC. | CANON NP-1550 REV.1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 2-1 Ell COPYING PROCESS The outer surface of the photosensitive drum is a layer of organic photoconductor (OPC).The base is an aluminum (conductive) cylinder. Photoconductive layer Base Figure 2-3 B. Electrostatic Latent Image Formation Block This stage consists of three steps. At the end of the stage, the drum has a pattern of negative electrical charges on its surface corresponding to the dark parts of the document image. The light areas of the document image are represented on the drum by an absence of charges. The pattern of negative charges cannot be seen by the eye, hence it is called an electrostatic latent image. Time (t 0 () = ин-т 2 Ke © / © / Light area > / 5 -500- J © / 8 — £ e 3 ca © 9 ЕЙ | © 29] 8 Dark area 5 ar Ti as o“ © a 10004 2 à Eo Image exposure à x| a &| (step 3) Figure 2-4 2-2 COPYRIGHT © 1992 CANON INC. C. Step 1 Pre-Exposure es Pre-exposure lamp A Filter Figure 2-5 Before the primary corona step, light from the pre-exposure lamps is shone onto the surface of the drum (pre-exposure). This process eliminates residual charges and helps to make the density of the copy even. D. Step 2 Primary Corona Figure 2-6 The primary corona (negative) applies a uniform layer of negative charges over the drum surface. The drum surface potential is determined by the grid potential. The grid is connected to ground through a varistor, which holds the drum potential constant at the varistor break- down voltage. CANON NP-1550 REV SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) Primary corona assembly E COPYING PROCESS ME E. Step 3 Scanning Exposure Optical image || Dark area | Light area CELE ELA AA ia a fr myer rl ENE Pay Rabb at nau th AARNE ER DULLER] AN ATLL EEA EE LL LL y TENEEENETNAFENÓd Ark вовяатья тая rETEN IA Figure 2-7 Light from the original is projected onto the drum surface. Charges in these light areas on the drum are neutralized by drum photosensitive effects. F. Step 4 Developing Blade Cylinder Developing Magnet } cylinder Figure 2-8 As shown in Figure 2-8, the developing assembly consists of a developing cylinder (a stationary magnet surrounded by a rotating sleeve) and a blade made of magnetic material. Black toner is a single component type consisting of a fine powder of mixed magnetite and resin binder. The toner has insulating properties and is charged to a positive potential by friction with the rotating cylinder. COPYRIGHT © 1992 CANON INC. Color developer is a two-component type consisting of iron powder (carrier) and toner mixed together in a fixed ratio. The main component of the toner is resin. The toner is charged to a positive potential and the iron powder to a negative potential by friction with the rotating cylinder. | | Blade Concentrated || ./ magnetic field e e oO A A я ai Ue PPC ВА Y LLL TF "LA IE Developer Magnet Figure 2-9 A concentrated magnetic field develops between the magnet and the edge of the. blade. This field attracts the charged developer. ‚ The developer is held virtually immobile by the magnetic field, forming a curtain along the edge of the blade. As the cylinder rotates, this curtain skims the toner particles on its surface to a thin uniform layer. An AC bias plus a negative DC bias are applied simultaneously to the developing. cylinder so that the waveform of the developing bias has a larger negative excursion than positive. Г | Г — Positive | excursion 7 IF T7 | Negative _'y excursion DC bias Figure 2-10 During copying toner is attracted to the, drum by the charges on the drum surface and by repulsion due to the developing bias (during the positive excursion), transforming the latent electrostatic image into a visible image. Excess toner particles are attracted: back to the cylinder from the drum due to the charges on the drum surface and the developing bias (during the negative excursion). | The DC bias affects copy density and fogging: As the DC bias becomes less negative (approaches 0V), the density and degree of fogging both increase. CANON NP-1550 REV.) SEPT 1982 PRINTED IN JAPAN (IMPRIME AU JAPON) 2-3 ES COPYING PROCESS ENT О ВОООННОАНИя G. Step 5 Transfer Copy paper — Sa | | | F-—rranste corona assembly |. Figure 2-11 In this step, a negative corona is applied to the back of the copy paper, attracting the toner from the surface of the drum to the copy paper. 2-4 COPYRIGHT © 1992 CANON INC. . H. Step 6 Separation Copy paper — Static charge | eliminator Figure 2-12 — The copy paper is separated from the drum by utilizing its stiffness. Thin paper, however, is not stiff, and may wrap around the drum instead of separating from it. To prevent this, a positive voltage is applied to the separation static charge eliminator, weakening the attraction between the drum and the copy paper. This enables the paper to separate easily from the drum. CANON NP-1550 REV.\ SEPT 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) TT Nd 7 > F 5, l. Step 7 Fixing Cleaning roller Upper fixing roller Tungsten-halogen heater (900W) Toner Copy paper Figure 2-13 In this step, the copy paper is pressed between two heated rollers to make the toner image permanent. To prevent the copy paper from wrapping around the roller and toner offsetting (adhesion of toner to the roller and transfer of the toner to the next copy), the surface of the upper fixing roller is cleaned with the cleaning roller. J. Step 8 Drum Cleaning Cleaning blade Paddle Toner catcher Figure 2-14 This step prepares the drum surface for the next copying operation. Any residual toner scraped off the drum by the cleaning blade and picked up by the toner catcher. it is then pushed to the back by the paddle. COPYRIGHT © 1982 CANON INC. COPYING PROCESS ll ll. AUXILIARY PROCESSES A. Blank Exposure | Blank exposure is the process of shining light onto is simply the removal of the drum surface potential in the non-image areas resulting from REDUCTION copying and, using some cassette sizes (paper sizes). The light for this is produced by the precondition-. ing lamp and is reflected onto the drum by a reflector. | In the non-image area on the drum between successive sheets of copy paper, the grid bias of the primary corona is reduced’ to prevent adhesion of toner. For these areas, there is no blank exposure for removal of the surface charges. B. Ozone Filter A catalytic ozone filter in the exhaust fan prevents ozone {generated by the coronas) from escaping to the atmosphere by con- verting the ozone to oxygen. CANON NP-1550 REV.0 JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON} 2 - 5 EE OPERATIONS AND T(MING HE |. BASIC OPERATION A. Functions The copier can be divided into four functional sections: paper pick-up and feed system, exposure system, image formation system, and control system. | | [contra panel] | | | Copyboard | | | $ ! NE | | Scanner | [Control circuit | | | ‘ — Optical нм kb .— — — == = — == ' — ——— system _ Г y image tormation | | |” system Primary corona e ' ' Photosens- tive drum Developing M assembly Cleaning unit | | | | | | ] | _ | Transfer and CC | | separation Pick | = | bl Р | ` Feeder assembly control | !Paper delivery assembly | [tray Copy delivery L— assembly Fixing assembly | | | | | Cassette | | Paper pick-up and feed system | Figure 3-1 COPYRIGHT © 1982 CANON INC. CANON NP-1550 REV.1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-1 HE OPERATIONS AND TIMING SE B. Outline of Electric Circuitry The NP-1550's main mechanisms are controlled by the microprocessor, PROM, and EEPROM on the DC controller PCB. 1. Microprocessor (Q303) * controls the copying sequence * controls the control panel * controls the main motor/scanner motor * controls the scanning lamp * reads the analog signals 2. PROM (Q318) * contains the sequence program 3. EEPROM (Q315) | stores data that can be modified in the service mode (replaces conventional variable resistors and switches) Note: Ars eee a | + EEPROM je: a à type of roue i which 3-2 COPYRIGHT © 1932 CANON INC. - Note; > a av Te NP: 2156005 CANON NP-1550 REVO JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) EEN OPERATIONS AND TIMING II (Sensor) (Control panel) DC controller PCB Scanner home position sensor Lens home position sensor Cassette paper sensor Delivery paper sensor Pre-registration paper sensor Multifeeder paper sensor Microprocessor (Q303) PROM ol. (Q318) EEPROM (Q315) Cassette size sensor Right door switch AE sensor Control panel Driver (Q308) | Black toner leve! sensor | Thermistor Sensors, Swilches ALEA $T (Loads? | power supply PCB Fixing roller heater HVT | ”| Primary/Transter ' corona assembly Developing bias Grid bias Muttifeeder clutch Registration roller clutch Lens solenoid Pick-up clutch solenoid Blank solenoid Mullifeeder solenoid Lamp regulator ‚ |=] scanning lamp | Scanner motor | | [| Pro-exposure lamp | | Exhaust fan [| Scanner cooling fan | Feeder fan | Lor ОН ООО ОО ОООНННИ J ! | I | \ P>>H Microprocessor | Sensors, Switches | Sorter ! Sorter controller PCB | {Microprocessor — | | | ADF ADF controller PCB Figure 3-2 COPYRIGHT © 1992 CANON INC. : CANON NP-1550 REV. JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) EIN OPERATIONS AND T1M NC EEE О C. Inputs to DC Controller - 1. Inputs to DC Controller (1/2) Multiteeder paper sensor Pre-registration paper sensor Scanner home position sensor Lens home position sensor Delivery paper sensor Cassette paper sensor Q Q Q3 Q4 Q5 an DC controller PCB 5V J24-1 J312-6 5 5 when paper 1s over QT, "1". 7 - MFPD . (light-blocking plate is at Q1) -3 -4 5V J23-1 J312-3 4 2 2 P4 when paper is at Q2, '1'. 3 4 PD (hght-blocking plate is at Q2} 5V J35-1 J317-5 A 2 4 | scHP when scanner is at home position, '1'. 4 3 (light-blocking plate is at Q3) 5V J33-1 J317-8 À -2 7 | LHP when lens is at home position, '1'. 3 -6 (light-blocking plate is at Q4) sv 443-1 J313-5 -3 -3 FDPZ when paper is at Q5, '0'. 2 4 | (light-blocking plate is not at Q5) sv J26-1 J303-7 2 -6 CPEP when paper is In cassette, 1, 3 5 {(hght-blocking plate is at Q11) Figure 3-3 COPYRIGHT © 1992 CANON INC. CANON NP-1550 REVO JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) OPERATIONS AND TIMING Will; 2. Inputs to DC Controller (2/2) DC controller PCB COPYRIGHT © 1332 CANON INC. AE 24V J701-4 J317-12 24V > 10) x See p.3-25 ÀE sensor 4 - 8 P AEGIN -3 -11 5V 51 | po __ —— J39-3 J303-3 | 4 | 2 when black toner in black developing Black toner 2 BTEP assembly is below specific level, '0". -4 level sensor | 0 4 CTD when color developing assembly is set, '1'. 1 4 | rn НОЕ 77 TH1(NTC1) J317-2 THI Thermistor Vw — The voltage lowers as the fixing heater 1 temperature rises. CST(SWS3) 3 E | J28- J310-2 ~O———+ J28-3 CSZ1 - -3 [00 1-4 — | csze Cassette size | | _ -4 Reads the cassette size; see p.3-32 sensor | оо t > Csz3 | К, - оо © >] 0574 l I 4 у j 0720 oscillation signal SW4 oo 27 3127 ROC when right door is closed, '0". Right door 1 -8 switch 77 Control panel Figure 3-4 CANON NP-1550 REV. SEPT 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-5 EM OPERATIONS AND TIMING D. DC Controller Outputs 1. DC Controller Out Puts (1/3) QR DSW Main motor DC controller PCB 1 9306! 3 MMD when "1" — main motor ON 21 HTRD When "1" fixing roller 1 ] heater ON Fixing rolier heater J4 J106) | -31 ! E 24V |) | E A ACOFF When "0" — AC driver OFF Thermo-switch J107-2-1 fo — a ——— 4 -1 61 | 9601 -1) || -2 | -4 -3 Scanning lamp LAON Lamp regulator, 5 Cm) N J602 À = A LIC See page 3-20 FUZ, -31 3 -4 LAT 4 —— LIGHT | 2 . -5 Lena 7 = Scanner motor Ox => See page 3-16 Figure 3-5 COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV. SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) E OPERATIONS AND TIMING SE 2. DC Controller Out Puts (2/3) Pick-up clutch solenoid DC controller PCB when '0', SL1. ON. when '0', SL 2 ON. when '0', SL3 ON. when '0', SL4 ON. when '0', CL1 ON. when '0', CL2 ON. 24V J308-5 SL 6 | —_ PUSD Lens solenoid 24V J304-1 À -2 — | Ske LNSD Multifeeder solenoid 24V J312-11 1 A -12 | —— | SL3 MFSD Blank solenoid 24V J308-7 4 SL4 -8 | ——=- | BLSD Registration roller clutch | 24\ | J308-3 A CL1 ) 4 RGCD Multifeeder clutch DAV J312-9 ; -10]| CL2 | MFCD Figure 3-6 ‘COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-7 UN OPERATIONS AND TIMING 3. DC Controller Out Puts (3/3) DC controller PCB 24V J309-1 A Scanner cooling fan ([ FMI ) 5 | FM1D When "0" — FM1 ON J311-17 ¿28 Exhaust fan FM2 | 3 |FM2D When "0" + FM2 ON J313-6| 424 Feeder fan - FM3D When "0" — FM3 ON Pre-exposure lamps J731 J308 POT 1-2 11 4 24V | | | | | | | AA 1 1 -2 DEYD My | WA, PEXP When "0" + Pre-exposure lamps ON | _3 J313-2 4 24V Total counter CNT 1 sor TONTD — when "0" + Total counter operates | (only for 100V copier when making i black and white copy) J315-4 § ov cov J314-13 CCNTD When "0" — operates I card uni LV. 14 Control card unit (C C1) He 3 CCNNT — when "0" + card sensed HVT К See page 3-21 | Figure 3-7 COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV: SEPT 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) E. Basic Sequence of Operations (Direct, Continuous Copying (2 sheets)) | WMUPR POWER SWITCH 170% |180% COPY START key (1 (160°C) SCRV SCRV Main motor Primary / transfer Scanner is set HOME position Forward |Reverse Scanner movement * Numbers in parentheses apply to when the CT unit is used. E OPERATIONS AND TIMING EN Figure 3-8 Period Purpose Remarks WMUP From switch on until the | Allows time for fixing Warm-up time varies (Warm-Up) fixing roller temperature | roller to warm up with fixing roller reaches 170°C for the temperature at power black developer or ON. When the COPY 150°C for the CT unit. START key is lighting (About 75 seconds at an green. ambient temperature of 20°C) WMUPR Until the fixing roller Keeps fixing roller tem- | + After the WMUPR pe- (Warm-Up temperature reaches perature uniform riod ends, the rotation) 170° to 180°C for the READY/WAIT indica- black developer or 150° tor changes from to 160°C for the CT orange to green. unit * Even when the fixing roller has warmed up, it rotates for at least 4.2 seconds. INTR About 2.2seconds after | Stabilizes drum sen- A PAPER FEED signal is (INITIAL COPY START key is sitivity to prepare for generated to feed first — rotation) pressed copying sheet of copy paper. Note: AE mode: About 3.2 seconds Non-AE mode: About 2.2 seconds COPYRIGHT © 1392 CANON INC. Table 3-1 (a) ! CANON NP-1550 REV.1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) EN OPERATIONS AND TIMING EE Period Purpose | Remarks AER (AE rotation) From when the scanner moves forward about 70 mm from the end of the image until it returns to its home position. Move the scanner forward about 70 mm from the end of the image and measure the document density. In the non-AE mode, the scanner does not move forward or in reverse. * A REGISTRATION sig- SCFW When the scanneris | Scanning lamp illumi- (Scanner moving forward nates original, and ref- nal is generated, and Forward) * Travel distance lected optical image is copy paper is fed to changes with copy transmitted to photo- transfer area. paper size. sensitive drum through | - À PAPER FEED signal | mirrors and lens array. is generated to feed | next sheet of copy paper. SCRV While the scanner is Scanner is moved back (Scanner moving in reverse to HOME position to pre- reverse) * The speed of the re- | pare for next copy verse movement is 2.5 times that of the forward movement. LSTR Untill the main motor ‘Ensures full ejection of (LAST rotation) stop after SCRV for last | last copy copy ends | STBY | Waits until COPY START (STANDBY) key is pressed Table 3-1 (b) COPYRIGHT © 1992 CANON INC. CANON NP-1550 REVO JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) Il. EXPOSURE SYSTEM A. Changing the Reproduction Ratio The reproduction ratio across the drum is varied by changing the position of the lens. It is moved by the lens drive system. The reproduction ratio around the drum is varied by changing the speed of the ‘scanner. Figure 3-9 shows how the position of the lens is varied to change the reproduction ratio across the drum. F VS repucmon fe fer ENLARGEMENTÍ JT Fe F2 VT] Figure 3-9 The scanner drive system changes the reproduction ratio around the drum by varying the speed at which mirror 1 moves relative to the peripheral speed of the drum. (The scanner is mirror 1 plus the scanning lamp.) The mirror speed is faster than the drum peripheral speed for REDUCTION and slower for ENLARGEMENT. Mote: rs COPYRIGHT © 1992 CANON INC. E OPERATIONS AND TIMING MI B. Lens Drive System 1. Outline The lens is moved by the scanner motor о (M2). Normally, the coupling gear is in its upper position, and connects the scanner motor to the scanner drive capstan. To move the lens, the lens solenoid (SL2) goes ON, causing the coupling gear to disengage from the scanner capstan gear and engage with the lens capstan gear. The lens is a "floating | element" type. In operation, the relative . position of lens elements (individual lenses) changes, and the focal length changes as a result, but the changes are to optimize lens sharpness for each reproduction ratio, not to make the lens function as a zoom lens. (The lens should not be dismantled.) When the scanner motor rotates (CW), the lens will be moved to the left (for ENLARGEMENT) by the capstan and cable. When the cassette size is changed or when the copier is in the REDUCE mode, the blank exposure shutter moves in relation to the distance over which the lens travels, thereby blanking out the width corresponding : to the reproduction ratio; see p. 3-28. | The DC controller indicates 'E210' on the control panel in response to an error in the lens drive system. CANON NP-1550 REVO JAN. 1992 PRINTED iN JAPAN (IMPRIME AU JAPON) 3-11 ll OPERATIONS AND TIMING LENS SOLENOID DRIVE command (LNSD) Coupling gear (> Scanner drive capstan Lens drive cable ENLARGEMENT direction signal {LHP) LENS HOME POSITION DC controller PCB | Figure 3-10 COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV.O JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) HA OPE RATIONS AND TIMING Wl — 2. Basic lens Drive System Operation (change of reproduction ratio) POWER SWITCH , COPY START key ON 4 — + — WMUP. Scanner home position (Q3) signal O @ Reverse Scanner motor (M2) TUN, Scanner movement Forward — Lens solenoid (SL2 Movement of lens @ © Lens home position (Q4) signal tou ти < (CCW rotation .3)ENLARGEMENT direction (2)CW rotation @ REDUCTION : direction (5) Blanking by CASSETTE SIZE Figure 3-11 When the casette size is changed or: . the cassette size and the reproduction ratio. when the copier is in the ZOOM mode, the - This operation is executed also when the lens first returns to the home position before ZOOM mode is switched to the DIRECT moving to the position that corresponds to mode. COPYRIGHT © 1992 CANONINC. © + CANON NP-1550 REV SEPT 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-13 Ell OPERATIONS AND TIMING I C. Scanner Drive System 1. Qutline The scanner is driven by the scanner motor (M2). The direction of rotation of the scanner motor determines whether the scanner moves forward or backward. The forward speed of the scanner motor is continuously variable to produce the required reproduction ratio. The reverse Mirror 2 mount Mirror 1 mount IN Su м? Forward Scanner motor (M2) Connecting gear 2 ‚speed is fixed regardless of the reproduction ratio (2.5 times the forward speed for DIRECT copying). The distance that the scanner moves ‘varies to suit the size of copy paper and the reproduction ratio. The control panel displays 'E202' in response to an error in the scanner motor (M2) or the scanner home position sensor (Q3). Scanner home position sensor (Q3) Lens gear * Og / Solenoid "OFF" Sy e Scanner home position signal (SCHP) DC controller Figure 3-12 3-14 COPYRIGHT © 1382 CANON INC. CANON, NP-1550 REV. SEPT, 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) ZA OPERATIONS AND TIMING ER 2. Relation Between Scanner Sensor - and Signals Do lana ' Scanner Scanner Signal Meaning sensor name Forward | Reverse | Scanner home | | * Grid bias ON position sensor (Q3) SCHP hE * After 0.1 seconds, scanner stops A advancing Table 3-2 3. Basic Scanner Operation POWER switch ON. COPY START key ON * WMUP INTR SCFW Scanner home position sensor - Pre-registration paper sensor Forward Scanner movement | Figure 3-13 COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV! SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-15 ERE OPERATIONS AND T1811 G: I 4. Scanner Motor Drive System Operation a. Clockwise rotation The scanner motor driver outputs pulses, - and the motor rotates CW. This moves the lens in the direction for REDUCTION, and the scanner moves forward. For REDUCTION copying, the motor speed increases to move the scanner faster (forward). b. Counterclockwise rotation The scanner motor is driven CCW by pulses of phase relationship opposite to that used to drive it CW. This moves the lens in the direction for ENLARGEMENT, and moves the scanner in reverse. DC controller PCB 36V Motor power supply ! 1303 0308 A J302-5 COMA -4 ‘ I A -6 _ 4 5 Ф D Scanner motor Output shaft | É ® = i o (M2) © ‘ a © © = +— o = B J302-2 | ' 7 COMB 1 B -3 | Figure 3-14 COPYRIGHT © 1982 CANON INC. CANON NP-1550 REVO JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) be TTT r E A OPERATIONS AND TIMING IE ` 5. Scanner Movement for Two-page Separation Mode (copy count "2") Doc. LE. Doc. LE. Doc. LE. Doc. LE. Doc. LE. Doc. L.E. (1st page) (1stpage) (1stpage) (2st page) (1st page) (2st page) INTR SCRVI; SCRVI SCFW1 SCFW1 I Scanner home sensor SCANNER FORW command SCANNER REVERSE command SCRV2 Г Ш SCRV2 STBY SCFW2 в FH Forward A orwarde-ba-el4— Forward —|—-— Foward———-— Reverse Reverse Reversa Reverse Figure 3-15 Timing of operations |,II, and Ill shown in figure 3-15 is with reference to the leading edge of the first page of the document (fall of Q3 signal). | [: The distance traveled by the scanner from the leading edge of the original is determined by the reproduction ratio and the copy paper size, just as for a normal copy. Il: This is roughly the same as |. If the forward distance traveled by the scanner is greater than 210 mm (220V, or 240V copier) the DC controller will judge that 210 mm is the leading edge of the original. If the distance that the scanner moves forward is less than 210 mm, the point at which the scanner reverses in | will be the leading edge of the second page of the document. llI:Same as |. * COPYRIGHT O 1992 CANONINC. + CANON NP-1550 REV.1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-17 EI OPERATIONS AND TIMING SE ll. IMAGE FORMATION . Scanning lamp control system SYSTEM | * Primary /transfer corona current and grid bias voltage control system Controlling developing bias A. Outline * Document density measurement system - Developing assembly/Drum cleaner The basic structure of the image forma- « Blanking tion system is as shown below. 7 7 7 7 | >. | ! Scanning lamp dy Lens XX TT = - rr 7 —— Pre-exposure lamps [~ — ——— -———- | и AE sensor Р Р Г == | 4 « 7 и x { EN + Blank exposu 2 shutter . o 1 | ] 2 | © Lamp © regulator E | o © | Ш т = ON Ш o < o When shorted, 5 a Li signal sent to Ss < | 4 indicate black 8 < „| й = < © developing E > LU > > ® Sl SE = 5 re assembly. a ФЕ = 3 e © = 58 N q > = | . 2 e E | |8 © & LE O >< CO = © © | I i | > ® © a el O D o о — le у Ша. A o © | 2 58 а © Se © > GRID ON signal (GRDON) © 55 Ww = Е HVTON command (HVTON) AC BIAS ON command High-voitage (ACBON) transformer DC BIAS control command (HVT) (DCBC) DC controller GRID BIAS control signal (GRBC) CT-UNIT DETECTION signal (CTD) Figure 3-16 > 3-18 COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV.1 SEPT. 1932 PRINTED IN JAPAN (IMPRIME AU JAPON) EA OPERATIONS AND TIMING EEE B. Basic Operation of Image Formation System (black developing assembly, 2 copies) COPY START key INTR SCFW. Main motor (M1) / Forward [Backward Scanner movement Scanner home position Primary / transfer corona Grid bias ON /OFF bias DC Developing bias AC component LIGHT INTENSITY CONTROL command . When CT unit is used. Figure 3-17 When a color developing (CT) unit is used, the AC component of the bias operates when the main motor (M1) is operating. . COPYRIGHT © 1992 CANON INC. ' CANON NP-1550 REV.1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) | 3-19 ES OPERATIONS AND TIMING НН C. Controlling the Scanning 1. Lamp Outline The scanning lamp (LA1) is controlled by the DC controller PCB; see Figure 3-18. Specifically, the DC controller « turns the scanning lamp ON and OFF. - controls the intensity of the scanning lamp. 2. Mechanism a. Turning the Scanning Lamp ON and OFF The microprocessor (Q303) on the DC controller PCB controls the lamp regulator. The scanning lamp goes ON when the scanning LAMP ON command (LAON) is "1", and it goes OFF when the signal is "0". Controlling the Intensity of the Scanning Lamp The intensity of the scanning lamp is switched between when the black developing assembly is used and when the CT unit is used. When the CT unit is used, the LIGHT INTENSITY CONTROL command (LIC) goes '0' to raise the lamp voltage by about 3.5 V higher than when the black developing assembly is used. During AE exposure, however, the voltage (70 V) applied to the scanning lamp remains the same. The NP-1550 adjusts the copy density using its development bias; see p. 3-22. . Error Protection The: condition of the scanning lamp is ~ monitored using the LIGHT signal (LGHT). If the LIGHT signal (LIGHT) is received by the DC controller for about 20 sec, the error detection circuit generates the AC SHUTOFF signal (ACOFF) to force the relay (S105) on the AC driver/DC power supply, PCB to go OFF, thereby cutting AC power supply (P. 3-39). In this case E220 error is displayed. CT unit Power supply voltage detection circuit J601 Relay -1 [gy] S105 ° a e 3€ © -4 8 | | АСОРЕ | 0 © = 4305 4603 Lamp ON © 5 detection 5 LGHT circuit ey © С J-305J603 intensity = 2 -5 switching Phase | | © 5 ПС circuit control D Bo 3 | |28 = SC | |J305 J603 co F7 -3 4 Switching = LAON circuit Triac-triggering circuit DC controller PCB Lamp regulator Figure 3-18 3-20 COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV.1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) TT x D. Primary/Transfer Corona Current and Grid Bias Voltage Control System 1. Outline | | The circuit shown in Figure 3-17 conntrols the primary/transfer coronal current and the bias voltage of the grid of the primary corona. Main functions are as follows. a. Switching primary transfer corona current ON/OFF b. Maintaining primary/transfer corona current constant ¢. Switching primary corona grid bias voltage d. Switching primary. corona grid bias ON/OFF In order to eliminate the effect of changes in atmospheric conditions on the effective- ness of the corona discharge, the current to the primary corona wire is maintained | constant. The primary corona and transfer corona current are switched ON and OFF by the HVT ON command (HVTON). — The grid bias voltage is switched by the ‘GRID ON signal (GRDON). DC controller PCB E OPERATIONS AND TIMINGUES 2. Switching Primary/Transter Corona Current ON/OFF a. When HVTON = 1 Differential amplifier goes OFF. | L Variable pulse width oscillator goes OFF. High-voltage transformer goes OFF. b. When HVTON = 0 Differential amplifier goes ON. Variable pulse width oscillator goes ON. . High-voltage transformer goes ON. 3. Maintaining Primary/Transfer Corona Current Constant If the primary corona current is greater than the correct value due to changes in the environment, the level (analog) of the feedback signal to the differential amplifier circuit will increase and the output trom the differential amplifier circuit will fall. Asa result, the primary/transfer coronal current will fall. Similarly, if the primary corona current is too low, it will be increased. If the output side of the high-voitage transformer supplying the primary corona assembly should be overloaded, the current will be limited to a certain maximum. High-voltage transformer (HVT) 24V В - Primary corona [р-не 1 assembly | Differential Variabl | T3d 1 | 3 —e | HVTON amplifier pulse © arcu | т v= Grid Co. {> width | + | High--voitage | | | oscillator transiormer $ | ' Fhotosensitive | | T3 | rum | | i _ Limiter 2 circuit Ls] 8 pH E Transfer corona = TT | assembly 5 WT 1 = 21.5V 24V Ti Q5 | LL T4 RDON | | GROON L7 0 “+ Comparator Figure 3-19 . COPYRIGHT © 1992 CANON INC. - CANON NP-1550 REV.1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 3 - 21 HEN OPERATIONS AND TIMING ETT 4. Controlling Grid Bias Voltage a. During scanning, the DC controller PCB outputs GRDON = "0", Q7 goes ON and the comparator output is "L”. Q6 goes OFF. Current does not flow into transformer T4 and Q5 goes ON. Le Bias IS applied to the grid. The surface of the drum 1s charged. The voltage applied to the grid is fed back to the comparator which functions to maintain the grid voltage constant. b. When scanning is not taking place, the DC controller PCB outputs GRDON = "rr Lar goes OFF and comparator circuit output is "H". Q6 goes ON and current flows into T4. L. Bias is not applied to the grid. Under the above conditions, the surface of the drum is not charged, hence toner does not adhete to it (blanking). The timing at which the grid bias is . switched may be varied using 'C3' or '£B' in the service mode (leading edge non-image width adjustment). 3-22 COPYRIGHT © 1992 CANON INC. E. Controlling Developing Bias 1. Outline | The circuit shown in Figure 3-18 controls the developing bias. Its main functions are as follows. a. Switching AC component of the developing bias ON/OFF. | b. Regulating voltage of the DC component of the developing bias. The copy density can be controlled by varying the voltage of the developing bias to suit the following variables. a. Settings of COPY DENSITY lever and recalibration dial b. AE sensor output c. Type of developing assembly When there is a black developing assembly in the copier, J303-1 and J303-4 are connected electrically to inform the copier that a black developing assembly is in place. The photosensitive drum gradually deteriorates with use, causing the potential (VL) of light areas of the drum to increase, so that copy. density is not correct for a given setting of the copy density lever. To compensate for this, a COPY DENSITY "knob, which can be turned to raise the DC bias by exactly the increase in VL, and thus produce clear copies again. 2. Operation a. Switching AC component of the developing bias ON/OFF The square wave generator operates continuously when the copier is switched ON. a) When ACBON = 1 Lac bias switch circuit goes ON. | Output from the square wave generator is cut off. So AC bias is not supplied to the developing cylinder. CANON NP-1550 REV.1 SEPT, 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) „> Es OPERATIONS AND TIMING IE” b) When ACBON = 0 | The AC bias switch circuit goes OFF. So the output of the square wave oscillator goes to the T1 drive circuit. This causes the ‘AC high-voltage transformer to generate a 1300VAC AC bias, which is supplied to the developing cylinder. Also, the output of the AC high-voltage transformer is rectified and supplied to the static charge eliminator (approx. 3. 2 kV). b. Controlling DC bias The differential amplifier of Figure 3-21 operates when DCBC is 16V or below. (The range of DCBC (analog) is 6 to 16V, as set by the copy density cursor or the AE system.) | Differential amplifier goes ON. Le Variable pulse-width oscillator goes ON. DC high-voltage transformer goes ON. The DC bias is applied to the developing cylinder. DCBC EV to16V DC component of -500V to -OV developing bias DC controller PCB The copy density knob changes the DC component of the developing bias as shown in Figure 3-20. COPY DENSITY lever scale « (5) L 1 À D -100 4 -200 7 y -300 - -400 - | Uy -500 + U Y DC bias Figure 3-20 Changes in Development Bias (DC component) by COPY DENSITY knob High-voltage transformer unit (HVT) i tH AE sensor Chott | Square Ë | ACBON AC bias T1 drive 'Swilching circuit Co ; COPY DENSITY | knob Microprocessor circuit SAV I ny Sw AC high-voltage; transiormer TT - | Pholosensitiva 6—1 drum DCBC | ] D/A > — — —<« converter amplifier 1 1 1 1 | avid DENSITY] — <> Dtterantral! | | T2 dnve Vanable circu 1 Developing J eylindar — Rechitier Ipulse-width Ге oscillaior = ПЕР | Black | | developing a( ‘ 1 J assembly CT unit is used. | Q Г acces AS (A) 15 not shorted when + | | DC high-voltage | transformer T2 1 Static charge elminator _, Figure 3-21 COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-23 lll OPERATIONS AND ре —Ñl —r3zr$———];;L;—Éí——;;—;— 3. Developing Bias Operation COPY START key WMUPR ON 'SCRV SCRV N, WMUP | ISTBY| INTR scrw | | SCFW | LsTRAISTBYS AER Main motor (Mt) Scanner home position sensor (Q3) signal AC BIAS ON command (ACBON) DC BIAS CONTROL command (DCBC) 7zZD za Figure 3-22 ин 4 * The value of the DC BIAS CONTROL command and the DC bias are determined by (1) the setting of the COPY DENSITY lever and COPY DENSITY knob, (2) the AE sensor output, and (3) the type of developing assembly installed. ** The DC bias used at times other than during scanning depends on the type of developing assembly installed. Black developing assembly: Approx. -320V CT unit: Approx. -220V A И NE i Pa 1 € ‘developing. Dia main motor is : of ох we; 3 e AE Нами’ 3-24 COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV SEPT 1982 PRINTED IN JAPAN (IMPRIME AU JAPON) 7 > ET OPERATIONS AND TIMING на F. Document Density Measurement System 1. Outline | There is an automatic density adjustment (AE) system which adjusts the DC component of the developing bias to suit the density of the original. If the density of the original is more or less uniform, the AE function varies the DC component of the developing bias to suit the density of the original, so that copies of the correct density will be made. 2. Operation The scanner moves, forward approximately 70mm past the leading edge of the original and stops momentarily. The scanning lamp goes ON for approximately one second, the image density is read by the AE sensor, and the sensor output is interpreted by the DC controller. The DC controller then adjusts the DC component of the developing bias accordingly. Г 1[Арргох. 65mm 1 Approx. 30mm Approx. | 28mm LT Note: 3. Reading the Output of the AE Sensor The AE sensor consists of a photodiode (Q702) and an operational amplifier (Q701). If the strength of light striking the photodiode is high, the output voltage (AE) of the amplifier will be small. If the amount of light . is small, the output voltage will be large. The DC controller reads the output at a certain time after the zero-cross signal - (ZXDP) is received from the DC power supply. The data representing the adjusted AE reference/slope values are written to EEPROM when '¿0' or Er is used in the. service mode. 70mm For reference: B6 size Approx. 1 Approx. iti Approx. A. A is the position of the AE sensor 25mm Figure 3-23 POT a Mn nn = - [ | AC driver | A Wy | Q315 | ZXDP DC power | 24V | EEP = | supply | + | ROM] 8 PCB | ^^ ; - | АЕ 9 | 16702 0701 1434-2 J317-10 S | 5 | = e | ¡ — AEGIN Td 1J34-1 3317-97 "VR301 À | | o a ! _ AE sensor PCB DC controller PCB Figure 3-24 COPYRIGHT © 1992 CANON INC. - CANON NP-1550 REVO JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) ‚3-25 BES OPERATIONS AND TIMING ET 4. Adjustment | Make the following adjustments when the AE sensor or the DC controller PCB has been replaced. | 1) Remove the potentiometer cover at the back of the left cover. 2) Set the power switch ON. * Wait until the WAIT period has ended. 3) Place an NB-3 or NA-2 test sheet on the copyboard, and lower the copyboard cover. 4) Press switch SW 300 on the DC controller PCB. | » "0" will appear on the COPY COUNT/ RATIO indicator on the control panel. * |f "0” does not appear, press the "0" number key on the control panel so that "0" appears. 5) Press the SORT/GROUP key on the control panel. * The scanner will move forward to the AE measuring position, then the scanning lamp will go ON. (Note) 6) Adjust VR 301 on the DC controller so that "22" appears on the COPY COUNT/ RATIO indicator. For reference: À = “a 5 7.71 , © / 8 o © / / ST = + 1 VR301 I 1 Test sheet Sheet of newspaper Figure 3-25 7) Press the SORT/GROUP key. * The scanning lamp will go OFF, and the scanner will return to the HOME position. 8) Remove the test sheet, place a sheet of newspaper on the copyboard, and lower the copyboard cover. 9) Press the SORT/GROUP key. * The copier will perform the same operations as described in step 5). 3-26 COPYRIGHT © 1992 CANON INC. «= Document density 10) Make a note of the numerical value displayed on the COPY COUNT/RATIO indicator. 11) Press the SORT/GROUP key. « "0" will appear on the COPY COUNT/ RATIO indicator. | 12) Press the "1" number key. —l © Copy density + "1" will appear on the COPY COUNT/ RATIO indicator. Enter the value recorded in step 10) using the NUMERIC keypad. : 4 =~ ~J 1 T + » Document density ¡Test sheet Sheet of newspaper =>: when the setting is lowered. =p : when the setting is raised. Figure 3-26 CANON NP-1550 REV1 SEPT. 1392 PRINTED IN JAPAN (IMPRIME AU JAPON) и DAN OPERATIONS AND TIMING I G. Developing Assembly/ Drum Cleaner 1. Outlines The paddle inside the drum cleaning unit and also the developing cylinder are rotated by the main motor. The amount of toner in the developing assembly is sensed by the black toner level sensor (TS1). | When the amount of toner falls below the required quantity, the ADD TONER indicator on the control panel will flash. When the toner in the CT unit is used up, the entire CT unit should be replaced. The toner collected by the cleaning blade is stored in the drum cleaning unit. The developing assembly is pressed against the drum by a cam that presses against the developing assembly rail. (The cam is operated by the developing assembly release lever.) 2. Remaining Toner Sensor The black developing assembly has a piezoelectric type sensor (TS1) which senses if the toner remaining in the hopper of the developing assembly is above or below the required level. . When the amount of toner in the hopper is sufficient, the sensor output is "1". When it is below the specified level, the output is "o". The DC controller checks for 5 seconds after copying is completed if the TONER EMPTY signal (TEP) is being outputted. № the signal is outputted continuously for 5 seconds, it is regarded as. "TONER OUT- First time". If another TONER EMPTY signal is received in the same way after the next copying operation is completed, it is regarded as "TONER OUT-Second time". and the DC controller makes the ADD | TONER indicator flash. oo The CT unit for this copier does not have a remaining toner sensor or waste toner. Sensor. 3. Torque Limiter There is a torque limiter in the drive train . between the main motor and the drum to stop the drum in response to a jam in the drum cleaner. Mi Main motor Drum cleaning unit Torque Cleani NE saning blade ' limiter Black developing Pressed <=) Released / - assembly Black toner level sensor (TS1) photosensiive + | Developing assembly drum + positioning cam | ~~ Stirrer ‘Paddle DC controller \ Developing cylinder Developing assembly rail uni TONER EMPTY signal ping y rail unit (ТЕР) Figure 3-27 COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV: SEPT 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) ENS OPERATIONS AND TIMING E H. Blanking 1. Outline The area of the drum between the trailing edge of one copy and the leading edge of the next would normally act as an all black area and attract toner if a preventive measure were not taken. This measure is to switch the primary corona OFF and the primary corona assembly grid wire bias ON (There is no blank exposure; see page 3- 22.) When the copy (cassette) size is a non- default size or when the copier is in the REDUCE mode, the light from the pre- exposure lamp is directed to the photosensitive drum by way of the reflecting plate to prevent adhesion of toner; the blank exposure shutter is moved to open the exposure slit making use of the movement of the lens. Reflector Mun \ Exposure window nba J) | NÖ o (Front) 2. Movement of the Blank Exposure Mechanism a. When the copier is switched ON, the lens first moves in the direction of. enlargement and then returns to the home position." Next, the lens moves in the direction of reduction for blank exposure up to a point that corresponds to the cassette size. At the time, the blank solenoid goes ON, and the blank exposure shutter moves in the direction of the arrow by the force of the spring. | Blank exposure shutter J ref] | ES Bank | Spring [on solenoid (SLa) Figure 3-29 Front Reflector Figure 3-28 3-28 COPYRIGHT © 1992 CANON INC, CANON NP-1550 REVO JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) savin Qu un as” | Nom SREY mm Gad a“ NI | ! - - mm E COPYRIGHT © 1992 CANON INC. b: The blank exposure shutter is moved by the cam attached to the bottom of the lens when the lens moves to the blank exposure position, which corresponds to the cassette size. The blank solenoid (SL4) goes OFF as soon as the blank exposure shutter has moved to a cut-out to fix the shutter in position; cut-offs are provided for each — cassette size. DIRECT and ENLARGE copies are made with the mechanism in this position. \ A A Cut-offs Figure 3-30 с. When the REDUCE mode is selected, the lens first returns to the home position and then moves to a position that corresponds to the selected reduction ratio. At the time, the blank exposure shutter is moved over a distance corresponding to the selected reduction ratio by the cam attached to the bottom of the lens to execute blank exposure. SL4 Figure 3-31 CANON NP-1550 REV.O JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) —_—_—_—_—_—_—_—_—m—_—m—æ—"”""x— OPERATIONS AND TIMING HE ES OPERATIONS AND TIMING I CE IV. PAPER TRANSPORT SYSTEM A. Paper Pick-up Assembly and Feeder 1. Outline When the pick-up clutch solenoid (SL1) engages, main motor (M1) turns the roller, feeding a sheet of copy paper to the registration rollers. The number of rotations of the pick-up roller varies with the length of the copy paper. The copy paper is fed by the registration rollers so that its leading edge is in line with the leading edge of the toner image on the photosensitive drum. It then passes through the transfer, separation, feed, fixing and delivery stages to the copy tray. The copy paper is sensed by paper sensor (Q2 and Q5). If it does not reach or pass the sensors within the specified period, the DC controller PCB judges that a jam has occurred and causes the JAM indicator on the control panel to flash. Cassette paper sensor (Q11) senses whether there is paper in the cassette. If there is :not, the CASSETTE PAPER EMPTY signal (CPEP) becomes "0", causing the ADD PAPER indicator on the control panel to go ON. Pick-up roller TOUS SL 1 Control ring Figure 3-32 (rear) Paper detection signal 2 (PDP2)_ DC controller PCB т o © CO Main moter drive 5 5 5 J KARA 5 ‘© 5 = AC dnver / command (MMD) 5 5 = soo DC power supply © E = cg g a oD ED © © ! “ue т Zo E(x ar © D E 9510 "o PCE 3 à 25ai— 535 eg] 8358 on OC а, =. Dv EEE Lr EE SR Eom om mE mea» om a || || || | > Main m | a | otor À 1 DÍ | Е © | ' | | D i ВО a || || [|] Pick-up | = roller : @ | || || [|] clutch™ uu 2 о || | | || Г] Reaistrati i 9 e egistration me) | Photosensitive drum |] ¡Feed | 1 Q2 © || roller 2 roller и Й I per Fr % Q11 +} Pick-up roller C2) (4 —_— — | || Cassette | | cassette size sensor Г eee eme meme ere me eee eee eee ee a Figure 3-33 COPYRIGHT © 1992 CANON INC, CANON NP-1550 REV SEPT 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) AC TT EE OPERATIONS AND TIMING Hl ` 2. Pick-up and Feeder Operation COPY START key SCRV SCRV INTR Main motor Feeder fan + Scanner home position sensor Pick-up clutch solenoid (SL1) Registration roller clutch (CL1 paper sensor ‘Delivery paper sensor Counter Figure 3-34 COPYRIGHT © 1992 CANON INC. CANON NP-1550 REVO JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-31 BEN OPERATIONS AND TIMING 3. Identifying the Cassette Size The presence/absence of a cassette in the cassette holder and the size thereof are identified by four switches (CST1 through CST4) provided in each cassette holder. Based on the combinations of the switches which have been actuated, the microprocessor recognizes the presence/absence of a cassette as shown in Table 3-3 and, at the same time, determines where to reverse the scanner and how to control the blank shutter. Arrangement Paper size C cn T — CST CST (right) No cassette © - © | © «Ц В5 (182х257) o о | ©! «Що & — < U1 (184 to 190 x 265 to 267) A4 (210x297) B5R (257x182) B4 (257x364) A4R (297x210) A3 (297x420) U3 (190 to 203 x 266 to 268) A5R (210x149) (203 to 220 x 267 to 355) Letter 8.5"x11" (216x279) STMT 5.5"x8.5" (140x216) Legal 8.5"x14" (216x356) Letter R 8.5"x11" (216x279) Ledger R 11"x17" (279x432) 1 ОЙ 1 3-32 COPYRIGHT © 1992 CANON INC. (unit: mm) Table 3-3 0: SW is OFF. 1: SW is ON. CANON NP-1550 REV.0 JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) Main EE OPERATIONS AND TIMING I 4. Pick-Up from Multifeeder The multiteeder pick-up roller is controlled by the main motor (M1). When the multifeeder paper sensor (Q1) identifies copy paper and the COPY START key is pressed, the multifeeder clutch (CL2) goes ON and the pick-up roller starts to rotate to pick up the paper. | When the copy paper reaches the registration roller, the multifeeder clutch (CL2) goes OFF and the pick-up roller stops. At the same time, the multifeeder solenoid (SL3) goes ON to transmit the drive of the main motor (M1) to the cam Pit ne meg «Note: LE IRC ek a En the s service e mode E mechanism, thereby lowering the multifeeder holding tray to prevent dirt on the next copy paper in duplex. The multifeeder solenoid; (SL3) goes OFF : as soon as the first copy paper moves past - the pre-registration paper sensor (Q2); at the time, the multifeeder holding tray returns to the normal pick-up position. / The degree'o £arching. for pick-ups a ‘from the miiltifeeder. may’ be: adjusted ir: DC controller PCB 55 _ 5 o E = D o 0) a EE 55,2 52,2 = Cc gs QT pl ro > seg” cg 5 5 AC Driver ж ЕЕ =5E gg 238% =338 SE =88 SS Tc O [e вю | —— И ни Ш (Clo 82 ‚ = o Main motor i Multifeeder clutch 8 2 > Multifeeder Multifeeder tray paper sensor N G Cam mechanism Muti- y > feeder solenoid! | 1 | | Clutch Figure 3-35 COPYRIGHT © 1882 CANON INC. CANON NP-1550 REV. SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) . Multifeeder BES OPERATIONS AND TIMING (Pick-up) (Holding plate) No Arm used to push down the holding plate. A Cam mechanism и Figure 3-36 : Figure 3-37 ho COPY START key Paper INTR sensor (Q1) Main motor ) Multiteeder cluth Pre-registration paper sensor Multifeeder solenoid (SL3) roller clutch Figure 3-38 3-34 COPYRIGHT © 1992 CANON INC. CANON! NP-1550 REVO JAN. 1992 PRINTED IN'JAPAN (IMPRIME AU JAPON) TT COPYRIGHT © 1992 CANON INC. REE OPERATIONS AND TIMING TE B. Fixing and Paper Delivery Assemblies 1. Outline The upper and lower rollers of the fixing assembly are driven by the main motor (M1). The upper roller is heated by a single heater (H1:900W). When the surface temperature of the roller rises, the resistance of the thermistor (TH) falls, so the voltage of . the signal that it produces FIXING ROLLER SURFACE TEMPERATURE signal (TH1) also falls. Whether the voltage of TH! (analog) is above or below a certain level at a given time determines if the microprocessor of the DC controller makes the HEATER DRIVE command (HTRD)."1" or "0". The NP-1550 is provided with the following three protection mechanisms: Main motor TH 1 « The microprocessor monitors the voltage of TH1 and indicates 'E000' or 'E001' in response to an error, i.e., ACOFF goes '0' to turn the relay (5105) OFF, thereby cutting the power to the fixing heater. « The fixing roller error detection circuit monitors the voltage of TH1 and, when it drops below 0.9V (equivalent of 215°C), turns HTRD OFF. » The thermo switch (TS1) goes OFF when the temperature of its inside rises to 230°C to cut off the power to the fixing heater. — Delivery rollers £ + Lower fixing roller Thermo-switch TS1 (F1) 230% Microprocessor AAA yw AC driver PCB 1306- ACOFF | _ DC controller PCB Figure 3-39 CANON NP-1550 REV{ SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-35 BES OPERATIONS AND TIMING EEE 2. Operation of Fixing Assembly Temperature Control System Power switch 170°C 180°C COPY START key (150%) (160%) "SCRV | SCRV \ ! \ N | scFrW | * |LSTR| STBY Ç Main motor (M1); Scanner cooling fan (FM1) WMUP |wuuPe| STBY_|S 5! SCFW Exhaust fan (FM2) Fixing roller heater (H1) WAIT indicator (COPY START key indicator}p, br) i 190°CH 180°CH 170°C1 160°C 150% + MAD и Уд When CT, unit is used “и -—r ey = A Vil NX i Numbers in parentheses | apply to when the CT unit |6 used. a NN A INIA - Note; em 51 When, e e rarest mi 1078 “press: on 4 Figure 3-40 “> a COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV. SEPT, 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) Cs OPERATIONS AND TIMING UNS C. Jam Detection The copier has two sensors to sense whether copy paper is being fed normaily. * Pre-registration paper sensor (Q2) Delivery paper sensor (Q5) Paper jams can be identified by the microprocessor by reading signals from the sensors at predetermined times to check if paper is at or not at a sensor at that time, and thus identity if the paper is moving through the copier correctly. If a jam occurs, the copier memorizes the number of copies that have not yet been made and also the copier settings. This information is stored in the copier, even if the power is cut off by opening the front door in order to reset the copier. a. Multifeeder COPY START key ON INTR Multifeeder clutch JAM check Pre-registration paper sensor (Q2) Main motor Normal The microprocessor identifies a jam in any of the following four cases. Also, the microprocessor judges that there is a ат! one of the sensors detects paper when the power is switched ON. 1. Pick-up assembly delay jam If the copy paper does not reach the paper sensor of the pick-up assembly within a specified period after paper pick-up-starts, the microprocessor will judge that a pick-up delay jam has occurred, and immediately stop the operation of the copier. Also, the JAM indicator on the control panel will flash. and a segment of the PAPER SELECT/JAM indicator will go ON. JAM indicator flashes SCRV Figure 3-41 (Multifeeder pick-up assembly delay jam) b. Cassette , COPY START key ON INTR clutch solenoid | 1 JAM check Pre-registration paper sensor (Q2) Main motor JAM indicator flashes SCFW SCRV Figure 3-42 (Cassette pick-up assembly delay jam) COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-37 EEROPERATIONS AND TIMING IECUEGENNDN 2. Delivery assembly stationary jam If the copy does not pass the delivery assembly paper sensor within the specified period after the registration roller clutch (CL1) operates, the microprocessor will judge that a delivery unit stationary jam has COPY START key ON INTR roller clutch 1 Jam check sensor Main motor occurred, and immediately; stop the operation ‘of the copier. Also, the JAM indicator on the control panel will flash-and a segment of the PAPER SELECT/JAM indicator will go ON. JAM indicator flashes SCRV Figure 3-43 Delivery assembly stationary jam (A4 size) 3. Delivery assembly delay jam If the copy does not reach the delivery assembly paper sensor within the specified period after the registration roller clutch (CL1) has operated, the microprocessor will judge that a delivery assembly delay jam has COPY START key ON 1 roller clutch Jam check sensor Main motor SCRV occurred, and immediately stop the operation lof the copier. Also, the JAM indicator on the control panel will flash and a segment of the PAPER SELECT/JAM indicator will light. . JAM indicator flashes SCFW SCRV Abnormal Figure 3-44 Delivery assembly stationary jam (A4 size) 3-38 COPYRIGHT © 1992 CANON INC. : CANON NP-1550 REV1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) E OPERATIONS AND TIMING HN V. POWER SU PPLY switch the copier OFF. Note that repeated short-circuiting and A AC Driver DC Power resetting can cause the built-in fuse to blow. Supply о | 1. Outline The ‘AC driver/DC power supply PCB is supplied with AC power when the door switch (SW2) and the power switch (SW1) go ON, | On the other hand the DC power supply supplies the main body with 36 VDC, 24 VDC, and 5 VDC. 36 VDC is used to drive the scanner motor (M2), and 24 VDC is used to drive - fans and solenoids as well as high-voltage transformer (HVT); 5 VDC is used by the sensors and ICs on the DC controller PCB. 2. DC Power Supply Circuit | The AC voitage is lowered to 32 V by the external transformer (T1) and sent to the DC power supply/AC driver PCB. The lowered voltage is then rectified to 36 VDC and converted to 24 VDC and 5 VDC by two regulators. | These regulators serve to prevent | overcurrent and help maintain the output | | voltage against fluctuations in the voltage of | the power supply. ' The DC power supply/AC driver PCB is ‘ equipped with a zero-cross (ZXDP) signal generator circuit; the circuit generates zero- cross signals and sends them to the DC controller for control of the fixing heater temperature and the copying sequence. 'E261' is indicated on the control pane! when an error is identified in the zero-cross (ZXDP) signal. 3. AC Driver Circuit The DC power supply/AC driver PCB has AC driver circuit and, based on the signals from the DC controller PCB, controls the SSRs and relays on the DC power supply/AC driver PCB to drive AC loads. If the DC controller PCB detects an error, the ACOFF signal is generated to turn the relay (S105) on the DC. power supply/AC driver PCB OFF, thereby shutting off the power to the CVR and the fixing heater. When the power is shut off, switch the copier OFF, and identify the cause; then, COPYRIGHT © 1992 CANON INC. © CANON NP-1550 REV SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-39 SEN OPERATIONS AND TIMING EN ____________________________________________ - Main motor * CVR Sorter power; ADF power AC load supply supply (option) (option) + Fixing heater Door - Power switch Circuit breaker switch (sw2) (CB1) (SW1) F101 F use Relay AC drive circuit ($105) 36V Scanner motor E AC OFF | | Transf ransformer |36v Ti ; ; 24V | 24V DC load Reguiator 1 24V — + Regulator 2 sv, HVT L_ Zero-cross (ZXDP) mu 7 24V AE | signal generator sensor + circuit ZERO CROSS (ZXDP) sv Photointerrupter AC driver/DC power suppl y PCB Figure 3-45 COPYRIGHT © 1992 CANON INC, DC controller PCB CANON MP 550 REV.1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) I O PE RATIONS AND TIMING ШВ > VI. SERVICE MODE A. Outline The NP-1550's service mode allows the following: * checking the operation of some switches and LEDs. ‚ = changing data in EEPROM 'B. Using the Service Mode 1) Detach the VR cover from the rear of the left cover. 2) Check that the COPY START key is J glowing green. 3) Press the service switch (SW300) on the DC controller PCB.. 4) Check that ' CO is indicated. 5) Enter the No. of the desired service mode using the NUMERIC keypad on the control panel. * Рог example, the display indicates ' C3 ' in response to a press on 3". 6) Press the SORT/GROUP key. 7) Operate as follows as necessary. < Mode No. EU, eu ‚or KM > A press on the SORT/GROUP key executes the selected mode; a second press stops the execution. < Mode No. CE! through E6 and L‘S > Change the setting using the NUMERIC keypad, and press the SORT/GROUP key; the setting will be stored in EEPROM. < Mode No. C/B > Press the AE key twice, 'and check 'CEE' is indicated on the control panel; | then, press the SORT/GROUP key. 8) Press the service switch (5W300) to leave the service mode. COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV.1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) EE OPERATIONS AND TING Rua a C. Guide to Service Mode Mode N Displ Default R k ode No. isplay Settings emarks Г 7 AE sensor output Use it when adjusting the AE _ reference point/slope; see p. 3-46. E { AE adjustment 25 A higher setting causes copies of newspaper to become lighter; see 3-46. (unit: 0.1V) 0 to 50 | го Leading-edge registration 39 À higher setting delays the | La adjustment _ registration roller ON timing. (registration roller ON (unit: 0.25 mm) timing adjustment) | O to 63 Г 3 Leading-edge nonimage A higher setting increases the leading width adjustment 32 edge non-image width. (grid bias switch timing (unit: 0.25 mm) adjustment) | 0 to 63 Lf Degree of arching A higher setting delays the С (multifeeder pick-up; clutch > multifeeder clutch OFF timing. off timing adjustment) 3 (unit: 0.25 mm) | 0 to 63 COPYRIGHT © 1992 CANON INC, CANON NP-1550 REVO JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) EE OPERATIONS AND TIMING Hl M de N Disol Default R ode No. isplay Settings emarks F7 E Leading edge registration A higher setting advances the Nan adjustment (2nd page in 32 registration roller ON timing. page separation; registration (unit: 0.25 mm) roller ON timing adjustment) 0 to 63 Оу” E Leading edge non-image | A higher setting increases the L width adjustment (2nd page in|. 32 leading edge non-image width. page separation; grid bias | (unit: 0.25 mm) switch timing adjustment) a 0 to 63 ™ 4 Cassette size The size of the cassette is indicated ha ( _ in ‘code in response to the output of | the activated cassette switch; | see Table 3-4. | (af LED ON check (on cotroll La € panel) — Г 5 AE mode setting 4 Selects/Deselects the AE mode at time of power-on: 1, AE ON; 2, AE OFF. 0 or 1 Г & For factory adjustment 0 Do not change the setting; ( | 1.e., keep it '0'. OtoS гл a EEPROM reset Initializes EEPROM on the DC controller PCB. COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV.1 SEPT 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) lll OPERATIONS AND TIMING x=M*iwr« E L———;—;—]-;;;;;;;L;;“T—;—;———]o]éÉL TE Code Cassette size || Code Cassette size 0 No cassette 9 U1 1 B5 10 | U2 2 U3 11 Letter 3 A4 12 STMT-R 4 B5-R 13 Legal 5 B4 44 Letter-R 6 A4-R 15 11 x17 7 A3 16 Multifeed 8 A5-R Table 3-4 Cassette Size Codes COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV.0 JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) Ms OPERATIONS AND TIMING UBB TN D. Adjustment 1. Image leading edge non- reproduced area There is a white strip on the bottom of the copyboard glass in the position shown in the figure below. If bias is being applied to the grid of the primary corona while the scanner is passing the white strip, the leading edge of the copy will be reproduced blank. If the leading edge non-image width is outside the standards, adjust the timing at which the grid bias goes from OFF to ON in the service mode ( 23 ). | White strip Surface of copyboard glass in Le— Approx. 10mm Figure 3-46 The standard image leading edge non- reproduced area on a DIRECT copy of a test sheet is 2.0 =1.5 mm. 2.0+ 1.5mm Figure 3-47 A higher setting ( £3 ) increases the leading edge non-image width; in units of 0.25 mm. COPYRIGHT © 1992 CANONINC. - CANON NP-1550 REV.1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) IN OPERATIONS AND TiMINC II 2. AE adjustment Make the following adjustments when the AE sensor or the DC controller PCB has been replaced. | 1) Remove the potentiometer cover at the back of the left cover. 2) Set the power switch ON. * Wait until the WAIT period has ended. 3) Place an NB-3 or NA-2 test sheet on the copyboard, and lower the copyboard cover. 4) Press switch SW 300 on the DC controller PCB. « " LC " will appear on the COPY COUNT/ RATIO indicator on the control panel. « If " CC " does not appear, press the "0" number key on the control panel so that " LG " appears. 5) Press the SORT/GROUP key on the control panel. | * The scanner will move forward to the AE measuring position, then the scanning lamp will go ON. (Note) 6) Adjust VR301 on the DC controller so that "22" appears on the COPY COUNT/RATIO indicator. For reference: = | un 5 7.71 , D / > / o 7 / 7 O , / ; / 5 - + {7} VR301 t w= Document density 1 Test sheet Sheet of newspaper Figure 3-48 7) Press the SORT/GROUP key. » The scanning lamp will go OFF, and the scanner will return to the HOME position. 3-46 COPYRIGHT © 1992 CANON INC. 8) Remove the test sheet, place a sheet of newspaper on the copyboard, and lower the;copyboard cover. 9) Press the SORT/GROUP key. * The copier will perform the same operations as described in step 5). 10) Make a note of the numerical value displayed on the COPY COUNT/RATIO indicator, 11) Press the SORT/GROUP key. e" CO" will appear on the COPY COUNT/ RATIO indicator. | 12) Press the "1" number key. " E{" will appear on the COPY COUNT/ RATIO indicator. 13)Enter the value recorded in step 10) using the NUMERIC keypad. Copy density Test sheet Sheet of newspaper >: when the setting is lowered. mp : when the setting is raised. | | Figure 3-49 CANON NP-1550 REV SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) | | » Document density A OPERATIONS AND TIMING HE VII. SELF DIAGNOSIS The DC controller PCB has a microprocessor that diagnoses the functions of the copier (particularly the sensors) at appropriate intervals. If this microprocessor detects an abnormality, it will display the type of the abnormality on the indicator on the control panel. The table below shows the various fault codes, their meaning, and the corresponding detection timing. | Example of E000 code indication: E <= 000 light alternately. Code displayed Main cause Fault criteria Thermistor (TH1), Fixing roller heater goog (H1), AC driver/DC power supply PCB, DC controller PCB, operation of thermoswitch + If the temperature of the fixing rollers after 40 seconds is virtually the same as when the copier is turned ON. (This indication does not appear if warm- up | is completed within 30 seconds.) « If the temperature of the fixing roller drops below 100°C for 0.1 seconds or longer after warm-up is completed. ELC {| Defective thermistor (TH1), AC driver LS €) DC power supply PCB, Fixing roller heater (H1),or DC controller PCB If the temperature remains 220°C or higher for 0.1 seconds or longer. E nr Counter, DC controller PCB Raf Fh If the break signal is emitted continuously for 0.1 seconds or more the counter is not being driven. Еее Scanner HOME position sensor (Q3), scanner motor (M2), motor controller PCB, or DC controller PCB 1. If the scanner is not at the HOME position (SCHP = = 0) when the COPY START key is pressed. if the scanner does not return to the HOME position (SCHP remains 0) within 15 seconds (A4 size) after it starts to reverse. | If the scanner is in the HOME position (SCHP = 1) when the COPY START key is pressed. + If the scanner does not leave the HOME position (SCHP remains 1) within 1.5 second after it starts to advance. — + If the scanner does not return to the HOME position (SCHP remains 0) within 1 second after it leaves the HOME position (SCHP = 0). ND EC Ha Lens home position sensor (Q4), or DC controller PCB * If the lens does not return to the HOME position (LHP remains 0) within 2.5 seconds, » if LHP remains 1 for at least 4 seconds Eecu Lamp regulater Lf Scanning lamp At the lamp ON timing, LAON=1 is not true. At the lamp OFF timing, LAON=0 is not true. EP DC controller PCB If the data in EEPROM has been rewritten more than specified. 4 | AC driver/DC power suppiy, DC controller PCB Ech If the mains frequency is out of the allowed range. ADF controller PCB, ADF power supply, or DC controlter PCB ECU if ADF remains O for 12 seconds or longer. Sorter controller PCB or DC controller PCB E500 » If the copier does not communicate with the sorter for at least 12 seconds. » If the SORTER STANDBY signal does not return within 35 seconds after the BCR signal is outputted. COPYRIGHT © 1932 CANON INC. - CANON NP-1550 REV.O JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) ME OPERATIONS AND TIMING SE © executed; the copie Y» be reset X Tono E it. OFF lid ne ÓN This consideration is made to prevent the user from resetting the copier when the fixing assembly has a serious fault (open thermistor or others) that can damage the assembly. Rest the copier as follows if 'ECO00' or 'E001" is indicated: 1) Detach the rear cover 2) Press the service switch (5W300) on the DC controller. 3) Check that 'P' and 'OFF' alternate on the control panel COPY COUNT/RATIO indicator. 4) Switch the copier OFF. 3-48 COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV.i SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) FT |. EXTERNALS A. External Covers (D Copyboard cover © Control panel @ Left cover © Front door (3) Delivery cover (7 Cassette @ Copyboard glass - Figure 4-1 M Right cover @ Rear cover O Rear upper cover 4 Right door Figure 4-2 Detach the covers as necessary when cleaning, checking, or repairing the inside of the machine, covers that can be detached by mere removal of the fixing screws are omitted from the discussions. MECHANICAL SYSTEM ll wen RPL PA NE MSDS mee e MY . i * «>, a, X . : a ° > >. ыы 8 ‘ах; : on © to E a e i 2007 “2 E e e AE) eto] Pa ea” A - деф)” Som Cie ibe Go la: a во + -« Make sure that the: copler's: > Te A ' - [ira ee E , = a. > > e : e * 4 watt au so € EC af e а - wa wo ; ‘closed before det ar de aching. the copybo “glass. Use alcohol when cleaning: the - glass; do not-use Solvent;.or the white. - pole Cat à hy 7 * - = on on fra t > 5 a gi € pen “ 0 ra; - 8 Зо Ё 0 ren ok paint alo the: right edge. ofthe glass. hot + € : : pa "a us 7 E CO e e ot LTT ro 5 МЕРОЙ ок, J PEL Te es ota Ta LTTE | te PO 1 3 ; a > “e E E. i > TL > ‚hr one E TAS e , Lite Dan . Dados e E. 200 © . . a a A > > Eb TA ERE SA 1. Detaching the Inside Cover 1) Remove the two screws that hold the front cover bands in place. 2) Remove the screw, and detach the fixing assembly knob. | 3) Remove the four mounting screws, and detach the inside cover. ' (D Front cover bands (3) Inside cover O Fixing assembly mounting screw knob @ Inside cover: Figure 4-3 COPYRIGHT © 19%2 CANON INC. CANON NP-1550 REVO JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 4-1 EEE MECHANICAL SY STEM [EE ООО 2. Detaching the Right Door 1) Open the right door. 2) Disengage the two hooks. о | Ф oa / TI TTT Mis HL Tr (1) Hook Figure 4-4 3) Detach the right door as if to lift it out of the cut-offs. \ — | E - Ya Aa eu ö @ РР Г ES IIIIIESN || | | | | | 1 / D @ Right door @ Cut-offs Figure 4-5 4-2 COPYRIGHT © 1982 CANON INC. B. Control Panel 1. Detaching the control panel 1) Detach the inside cover. 2) Remove the five screws, and lift the control panel toward the front to detach. ee ЕЕ: Ÿ (2) Control panel (M Screws Figure 4-6 3) Lift the control panel to the front, and turn it over. sy ru a E ate e da o e > В i, у. 7 (1 Control panel Figure 4-7 CANON Np4 550 REV.1 SEPT. 1982 PRINTED IN JAPAN (IMPRIME AU JAPON) À | \ E MECHANICAL SYSTEM EI C. Copyboard Cover 1. Replacing the Copyboard Sheet The copyboard sheet is attached to the copyboard cover using adhesive tape and can be detached by pulling at its corner. After replacement, make sure to even out the sheet for even contact. D. Fans 1. Outline The NP-1550 is equipped with three fans to circulate the air inside the machine, thereby preventing the machine from overheating. Each fan serves the following function. Scanner cooling fan (FM1): cools the scanner feeder fan Exhaust fan (FM2): discharges air to the outside. Feeder fan (FM3): transports copy paper Figure 4-8 COPYRIGHT © 1992 CANON INC. 2. Scanner Cooling Fan (FM1) 1} Detach the rear cover. 2) Cut off the harness band as necessary. 3) Disconnect the connector (J309) from the DC controller PCB. | 4) Remove the three screws, and detach the scanner cooling fan. | M Connector (J309) Y Screws O Scanner cooling fan Figure 4-9 3. Exhaust Fan (FM2) 1) Open the front door, and detach the drum unit. | 2) Detach the rear cover. ) Disconnect the connector (J311), and remove the two screws from the DC controller PCB; then, shift the DC controller PCB. 4) Remove the two screws from the rear of the exhaust fan. ch 1) Screws Figure 4-10 CANON NP-1550 REV.1 SEPT 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 4-3 BES MECHANICAL SYSTEM E 5) Detach the ozone filter and the inside 4. Feeder Fan (FM3) cover; then, lower the feeder assembly. See p.4-17. 6) Hold the exhaust fan assembly on its bottom, and remove the two screws; then, pull the assembly to the front. и (1) Screws (2 Exhaust fan Figure 4-11 4-4 COPYRIGHT © 1992 CANON INC. : CANON NP-1550 REV.) JAN. 1932 PRINTED IN JAPAN {IMPRIME AU JAPON) Es MECHANICAL SYSTEM UE: Il. DRIVE SYSTEM A. Lens Drive Assembly The unit is adjusted at the factory with high precision using special tools. Do not remove parts or loosen screws other than those discussed. - Ей D NE WW fre > Ss СМ Cable fixing CH A) J E x ` 7 | ` | ounting screws X / > | | ® 7 << Mark with scriber. 2 | DZA IÓ ) Pulley mount < Figure 4-12 97 COPYRIGHT © 1992 CANON INC. ' CANON NP-1550 REVO JAN, 1992 PRINTED IN JAPAN (IMPRIME AU JAPON} 4-5 SEN MECHANICAL SYSTEM | 1. Detaching the Lens Cable 1) Detach the copyboard cover, copyboard glass, lens cover, rear cover, and upper rear cover. 2) Remove the three screws shown in Figure 4-13, and detach the upper frame. ————— > (1 Screws Figure 4-13 3) Mark the position of the pulley mount and the cable mount using a scriber. 4) Remove the two screws that hold the pulley mount in place. 5) Detach the cable. 4-6 COPYRIGHT © 1992 CANON INC. 2. Routing the Lens Cable 1) Remove the tow screws that hold the lens pulley mount in place, and detach the lens pulley; see Figure 4-12. @ Screws @ Pulley mount 2 Pulley: Figure 4-14 2) Wind the lens cable around the ¡ens pulley as shown in Figure 4-12; then, fix it using two screws. | 3) Shift :the pulley mount to the position marked with a scriber, and fix it in place using two screws. CANON NP-1550 REV.0 JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) B. Scanner Drive Assembly Pulley 2 ys | N Mark the position. Sc Screw A rews B MECHANICAL SYSTEM WEE CUITE IIED RT e | r 1 Figure 4-15 Scanner Drive Assembly 1. Detaching the Scanner Cable 1) Mark the position of the mount, and loosen screws B (2 pcs.), which hold the mount in place. 2) Loosen screw A (1 pcs.), and detach the scanner cable. COPYRIGHT © 1992 CANON INC. 2. Attaching the Scanner Cable 1) Route the scanner cable as shown in Figure 4-15. | | 2) Position the fixing plate where a mark has, been put using screw À. 3) Tighten screws B. CANON NP-1550 REVO JAN, 1932 PRINTED IN JAPAN (IMPRIME AU JAPON) 4-7 NES MECHANICAL SYSTEM A 3. Adjusting the Mirror Position (optical distance between No. 1 and No. 2 mirrors) Adjust the position of the mirror after attaching the scanner cable. To adjust, relocate the fixing used for the No. 1 mirror mount; loosen the two screws. - Note: — a qd pe tends 10.6 5 © e dn, TOA AS 5 e more : Mc more: € et - 1 «© 5 + bi] hu > 3 ; + 37 ; 1) Draw a line 1 cm from both ends of copy paper (A4 or A3) as shown in Figure 4-16. —> pt em lom—— la — Lines Figure 4-16 2) Make a copy of the sheet on which lines “have been drawn; call the copy obtained this way sheet A. 3) Place a blank sheet of paper on the copyboard, and feed the sheet on which lines were drawn in the manual mode; call the delivered sheet sheet B. E Sheet B will show contraction by heat. 4) Put the left lines on sheet A and sheet B together, and adjust the position of the No. 1 mirror mount so that x and y in Figure 4-17 are identical. 4-8 COPYRIGHT © 1992 CANON INC. =— Sheet A =— Sheet B || — Figure 4-17 х = у correct X>y move the No. 1 mirror mount into the direction of a x <y move the No. 1 mirror mount into UTN the direction of b No. 1 mirror mount Fixing screws (front) a ® — a | = Mirror drive cable (rear) Figure 4-18 CANON NP-1550 REV. JAN. 1892 PRINTED iN JAPAN (IMPRIME AU JAPON) TT 4. Using the Mirror Cleaning Tool Mirror 6 cleaning assembly Mirror cleaning tool Mirror 5 cleaning assembly Figure 4-19 5. Cleaning the No. 5 Mirror 1) Detach the copyboard galss and the lens cover; then, remove the screw, and detach the mirror cleaning tool from the lens mount. 2) Detach the lens cover, and insert the mirror cleaning tool as shown in Figure 4-20. Mirror cleaning tool No. 4 mirror D Figure 4-20 COPYRIGHT © 1992 CANON INC. No. 5 mirror MECHANICAL SYSTEM 3) Push the mirror cleaning tool against the No. 5 mirror as shown in Figure 4-21, and clean the lens by sliding it back and forth. No. 4 mirror Mirror cleaning tool No. 5 mirror Figure 4-21 6. Cleaning the No. 6 Mirror 1) Detach the drum cartridge, developing ‘assembly, and dustproofing glass. 2) Put the mirror cleaning tool against the mirror as shown in Figure 4-22, and clean the lens by sliding it back and forth. No. 6 mirror r cleaning tool Butted. Figure 4-22 7. Lubricating Clean the scanner rail; then, apply lubri- cant evenly over it. | CANON NP-1550 REVO JAN. 1992 PRINTED iN JAPAN (IMPRIME AU JAPON) 4-9 EI MECHANICAL SYSTEM | :-:;_;_;_;_;_—_—_———— 220; C. Main Motor Assembly 1. Detaching the Main Motor } Detach the left cover and the rear cover. 2) Disconnect alt connectors, and remove the two screws from the DC controller PCB; then, detach the DC controller PCB. 3) Disconnect the connector (J104) from the | AC driver PCB. | te oh | — ac Sle = M AC driver PCB (2) Connector (J104) Figure 4-23 4) Remove the four screws, and detach the main motor as if to lift it toward the front. (DScrews (2 Main motor assembly Figure 4-24 4-10 COPYRIGHT © 1932 CANON INC. © CANON NP-1550 REVIO JAN 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) TS, 3) Remove the two screws, and detach the developing rail mount. MECHANICAL SYSTEM ES I. FEEDER SYSTEM 4) Remove the screws, and remove the two pins. A. Pick-up Assembly 1. Detaching the U Guide Plate 1) Detach the inside cover, right cover, and ==, rear cover; then, detach the right door. CSSS 2) Disconnect the two connectors, and т power cord mount. RE A NEU hb Le remove the cable clamp; then, shift the - If 3 (1) Screws @ Pins Figure 4-27 5) Detach the gear ® Connectors @ Screws @ Cable clamp Figure 4-25 Figure 4-28 (1) Screws @ Developing rail mount Figure 4-26 COPYRIGHT © 1992 CANONINC. CANON NP-1550 REVO JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 4-11 BES MECHANICAL SYSTEM 6) Remove the two screws, and disconnect 8) Detach the guide, if necessary, paying и the connector; then, detach the multifeed- attention to the pre-registration paper er solenoid unit. sensor lever. = N TS (D Screws 3 Multifeeder solenoid © Pre-registration @) U guide plate @ Connector unit paper sensor lever Figure 4-29 Figure 4-31 7) Remove the screw, and remove the pin 2. Detaching the Pick-Up Roller Shaft found at the rear. 1) Detach the U guide plate. 2) Detach the cassette. 3) Detach the pick-up roller bushing found at the font. (1 Screw @) Pin Figure 4-30 (D Bushing Figure 4-32 4 - 12 COPYRIGHT © 1992 CANON INC. CANON NP-1350 REV.1 SEPT 1982 PRINTED IN JAPAN (IMPRIME AU JAPON) > 4) Remove the screw, and disconnect the . connector, if necessary; then, shift the ... AC driver/DC power supply PCB. Figure 4-33 5) Detach the control ring from the pick-up roller shaft. | | | (D Control ring Figure 4-34 ' COPYRIGHT © 1992 CANON INC. . CANON NP-1550 REVO JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) MECHANICAL SYSTEM UB 6) Detach the pick-up roller bushing found at - the rear. | EQ Y o 1 M Bushing — Figure 4-35 7) Shift the pick-up roller shaft to the rear, and detach the pick-up roller shaft from the right door assembly. Jon © oJ REL II IRA, a UG | 119 9 9 TET, EE — il Y A EA A wl CACA ck == iD >] LIE | | p77 J 7 Г! _ h A == — y one UE * DD Pick-up roller shaft Figure 4-36 SM MECHANICAL SYSTEM FS 8) Detach the pick-up roller from the pick-up roller shaft. Ss Figure 4-37 (top view) Figure 4-38 (top view) 3. Pick-Up Roller | 1): Detach the pick-up roller from the pick-up roller shaft. 2) Detach the rubber member from the pick- up roller. nn (D Rubber member of pick-up roller Figure 4-39 4-14 COPYRIGHT © 1992 CANON INC, 4. Positioning the Pick-Up Roller Attach the pick-up roller to the pick-up shaft as shown in Figure 4-40; make sure that the pick-up roller is fitted into the mounting hole. (front) ; | (rear) Pick-up shaft Mounting hole (inches) | | —]] =. | | oi 5 E a go o Mounting hole (metric) \ Metric configuration only. Mounting holes without notation are inch/metric configurations. Figure 4-40 5. Detaching the Multifeeder Roller 1) Detach the right door; see p. 4-2. 2) Disengage the two hooks, and detach the U-turn guide unit. M Hook @ U-turn guide unit Figure 4-41 CANON NP-1550 REV. SEPT 1992 PRINTED IN JAPAN (MPRIME AU JAPON) aT MECHANICAL SYSTEM E . 3) Push and turn the pad spring support 5) Pinch the hooks of the two bushings assembly found at the bottom of the right using pliers, and detach the bushings. door unit 90 degrees. | ® Pad spring support Figure 4-42 4) Detach the pad unit. M Pad unit Figure 4-43 ‘COPYRIGHT © 1992 CANON INC. D Multifeeder roller © Bushing Figure 4-44 ha NC | ir GDS TS “Bes sure é lo o replate the pad also w 5 ever the « mmultigéger fo "er ; ( e "E me io: Pampa TE ‘CANON NP-1550 REVO JAN, 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 4-15 HN MECHANICAL SYSTEM B. Feeder Assembly 6) Hold the side of the feeder assembly clos- er to the fixing assembly, and pull it out u 1. Feeder r Assembly toward the front slowly as if to lift it. 1) Release the feeder assembly. 2) Detach the main motor assembly, see p. 4-10. 3) Remove the E-ring, and detach the bush- O Feeder assembly Figure 4-47 2. Feeder Belt 1) Detach the teeder assembiy. 2) Remove the two screws, and detach the rail cover found at the front. (D E-ring (2 Bushing Figure 4-45 4) Detach the inside cover, and remove the E-ring; then, detach the bushing. 5) Disconnect the connector, and detach the grounding wire (1 screw); then, detach the cord mount (1 screw). (M) Screws © Rail cover Figure 4-48 (D E-ring ® Grounding wire @ Bushing (4) Cord mount Figure 4-46 4-16 COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV. JAN, 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 3) Remove the two screws found at the front 6) Detach the feeder belt. : that hold the corona assembly | rail in place. ELEEEEREREERR == = EEE = EEE S En | 3 < — НО J © (D Feeder belt © Screws @ Coma assembly rail Figure 4-52 Figure 4-43 3. Feeder Fan (FM3) 4) Remove the three screws, and detach the terminal holder found at the rear. 1) Detach the feeder assembly. 3) Remove the four rolls. a е| [9 | о a al, | | o o © |” e — ©] ШИ (1 Screws O Terminal holder (1) Rolls Figure 4-50 5) Remove the two screws found at the rear, Figure 4-53 and detach the corona assembly rail. feeder fan. ff TTT E TA ETILITY MT ECEFECER CEET EEE SIETECEREEECEE E: ААА ХМ Ù ' COPYRIGHT © 1992 CANON INC. Figure 4-54 CANON NP-1550 REV.1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) oh; ; il Tim | | un 2) Detach the two feeder belts. TTT > | 5 — me 1 x N | 7 el Al a Tell! NEAL ПН A Screws (2) Corona assembly rail @ Screws O) Feeder fan Figure 4-51 MECHANICAL SYSTEM - 4) Remove the four screws, and detach the BEN MECHANICAL SYSTEM DM ; CTA IV. EXPOSURE SYSTEM A. Exposure Assembly 1. Detaching the Scanning Lamp 1) Disconnect the power plug. 2) Detach the copyboard glass. 3) Remove the two screws, and detach the anti-glare plate. (D Screws @) Anti-glare plate Figure 4-55 4) Push the lamp terminal plate (rear) into the direction of the arrow, and detach the scanning lamp. © Lamp terminal plate (rear) @ Scanning lamp Figure 4-56 COPYRIGHT © 1992 CANON INC. 2. Detaching the Thermal Fuse 1) Detach the control panel and the copyboard glass. 2) Hold the rear of the No. 1 mirror mount, and move it to the right until it is positioned ‘as shown in Figure 4-57. ote: son кора, Вы: y por prod ay - JB, Ce . e NO D © (D Screws @ Thermal fuse (3) No. 1 mirror mount Figure 4-57 3) Remove the two screws, and detach the thermal fuse. — CANON. NP:1550 REV.) JAN, 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) DL MECHANICAL SYSTEM I B. Blank Assembly 3) Hold the blank assembly on its bottom, and remove the four screws; then, pull 1. Detaching the Pre-Exposure PCB out the pre-exposure unit to the front. 1) Detach the rear cover. 2) Disconnect the connector (J731) from the pre-exposure PCB. ; 3) Hold the pre-exposure PCB using pliers, and pull it straight out taking care not to damage PCB. | 2. Detaching the Blank Assembly | Detach the copyboard glass, lens cover, rear cover, and drum unit; then, detach the developing assembly. 2) Disconnect the connector (J731) from the pre-exposure PCB, and the connector | ить (J30) from the blank solenoid. — —" (1) Screws Figure 4-59 (D Connector (J731) @ Connector (J30) @ HVT Figure 4-58 COPYRIGHT © 1992 CANON INC. | CANON NP-1550 REV.1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 4-19 EME CHANICAL SYSTEM —_—_—_—_—_—_—————————— V. CORONA SYSTEM A. Drum Unit 1. Detaching the Drum Unit 1) Release the feeder assembly. 2) Open the front door, and remove the Screw, (D Drum unit (3 Developing assem- (2) Developing assem- — bly release lever bly (4) Screw Figure 4-60 3) Turn the developing assembly release lever counterclockwise. 4) Pull out the drum unit to the front carefully. Note: as ELE ae Take © care not to damage the drum |2 > ‚мовы + > no : “The 6 photoserisitive drum is y suscepti по N ble to light; exposure to ever room light." | “can lead to white spots or: black lines on. the. copies. - Un LE de COPYRIGHT © 1992 CANON INC. As a rule, do not switch the copier ON TN with the drum unit detached. 2. Cleaning If the photosensitive drum is soiled, clean it using a flannel cloth coated with toner; do not use paper, lint-free or otherwise. que, EY me yt E 0. - mg На rta “De, not usé solvént © or y wipe the drum; never use: drum cleaning powder... 3 nd BY : Ö > UN Sa tw р, ; a ВОР Аа SE ue Y CANON NP-1550 REV.O JAN. 1932 PRINTED IN JAPAN (IMPRIME AU JAPON) E MECHANICAL SYSTEM El B. Primary/Transfer Corona — b. Transfer Corona Assembly Gut Wire and В Static Eliminator | Assembly Ш 1) Detach the transfer corona assembly from the copier. 1. Outline 2) Remove the two screws, and detach the The photosensitive drum is surrounded by static eliminator, taking care so that the the primary and transfer corona assemblies. gut wire will not come off. The primary corona assembly is equipped with a grid plate. ® 2. Disassembly/Assembly a. Primary Corona Assembly | | В | 1) Detach the drum unit. | Ваней (1) Screws "Figure 4-62 3) Detach the static eliminator 2) Disengage the hook, and puli out the primary corona assembly from the drum unit. @ Static eliminator Figure 4-63 (1) Hook (2 Primary corona assembly | Figure 4-61 COPYRIGHT © 1992 CANON INC. : CANON NP-1550 REV.) JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) ' 4 - 21 EEE MECHANICAL SYSTEM A c. Attaching the Primary/Transfer Corona 4) Cut the twisted end of the corona wire to Assembly Wire about 1;mm or less using a nipper. HE Primary Corona Assembly 5) Hook the loop of the corona wire as 1) Remove the four tension springs, and shown in Figure 4-65, and lead the wire detach the grid plate. | along the V-groove of the height adjusting | Croll. : | Hook the corona wire tension spring on the corona wire, and twist the spring three to four times as shown. Primary corona assembly (about 2 mm) (D Grid tension springs © Grid plate Figure 4-64 E Transfer Corona Assembly 2) Detach the gut wire from the transfer | corona assembly; see p. 4-21. a. Figure 4-65 3) Free about 40 mm from the corona wire | reel (0.06 mm dia.), and form a loop at its | end about 2 mm in diameter. 6) Cut the excess corona wire to about 1 mm or less using a nipper. 7) Pick the end of the corona wire tension spring using tweezers, and hook it-on the -Note:-- SEO ue “ ma coronaiterminal. 4 - 22 COPYRIGHT © 1992 CANON INC. CANON ‘NP-1550 REVO JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) A MECHANICAL SYSTEM III; VI. DEVELOPMENT 3. Detaching the Blade, Developing | Cylinder, and Side Seal SYSTEM | 1) Detach the developing assembly from the | copier. | . 2) Remove the screw, and detach the upper A. Developing Assembly cover fixing plate. 1. Construction 3) Detach the top cover. 4) Remove the two screws, and detach the developing assembly upper cover. Stirring rod @ Screws @ Developing assembly Figure 4-66 ~~ Upper cover o — Figure 4-68 2. Detaching the Developing | Assembly | 5) Place a newspaper on the floor, and pour . lever counterclockwise. bly. 2) Slide out the developing assembly care- 6) Remove the two screws, and detach the fully. — | 3) Hold the grip on the developing assembly, and take the assembly out the copier. | | blade mount together with the blade. (1) Screws Figure 4-69 (D Developing assem- O Developing assembly release lever bly Figure 4-67 COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV.0 JAN. 1392 PRINTED IN JAPAN (IMPRIME AU JAPON) 4-23 BEE MECHANICAL SYSTEM 7) Disengage the hook on the bottom, and detach the grip. O d DD Hook @ Grip Figure 4-70 8) Remove the three screws, and detach the developing cylinder holder (front), ball bearing, and developing roll. DsScrews . @ Developing roll (2) Developing cylinder holder Figure 4-71 4-24 COPYRIGHT © 1992 CANON INC. 9) Remove the two E-rings, and remove the two gears. | | D @ E-rings @ Gears Figure 4-72 10) Remove the two screws, and detach the developing cylinder holder (rear), ball bearing, and developing roll. O 8 @ Screws (3 Ball bearing O Developing cylinder (4 Developing roll holder Figure 4-73 11) Detach the developing cylinder and side seal. . CANON NP-1550 REV.1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) TTT = ` 7 ' —_—_—_—___"_— 1 E CHANICAL SYSTEM HS 4. Attaching the Side Seal and the Blade | 1) Clean the surface on which the side seal will be attached using alcohol. 2) Attach the side seal at-the position shown in Figure 4-74. Attach the seal so that the long hole at its end is matched with the round hole of the developing assembly housing. Side seal Butted. Figure 4-74 Side seal {shorter} See note. Side seal (longer) Figure 4-75 Note: ; E e TOR ” ea AN ще о Put the Loading edge of the long Aide: seal against the face: ot the: shorter ; e side bored and: attach’ them: making a sure, © COPYRIGHT © 1992 CANON INC. 3) Attach all parts that have been detached except the blade. | Make sure that the gear is assembled with the longer tooth in the groove. ® Figure 4-76 4) Force the blade mount against the developing assembly in the direction of the arrow, and tighten the two screws. Blade mount Side seal Figure 4-77 5) Loosen the four screws that hold the blade on the blade mount, and tighten them again. E 4; 6 ow E ©. “ ing pin found at the center. 5 me a al e e arm A ' hs : ь CANON NP-1550 REVO JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 4-25 EE MECHANCAL SYSTEM EE ET VII. FIXING SYSTEM 2) Remove the three screws, and detach the blanking plate and the left cover. A. Fixing Assembly 1. Construction Upper separation claw Cleaning roller Upper roller О. Lower roller @ Screws © Left cover | (2 Blanking plate | Lower separation claw Paper guide | Figure 4-80 Figure 4-78 3) Disconnect the three connectors. 2. Detaching the Fixing Assembly 1) ‘Remove the screw, and detach the fixing assembly knob. lL PITTI TIT IT III | ' +» (D Connectors Figure 4-81 Screw @ Fixing assembly knob Figure 4-79 4-26 COPYRIGHT © 1992 CANON INC. CANON NP-1850 REV.1 SEPT, 1882 PRINTED IN JAPAN (IMPRIME AU JAPON) и TT {ln MECHANICAL SYSTEM ES 4) Remove the two screws, and slide out the fixing assembly. | — 22.2 — \J Е —=——A 1 res MScrews Figure 4-82 3. Detaching the Upper Fixing Roller, Heater, and Lower Fixing Roller 1) Detach the fixing assembly from the copier. 2) Pull out faston A, and remove the screw; "the heater mount plate (front) can be . detached in this condition. 3) Pull faston B (see Figure 4-83), and remove the mounting screw from the heater mount plate found at the rear; then, pull out the heater mount plate (rear) and the heater carefully. (1) Screw (3) Heater @ Heater mount plate (rear) Figure 4-84 4) Remove the two screws, and detach the thermistor cover. © (D Screws @ Thermistor cover | Figure 4-85 (1) Faston A (3) Heater mount plate @ Screw (front) @ Faston B 5) Remove the screw, and detach the ther- | | | mistor. Figure 4-83 COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV.{ SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 4 - 27 I MECHANICAL SYSTEM 6) Remove the three screws, and detach — 8) Remove the E-ring, and detach gear A. the thermoswitch. © 9) Remove the C-ring, and detach two gears @ Screws (3) Thermoswitch | O Thermistor D E-ring © C-ring | @ Gear A @ Gears B | Figure 4-86 Figure 4-88 7) Remove the C-ring at the rear, and detach | | the gear. | 10) Remove the two screws, and detach the bushing. = qu Note: ….— … >" NE ate ; * pe LR E ELA AA gy po. NE Lo D CE RTE Ta ey E a BEL АВ акта а ad 7 vim lai due 7 ' wen He DU shing:-is pusned up. tom low ' ! Fer x >. я od - . ri Mas i Ry GE Rt ae doe, e Ne RI DA a * “and is difficult to detach; try pushing the . upper, fixing roller to. the bottom to facili- ' Зе, - oil 5 - de NA EE . EE Le ESTO au RE i Ea e PEE AP RO a = at ! AA aa! * A Le A Ta + a 5 a Я De wn Ten Te aa EE ade ie Золе В be rene 2° 640 7 $ 1 BE ren wren s an , 4 ‘ее QD) C-ring (2) Gear Figure 4-87 @ Screws Bushing Figure 4-89 4-28 COPYRIGHT © 1992 CANON INC. | CANON NP-1550 REV.1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) — (17 > \ ' | MECHANICAL SYSTEM EEE 11) Push the pressure spring of the lower fix- 5. Adjusting the Nip Width (tightening . ing roller using a screwdriver, and detach the upper fixing roller. the pressure adjusting nut) if the nip width is not as shown in Figure 4-91, turn the bolt to adjust it. Feed direction D Center of copy DD Screwdriver . © Lower roller | Figure 4-91 . Figure 4-90 US “a and © represents pol ines: 40% mm from 12) Detach the lower fixing roller. he eécts end e E 4. Attaching the Heater and Upper Fixing Roller Dimension Measure after the upper and lower Attach the heater and the upper fixing rollers have heated up. roller as in detaching them but in reverse b 4.0 0.5mm order while noting the following: la-cl 0.5mm or less a. heater . Do not touch the surface of the heater. ii. Make sure that the end bearing the man- Table 4-1 ufacturer's name is to the front. b. Upper Fixing Roller i. Wrap the roller with copy paper to pre- nn vent soiling or scarring the surface of — @& Measuring the Nip Width the roller. If the roller is not heated, wait for 15 min- ii. Make sure that the end with two C-rings utes after the WAIT indicator has changed ' istotherear.. | to green; then, make 20 copies before tak- ‘ii. Make sure that the two identical gears ing measurements. are used at the front. _ | ' b. Taking Measurements 1) Lift the copyboard cover, and make an A3 copy of a solid black document. 2) Switch the copier OFF as soon as the leading edge of the copy comes out of the copier, and open the front door and the delivery assembly. COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV SEPT 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 4-29 IN MECHANICAL SYSTEM (I —t_];.V;";—];]Ú;;———];—T;;;;;;;zTL—;——;;——;;;;;;;;;——;; ;L——;—][] 3) Turn the fixing assembly knob counterclockwise slightly, and hold it for 15 minutes; then, turn the fixing assembly knob to remove the copy. 4) Measure the width of the area where toner is shiny; see Figure 4-91, 6. Attaching the Thermistor Make sure that the sensor face of the thermistor is in even contact with the surface of the upper fixing roller. - Note: e NE The position of he thermistor need m С be adjusted; ifs the -Contáct-is not even, make sure ‘that’ the “thermistor ‚Spring: is, г not deformed. a | a A Upper roller Thermistor Figure 4-92 7. Attaching the Thermoswitch Make sure that the sensor face of the thermoswitch is in even contact with the surface of the upper fixing roller. 4 - 30 COPYRIGHT © 1992 CANON INC. Notes. ee parc ge mit he posi ition of the inármosaiter need‘. : “not be adjusted; if thé contact is not even, -: make sure:that the: thermoshiichis spring le is: not deformed. o 3 Ри br rn wae Td Leaf spring ———- Thermoswitch Upper roller + Figure 4-93 | 8. Position of Paper Guide The position of the paper guide is adjusted by the paper guide mount. For this reason, the position of the paper guide need not be adjusted. CANON NP-1550 REV.O JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) ta TN Pa 5 CDS MECHANICAL SYSTEM ENS Notes. on o 3) Shift the lever, and detach the cleaning Te adjust thé position of; the paper - roller. re the: fixing; ‘assembly ona. ROA o-heopah ef guide so: ihat mn FINE 0. Paper guide [ | (D Cleaning roller @ Lever == | Figure 4-96 Figure 4-94 ВЕ 10. Detaching the Upper Separation 9. Detaching the Cleaning Roller Slaw del ы 1) Open the delivery assembly. 1) Open the delivery assembly. | | " 2) Detach the cleaning roller. 2) Remove the screw, and detach the fixing plate. 3) Remove the two screws, and detach the upper separation claw assembly. ESSE © @ Screw Fixing plate | @) Screws O Upper separation claw Figure 4-95 assembly Figure 4-97 4) Remove the spring, and detach the upper separation claw. COPYRIGHT © 1992 CANON INC, CANON NP-1550 REV.1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) BEN MECHANICAL SYSTEM NE 7 11. Attaching the Upper Separation 12. Detaching the Lower Separation Claw Claw | Attach the upper separation claw as detach- 1) Detach the delivery cover; then, open the > ing it but in reverse order with the following in delivery door, and detach the lower sepa- mind. ration claw retainer. a. Make sure that the boss on the upper separation claw is in contact with the mount as shown in Figure 4-98. = Prk == pres ities AF E ENE i à —— N BEZ A | Re . . . |) y | ETE 7 = re] EF 1 Screws | Figure 4-100 Figure 4-98 9 2) Remove the springs from the lower sepa- b. Make sure that the upper separation claw ration claw. assembly is fully toward the rear. If a scratch is noted on the upper fixing roller, move the upper separation claw assem- == bly about 4 mm toward the front. AMAN Figure 4-99 (D Springs Figure 4-101 Apply heat-resisting grease (CK-0427) over the following sections on a periodical basis. . a) engagement of gears (rear) b) gear ‘assembly of fixing knob 4-32 COPYRIGHT © 1332 CANON INC, CANON NP-1550 REV.1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) LOCATION The location of the copier should be chosen: based on the following considerations. If possible, make à visit to the user for a study of the site before. delivery of the copier. a. COPYRIGHT © 1992 CANON INC. The ambient temperature should be between 15° and 35°C and the humidity, 10% to 80%. Avoid locations near water faucets, humidifiers, water boilers, and. refrigerators. . Avoid locations near open fire or subject to dust or ammonia fumes and direct rays of the sun. Provide curtains over the windows if necessary. . Choose a well-ventilated place. . Make sure all feet of the copier will be in contact with the floor. . Allow at least 10 cm from any wall to provide access. 1.5m min. 0 Copier || 10 cm min. | L 2 тп min——— Figure 5-1 | 10 em min, , Copier | 1.5 m min. run 25m min. _ Figure 5-2 (with sorter) ‚ САМОМ NP-1550 REVO JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) INSTALLATION E GE INSTALLATION — — — _—_—_—_—_—_—_————————————— Il. UNPACKING AND INSTALLING THE COPIER When a piece of metal is moved from a cold place to a warm place, droplets of water form on its surface. This phenomenon is known as condensation and affects the performance of machines. The simplest way to eliminate condensation in-the copier, any machines for that matter, is to leave it alone until it warms to room temperature’ (at least one hour). A. Unpacking Step |. Work | Remarks 1 | Open the shipping carton. 2 | Place the hands beneath the front and rear of the base plate of the copier (on | — skids), then raise the copier and place it | | on a pedestal or a desk. 3 | Open the cardboard box, and take out the ‘Check that the following are available: parts and accessories. * Copy tray « OPERATOR'S MANUAL * Drum unit 4 | Remove all tape, and take out the cassettes; remove the cushion blocks from inside the cassettes. 5 | Remove the tape that secures the optical Ш unit in place (outside the left cover), and Tape Fixing for optical unit slide the fixing to the right and pull it out. | | 6 | Open the front cover, and disengage the Check that the developing cylinder is free developing assembly, and remove it from | of scratches. the copier. 5-2 COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV: SEPT.1992 PRINTED IN JAPAN (IMPRIME AU JAPON) INSTALLATION E | Step Work Remarks 7 | Remove the cushion blocks from the feeder assembly and fixing assembly. 8 | Pull the spacer (if found”) to the front to detach. *Some previous machines may not have it. 9 | Disengage the feeder assembly, remove the knob, and remove the dummy drum. Keep the knob for use later. 10 '{ Remove the lens lock screw (w/ shipping tag) from between the drum unit rails of the copier. | COPYRIGHT © 1992 CANON INC. - CANON NP-1550 REV.1 SEPT 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) WR INSTALLATION Step Work | Remarks 11 | Open the delivery cover, and remove the two fixing roller release rolls; then, close the delivery cover. Release rolls B. Mounting the Drum The photosensitive drum is susceptable to light; if exposed to room light, it can cause white spots or black lines on the copy images. As such, be quick in performing the following work. Step Work Remarks 1 | Take out the drum unit from the box, Drum ünit and remove the light-blocking sheet. Light-blocking \ sheet RN Take care not to damage the drum. 2 | Set the drum unit in the copier, and fix it | Slide the drum unit straight along the rails in place using the knob that held the into the copier dummy drum. 3 | Move the grip to clean the corona wire of the drum unit two to three times. 4 | Set the developing assembly in the The front cover may be left open. copier, and engage it. | 5-4 COPYRIGHT © 1992 CANON INC. CANON NP-1550 REVi SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) UE INSTALLATION EE C. Checking the Operation Step Work Remarks 1 | Turn the door switch ON using the door switch actuator. 2 | Connect the power plug, and shift the Check that the ADD PAPER and CAS- POWER switch to "ON". SETTE OUT indicators go ON and the | WAIT indicator lights red. — 3 | Setthe cassette size to suit the needs of | See p. 5-8 the user. . | 4 | Put copy paper in the cassette, and set * Check that the ADD PAPER indicator goes the cassette in the copier. OFF. | * Press the keys, except the COPY START key, on the control panel, and check | that each operation is correct. 5 | Setthe copy tray on the copier. 6 | Open the copyboard cover, and remove the paper and the protection seal from the document size plate. 7 | Record the reading of the'copy counter. 8 | Make a copy after the COPY START key | Check the following: has gone green. | * No abnormal sound is heard; and Wait for ten seconds or more after the * The ADD TONER indicator flashes about drum has stopped, and make another five to ten seconds after the second copy. copy operation is over. 9 | Check that the counter operates properly. | Check that the reading has increased by two | from the reading recorded in step 7. ' COPYRIGHT O 1992 CANON INC. CANON NP-1550 REV.O JAN. 1992 PRINTED (N JAPAN (IMPRIME AU JAPON) 5-5 M INSTALLATION E D. Adding Toner Step Work | Remarks 1 Remove the door switch actuator. 2 Disengage the developing assembly, and slide it until it stops. Shake the toner cartridge well. Open the developing assembly lid, and fit the boss on the rear end of the toner cartridge into the hole of the plate on the rear end of the developing assembly; thereafter, pull the toner cartridge to the front somewhat so that it comes into contact with the boss found on the left side of the front. Hold the toner cartridge, and pull on the seal to the front until it stops. Tap lightly on the top of the toner cartridge until all toner has fallen into the developing assembly. Remove the toner cartridge, and keep it in an empty box. Close the developing assembly lid, and slide the assembly inside until it stops. Turn the developing assembly lever clockwise to engage it. 10 Close the front cover. 11 Set a blank sheet of paper (A3/11"x4 7") on the copyboard after the COPY START key goes green, and make six to ten copies. The operation causes the toner inside the developing assembly to be stirred. COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV. SEPT 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) EE {INSTALLATION IH E. Checking the Image Step 5 Work Remarks 1 | Place the Test Sheet on the copy- Check that copies are made without a problem / board, and check the image. and the non-image width along the leading | | edge is correct; otherwise, make adjustments. Non-image width: 2.0 mm (approx.) for leading edge 2.5 mm (approx.) on left/right side 2 | Feed paper in the manual mode. Make tow-sided and overlay copies, and check | | that the operation is correct; otherwise, make adjustments. и 3 | Putthe OPERATOR'S MANUAL in the pocket of the copyboard cover. 4 | Clean up the area around the copier, and fill out the Service Sheet. When all above work is finished, install the options (ADF-A1, MS-A1, Stapler Sorter-B1, and Control Card V) and the document holder. HB Points to Note for Photosensitive Drum Do not touch the drum: if its surface is After Installation | soiled, wipe off the dirt using a flannel cloth coated with toner. Do not use paper, lint- The photosensitive drum is susceptible to free or otherwise, or use a dry cloth or light and, if exposed to light, can cause solvent. white spots or black lines on the copy image; take note of the following: TN * Limit the replacement of the CT unit within one minute; — Limit the removal of jams within five minutes; and » Keep the drum wrapped in the light- blocking sheet (from drum unit) or fresh copy paper and place it in a dark place whenever it is removed from the copier. | COPYRIGHT © 1992 CANON INC. CANON NP-1550 REVO JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 5-7 SEN INSTALLATION DL. lll. SETTING THE CASSETTE SIZE The copier's cassette may be modified to suit the desired paper size by modifying the rear stop plate, spring, and face plate. 1. Modifying the Cassette Size 1) Turn over the cassette, and remove the screw that holds the rear stop plate in place. Figure 5-3 2) Change the rear stop plate to suit the desired paper size; note the index on the bottom, and see Table 5-1. gi plas: note: the index on с" ; E HE vs gi E, . e Tn Sena Ta: TA Tam © 0 yen ue $ dal HN À 5-8 COPYRIGHT © 1992 CANON INC. Copy paper Size Rear stop plate A3 | 297mmx420mm A3 | (11.7"x16.5") 11x17 279.4mmx431.8mm 11x17 (11"x17"). Ad 210mmx297mm Ad | (8.3"x11.7") Letter | 216mmx279mm LTR | (8.5"x11.0") Government Letter | 208mmx267mm G. | (8"x10.5") | (7.5"x10.4") B4 257mmx364mm B4 (10.1"x14.3") Legal 216mmx356 mm LGL (8.5"x14.0 | B5 182mmx257mm B5 (7.2"x10.1") а! 220mmx280mm Arg. Argentine Litter (8.7°x11.0") A4-R | 297mmx210mm A4 | (11.7"x8.3") | Letter-R 279mmx216mm СТАВ) (11.0"x8.5") B5R 257mmx 182mm BSH] (10.1"x7.2") Argentine Legal 220mmx340mm Arg.LGL (8.7"x13.4") Government Letter-R| 267mmx203mm G.H | (10.5"x8.0") Government Legal | 203mmx330mm G.LGL | | (8.0"x13.0") Argentine Letter-R || 280mmx220mm Aro. | (11.0"x8.7") Foolscap 216mmx330mm FLS | (8.5"x13") Folio 210mmx330mm FOLIO | (8.3"x13") Australian Foolscap | 206mmx337mm Aus.FLS (8.1"x13.3") (10.4"x7.5") Officio 216mmx317mm OFC (8.5"x12.5") Ecuadorean 220mmx320mm Е. Officio (8.0"x12.6") Bolivian Officio 216mmx355mm | BLV | (8.5"x14.0") Table 5-1 CANON NP-1550 REV.O JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) Tm Bottom of cassette | | Figure 5-4 3) Fix the stop plate in place using screws. 4) Remove the side stop plate each from the two cassettes. 4 Side stop plate Shift the leaf spring in this direction to remove — INSTALLATION UN 6) Slide the paper size plate along the index on the bottom of the cassette to suit the desired paper. Paper size plate T ac Screw AE «у Y 6 ZL pe Figure 5-6 7) Place about 100 sheets of paper (fresh out of package, of the desired size) in the cassette, and butt them against the front of the cassette. 8) Keep the side stop plate between the bunch of sheets and size plate as shown, and screw the size plate using a screw; make sure that the size plate is butted. Side stop plate Side stop plate — i; = So Size plate the side stop plate Figure 5-7 Figure 5-5 9) Fix the side stop plate in its original | | location. 5) Remove the screw that hold the paper size plate in place. : COPYRIGHT © 1992 CANON INC. ; CANON NP-1550 REVO JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 5-9 IER INSTALLATION 10) Set the cassette size tab. Cassette ‘Tab | | Copy paper & æ |olololo : |B5 D} | U1 = > [a [O/C — | B5-R 10 B4 O ' A4-R OO | As 1109/00 | U3 С [ASR |0 0 | uz [| 0 ® ® © O | LTR DIO |O STMT-R (OO LGL di 0/0 LTR-R ОТО |3 11х17 (О | 010 []*** tab present U1: Korean-R U2: Others U3: Korean, Argentine Letter, Government Letter. Figure 5-8 5-10 COPYRIGHT © 1992 CANON INC, CANON NP-1550 REV. JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) E INSTALLATION E 11) Detach and attach the plate; see Table 5-2. 1 Copy paper size Face plate A3 abcd 11x17 . ‘abcd. Ad abcd Letter abcd Argentine Letter abcd’ Government Letter abc Korean abc B4 abc B5 abc A4-R ab Letter-R ab Argentine Legal ab Government Letter-R ‚ab Claw Government Legal ‚ab Argentine Letter-R ab Foolscap ab Folio ab Australian Foolscap ab Officio ab Ecuadorean Officio ab Bolivian Officio ab Legal ab Korean-R a BSR a Table 5-2 Face Face Face Face plated plate c plate b plate a / Inside plate „С MENTA | 4 УГ М (CHU 12) Attach the size label on the cassette; if the label is not available, write the size Figure 5-9 on a blank strip of paper. "COPYRIGHT © 1992 CANON INC. 2. Replacing the Cassette Spring The copier can be reset for a different size of copies by modifying the cassette spring as shown in Table 5-3. | Size of paper Color of spring A4/A3 green 11x17/L TRA A4R/BSR/LTR-R yellow LGL/STMTAI B4/B5 red Table 5-3 . : ARGENTINE LTR GOVERNMENT LTR KOREAN : ARGENTINE LGL GOVERNMENT LGL ARGENTINE LTR-R GOVERNMENT LTR-R_ FOOLSCAP FOLIO AUSTRALIAN FOOLSCAP KOREAN-R - ECUADORAN OFICIO BOLIVIAN OFICIO — Remove the rubber stopper from the inside plate. Rubber stoper Figure 5-10 CANON NP-1550 REV. JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) ~ 5-11 BEN INSTALLATION 2) Remove the inside plate and spring. Figure 5-11 3) Change the spring as shown in Table 5-3. 4) Set the inside plate, and attach the rubber stopper. Inside plate Hooked Figure 5-12 Check that the rubber stoppers are correctly attached; further, check that the spring at the rear is correctly set on the fixing behind the inside plate. Spring fixing Inside plate ———— Cassette Spring | _ ] Figure 5-13 5-12 COPYRIGHT © 1992 CANON INC. 3. Removing the Pick-Up Roller . If the cassette is sized to. GOVERNMENT LTR, KOREAN, or KOREAN-R, remove the pick-up rollers shown below (metric rollers). + GOVERNMENT LTR and KOREAN Figure 5-14 * KOREAN-R Figure 5-15 CANON NP-1550 REVO JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) и = r ; IV. SETTING THE CT UNIT 1) Hold both ends so that the yellow seal (round) is to the front, and turn it in the direction of the arrow about ten times as shown below. Figure 5-16 2) Take the CT unit from the storage case, and set it in the copier; thereafter, hold the CT unit in place, and pull the yellow tab straight out. Tab (yellow) Figure 5-17 COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV.0 JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) INSTALLATION I 3) Put the CT unit back into the storage case, and roll it about ten times in the direction of the arrows. SD Figure 5-18, 4) Shake it in the direction of the arrows about ten times. (= Figure 5-19 5) Set the CT unit in the copier once again, and make test copies in the DIRECT mode; repeat step 4) if the image is uneven. | 6) Set the CT unit in the copier, and pull the orange tab straight out; thereafter, close the front door. Tab (orange) | Figure 5-20 SED INSTALLATION ———.——.s[]]— ——;—]—;—;—;—];—;—;—;—;;—;—];——;—;—;—;—;—;—;——;—]]—;—;—;—;—]————— V. RELOCATING THE COPIER Perform the following when relocating the copier by truck or other means of transportation. Step Work Check | Remarks 1 Remove the drum unit. Put the drum unit in a box for transport. 2 | Fix the scanner and lens in place. 3 | Tape the corona assemblies and feeder assembly release lever in place against vibration. 4 | Tape the front door and delivery assembly. 5 | Place a sheet of A3 or 11"x17" paper on the copyboard glass, and tape the copyboard cover. Table 5-4 COPYRIGHT © 1992 CANON INC. “+ CANON NP-1550 REV.1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 6) Place the clear sheet over the hole of the INSTALLATION IB VI. SETTING CONTROL ~~ CARDV Open the front door, and remove the ‚ Inside cover. a 2) Remove the controi panel; see p.4-2 _ — Sa 3) Turn over the control panel, remove the screw that holds the face lid in place. 4) Remove the face plate. | D @ @ Holes for mounting screws Figure 5-23 (1) Mounting screw @ Face lid Check that the connector for the printer is | found at the center of the hole. Figure 5-21 En енньльлинь лы 5) Remove the protection sheet from the indicator unit of Control Card V. indicator unit. C1 GRR о © a D D Hole (D Connector for printer Figure 5-22 Figure 5-24 7) Fix Control Card V on the control panel using four mounting screws. Slide a card into Control Card V, and fix Control Card V where the card can be slid in and out easily. COPYRIGHT © 1982 CANON INC. CANON NP-1550 REVO JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 5-15 SEM INSTALLATION 8) Attach the grounding wire for Control Card V. - (1) Grounding wire Figure 5-25 9) Disconnect the shorting connector of the control panel shown in Figure 5-26. 10) Connect the 4P connector of Control Card V and the 4P connector of the control panel on the copier side. D Shorting connector (2) 4P connector Figure 5-26 5-16 COPYRIGHT © 1992 CANON INC. 11) Mount the control panel on the copier. 12) Remove the protection sheet from the contro! panel guide plate of Control Card \ | 13) Attach the control panel ‘guide plate of Control Card V on the control panel of the copier. | M Guide plate Figure 5-27 14) Turn the copier ON, and check the operation of Control Card Y, 15) Attach the inside right cover. CANON NP-1550 REV.1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) —— Vil. ATTACHING THE DOCUMENT HOLDER 1) Fit the two stepped screws (M4 x 5) on the right side plate of the copier. — o у Г WS Figure 5-28 2) Hook the retainers of the document holder on the stepped screws. = = —— —]]— = = = — — ——= — E - —— | = == — — === ПР По о = == — — — — — = Figure 5-29 CANON NP-1550 REV.O JAN, 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) ‚ COPYRIGHT © 1932 CANON INC. INSTALLATION IR AID MAINTENANCE AND SERVICING HE |. PERIODICALLY REPLACED PARTS — To maintain the copier at its peak performance, the parts listed in the following chart must be ‘replaced periodically. Although the deterioration of a part may not be visible, it can seriously “hamper the performance of the copier if not replaced on schedule. | Parts should be replaced during the regular service visit that is closest to the end of the service life of the part. ‘as of SEPT. 1992 | No. Description Part No. |Quantity{Replacement| Remarks | 1 | Ozone filter FF2-5595-00P| 1 - 1 year 2 | Static charge eliminator , FF1-9438-050 1 50,000 . | 3 | Transfer corona wire FY3-0040-000| AR 100,000. ` | 115/220/240V | 4 | Side seal, upper (short)(develop- FA5-1790-000| 2 100,000, | | ing assembly) | | | | Side seal, lower long) develop- FA5-1769-000| 2 100,000 | ing assembly) | Ш / 5 | Front developing cylinder spacer | FA5-1766-000 1 100,000 | roller | Ш | 6 | Rear developing cylinder spacer | FA5-1767-000 1 100,000 roller | dee m5 rage es эта MO ANA dt E e UMN EA E EA e > > > Enter e e ВЕР E © „as Я + va to ; ; 5 Ha E phi 5° mee : Ш зоб to i 1 . COPYRIGHT © 1992 CANON INC. . CANON NP-1550 REV.1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 6-1 BES MAINTENANCE AND SERVICING ET ll. DURABLE PARTS The values shown in the table below indicate the expected average life (number of copies) of parts which may require replacement at least once during the warranty period due to deterioration or damage but which can be simply replaced to restore the performance of the copier. | | as of SEPT. 1992 No. Description Part No. Quantity Service life Remarks | (number of copies) | 1 Oil-applying roller (fixing FA5-1952-000 1 20,000 assembly) | 2 | Scanner drive cable FA5-2073-000 1 100,000 3 | Scanning lamp (scanner) FH7-3114-000 1 100,000 220/240V 4 | Paper pick-up roller (pick- up | FC1-0676-00P| 6 100,000 | assembly) | | 5 | Slide scraper (developing FA5-1768-000| 2 100,000 assembly) | 6 | Upper fixing roller bearing FS1-1240-000| 2 . 100,000 (fixing assembly) 7 Pre-exposure lamp FG2-4048-00P| 1 200,000 8 | Upper fixing roller (fixing FA5-1916-050 1 200,000 assembly) | g | Lower fixing roller (fixing FA6-3921-000| 1 200,000 assembly) 10 | Upper separation claw (fix: | FB1-0301-000| 5 200,000 ing assembly) 11 | Lower separation claw (fix- — | FA2-9037-000| 5 200,000 ing assembly) 12 | Multi feeder roller FC1-0741-00P| 1 90,000 Must be replaced 13 | Pad (multi feeder) FC1-0736-00P| 1 90,000 at the same time. - Note:. “The ‘above values are: estimates. and are’ subject | to 0 shane certo ] - experiance. 1 COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) DL MAINTENANCE AND SERVICING HS BASIC PROCEDURE FOR PERIODIC SERVICING et Ta > ‘ E are Pet aus a В » DA Procedure Check Remarks Note the operator's comments. Conditions of copier Record the counter reading Number of miscopies Make DIRECT and two-page overlay test copies. a. Image density b. Dirty background c. Clarity of letters d. Leading edge blank area e. Left and right margins f. Fixing, synchronizing, and soiling of back g. Unusual noise h. Operation of counter Standard: 2.0+1.5mm (DIRECT) Standard: 10.0+2.0mm (DIRECT), front side Clean the corona assemblies. Wipe dry using lint-free paper then clean using alcohol. Clean separation feeder assemblies. Clean fixing and delivery assemblies. * Paper guide plate + Separation claws (upper and lower) Alcohol Perform the periodic servicing appropriate to the number of copies (see page 6-4). Clean the copyboard cover and the copyboard glass. Check the amount of waste toner, 10 Make test copies. 11 Make sample copies. 12 Select sample copies to keep for the customer record. Clean up around the copier. Record the final counter value. Fill in the service sheet and check out with the person in charge. COPYRIGHT O) 1992 CANON INC. - “CANON NP-1550 REV. SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) El MAINTENANCE AND SERVICING E IV. PERIODIC SERVICING SCHEDULE A: Clean e: Replace x: Lubricate 0: Adjust €: Check Periodic servicing Unit Description Every *| Every Remarks 15,000 30,000 |. copies copies | Externais Copyboard glass A ' Clean with alcohol. Ozone fitter Replace yearly. Scanner drive Scanner rails Clean with aicohol then unit X apply high-vis-cosity lubricating oil (TKN-0451) Feeder Transfer guide A Damp cloth Feeder belt A Feeder frame A | Optical path. Scanning lamp A Clean with a blower reflector brush. If very dirty, Scanning lamp side A clean with alcohol. reflector Clean mirrors 5 and Mirror 1 to 6 A 6 with mirror clean- Lens A ing tool. Dustproofing glass A | Corona Primary corona A Dry wipe using lint- assemblies assembly free paper, then Primary corona wire A clean using alcohol. Transfer corona A assembly Transfer corona wire A Static charge A Damp cloth eliminator ; Developing Developing rollers A Clean with aicohol. assembly (front and rear) | Side seals (front and rear) Fixing assembly Upper fixing roller A Clean with cleaning Lower fixing roller A oil. Paper guide plate A Clean with MEK. Separation claws A (upper and lower) * Items to be cleaned every 15,000 copies or over 6 months, whichever comes first. < Option : Stapler Not designated. Sorter - B1 > COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV. SEPT.1992 PRINTED IN JAPAN (IMPRIME AU JAPON) TS, —— Sen » A. GENERAL TIMING CHART Power switch 170°C 180°C COPY START key | - ON (150°C) (160°C) : indicate Can start (A4, AE, 2 copies) Sequence WMUP WMUPR STBY INTR -- E scRV -|- “LSTR ~~ | sy — a {Tr AER | Scanner cooling fan/Feeder fan {FM1/FM3), Fixing roller heater (H1) Primary/Transfer corona assembly Developing bias DC component | Developing bias AC component Developing bias AC Component (CT unit is used) Scanning lamp (LA1) | sensor X ) signal bias ON/OFF motor (M2) movement solenoid (SL2) *3 movement home position sensor (Q4) signal REDUCTION solenoid (SL4) solenoid (SL3) “8 clutch solenoid (SL1) clutch (CL2)*8 paper (Q1) signal 8 paper (Q?) signal roller clutch-(€L1}- paper sensor (Q5) signal fan (FM2) counter (CNT1) intensity contro! signal (LIC) *6 Varies depending on the reproduction ratio and the setting of “leading edge (C3)' in the service mode. Generated only when the CT unit is in use to increase the of the scanning lamp. ‘и Varies depending on the cassette size and the selected reproduction ratio. Rotates at lower speed for 30 sec when the black developing is used and 120 sec when the *3 Varies depending on the reproduction ratio. CT unit is used. ; *4 Varies depending on the setting of ‘arc adjustment (C4) ' in the service mode; multifeeder in use. *8 Used only when the multifeeder is in use. *5 Varies depending on the cassette size: 9 Varies depending on the setting of "leading edge non-image in the service mode. "10 Varies depending on the cassette size. COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV.1 SEPT, 1932 PRINTED IN JAPAN (IMPRIME AU JAPON) НЯ TA wie = в <MULTI FEED> (A4, 2copies, multifeed) | COPY START key | Scanner cooling fan/Feeder fan (FM1/FM3), Fixing roller heater (H1) Primary/ Transfer corona assembly Developing DC component Developing AC component Developing bias AC component (CT unit is used) Scanning lamp (LA1) Scanner home position sensor (Q3) Grid bias ON/OFF Scanner motor (M2) Registration roller cluteh (CL1) Pre-registration paper sensor (Q2) Delivery paper sensor (QS) signal Exhaust fan (FM2) Total counter (CNT 1) Light intensity control signal (LIC) Multifeeder clutch (CL2) Multifeeder solenoid {SL3) Multiteeder paper sensor (Q1) | - | | - - — *Varies depending on the setting of 'arc adjustment (C4) in the service mode; multifeeder A-2 | COPYRIGHT © 1992 CANON INC. CANON NP-1550 REVO JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) B. LIST OF SIGNALS/COMMANDS 1. SIGNALS ACBON ACOFF AE AE-BIAS AEGIN BLSD BTEP CCNTD CCNNT CPEP CSIN CSZ0 CSZ1 CSZ2 CSZ3 CSZ4 CTD DCBC FM1D FM2D FM3D GRBC GRDON HTRD HVTON LAON LGHT LHP LIC LNSD MFCD MFPD MFSD MMD PDP1 PDP2 PEXP PUSD RGCD RDC SCHP TCNTD TEP TH1 ZXDP 2. ABBREVIATIONS AER INTR LSTR SCFW SCRV STBY WMUP WMUPR COPYRIGHT © 1992 CANON INC. AC BIAS ON command AC SHUT-OFF command AE SENSOR OUTPUT signal (analog) AE SENSOR BIAS signal (analog) AE SENSOR GAIN signal BLANK SOLENOID DRIVE command BLACK TONER EMPTY signal CONTROL COUNTER DRIVE command CONTROL CARD CONNECT signal CASSETTE PAPER EMPTY signal CASSETTE IN signal CASSETTE SIZE signal 0 CASSETTE SIZE signal 1 CASSETTE SIZE signal 2 CASSETTE SIZE signal 3 CASSETTE SIZE signal 4 CT-UNIT DETECTION signal DC BIAS CONTROL command FAN MOTOR 1 DRIVE command FAN MOTOR 2 DRIVE command FAN MOTOR 3 DRIVE command GRIDE BIAS CONTROL signal GRID ON signal HEATER DRIVE command HVTON command LAMP ON command LIGHT signal LENS HOME POSITION signal LIGHT INTENSITY CONTROL command LENS SOLENOID DRIVE command MULTIFEEDER CLUTCH DRIVE command MULTIFEEDER PAPER DETECTION signal MULTIFEEDER SOLENOID DRIVE command MAIN MOTOR DRIVE command PAPER DETECTION signal 1 (Q2) PAPER DETECTION signal 2 (Q5) PRE-EXPOSURE LAMP LINT command PICK-UP ROLLER CLUTCH SOLENOID DRIVE command REGISTRATION ROLLER CLUTCH SOLENOID DRIVE command RIGHT DOOR CLOSE signal SCANNER HOME POSITION signal TOTAL COUNTER DRIVE command TONER EMPTY signal FIXING ROLLER SURFACE TEMPERATURE signal (analog) ZERO CROSS DETECTION signal AE ROTATION INITIAL ROTATION LAST ROTATION SCANNER FORWARD SCANNER REVERSE STANDBY WARM UP WARM UP ROTATION CANON NP-1550 REV.1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) A-3 C. GENERAL CIRCUIT DIAGRAM 7 | 6 5 | 4 | 3 | 2 | 1 Transtormer N N N T1 — H H H 3 À 2)" 1213 211 Line CB! J102 J110 J101 LF1 filter y 1 ITA 112) (a 4 er/DC power supply PCB (1X2) (2) € 45 lo À | (ADF) (Sorter) | J [ J107 J108 J109 SW | SW2 Power switch 9 9 Door switch 57 4% 72 Exhaust fan LE | o Lens solenaid LJ — Scanner motor НН — Scanner | 3(0) SLA | cooling High-voltage transformer fan EMO Cassette size sensor HVT TT Zn | J801 E CST o (SW3) FM1 1 J28 a) Q 5 < = co ZE ‘1m NI — | сч Ее) | = 2 oo al © © : o < ola ao m a ol xl © Nl NNN N O|O|F1=5/9|2 = = E lz e 2136/35) 918121212 SEE ELE Sola Sal) EZ EE à 5 11213141516 1) 21) 31415 11213lal5X8l75 1 213lalsle 112 141Xx211k213 J305 J310 J307 J302 J304 J309 9311 DFREQ FN 195 DE-TXD Y” DF-SB — 5 GND EN To IC controller PCB DF-RXD_, ADF DF-ACK 3 GND > J317 J303 J313 GND | ; “2 (aX4Xs (6 718 9 lio 11) 12 De 2% 3) (56/7 {7х6 000 (2X) Je] dle dela zi ela ez Sie ge] ge {5 38 3 3128 Eb SIS HE E us > J43 1 Y >) Ca (1X2 3) e 1) J21 (>) 1 Y 2Y 3) + {2 (a 11213 112 3) J42[ 2 1} € 2 3) | J391— ® + J35 J33 J26 FM3 7 7 N 7 000 3 2X1 3 2) 1 3 21 1 3 2) 1)2)13 e 4 00 © 3 Q11 225 — Е i 1230 CNT A AA Ts) | +14 IE 5 TH1 Scanner Lens Black to Cassette Delivery counter rmister position position sensor fan sensor sensor sensor 13 | 12 | 11 10 9 | 8 | 7 | Mainmotot Tr Mi HI 1X2X3 —fa 1 va J104 J102 Fixing roller heater N TS1(F1) NN 3 > o 24 J106 AC driver/DC power s H 1 Thermo switch J4 H J103 J105 J107 1N2l3lal5l6e 5X 4X 3k 2A 1 41 3L 211 Regist- Muiti- Pre-ex lation feeder Multi- osure roller Pick-up AE Richt clutch feeder bam clutch clutch Blank Pre-regist- Multi- door solenoid p 1 $olenvid solenoid J601 ration feeder h J С С] paper paper switc Lamp regu CJ sensor sensor 1603 1 + UA SW4| | CL2| | SL3 CLi SL1 SL4 eYsYaYa XX) XX) CX) | 2% 2X1) J23 J24 J27 00 J731 J29 O J22 Ve 1) 2 DE 2Y 1) J36 2Y 1) 2 Y 1) J30 4 J25 x (2X3) (eXsXe) (7X6) (2 Xn о J205:0XXs) (7X6 Xs) (4X3) (2X1) 5 H = ala ale ol al ello ol la с | 15 o||3 ml o < lo ol © ale EE = |= E e RE SÉ 26 36 El SÉ dead eE EN ' 1 2x3) (а 5Х в) (7 в) O0 @ 12—12) (за) (56) (7 8 12X33 4) 5L6 1} 2 alal5 1121314 | J312 J308 J301 J306 J30£ J3517% SORT-ACK > SORT-RXD To 2 sorter | sota DC controller 7 SORT-TXD > SORT-REQ J314 J315 J316 1 Y aYaX5X5X7 8 50€ 12113114 1 Y aX 1Xs 6171819 DE 3 as 6 7X8) a) 10) 1 ala ol | el es) 218] d & N a BIKE ES 95H 584944994996 2 z E | Xx) É| ¥| ¥| Y | Y XI Y | {zZ | = | =| © DN | 0) u MN | Wl of of of of Я ще o un | © 7 5 3 x a | ol | © O à © a ся > 5 Di 7 и M 1 35000000 0¢ of 2 13114 1 2 XaXaXs 6 Y XI—1 2 OE 1 6X 00C 11 Ja J503 J501 J502 Control panel J506 J505 J35 ! Y 312 Q3 F112 TH1 Scanr (NTC1) home Thermister positic senso Copy density knob Power indicator Control card COPYRIGHT E) 1992 CANON INC. CANON NP-1550 REV.! SEPT 1932 PRINTED IN JAPAN (PRIME AU JAPON) PAO PA1 PAZ PA3 PA4 PAS PAG PA7 PBO PB1 PB? PB3 PB4 PB5 PB6 PB7 PCO PC1 PC? PC3 PC4 PC5 PC6 PC7 /NMI INTI R354 R385 R319 R318 XT2 XT1 VS5 Q342 || COPYRIGHT © 1992 CANONINC. CANON NP-1550 REVO JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) MODE1 /RESET MODEO R321 AVCC VREF VDD PD7 PD6 PD5 PD4 PD3 PD2 PD' PDO PF7 PF6 PF5 PF4 PF3 PF2 PFI PFO ALE /WR /RD ANY AN6 AN5 AN4 AN3 AN? AN1 AÑO R380 << R381 <C R382 D307 D313 || 7 D. DC CONTROLLER CIRCUIT DIAGRAM | DC CONTROLLER PCB (1/5) R315 Q339 329 D335 VR300 — AEGIN GRID-VR VR301 [GND-B GND-B еее сене a I : || 1 C362 | CIO | C358 | C356 DC CONTROLLER PCB (2/5) 1 deb 7 RA308 Mr 5V RA307 PDP2 ENERGY-SAVING > | | UNLATCH | SCLK ç SIN SOUT P CS E MFPD о | | SW300 C318 D324 ‘R326 | AVA . TOT-TEST ¿res D325 R327 T C317 — COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV.O JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) 5V J J FW A - |- | Q320C — R308= = 14,13 BPA4 —= C304 озо9 8 R310 | ÉR312 <ACBON }- < / 0349 Q320D | 1 | | Q320F R314 13 14 | AN pao1 SHYTON] NT | Q320E eg GEL Bem Q321E | R368 Te 12, 5_ Biv BPD4 A R302 20303 J WWW — — + 24VB 7 ну ©3110 > Q322A Rass oa — - 16: 1 BPD1 10 <INSD | AM ; GND- Q322C | HTDG 14 3 me BPD2 | Y ' /MR MFSD e | @355 Q352 BPD3 D331 R367 24VB | AN-BIAS-CAP . NY BPAS GND-B 1, Y | Q320B } т C301 BPA6 R359 BPF7 24AVB—e + 24VB = 03% 70837 [GND-B}—e . [5] N N 5V MR Q338 R363 | 1 C336 C338 _ [ко | PERE cose 1 Q357 BPF6 os = R320 : 36VA GND-B | _. [seval + ‘ X — | \ ао | - GND-A 1 $ — | [7] GND-B | | | COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV.1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) { CRRNT-ENBL 11 6 BPC4 24VB D312 DC CONTROLLER PCB (3/5) 7 MR Q311A 2 TCNT-PRES < LAON | BLSD i | | | BPrs PS 4 18 ‚= | y О RGCD | Q322D | R376 : BPF3 7 10 „=== | YW o PUSD 24VB i Q321G i | | @s20G ; 10,17 BPCS Q358 / < R339 un a | v ZD302 | g Q321A 16 1 R372 BPDs { CCNNT_ О A VBG 8 03218 пан -—— 15 2 BPF4 VE D WW | | | | ‘DC CONTROLLER PCB (4/5) | | | ! e 36VA | Q304 x I 4 A337 КО] ZD801 R341 | Q336 — AM em" - Oy ' H | Ков C307 N = > т 1 Hals Q308 20300 | wT [FT TOO | вевз | VV 1 <comA 4 6 AE T d+ Al LL N B Eo DRVA | _ cata C306 BPB2 |:05 518 5 | — Q351 R332 B DRVB т ВЕ | DRVB + | Te | HOLD come HZ, __ ça29 — caso STEP-ON се му TT T X ——— BPB1 NN RR + + COM-B | — Q353 R333 DD AB | = 335 oe 3 13 ! ) PO BV < | BPBO = R329 < R328 9 Q354 R334 > 52.9 E R351 BPB6 ST | | J J AM BPC6 R338: о! N F 0307 777 SCHP =R350 > R349 R348 | УМУ [scHP >— | R352 BPB7 эссе | НР > — Por _- . “> = dot | Tm BPB4 = [PoP — | est esto [caoe R353" = FTE | T 1 | Cea 5V ' = 5V 5V , RA302 | R346 347 | 19 ©3050 SORT-ACK DB ” В | DF-ACK > | SORT-RXD > DF-RXD Q305C Ms BPC2- + 1 { SORT-REQ} oA al 8" SORT-TXD So Q310A , | { DF-TXD] 3 | COPYRIGHT © 1992 CANON INC. CANON NP-1550 REVO JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) | 13 DF-REQ 1 a 12 COPYRIGHT © 1952 CANON INC. 5V 5\ 5V | us | eo 2) | eo 3) C343 C349 C350 J301 CANON NP-1550 REVO JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) ENERGY-SAVING KR7: KRE' KR5, КВА! KR3| KR1 KRO! KS2 KS1 — |Kso CCNTD CCNNT | | KR2D | co — Го Canon» | с. w — + On =) q14 (Q318) F———2 C333 I— un < (0319) C334 GND THI GND SCHP 5V GND LHP 5V AEGIN AE GND-B 24VB — 1 2 3 4 5 6 7 8 9 [ со Za Oo SOSIIARENT — c с — > SEC N — © : DC CONTROLLER PCB (5/5) SV (Q310) C354 J351 SORT-REQO——4 1 SORT-TXD > —« 2 SORT-SB A ——93 Cu SORT-RXD )—5 SORT-ACK 46 с o n N еб Кем E. AE SENSOR CIRCUIT DIAGRAM +24VA L | 24VA 4 O 1701 | | | c701 | | Le GNOS | | | + 07701 i — | Û _ | + 2 | _ | 7 | I | \ | R701 A703 | VW VW - | 4 В +24VA = - | oN o > + +24VA au < с N S R705 Q AAA + A710 AE | ANN -0%u701 j c708 = | +24VA г | - | | 1 | © | o +24VA | a т a j 5 - E =; | AE-GAIN 014701 COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV.0 JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) F. AC DRIVER / DC POWER | | SUPPLY CIRCUIT DIAGRAM - — _ __ Di et. o o LL Lo OL _ _ 5 LI Enr - _ Tt So TTL III I E II TINOITL | | D109 | ZXDP | | 24V « 5V Wi | R112 Q102 | R103 1 L101 MM | VD 1 — IN OUT J105 J1 02 1 lc | |2 В i CURRENT CHECK 1 ; 4 |o la 3 le eo Q101 R109 113 AC OFF > To 8 y E E EU TEL з ¡DC ? D— я! Е Ss ET = o 4 |CONTROLLER VS A с D GND 16 | О 5 9 T N 0 15 | B101 TON GND | © ano E | 13 я с в R142 C122 Eds 5 u 6 sf | C110 = C111 C112 —— — E Ss 5 L Р T — — C101 F c C Y | — — —— = C102 | C108 1 1 1 8 2 | | | | i 3 7 8 | | ; R106 R110 C103 R104 С105 | C107 | = 24V 5V 36V 1103 C104 A La R105 | QQ 2 T | 11 D104] C109 vd? oc 4 4 : 777 | T | 20 5 |CONTROLLER j 6 | 777 | Q103 | 24V ? MMD ‚ 1136 | R143 D110 _|D111 ay a _| 6118 | Q108 x YA" Q104 — | CURRENT CHECK ; , | D112 4 i + — D113 | R132 | + Y |: : R134 6 3 [6117 = 24V | + = = R144 J106 \ , a ; 1 —20 ; [a J110 J108 J109 J104 = | - Q107 о о © о о J107 HTRD , R136 R137 1 [213 1 |e 1 | 1 [2 13 my — C115 2 5 Ni 5 Q105 ea: Ya 4 — + * R139 F101 | 1 J101 en | о! ст 2 | R138 C119 О | AC LINE | | COPYRIGHT © 1982 CANON INC. CANON NP:1550 REV SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) ) | | | G. PRE-EXPOSURE LAMP CIRCUI DIAGRAM | | | | | T lo J731 PEXP LA731 LA732 LA733 LA734 3 9 LA735 LA736 O LA737 © LA73 R731 ААА R732 © © © 2 © 4731 24V COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV.O JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) H. HVT CIRCUIT DIAGTRAM > = bas PE = Е = = à со E © à = = Е а cou a ad d om © bg A By y VW 2 = wr © в = = = Lu Е = a E [15] E o a Г 33 © cs = ru п А - 15 21.5V — VCC uo m 0 oo = a 3 1 a a I a 1 I = 1 = | с J „=й № А | ут У basses od m = © a 5 = un 2 I od = e E © = e E o al e ë = = = 5230009 ame X Er oo = OO > œ e eu (с В +t IT oO N = Де [ео = nf Y © = 8 = | | o ST od od — > DADES Da TA A Aa srs — 5 | 2 = ——s nf FR = == Oy A emo ol mms A неее 11 Als Fr a +24 =r od a ANN + AAA УМУ CC УСС 4 | - > € AA MAR x Y "Y AAA 3 r т i 1 + 1 1 1 Z I 1 = 1 1 = 1 i [O] Sl. 1 Ww alg I & LÉ 1 I > = 1 AA 1 “i = VW 1 1 I ] + I 1 ! I I I I I 1 1 1 L 1 I ı = 1 + > 1 ‘ = o ! I sil A 5 1 1 a A A La J = [ al ALA + Y Se А Ал ] JNE с = 2 time YY AAA Ъ 8 a AAN AAA = + Vy Y y 24 € “ } 91 рен нее нее неее CANON NP-1550 REVO JAN. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) COPYRIGHT © 1992 CANON INC. |. are listed below. LIST OF SPECIAL TOOLS Special tools which are required for servicing this copier (in addition to the standard tool. set) No. Tool name | Tool No. Shape Code _Application/remarks 1 | Door switch | TKN-0093 A | actuator | 1 Front door | 2 | Spring scale |CK-0054 В | * Measuring strength of | (compression) cassette springs | и « Adjust scanner drive | | cable tension | 3 | Extension CK-0426 B | For removing grip rings: | | blades for 4 to 9 mm ' | pliers COPYRIGHT © 1992 CANON INC. . CANON NP-1550 REV.1 SEPT 1992 PRINTED IN JAPAN (IMPRIME AU JAPON) J. LIST OF SOLVENTS AND MATERIALS Material name Chemical formula, mix- Source No. Use Remarks ture ratio, etc. 1. | Ethyl alcohol | Cleaning: C:Hs OH Locally | Flammable. (Ethanol) copyboard Use in a well-ventilated area. isopropyl alcohol glass, mirror, (CHZs): CHOH ir concentrated (Isopropanol) 2. | MEK Removing | CHa-CO-C Hs Locally |Flammable. toner oroil | Methylethy! ketone | Use in a well-ventilated area] stains and avoid breathing concentrated vapor. Avoid contact with eyes or skin. | Do not use of cleaning the drum, plastic molded parts, or corona Wires. 3. | Heat-resistant | Lubricating the CANON | Tool No.: CK-0427 (500g grease drive can) (Equivalent grease can mechanisms, be used, but should be able e.g., copyboard | to withstand 200°C for driving gear, extended periods of time.) fixing drive gear, fixing assy, etc. | 4, | Lubricating oil | Lubrication ISO VG 68 oll Locally | Equivalent oil can be used. (low viscosity) | points: ESSO Febis K68 Tool No.: CK-0451 (100cc) Scanner rail, etc] MOBIL Vactraoil No.2 SHELL Tonna oil T68 | . 5. | Lubricating oil | Lubrication ISO VG 220 oil Locally | Equivalent oil can be used. (low viscosity) point: one-way | ESSO Febis K220 Tool No.: CK-0524 (100сс) clutch in pick-up] MOBIL Vactraoil No.4 | control | assembly A-18 COPYRIGHT © 1992 CANON INC. CANON NP-1550 REV1 SEPT. 1992 PRINTED IN JAPAN (IMPRIME AU JAPON)

Canon NP 1550 copier SERVICE MANUAL

Assistant Bot

Key Features

Frequently Answers and Questions

What is the maximum copy size for the Canon NP1550 copier?

What type of paper can be used in the Canon NP1550 copier?

What is the maximum number of copies that can be made in a single run?

Can I make two-sided copies on the Canon NP1550 copier?

Can I make overlay copies on the Canon NP1550 copier?

How do I adjust the copy density on the Canon NP1550 copier?

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Table of contents

Canon NP 1550 copier SERVICE MANUAL

Assistant Bot

Key Features

Frequently Answers and Questions

What is the maximum copy size for the Canon NP1550 copier?

What type of paper can be used in the Canon NP1550 copier?

What is the maximum number of copies that can be made in a single run?

Can I make two-sided copies on the Canon NP1550 copier?

Can I make overlay copies on the Canon NP1550 copier?

How do I adjust the copy density on the Canon NP1550 copier?

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