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Panasonic FP-7742 Service Manual

Panasonic FP-7742 Service Manual

Plain paper copier
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Download this manual See also: Service Manual, Operating Manual
ORDER NO. OED9607317C1
Service Manual
Plain Paper Copier
FP-7742/7750
(General)
© 1996 Matsushita Electric Industrial Co., Ltd.
All rights reserved. Unauthorized copying and
distribution is a violation of law.

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Summary of Contents for Panasonic FP-7742

  • Page 1 ORDER NO. OED9607317C1 Service Manual Plain Paper Copier FP-7742/7750 (General) © 1996 Matsushita Electric Industrial Co., Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law.
  • Page 2 This manual was developed and is supplied to authorized servicing dealers by Panasonic Communications & System Co. for the sole purpose of providing information necessary for the equipment's proper support. It is intended that this information be confidential and may not be reproduced without prior written consent from Panasonic Communications &...

  • Page 3: Table Of Contents

    Contents / Index I. Introduction 1.1 Specification ..................1-1 1.2 Features .................... 1-3 1.3 System Configuration ............... 1-4 1.4 Operation ..................1-7 1.5 Component Location ................. 1-8 1.6 Copy Process ................. 1-10 1.7 Precautions on Set Up ..............1-11 1.8 Precautions with Consumables ............1-12 II.
  • Page 4 Caution: Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommended by the manufacturer. Dispose of used batteries according to the manufacture's instructions.

  • Page 5: Introduction

    : 50 cpm 42 cpm 6.First copy time [FP-7750] 2.9 sec.(Letter/A4 size/Without Auto mode) 3.6 sec.(Letter/A4 size/With Auto mode) [FP-7742] 3.0 sec.(Letter/A4 size/Without Auto mode) 3.8 sec.(Letter/A4 size/With Auto mode) 7.Copy ratio Enlargement(fixed) : 2.00, 1.55, 1.29, 1.21 Reduction (fixed) : 0.79, 0.77, 0.65, 0.61, 0.50...
  • Page 6 AC120V 60Hz / AC220 - 240V 50Hz 23.9" × 26.0" × 22.9" / 606 ×661 × 582 mm 21.Dimensions(W)(D)(H) 22.Weight 161 lbs (FP-7742), 161.5 lbs (FP-7750) / 74kg Temperature : 50–86F/10–30 °C 23.Ambient conditions Relative humidity : 30–80% 24.Optional accessories...

  • Page 7: Features

    • Enhancements in serviceability If trouble happens, the self diagnosis mechanism illustrates the area for easy service. • Standard Automatic Duplexing(FP-7742/7750) An Automatic Duplex Unit is provided standard, in addition to front paper loading (550 sheets) + Multiple sheet bypass (50 sheets).

  • Page 8: System Configuration

    1. 3 FP-7742/7750 System Configuration i-ADF FP-7742/7750 Sorter 20 bin/ 20 bin staple Paper drawer System console Cover 3000 Storage FP-7742/7750 Main Unit & Accessories Main Unit FP-7742/7750 i-ADF FA-A888 FA-A505 System console FA-DS82 Paper drawer FA-MA055 FA-MA301 20 bin sorter...
  • Page 9 <Commonality of accessories> Accessories FP-7718 FP-7722 FP-7728 FP-7735 FP-7742 FP-7750 FA-DS72 System FA-DS82 console LCC ( FA-MA301 ) Number of drawer 1 + ADU 1 + ADU Copier paper feed Auto Duplex unit Option Option Option Standard Standard i-ADF 10bin sorter...
  • Page 10 120K 120K 120K 120K Department counter Cover, Interleaving, Presentation Job memory This Service Manual is based on the FP-7742/7750. To identify areas where the other models differ, please refer to this chart and the Field Service Manual for each model.

  • Page 11: Operation

    1. 4 Operation Energy Saver Interrupt Key Reset Key Press to reset all User Preset Key Touch Panel Display Manual Key features to initial power-on state. Ready Indicator Clear/Stop Key Multi Size Original Size Quantity Keys Ready: Green LED Press to stop copy run Keys Not ready: Red LED or clear copy count in...

  • Page 12: Component Location

    1. 5 Component Location ( Outer view ) Control panel Paper exit Bypass cover Power switch Paper feed cover ADU (Automatic duplex unit) Front cover Paper drawer/tray...

  • Page 13: Inner View

    ( Inner view ) 6 7 38 8 9 10 11 12 Half-speed unit 20 Paper feed roller Full-speed unit 21 DFP roller Lens Position sensor 22 Pick-up roller Thermistor 23 ADU Paper feed roller AE Sensor 24 Corona cleaner Main motor 25 Transfer/Separation corona Lens unit...

  • Page 14: Copy Process

    1. 6 Copy Process –DC Charger Discharge lamp Blacking prevention Trimming Reduction Discharge Exposure Original Cleaning Developer Toner Transfer Separation Fusing Exit Paper feed Primary Charge: Image Exposure: Developing: Latent charge image(–) Illumination Charge corona Toner (+) Drum Magnetic Latent roller charge Drum surface...

  • Page 15: Precautions On Set Up

    1. 7 Precautions on Set Up Copy machine performance and the copy quality is subject to and dependant on environmental conditions. To maintain good performance, quality, and safe operation, observe the following precautions: 1) Do not install the system under the following conditions to operate safely and avoid trouble.

  • Page 16: Precautions With Consumables

    1. 8 Precautions with Consumables Photoreceptor drum • Do not touch the surface (with the hand or any thing else). • Stand the drum with the drum gear up for storage. • Be careful not to smear with saliva, water, oil and so on. •...
  • Page 17 • There are normally no special problems with storage and transport in a cold climate but, store in a low humidity condition. Do not put supplies near heaters. 5) Safety and hygiene Toner has the property of easily being wind blown. Toner on skin does not cause any damage to health but, inhaling it is undesirable even if a powder is simply dust.

  • Page 18: New Function

    Section II New Function 2. 1 Image Control (Quantum Technology) • Even if the toner density is at it's standard level, the copy image may vary with time depending on the characteristics of drum and the environmental variations. To prevent this change, the copy density sensor which is installed under the developer unit controls the image to stablize the copy image.
  • Page 19 • Quantum Technology is applied at the following intervals. a) During initialization after turning on the power. b) After every 1,000 sheets following execution of Quantum Technology (But, every 200 sheets following the execution of F8-09 for the next 500 sheets) c) After turning on the power (up to 200 copies) d) After replacing the toner bottle (up to 200 copies) •...

  • Page 20: Toner Density Control

    2. 2 Toner Density Control To keep toner density(toner carrier ratio) in the developer unit constant, the TDC sensor (toner density sensor) which is installed under the developer unit detects the amount of carrier in the developer unit to control the toner density. <Fundamentals>...
  • Page 21 2) Maintain standard toner density While checking the output voltage of the TDC sensor for every copy, control the timing of toner supply to the developer unit so that the output voltage is 2.5V at all times to keep the toner density constant. Check TDC sensor output voltage at copying (or mixing).

  • Page 22: Trouble Avoidance Mechanism

    2. 3 Trouble Avoidance Mechanism When some malfunction happens, this mechanism allows regular copy operation without error conditions (service man call) (providing the malfunction does not affect the basic copying operation and the appropriate function is not selected). <Indication> Appropriate function selected Appropriate function not selected The selected function is unavailable, Normal indication of copying...
  • Page 23 <Self-recovery item> Item Error code Copier paper feed ( upper ) E2-01 Copier Paper feed ( lower ) E2-02 System stand paper feed ( upper ) E2-03 System stand paper feed ( middle ) E2-04 System stand paper feed ( lower ) E2-05 System stand paper feed timing E2-10...

  • Page 24: Etp System -Evaluative Toner Processing

    2. 4 ETP System -Evaluative Toner Processing To maximize the number of copies which can be produced for each bottle, toner cleaned off of the drum needs to be returned to the developer for re-use. Under normal circumstances, the copy process can damage some toner. In addition, other undesireable materials may be cleared from the drum surface and mixed with re- useable toner (such as paper dust, etc.).

  • Page 25: Re-Try Control For Paper Misfeed

    2. 5 Re-try Control for Paper Misfeed • Copy paper should pass the paper feed sensor within a specific time after the paper feed clutch turns on. To reduce paper misfeeds due to a slipping paper feed roller, the paper feed clutch turns on again (re-try operation). •...

  • Page 26: Sub Assemblies

    Section III Sub Assemblies 3.1 Main Drive The driving mechanism of this machine is as follows. Main motor Fuser unit Pulley 1 Pulley 2 Transport roller Magnetic Bypass roller unit Drum Registration roller Paper feed unit Middle roller Middle gear Middle roller Paper feed unit (Lower stage) Name of motor...

  • Page 27: Operation

    3. 2 Operation Sheet bypass paper feed 1) Construction of the sheet bypass paper feed unit The construction of the sheet bypass paper feed unit consists of a sheet bypass paper feed roller, transfer roller, paper pass sensor, DFP roller, and timing roller.
  • Page 28 2) Operation of sheet bypass paper feed unit • When choosing the sheet bypass tray and pressing Print, the revolution of the main motor is transmitted to the transmission gear via respective driving gears. Consequently, drive is transmitted to the timing roller gear of the sheet bypass paper feed unit.
  • Page 29 Main motor Pulley 1 Pulley 2 Paper feed roller Cleaning sheet DFP roller Sheet Paper pass bypass Paper sensor unit detecting sensor Registration Middle roller roller Middle gear Pick-up roller Registration (upper) roller clutch Solenoid Registration Middle roller (lower) roller gear Middle gear Clutch gear Clutch...

  • Page 30: Paper Feed Unit

    Paper feed unit 1) Construction of paper feed unit • The construction of paper feed unit is as follows. Part description Functions Paper transfer roller Transfer the paper from paper feed cassette. Paper feed roller Feed the paper. Paper feed solenoid Drive the paper to paper transfer roller.
  • Page 31 2) Paper feed unit operation • By pressing the Print key, the electromagnetic clutch turns on, and the revolution of the main motor is transmitted to the idle gear through respective gears and belt. The idle gear which is connected to the middle roller gear rotates.
  • Page 32 3) Paper drawer lift mechanism • When inserting the paper drawer, the lift lever connects with the coupling which drives the the machine side lift lever. Next, the lift motor rotates, and it's drive is transmitted to the lift lever driving gear via respective gears, and rotates the lift lever to lift up the drawer bottom plate.

  • Page 33: Developer Unit

    Developer unit 1) Construction of the developer unit • The developer unit consists of the magnet roller, sleeve, transport screw and mixing mill. • The developer is mixed and charged by the transport screw and the mixing mill and is transferred on the developer sleeve. The developer on the sleeve forms a brush by the magnetic force of the magnetic roller, and makes contact with the electrostatic latent image on the drum.
  • Page 34 2) Developing • The developer mixing unit contains developer which is a mixture of fine powder (non-magnetic toner) and fine ferrite carrier. • The developer is mixed by the transport screw and the mixing mill. The toner becomes charged ( + ) and the carrier becomes charged ( – ). The developer is magnetically stuck on the aluminum sleeve of the magnet roller, and the magnetic brush is formed.
  • Page 35 3) Driving developer • The revolution of the main motor is transmitted to the developer drive gear via respective gears and belt. The developer is connected to the main body with the gear. The sleeve gear is connected with the mixing mill gear and the transport screw gear to mix and transfer the developer.
  • Page 36 4) Installing/removing the developer unit • Turning the developer release lever on the right side of the main body, the cam rotates which presses the spacer ring of developer to the drum surface. Accordingly, the developer is separated from the drum. 3-11...
  • Page 37 5) TDC sensor • TDC sensor which is installed under the developer transport screw is an inductance type sensor is used to detect the ratio of toner to carrier in the developer. The sensor measures changes of magnetic flux density, and monitors the toner density in this way.
  • Page 38 7) Drum cleaning • After developing and transferring, the toner remaining on the drum is cleaned away by the cleaning blade. • The cleaning blade touches the drum surface with a specific pressure using the blade pressure spring, and cleans the toner off of the drum surface. •...

  • Page 39: Toner Hopper Unit

    Toner hopper unit 1) Construction of the toner hopper • The construction of the toner hopper is as follows. Part description Function Toner bottle Supply toner. Home position sensor Detect the home position of toner bottle. Reserve tank After storing toner in toner hopper, supply to developer mixing unit.
  • Page 40 2) Supplying toner The toner hopper unit supplies toner to the reserve tank by turning the toner bottle. • When the TDC sensor in the developer unit detects lower toner density the toner hopper motor (stepping motor)operates and rotates the toner supply roller to supply toner to the developer mixing unit, from the reserve tank.
  • Page 41 3) Toner level detection • When the toner level sensor in the toner hopper detects no toner remaining, and does not detect toner after continuously turning the toner bottle "Add toner" is displayed. The copier is disabled. The machine can be used after the user's key input. After lighting the no toner indication, the machine stops after 300 copies.

  • Page 42: Paper Transport Unit And Separation Unit

    Paper transport unit and separation unit 1) Paper transport unit The paper transport unit transports the paper after transfer/separation. Paper is secured by the suction fan and transferred to the fuser using the transfer belt. • The paper transport unit is driven by the main motor which is transmitted to the paper transport drive gear via respective drive gears.
  • Page 43 2) Operation of the separation finger After transfering the image on the drum to the paper with the transfer corona, the paper is separated from the drum by the separation corona. The separation finger is provided to ensure the separation of paper from the drum.

  • Page 44: Fuser Unit

    Fuser unit 1) Construction of the fuser • The construction of the fuser is as follows. Part description Function Heat roller Fuse toner on paper by applying heat. (Aluminum + Teflon coating) Pressure roller Fuse toner on paper by pressing paper to heat roller. (Silicone rubber + Fluorine plastic tube) Cleaning web Clean off heat roller with non-woven cloth...
  • Page 45 2) Fusing The fuser unit makes the image permanent by fusing the toner with the heat of heat roller and the pressure of pressure roller. • The upper heat roller of the fuser unit is excellent in toner release characteristics and has applied a treatment to enhance the durability and antistatic nature of the finish.
  • Page 46 Cleaning web roller Web drive gear Heat roller Web connecting gear Pressure roller Heat roller bearing Paper exit sensor lever Heat roller gear Fuser lamp Fuser coupling gear Middle gear 3) Driving of fuser unit • For fuser drive, the main motor revolution is transmitted to respective gears and then to the heat roller via the fuser coupling gear to drive the heat roller.
  • Page 47 5) Temperature control The heat roller is provided with two halogen lamps (main heater lamp and sub heater lamp). The main heater lamp turns ON during warming up and copying operation. To control the maximum power consumption, the sub heater lamp turns ON during warming up and after release of pre-heat mode only in order to reduce the warming up time of fuser unit.
  • Page 48 Paper exit selection guide ADU guide roller Paper exit roller Solenoid 6) Exit/2 sided copy switching • The paper transferred from the fuser unit either exits by the paper exit selection guide or is transferred to the ADU. The switching solenoid mounted on the copier frame operates the paper exit selection guide via a switching lever.

  • Page 49: Optics Unit

    Optics unit 1) Construction of optics unit • The optics unit consists of exposure lamp, lens and reflector mirrors mounted on fixed as well as scanning assemblies. It uses a slit exposure method that scans the original with the full-speed unit and forms the image on the drum. •...
  • Page 50 2) Driving optics unit • The optics unit (full-speed unit and half-speed unit)is driven by the optics unit motor. The optics unit motor revolution drives the full-speed unit and half-speed unit via optics unit motor belt, full-speed half-speed drive pulley, full-speed unit drive belt and half-speed unit drive belt.
  • Page 51 3) Zoom up/down The following operations are required for zoom. a) Changing the optical path length between lens and mirrors b) Setting the scanning speed of optics system c) Setting luminous exposure d) Lighting blacking prevention lamp (prevent black belt at both ends in zoom down) a) Changing the optical path length between lens and mirror •...
  • Page 52 • Lens movement Stepping motor Lens drive gear/pulley Drive belt Lens unit Forward Lens position Slide rail direction Lens home detecting plate position sensor Reverse direction • Mirror movement Forward direction No. 4/5 mirror Reverse direction Mirror position detecting plate Mirror drive gear Mirror drive rack Stepping motor...
  • Page 53 b) Setting the scanning speed of optics system The copy ratio in the paper feed direction is changed by changing the scanning speed of the optics system full-speed unit. • For reduction, the optical image guided by the mirror and lens is reduced on the drum in the direction of drum shaft.
  • Page 54 d) Lighting blacking prevention lamp (black belt at both ends) • In reduction, both ends of drum surface are not lit by the exposure lamp, and these areas forms black, which is increase in toner consumption. The both ends of blacking prevention lamp (LED) are selectively lit to prevent blacking.
  • Page 55 4) Optics system initialization • The positioning of the optics system is determined by turning on/off the optics home position sensor (which is mounted at left side of copier frame), with the position detecting plate which is installed on the full-speed unit. •...
  • Page 56 5) Optics system operation when print key is pressed a) Pre-scanning • Pressing the print key lights the exposure lamp and starts the main motor. • For automatic exposure mode, After a specified time, the optics motor rotates, and the optics unit (full-speed unit and half-speed unit) start to scan.
  • Page 57 6) Automatic detection of original paper size • Opening the platen cover by approx. 30 degrees to insert the original, the platen cover angle sensor turns on and four original size detection sensors operate simultaneously. • The original size detection sensors consists of light emission unit and light reception unit.

  • Page 58: Automatic Duplex Unit (Adu)

    Automatic duplex unit (ADU) 1) Component location 14 13 1. Paper pass sensor A 14. Paper weight lever 2. Paper width guide 15. Drive motor 3. Connector 16. Magnetic clutch 4. ADU tray detecting sensor 17. Clutch gear 5. Paper width guide home position 18.
  • Page 59 2) Mechanical operation 1 Paper stack/paper return operation When the drive motor rotates counterclockwise and turns gear 6 and the timing pully, the transfer roller rotates and paper is transported onto the transfer guide 2. At the same time the magnetic clutch turns ON and the storage roller rotates, paper is reversed and stored in the ADU.
  • Page 60 3 Paper width guide operation When the paper width guide motor rotates and turns the timing belt, the paper width guides align paper. Operation timing for the paper width guide is shown below. 1)When the power switch turns ON: Move to Letter-R/A4R size position, after detecting paper width guide home position sensor.
  • Page 61 3)Operation flow chart Power switch ON Paper in ADU? Paper detected in ADU before power OFF? (Check memory for paper in ADU) Paper width/length guide no operation “Remove paper in ADU” indication Press reset key, paper feed out Jam indication Remove jam paper Open/close front door Allow paper width/length guide to Letter-R size...

  • Page 62: Preventive Maintenance

    Section IV Preventive Maintenance The periodic maintenance service is performed by machine cleaning and parts replacements. It is essential to perform these service activities properly for customer satisfacation. The purpose of this service is to maintain the machine performance and the copy quality.

  • Page 63: Cleaning Method

    4.2 Cleaning Method • Cleaning method for each PM service visit is shown below.
  • Page 64 Cleaning position Tool/solvent Work/precaution 1 Sheet bypass paper - Use IPA, if foner is stuck on the Cloth with transfer roller rollers. (As little as possible.) water / IPA - Do not use cleaning cotton. 2 Sheet bypass paper feed roller 3 Timing roller 4 Middle roller 5 Paper feed roller...
  • Page 65 Cleaning position Tool/solvent Work/precaution 17 Mirror (No.1 ~ 6) Blower - Clean with soft touch, otherwise, brush / the mirror surface may get Glass damaged cleaning - Clean with soft paper and IPA as 18 Lens paper with required. 19 Original size detecting Blower - Clean the dust on the sensor sensor...

  • Page 66: Disassembly And Re-Assembly

    4. 3 Disassembly and Re-assembly PM parts replacement procedure • The replacement procedure of PM parts is as shown below. The replacement cycle of PM parts is shown for the FP-7750/7742. (For other models, refer to the correct Service Manual.) Multi-feed bypass Fuser Unit...
  • Page 67 Multi-feed bypass Part name Item Cycle 1 Pick up roller 120K 2 Paper feed roller 120K 3 DFP roller 120K 4 Torque limiter 1200K 5 Registration roller 1080K 6 Registration roller 1080K bearing 5, 6 7 Cleaning sheet 600K SV107 Caution Magnet clutch Hook...
  • Page 68 1) Replacement of the pick-up roller/paper feed roller (1)Remove the screws and covers. (x 2) (2)Disconnect the harness. (3)Remove the bypass tray. Note: Remove right cover (2 screws). (1)Remove the touch ring. (2)Remove the paper stopper. (3)Remove the sensor lever. (4)Remove the touch ring.
  • Page 69 3) Replacement of the registration roller and cleaning sheet 1) Remove the right cover and rear cover. 2) Open the front cover. a) Open the waste toner bottle cover and remove the bottle. b) Turn the toner hopper 180°. 3) Pull and turn the developer release knob. 4) Remove the drum unit.
  • Page 70 (2) Paper feed unit Part name Item Cycle 1 Paper feed roller 120K 2 Pick-up roller 120K 3 DFP roller 120K 4 Torque limiter 1200K 5 Middle roller 1080K...
  • Page 71 1) Replacement of the paper feed roller and the Pick-up roller 1) Remove the right cover and rear cover. 2) Open the copier paper feed cover. 3) Remove the paper feed cover stopper. Note: Move the stopper to the larger hole remove.
  • Page 72 2) Replacement of the DFP roller and the torque limiter 1) Conduct the procedure 1 and 2. 2) Remove the lower roller cover (2 screws) 3) Remove the touch ring. 4) Remove the DFP roller. 5) Remove the torque limiter. Note: Make sure the direction of the torque limiter when re-installing it.
  • Page 73 120K 4 Corona 360K 5 Developer 120K 6 Spacer ring (F) 120K 6 Spacer ring (R) 120K 7 Toner dispersion 600K prevention cover 8 Mag-roll stopper (F) 600K 8 Mag-roll stopper (R) 600K 9 Drum separation 360K finger (FP-7742/7750) 4-12...
  • Page 74 1) Replacement of the cleaning blade 1) Open the front cover. 2) Move the toner hopper to front side. 3) Pull and turn the developer release lever and release the developer unit. (Refer to p. 4–8 step 4) 1) Remove the drum unit solenoid cover (1 screw).
  • Page 75 2) Replacement of the Drum / Side seal 1) Conduct the procedure 1 and 2 and take the drum unit out. 2) Remove the drum cleaning blade tension spring (refer to P.4-13 step 4). Remove the front side screw on the drum shaft. 4) Remove the drum shaft.
  • Page 76 4) Replacement of the developer 1) Conduct the procedure 1 and 2 2) Remove the developer unit and remove the mixer lid. 3) Dump the developer out of the unit. 4) Vacuum any developer on mag-roller and inside of the unit. 5) Remove the developer unit duct cover and clean inside of duct cover.
  • Page 77 6) Replacement of the toner dispersion prevention cover/magnetic roller stopper • Conduct procedure 1 and 2 then pull out the developer unit. (1)Remove the screws (x 2). (2)Remove the toner dispersion prevention cover. (3)Remove the magnetic roller stoppers (front/rear) and replace the magnetic roller.

  • Page 78: Fuser Unit

    (4) Fuser unit Item Cycle Part name 1 Cleaning web roller 120K 2 Web pressure roller 1200K 3 Fuser lamp 240K 4 Heat roller 360K 5 Heat roller bearing 600K 6 Insulating bushing 360K 7 Heat roller gear 600K 8 Thermistor 240K 9 Separation finger (upper)
  • Page 79 1) Replacement of cleaning web/web pressure roller (1) Open the front cover. (2) Swing the toner hopper to the right. (3) Remove the fuser unit manual paper feed knob. (1 screw reverse threaded) (4) Remove the front cover. a) Remove the band. b) Slide out the hinge pins.
  • Page 80 2) Replacement of the fuser lamp/heat roller/heat roller bearing/insulating bushing/ heat roller gear • Conduct procedure 1and 2. (1)Remove the screws (x 4) (2)Remove the heat insulating cover. Note: Either loosen pressure screws (x 2) or install fuser shipping screws (x 2). (1)Remove the springs.
  • Page 81 3) Replacement of the thermistor • Conduct procedure 5. (3)(4) Remove the screw. (5)Remove the thermistor. • Replace the thermistor. SV507 4) Replacement of the separation finger (upper/lower) (1)Open the fuser exit cover. (2)Remove the screws (x 2). (3)Remove the separation finger (upper) bracket.
  • Page 82 (1)Remove the spring (x 2). (2)Turn the separation fingers and remove them (x 5). SV506 5) Replacement of the pressure roller/roller bearing • Remove the heat roller (refer to step 5 to • Remove the separation finger upper/lower brackets (refer to 10 and 12). Mark the current height adjustment to use as a reference during re-assembly.

  • Page 83: Optics Unit

    (5) Optics unit Item Part name Cycle 1 Exposure lamp 120K 2 Filter A 120K 2 Filter B 120K 3 Optics filter 120K 4 Full speed unit drive belt 5 Half speed unit drive belt 6 Optics drive belt : As required 4-22...
  • Page 84 1) Replacement of the exposure lamp Remove upper covers (left/right). (1)Remove the screws (x 3). (2)Remove the original guide. (3)Remove the platen glass. (4)Move the full speed unit to the right. SV601 (1)Remove the screws (x 2). (2)Remove the main reflector. Remove the exposure lamp and replace 4-23...
  • Page 85 2) Replacement of filter A and B. Replacement of the optics fan filter • Conduct the procedure 1. Remove both left and right copier side cover. • Peel off the dust prevention filter and stick new one with the double face adhesive tape on it.
  • Page 86 3) Replacement of the optics motor belt/full-speed unit drive belt/half speed unit drive belt (1)Remove the platen cover (or ADF/i-ADF if installed). (2)Remove the copier front cover (refer to page 4-18 step 1). (3)Disconnect the lattice connectors of any options (System Console and LCC). (4)Remove the rear cover (7 screws).
  • Page 87 Remove the left side control panel ass’y bracket. (1 screw). (1)Remove the ADF lattice connector bracket (5 screws). (2)Remove the optics motor tension spring. (3)Remove the left ADF hinge receiving bracket/key counter receptacle bracket (3 screws). (4)Remove the optics drive motor (3 screws). SV630 (5)Remove the optics drive motor belt.
  • Page 88 Move the full-speed unit to right until it stops. (1)Remove the 2 screws on the full-speed unit support (each side). (2) Remove the full-speed unit belt fixing plate (each side). (1)Loosen the four idler pulley brackets (2 screws each). (2)Remove the four optics drive belt tension springs.
  • Page 89 Disconnect the drive belts from both sides of the half-speed unit. Loosen the hex screws and remove the E rings in the optics drive shaft pulleys (each side). (1)Remove the E rings (each side). (2)Remove the bearings (each side). (3)Slide the optics drive shaft to the rear, and remove it.
  • Page 90 Connect the full-speed unit drive belt (1) Install the belt fixing plate on the full-speed unit drive belt (each side). (2) Move the full-speed unit to right until it stops. (3) Tighten screws on the full-speed belt fixing plate. (each side) SV616 Connect the half-speed unit drive belt (1) Move the half-speed unit to right until it...

  • Page 91: Automatic Duplex Unit (Adu)

    (6) Automatic duplex unit (ADU) Cycle Item Part name 1 Paper feed roller 2 Storage roller 3 F/R mylar 4 Paper feed pad 5 DFP roller 4-30...
  • Page 92 1) Replacement of the paper feed roller/storage roller/F/R mylar/feed roller pad (1) Pull out the ADU until it stops. (2) Remove the upper cover (2 screws). (3) Lift the transport guides (1 and 2). (1) Remove the screws (x 2). (2) Remove the stopper plate.
  • Page 93 • Conduct procedure 1 and 2. • Peel off the paper feed pad and replace Replacement of the DFP roller • Conduct procedure 1. (1)Remove the screws (x 2). (2)Remove the DFP roller block. (1)Remove the touch rings (x 2). (2)Remove the bearing.

  • Page 94: Main Body

    (7) Main body Part name Cycle Item 1 Corona cleaner 120K 2 Transfer wire 120K 3 Separation wire 120K 4 Ozone filter 240K 5 Ozone filters 240K 6 Dust collecting filter 240K (Main body) 7 Transfer chager 360K 4 7 3 1 2 8 Discharge lamp 240K 4-33...
  • Page 95 1) Replacement of the charger wire/wire cleaner felt (1)Open the front cover. (2)Turn the transport lever and lower the transport unit. (3)Press down the transfer charger and draw it toward you. • Remove the transfer charger. (1)Remove the paper guide. (2)Remove the charger cover.
  • Page 96 2) Remove the suction fan and the ozone filter to replace them with new ones. (1)Remove the rear cover. (2)Replace the ozone filter. (Rear side) (Left side) Ozone filters (3)Replace the filters. • Open the front cover. • Remove the exit cover. (2 screws, more if sorter-equipped).

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Fp-7750

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