Sharp Z-87 Service Manual
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Sharp Z-87 Service Manual

Sharp Z-87 Service Manual

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[1]
Basic specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
[2]
Operation panel and indicator functional description . . . . . . . . . . . . . . . . . . . . . . 2
[3]
Unpacking and installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
[4]
Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
[5]
Components location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
[6]
Copy process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
[7]
Paper feed and transport section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
[8]
Optical system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
[9]
Fuser section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
[10] Others . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
[11] Electrical section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
[12] Circuit diagram and time chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
[13] Actual wiring diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
[14] IC specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Parts marked with "!" is important for maintaining the safety of the set. Be sure to replace these parts with specified
ones for maintaining the safety and performance of the set.
SERVICE MANUAL
CONTENTS
SHARP CORPORATION
CODE: 00ZZ87/85IIISME
Z-87
MODEL
Z-85III
MODEL
This document has been published to be used for
after sales service only.
The contents are subject to change without notice.

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Summary of Contents for Sharp Z-87

  • Page 1: Table Of Contents

    SERVICE MANUAL CODE: 00ZZ87/85IIISME Z-87 MODEL Z-85III MODEL CONTENTS Basic specifications ..........1 Operation panel and indicator functional description .

  • Page 2: Basic Specifications

    Brown (ZT-50TD4) Paper feed system: Green (ZT-50TD5) Single cassette auto paper feed (Z-87: 250 sheets/Z-85III : 100 The term "TD cartridge" indicates "Toner Developer" cartridge. sheets) and manual paper feed Developing system: Dry-type, two-component magnetic brush development (2-com- ponent developer)

  • Page 3: Operation Panel And Indicator Functional Description

    [2] OPERATION PANEL AND INDICATOR FUNCTIONAL DESCRIPTION 1 Power switch F Auto repeat Power is turned on and off using the power switch. Upon completion of copying in the multicopy mode, the copy number previously set returns to the copy number set display. 2 Upper frame release button Use of the CLEAR key resets the number.

  • Page 4: Unpacking And Installation

    2. Installation [3] UNPACKING AND INSTALLATION Installation requirements: Please note the following requirements when installing the copier. 1. Unpacking (1) Machine Environment (1) Open the carton in the following sequence. 1 Avoid installation in direct sunlight and near a window in direct sunlight.
  • Page 5 3 Remove tape (B) and swing the exit tray down. (2) Space around the copier NOTE: Do not place any objects under the exit tray. The exit tray The copier requires at least 10cm of clearance between the rear side is linked with the fusing rollers inside the copier.
  • Page 6 9 Remove the paper cassette from the bag. • Always keep the copier horizontally. F Fan the copy paper and insert into the cassette (Z-87: maximum • 250 sheets/Z-85III : maximum 100 sheets). Adjust the paper Do not hold the extended portion (multi manual feed) in guides to the correct length and width.

  • Page 7: Supplies

    [4] SUPPLIES 1. Drum cartridge, TD cartridge Storage conditions Name Description Product name * Life Approx. (temperature and humidity) Drum cartridge x 1 Drum cartridge ZT-50DR 9,000 copies Instructions x 1 TD cartridge x 1, For USA Except USA (including developer and toner) Black ZT-50TD1 ZT-50DC1...
  • Page 8 Replacing the drum cartridge 1 Turn off the power and open the front cover. 2 Press down on the catch and pull out the TD cartridge slowly. 7 Insert the TD cartridge, then close the front cover. 8 Turn on the power and make sure that the DRUM replacement lamp is OFF.

  • Page 9: Components Location

    [5] COMPONENT LOCATION 1. External Exit tray Original cover Original table Manual feed inlet Power switch lever Power supply cord Front cover and open buttons (both Indent for carrying (paper entry side) Manual feed guide sides) Operation panel Cassette 2. Open view Copy exposure balance correction knob Drum cartridge Cleaning lever...
  • Page 10 3. Front frame side CLR PWB Drum cartridge Cleaning lever Doorswitch Toner collection container TD cartridge (interlinked with main switch) 4. Rear frame side Mirror base start position sensor Main PWB Optical system cooling fan motor (MSPS) High voltage transformer PWB Optical system drive motor Main switch lever –...
  • Page 11 5. Cross section 22 24 Discharge lamp Copy lamp Main corona No. 1 mirror No. 2/3 mirror unit OPC drum TD cartridge MG roller Toner concentration sensor Paper entry sensor (PPD) Paper feed roller B Paper feed roller A PS plate Cassette paper feed solenoid (PFS) Transfer corona Separation roller...
  • Page 12 6. Switch, sensor, solenoid, spring clutch locations Name Type Function Switch Paper entry sensor Switch Paper exit sensor SHPS Photosensor Scanner home position sensor LHPS Photosensor Lens home position sensor Switch Power switch Toner concentration sensor AE sensor Photosensor Original contrast sensor Thermistor Thermistor Upper heat roller surface temperature sensor...

  • Page 13: Copy Process

    2. Exposure [6] COPY PROCESS Light from the copy lamp, reflected from the original, is projected onto the drum surface through the lens and mirror. The resistance of the OPC layer decreases for the area exposed by the light (correspond- 1.
  • Page 14 3. Developing The electrostatic latent image in the drum surface is converted into a visible image by the toner.
  • Page 15 4. Transfer The visible image on the drum surface is transferred onto the copy paper by applying a negative charge from the transfer corona to the back of the copy paper. 5. Separation The paper is separated from the drum by the remover tape and the separation roller.
  • Page 16 Step-3: Exposure (Copy lamp, mirror, lens) 2. Image forming process steps The original image is projected through the mirror and the lens to the OPC drum by the copy lamp. Image forming: In the area where light is projected (light section of the original), the A charge is applied to the drum surface by the main corona, and the resistance in the OPC layer reduces to discharge negative charges, image of the original is exposed by the copy lamp.
  • Page 17 Step-6: Cleaning Toner remaining on the drum is collected by the cleaner blade and stored in the toner collecting container. Cleaning blabe Toner is not attracted to the non-image areas on the drum because of the developing bias. Thus, if the developing bias were to fail, the Residual toner residual charge would attract the toner so that a background would Step-7: Discharge...

  • Page 18: Paper Feed And Transport Section

    [7] PAPER FEED AND TRANSPORT SECTION 1. Paper transport route and operational description Manual multi paper feed Paper stopper plate PS plate Separation paper feed roller B Upper and lower roller heat rollers Fuser paper guide paper feed paper feed roller A roller C General Description:...
  • Page 19 2 At the moment the PRINT key is pressed, the main motor starts to 5 Meanwhile, the paper fed into the machine is transported to paper turn the drive gears. The paper feed gear also starts to be driven, feed roller B and the paper entry sensor (PPD). There, the paper but the rotation of the gear is not conveyed to the paper feed roller is held temporarily by means of the PS plate, in order to shaft and the paper feed roller does not rotate because the paper...
  • Page 20 8 The paper separated from the drum is transported to the exit tray C. Condition to establish a paper misfeed through the fuser paper guide, fuser heat roller, and the paper exit 1 At power on sensor (POD) If PPD or POD is on at power on. The following shows the timing chart for the above operation.
  • Page 21 3 Remove the E-ring, the gear, the pin and the bearing, and remove 3. Adjustments paper feed roller B. A. Paper feed roller A location (angle) 4 Remove the E-ring, the gear, the pin, the link arm, and the bear- ing, and remove paper feed roller C.

  • Page 22: Optical System

    1. General description [8] OPTICAL SYSTEM • As a fixed focus lens is used in the optical unit, magnification ratio can be varied by changing the lens position and the optical path distance by moving the positions of the mirror-4 and mirror-5. There are choices of four magnification ratios which can be at- tained by selecting the magnification ratio;...
  • Page 23 As the sensor is installed in the center of the 50 mm slit, the contrast C. Light source unit of the original is sensed within this 50 mm area. (See the shadowed 1) Copy lamp area in the figure below.) 235W for the 100 V series machine For the original out of this area, the automatic exposure control func- tion will not apply.
  • Page 24 1) Mirrors (No.4/No.5) mirror unit This unit is employed to control the optical distance by means of the cam. 2) Lens A through type fixed focus lens is used. 3) Blank lamp PWB The blank lamp PWB consists of the side lamps (SL1, 2, 3, 4) and the void lamp (VL).
  • Page 25 3. Optical system operation A. Time chart (single copy from cassette) B. Timing chart explanation 1 When the PRINT switch is pressed, the main motor rotates to rotate the drive gears. After 0.9 sec, the paper feed solenoid (PFS) turns on to start paper feed. Print switch 2 After 1.6 sec from starting paper feed, the copy lamp regulator Ready pilot lamp...
  • Page 26 4 Remove the shaft and the plate. (Scribe plate position before B. Thermal fuse removing to mark position) Refer to enlarged view. Install the thermal fuse so that it is in contact with the reflector. Exposure control plate Thermal fuse Main harness Reflector...
  • Page 27 (4) Under the above state, install the mirror base drive wire fixing (Note for reassembly) plate to the light source unit and fix the wire. • When fixing the light source unit cable with the cable clamp, refer to the white mark. White mark Cable clamp Light source unit cable...
  • Page 28 E. The No.4/5 mirror unit removal G. Optical mirror motor removal 1 Remove the table glass, left panel, and the operation panel. 1 Remove the original cover, the rear cabinet, and the table glass. 2 Draw a line to the location where the No.4/5 mirror unit shaft 2 Remove the mirror base drive wire from the drive pulley.
  • Page 29 3. Copy density adjustment procedure 5. Adjustment and hints • Set the test chart. After replacement or disassembly of any parts in the optical system, Fold an A4 (8-1/2" x 11") paper into two and put it on the check the following items: original reference position in the front frame side of the original table.
  • Page 30 C. Copy lead edge image position adjustment D. Check items for lead edge adjustment and original guide L installation This adjustment is requred in the following case: Adjust with two marks on the optical base plate which can be seen •...
  • Page 31 F. Resolution adjustment-((2)) (In case there is a resolution unbalance between the front and rear (Paper exit side) sides or blur is seen in one side of the copy) Fixing screw Check and make adjustment in the following way if there is an un- Lens hood balance between front and rear sides.
  • Page 32 I. Distortion adjustment B. Optical rail mounting position Adjustment procedure Adjust so that the optical rail can be seen at the center through the optical base plate square hole and fix with a screw. 1. Remove the operation panel, insert the screwdriver through the cut in the optical baseplate hole, and rotate the eccentric screw to Optical rail lower adjust the distortion.
  • Page 33 D. Mirror base drive wire installation (1) Fix the start point 1 of the mirror base drive wire. (2) Wind the wire along the groove inside the no. 2 and no. 3 mirror unit pulley. (UP → Down) (3) Wind the wire around the rear frame paper exit side pulley. (Up →...

  • Page 34: Fuser Section

    (Top view) [9] FUSER SECTION Electrode cover F Electrode cover R Separator pawl spring 1. General description Fuser paper guide B Thermal breaker Upper heat roller Reset button Thermistor/thermal fuse unit Fuser compartment accessing lever A. Heat roller A teflon roller is used for the upper heat roller and a silicone rubber roller is used for the lower heat roller for better toner fusing perfor- mance and paper separation.
  • Page 35 3 The self-check function comes active when one of the following 5 Remove the roller retainer, gear, bushing, and the upper heat malfunctions occurs, and an "H" is displayed on the multicopy roller. window. * Roller retainer a. When the heat roller surface temperature rises above 240°C. Bushing b.
  • Page 36 C. Heater lamp E. Thermal breaker, thermistor (thermal fuse) unit 1 Remove the heater lamp from the electrode, then carefully slide 1 Remove the upper fuser unit, and the fuser cover. out the lamp. 2 Remove the fuser paper guide B. 3 Remove the screws and the heater lamp interface wiring harness then remove the thermal breaker.

  • Page 37: Others

    NOTE: Check items after the installation [10] Others • Thermal breaker Check to see that the gap between the thermal breaker and the heat roller is 1.25 ± 0.25mm when the pressure is released (*). 1. Cabinet removal * Note A pressure is applied to the roller when the following two conditions are satisfied.
  • Page 38 (9) Remove the tapping screws which are fixing the power unit to 2. Power unit removal lower cabinet 9. Remove tap tight screws which are fixing the power unit to the (1) Open the front cabinet. frame chassis, and remove the power unit. (2) Push the open button, and lift upper frame unit 1.
  • Page 39 (5) Slide the transfer corona toward paper exit side (arrow ) and 5. Main switch mechanism and precautions remove it. The main power supply can be turned on and off with the POWER * Be careful not to touch and damage the corona wire. switch lever or opening and closing the front cover.
  • Page 40 7. Drum cartridge 8. TD cartridge General description: General description: The TD cartridge applies toner to the electrostatically charged areas The drum cartridge consists of an OPC drum, main corona, remover of the drum, and develops the latent image on the drum. The mag- tape, cleaning blade, and auger roller.

  • Page 41: Electrical Section

    [11] ELECTRICAL SECTION 1. Block diagram 2. Main PWB block diagram Driver Q2,6, Loads 5,4,3 Driver Display Swich IC13 section sensor Driver Loads (IC7) Driver Driver Driver Reset IC Loads Driver IC11 IC12 IC11 IC10 Gain select Driver – 39 –...
  • Page 42 CPU IC7 Signal Table In/Out Signal name Content MMPWM Main motor PWM drive signal Scanner motor enable signal SMCLK Scanner motor clock signal MDL0 MDL1 Panel matrix select signal MDL2 MDL3 MDL4 — Cassette paper feed solenoid control signal, ON at H (+5V) MPFS Manual paper feed solenoid control signal, ON at H (+5V) CFM1...
  • Page 43 • Sensor input matrix (Connected to 45 pin) Select signal Signal name Description Drum counter switch Paper out sense signal • Density select signal table Light Normal Dark • Drum counter Z-87/85III • Alarm display at CSW1 ON. The machine stops at CSW2 ON. – 41 –...

  • Page 44: Circuit Diagram And Time Chart

    [12] Circuit diagram and Time chart AC POWER SUPPLY CIRCUIT (100V) ..........43 DC POWER SUPPLY CIRCUIT (100V) .
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  • Page 50 MAIN P.W.B. TOP VIEW BOTTOM VIEW – 48 –...
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  • Page 52 CLR CIRCUIT CLR HIC201 INTERNAL CIRCUIT CLR P.W.B. – 50 –...
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  • Page 58: Ic Specification

    [14] IC specification M51953BL M51953A/BL M51954A/BL 1.25V IR2C07 Output Input ULN2003AN TC4066P IN/OUT1 14 VDD OUT/IN1 13 CONT1 OUT/IN2 12 CONT4 IN/OUT2 11 IN/OUT4 CONT2 10 OUT/IN4 CONT3 9 OUT/IN3 8 IN/OUT3 2B 3B 4B 5B 6B 7B (TOP VIEW) TA8428K Input Output...
  • Page 59 TA7291S Vres INPUT OUTPUT MODE OUT1 OUT1 OUT2 Stop CE/CCW Protection circuit CCW/CW OUT2 (Heat insulation) Brake : High impedance Note: Input is "H" active TC9192P Fref Phase Voltage control oscillator comparator Fsig 1/2560 Frequency divider Frequency 1/256 Frequency divider 8bit D/A divider convertor...

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Z-85 iii

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