Sharp AL-1000 Service Manual

Digital copier

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Page 1 AL-1000/1010 SERVICE MANUAL CODE:00ZAL1000/A1E DIGITAL COPIER AL-1000 AL-1010 MODEL CONTENTS [ 1 ] GENERAL..........1 – 1 [ 2 ] SPECIFICATIONS .
Page 2 AL-1000/1010 CAUTION This product is a class 1 laser product that complies with 21CFR 1040.10 and 1040.11 of the CDRH standard and IEC825. This means that this machine does not produce hazardous laser radiation. The use of controls, adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.
Page 3 AL-1000/1010 At the production line, the output power Caution of the scanner unit is adjusted to 0.57 This product contains a low power laser MILLI-WATT PLUS 20 PCTS and is device. To ensure continued safety do not maintained constant by the operation of remove any cover or attempt to gain access the Automatic Power Control (APC).
Page 4: Table Of Contents
AL-1000/1010 CONTENTS Optical section ....... . . 8-3 [1] GENERAL Fusing section .
Page 5: Model
AL-1000/1010 [1] GENERAL 4. Environmental The environmental conditions for assuring the copy quality and 1. General the machine operations are as follows: This model is a digital personal copier produced with key words (1) Normal operating condition of “Comfort able copy, Clear copy, Easy copy” providing high copy performances and copy productivity.
Page 6: Specifications
AL-1000/1010 [2] SPECIFICATIONS 1. Basic Specifications item type Desktop Copy system Dry, electrostatic Segment (class) Digital personal copier External dimensions (W × D × H) H293 × W518 × D445mm (mm) Weight Approx. 43.3lbs (19.6kg), TD and drum cartridges included 2.
Page 7 AL-1000/1010 Section, item Details Exit way Face down Paper exit section Capacity of 100 sheets output tray Original set Center Registration (left edge) Max. original B4 (10″ × 14″) size Originals Original kinds sheet, book Original size None detection Scanning system...
Page 8: Copy Performance
AL-1000/1010 3. Copy performance Section, item Details Fixed magnification 3R + 2E (AB system : 50, 70, 81, 100, 141, 200%) ratios (Inch system : 50, 64, 78, 129, 100, 200%) Copy magnification Zooming 50 ∼ 200% (151 steps in 1% increments)
Page 9: Others
AL-1000/1010 4. Others Section, item Remark Can be set or canceled with user Toner save mode simulation. Additional Can be set or canceled with user Pre-heat mode function simulation. Can be set or canceled with user Auto power shut off mode simulation.
Page 10: Consumable Parts
AL-1000/1010 [3] CONSUMABLE PARTS 1. Supply system table Common to all destinations Name Content Life Product name Package × 1 Toner/developer cartridge Develop cartridge (Black) × 1 (Toner: Net weight 220g) AL-100TD (5% document) (Developer: Net weight 190g) Drum cartirdge...
Page 11: External Views And Internal Structure
AL-1000/1010 [4] EXTERNAL VIEWS AND INTERNAL STRUCTURES 1. Appearance (10) (11) (12) (13) Original table Original cover Side cover Operation panel Front cover Paper tray Side cover open button Paper guides Handle (10) Paper output tray (11) Paper output tray extension...
Page 12 AL-1000/1010 2. Operational panel 200% MAX. 129% 100% 100% ZOOM MIN. (10) (11) (12) (13) Exposure mode selector key Light and dark keys and ∗1 Alarm indicators and indicators exposure indicators Copy ratio selector key and Zoom indicator Copy ratio display (%) key...
Page 13: Internal
AL-1000/1010 3. Internal TC cartridge lock release button TD cartridge Drum cartridge Drum cartridge handle Paper feed roller Fusing unit release lever Charger cleaner Transfer charger...
Page 14: Motors And Solenoids
AL-1000/1010 4. Motors and solenoids Part name Control signal Function,operation Main motor Drives the copier. Mirror motor MRMT Drives the optical mirror base (scanner unit). Toner motor Supplies toner. Cooling fan motor Cools the optical section. Resist roller solenoid Resist roller rotation control solenoid...
Page 15: Sensors And Switches
AL-1000/1010 5. Sensors and switches Name Signal Type Function Output Mirror home position Mirror (scanner unit) MHPS Transmission sensor “H” at home position sensor home position detection POD sensor Transmissions sensor Paper exitdetection “H” at paper pass Paper transport PPD2 sensor...
Page 16: Pwb Unit
AL-1000/1010 6. PWB unit Name Function Exposure lamp invertor PWB Exposure lamp (Xenon lamp) control Main PWB (MCU) Copier control Operation PWB Operation input/display Power PWB AC power input, DC voltage control, High voltage control CCD sensor PWB For image scanning...
Page 17: Cross Sectional View
AL-1000/1010 7. Cross sectional view (10) (11) (12) (13) (14) (15) Part name Function and operation Illuminates the original with the copy lamp and passes the reflected light to the lens unit Scanner unit (CCD). Exposure lamp Exposure lamp (Xenon lamp) Illuminates original Lens unit Scans the original image with the lens and the CCD.
Page 18: Unpacking And Installation
AL-1000/1010 subject to extreme temperature or humidity changes, e.g., [5] UNPACKING AND INSTALLATION near an air conditioner or heater. 1. A WORD ON COPIER INSTALLATION Improper installation may damage the copier. Please note the following during initial installation and whenever the copier is moved.
Page 19: Unpacking
AL-1000/1010 (2) Remove the CAUTION tape from the front cover and 3. UNPACKING remove the two protective pins from the fusing unit by pull- Unpack the copier and carry it to the installation location by ing the strings upward one at a time.
Page 20: Loading Copy Paper (Installing The Paper Tray)
AL-1000/1010 (7) Close the front cover and then the side cover by pressing (4) Adjust the paper guides on the paper tray to the copy paper the round projections near the side cover open button. width and length.Squeeze the lever of paper guide (A) a and slide the guide to match with the width of the paper.
Page 21: Functional Diagram
AL-1000/1010 [6] Printing process An OPC drum is used for the photoconductor. (Structure of the OPC drum layers) OPC layer (20microns thick) Pigment layer (0.2 to 0.3 microns thick) Aluminium drum (1) Functional diagram Main charger Laser beam Cleaning blade...
Page 22: Outline Of Print Process
AL-1000/1010 (2) Outline of print process Semiconductor laser This printer is a non-impact printer that uses a semiconductor laser and electrostatic print process. This printer uses an OPC (Organic Photo Conductor) for its photoconductive material. First, voltage from the main corona unit charges the drum sur- face and a latent image is formed on the drum surface using a laser beam.
Page 23 AL-1000/1010 Step-7: Optical discharge (Semiconductor laser) Non-image area Before the drum rotation is stopped, the semiconductor laser is -600 radiated onto the drum to reduce the electrical resistance in the OPC layer and elimate residual charge, providing a uniform state to the drum surface for the next page to be printed.
Page 24 AL-1000/1010 Start 1) Because the grid potential is at a low level, the drum poten- tial is at about –400V. (Carrier may not be attracted though the carrier is pulled towards the drum by the electrostatic force of –400V. 2) Developing bias ( –400V) is applied when the photoconduc- tor potential is switched from LOW to HIGH.
Page 25: Operational Descriptions
AL-1000/1010 [7] OPERATIONAL DESCRIPTIONS (1) Outline of operation The outline of operation is described referring to the basic configuration. (Basic configuration) Scanner section Operation section MCU (Main control/image process section) LSU (Laser unit) Laser diode, Polygon mirror lens Laser beam...
Page 26: Scanner Section
AL-1000/1010 Sub scanning direction (2) Scanner section Sensor scanning area 1) How to scan documents The scanner has sensors that are arranged in a line. These sensors Main scanning scan a certain area of a document at a time and deliver outputs se- direction quentially.
Page 27: Laser Unit
AL-1000/1010 2) Laser beam path (3) Laser unit The image data sent from the MCU (image process circuit) is sent to the LSU (laser unit), where it is converted into laser beams. 1) Basic structure The LSU unit is the writing section of the digital optical system.
Page 28: Fuser Section
AL-1000/1010 B. Separator pawl Fuser section Three separator pawls are used on the upper heat roller. The separator pawls are teflon coated to reduce friction with the roller and prevent a smear on the paper caused by the separator pawl.
Page 29: Paper Feed Section And Paper Transport Section
AL-1000/1010 Paper feed section and paper transport section 1. Paper transport path and general operations (10) (11) (12) (13) (14) (15) Scanner unit Main charger (11) Pickup roller Copy lamp Heat roller (12) Manual paper feed tray Lens unit Pressure roller...
Page 30 AL-1000/1010 3. After about 0.1 sec from when the main motor start rotating, 6. To release the resist roller, the tray paper feed solenoid and the tray paper feed solenoid (PFS) turns on at a moment. the resist solenoid are turned on by the paper start signal to...
Page 31 AL-1000/1010 3. When pawl C of the manual paper feed clutch sleeve is B. Manual multi paper feed operation hung on the manual feed latch, the manual feed stopper 1. Before paper feed operation, the manual paper feed falls and the manual take-up roller rises. At that time, the solenoid (MPFS) is turned OFF as shown in the figure manual paper feed roller is rotating.
Page 32: Process Unit New Drum Detection Mechanism
AL-1000/1010 5. The solenoid turns off to close the gate and return to the in- Process unit new drum detection itial state. mechanism 1. When the power is turned on, the detection gear 38T is rotated in the arrow direction by the detection gear 20T to...
Page 33: Operation Panel
AL-1000/1010 (2) Push up the lock pawls (2 positions) of the side cover, and [8] DISASSEMBLY AND ASSEMBLY remove the transfer charger. Before disassembly, be sure to disconnect the power cord for Lock pawl rear safety. The disassembly and assembly procedures are described for the following sections: 1.
Page 34 AL-1000/1010 D. Charger wire cleaning E. Charger wire replacement (1) Remove the charger cleaner from the manual paper feed (1) Remove the TC cover and remove the screw. unit. (2) Remove the spring and remove the charger wire. (3) Install a new charger wire by reversing the procedures (1) and (2).
Page 35: Operation Panel Section
AL-1000/1010 C. Assembly procedure 2. Operation panel section For assembly, reverse the disassembly procedure A. List 3. Optical section Part name Ref. page A. List Operation panel unit Operation PWB Part name Ref. page Copy lamp unit B. Disassembly procedure Copy lamp (1) Remove the screws (4 pcs.), the harness, and the opera-...
Page 36 AL-1000/1010 (2) Remove the screws (2pcs.), and remove the copy lamp (5) Remove the screws (2 pcs.), the harness, and the optical unit from the mirror base drive wire. unit. When installing the lens unit, refer to “9-7. Lens unit installation reference.”...
Page 37: Fusing Section
AL-1000/1010 (4) Remove the screw and remove the U-turn guide. 4. Fusing section A. List Part name Ref. page Thermistor PPD2 sensor Heater lamp Pressure roller Heat roller B. Disassembly procedure (1) Remove the connectors (3 pcs.) of the rear cabinet.
Page 38 AL-1000/1010 (7) Remove the plate spring on the right and remove the (10) Remove the pressure release levers on the right and the heater lamp. left sides. (11) Remove the pressure roller, the pressure bearing, and the pring. Hearter lamp...
Page 39: Tray Paper Feed/Transport Section
AL-1000/1010 (6) Remove the C-ring and the fusing bearing, and remove the 5. Tray paper feed/transport section heat roller. A. List Part name Ref. page PPD1 sensor PWB 8-11 Heat roller LSU unit 8-10 Intermediate frame unit 8-10 Paper feed roller 8-11 B.
Page 40 AL-1000/1010 (3) Remove two screws and remove the toner motor. (5) Remove the pulleys on the both sides and remove the paper exit roller. (4) Remove two springs and open the intermediate frame unit. (6) Pull out the paper exit roller knob and remove the belt.
Page 41 AL-1000/1010 (7) Release the belt pulley (a) lock and remove the belt pulley (9) Remove the harness guide. bearing. (10) Remove five screws and remove the main drive plate and the belt. (8) Remove the paper exit roller. CAUTION:Attach the gears...
Page 42 AL-1000/1010 (11) Remove the parts as shown below, and remove the pres- (13) Remove two screws and remove the fusing connector. sure release solenoid and the paper feed solenoid. (14) Remove five screws and the connector, and lift the inter- mediate frame unit to remove.
Page 43 AL-1000/1010 (17) Remove three screws and remove the TC front paper (19) Remove two E-rings and remove the paper feed roller. guide. (20) Remove three E-rings and remove the clutch unit. Back Clutch unit Paper feed roller Front (18) Remove the screw and the connector, and remove the PPD1 sensor PWB.
Page 44: Manual Paper Feed Section
AL-1000/1010 (2) Remove the screw and remove the side door detection 6. Manual paper feed section unit. A. List Part name Ref. page Manual transport roller 8-15 Cassette detection switch 8-13 PPD1 sensor PWB 8-13 Side door detection unit 8-12 B.
Page 45 AL-1000/1010 (4) Remove the PPD1 sensor PWB. (6) Remove the cassette detection switch. Wire treatment Wire treatment (5) Remove the E-ring and remove the manual paper feed transport roller. (7) Remove the multi cover. Multi cover 8-13...
Page 46 AL-1000/1010 (3) Remove three screws and remove the multi paper feed Multi unit upper frame. (1) Remove the screw and remove the multi upper cover. (4) Remove two screws and remove the multi feed bracket unit from the multi paper feed upper frame.
Page 47 AL-1000/1010 (5) Remove three E-rings and remove the manual paper feed (7) Cut the binding band and remove the multi paper feed roller B9. solenoid. Multi paper feed solnoid (6) Remove the pick-up roller. C. Assembly procedure For assembly, reverse the disassembly procedure.
Page 48: Rear Frame Section
AL-1000/1010 (3) Remove two screws and one harness, and remove the 7. Rear frame section main motor. A. List Part name Ref. page Mirror motor 8-16 Main motor 8-16 Exhaust fan motor 8-16 B. Disassembly procedure (1) Remove three screws and remove the rear cabinet.
Page 49: Power Section
AL-1000/1010 C. Assembly procedure 8. Power section For assembly, reverse the disassembly procedure. A. List Part name Ref. page Power PWB 8-17 B. Disassembly procedure (1) Remove two screws and one connector, and remove the power PWB. 8-17...
Page 50: Adjustments
AL-1000/1010 IV. Adjustment procedure [9] Adjustment 1) Remove the right cabinet (manual paper feed unit), the 1. Optical section document reference plate. (1) Image distortion adjustment 2) Remove the document glass. There are following two types of image distortion. Horizontal image distortion...
Page 51 AL-1000/1010 7) Manually turn the copy lamp unit/No.2/3 mirror unit drive gear to bring No.2/3 mirror unit into contact with the positioning plate, and perform the procedure of step 4). Repeat procedures of steps 4) to 7) until the parallelism of No.2/3 mirror unit is properly set.
Page 52 AL-1000/1010 10) Check the horizontal image distortion. b. Vertical image distortion adjustment If LL = LR, there is no horizontal distortion I. Summary In this adjustment, the left and right balance is adjusted by LL and LR: Distance between the copy changing the left and right balance of the No.
Page 53: Copy Magnification Ratio Adjustment
AL-1000/1010 3) If the right-left distortion balance is improper, loosen the a. Outline fixing screw of No.2/3 mirror unit rail to change and ad- The main scanning (front/rear) direction magnification ratio just the right-left balance of No.2/3 mirror unit rail.
Page 54 AL-1000/1010 2) Set the copy magnification ratio to 100%. 5) Calculate the main scanning direction magnification ratio. Main scanning direction magnification ratio ⁄ ″ × 11″ paper. 3) Make a copy on A4 or 8 Copy image dimensions × 100 (%) 4) Measure the length of the copied scale image.
Page 55: Lens Unit Attachment Reference
AL-1000/1010 Original (Scale) HARDDENCD STAINLESS JAPAN 1/2mm Shizuoka Paper feed HARDDENCD direction STAINLESS JAPAN 1/2mm Shizuoka Comparison point Reference Copy 4) Measure the length of the copied scale image. (3) Lens unit attachment reference Attach the lens unit so that the lens unit number on the lens ad- 5) Calculate the sub scanning direction copy magnification justment plate is aligned with the scribe line on the base plate.
Page 56: Image Position Adjustment
AL-1000/1010 4) Measure the image loss amount (R mm) of the scale image. (4) Image position adjustment Set C = 10 × R (mm). (Example: Set the value of C to 30.) There are following five kinds of image position adjustments,...
Page 57: Copy Density Adjustment
AL-1000/1010 4) If the measurement value is out of the specified range, 2. Copy density adjustment change the set value and repeat the adjustment procedure. (1) Copy density adjustment timing The default value is 50. The copy density adjustment must be performed in the follow- ing cases: 3.
Page 58: Features Of Copy Density Adjustment
“4” is slightly mode lamp ON copied. (3) Make a copy. Check the adjustment level (shown in the above table) of the exposure test chart (Sharp Gray Scale). Test chart Sharp Gray Scale adjustment level Non toner save mode Slightly copied.
Page 59: High Voltage Adjustment
AL-1000/1010 (2) DV bias adjustment 3. High voltage adjustment Note: (1) Main charger (Grid bias) A digital multi meter with internal resistance of 1GΩ Note: must be use for correct adjustment. Use a digital multi meter with internal resistance of 10MΩ...
Page 60: Simulation,Trouble Codes
AL-1000/1010 [10] SIMULATION , TROUBLE CODES 1.Entering the simulation mode To enter the serviceman simulation mode, press the keys as follows: Clear → Density select → Clear → Density select To cancel the simulation mode, press the clear key. Flow chart o entering the simulation mode...
Page 61: List Of Simulation
AL-1000/1010 2. List of simulation Main code Sub code Content Scanner unit operation check Operation panel display lamps operation check Fusing lamp and cooling fan operation check Copy lamp operation check Paper feed solenoids (CPFS1, CPFS2, MPFS) operation check Resist solenoid (RRS) operation check...
Page 62: Contents Of Simulations
AL-1000/1010 3. Contents of simulations Main code Sub code Contents Scanner unit operation check (Operation/Procedure) 1. When this simulation is executed, the mirror home position is detected. Sensor name display lamp Mirror home position sensor OPC drum cartridge replacement lamp 2, When the _START key is pressed, scanning is executed at the speed corresponding to the currently set copy magnification ratio.
Page 63 AL-1000/1010 Main code Sub code Contents Developing bias check (Operation/Procedure) When the START key is pressed, the developing bias is outputted for 30 sec. Main charger (Grid high output mode) check (Operation/Procedure) When the START key is pressed, the main charger output is supplied for 30 sec in the grid voltage HIGH mode.
Page 64 AL-1000/1010 Main code Sub code Contents Drum counter clear (Operation/Procedure) When the START key is pressed, the drum counter value is reset to 0. Scanner counter clear (Operation/Procedure) When the START key is pressed, the scanner counter value is reset to 0.
Page 65 AL-1000/1010 Main code Main code Contents Rear edge void setting (Operation/Procedure) 1. When this simulation is executed, the currently set code number of rear edge void setting is displayed. 2. Enter the code number of rear edge void setting and press the START key, and the setting will be changed.
Page 66 AL-1000/1010 Main code Main code Main code Paper sensor status display (Operation/Procedure) The paper sensor status is displayed on the copy quantity display. Sensor name Display lamp Resist front paper sensor(PPD1) Developing lamp replacement lamp Fusing section paper sensor (PPD2)
Page 67 AL-1000/1010 Main code Main code Main code Relationship between the displayed values and the GAMMA ADJUST register Exp1 Exp2 Exp3 Exp4 Exp5 TEXT PHOTO The value displayed after execution of this simulation can be set in the range of 0 - 99 with 50 as the center value.
Page 68 AL-1000/1010 Main code Sub code Contents Lead edge position and paper lead edge/rear edge void adjustment Used to adjust the copy image position on copy paper and the lead edge/rear edge void amounts. Performed by adjusting the scanning start position and print start position (resist roller ON timing) in 100%.
Page 69 AL-1000/1010 Main code Sub code Contents * Machine with the multi manual paper feed unit installed Adjustment mode Lamps ON Main cassette paper feed AE, main cassette lamp 2nd cassette paper feed AE, 2nd cassette lamp Manual paper feed AE, manual feed lamp...
Page 70: Trouble Codes
AL-1000/1010 4. Trouble Codes Main code Sub code Trouble content Detail of trouble HSYNC cannot be LSU (laser diode, reception element, APC circuit) trouble detected. LSU drive circuit (ASIC) trouble CCD drive circuit (CCD PWB, ASIC harness) trouble CCD white level trouble...
Page 71: Function Which Can Be Set With The User Program
AL-1000/1010 [11] USER PROGRAM The conditions of factory setting can be changed according to the use conditions. Functions which can be set with the user program Function Contents Factory setting When a certain time is passed after completion of copying, this function returns to the Auto clear.
Page 72: Electrical Section
AL-1000/1010 [12] ELECTRICAL SECTION 1. Block diagram A. Overall block diagram MCU PWB JITTER SRAM Toner Motor SYNC IC Reference ASIC Printed LASER Visual Data UART Other Loads Other Inputs MHPS DVSEL MIRROR MOTOR MAIN PPD1 PPD2 MOTOR MMLD MHPS...
Page 73 AL-1000/1010 B. Main PWB block diagram (Load drive block diagram) 12-2...
Page 74: Circuit Descriptions
AL-1000/1010 2. Circuit descriptions A. Maiin PWB (MCU) (1) CPU signal table CPU pin table Model without SPF PIN No Signal code Input/output Operating /CS1 Output Chip Select for SRAM /CS0 Output Chip Select for EPROM D-GND D-GND Output Address Bus (NC-pull up)
Page 75 AL-1000/1010 PIN No Signal code Input/output Operating Data input/output Data Bus Data input/output Data Bus Data input/output Data Bus Data input/output Data Bus Data input/output Data Bus Data input/output Data Bus Data input/output Data Bus Data input/output Data Bus D-GND...
Page 76 AL-1000/1010 PIN No Signal code Input/output Operating SELIN3 Output Input select 3 SELIN2 Output Input select 2 SELIN1 Output Input select 1 Output Power relay control PR Output Resist roller solenoid RPC D-GND D-GND SCLK Output Clock Line for EEPROM...
Page 77: Asic
AL-1000/1010 (2) ASIC 1. Outline Fig. 4 shows the block diagram of the ASIC. The ASIC is composed of the following three blocks; the image process section, the print control section, and the I/F section. The image process section processes the image data from the CCD PWB according to the operation mode, such as shading, AE process, resolution conversion.
Page 78 AL-1000/1010 2. ASIC input/output PIN No. Signal name IN/OUT Connected to Description /SCANSP CPU (I/O) Scanner process interrupt signal /PRSTART Print start trigger signal TMON Toner motor ON/OFF TMCLK Toner motor reference clock 3.3v Power CPUAD7 CPU address bus CPUAD6...
Page 79 AL-1000/1010 PIN No. Signal name IN/OUT Connected to Description MAD2 DRAM Address bus of DRAM (page memory) MAD3 DRAM Address bus of DRAM (page memory) MAD4 DRAM Address bus of DRAM (page memory) MAD5 DRAM Address bus of DRAM (page memory)
Page 80 AL-1000/1010 PIN No. Signal name IN/OUT Connected to Description Electronic sort /ESPRD (Not used) board Power Electronic sort /ESREQ (Not used) board Electronic sort /ESACK (Not used) board Electronic sort /ESCS (Not used) board PARAD0 IN/OUT 1284CN board (Not used)
Page 81 AL-1000/1010 PIN No. Signal name IN/OUT Connected to Description Power SRAM SD17 IN/OUT Data line to SRAM before are separation (separation) SRAM SOE1 Read enable line to SRAM before area separation (separation) SRAM SWE1 Write enable line to SRAM before area separation...
Page 82 AL-1000/1010 PIN No. Signal name IN/OUT Connected to Description SRAM SAD10 Address line to SRAM before area separation (separation) SRAM SAD11 Address line to SRAM before area separation (separation) SRAM SAD12 Address line to SRAM before area separation (separation) SRAM...
Page 83 AL-1000/1010 PIN No. Signal name IN/OUT Connected to Description PORTOUT20 (Not used) OP-LATCH Tr array IC Latch signal for operation circuit. Data latch at LOW. MRPS2 Tr array IC Mirror speed control signal. Mirror speed 2 at LOW. MRPS1 Tr array IC Mirror speed control signal.
Page 84: Reset Circuit
AL-1000/1010 PIN No. Signal name IN/OUT Connected to Description /CPUWR CPU write signal /CPURD CPU read signal Power CPUCLK CPU system clock Power TEST AUTO SCAN High: Normal Low: Test PORT1 TEST /SCANST CPU (I/O) Scanner process start signal (3) Reset circuit This circuit detects ON/OFF of power to control start/stop of each circuit.
Page 85: Heater Lamp Control Circuit
AL-1000/1010 (4) Heater lamp control circuit (1) Outline The heater lamp control circuit detects the heat roller surface temperature and converts in into a voltage level, which is in- putted to the CPU analog input pin. The CPU converts the analog voltage into a digital signal level...
Page 86: Driver Circuit (Solenoid)
AL-1000/1010 The lower the heat roller surface temperature is, the greater the (6) Toner supply motor drive circuit thermistor resistance is, and vise versa. The IC101 is the motor control IC, which generates the pseudo Therefore, the lower the heat roller surface temperature is, the AC waveform with the pulse signals (TM, TM-) outputted from higher the thermistor terminal voltage is, and vise versa.
Page 87: Mirror Motor Circuit
AL-1000/1010 (8) Mirror motor circuit The mirror motor is a stepping motor, and it uses the IC118 and the constant current chopper control IC (SLA7027). For control, the CPU outputs the drive signal to the IC118 to drive the mirror motor with 1-2 phase excitement.
Page 88: Power Circuit Block Diagram
AL-1000/1010 (9) Power circuit block diagram Block diagram The power circuit is composed of the main section, the high voltage circuit, the FW signal section, and the heater lamp drive circuit. The main section directly rectifies the AC power current and switch-converts with the DC/DC convertor, and rectifies again and smoothes to form each DC power.
Page 89: Circuit Diagram
AL-1000/1010 Circuit descriptions (1) Main section a. Noise filter circuit The noise filter circuit of the DC power is composed of L and C as shown in the figure below. It reduces normal mode noises and common mode noises which come from and go to the AC line.
Page 90 AL-1000/1010 (2) FW signal The AC input voltage is full-wave rectified by D5 and D6. When the voltage is divided by resistors R18, R19, and R27 and decreased below 2.5V, the shunt regulator IC7 is turned OFF to turn OFF photo coupler PC3, and turn ON transistor Q3.
Page 91: Ccd Pwb Operational Description
AL-1000/1010 (10) Cl invertor PWB (circuit) CL (Xenon lamp) CL- (CNT) Invertor circuit and transformer Output 1.5kV (effective voltage) Input +24V Circuit description The Two transistors connected in series to the transformer are switched on/off by the control signal (CL-) from the MCU. By this switching operation, the signals are converted into switching pulses and a high frequency power is supplied to the CL (Xenon lamp) by the transformer.
Page 92: Operation Section
AL-1000/1010 The amplified CCD signal output is sent to the clamp circuit. In the clamp circuit, the black level is clamped to 2V at the BCLK signal timing by the analog switch. The clamped voltage is maintained for one line by the coupling capacitor. The clamped analog signal is impedance-converted and inputted to the AD convertor.
Page 93 AL-1000/1010 COPYRIGHT©1998 BY SHARP CORPORATION All rights reserved. Printed in Japan. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher.

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