Sharp SF-1020 Service Manual
Sharp SF-1020 Service Manual

Sharp SF-1020 Service Manual

Sharp all in one printer - copier/printer/scanner user manual
Table of Contents

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SF-1020
SF-1120
[ 1 ] PRODUCT OUTLINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 – 1
[ 2 ] PRODUCT SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 – 1
[ 3 ] PRODUCT VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 – 1
[ 4 ] UNPACKING AND INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 – 1
[ 5 ] DESCRIPTION ON EACH SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 – 1
[ 6 ] DISASSEMBLY AND ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 – 1
[ 7 ] ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 – 1
[ 8 ] SIMULATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 – 1
[ 9 ] SELF DIAGNOSTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 – 1
[10] MEMORY TROUBLES, FLOWCHART FOR REPLACEMENT OF
MAIN CONTROL PWB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 – 1
[11] MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 – 1
[12] ELECTRICAL SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 – 1
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: 00ZSF1120SM/E
SF-1020
MODEL
SF-1120
MODEL
Option
Paper tray (SF-UB15)
Two-step paper feed unit (SF-CM15)
One-step paper feed unit (SF-CM16)
Personal counter (SF-71A/71B)
10-bin sorter (SF-S17N) @
10-bin staple sorter (SF-S54) @
Auto document feeder (SF-A18) @
Reverse automatic document feeder
(SF-A57) @
@ For the options, refer to their service manuals.
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 SF-1020

  • Page 1: Service Manual

    SF-1020 SF-1120 [ 1 ] PRODUCT OUTLINE ..........1 – 1 [ 2 ] PRODUCT SPECIFICATIONS .
  • Page 2: Table Of Contents

    [1] PRODUCT OUTLINE ....1-1 1. Product features ......1-1 2.
  • Page 3 1-9. Lower paper feed roller/take-up roller . . . 6-3 2. Transport unit ......6-3 2-1.
  • Page 4 [8] SIMULATION ......8-1 1. Outline ....... . 8-1 2.
  • Page 5: Product Outline

    [1] PRODUCT OUTLINE 1. Product features (1) Compact body • Compact body size The body width of 600mm is the smallest in the class. • The employment of the front loading tray and the folding-type multi manual paper feed cassette realizes the small occupying area. 2.
  • Page 6: Product Specifications

    (Note) The copy speeds for enlargement and reduction are the lowest ones. (3) Warm up time: 45 sec or less (4) First copy time: SF-1020 5.3 sec (Paper feed port: Upper tray) SF-1120 5.8 sec (Paper feed port – from copier paper tray)
  • Page 7: Description Of Each Section

    2. Description of each section (1) Paper feed section SF-1020 Copying size A6/W letter Paper feed 2 trays + multi system manual feed Paper feed 250 sheets capacity Cassette Paper size Paper weight AB series: 80g/m Body tray Inch series:...
  • Page 8: Supply Parts

    3. Supply parts Brazil/Asia except Hong Kong Name OPC Drum kit OPC Drum Cleaner Blade Drum Separation Pawl Separation Pawl Spring Black Developer Black developer Black Toner Black Toner Bottle (240 g) Upper Heat Roller Kit Upper Heat Roller Upper Separation Pawl Fusing Bearing (F) Lower Heat Roller Kit Lower Heat Roller...
  • Page 9: Optional Specifications

    4. Optional specifications (1) Automatic document feeder (ADF) <Model name: SF-A18> Original set direction Face up Original set position Center reference Original transport system Belt (half size) system Original feed sequence Bottom taking (Face up exit) Original size A5/11" Original change speed 20 sheets/min Original weight 128g/m...
  • Page 10: Bin Staple Sorter (10-Bin Ss)

    (4) 10-bin staple sorter (10-bin SS) <Model name: SF-S54> Type Copier installation type/hanging type Distribution system Bin shift system by lead screw No. of bins 10 bins (The top bin is commonly used for non-sort. Capacity 30 sheets for each bin (A4, 8 1/2"...
  • Page 11: Product Views

    Grip Manual feed tray Power switch Developing unit grip Developing unit lock lever Drum 3 – 1 Upper unit Lower unit Name Original table Manual feed unit Operation panel Paper tray (SF-1020), Duplex tray (SF-1120) Developing unit strap Release lever...
  • Page 12: Maintenance

    2. Operation panel SF-1020 (AB series) SORTER EXPOSURE DUAL PAGE SORT COPY STAPLE MARGIN SORT SHIFT GROUP EDGE E RA SE LIGHT DARK (Inch series) SORTER EXPOSURE DUAL PAGE SORT COPY STAPLE MARGIN SORT SHIFT GROUP EDGE ERASE LIGHT DARK...
  • Page 13 SF-1120 (AB series) ORIGINAL SORTER EXPOSURE TO COPY DUAL PAGE SORT COPY EVEN NUMBER STAPLE NUMBER MARGIN SORT SHIFT GROUP PRE-COUNT EDGE ORIGINALS E RA SE LIGHT DARK (Inch series) ORIGINAL SORTER EXPOSURE T O C O P Y DUAL PAGE SORT COPY EVEN...
  • Page 14 3. Clutches, solenoids, and motors (Explained with the SF-1120 and the SF-CM15) Clutches and solenoids Signal name PSPS Paper separation solenoid Resist roller clutch Transport roller clutch CPFC1 Tray paper feed clutch (Paper is fed from the ADU in the SF-1120) CPFC2 Tray paper feed clutch CPFC3...
  • Page 15 4. PWB (Explained with the SF-1120 and the SF-CM15) Name Operation PWB A Operation input, display control Blank lamp PWB Used to control the blank lamp. Optical PWB AE sensor and lens motor interface Main PWB Used to control the body. CSD PWB Used to sense the body cassette size.
  • Page 16 Option upper tray paper size detection @1 K 4 CSD0 Option lower tray paper size detection @2 L PED1 Body upper tray paper presence detection (SF-1020 only) Transmission photo sensor HIGH when paper is present. M PED2 Body lower tray paper presence detection N PED3...
  • Page 17: Rollers, Mirrors, Etc

    6. Rollers, mirrors, etc. Name No. 3 mirror Copy lamp No. 6 mirror — Reverse roller Developing unit Photoconductor drum Resist roller Drum separation pawl Fusing thermistor Lower heat roller ‘ Tray paper feed reverse roller Transport roller (lower) follower roller Tray paper feed roller Paper feed roller @ Since...
  • Page 18: Unpacking And Installation

    [4] UNPACKING AND INSTALLATION 1. Unpacking Packing material/accessory list Name Paper exit tray Instruction manual Maintenance card Dust cover Service contract Installation manual Magnification ratio select label 2. Installation Installing conditions The surrounding conditions of the machine affect the machine perfor- mance greatly.
  • Page 19: Space Around The Machine

    5 Avoid installation to a poorly ventilated place. 6 Avoid installation to a place where there are flammable materials or ammonia gas, etc. If the machine is installed near a diazo copier, the picture quality may be degraded and malfunctions may occur.
  • Page 20: Optical System Lock Release

    3. Optical system lock release A. No. 2/3 mirror unit lock release Remove the one fixing screw of the No. 2/3 mirror unit on the left side of the copier. Mirror unit fixing screw B. Lens and No. 4/5 mirror unit lock release Remove two fixing screws of the No.
  • Page 21: Developing Unit Setting

    4 Return the electrode section to the original position and fix it with a screw. 5 Insert the main charger unit along the guide groove in the copier fully to the bottom. Main charger unit 5. Developing unit setting A. Developing unit setting 1 Open the front cabinet, remove the installation toner fixed to the developing unit level with tape, and pull the developing unit lever toward you.
  • Page 22: Toner Density Sensor Level Adjustment

    6 Hold the hand carry strap of the developing unit and insert it into the copier fully to the bottom. Developing unit 7 Close the developing unit lever and close the front cabinet. With the above procedure, setting of the developing unit is com- pleted.
  • Page 23 3 Hold the new toner bottle as shown and shake it four or five times. 4 Open the toner hopper cover. 5 Pour the toner evenly into the toner hopper. 6 Close the toner hopper cover. 7 Slide the developer unit into the copier. 8 Return the developer unit lock lever into place.
  • Page 24: Center Shift Adjustment

    9. Center shift adjustment There is basically no need to perform the center shift adjustment because it is made when shipping. If the center should be shifted, adjust in the following procedures. Make a copy. If the center is shifted as shown in Fig. 1 or Fig. 2, loosen the four screws which are fixing the cassette grip cabinet.
  • Page 25: Sf-Cm15) Installation

    11. Optional two-step paper feed unit (SF-CM15) installation Parts packed together Connection Connection Connection adjustment plate screw A screw B x 1 pc. x 2 pcs. x 1 pc. Disconnect the power plug of the copier and perform the following procedures. 1 Remove two screws which are fixing the rear cabinet on the lower stage of the copier, and remove the rear cabinet.
  • Page 26 Connect the rear side of the copier with two connection screws C. Connection screw C 6 Remove the connecter which is fixed to the rear cabinet of the two-stage paper feed unit with tape. Connect the 4P connector and 10P connector with the 4P connector and 16P connector of the copier.
  • Page 27 3. Placing the main copier unit over the paper feed unit [Note] • The following procedure should always be performed by two per- sons. Lift the main copier unit by the grips and slip the two positioning holes on the bottom of the main copier unit over the two position- ing bosses on the paper feed unit, then set the four feet on the main copier unit in their proper places on the paper feed unit.
  • Page 28: Tray Paper Size Selection

    13. Tray paper size selection (Described with the SF-1020) Select the necessary size according to the following procedures. (A5 size paper is treated as a special size. When shipping, the size is set to A3.)
  • Page 29 3. Remove the size block upward, and fit to the suitable paper size. A3 size B4 size Hole Hole Hole B5 size size Hole Hole Hole Hole A5 size When the size is changed to A5, fit Special Hole Hole the size block display to"Special."...
  • Page 30: Descriptions Of Each Section

    Use of the optional two-stage paper feed unit for the SF-CM15 (one- stage paper feed unit for the SF-CM16) and the spare tray allows a variety of system configurations. (System configuration) Example with the SF-1020: SF-1020 50 sheets 250 sheets...
  • Page 31: Developing Section

    2. Developing section 1) General descriptions (1) Two-component developer The developer is composed of toner and carrier. Carrier serves as a medium for attaching toner onto the electrostatic image on the photoconductor drum. By stirring toner and carrier, they are rubbed to be charged positive (+) and negative (–) respectively.
  • Page 32: Basic Operations

    3) Basic operations (Cassette paper feed) When the CPFC (cassette paper feed clutch) is turned on, the paper feed roller shaft, the paper feed roller, and the take-up roller rotates in the direction of A, and the roller release arm is moved downward by the limiter spring.
  • Page 33 (1) Original table The original table is fixed. The original is set in the left center position. Mirror base scan speed is changed for zooming Enlargment Copy direction (2) Copy lamp 100V series: 85V, 275W 200V series: 170V, 310W (3) Mirror This model uses six mirrors.
  • Page 34 Parts identification and functions Mirror home position sensor No. 2/3 mirror unit Reflector Copy lamp unit Lens drive wire Mirror base wire (7) Lens drive shaft This shaft controls the optical axis of the lens in zoom copy. The lens follows along the slide base shaft.
  • Page 35: Basic Operations

    (20) Original size sensing The original size is sensed by the original interruption system. The LED in the rear frame side emits light to the table glass surface. The original interrupts this light, and its size is detected. Table glass Light receiving 2.
  • Page 36 (Optical system dirt correction) This model perform dirt correction by changing the copy lamp inten- sity according to the dirt degree in the optical system (the copy lamp unit, No. 1 mirror, No.2 mirror, No.3 mirror) to prevent against remark- able degrading of copy quality.
  • Page 37: Copy Process

    (4) Copy process This model basic process and structure • The Scorotron method is used to evenly charge the photoconduc- tor surface to the given potential in the charge process. The corona wire regularly used is now replaced with a new corona charge mechanism that employs the 0.1mm thick stainless steel saw teeth plate, in order to suppress ozone generated when the oxide molecule in air is ionized.
  • Page 38: Process Diagram

    (2) Process diagram High voltage unit Main corona unit Discharge lamp Discharging Cleaning blade Cleaning Waste toner collection Separation Paper exit Fusing Separation Heat roller Separation corona unit Heater lamp High voltage unit Main corona unit Discharge lamp Cleaning blade Seperation pawl Seperation corona unit Transfer corona unit Original...
  • Page 39: Details Of Image Forming Process

    (3) Details of image forming process Step 1 (Main Charging) By negative discharging of the main charger, uniform negative char- ges are applied to the OPC drum surface. The OPC drum surface potential is controlled by the screen grid voltage to maintain the grid voltage at a constant level. •...
  • Page 40 Low intensity in Medium intensity the area corre- in the area corre- sponding to the sponding to the darker density medium density portion of the portion of the document document Aluminum layer Surface potential Surface (High) potential (Medium) Aluminum layer Step 3 (Development) Toner is attached to the latent static-electricity images on the drum surface to change them to visible images.
  • Page 41 Step 4 (Transfer) The transfer paper is charged higher than the OPC drum surface potential by strong negative discharge of the transfer charger, making the binding force between the transfer paper and toner stronger than that between the drum and toner, attracting toner to the transfer paper.
  • Page 42 Step 6 (Cleaning) Residual toner on the drum is removed by the cleaning blade. The removed toner is sent to the waste toner container by the waste toner transport screw. Blade Aluminum layer Residual toner OPC drum Step 7 (Discharging) When the OPC drum is exposed to the discharge lamp light, positive and negative charges are generated in the OPC drum CGL.
  • Page 43: Potential

    (4) Transition of photoconductor surface potential Charge Exposure -730V -215V (5) Photoconductor drum sensitivity correction In this model, fall in sensitivity due to long use of the photoconductor drum is corrected by the copy lamp light intensity to prevent against considerable change in copy quality.
  • Page 44 Process control 1 Toner patch images are formed on the photoconductor surface under the three process conditions (MC grid bias voltage). At the first process control, a toner parch image is formed with the reference grid voltage –410V as the center and second or later process control, the MC grid bias voltage deter- mined at the former process control is used as the center, and a toner patch is formed under the process condition of 32V to the...
  • Page 45: Transport/Fusing Section

    Waste toner transport The waste toner is passed through waste toner transport screw 1 and waste toner mechanism: pipe 2 to waste toner bottle 3. Waste toner bottle 3 is rotated by the main drive gear via gear 4 to transport toner evenly.
  • Page 46: High Voltage Section

    5 Drive system division The fuser unit is rotated by the main drive unit. In case of manual rotation of the fuser unit to remove paper jam, however, excessive loads may be applied to the gears. To prevent against this, the pressure of the upper/lower heat rollers is reduced when the machine clamshells are opened.
  • Page 47 2) Details of operation 1 The alignment plate and the rear edge plate detect the home positions, and moves to the paper size position. (ADU motor 1, 2, 2 Paper exit, reverse unit operation (ADU gate solenoid ON) 3 Rollers in the ADU rotate in the direction of paper entry. (ADU drive motor ON) 4 ADU paper entry detection (ADU paper entry/exit sensors 1, 2 5 ADU paper presence detection (ADU paper sensors 1, 2 ON)
  • Page 48: Disassembly And Assembly

    [6] DISASSEMBLY AND ASSEMBLY The descriptions are divided into the following sections. 1. Paper feed section 2. Transport section and power section 3. Fusing section 4. Optical system 5. SPF section 6. Drum section 7. Developing section 8. Operation panel section and intermediate cabinet 9.
  • Page 49: Ps Front Roller Ass'y

    (Note for assembly 2) When attaching the paper feed section roller ass’y, adjust so that the paper feed roller clutch and the PS front roller ass’y clutch projection face toward the paper feed side. 1-3. PS front roller ass’y Remove the paper feed unit. (For the details, refer to the 1-1.) Disengage the hook section of the front frame side bearing, remove the connector on the rear frame side, and remove the PS front roller ass’y from the paper feed frame.
  • Page 50: Lower Paper Feed Unit

    (Note for assembly) Attach the paper feed roller so that the one-way clutch is on the rear frame side. (Be careful of the direction.) Attach the roller holder as shown below. One-way clutch side 1-6. Lower paper feed unit Perform similarly for the optional two-stage paper feed unit.
  • Page 51: Transport Belt

    Remove the hook of the front frame side bearing, and lift it up to remove it toward the upper frame side. Remove the rear frame side connector, and slide and remove the resist roller ass’y toward the rear frame side. Remove the clutch and the gears as shown below.
  • Page 52: Fusing Section

    3. Fusing section 3-1. Fusing unit removal Open the front cover. Push the open/close lever down to the right side, and slowly open the upper unit. Remove the fixing screw of the fusing connector cover and remove the cover. Remove the fusing unit hanging wire from the copier frame and remove two connectors from the unit.
  • Page 53: Upper Separation Pawl Replacement

    3-4. Upper separation pawl replacement Remove the fusing unit, and remove the cover. Put the fusing unit so that the paper guide is on the lower side of the fusing unit (the separation pawl is on the upper side). Remove the tension spring, hold the separation pawl tip and remove it from the supporting section, and remove it from the unit by tilting.
  • Page 54: Thermistor/Thermostat Removal

    3-7. Thermistor/thermostat removal Remove the fusing unit. Remove the fusing cover, and remove the thermistor/thermostat. * Note for assembly • Check that the thermistor center is in contact with the heat roller. • Clean the thermistor surface with alcohol to remove foreign materials.
  • Page 55 Remove the operation panel, the upper cabinet R, and the right cabinet. Remove the dark box cover upper. Manually move mirror base B. (Within the range where the wire fixing plate fixing screw can be removed.) Remove the wire fixing plate in the front/rear frame side of the copy lamp unit, and remove the wire from the side plates F/R.
  • Page 56 Rotate the mirror base B counterclockwise to remove. Disconnect the connector from the copy lamp unit on the rear frame side and from the No. 2/3 mirror unit. Rotate the No. 2/3 mirror unit counterclockwise and remove. D. No. 2/3 mirror unit (mirror base B) assembly Reverse the above procedures.
  • Page 57: No. 2/3 Mirror Unit (Mirror Base B Installation (Mirror Base B Positioning)

    Fix the mirror base wire to the pulley with the mirror base wire fixing screw. Return the 9th winding tip of the mirror base wire to the original position. (Perform the same procedure for the front frame side and the rear frame side.) (Note) After replacing the mirror base drive wire, perform the vertical skew adjustment, the focus adjustment, and the horizontal skew adjustment.
  • Page 58: Replacement

    4) Copy lamp unit installation (Mirror base A positioning) This adjustment must be performed in the following cases: • When the mirror base drive wire is replaced. • When the mirror base A or B is replaced. • When any part in the dark box is replaced. When installing the mirror base, reverse the removal procedure of (2)-A.
  • Page 59 Remove the drive springs 4 and 5. Remove the zooming rack of the roll holder unit. Remove the lens drive shaft attachment plate. Remove the drive shafts 4 and 5. * When removing the No. 4/5 mirror unit, remember the positions (scales) of the arrow marks of the drive holder 4 and 5.
  • Page 60: Lens Wire Replacement

    6) Lens wire replacement A. Lens wire removal Remove the OR guide L and R, and remove the table glass. Remove the dark box cover upper. Remove the lens motor. Remove drive spring 4 and 5. Remove the E-ring which is fixing the roll holder drive shaft, and remove the roll holder unit.
  • Page 61 Remove the drive wire spring and the wire hook from the lens carriage boss. L drive pulley Wire hook Wire SP Remove the L pulley and the L drive pulley from the lens wire. B. Lens wire stretching 1. This procedure is performed in the following case. (1) When the lens unit is removed.
  • Page 62: Lens Unit Replacement

    Manually turn the zooming can drive gear to fit the zooming cam drive gear hole and No. 4/5 mirror drive unit base hole B. Hole Zooming cam Zooming cam drive gear Install No. 4/5 mirror drive shaft unit and the rack. * When installing the rack, be sure to fit No.
  • Page 63: Main Charger (Mc) Unit

    5. High voltage section Clean the MC case, and the TC/SC case every 50K copies. Clean the screen grid, the charging plate (saw teeth), and the TC/SC wire every 50K copies, and replace them every 100K copies. 5-1. Main charger (MC) unit Open the front cover.
  • Page 64: Unit

    5-2. Transfer/separation charger (TC/SC) unit Open the font cover, open the body up. Push TC/SC unit pawl sections (2 positions) and lift the front side and pull it out. (Cleaning/replacement and precautions) Set the charger SP length to 17 1.0mm. 17 1.0 The charger wire must be free from distortion and deformation, and must be in the wire positioning groove of each holder.
  • Page 65 6-2. Waste toner bottle replacement (required when waste toner full detection/maintenance) Take out the process unit as shown above, <Note> If the unit is removed by holding the toner transport pipe, toner is spilled. Avoid this. Remove the bottle cover. (2 screws) Rotate waste toner bearing 1 90 degrees counterclockwise.
  • Page 66: Drum (Replace Every 50K Copies)

    6-3. Drum (Replace every 50K copies) Remove the process unit from the copier. (Refer to 6-1.) Loosen two blue screws which are fixing the drum, rotate the plate slightly to the right and pull it out. Remove the drum. <Note> Be careful not to scratch the drum. 6-4.
  • Page 67: Developing Section

    6-6. Cleaner blade (Replace every 50K copies.) Remove the holder from the process unit. (3 blue screws) Remove the cleaning blade. (3 blue screws) 6-7. Drum separation pawl (Replace every 50K copies.) Slide and remove the blue pin to remove the separation pawl. Replace the star-shape washer with a new one if it is worn down.
  • Page 68: C. V Ring Attachment

    B. DB blade replacement (Replace every 120K copies.) Remove the old DV blade from the DV cover. (Remove the duplex tape.) Attach the new DV blade with the pasteboard as shown below. (Attach the DV blade to the reference of A and the inscribed line 0.2).
  • Page 69: G. Developing Unit Color Identification

    G. Developing unit color identification Color identification is made for different resistances of the developing unit. Vref (About 4.5) 6.2KF Developing unit Resistance Color Identification signal voltage (DVC) [V] (K ) Black Blue 12.0 8.Operation panel/intermediate cabinet Open the front cabinet. Remove two screws , two screws nected to the operation panel unit.
  • Page 70: Power Unit

    B. Cooling fan motor Label Reverse the removal procedures. <Note> When attaching the cooling fan motor, put the harness sec- tion and the CFm duct groove section direction, and pass the harness in the groove. Check that the fan center label is on the back when viewed from the rear of the machine.
  • Page 71: Main Pwb Unit

    9-4. Main PWB unit Remove the rear cabinet upper. Disconnect all the connectors (6 connectors) connected to the main PWB. Remove the main PWB plate (one screw). Remove the main PWB from the plate. (2 screws) 9-5. AC power PWB Remove the main PWB unit.
  • Page 72: Multi Paper Feed Unit (Sf-Mf15: Option)

    10. Multi paper feed unit (SF-MF15: option) 10-1. Separation roller Remove three screws and remove the paper feed/take-up roller ass’y. Remove the separation roller. @ When attaching the roller, engage the D-cut section with the groove. 10-2. Take-up roller/paper feed roller Remove the manual feed arm spring, the bearing stopper, and the E-ring.
  • Page 73 11. ADU <Reverse roller> Remove the extension stopper, and remove the ADU from the copier. Remove the four fixing screws (M4 8) of the ADU cover, and remove the ADU cover. Remove the six fixing screws (M4 10 = 4 pcs., M4 xc 8 = 1 pc.) of the transport frame lower unit, and remove the unit from the ADU unit.
  • Page 74 <Reverse roller> Remove three fixing screws (M4 10) of the left cabinet, and remove the left cabinet. Remove the plastic E-ring which is fixing the paper exit cabinet unit, and slide the paper exit cabinet unit in the arrow direction and remove it from the copier. Remove two fixing screws (M4, flat) of the paper exit cabinet unit and one fixing screw (M3 6) of the paper exit plate spring.
  • Page 75: Adjustment

    [7] ADJUSTMENTS 1. Developing section 1-1. Developing doctor clearance adjustment a. If the clearance between the developing doctor and the MAG roller is improper, the following trouble may occur. • Insufficient coy density • Background copy • Toner splash <Adjustment procedure> (1) Remove the developing unit from the copier.
  • Page 76: Optical System

    (5) Measure the distance from the marking position to the bottom (A) of the developing unit and check that the distance is 17.6mm. If the distance is not as specified above, loosen the MG adjustment plate fixing screw, move the adjustment plate in the arrow directions and perform procedures (3) to (5) again.
  • Page 77: Note For Adjustments

    2-2. Note for adjustments 1. Only the exposure balance adjustment, the blank lamp adjust- ment, and the copy lead edge adjustment can be performed individually. For the other adjustments, follow the flowchart below. 1. Mechanical reference position adjustment (without copying) A.
  • Page 78: Adjustment Of Each Section

    2-3. Adjustment of each section A. Lens reference position adjustment In this model, the reference value according to each lens charac- teristics must be entered. With this value, the lens home position is determined. <Procedure> (1) Execute simulation 48-01 • Perform the following key operation.
  • Page 79: Adjustment

    (3) Check to confirm the lens value specified on the lens value label. (4) Insert a screwdriver into hole (P) in the right rear side (paper feed side) of the optical base plate, and adjust the adjustment screw. The scale on the zoom base at section Q in the figure below determines the position of the No.
  • Page 80 (4) Calculate the copy magnification ratio. Copy image size Copy magnification ratio = Original size (5) Check that the obtained copy magnification ratio is within the specified range (100 0.8%). If it is within the specified range, go to procedure (7). If not, execute simulation 48-1. •...
  • Page 81 No.4/5 mirror adjustment screw 1scale: 1mm direction direction Example: In the case of O.L value +1.0, this position is the reference position. (2) Turn off/on the power to initialize the lens and No. 4/5 mirror unit. Check the focus in the normal ratio. (3) If the focus is improper, perform the focus adjustment of the normal ratio as follows: (3)-1 Make a copy of the test chart on an A4 or 8 1/2...
  • Page 82: Adjustment

    E. Horizontal copy magnification ratio adjustment a. This adjustment is performed to meet the displayed magnifica- tion ratio with the actual one. b. This adjustment must be performed in the following cases: • When the main PWB is replaced. • When the EEPROM in the main PWB is replaced.
  • Page 83: Simulation Input Values

    F. Comparison table of lens values and simulation input values Zoom correction Lens (Enlargement) display Sim 48-01 Sim 48-01 — % Sim 48-01 — % — value +4.0 +3.9 +3.8 +3.7 +3.6 +3.5 +3.4 +3.3 +3.2 +3.1 +3.0 +2.9 +2.8 +2.7 +2.6 +2.5...
  • Page 84: H. Horizontal Skew Adjustment

    G. Vertical skew adjustment a. This adjustment is performed when a skew copy is made as shown below or when a part of the mirror base drive wire or the No. 1/2 mirror base is replaced. Document <Adjustment procedure> (1) Put an A3 (11" 17") white paper on the original glass neatly to the glass holding plate and the front frame side as shown below.
  • Page 85 <Adjustment procedure> (1) Make an original for adjustment. Draw parallel lines at 10cm from the both edges of an A3 or 11" 17" white paper. (Be careful to draw precisely parallel lines.) Parallel line 10mm 10mm Blank paper (2) Set the adjustment original made in (1) as shown below. Glass holding plate Fit the original edge with the glass holding plate edge...
  • Page 86: I. Center Shift Adjustment

    (Example) When La=12mm and Lb=9mm, shift the paper exit side mirror base B rail upward by 1.5mm. • When Lc > Ld, shift the mirror base B rail downward by half of the difference of Lc – Ld. • When Lc < Ld, shift the mirror base B rail upward by half of the difference of Lc –...
  • Page 87: K. Copy Lead Edge Adjustment

    (3) Remove the original reference plate and the right upper side cabinet, and remove the original table glass. (4) Move the exposure plates a, b, c, and d in arrows directions A and B to adjust exposure. Moving the plates in the direction of arrow A makes the copy darker, and moving in the direction of arrow B makes the copy lighter.
  • Page 88 (4) Measure the distance between the copy paper lead edge and the copy image lead edge in each copy. Obtain RRC-A and RRC-B values from the following formulas. If the RRC-A preset value is not proper, the lead edge position varies in each magnification ratio. The RRC-B is to adjust the RRC ON timing for fitting the drum image lead edge and the transfer paper lead edge.
  • Page 89: Original Detecting Section

    (11) Make a normal copy and check that the image loss and the void amount are within the specified range. (Specified range) • Image loss: 0 • Void amount: 1 Void area 0~3mm Paper end Solid edge Image loss Full-size(100%) copy 0~4mm (12) Press the clear key and cancel simulation 50-01.
  • Page 90: B. Original Detecting Level Adjustment

    B. Original detecting level adjustment (Original detecting judgement level input) This adjustment is to set the reference value for judgement of presence or absence of an original and to monitor the sensor status. ë ë At that time, the ready lamp lights up and "1" is displayed on the copy quantity display.
  • Page 91: Simulation

    [8] SIMULATION 1. Outline This model is equipped with the simulations feature which allows the following operations with the keys on the operation panel: 1) Adjustments 2) Setting of specifications and functions 3) Resetting trouble codes 4) Checking operations Is there a sub code? Press the print key The set adjustment value or Is the test...
  • Page 92: List Of Simulations

    4. List of simulations Main Content code code Mirror scanning Optical system sensor check Lens operation check Lens operation aging ADF aging ADF sensor check ADF individual load operation check (Paper feed motor forward rotation) ADF individual load operation check (Paper feed motor reverse rotation) ADF individual load operation check (Transport motor forward rotation)
  • Page 93 *1 (Simulation 26-6 Destination setting) Set value Model (Destination) Set value Japan SECL SEEG Cassette size switch table Inch series No cassette (extra) (extra) |: Switch ON : Switch OFF Model (Destination) EX inch series EX AB series EX inch series (for FC) EX AB series (for FC) Taiwan/China AB series...
  • Page 94: Details Of Simulations

    5. Details of simulations ë Simulation input procedure: C Main code Sub code Mirror operation check When the print button is pressed, the mirror is scanned at a speed corresponding to the currently set copy magnification ratio. The copy magnification ratio can be arbitrarily set. Optical system sensors (MHPS, LHPS) state display ON/OFF state of the optical system sensor can be monitored by the LED on the operation panel.
  • Page 95 Main code Sub code ADF individual load operation check (paper feed motor + paper feed solenoid) ADF individual load operation check (transport motor forward rotation + repulsion motor forward rotation) A57 only Sorer sensor state display The ADF sensor ON/OFF states can be monitored with the LED on the operation panel. When the third digit of the multi display is “A,”...
  • Page 96 Main code Sub code DL lamp lighting check The discharge lamp is lighted for 30 sec. BL lamp lighting check The blank lamp is turned on/off every 0.5 sec. PSPS operation check The separation pawl is turned on/off 30 times in the following sequence. PSPS 0.5s Paper feed motor operation check...
  • Page 97 Main code Sub code ADU rear edge plate aging (SF-2120 only) The rear edge plate is returned to the initial position and shifted to the following size positions. AB series Inch series AB series foolscap area Inch series foolscap area ADU alignment plate aging (SF-2120 only) The alignment plate is returned to the initial position and shifted to the following size positions.
  • Page 98 Main code Sub code Maintenance cycle setting Used to set the lighting cycle of the maintenance lamp (è). When this simulation is executed, the currently set maintenance cycle is displayed on the copy quantity display. After setting the number, press the print button to memory the value. Set value Maintenance counter display The maintenance counter value is displayed on the copy quantity display.
  • Page 99 Main code Sub code Jam memory/total jam counter clear The cause (position) of a jam which occurred during copying and the jam total counter are cleared, and the jam total counter value is displayed on the copy quantity display. (“000” is displayed because the counter is cleared.) Trouble memory clear The main code and the sub code of a trouble is cleared.
  • Page 100 Main code Sub code Destination setting Used to set the destination (Japan, SEC, etc.). When this simulation is executed, the currently set destination is displayed on the copy quantity display. Enter the set value and press the PRINT button to store it. Set value Drum sensitivity setting Used to set the drum sensitivity.
  • Page 101 Main code Sub code Rear edge void setting Used to set YES/NO of the paper rear edge void. When this simulation is executed, the currently set rear edge void mode is displayed on the copy quantity display. Enter the set value and press the PRINT button to store it. Set value Auto shut off mode cancel In Japan/SEC, the auto shut off function cannot be canceled by the user.
  • Page 102 Main code Sub code Original sensor check Used to display the judgement result of the original sensor on the operation panel LED. The original sensor values are read sequentially. If the sensor is interrupted (judged as presence of an original), the LED corresponding to the sensor position is turned on.
  • Page 103 Main code Sub code (Note) Developer counter clear Used to clear the currently installed developing unit counter and to display the developer counter value on the copy quantity display. (“000” is displayed because the counter is cleared.) (Note) The counter is cleared by entering the sub code “01.” Fusing temperature setting Used to set the fusing control temperature.
  • Page 104 Main code Sub code Grid voltage correction compulsory execution The grid voltage correction is forcibly executed during the simulation. When the operation is completed, the patch forming grid voltage after grid voltage correction is displayed on the copy quantity display. The relationship between the display value and the patch forming grid voltage value is as shown below.
  • Page 105 Main code Sub code Grid voltage correction, optical dirt correction, drum membrane decrease correction data display Used to display each correction data of the grid voltage correction, the optical dirt correction, and the drum membrane decrease correction on the copy quantity display. Since there are two or more display items, the third digit is used to make distinction between the light reception level and the original judgment level, and the lower two digits are used to display the data.
  • Page 106 Main code Sub code Drum voltage correction drum surface data, patch data display Used to display the drum surface data and the patch data after execution of the grid voltage after simulation 44-5, 6 or during normal operation is displayed on the copy quantity display. Since there are two or more display items, the third digit is used to make distinction between the light reception level and the original judgment level, and the lower two digits are used to display the data.
  • Page 107 Main code Sub code Exposure level adjustment Used to set the copy density (copy lamp output voltage) in each exposure mode. When this simulation is executed, warm-up is started and the currently set manual (ME) upper limit value is displayed on the copy quantity display. When warm-up is completed, the ready lamp lights up.
  • Page 108 Main code Sub code Paper transport direction magnification ratio adjustment Used to set the horizontal (paper transport direction) magnification ratio. When this simulation is executed, warm-up is started and the currently set mirror speed correction value is displayed on the copy quantity display. When warm-up is completed, the ready lamp is lighted.
  • Page 109 Main code Sub code Resist amount adjustment Used to set the warp amount of paper in the resist section. When this simulation is executed, warm-up is started and the currently set tray resist amount is displayed on the copy quantity display. After completion of warm-up, the ready lamp is lighted.
  • Page 110: User Simulation

    Main code Sub code ADF timing sensor adjustment When this simulation is executed, the paper exit reverse sensor original judgement level is adjusted. After completion of this adjustment, the original judgement level is displayed on the copy quantity display. Display range: 0 6.
  • Page 111: User Simulation Code Table

    (2) User simulation Simulation procedure 1. Press the tray selection User simulation input is allowed. key for 5 sec or more. 2. Enter the simulation code Selection of simulation code No. No. with the10-key pad. 3. Press the COPY button. Determination of simulation code 4.
  • Page 112: Self Diagnostics

    [9] SELF DIAGNOSTICS 1. Summary/purpose This model has the self diag function for the following purposes: 1) When a trouble occurs in the machine, the machine detects the trouble and displays the trouble content on the copy quantity dis- play to alert the customer and the serviceman. 2) When any abnormality is detected, the power supply line is cut off immediately for safety and to protect the machine from damage.
  • Page 113 Trouble code Sub code Mirror feed trouble Mirror return trouble Main motor trouble Lens trouble Zero cross pulse (FW) trouble AE sensor trouble Fusing thermistor open detection Fusing high temperature trouble Fusing low temperature trouble Backup memory trouble Backup IC (EEPROM) access error ADU communication error (SF-1120 only) Alignment plate motor trouble...
  • Page 114 Trouble code Sub code Sorter communication error Transport motor trouble Bin upper limit/lower limit trouble Bin home sensor trouble Bin motor trouble Take-out sensor trouble Grasping motor trouble Image density sensor trouble Drum mark sensor trouble Grid voltage correction trouble (Limit over) Grid voltage correction trouble Drum mark sensor gain adjustment...
  • Page 115: General

    [10] SERVICING AT MEMORY TROUBLE AND MAIN CONTROL PWB RE- PLACEMENT 1. General The EEPROM in the control PWB and the EEPROM are storing various set values, adjustment values, and counter values. These data are very important and used for operating the machine properly and for service control.
  • Page 116: Copy Density Adjustment

    Is the toner Use Sim 25-2 to set the density reference value toner density reference value recorded? Use Sim 43-01 to set the fusing temperature Use Sim 22-07 to set the developer replacement cycle counter to the specified value Use Sim 22-06 to set the *1) For setting, refer to the service developer counter memory data recoding sheet...
  • Page 117: Set Value Recording Sheet

    4. Set value recording sheet Memorize set values in the column of "Set value" for efficient servicing when the memory trouble occurs and the EEPROm is replaced. Make a copy of this sheet and use with the service sheet. Purpose/kind Section Main code Paper feed section...
  • Page 118: Memory Simulation List

    5. Memory simulation list Purpose/kind Section Main code Paper feed section Adjustment Optical unit Developer unit Setting Specifications Fuser unit Maintenance counter Developer unit Contents Default code value Adjustment value of contact pressure of the paper on the main body resist roller Copy paper lead edge void amount adjustment (Resist adjustment A) Copy paper lead edge void amount adjustment...
  • Page 119: Maintenance Cycle And Maintenance Items

    [11] MAINTENANCE 1. Maintenance cycle and maintenance items Maintenance of the SF-1020/1120 should be performed at every 50K. <Content> = Lubricate, F = Clean, v = Adjust, b = Replace/attach, ê = Shift position = Check (Clean, replace, or adjust if necessary.) * The toner consumption and the waste toner bottle replacement cycle are those when the reference chart is used.
  • Page 120: Electrical Section

    [12] ELECTRICAL SECTION 1. System block diagram 12 – 1...
  • Page 121 System operation when the power is turned on: Power ON Initial setting Memory transfer Trouble Warm up End of warm up Racing End of racing RPL ON PSW ON RPL OFF Copy cycle End of copying 12 – 2 Heater lampp ON Mirror initial operation Lens initial operation Process contorol...
  • Page 122 BL-DATA BL-DATA VREF VREF PROCON PCG MCG AEG0, AEG1 MMPWM DATA0 FWS, RTH 12 – 3 /CS2 /RESET D0-D7 A0-A2...
  • Page 123: Cpu (Ic6) Sc3041K12F

    (2) CPU (IC6) SC3041K12F General The CPU controls the loads of the main body and controls the system in synchronization with data transmission and reception through the optional controllers and serial data communication line. Features The SC3041K12F is a high performance single-chip micro computer which is integrated with the necessary peripheral devices as well as the main core of 32-bit H8/300H CPU.
  • Page 124 Internal block diagram EXTAL XTAL STBY RES0 P66/LWR P65/HWR P64/RD P63/AS P62/BACK P61/BREQ P60/WAIT P84/CS0 P83/CS1/IRQ3 P82/CS2/IRQ2 P81/CS3/IRQ1 P80/RFSH/IRQ0 Port B *ROM capacity H8/3042 64KByte H8/3041 48KByte H8/3040 32KByte Port 3 Address bus Address bus (Upper) Address bus (Lower) HS/300H CPU Interruption controller contorller...
  • Page 125 CPU SC3041K12F (IC1) pin signal Pin No. Port Signal name IN/OUT CVFMPWM MMPWM /MIR-A MIR-A /MIR-B MIR-B /RES0 /RES0 DATA OP-CLK OP-LATCH Power (+5V) Fan motor (PWM output) signal Serial clock signal for EEPROM Main motor (PWM output) signal Serial data for EEPROM Mirror base motor drive signal -A Mirror base motor drive signal A Mirror base motor drive signal -B...
  • Page 126 Pin No. Port Signal name IN/OUT LHPS DATA0 DATA1 DATA2 S-CLK S-CLK /STBY /STBY /RES /RESET EXTAL EXTAL XTEL XTEL /HWR /LWR AVCC AVCC VREF VREF PROCON BLDATA AVSS MHPS /CS2 /CS1 LED0 LED1 CLPWM MMRE GBPWM PFMCLK Address signal Address signal Lens home position signal (LOW at 100%) Transport pass sensor signal (HIGH when paper is sensed.)
  • Page 127: I/O (Ic8) Cxd1095Q

    (3) I/O (IC8) CXD1095Q General I/O converts data (command) from the CPU into control signals. The CXD1095Q is a general-purpose interface element, and has 4.5 sets of 8-bit I/O ports to allow setting of input and output operations of parallel data by the program or the hardware. Features 8-bit parallel I/O port x 4.5 ports Pin name...
  • Page 128 Internal block diagram DATA ODEN I/O: CXD1095Q (IC8) pin signal Signal Pin No. Port name SRES DVBIAS THV/MHV LATCH LATCH LATCH LATCH LATCH DATA SELECT CONTROL IN/OUT Option receive allow signal Option reset signal Total counter control signal Transport clutch control signal Resist roller clutch control signal Power relay control signal Developing bias control signal...
  • Page 129 Signal Pin No. Port IN/OUT name CPFC1 CPEC2 CPFC3 CPFC4 CS2M CS3M CS4M SELA SELB SELC AEG0 AEG1 /CLR /RESET /ODEN /RESET /CS1 LM-A /LM-A LM-B /LM-B MPFC PSPS P-DOWN DC-OFF Specifications Tray 1 paper feed clutch control signal Tray 2 paper feed clutch control signal Tray 3 paper feed clutch control signal Tray 4 paper feed clutch control signal Tray 2 motor control signal...
  • Page 130: Detector Circuit Of Sensor Signal

    (4) Detector circuit of sensor signal The LS151 selects one signal of D0 D7 according to the combina- tion of SEL A C signals (H, L) and outputs it to Y. Selection of D0 D7 for SEL A C is made as shown in the table below.
  • Page 131: Heater Lamp Control Circuit

    (6) Heater lamp control circuit DSM101 8 ~ 20 2SA573 R5 3 +24V 5.6KJ 47KJ ULN2004 270J 1/4W DTA123Y5 General The heater lamp control circuit detects the heat roller surface temperature with the thermistor, converts it into a voltage, and out- puts it to the CPu analog input pin.
  • Page 132: Stepping Motor Drive Circuit

    [When the heat roller surface temperature is lower than the set temperature] a. Since the thermistor pin voltage is higher then the set level, the output signal HL from the CPU is driven to LOW. b. This HL signal is passed through TR Q3 to the solid state relay (SSR).
  • Page 133: Ae (Auto Exposure) Sensor Circuit

    (9) AE (Auto Exposure) sensor circuit The AE sensor circuit is composed of the AE sensor PWB; which is composed of the photo diode, the I-V convertor circuit, and the amplifier circuit; and the amplifier circuit on the control PWB. 1000PF AEG1 AEG0...
  • Page 134: Operation Panel

    Operation • When "td" (= 30msec) passes after the voltage reaches 4.25V by turning on the power, the output is drive to HIGH. "td" is set by the external capacitor (C106). Block diagram Power 5µA reference 1.25V Delay capacity 4.25V 0.65V Output not constant ta = 30m sec...
  • Page 135: Energystar Circuit Description

    (13) EnergyStar circuit description The EnergyStar circuit composition saves power consumption when the user leaves the machine with the power ON. Normally in a copy mode or in the standby mode, the main PWB connector HL signal is HIGH (5V) and the AC PWB relay (TY201) is turned on to supply power to all the power transformers and the optional power source.
  • Page 136: Adu Circuit Description

    (14) ADU circuit description (1) ADU circuit block diagram 12 – 17...
  • Page 137 (2) ADU CPU (IC1) 1. Outline The CPU controls the loads of the ADU unit and performs data trans- mission through the copier main PWB and the serial data line to make synchronization with data transmission to control the ADU unit. 2.
  • Page 138 4. Pin arrangement (FP-64A: Top view) P50/TXD P51/RXD P52/SCK STBY XTAL EXTAL AVSS P70/AN0 P71/AN1 P72/AN2 5. ADU PWB Port List Used Sig. Name I/O Active Port P5-0 Copier UART signal P5-1 Copier UART signal P5-2 Copier UART signal /RES External reset pin /NMI Non-maskable pin...
  • Page 139 Used Sig. Name I/O Active Port 42 A6 Address signal 43 A5 Address signal 44 A4 Address signal 45 A3 Address signal 46 A2 Address signal 47 A1 Address signal 48 A0 Address signal 49 D0 Data signal 50 D1 Data signal 51 D2 Data signal...
  • Page 140 SPM2 A SPM2-A SPM2 B SPM2-B DDM_DIR DDM_PWM IC8 (SLA4391) internal diagram PAM1 A PAM1 /A PAM1 B PAM1 /B 10KJ uLN2003A 1/4W 1SS133 2SC1740S 2.7KJ 10KJ 2SC1740S 1SS133 2.7KJ 10KJ 6.2KJ 1/2Wx2 SLA4391 SIG1 8.2KJ 1/2W OUT1 SIG2 OUT2 OUT3 OUT4 SIG3...

This manual is also suitable for:

Sf-1120

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