Minolta Di850 Service Manual
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Minolta Di850 Service Manual

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Service Manual

[General]
Di850

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Summary of Contents for Minolta Di850

  • Page 1: Service Manual

    Service Manual [General] Di850...
  • Page 2 Dual references may be used on the following: Official Options name : Popular Options name EDH-5 : RADF C-403/C-404 : LT and LCT FN-115 : FNS FN-7 : FNS Cover Inserte Cr : PI PK-3 : PU TMG-2 ZK-2 : PZ In-System Writer : ISW...

  • Page 4: Table Of Contents

    CONTENTS CONTENTS 1.OUTLINE SAFETY AND IMPORTANT WARNING ITEMS ..S-1 OUTLINE OF SYSTEM ..........1-1 IMPORTANT NOTICE ....S-1 PRODUCT SPECIFICATIONS ........1-2 CENTER CROSS-SECTIONAL VIEW ......1-4 DANGER, WARNING, AND CAUTION  DRIVE SYSTEM DIAGRAM ........1-5 SYMBOLS AND EXPRESSIONS Main Drive Section ........1-5...
  • Page 5 CONTENTS PCL/TSL Control ........2-F-6 FIXING UNIT ............2-O-1 DEVELOPING UNIT ..........2-G-1 Composition ...........2-O-1 Composition........... 2-G-1 Mechanisms ...........2-O-2 Mechanisms .......... 2-G-1 M16 (Web Drive) Control .......2-O-5 M3 (Developing Unit Drive) Control..2-G-2 Fixing Temperature Control ....2-O-6 Developing Bias Control ......2-G-2 SD3 (Fixing Guide) Control ....2-O-8 Toner Density Control......

  • Page 6: Safety And Important Warning Items

    IMPORTANT NOTICE Because of possible hazards to an inexperienced person servicing this copier as well as the risk of damage to the copier, Minolta Corporation strongly recommends that all servicing be performed only by Minolta-trained ser- vice technicians. Changes may have been made to this copier to improve its performance after this Service Manual was printed.

  • Page 7: Safety Warnings

    SAFETY WARNINGS MODIFICATIONS NOT AUTHORIZED BY MINOLTA Minolta copiers are renowned for their high reliability. This reliability is achieved through high-quality design and a solid service network. Copier design is a highly complicated and delicate process where numerous mechanical, physical, and electrical aspects have to be taken into consideration, with the aim of arriving at proper tolerances and safety factors.
  • Page 8 CHECKPOINTS WHEN PERFORMING ON-SITE SERVICE Minolta copiers are extensively tested before shipping, to ensure that all applicable safety standards are met, in order to protect the customer and customer engineer (hereafter called the CE) from the risk of injury. However, in daily use, any electrical equipment may be subject to parts wear and eventual failure.
  • Page 9 SAFETY AND IMPORTANT WARNING ITEMS WARNING: Power Plug and Cord • Do not bundle or tie the power cord. Overheating may occur there, leading to a risk of fire. • Check whether dust is collected around the power plug and wall outlet. Using the power plug and wall outlet without removing dust may result in fire.
  • Page 10 SAFETY AND IMPORTANT WARNING ITEMS WARNING: Ground Lead • Pay attention to the point to which the ground lead is connected. Connecting the ground lead to an improper point such as the points listed below results in a risk of explosion and electric shock: a.
  • Page 11 SAFETY AND IMPORTANT WARNING ITEMS CAUTION: Ventilation • The copier generates ozone gas during operation, but it is not sufficient to be harmful to the human body. If a bad smell of ozone is present in the following cases, ventilate the room. a.
  • Page 12 SAFETY AND IMPORTANT WARNING ITEMS DANGER: Work Performed with the Copier Powered • Take every care when servicing with the external cover detached. High-voltage exists around the drum unit. A risk of electric shock exists. WARNING: Safety Checkpoints • Check the exterior and frame for edges, burrs, and other damages. Personal injuries may result.
  • Page 13 SAFETY AND IMPORTANT WARNING ITEMS WARNING: Safety Checkpoints • After replacing a part to which AC voltage is applied (e.g., optical lamp and fixing lamp), be sure to check the installation state. A risk of fire exists. • Check the interlock switch and actuator for loosening and check whether the interlock functions properly.

  • Page 14: Important Information

    SAFETY INFORMATION DANGER: HANDLING OF MATERIALS FOR SERVICING • Toner and developer are not harmful substances, but care must be taken not to breathe excessive amounts or let the substances come into contact with eyes, etc. It may be stimulative. If the substances get in the eye, rinse with plenty of water immediately.

  • Page 15: Safety Circuits

    SAFETY INFORMATION SAFETY CIRCUITS This machine is provided with the following safety cir- Protection by L2 and L4 (fixing heater cuits to prevent machine faults from resulting in seri- lamps) overheating prevention circuit ous accidents. Overall protection circuit L2 and L4 (fixing heater lamps) overheating ACDB prevention circuit driver...
  • Page 16 SAFETY INFORMATION Protection by the hardware circuit The output voltages from TH1 and TH2 (fixing temperature sensor 2), TH3 (fixing tempera- ture sensor 3), and TH4 (fixing temperature sensor 4) are compared with the abnormality judgement reference value in the comparator circuit.

  • Page 17: Indication Of Warning On The Machine

    SAFETY INFORMATION INDICATION OF WARNING ON THE MACHINE Caution labels shown below are attached in some areas on/in the machine areas. When accessing these areas for maintenance, repair, or adjustment, special care should be taken to avoid burns and shock hazards. CAUTION ATTENTION VORSICHT...

  • Page 18: Safety Information

    SAFETY INFORMATION Unplug the machine before removing platen glass. WARNING Debrancher le copieur avant de retirer la vitre d'exposition. DANGER Vor Entfernen des Vorlagenglases Netzstecker ziehen. WARNUNG Desenchufe la maquina antes de quitar el vidrio. ADVERTENCIA AVVERTIMENTO Estrarre la spina dalla presa prima di rimuovere il vetro di esposizione. Elektrische Teile In dieser Einheit DANGER...
  • Page 19 SAFETY INFORMATION Tray 1 Tray 2 CAUTION CAUTION DO NOT put your hand between the main body and tray; otherwise you may be injured. Tray 3 FN-7 Only CAUTION ATTENTION PRECAUCION CUIDADO CAUTION CAUTION ATTENTION VORSICHT Use care after opening the PRECAUCION ATTENZIONE paper exit outlet.
  • Page 20 SAFETY INFORMATION CAUTION WARNING WARNING Unplug the machine before removing panels. D brancher lÕappareil avant de retirer les panneaux arri res. Desenchufe la m‡quina antes de quitar los paneles. Desconecte a unidade da tomada antes de remover os pain is. Unplug the machine before removing panels.
  • Page 21 SAFETY INFORMATION WARNING Unplug the machine before removing panels. Débrancher l’appareil avant de retirer les panneaux arrières. Desenchufe la máquina antes de quitar los paneles. Desconecte a unidade da tomada antes de remover os painéis. Unplug the machine before removing panels.

  • Page 22: Outline

    OUTLINE...

  • Page 24: Outline Of System

    OUTLINE OUTLINE OF SYSTEM Expansion memory unit [M64-1 / M128-1] Puncher [PK-3] Paper exit tray LCT [C-403] Finisher [FN-115] Cover Inserter [Cover Inserter C] Puncher with Trimmer Finisher Z-folding [TMG-2] [FN-7] [ZK-2] LCT [C-404] Printer Controller...

  • Page 25: Product Specifications

    OUTLINE PRODUCT SPECIFICATIONS [1] Type Zoom magnifications: x0.25 to x4.00 (600 dpi, in 1% steps) Installation Type: Vertical magnifications: Console type (floor-mounted type) x0.25 to x4.00 (600 dpi, in 1% steps) Copying method: Horizontal magnifications: Indirect electrostatic method x0.25 to x4.00 (600 dpi, in 1% steps) Document tray type: Warm-up time: Fixed...
  • Page 26 Every 500,000 copies Puncher with Z-folding :ZK-2 Machine life: Paper exit tray 30,000,000 copies or 5 years Printer Controller: [7] Consumables Developer: Exclusively for Minolta Di850 Toner : Exclusively for Minolta Di850 Drum: Exclusively for Minolta Di850 (ø100) [8] Environmental Conditions Temperature: 10°C to 30°C (50°F to 86°F)

  • Page 27: Center Cross-Sectional View

    OUTLINE CENTER CROSS-SECTIONAL VIEW Charging corona Image processing Cleaning section PCL RADF section section Image read section Exposure lamp Image write section Fixing Developing section section Second paper feed section Paper exit By-pass tray section Transfer corona Paper reverse/ section exit section Vertical conveyance section...

  • Page 28: Drive System Diagram

    OUTLINE DRIVE SYSTEM DIAGRAM [1] Main Drive Section Fixing unit FRONT upper roller Fixing unit Heating roller To paper conveyance and transfer/separation corona cleaning section Main motor (M1) Fixing unit lower roller...

  • Page 29: Drum Drive Section

    OUTLINE [2] Drum Drive Section FRONT Toner guide brush Drum Drum motor (M2) Toner guide shaft Toner conveyance screws Separation claw unit Separation claw solenoid (SD4) Separation claw swing cam...

  • Page 30: Developing Drive Section

    OUTLINE [3] Developing Drive Section Agitator wheel FRONT Agitator screw Developing sleeve Developing motor (M3) [4] Paper Feed Drive Section FRONT To tray 1 paper feed/ tray up drive section To tray 2 paper feed/ tray up drive section To tray 3 paper feed/tray up drive section Paper feed motor (M4)

  • Page 31: Tray 1 And 2 Paper Feed Drive Section

    OUTLINE [5] Tray 1 and 2 Paper Feed Drive Section Tray up motor 1/2 (M19/M20) FRONT Feed roller Pre-feed registration roller Pre-registration MC1/2 (MC4/MC6) Paper feed roller Double feed prevention roller Feed MC1/2 (MC3/MC5) From paper feed drive section...

  • Page 32: Tray 3 Paper Feed Drive Section

    OUTLINE [6] Tray 3 Paper Feed Drive Section Feed roller Pre-feed registration roller FRONT Pre-registration MC3 (MC8) Tray up motor 3 (M21) Paper feed roller Double feed prevention roller From paper feed drive section Feed MC3 (MC7)

  • Page 33: Vertical Conveyance Drive Section

    OUTLINE [7] Vertical Conveyance Drive Section FRONT Vertical conveyance roller (Upper) From bypass paper feed drive section Vertical conveyance From paper roller (Middle) feed drive section Vertical conveyance From paper roller (Lower) Vertical feed drive conveyance section MC1 (MC9) Vertical conveyance MC2 (MC10) 1-10...

  • Page 34: By-Pass Paper Feed Drive Section

    OUTLINE [8] By-pass Paper Feed Drive Section Tray up/down motor (by-pass tray: M22) Paper feed roller FRONT Feed roller To ADU conveyance drive section To vertical conveyance Loop roller motor (M6) 1-11...

  • Page 35: Conveyance/Transfer And Separation Wire Cleaning Drive Section

    OUTLINE [9] Conveyance/Transfer and Separation Wire Cleaning Drive Section FRONT Transfer/separation cleaning motor (M18) Thick paper conveyance rollers Conveyance belts From main drive section 1-12...

  • Page 36: Adu Conveyance Drive Section

    OUTLINE [10] ADU Conveyance Drive Section Registration MC (MC1) Registration motor Loop roller (M12) Registration roller ADU pre-registration MC (MC2) Transfer motor (M9) ADU exit roller ADU conveyance motor (M8) FRONT ADU reverse roller ADU reverse motor (M7) Paper reverse/exit motor (M5) From by-pass paper feed...

  • Page 37: Paper Exit Drive Section

    OUTLINE [11] Paper Exit Drive Section FRONT Paper exit motor (M10) Paper exit roller [12] Toner Supply Drive Section Toner supply motor 2 (M15) Toner supply motor 1 (M11) FRONT Toner cartridge 1-14...

  • Page 38: Optics Drive Section

    OUTLINE [13] Optics Drive Section Scanner drive motor (M13) First mirror Slit-glass Second mirror Third mirror Optics wire (Rear) FRONT Optics wire (Front) 1-15...

  • Page 39: Web Drive Section

    OUTLINE [14] Web Drive Section Web drive motor (M16) FRONT Cleaning web 1-16...

  • Page 40: Unit Explanation

    UNIT EXPLANATION...

  • Page 42: External Section

    EXTERNAL SECTION EXTERNAL SECTION [1] Composition Right side cover RADF(EDH-5) (upper) Main switch Operation panel Cooling cover Front right door Bypass tray Tray 1 Tray 2 Optional cover Tray 3 Rear cover Left side cover Right side cover Left front door (middle) Right side cover Vertical...

  • Page 44: Drive Section

    DRIVE SECTION DRIVE SECTION [1] Composition Drum motor (M2) Main motor (M1) Paper exit motor Developing motor (M3) (M10) Loop roller motor (M6) Paper feed motor (M4) [2] Mechanisms Mechanism Driven Parts Method *1 Drum drive Drum, clearer fur brush Gear drive (dedicated motor) *1 Developing drive Developing sleeve...

  • Page 45: M1 (Main) Control

    DRIVE SECTION [3] M1 (Main) Control [4] M2 (Drum) Control 24VDC 24VDC PGND PGND DCPS2 DCPS2 M2CONT M1 CONT M2 F/R M1 EM SGND M2 EN PRCB PRCB M1 (main) is controlled by the PRCB (printer control M2 (drum) is controlled by the PRCB (printer control board) and the motor drive power is supplied from board) and the motor drive power is supplied from DCPS2 (DC power supply unit 2).

  • Page 46: Read Section

    READ SECTION READ SECTION [1] Composition Scanner drive wire Exposure unit Optics rail (R) V-mirror unit (2nd and 3rd mirrors) Slit glass CCD unit Scanner cooling fan (FM7) A/D converter board [2] Mechanisms Mechanism Method Light source Xenon lamp Exposure Light source shift slit exposure, static exposure Scanning Platen original scanning: 1st, 2nd, and 3rd mirrors are shifted.

  • Page 47: M13 (Scanner Drive) Control

    READ SECTION [3] M13 (Scanner Drive) Control Exposure unit home position search If the exposure unit is not at the home position M13 CLK M13 DRIVE U when the main switch is turned ON or when the M13 F/R M13 DRIVE V M13 CSEL M13 DRIVE W START PRINT button is pressed, the home posi-...
  • Page 48 READ SECTION ADF copy operation PRCB output signals (1) M13 CLK (PRCB to SCDB) Scanner Clock signal for M13. break (2) M13 F/R (PRCB to SCDB) M13 rotational direction switchover signal. Second white correction [L]: The exposure unit is moved toward the paper First white correction exit side.

  • Page 49: Exposure Control

    READ SECTION [4] Exposure control 24VDC L1 CONT L1 CONT L1 INVB 24VDC PGND PRCB SCDB DCPS2 L1 (exposure lamp) is driven by the L1 INVB (L1 inverter) and is controlled by the PRCB (printer control board) via the SCDB (scanner drive board). 1.

  • Page 50: Original Read Control

    READ SECTION [5] Original Read Control [6] APS Control 5VDC PS62 PS62 SGND PS63 PS63 PS64 PS64 PS65 PS65 PS66 PS66 PS67 PS67 PS68 PS68 5VDC SGND ICB IFB PRCB ICB IFB DCPS1 Original read control is performed by the ADB (A/D The APS method used in the platen mode is different converter board) and CCD sensor installed in the ADB.
  • Page 51 READ SECTION (2) Platen mode APS detection timing The paper size is detected according to the com- The APS detection timing differs between the bination of ON/OFF states of PS62 (APS 1), platen mode and DF mode. PS63 (APS 2), PS64 (APS 3), PS65 (APS 4), (1) DF mode PS66 (APS 5), PS67 (APS 6), and PS68 (APS When the DF mode is selected or original is set...

  • Page 52: Ae Control

    READ SECTION [7] AE Control (2) Non-image area erasure mode Entire original area detected by forward scan- ning. (3) DF mode The image at the leading edge of the original is read when the START button is pressed. The read data is used to measure the image den- sity on the original.

  • Page 54: Write Unit

    WRITE UNIT WRITE UNIT [1] Composition Cylindrical lens 1 Polygon mirror Index sensor board Cylindrical lens 2 3rd mirror Laser driver board LD2 Collimator lens unit 2 2nd mirror fθ lens 1 fθ lens 2 Beam combining prism Collimator lens unit 1 Laser driver board LD1 [2] Mechanisms Mechanism...

  • Page 55: M17 (Polygon) Control

    WRITE UNIT *2 Positioning [3] M17 (Polygon) Control Each laser beam is positioned by the compres- sion prism and fine adjustment prism. M17 EM SGND M17 CLK 24VDC *3 Laser beam combining M17 CONT M17 MAG A’ M17 MAG A Two laser beams output at right angle to each M17 MAG B’...
  • Page 56 WRITE UNIT PRCB output signals (1) M17 CONT (PRCB to PMDB) This signal turns ON/OFF M17. [L]: M17 ON [H]: M17 OFF (2) M17 CLK (PRCB to PMDB) This is a reference clock signal for PLL-control- ling M17 in PMDB. PMDB input signals (1) M17 MAG A/A’...

  • Page 57: Image Write Control

    WRITE UNIT [4] Image Write Control M24 PWR A M24 PWR B M24 DRIVE A M24 DRIVE A’ M24 DRIVE B M24 DRIVE B’ 5VDC SGND M INDEX 1 SGND M INDEX 2 SGND S INDEX1 SGND S INDEX 2 SGND HL VL SGND...
  • Page 58 WRITE UNIT 1. Operation <APC timing> Image processing • The LDB1 and LDB2 automatically monitor the The following processing is performed by the ICB laser drive current one line at a time, and con- (image control board): trols it so that the light intensity remains the (1) AOC (Auto Offset Control) MPC value.
  • Page 59 WRITE UNIT 2. Signals (9) LD1 VIDEO (ICB IFB to LDB1) ICB IFB input signals LD1 laser image signal. (1) M INDEX 1, 2 (INDEXSB to ICB IFB) (10) LD2 VIDEO (ICB IFB to LDB2) This is an index signal used to detect deviation of LD2 laser image signal.

  • Page 60: Drum Unit

    DRUM UNIT DRUM UNIT [1] Composition Charging corona unit Developing unit Separation claws Cleaning/toner recycle unit Separation claw solenoid (SD4) Charging corona unit Developing unit Cleaning/toner recycle unit Transfer and separation corona unit [2] Mechanisms nism slides the separation claws about 5 mm back and forth in parallel with the drum sur- Mechanism Method...

  • Page 61: Separation Claw Control

    DRUM UNIT [3] Separation Claw Control [4] Paper Guide Plate Control GP CONT 24VDC SD4 DRIVE M2CONT PRCB ADUSDB M2EM PRCB MS2 MS1 24VDC 24VDC PGND PGND DCPS2 DCPS2 The separation claw is driven by SD4 (separation claw). The vibration of the separation claw is put in by To prevent toner from adhering to the paper guide M2 (drum).

  • Page 62: Drum Potential Control

    DRUM UNIT [5] Drum Potential Control 2. Signals PRCB Input signals (1) DPS ANG (DPSB to PRCB) DPS DRIVE A DPS DRIVE B Analog signal corresponding to the drum charg- DPS ANG 1 DPS ANG 2 ing potential. DPS ANG SGND DPSB Input signals PRCB...

  • Page 64: Corona Unit Section

    CORONA UNIT SECTION CORONA UNIT SECTION [1] Composition <Charging corona unit> <Transfer and separation corona unit> Transfer entrance guide plate Guide rollers Charging corona wires Transfer corona unit Plunging prevention plate Charging wire cleaning motor Separation corona unit (M23) Charging wire cleaning material [2] Mechanisms Charging wire cleaning material Mechanism...

  • Page 65: Charging Control

    CORONA UNIT SECTION [3] Charging Control 2. Signals Input signal (1) C SIG (HV1 to PRCB) C CONT1 Leak or short detection signal. C CONT2 C SHIFT [L]: Normal SGND C SIG [H]: Abnormal CHARGING Output signals G SHIFT (1) C CONT1, 2 (PRCB to HV1) Charging 1/2 output ON/OF control signal.

  • Page 66: Transfer/Separation Control

    CORONA UNIT SECTION [4] Transfer/Separation Control PRCB output signals (1) T SHIFT (PRCB to HV2) Transfer corona unit output level control signal. 24VDC PGND This signal controls the level of the output to the DCPS2 transfer corona unit according to the duty ratio of SEPARATION 24VDC the pulse (PWM) signal sent from the PRCB.

  • Page 67: M23 (Charger Cleaning) Control

    CORONA UNIT SECTION ADUSDB output signals [5] M23 (Charger Cleaning) Control (1) T CONT (ADUSDB to HV2) Transfer corona unit output ON/OFF control sig- nal. 5VDC PS41 PS41 [L]: Transfer corona unit ON SGND [H]: Transfer corona unit OFF PS42 PS42 (2) S CONT (ADUSDB to HV2) Separation corona unit output ON/OFF control...

  • Page 68: M18 (Transfer/Separation Cleaning) Control

    CORONA UNIT SECTION 2. Signals [6] M18 (Transfer/Separation Cleaning) Input signals Control (1) PS41 (PS41 to PRCB) Charging wire cleaning pad home position detection signal. DRIVE1 This signal detects the reference position of the DRIVE2 charging wire cleaning pad home position. [L]: HP detected [H]: HP not detected PRCB...

  • Page 69: Pcl/Tsl Control

    CORONA UNIT SECTION Cleaning operation [7] PCL/TSL Control The home position of the transfer and separation wire cleaning pads is on the front side of 24VDC machine. The transfer and separation wire PGND cleaning pads operate as follows: DCPS2 Transfer/Separation wire Transfer/Separation wire cleaning pad HP cleaning pad limit...

  • Page 70: Developing Unit

    DEVELOPING UNIT DEVELOPING UNIT [1] Composition Developing unit cover Developing regulation plate Developing Agitator sleeve wheel Developing sleeve Splash prevention Agitator screws sheet (upper) [2] Mechanisms Drum Mechanism Method Developing 2-component developer Developing regulation plate Developing bias DC bias Developer Main agitator agitation Auxiliary agitator...

  • Page 71: M3 (Developing Unit Drive) Control

    DEVELOPING UNIT [3] M3 (Developing Unit Drive) Control [4] Developing Bias Control 24VDC 24VDC BIAS PGND 5VDC SGND B CONT DCPS2 B SHIFT B FB M3 CONT PRCB M3 CLK M3 EM 5VDC SGND PRCB DCPS1 M3 (developing) is controlled by the PRCB (printer 24VDC MS2 MS1 control board) and the motor drive power is supplied by...

  • Page 72: Toner Density Control

    DEVELOPING UNIT [5] Toner Density Control 2. Signals Output signals (1) M11 DRIVE A, A (PRCB to M11) 24VDC 24VDC M11 A-phase drive signal. M11 DRIVE A (2) M11 DRIVE B, B (PRCB to M11) M11 DRIVE A M11 B-phase drive signal. M11 DRIVE B M11 DRIVE B PRCB...

  • Page 73: Dmax Control

    DEVELOPING UNIT [6] Dmax Control 24VDC 24VDC PGND M2 CONT DCPS2 M2 F/R SGND M2 EM 12VDC 5VDC SGND M3 CONT M3 CLK DCPS1 M3 EM DPS DRIVE A DPS DRIVE B DPS ANG 1 DPS ANG DPS ANG 2 AGND TH5 ANG1 DPSB...
  • Page 74 DEVELOPING UNIT 2. Signals PRCB input signals (1) Dmax SIG (TCSB to PRCB) Output voltage of the Dmax value detection sen- sor (PD1) on the TCSB. Reference voltage: 2.5V (2) Dmax MONI (TCSB to PRCB) This signal monitors the light reflected by the drum surface (without toner).

  • Page 75: Gradation Correction Control

    DEVELOPING UNIT [7] Gradation Correction Control 24VDC 24VDC PGND M2 CONT DCPS2 M2 F/R SGND M2 EM 12VDC 5VDC SGND M3 CONT M3 CLK DCPS1 M3 EM DPS DRIVE A DPS DRIVE B DPS ANG 1 DPS ANG DPS ANG 2 AGND DPSB 5VDC...

  • Page 76: Dot Diameter Correction Control

    DEVELOPING UNIT PRCB Output signals [8] Dot Diameter Correction Control (1) γ LED CONT, γ CONT (PRCB to TCSB) ON/OFF control signal for gradation detection LED. [L]: LED ON [H]: LED OFF (2) γ Dmax LED Vref, Vref (PRCB to TCSB) Power supply line to the γ...

  • Page 77: Fm2 (Developing Suction) Control

    DEVELOPING UNIT [9] FM2 (Developing Suction) Control FM2 CONT FM2 DRIVE FM2 EM PGND FM2 FEM PRCB 24VDC PGND DCPS2 ACDB FM2 (Developing suction) is controlled by the PRCB PRCB output signals (printer control board) via the ACDB (AC drive board). (1) FM2 CONT (PRCB to ACDB) When the front right or left door of this machine opens FM2 control signal.

  • Page 78: Toner Supply Unit

    TONER SUPPLY UNIT TONER SUPPLY UNIT [1] Composition Toner cartridge Toner supply motor 1 (M11) Push pressure lever Shutter Toner supply motor 2 (M15) [2] Mechanisms The agitator plates prevent the toner from clumping and accumulating on TLD (remaining toner detection Mechanism Method sensor).

  • Page 79: Toner Level Detection Control

    TONER SUPPLY UNIT *2 Toner cartridge [3] Toner Level Detection Control When the toner cartridge rotates, toner is fed to the outlet of the cartridge through the spiral 24VDC PGND groove on the surface of the toner cartridge. DCPS2 When the outlet of the cartridge faces downward, toner flows out of the outlet into the agitation/sup- ply section of the toner supply unit.

  • Page 80: M11 (Toner Supply 1) Control

    TONER SUPPLY UNIT 2. Signals [4] M11 (Toner Supply 1) Control Input signal (1) TLD (TLD to PRCB) 24VDC When the level of toner in the cartridge becomes 24VDC low, this signal goes low [L], displaying a mes- M11 DRIVE A sage on the LCD connected to the OB1.

  • Page 82: Cleaning/Toner Recycle Unit

    CLEANING/TONER RECYCLE UNIT CLEANING/TONER RECYCLE UNIT [1] Composition Blade drive motor (M14) Blade 2 Blade 1 Toner guide shaft Toner guide brush Toner conveyance screw Vibration sheet [2] Mechanisms Mechanism Method *1 Drum cleaning Cleaning blades (switched automatically) Toner collection Toner guide brush *2 Toner recycle Toner conveyance by screw...

  • Page 83: M14 (Blade) Control

    CLEANING/TONER RECYCLE UNIT [3] M14 (Blade) Control Blade Position Sensor Pressing CW/ Slight Switching 5VDC pressing PS30 PS30 SGND ON or PS30 OFF* PS31 PS31 PS31 *Note: CW/CCW indicate the M14 rotating direc- M14 DRIVE 1 tion for pressing, slight pressing, and M14 DRIVE 2 switching.

  • Page 84: Tray 1/2 Paper Feed Unit

    TRAY 1/2 PAPER FEED UNIT TRAY 1/2 PAPER FEED UNIT [1] Composition Side guides Feed roller Paper feed roller Double feed prevention roller Trailing edge stopper Drive pulley Wire A Wire B Paper size detection VR1, 2 Up drive motor 1 (M19), 2 (M20) Paper size detection PS1-1, 2-1 (PS32, PS33) Paper size detection PS1-2, 2-2 (PS35, PS36) Caution: Trays 1 and 2 have the same shape...
  • Page 85 TRAY 1/2 PAPER FEED UNIT b) Lowering of up/down plate Paper size detection When the paper feed tray is pulled out, the Length: The rear guide of the tray moves, caus- guide lever shown below is disengaged from ing the paper size detection actuator to the rail, thus releasing the coupling gear that move as well.

  • Page 86: First Paper Feed Control

    TRAY 1/2 PAPER FEED UNIT [3] First Paper Feed Control 5VDC 24VDC M4 CONT SGND PGND M4 EM DCPS1 DCPS2 M4 CLK 24VDC M4 F/R MC3 CONT 5VDC PS47 PS47 MC4 CONT SGND PS48 PS48 SD8 CONT 5VDC PS49 24VDC PS49 MC5 CONT SGND...
  • Page 87 TRAY 1/2 PAPER FEED UNIT 2. Signals PRCB output signals PRCB input signals (1) MC3 CONT (PRCB to MC3) (1) PS47 (PS47 to PRCB) MC3 drive control signal (tray 1). Paper passage detection signal (tray 1). [L]: MC3 ON [L]: Paper passed. [H]: MC3 OFF [H]: Paper not passed.

  • Page 88: Paper Up Drive Control

    TRAY 1/2 PAPER FEED UNIT [4] Paper Up Drive Control 5VDC 5VDC SGND PS14 PS14 DCPS1 SGND PS20 PS20 24VDC PGND DCPS2 PS34 PS34 5VDC 24VDC PS15 PS15 M19 CONT SGND PS21 24VDC PS21 SD5 CONT PS37 PS37 24VDC M20 CONT 24VDC SD6 CONT PRCB...
  • Page 89 TRAY 1/2 PAPER FEED UNIT Remaining Paper Detection Control PRCB output signals The level of paper remaining in each tray is (1) M19 CONT (PRCB to M19) detected according to the time that M19 or M20 M19 ON/OFF control signal (tray 1). requires to lift up the paper up/down plate when [L]: M19 ON the tray is set.

  • Page 90: Paper Size Detection Control

    TRAY 1/2 PAPER FEED UNIT [5] Paper Size Detection Control 2. Signals Input signals (1) PS32 (PS32 to PRCB) Paper size detection switch ON/OFF signal (tray 5VDC PS32 PS32 SGND (2) PS33 (PS33 to PRCB) Paper size detection switch ON/OFF signal (tray PS33 PS33 (3) PS35 (PS35 to PRCB)

  • Page 91: No Paper Detection Control

    TRAY 1/2 PAPER FEED UNIT [6] No Paper Detection Control 5VDC PS26 PS26 SGND 5VDC PS27 PS27 SGND 5VDC SGND PRCB DCPS1 No paper in the tray is detected by PS26 (no paper 1) and PS27 (no paper 2) which are controlled by the PRCB (printer control board).

  • Page 92: Tray 3 Paper Feed Unit

    TRAY 3 PAPER FEED UNIT TRAY 3 PAPER FEED UNIT [1] Composition Paper feed roller Feed roller Side guide Double feed prevention roller Trailing edge stopper Drive pulley Front cover Wire A Paper size detection PS1-3 (PS38), 2-3 (PS39) Wire B Paper size detection VR3 Up drive motor 3 (M21)
  • Page 93 TRAY 3 PAPER FEED UNIT b) Lowering of up/down plate Paper size detection When the paper feed tray is pulled out, the Length: The rear guide of the tray moves, caus- guide lever shown below is disengaged from ing the paper size detection actuator to move as the rail, thus releasing the coupling gear that well.

  • Page 94: First Paper Feed Control

    TRAY 3 PAPER FEED UNIT [3] First Paper Feed Control 24VDC 24VDC PGND PGND DCPS2 M4 CONT M4 EM M4 CLK 5VDC M4 F/R SGND DCPS1 5VDC 24VDC PS51 MC7 CONT PS51 SGND PS52 PS52 MC8 CONT MC10 MC10 CONT PRCB The 1st paper feed from tray 3 takes place as the result 2.

  • Page 95: Paper Up Drive Control

    TRAY 3 PAPER FEED UNIT [4] Paper Up Drive Control Remaining Paper Detection The level of paper remaining in each tray is detected according to the time that M21 requires 5VDC 5VDC SGND PS16 PS16 to lift up the paper up/down plate when the tray is SGND DCPS1 set.

  • Page 96: Paper Size Detection Control

    TRAY 3 PAPER FEED UNIT [5] Paper Size Detection Control [6] No Paper Detection Control 5VDC 5VDC PS38 PS38 PS28 PS28 SGND SGND PS39 PS39 5VDC SGND PRCB DCPS1 No paper in the tray is detected by PS28 (no paper 3) 5VDC SGND which is controlled by the PRCB (printer control board).

  • Page 98: By-Pass Tray

    BY-PASS TRAY BY-PASS TRAY [1] Composition By-pass feed roller Pick up solenoid (SD11) By-pass paper feed roller Paper feed swivel plate By-pass feed tray By-pass double feed prevention roller By-pass feed roller *2 Paper lift-up [2] Mechanisms When paper is set in the bypass tray, the up/ down motor (by-pass) (M22) drives the paper up/ Mechanism Method...

  • Page 99: First Paper Feed Control

    BY-PASS TRAY [3] First Paper Feed Control Paper size PS1 (PS55) 24VDC SD11 SD11 CONT 24VDC 24VDC M6 DRIVE A M6 DRIVE A M6 DRIVE B M6 DRIVE B 24VDC 24VDC PGND PGND PRCB DCPS2 Paper size PS2 (PS56) Paper size By-pass detection tray...

  • Page 100: Paper Up/Down Control

    BY-PASS TRAY [4] Paper Up/down Control 2. Signals Input signals (1) PS23 (PS23 to PRCB) 5VDC Paper upper limit position detection signal (by- 5VDC SGND PS23 PS23 pass tray). SGND DCPS1 [L]: Detected 24VDC [H]: Not detected PGND PS43 PS43 (2) PS43 (PS43 to PRCB) DCPS2 Paper lower limit position detection signal (by-...

  • Page 101: Paper Size Detection Control

    BY-PASS TRAY [5] Paper Size Detection Control [6] No Paper Detection Control 5VDC PS55 PS55 SGND 5VDC PS29 PS29 SGND PS56 PS56 5VDC SGND PRCB DCPS1 5VDC SGND PRCB DCPS1 No paper in the tray is detected by PS29 (no paper (by- pass tray)) which is controlled by the PRCB (printer The size of paper in the by-pass tray is detected by control board).

  • Page 102: Vertical Paper Conveyance Section

    VERTICAL PAPER CONVEYANCE SECTION VERTICAL PAPER CONVEYANCE SECTION [1] Composition Loop PS (PS54) Vertical conveyance roller (upper) Vertical conveyance Vertical conveyance MC1 roller (middle) (MC9) Vertical conveyance Vertical conveyance MC2 roller (lower) (MC10) [2] Mechanisms Mechanism Method Paper conveyance Rollers Conveyance drive Vertical conveyance roller (upper): Loop roller motor (M6) Vertical conveyance roller (middle): Paper feed motor (M4)

  • Page 103: Vertical Paper Conveyance Control

    VERTICAL PAPER CONVEYANCE SECTION [3] Vertical Paper Conveyance Control earlier than the second paper feed operation starts. Accordingly, the paper condition in the second paper feed section is detected by PS53 M4 CONT to turn OFF MC9 and MC10, stopping the con- M4 EM veyance temporarily.

  • Page 104: Adu

    [1] Composition Paper gate Thick paper conveyance roller Paper reverse/exit entrance Pre-transfer roller section roller Conveyance belts Registration roller Loop roller Paper exit roller Paper reverse/ exit roller 1 Pre-registration ADU reverse Paper reverse/ loop roller roller exit roller 3 Paper reverse/ Pre-registration exit roller 2...

  • Page 105: Mechanisms

    [2] Mechanisms Mechanism Method Second paper feed paper loop Loop roller *1 Second paper feed mis-centering correction Write information is corrected according to the informa- tion detected by PS1 (paper mis-centering PS) *2 Second paper feed auxiliary mechanism Pre-transfer section roller Second paper feed paper conveyance drive Registration motor (M12) drive *3 Second paper feed jam removal mechanism...
  • Page 106 *1 Second paper feed paper mis-centering correc- *3 Second paper feed unit jam removal mechanism tion The registration roller is sandwiched between PS1 (paper mis-centering) is mounted at the exit the registration loop jam removal section and the of the registration roller to detect mis-centering pre-transfer jam removal section.
  • Page 107 *5 Paper conveyance unit paper suction mecha- Paper path selection to paper reverse/exit sec- nism tion A paper suction duct is provided in the middle of The paper gate determines whether the paper the paper conveyance and leads to the develop- fed out from the fixing unit is to be ejected ing suction fan (FM2) installed at the back of the straight, or reversed and ejected.
  • Page 108 b) Straight ejection When paper is ejected straight, SD2 is turned ON to close the paper gate. The paper fed by the paper reverse/exit entrance roller is fed through the path over the paper gate because this gate is closed, then fed to the paper exit roller. Thus, the paper is ejected to the paper exit with the print side up.
  • Page 109 c) ADU paper conveyance Paper reverse/exit section jam removal mecha- In the two-sided copy mode, the paper finished nism with printing on the front side is fed, through the a) Jam access guide plate path under the paper gate, into the paper When a jam occurs in the paper gate section, the reverse/exit section just like paper reverse/exit jammed paper can be removed by opening the...
  • Page 110 *9 Nonstack paper feed mechanism *10 ADU pre-registration mechanism In the two-sided copy mode, the paper fed from In the ADU, paper is looped by the pre-registra- the paper reverse/exit section is conveyed to the tion roller and pre-registration loop roller to cor- ADU section by the ADU reverse roller.
  • Page 111 *11 ADU section jam removal mechanism *12 ADU jam indication When a jam occurs in the ADU horizontal con- The ADU has a jam indicator that indicates the veyance section, the jammed paper can be location of the jam (ADU, second paper feed unit, removed by opening the ADU horizontal convey- conveyance unit, or fixing unit).

  • Page 112: Loop/Second Paper Feed Control

    [3] Loop/Second Paper Feed Control 5VDC PS54 PS54 24VDC SGND M12 CONT M12 CLK M12 EM 24VDC PGND 24VDC M6 DRIVE A M6 DRIVE A 24VDC M6 DRIVE B M6 DRIVE B MC1 CONT 24VDC 5VDC -5VDC PRCB PS1 VIDEO PS1 SI PS1 CLK 5VDC...

  • Page 113: Paper Conveyance Control

    2. Signals [4] Paper Conveyance Control PRCB input signals (1) PS54 (PS54 to PRCB) Loop formation reference timing detection sig- nal. 24VDC 24VDC The leading edge or trailing edge of paper is M9 DRIVE A detected. M9 DRIVE A [L]: Paper exists M9 DRIVE B [H]: Paper does not exist M9 DRIVE B...

  • Page 114: Paper Reverse And Exit Control

    [5] Paper Reverse and Exit Control 24VDC 24VDC M10 DRIVE A M10 DRIVE A 24VDC M10 DRIVE B 24VDC M10 DRIVE B M5 DRIVE A 5VDC M5 DRIVE A PS61 PS61 SGND M5 DRIVE B M5 DRIVE B 24VDC SD2 CONT PRCB 5VDC SGND...
  • Page 115 b) Linear velocity is changed to high speed (5) PS57 (PS57 to ADUSB to PRCB) when the trailing edge of the paper conveyed Reverse and eject control reference timing sig- at low speed by M5 passes the nip of the fix- nal.

  • Page 116: Adu Paper Feed/Reversal Control

    [6] ADU Paper Feed/Reversal Control 24VDC 24VDC 24VDC 24VDC M5 DRIVE A M7 DRIVE A M5 DRIVE A M7 DRIVE A M5 DRIVE B M7 DRIVE B M5 DRIVE B M7 DRIVE B 5VDC PS58 PS58 SGND 5VDC PS59 PS59 SGND 5VDC PS60...
  • Page 117 2. Signals ADUSDB input signals (1) PS58 (PS58 to ADUSDB to PRCB) Detection of paper passage in ADU paper rever- sal section. M7 is rotated in the opposite direction or turned OFF with reference to this signal. The leading edge or trailing edge of paper is detected. [L]: Paper exists [H]: Paper does not exist (2) PS59 (PS59 to ADUSDB to PRCB)

  • Page 118: Adu Paper Conveyance/Feed Control

    [7] ADU Paper Conveyance/Feed Control 24VDC 24VDC M12 CONT 24VDC M12 CLK M12 EM M8 DRIVE A PGND M8 DRIVE A M8 DRIVE B M8 DRIVE B 5VDC 24VDC PS59 SD1 CONT PS59 SGND 24VDC MC2 CONT PS60 PS60 5VDC SGND PS10 PS10...
  • Page 119 ADU lock control The ADU handle is locked by SD1. PS10 detects the handle position to determine whether the handle is locked or released. 2. Signals ADUSDB input signals (1) PS9 (PS9 to ADUSDB to PRCB) Detection of paper passage in ADU section. [L]: Paper exists [H]: Paper does not exist (2) PS10 (PS10 to ADUSDB to PRCB)

  • Page 120: Fixing Unit

    FIXING UNIT FIXING UNIT [1] Composition Cleaning web 11. Thick paper conveyance auxiliary plate Fixing upper cover 12. Fixing heat roller Fixing web motor (M16) 13. Heater lamp (L4) Pressure release shaft 14. Scraper Fixing paper exit unit 15. Fixing lower roller Cleaning web wind-up shaft 16.

  • Page 121: Mechanisms

    FIXING UNIT [2] Mechanisms Mechanism Method Fixing Pressure + heat roller *1 Heat source Heater lamp (fixing upper roller (two lamps), Fixing heat roller (one lamp)) *2 Cleaning Upper roller: Cleaning web (with silicon oil) Fixing heat roller: Scraper Upper roller Aluminum + PFA coating (black) Lower roller Silicon rubber (black) + PFA tube...
  • Page 122 FIXING UNIT *1 Fixing heater lamps *3 Fixing heat roller Two halogen lamps are used for the fixing upper The fixing heat roller incorporating one halogen roller and one halogen lamp is used for the fixing lamp rotates keeping contact with the fixing lower heat roller.
  • Page 123 FIXING UNIT *5 Jam detection Thick paper conveyance When a jam occurs in the paper exit section in the When a thick paper is fed, the fixing guide sole- fixing unit, the jammed paper presses down the noid (SD3) installed on the ADU side is turned actuator, causing the fixing jam sensor (PS3) to ON and the thick paper conveyance auxiliary detect a jam via the jam detection plate and actu-...

  • Page 124: M16 (Web Drive) Control

    FIXING UNIT [3] M16 (Web Drive) Control 2. Signals Input signals 5VDC (1) PS2 (PS2 to PRCB) 5VDC SGND Detection of passage of paper at fixing unit exit. SGND DCPS1 [L]: Paper exists [H]: Paper does not exist (2) PS3 (PS3 to PRCB) 24VDC PGND Fixing jam detection signal.

  • Page 125: Fixing Temperature Control

    FIXING UNIT [4] Fixing Temperature Control TH1 ANG 1 TH1 ANG 2 TH2 ANG 1 TH2 ANG 2 TH3 ANG 1 TH3 ANG 2 TH4 ANG 1 TH4 ANG 2 24VDC RL1 CONT L2 CONT L3 CONT L2&L3 CONT AC(H) L4 DRIVE L4 CONT AC(C)
  • Page 126 FIXING UNIT Protection against abnormality (4) L4 CONT (PRCB to ACDB) Thermostats are used to prevent the tempera- L4 drive control signal. ture of the fixing rollers from rising abnormally. [L]: L4 ON TS1 (thermostat 1 (upper)) is used for the fixing [H]: L4 OFF upper roller and TS2 (thermostat 2 (lower)) is ACDB output signals...

  • Page 127: Sd3 (Fixing Guide) Control

    FIXING UNIT [5] SD3 (Fixing Guide) Control 24VDC SD3 CONT 5VDC PS45 PS45 SGND ADUSDB PRCB 5VDC 24VDC SGND PGND DCPS1 DCPS2 SD3 (fixing guide) is driven by ADUSDB (ADU stand drive board) and controlled by serial data sent from PRCB (printer control board).

  • Page 128: Other Kinds Of Control

    OTHER KINDS OF CONTROL OTHER KINDS OF CONTROL [1] Parts Energized when the Main Switch is OFF AC(H) AC(H) 5VDC CBR1 AC(C) DCPS1 PSMB TRANS- TRANS- FORMER FORMER 1. Operation If the power cord is plugged in the wall outlet, the following parts are energized regardless of whether SW1 (main) is ON or OFF: CBR1 (circuit breaker 1)

  • Page 129: Parts That Operate When The Sw1

    OTHER KINDS OF CONTROL [2] Parts that Operate when the SW1 (Main) is Turned ON 5VDC From ACDB RL1 CONT Fixing heater power supply AC(H) AC(H) 5VDC -5VDC AC(C) AC(C) 12VDC SGND Power supplies for boards, 5VDC DCPS1 motors, fans, solenoids, etc. AC(H) 24VDC PGND...

  • Page 130: Cooling Fan Control

    OTHER KINDS OF CONTROL [3] Cooling Fan Control FM10 FM11 FM12 1. Operation FM5, FM8 A 24V DC motor is used for each cooling fan. (1) ON timing Turned ON after power-on. (1) ON timing • Always rotates at low speed during idling. Held ON during copy operation.
  • Page 131 OTHER KINDS OF CONTROL 2. Signals (3) FM4 CONT (PRCB to ACDB) PRCB input signals FM4 ON/OFF control signal. (1) FM3 EM (FM3 to PRCB) [L]: FM4 ON FM3 fault detection signal. [H]: FM4 OFF [H]: Fault is detected (4) FM4 H/L (PRCB to FM4) (2) FM4 EM (FM4 to PRCB) FM4’s rotational speed control signal.
  • Page 132 OTHER KINDS OF CONTROL ADUSDB output signal (1) FM1 DRIVE (ADUSDB to FM1) FM1 ON/OFF control signal. [L]: FM1 ON [H]: FM1 OFF (2) FM10 DRIVE (ADUSDB to FM10) FM10 ON/OFF control signal. [L]: FM10 ON [H]: FM10 OFF (3) FM11 DRIVE (ADUSDB to FM11) FM11 ON/OFF control signal.

  • Page 133: Operation Panel Control

    OTHER KINDS OF CONTROL [4] Operation Panel Control OB1 TXD OB1 RXD OB1 TXD ACK OB1 RXD ACK OB1 TXD REQ OB1 RXD REQ OBINVB WT LED ST LED PSMB SGND 5VDC JAM L1 JAM L2 12VDC JAM L3 5VDC JAM L4 SGND JAMIB...
  • Page 134 OTHER KINDS OF CONTROL 2. Signals PRCB input signals (1) OB1 RXD (OB1 to ICB) Serial data which informs ICB of the operation state of OB1. (2) OB1 TXD REQ (OB1 to ICB) Signal which indicates that data is being sent from OB1 to ICB.

  • Page 135: Counter Control

    OTHER KINDS OF CONTROL [5] Counter Control 2. Signals Input signals (1) PS61 (PS61 to PRCB) Signal indicating passage of paper in the paper exit section. [L]: PS61 is turned ON to indicate that paper has been ejected. (2) C (K) 24V 1F (ACDB to PRCB) ICB IFB Signal indicating the state of 24 V power supply to C (K).

  • Page 136: Option Control

    OTHER KINDS OF CONTROL [6] Option Control (C-403 / C-404) (FN-7 / FN-115) LAN RB OP IFB ICB IFB Controller 5VDC INDICATOR SGND LAMP DCPS1 24VDC PGND PRCB COIN DCPS2 VENDOR 24VDC PGND ACDB Options such as LCT and FNS are controlled by the PRCB (printer control board).
  • Page 137 OTHER KINDS OF CONTROL <Functions and output timings of signals for coin vendors> Connector Pin No. Signal name Description Output timing Signal type DC24V Key counter power supply Always 24 V, 300 mA C(K) SIG Key counter connection recognition – C(K) GND Signal ground –...
  • Page 138 Copyright 2002 MINOLTA CO., LTD. Use of this manual should be strictly supervised to avoid disclosure of confidential information. MINOLTA Co.,Ltd. 7661-4027-11 02080000...

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