Konica Minolta Bizhub 20 Service Manual

Service Manual Konica Minolta Bizhub 20;
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CHAPTER 1 SPECIFICATIONS
THIS CHAPTER LISTS THE SPECIFICATIONS OF EACH MODEL, WHICH ENABLES YOU TO MAKE A COMPARISON
OF DIFFERENT MODELS.
CONTENTS
1. COMPONENTS
2. SPECIFICATIONS LIST
2.1 PRINTING
2.2 FUNCTIONS
2.3 ELECTRONICS AND MECHANICS
2.4 NETWORK CONNECTIVITY
2.5 SERVICE INFORMATION
2.6 PAPER
2.6.1 PAPER HANDLING
2.6.2 MEDIA SPECIFICATIONS
2.6.3 TYPE AND SIZE OF PAPER
2.7 PRINTABLE AREA
2.8 PRINT SPEEDS WITH VARIOUS SETTINGS
2.9 TELEPHONE
2.10 FAX
2.11 LIST/REPORT
2.12 COPY
2.13 DOCUMENT SCANNER
2.14 USB HOST

CHAPTER 2 THEORY OF OPERATION
THIS CHAPTER GIVES AN OVERVIEW OF THE SCANNING AND PRINTING MECHANISMS AS WELL AS THE
SENSORS, ACTUATORS, AND CONTROL ELECTRONICS. IT AIDS IN UNDERSTANDING THE BASIC PRINCIPLES OF
OPERATION AS WELL AS LOCATING DEFECTS FOR TROUBLESHOOTING
CONTENTS
1. OVERVIEW
2. ELECTRONICS
2.1 GENERAL BLOCK DIAGRAM
3. MECHANICS
3.1 CROSS-SECTION DRAWING
3.2 SCANNER MECHANISM
3.2.1 DOCUMENT SCANNER UNIT
3.2.2 ADF UNIT
3.3 PAPER FEEDING
3.3.1 PLATE-UP FUNCTION OF THE PAPER TRAY
3.3.2 PAPER SUPPLY
3.3.3 PAPER REGISTRATION
3.3.4 PAPER EJECT
3.3.5 DUPLEX PRINTING
3.3.6 PAPER FEEDING FROM THE MP TRAY
3.3.7 PAPER FEEDING FROM THE TRAY 2
3.4 TONER CARTRIDGE
3.4.1 METHODS FOR DETECTING TONER LIFE
3.4.2 CARTRIDGE LIFE
3.4.3 NEW TONER DETECTION
3.5 PRINT
3.5.1 BASIC PRINCIPLE
3.5.2 PRINT PROCESS
3.6 SENSORS POSITION

CHAPTER 3 ERROR INDICATION AND TROUBLESHOOTING
THIS CHAPTER DETAILS ERROR MESSAGES AND CODES THAT THE INCORPORATED SELF-DIAGNOSTIC
FUNCTIONS DISPLAY IF ANY ERROR OR MALFUNCTION OCCURS. IF ANY ERROR MESSAGE APPEARS, REFER TO
THIS CHAPTER TO FIND WHICH COMPONENTS SHOULD BE CHECKED OR REPLACED.
THE LATTER HALF OF THIS CHAPTER PROVIDES SAMPLE PROBLEMS THAT COULD OCCUR IN THE MAIN SECTIONS
OF THE MACHINE AND RELATED TROUBLESHOOTING PROCEDURES. THIS WILL HELP SERVICE PERSONNEL
PINPOINT AND REPAIR DEFECTIVE COMPONENTS.
CONTENTS
1. INTRODUCTION
1.1 PRECAUTIONS
1.2 PART NAMES
1.3 INITIAL CHECK
2. DISTINGUISH ERROR CAUSE
2.1 ERROR INDICATION
2.1.1 ERROR MESSAGES APPEARING ON THE LCD
3. ERROR CODES
3.1 ERROR INDICATION
3.2 ERROR CODE CAUSE AND REMEDY
4. PAPER FEEDING PROBLEMS
4.1 NO FEEDING
4.2 DOUBLE FEEDING
4.3 PAPER JAM
4.4 DIRT ON PAPER
4.5 WRINKLES OR CREASES
4.6 WAVES IN THE PAPER / FOLDS IN THE PAPER AT THE EJECT ROLLER 2
4.8 PRINTS ONLY SINGLE SIDE OF THE PAPER WHEN DUPLEX-PRINTING
5. TROUBLESHOOTING FOR PRINT IMAGE DEFECT FROM PC/USB/FAX RECEPTION
5.1 IMAGE DEFECT EXAMPLES
5.2 THE PITCH WHICH APPEARS IN THE IMAGE CAUSED BY FAILURE OF A ROLLER
5.3 TROUBLESHOOTING FOR IMAGE DEFECT
6. SOFTWARE SETTING PROBLEMS
7. NETWORK PROBLEMS
8. TROUBLESHOOTING OF THE COMMUNICATIONS ERRORS
9. TROUBLESHOOTING OF THE CONTROL PANEL
10. TROUBLESHOOTING OF FAX FUNCTIONS
11. DOCUMENT FEEDING PROBLEMS
11.1 NO FEEDING
11.2 DOUBLE FEEDING
11.3 PAPER JAM
11.4 WRINKLES
12. SCANNING IMAGE DEFECT TROUBLESHOOTING
12.1 IMAGE DEFECT EXAMPLES
12.2 TROUBLESHOOTING IMAGE DEFECT
13. OTHERS PROBLEMS

CHAPTER 4 PERIODICAL MAINTENANCE
CONTENTS
1. PERIODICAL MAINTENANCE PARTS
1.1 PERIODICAL MAINTENANCE PARTS
1.2 PROCEDURES TO REPLACE PERIODICAL MAINTENANCE PARTS
1.2.1 FUSER UNIT AND LASER UNIT
1.2.2 PAPER FEEDING KIT FOR TRAY 1, 2
1.2.3 PAPER FEEDING KIT FOR MP TRAY

CHAPTER 5 DISASSEMBLY/REASSEMBLY
THIS CHAPTER DETAILS PROCEDURES FOR DISASSEMBLING AND REASSEMBLING THE MACHINE TOGETHER
WITH RELATED NOTES. THE DISASSEMBLY ORDER FLOW PROVIDED ENABLES YOU TO SEE AT A GLANCE THE
QUICKEST WAY TO GET TO COMPONENT(S) INVOLVED.
AT THE START OF A DISASSEMBLY JOB, YOU CHECK THE DISASSEMBLY ORDER FLOW THAT GUIDES YOU
THROUGH A SHORTCUT TO THE OBJECT COMPONENTS.
THIS CHAPTER ALSO COVERS SCREW TIGHTENING TORQUES AND LUBRICATION POINTS TO WHICH THE
SPECIFIED LUBRICANTS SHOULD BE APPLIED DURING REASSEMBLY JOBS.
CONTENTS
1. SAFETY PRECAUTIONS
2. TRANSFERRING RECEIVED FAX DATA
3. SCREW TORQUE LIST
4. LUBRICATION
6. GEAR LAYOUT DRAWING
7. HARNESS ROUTING
8. DISASSEMBLY FLOW CHART
9. DISASSEMBLY PROCEDURE
9.1 PAPER TRAY
9.2 BACK COVER
9.3 REAR CHUTE ASSY
9.4 FUSER UNIT
9.5 TRAY MP ASSY
9.6 MP TRAY COVER ASSY / PROCESS COVER ASSY / EMBLEM COVER
9.7 ACCESS COVER / SIDE COVER L
9.8 ADF UNIT
9.8.1 ADF UNIT
9.8.2 HINGE ARM R
9.8.3 HINGE BASE R
9.8.4 HINGE ASSY L
9.8.5 ADF COVER ASSY
9.8.6 ADF SIDE COVER F
9.8.7 ADF SIDE COVER R
9.8.8 ADF CHUTE ASSY
9.8.9 SUB CHUTE ASSY / SX CHUTE
9.8.10 EXIT CHUTE COVER ASSY
9.8.11 EARTH SPRING
9.8.12 PF ROLLER HOLDER ASSY
9.8.13 LF ROLLER 1 ASSY
9.8.14 SWITCH BACK ROLLER ASSY
9.8.15 ADF MOTOR
9.8.16 SWITCH BACK SOLENOID ASSY
9.8.17 PF SOLENOID ASSY
9.8.18 ADF RELAY PCB
9.8.19 PAPER FEED CHUTE ASSY
9.8.20 DOCUMENT FRONT ACTUATOR 1 / DOCUMENT FRONT SENSOR 1
9.8.21 DOCUMENT FRONT ACTUATOR 2 / DOCUMENT FRONT SENSOR 2
9.8.22 ADF FILM / SPRING PLATE ADF FRONT A ASSY /
SEPARATION RUBBER / RUBBER HOLDER / SEPARATION SPRING
9.8.23 PRESSURE ROLLER / LF SPRING
9.8.24 LF ROLLER 2 ASSY
9.8.25 DOCUMENT EXIT ROLLER ASSY
9.8.26 LF ROLLER 3 ASSY
9.8.27 LF ROLLER 4 ASSY
9.8.28 FLAP A ASSY / FLAP A
9.8.29 DOCUMENT HOLD / DOCUMENT HOLD SPRING
9.8.30 UPPER MAIN CHUTE ASSY / LOWER MAIN CHUTE ASSY
9.8.31 DOCUMENT REAR ACTUATOR / DOCUMENT REAR SENSOR
9.8.32 FLAP B
9.8.33 ACTUATOR SWITCH BACK / SWITCH BACK SENSOR
9.8.34 DOCUMENT EJECT TRAY
9.8.35 DOCUMENT COVER SENSOR
9.8.36 EJECT ROLLER B4
9.8.37 PRESSURE ROLLER
9.9 PANEL COVER ASSY
9.9.1 PANEL COVER ASSY
9.10 SCANNER UNIT ASSY
9.10.1 SCANNER UNIT ASSY
9.10.2 TOP COVER ASSY
9.10.3 LOCK LEVER B / LOCK LEVER ASSY
9.10.4 CCD MODULE
9.10.5 FFC CABLE ASSY
9.10.6 SCANNER MOTOR FB
9.10.7 PULLEY ASSY
9.10.8 HOME POSITION SENSOR
9.11 PANEL UNIT
9.11.1 PANEL UNIT
9.11.2 PANEL PCB ASSY
9.11.3 PRINTED RUBBER KEY
9.11.4 LCD COVER / BACKLIGHT MODULE / LCD
9.12 NCU PCB ASSY
9.13 SPEAKER ASSY
9.14 DRIVER PCB
9.15 USB HOST PCB ASSY
9.16 SIDE COVER R
9.17 BATTERY
9.18 JOINT COVER ASSY
9.19 MAIN PCB
9.20 GEAR PLATE CALKING ASSY / DEVELOP JOINT / MAIN MOTOR ASSY
9.21 MAIN SHIELD PLATE ASSY
9.22 RELAY REAR PCB ASSY / TRAY 2 CONNECTOR
9.23 RELAY FRONT PCB ASSY
9.24 DRIVE RELEASE LINK
9.25 MP SOLENOID ASSY
9.26 TRAY 1 SOLENOID ASSY
9.27 TONER SENSOR PCB ASSY
9.28 REGISTER SOLENOID ASSY
9.29 EJECTOR SOLENOID ASSY
9.30 FRONT COVER SENSOR ASSY
9.31 NEW TONER ACTUATOR
9.32 GEAR 17/20/23
9.33 THERMISTOR ASSY
9.34 FILTER
9.35 LASER UNIT
9.36 LVPS PCB UNIT
9.37 HIGH-VOLTAGE PS PCB ASSY
9.38 TONER LED PCB UNIT ASSY
9.39 FAN MOTOR 60 UNIT
9.40 FAN MOTOR 60 UNIT LV
9.41 FRAME L ASSY
9.42 MP UNIT
9.43 REGIST ACTUATOR REAR / REGIST ACTUATOR SPRING
9.44 REGIST ACTUATOR FRONT / REGIST ACTUATOR SPRING
9.45 ROLLER HOLDER ASSY
9.46 PE ACTUATOR / EDGE ACTUATOR / EDGE ACTUATOR SPRING
9.47 PE EG SENSOR ASSY
10. DISASSEMBLY PROCEDURE OPTIONAL LOWER TRAY (PF-P10)
10.1 PAPER TRAY
10.2 TRAY 2 FRONT COVER ASSY
10.3 TRAY 2 REAR COVER
10.4 TRAY 2 SIDE COVER L
10.5 TRAY 2 SIDE COVER R
10.6 TRAY 2 PCB ASSY
10.7 CONNECTOR: 55533-1219
10.8 CONNECTOR: 54702-1219
10.9 GEAR 24 TRAY 2
10.10 COLLAR 6
10.11 TRAY 2 SOLENOID ASSY
10.12 ROLLER HOLDER ASSY
10.13 EDGE ACTUATOR SPRING
10.14 PE ACTUATOR / EDGE ACTUATOR
10.15 TRAY 2 SENSOR PCB ASSY

CHAPTER 6 SERVICE FUNCTIONS
THE MAINTENANCE MODE IS EXCLUSIVELY DESIGNED FOR THE PURPOSE OF CHECKS, SETTINGS AND
ADJUSTMENTS USING THE BUTTONS ON THE CONTROL PANEL OR OPEN/CLOSE OF THE FRONT COVER. YOU CAN
PERFORM OPERATIONAL CHECKS OF PANEL PCB, SENSORS, PERFORM A PRINT TEST, DISPLAY THE LOG
INFORMATION OR ERROR CODES.
CONTENTS
1. ENTRY INTO THE MAINTENANCE MODE
2. LIST OF MAINTENANCE-MODE FUNCTIONS
3. USER-ACCESS TO THE MAINTENANCE MODE
4. DETAILED DESCRIPTION OF MAINTENANCE-MODE FUNCTIONS
4.1 EEPROM PARAMETER INITIALIZATION (FUNCTION CODE 01/91)
4.2 PRINTOUT OF SCANNING COMPENSATION DATA (FUNCTION CODE 05)
4.3 PLACEMENT OF DOCUMENT SCANNER UNIT IN POSITION FOR TRANSPORTATION
(FUNCTION CODE 06)
4.4 ADF PERFORMANCE TEST (FUNCTION CODE 08)
4.5 TEST PATTERN 1 (FUNCTION CODE 09)
4.6 FIRMWARE SWITCH SETTING AND PRINTOUT
4.6.1 FIRMWARE SWITCH SETTING (FUNCTION CODE 10)
4.6.2 PRINTOUT OF FIRMWARE SWITCH DATA (FUNCTION CODE 11)
4.7 OPERATION CHECK OF LCD (FUNCTION CODE 12)
4.8 OPERATIONAL CHECK OF CONTROL PANEL BUTTON (FUNCTION CODE 13)
4.9 ROM VERSION CHECK (FUNCTION CODE 25)
4.10 SENSOR OPERATIONAL CHECK (FUNCTION CODE 32)
4.11 PC PRINT FUNCTION (FUNCTION CODE 43)
4.12 SWITCHING THE USB SETTING (FUNCTION CODE 45)
4.13 EEPROM CUSTOMIZING (USER-ACCESSIBLE) (FUNCTION CODE 52)
4.14 RECEIVED DATA TRANSFER FUNCTION (FUNCTION CODE 53)
4.15 FINE ADJUSTMENT OF SCAN START/END POSITIONS (FUNCTION CODE 54)
4.16 ACQUISITION OF WHITE LEVEL DATA
AND CCD SCANNER AREA SETTING (FUNCTION CODE 55)
4.17 PAPER FEEDING AND EJECTING TEST (FUNCTION CODE 67)
4.18 EEPROM CUSTOMIZING (FUNCTION CODE 74)
4.19 OPERATIONAL CHECK OF FANS (FUNCTION CODE 78)
4.20 DISPLAY OF THE MACHINES LOG INFORMATION (FUNCTION CODE 80)
4.21 ERROR CODE INDICATION (FUNCTION CODE 82)
4.22 OUTPUT OF TRANSMISSION LOG TO THE TELEPHONE LINE (FUNCTION CODE 87)
4.23 COUNTER RESET AFTER REPLACING THE FUSER UNIT,
LASER UNIT AND PAPER FEED KIT (FUNCTION CODE 88)
4.24 MAINTENANCE MODE FINISH (FUNCTION CODE 99)
5. OTHER SERVICE FUNCTIONS
5.1 RESETTING THE PERIODICAL MAINTENANCE PARTS LIFE
5.2 DEVELOP ROLLER / DEVELOPING BIAS VOLTAGE COUNTER RESET FUNCTION
5.3 DRUM CONDENSATION COUNTERMEASURE MODE
5.4 UNLOCKING AND CLEARING THE PASSWORD OF THE FUNCTION LOCK / SETTING LOCK
5.5 CLEARING THE DATA OF THE SECURE PRINT

CHAPTER 7 CIRCUIT DIAGRAMS, WIRING DIAGRAM
THIS CHAPTER PROVIDES THE CIRCUIT DIAGRAMS OF THE HIGH-VOLTAGE POWER SUPPLY PCB, LVPS PCB
AND NCU PCB AND THE WIRING DIAGRAMS THAT HELP YOU UNDERSTAND THE CONNECTIONS BETWEEN
PCBS.
CONTENTS
1. CIRCUIT DIAGRAMS
2. WIRING DIAGRAM

Number of pages: 508.