WorkCentre Pro 423/428
2-114
CHAPTER 2 TROUBLESHOOTING
03/02
Level 2 Troubleshooting
U4-3 FUSER Abnormal (BSD 10.2)
Initial Action
l
Check the drawer connector (P/J12) between the FUSER
ASSY and main unit for a broken or bent pin, foreign matter,
or burnt material.
Turn the power off and remove the FUSER ASSY. Measure the
resistance between drawer connectors P12-A4 and P12-A5. Is
the resistance 100k
or more?
Y
N
Check between the drawer connectors J12 and MCU/SW
PWB J402 for an open wire or poor contact. If there is no
problem, replace the MCU/SW PWB. (PL7.2)
Replace the FUSER (PL6.1).
U4-4 FUSER Abnormal (BSD 10.2)
Initial Action
l
Check the drawer connector (P/J12) between the FUSER
ASSY and main unit for a broken or bent pin, foreign matter,
or burn.
Cheat the FRONT DOOR INTERLOCK SW and turn the power
on.
Does the HEATER ROD light?
Y
N
Remove the FUSER ASSY. Measure the resistance
between drawer connectors P12-1 and P12-4. Is the
resistance 10
or more?
Y
N
Replace the FUSER (PL6.1)
Return the FUSER ASSY and turn the power on. Is the
Voltage 100VAC between drawer connectors J12-4(+) and
J12-1(-)?
Y
N
Cheat the R/H INTERLOCK SW. Is the voltage
100VAC between drawer connector J12-4(+) and J12-
1(-)?
Y
N
Is the voltage 100 VAC between the POWER
UNIT J10-A1(+) and J10-A3(-)?
Y
N
Is a CHOKE COIL or cheat connector
installed to POWER UNIT P5? (100V
model)
Y
N
Install a CHOKE COIL or cheat
connector.
Is the voltage 100 VAC between the
POWER UNIT FS-11(+) and FS-12(-)?
Y
N
Perform AC FIP.
A
B
C
D
E
A
B
C
D
E
Is the voltage 0 VDC between POWER
UNIT J523-2(+) and GND(-) ?
Y
N
Replace the POWER UNIT.(PL7.1)
Is the voltage 0 VDC between the
MCU/SW PWB J403-3(+) and GND(-) ?
Y
N
Check between MCU/SW PWB J403-
3 and POWER UNIT J523-2 for an
open wire or poor contact.
Replace the MCU/ SW PWB.(PL7.2)
Check between the POWER UNIT and R/H
INTERLOCK SW for an open wire or poor
connection. If there is no problem, replacethe
R/H INTERLOCK SW.(PL2.3)
Check the actuator at the R/H INTERLOCK SW.
Check the drawer connector (P/J12) for bad contact.
Remove the FUSER ASSY. Measure the resistance between
drawer connectors P12-A4 and P12-A5.
Is the resistance less than 20k
?
Y
N
Replace the FUSER (PL6.1).
Check between the FUSER drawer connector and MCU/SW
PWB for an open wire or poor contact. There is no problem?
Y
N
Repair an open wire or poor contact.
Check the NVM values by Chain20 Func100 and Chain20
Func101.
Are the values between 0 and 16?
Y
N
Change the NVM values. The initial values are 8.
Replace the MCU/SW PWB (PL7.2)
Summary of Contents for WorkCentre Pro 423
Page 2: ......
Page 3: ...WorkCentre Pro 423 428 6HUYLFH 0DQXDO...
Page 6: ......
Page 8: ......
Page 9: ...INTRODUCTION...
Page 10: ......
Page 24: ...WorkCentre 423 428 03 02 INTRODUCTION 14 7 Translation of Warnings...
Page 25: ...CHAPTER 1 SERVICE CALL PROCEDURE...
Page 26: ......
Page 28: ...WorkCentre Pro 423 428 1 2 CHAPTER 1 SERVICE CALL PROCEDURE 03 02 1 1 Trimming...
Page 31: ...CHAPTER 2 TROUBLESHOOTING...
Page 32: ......
Page 76: ...WorkCentre Pro 423 428 2 44 CHAPTER 2 TROUBLESHOOTING 03 02 2 3 Level 2 Troubleshooting...
Page 243: ...CHAPTER 3 IMAGE QUALITY TROUBLESHOOTING...
Page 244: ......
Page 273: ...CHAPTER 4 DISASSEMBLY ASSEMBLY AND ADJUSTMENT...
Page 274: ......
Page 329: ...CHAPTER 5 PARTS LIST...
Page 330: ......
Page 415: ...03 02 5 2 Parts List WorkCentre Pro 423 428 5 85 CHAPTER 5 PARTS LIST...
Page 416: ...CHAPTER 6 GENERAL...
Page 417: ......
Page 456: ...CHAPTER 7 ELECTRICAL WIRING DIAGRAMS...
Page 457: ......
Page 476: ...CHAPTER 8 ACCESSORIES...
Page 477: ......
Page 535: ...WorkCentre Pro 423 428 8 58 CHAPTER 8 ACCESSORIES 03 02 8 22 Stamp Kit Red...
Page 536: ...CHAPTER 9 BSD Block Schematic Diagram...
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