03/02
Level 2 Troubleshooting
WorkCentre Pro 423/428
2-133
CHAPTER 2 TROUBLESHOOTING
MF +12VDC POWER FIP (BSD 19.1)
Is the v12 VDC between the MF MAIN PWB J300-5(+)
and GND(-)?
Y
N
Is the v12 VDC between the MF LVPS J507-5(+)
and GND(-)?
Y
N
Is +12 VDC WIRE normal (no short circuit with the
FRAME)?
Y
N
Repair the short circuit.
Is the voltage 100 VAC between the MF LVPS
J3A-4(+) and J3A-3(-)?
Y
N
Is the voltage 100 VAC between the MF relay
connector J14-1(+) and J4-2(-)?
Y
N
Is the voltage 100 VAC between the
POWER UNIT J1-1(+) and J1-4(-)?
Y
N
Replace the POWER UNIT. (PL7.1)
Check between the POWER UNIT and
MF relay connector for an open wire or
poor contact.
Check between the MF relay connector and MF
LVPS for an open wire or poor contact.
Replace the MF LVPS. (PL7.4)
Check between the MF LVPS and MF MAIN PWB for an
open wire or poor contact.
Check between the MF MAIN PWB and the corresponding part
for an open wire or poor contact.
MF +5VDC POWER FIP (BSD 19.1)
Is the v5 VDC between the MF MAIN PWB J300-1(+)
and GND(-)?
Y
N
Is the v5 VDC between the MF LVPS J507-1(+)
and GND(-)?
Y
N
Is +5 VDC WIRE normal (no short circuit with the
FRAME)?
Y
N
Repair the short circuit.
Is the voltage 100 VAC between the MF LVPS
J3A-4(+) and J3A-3(-)?
Y
N
Is the voltage 100 VAC between the MF relay
connector J14-1(+) and J4-2(-)?
Y
N
Is the voltage 100 VAC between the
POWER UNIT J1-1(+) and J1-4(-)?
Y
N
Replace the POWER UNIT. (PL7.1)
Check between the POWER UNIT and MF
relay connector for an open wire or poor
contact.
Check between the MF relay connector and MF
LVPS for an open wire or poor contact.
Replace the MF LVPS. (PL7.4)
Check between the MF LVPS and MF MAIN PWB for an
open wire or poor contact.
Check between the MF MAIN PWB and the corresponding part
for an open wire or poor contact.
MF -12VDC POWER FIP (BSD 19.1)
Is the voltage -12 VDC between the MF MAIN PWB J300-6(+)
and GND(-)?
Y
N
Is the voltage -12 VDC between the MF LVPS J507-6(+)
and GND(-)?
Y
N
Is -12 VDC WIRE normal (no short circuit with the
FRAME)?
Y
N
Repair the short circuit.
Is the voltage 100 VAC between the MF LVPS
J3A-4(+) and J3A-3(-)?
Y
N
Is the voltage 100 VAC between the MF relay
connector J14-1(+) and J4-2(-)?
Y
N
Is the voltage 100 VAC between the
POWER UNIT J1-1(+) and J1-4(-)?
Y
N
Replace the POWER UNIT. (PL7.1)
Check between the POWER UNIT and
MF relay connector for an open wire or
poor contact.
Check between the MF relay connector and
MF LVPS for an open wire or poor contact.
Replace the MF LVPS. (PL7.4)
Check between the MF LVPS and MF MAIN PWB for
an open wire or poor contact.
Check between the MF MAIN PWB and the corresponding part
for an open wire or poor contact.
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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