WorkCentre Pro 423/428
2-132
CHAPTER 2 TROUBLESHOOTING
03/02
Level 2 Troubleshooting
+5VDC POWER FIP (BSD 1.1 1.2 1.3 1.4)
Is the v5 VDC between the MCU/SW PWB J400-9(+)
and GND(-)?
Y
N
Is +5 VDC WIRE normal (no short circuit with the FRAME)?
Y
N
Repair the short circuit.
Is the v5 VDC between the MCU/SW PWB
J403-4(+) and GND(-)?
Y
N
Is the v5 VDC between the MCU/PWB
J400-10(+) and GND(-)?
Y
N
Is the v5 VDC between the POWER
UNIT J521-5(+) and GND(-)?
Y
N
Is the voltage 100 VAC between the
POWER UNIT J8-4(+) and J8-1(-)?
Y
N
Perform AC POWER FIP.
Check J400-10 between the POWER UNIT
J521-5 and MCU/PWB for a short circuit
of the WIRE to FRAME. If no problem is
found, replace the POWER UNIT.(PL7.1)
Check between the POWER UNIT J521-5 and
MCU/PWB J400-10 for an open wire or poor
contact.
Replace the MCU/SW PWB. (PL7.2)
Is the v5 VDC between the POWER UNIT
J523-1(+)and GND(-)?
Y
N
Check between the POWER UNIT J523-1 and MCU/
SW PWB J403-4 for an open wire or poor contact.
Replace the POWER UNIT. (PL7.1)
Check between the MCU/SW PWB and the corresponding part
for an open circuit or poor contact.
+3.3VDC POWER FIP (BSD 7.2 7.5)
Is the v3.3 VDC between the MCU/SW PWB J417-A7(+)
and GND(-)?
Y
N
Is +3.3 VDC WIRE normal (no short circuit with the
FRAME)?
Y
N
Repair the short circuit.
Is the v5 VDC between the MCU/SW PWB
J400-9(+) and GND(-)?
Y
N
P5VDC POWER FIP.
Replace the MCU/SW PWB. (PL7.2)
Check between the MCU/SW PWB and the corresponding part
for an open wire or poor contact.
ESS +3.3VDC POWER FIP (BSD 19.1)
Is the v3.3 VDC between the ESS PWB J300-1(+) and
GND(-)?
Y
N
Is the v3.3 VDC between the ESS LVPS J3502-
1(+) and GND(-)?
Y
N
Is +3.3 VDC WIRE normal (no short circuit with the
FRAME)?
Y
N
Repair the short circuit.
Is the voltage 100 VAC between the ESS LVPS J802-
1(+) and J802-3(-)?
Y
N
Is the voltage 100 VAC between the ESS
relayconnector J15-1(+) and J15-2(-)?
Y
N
Is the voltage 100 VAC between the
POWER UNIT J2-1(+) and J2-2(-)?
Y
N
Replace the POWER UNIT. (PL7.1)
Check between the ESS relay connector
and POWER UNIT for an open wire or poor
contact.
Check between the ESS relay connector and
ESS LVPS for an open wire or poor contact.
Replace the ESS LVPS. (PL7.5)
Check between the ESS LVPS and the corresponding part
for an open wire or poor contact.
Check between the ESS 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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