03/02
Level 2 Troubleshooting
WorkCentre Pro 423/428
2-111
CHAPTER 2 TROUBLESHOOTING
U1-3 LVPS FAN failure (BSD 1.2)
Enter Diag. Mode and execute Chain4 Func2.
Does the LVPS FAN rotate at high speed?
Y
N
Execute Chain4 Func2. Is the voltage between
POWER UNIT J524-1 (+) and GND(-) 0VDC?
Y
N
Execute Chain4 Func2. Is the voltage between
MCU/SW PWB J403-8 (+) and GND(-) 0VDC?
Y
N
Replace the MCU/SW PWB. (PL7.2)
Check between MCU/SW PWB and POWER UNIT
for an open wire or poor contact.
Replace the POWER UNIT. (PL7.1)
Is the voltage between POWER UNIT J524-5(+) and GND(-)
+3.3VDC?
Y
N
Is the voltage between MCU/SW PWB J403-5(+)
GND(-) +3.3VDC?
Y
N
Replace the MCU/SW PWB. (PL7.2)
Check between MCU/SW PWB and POWER UNIT for an
open wire or poor contact.
Replace the POWER UNIT. (PL7.1)
U2-1 Carriage Abnormal (BSD 6.2)
Enter Diag. Mode and execute Chain6 Func1.
Does the Carriage operate?
Y
N
Is the voltage between CARRIAGE MOTOR DRIVE PWB
J749-1(+) and GND(-) +24VDC?
Y
N
Is the voltage between CARRIAGE MOTOR DRIVE
PWB J748-1(+) and GND(-) +24VDC?
Y
N
Is the voltage between IIT/IPS PWB
J735-12(+) and GND(-) +24VDC?
Y
N
Replace the IIT/IPS PWB. (PL3.1)
Check between IIT/IPS & CARRIAGE MOTOR
DRIVE PWB for an open wire or poor contact.
Replace the CARRIAGE MOTOR DRIVE PWB.(PL3.1)
Is the voltage between CARRIAGE MOTOR DRIVE PWB
J748-5(+) and GND(-) +5VDC?
Y
N
Is the voltage between IIT/IPS PWB J735-8(+) and
GND(-) +5VDC?
Y
N
Replace the IIT/IPS PWB. (PL3.1)
Check between IIT/IPS PWB & CARRIAGE MOTOR
DRIVE PWB for an open wire or poor contact.
Che ck between CARRIAGE MOTOR DRIVE PWB J748
and IIT/IPS PWB J735 for an open wire or poor contact.
Are they good?
Y
N
Repair an open wire or poor contact.
Replace CARRIAGE MOTOR DRIVE PWB(PL3.1)and
CARRIAGE MOTOR(PL3.3) in this order.
Execute Chain6 Func11. Move the carriage to the right and left.
Does the display change (H/L)?
Y
N
Perform the general-purpose transmission sensor FIP.
Replace the MCU/SW PWB. (PL7.2)
U2-2 Carriage Abnormal (BSD 6.2)
Enter Diag. Mode and execute Chain6 Func1.
Does the Carriage operate?
Y
N
Is the voltage between Carriage Motor Drive PWB
J749-1(+) and GND(-) +24VDC?
Y
N
Is the voltage between Carriage Motor Drive
PWB J748-1(+) and GND(-) +24VDC?
Y
N
Is the voltage between IIT/IPS PWB J735-12(+)
And GND(-) +24VDC?
Y
N
Replace the IIT/IPS PWB. (PL3.1)
Check between IIT/IPS and Carriage Motor
Drive PWB for an open wire or poor contact.
Replace the Carriage Motor Drive PWB. (PL3.1)
Is the voltage between Carriage Motor Drive PWB
J748-5(+) and GND(-) +5VDC?
Y
N
Is the voltage between IIT/IPS PWB J735-8(+) and
GND(-) +5VDC?
Y
N
Replace the IIT/IPS PWB. (PL3.1)
Check between IIT/IPS PWB and Carriage Motor
Drive PWB for an open wire or poor contact.
Check between Carriage Motor Drive PWB J748 and
IIT/IPS PWB J735 for an open wire or poor contact.
Are they good?
Y
N
Repair an open wire or poor contact.
Replace the Carriage Motor DRIVE PWB.(PL3.1) If the
problem persists, replace the CARRIAGE MOTOR.(PL3.3)
Execute Chain6 Func11. Move the carriage to the right left.
Does the display change (H/L)?
Y
N
Perform the general-purpose transmission sensor FIP.
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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