Xerox WorkCentre Pro 423 Service Manual

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?
YN
Execute Chain4 Func2. Is the voltage between
POWER UNIT J524-1 (+) and GND(-) 0VDC?
YN
Execute Chain4 Func2. Is the voltage between
MCU/SW PWB J403-8 (+) and GND(-) 0VDC?
YN
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?
YN
Is the voltage between MCU/SW PWB J403-5(+)
GND(-) +3.3VDC?
YN
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?
YN
Is the voltage between CARRIAGE MOTOR DRIVE PWB
J749-1(+) and GND(-) +24VDC?
YN
Is the voltage between CARRIAGE MOTOR DRIVE
PWB J748-1(+) and GND(-) +24VDC?
YN
Is the voltage between IIT/IPS PWB
J735-12(+) and GND(-) +24VDC?
YN
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?
YN
Is the voltage between IIT/IPS PWB J735-8(+) and
GND(-) +5VDC?
YN
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?
YN
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)?
YN
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?
YN
Is the voltage between Carriage Motor Drive PWB
J749-1(+) and GND(-) +24VDC?
YN
Is the voltage between Carriage Motor Drive
PWB J748-1(+) and GND(-) +24VDC?
YN
Is the voltage between IIT/IPS PWB J735-12(+)
And GND(-) +24VDC?
YN
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?
YN
Is the voltage between IIT/IPS PWB J735-8(+) and
GND(-) +5VDC?
YN
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?
YN
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)?
YN
Perform the general-purpose transmission sensor FIP.
Replace the MCU/SW PWB. (PL7.2)

Xerox WorkCentre Pro 423 Specifications

General

Brand	Xerox
Model	WorkCentre Pro 423
Category	All in One Printer
Language	English