Xerox WorkCentre Pro 423 Service Manual page 145

U4-1 FUSER abnormal (BSD 10.2)
Initial Check
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 within 10Ÿ?
Y N
Replace the FUSER. (PL6.1)
Return the FUSER ASSY and turn the power on.
Is the voltage between drawer connectors J12-4(+) and
J12-1(-) 100VAC?
Y N
Cheat the R/H Interlock SW. Is the voltage between
drawer connectors J12-4(+) J12-1(-) 100VAC?
Y N
Is the voltage between POWER UNIT J10-A1(+)
and J10-A3(-) 100VAC?
Y N
Is a Choke Coil or cheat connector installed
to POWER UNIT P5?(100V model)
Y N
Install the CHOKE COIL or cheat
connector.
Is the voltage between POWER UNIT FS-
11(+) and FS-12(-) 100VAC?
Y N
Perform AC FIP.
Is the voltage between POWER UNIT
J523-2(+) and GND(-) 0VDC?
A B C D E
WorkCentre Pro 423/428
A B C D E
Y N 1205
Replace the POWER UNIT (PL7.1).
Is the voltage between MCU/SW PWB
J403-3(+) and GND(-) 0VDC?
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 POWER UNIT and R/H Interlock
SW for an open wire or poor contact.
If they good, replace the 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 20kŸ?
Y N
Replace the FUSER. (PL6.1)
Check between FUSER drawer connector and MCU/SW PWB
for an open wire or poor contact?
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)
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U4-2 FUSER abnormal (BSD 10.2)
To clear this error, set the Chain50 Func20 value to 0.
Turn the power off and wait until the FUSER ASSY cools down
well.
Is the resistance within 2kŸ between drawer connectors P12-A4
and P12-A5?
Y N
Install the FUSER ASSY, cheat the FRONT INTERLOCK
SW, and turn the power on.
Is the HEATER ROD continuously lit until an error occurs?
Y N
Replace the MCU/SW PWB. (PL7.2)
Clear the error and turn the power on.
Is the voltage between MCU/SW PWB J403-3(+) and
GND(-) +5VDC until an error occurs?
Y N
Replace the POWER UNIT. (PL7.1)
Replace the MCU/SW PWB. (PL7.2)
Replace the FUSER. (PL6.1)
Level 2 Troubleshooting
CHAPTER 2 TROUBLESHOOTING