Xerox WorkCentre Pro 423 Service Manual page 147

U4-5 FUSER Abnormal (BSD 10.2)
Initial Action
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 connector P12-1 and P12-4. Is the
resistance less than 10Ÿ?
Y N
Replace the FUSER (PL6.1)
Return the FUSER ASSY and turn the power on.
Is the voltage 100 VAC J12-4(+)and J12-1(-)?
Y N
Cheat the R/H INTERLOCK SW. Is the voltage 100
VAC between the drawer connector J12-4(+) and J12-
1(-)?
Y N
Is the voltage 100 VAC between the POWER
UNIT J10-A1(+) and J10-A3(-)?
Y N
Is a CHOKE COIL or cheat connector
installed to the POWER UNIT P5? (100V
model)
Y N
Install the CHOKE COIL or cheat
connector.
Is the voltage 100 VAC between the
POWER UNIT FS-11(+) and FS-12(-) ?
Y N
Perform AC FIP.
A B C D E
WorkCentre Pro 423/428
A B C D E
Is the voltage 0 VDC between the POWER
UNIT J523-2(+) and GND(-) ?
Y N
Replace the POWER UNIT. (PL7.1)
Is the voltage 0 VDC between the
MCU/SW PWB J403-3(+) and GND(-) ?
Y N
Check between the 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 the POWER UNIT and R/H
INTERLOCK SW for an open wire or poor
contact. If there is no problem, 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 connector P12-A4 and P12-A5.
Is the resistance less than 20kŸ?
Y N
Replace the FUSER THERMISTOR. (PL2.3)
Check between the FUSER drawer connector and MCU/SW
PWB for an open wire or poor contact? There is no problem.
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)
03/02
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Level 2 Troubleshooting
CHAPTER 2 TROUBLESHOOTING