Service manual

4-4 QMS 3260/4032 Laser Printer - Base Engine Technical Manual
Release Version 11-97
Primary Fault Isolation Procedures
4.1 Inoperative Printer continued
Step Actions and Questions Yes No
5
LVPS +24VDC CHECK
Measure the voltage between J400-5 and FG, and between
J400-6 and FG on the MCU PWB.
Is there +24VDC between J400-5 and FG, and is there
+24VDC between J400-6 and FG?
Go step 8 Go to step 6
6
AC POWER IN CHECK
Measure the voltage between J19-1 and J19-3 on the Noise
Filter PWB.
Is there 110VAC between J19-1 and J19-3?
Go to step 7 Replace the
Noise Filter
PWB (RRP
9.5)
7
AC POWER TO LVPS CHECK
Measure the voltage between J20-1 and J20-3 on the AC Drive
PWB.
Is there 110VAC between J20-1 and J20-3?
Replace the
LVPS Assem-
bly (RRP 9.2)
Replace the
Main Power
Switch (RRP
9.1)
8
OPTION ISOLATION
Remove all options, such as the Duplex Unit or the High
Capacity Feeder, from the base printer.
Do the Control Panel LEDs light up and does the printer
go into warm-up?
Replace the
options one
by one until
the printer
becomes
inoperative
again. Go to
the Technical
Manual of the
problem
option and
troubleshoot
for possible
electrical
short.
Go to Suspect
Components