Lexmark W820 Service Manual page 135

Step Actions and Questions
3 HCF INTERFACE CABLE INSPECTION
Check the HCF to printer interface cable.
Is the cable firmly connected to the P/J at the rear of the
printer?
4 APPLICATION SOFTWARE
If possible, run a Tray 3, Tray 4, and Tray 5 print job from a
different application.
Does the printer process the print request?
5 DRIVER SOFTWARE RELOAD
1. Reload the printer driver software.
2. Run a Tray 3, Tray 4, and Tray 5 print job from the host computer.
Does the printer process the print request?
6 HCF +5VDC VOLTAGE CHECK
1. Remove the HCF Rear Cover.
2. Measure the voltage between J480-1 and FG (frame ground),
between J480-2 and FG, and between J480-5 and FG on the HCF
PWB.
Is there +5VDC between J480-1 and FG, between J480-2
and FG, and between J480-5 and FG?
7 HCF +24VDC VOLTAGE CHECK
Measure the voltage between J480-7 and FG (frame ground)
and between J480-8 and FG on the HCF PWB.
Is there +24VDC between J480-7 and FG and between
J480-8 and FG?
4025 Options
Yes No
Go to step 4 Reconnect
the interface
cable
Reload Go to step 5
application
software
Problem Go to step 6
solved
Go to step 7 Go to the
printer service
manual and
troubleshoot
for a loss of
+5VDC from
the MCU
PWB
Go to step 8 Go to the
printer service
manual and
troubleshoot
for a loss of
+24VDC from
the MCU
PWB
Diagnostic Information
2-53