Lexmark W820 Service Manual page 123

Error Code 930
There is a problem with the Start of Scan (SOS) Sensor.
Logic Control on the MCU PWB detected that the time between signals from the Start of
Scan Sensor was longer than specified.
Step Actions and Questions
1 RESET
1. Switch off printer main power.
2. Wait one minute.
3. Switch on printer main power.
Does the 930 error code appear?
2 LVPS +5VDC CHECK
Measure the voltage between J400-1 and FG, and between
J400-2 and FG on the MCU PWB.
Is there +5VDC between J400-1 and FG, and +5VDC
between J400-2 and FG?
3 MCU PWB REPLACEMENT
Replace the "Engine Board (MCU PWB)" on page 4-92
Does the error code appear?
4 PRINTHEAD REPLACEMENT
Replace the "Printhead Assembly" on page 4-57
Does the error code appear?
5 The following printer FRUs and areas are associated with this
specific problem. One or more of these FRUs or areas may
have failed partially or completely. If you cannot isolate this
problem using the steps in this Service Check, replace each
FRU or troubleshoot each area listed below, one at a time, until
you isolate and solve the problem.
•
Wiring and connectors linking the FRUs
•
I/O PWB - Go to
4025-XXX
"I/O PWB" on page 4-89.
Yes No
Go to step 2 Suspect an
intermittent
problem with
the MCU
PWB, the
Laser Diode
PWB, the
SOS Sensor,
or the
connectors
and wiring
linking these
FRUs.
Go to step 3 Go to the
"Printer
Wiring
Diagrams"
on page 5-14
to
troubleshoot a
loss of +5VDC
Go to step 4 Problem
solved
Go to step 5 Problem
solved
Diagnostic Information
2-27