2-26 Service Manual
4025-XXX
Error Code 929
A CRU memory communication error occurred.
Logic Control on the MCU PWB could not access CRU Memory data.
Step Actions and Questions Yes No
1 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?
Go to step 2 Go to the
“Printer
Wiring
Diagrams”
on page 5-14
to
troubleshoot a
loss of +5VDC
2 CRU REPLACEMENT
Replace the EP Cartridge with a different one.
Does the error code still appear?
Go to step 3 Problem
solved
3 MCU PWB REPLACEMENT
Replace the “Engine Board (MCU PWB)” on page 4-92.
Does the error code appear?
Go to step 4 Problem
solved
4 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 “I/O PWB” on page 4-89.
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