Xerox WorkCentre 5022 Service Manual page 135

072-215 MCU-STM Communication Fail
BSD-ON: CH3.2
Communication failure between the ESS/MCU PWB and the STM PWB was detected.
Cause/Action
1. Turn the power OFF and ON.
2. Turn OFF the power and check the connection between the ESS/MCU PWB J413 and
the STM PWB J541C for open circuit, short circuit, and poor contact.
3. If no problem is found, replace the following parts in sequence:
• STM PWB (PL 10.6)
• ESS/MCU PWB (PL 18.3)
Version 1.0
WC 5022/5024
072-461 STM NVM Out-Of-Order
BSD-ON: CH3.2
The NVM of the STM is malfunctioning.
NOTE: If this is already detected, it will be displayed on the UI Panel when a Job is being per-
formed.
Initial Actions
Refer to the BSD and check the related connectors of the target electrical parts for partial con-
nections.
Cause/Action
1. Turn the power OFF and ON.
2. If the problem persists, replace the STM PWB (PL 10.6).
06/2014
072-215 MCU-STM Communication Fail
2-113
Status Indicator RAPs