08/2012
2-38
WorkCentre 5021/5019
072-215
Initial Issue
Status Indicator RAPs
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 18.1)
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