Epson AcuLaser C2900N Service Manual page 59

Chapter 1 Troubleshooting
FIP-1.20 024-371: MCU-ESS Communication Fail
Step
Possible causative parts:
PWBA ESS SFP (PL8.1.7)
PWBA MCU (PL8.2.13)
HARNESS ASSY ESS MG SFP (PL9.1.1)
Checking after resetting the PWBA ESS SFP and PWBA
MCU.
1 Reseat the PWBA ESS SFP and PWBA MCU.
Does the error still occur when the power is turned OFF and
ON?
Checking the connectors for connection.
Check the connections between the PWBA MCU and
PWBA ESS SFP.
Are P/J10 and P/J101 connected correctly?
2
Does the error still occur when the power is turned OFF and
3
ON?
Checking the HARNESS ASSY ESS MG SFP for continuity.
Disconnect J10 from the PWBA MCU.
4
Disconnect J101 from the PWBA ESS SFP.
Is each cable of J10 <=> J101 continuous?
Checking the firmware version
5
Is the firmware the latest version?
Checking after replacing the PWBA MCU.
Replace the PWBA MCU. (Refer to RRP8.9.)
6
Does the error still occur when the power is turned OFF and
ON?
Epson AcuLaser C2900N
Check
1 - 46
Remedy
Yes
Go to step 2. End of work.
Reconnect the
connector(s) P/
Go to step 4. J10 and/or P/J101
correctly, then go
to step 3.
Go to step 4. End of work.
Replace the
Go to step 5. HARNESS ASSY
ESS MG SFP.
Upgrade the
Go to step 6.
firmware.
Replace the
PWBA ESS SFP. End of work.
(Refer to RRP8.3.)
Revision B
No
Confidential