Epson AcuLaser C2900N Service Manual page 62

Chapter 1 Troubleshooting
FIP-1.23 041-340: IOT NVRAM Error
If the error occurred after replacing the PWBA MCU, transfer the internal data of the old
PWBA MCU to a new one.
Step
Possible causative parts:
DRUM CARTRIDGE (PL4.1.21)
PWBA MCU (PL8.2.13)
HARN ASSY PHD XPRO (PL9.1.11)
Does the error still occur after several ON/OFF procedures
1
of the power?
Checking after resetting the DRUM CARTRIDGE and
TONER CARTRIDGEs.
Reseat the DRUM CARTRIDGE and four TONER
2
CARTRIDGEs.
Does the error still occur when the power is turned OFF and
ON?
Checking after resetting the PWBA MCU.
Reseat the PWBA MCU.
3
Does the error still occur when the power is turned OFF and
ON?
Checking the connectors for connection.
Check the connections between the PWBA EEPROM and
4
PWBA MCU.
Are P/J 144, and P/J 42 connected surely?
Does the error still occur when the power is turned OFF and
5
ON?
Checking the HARN ASSY PHD XPRO for continuity.
Disconnect J42 from the PWBA MCU.
6
Disconnect J144 from the PWBA EEPROM (XPRO).
Is each cable of J42 <=> J144 continuous?
Checking after replacing the PWBA MCU.
Replace the PWBA MCU. (Refer to RRP8.9.)
7
Does the error still occur when the power is turned OFF and
ON?
*1: Though some kind of foreign noise would be possible cause, go to FIP Electrical Noise in Other FIP
and check, to make sure.
Epson AcuLaser C2900N
Check
1 - 49
Remedy
Yes
Go to step 2. End of work. *1
Go to step 3. End of work. *1
Go to step 4. End of work. *1
Reconnect the
connector(s) P/
Go to step 6. J42 and P/J144
surely, then go to
step 5.
Go to step 6. End of work.
Replace the
Go to step 7. HARN ASSY PHD
XPRO.
Go to Electrical
End of work.
Noise.
Revision B
No
Confidential