Epson AcuLaser C2900N Service Manual page 69

Chapter 1 Troubleshooting
FIP-1.28 042-700:IOT Over Heat Stop
Step
Possible causative parts:
SENSOR HUM (PL8.2.7)
PWBA MCU (PL8.2.13)
HARN ASSY HUM (PL9.1.6)
Checking the connectors for connection.
Check the connections between the PWBA MCU and
1
SENSOR HUM.
Are P/J20 and P/J201 connected surely?
Does the error still occur when the power is turned off and
2
on?
Checking the HARN ASSY HUM for continuity.
Disconnect P/J20 from the PWBA MCU.
3
Disconnect P/J201 from the SENSOR HUM.
Is each cable of P/J20 <=> P/J201 continuous?
Checking the output power of SENSOR HUM.
Disconnect P/J20 on the PWBA MCU.
4
Is the voltage across ground <=> J20-4pin on the PWBA
MCU, about +5VDC?
Epson AcuLaser C2900N
Check
1 - 56
Remedy
Yes
Reconnect the
connector(s) P/
Go to step 3. J20 and/or P/
J201 surely, then
go to step 2
Go to step 3. End of work.
Replace the
Go to step 4. HARN ASSY
HUM.
Replace the Replace the
SENSOR HUM. PWBA MCU.
(Refer to RRP8.7.) (Refer to RRP8.9.)
Revision B
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