Epson AcuLaser C2900N Service Manual page 123

Chapter 1 Troubleshooting
FIP-1.56 092-661: IOT Environment Sensor Error
Step
Possible causative parts:
SENSOR HUM (PL8.2.7)
PWBA MCU (PL8.2.13)
HARN ASSY HUM (PL9.1.6)
Does the error still occur when the power is turned OFF and
1
ON?
Checking after resetting the SENSOR HUM.
Reseat the SENSOR HUM.
2
Does the error still occur when the power is turned OFF and
ON?
Checking the HARN ASSY HUM for continuity.
Disconnect J20 from the PWBA MCU.
Disconnect J201 from the SENSOR HUM.
Is each cable of J20 <=> J201 continuous?
3
Checking the power to SENSOR HUM.
Disconnect the connector of J20 from the PWBA MCU.
4
Is the voltage across P20-4pin <=> ground on the PWBA
MCU, about +5 VDC?
Epson AcuLaser C2900N
Check
1 - 110
Remedy
Yes
Go to step 2. End of work.
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
No
Confidential