Rh Sensor Failure - Xerox Phaser 7400 Service Manual

RH Sensor Failure

Applicable Status Code:
Code T30:
Humidity Sensor Failure
Code T31:
Condensation detected in the printer.
Initial Actions:
Cycle the printer's power.
If the problem persists follow the procedure below.
Troubleshooting Reference Table
Applicable Parts
Temp/Humidity Sensor, PL8.1.80
ENV Harness, PL8.1.81
Engine Control Board, PL1.1.4
Troubleshooting Procedure Table
Step Actions and Questions
1 Test the Temp/Humidity Sensor.
1. Run the Service Diagnostics Ambient
Temp/Hum Sensor test.
2. Verify proper operation by blowing on
the sensor.
Is the sensor operating correctly?
2
Replace the Temp/Humidity Sensor.
Does the error persist?
3 Check the ENV harness connection.
Is the ENV Harness connected to the Front
Sensor Board?
4 Check all pins on the ENV Harness
PL8.1.81 for continuity.
1. Disconnect ENV and P/J420.
2. Check continuity between ENV <=>
J420.
5 Check the Temp/Humidity Sensor signal.
Is there voltage present at FSNS-15 when
the sensor is active?
6 Check all pins on the FSNS Harness
PL4.2.98 for continuity.
1. Disconnect FSNS.
2. Check continuity on all contacts.
Error Messages and Codes
Wiring and Plug/Jack References
Print Engine Map 2 (page 10-5)
Print Engine Map 9 (page 10-12)
Print Engine Front Sensor Board (1/2) (page 10-26)
Yes
Replace the Engine
Control Board
(page 8-112).
Go to Step 3.
Go to Step 4.
Go to Step 5.
Go to Step 6.
Replace the Motor
Driver Board
(page 8-141).
No
Go to Step 2.
Complete.
Reconnect the
harness.
Replace the ENV
Harness.
Replace the Front
Sensor Board
(page 8-150).
Replace the FSNS
Harness.
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