3-92 Phaser 7400 Color Printer Service ManualTemp Sensor FailureThe Temperature Sensor has failed.Applicable Status Code:Code T29: Temperature Sensor FailureInitial Actions:■ Cycle the printer's power.■ If the problem persists follow the procedure below.Troubleshooting Reference TableApplicable Parts Wiring and Plug/Jack References■ Temp/Humidity Sensor, PL8.1.80■ ENV Harness, PL8.1.81■ Engine Control Board, PL1.1.4■ Print Engine Map 2 (page 10-5)■ Print Engine Map 9 (page 10-12)■ Print Engine Front Sensor Board (1/2) (page 10-26)Troubleshooting Procedure TableStep Actions and Questions Yes No1 Test the Temp/Humidity Sensor.1. Run the Service Diagnostics AmbientTemp/Hum Sensor test.2. Verify proper operation by blowing onthe sensor.Is the sensor operating correctly?Replace the EngineControl Board(page 8-112).Go to Step 2.2 Replace the Temp/Humidity Sensor.Does the error persist?Go to Step 3. Complete.3 Check the ENV harness connection.Is the ENV Harness connected?Go to Step 4. Reconnect theharness.4 Check all pins on the ENV Harness forcontinuity.1. Disconnect ENV and P/J420.2. Check continuity between ENV <=>J420.Go to Step 5. Replace the ENVHarness.5 Check the Temp/Humidity Sensor signal.Is there voltage present at FSNS-17 whenthe sensor is active?Go to Step 6. Replace the FrontSensor Board(page 8-150).6 Check all pins on the FSNS HarnessPL4.2.98 for continuity.1. Disconnect FSNS.2. Check continuity on all contacts.Replace the MotorDriver Board(page 8-141).Replace the FSNSHarness.
