Faulty Temperature Sensor Rap - Xerox Phaser 790 Service Manual

010-701 Faulty Temperature Sensor RAP

The Temperature Sensor has failed to read the Fuser Temperature correctly. A Temperature
Sensor error has been declared.
Initial Actions
Inspect the Fuser area for debris and other signs of wear, breakage or excessive heat damage.
Procedure
Pull out Area 5. A resistance of approximately 200k ohms is measured between J71 pin
B4 and J71 pin B6 when the Temperature Sensor is at room temperature.
Y N
Disconnect P/J 72. A resistance of approximately 200k ohms is measured between
P72 pin 2 and pin 4 when the Temperature Sensor is at approximately room temper-
ature.
Y N
Replace the Temperature Sensor (PL 8.2).
Reconnect P/J 72. A resistance of approximately 200k ohms is measured between
J71-B4 and B6 when the Temperature Sensor is at approximately room tempera-
ture.
Y N
Go to Flag 1. Check the wiring for an open circuit or a short circuit to ground. Repair
or replace the Fuser Harness (PL 8.5) as required. If the problem persists, replace
the Temperature Sensor (PL 8.2). If the problem still persists, replace the MCU PWB
(PL 11.2).
Go to Flag 2. Check for an open circuit or a short circuit to ground. Repair or replace the
Main Harness (PL 11.1) as required. If the wiring is OK, replace the MCU PWB (PL 11.2).
The problem may be intermittent. Go to Figure 1. Check for loose or damaged connections or
damaged wires. Repair or replace the Fuser Harness (PL 8.5) or the Main Harness (PL 11.1)
as required. If the wiring is OK and the problem persists, replace the Temperature Sensor (PL
8.2). If the problem still persists, replace the MCU PWB (PL 11.2).
Status Indicator RAPs
010-701
10/00
2-180
Initial Issue
Phaser 790/DocuColor 2006