Xerox 4400DT Service Manual - Page 86
Fuser Failure., Fan Failure; Power Off Now., U4 Fuser Fail/Power Off
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Fuser Failure. (U4 Fuser Fail/Power Off) I Low temperature trouble/Power off (Fuser temperature drops below the set temperature after the Fuser warm-up is complete.) I Warm-up fail/Power off (Fuser warm-up does not complete within 110 seconds.) I STS Disconnection fail/Power off (Thermistor circuit is detected to be open). I High Temperature trouble/Power off (Fuser temperature rises above the set temperature.) I Continuous heat on/Power off (Heat rod is on for 10 seconds when the Main Drive Motor is stopped, after the Fuser warm-up is completed.) Fuser Failure Troubleshooting Procedure Step Actions and Questions Yes No 1 Switch the printer power OFF. Wait a few minutes, then Go to Fuser Go to step 2. switch the printer power-on. Assembly on Does the error message reappear? page 3-18. 2 Run 25 to 30 test prints. Does the error message reappear? Go to Fuser Problem Assembly on solved. page 3-18. Fan Failure; Power Off Now. (U5 Fan Fail/Power Off) The printer is detecting incorrect fan rotation. Fan Failure Troubleshooting Procedure Step Actions and Questions Yes No 1 Switch the printer power OFF, then ON. Does the Fan rotate when the main power is switched on? Go to step 4. Go to step 2. 2 1. Switch the printer power OFF. Replace the Go to step 3. 2. Remove the Left Interface Cover (RRP 1.1, Fan page 6-6), Left Cover (RRP 1.2, page 6-7), and Left Plate (RRP 1.11, page 6-16). 3. Switch the printer power-on. 4. On the LVPS, check the voltage between P/J283 pin Assembly (RRP 9.1 on page 6-87). 1 and frame ground. Is the voltage +19 ±1.9 VDC? 3 Check the voltage between P/J281 pin 13 and frame Replace the Replace the ground. LVPS (RRP Engine Logic Is the voltage +0.8 ±0.1VDC? 9.5 on Board (RRP page 6-91). 9.3 on page 6-89). Phaser 4400 Laser Printer Service Manual 2-49
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