Xerox 4400DT Service Manual - Page 115
Fuser Assembly, Warning, If the printer has been switched on, the fuser may be hot.
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Page 115 highlights
Laser Assembly Troubleshooting Procedure (cont'd.) Step Actions and Questions Yes No 5 1. Switch the printer power OFF. Go to step 8. Go to step 6. 2. Remove the Left Interface Cover (RRP 1.1 on page 6-6) Left Cover (RRP 1.2 on page 6-7), and the Left Plate (RRP 1.11 on page 6-16). 3. Switch the printer power ON. 4. Check the voltage between P21 pin 6 and frame ground. Is the voltage +5.0 VDC? 6 Check the voltage between P/J28 pin 7 and frame ground. Is the voltage +5.0 VDC? Go to step 7. Replace the LVPS (RRP 9.5 on page 6-91). 7 Check the voltage between P/J25 pin 3 and frame ground. Is the voltage +5.0 VDC? Replace the Engine Logic Board (RRP 9.3 on page 6-89). Go to Print Cartridge Sensor Assembly on page 3-24. 8 Measure the voltage between P/J21 pin 9 and frame Replace the Replace the ground. Laser Engine Logic Is the voltage +5.0 VDC? Assembly Board (RRP (RRP 7.4 on 9.3 on page 6-82). page 6-89). Fuser Assembly Warning: If the printer has been switched on, the fuser may be hot. Fuser Assembly Troubleshooting Procedure Step Actions and Questions Yes No 1 1. Switch the printer power OFF. Go to step 2. Replace the 2. Remove the Fuser Assembly (RRP 6.2 on Fuser Top page 6-66). 3. Measure the resistance between pins B3 and B4 of P272 on the Fuser Assembly (refer to the figure). Cover (RRP 6.9 on page 6-77). Is the resistance between 7K and 380K ohms (depending on the temperature of the fuser)? P272 Fuser Connector (P272) 3-18 Phaser 4400 Laser Printer Service Manual
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