Xerox 4400DT - Phaser B/W Laser Printer Service Manual page 116

Fuser Assembly Troubleshooting Procedure (cont'd.)
Step Actions and Questions
2 Measure the resistance between pins 3 and 4 of P272.
Is the resistance less than 5 ohms?
3 1. Remove the Fuser Heat Rod (RRP 6.9 on
page 6-77).
2. Measure the resistance of the Heat Rod.
Is the resistance less than 5 ohms?
4 1. Reinstall the Fuser Assembly.
2. Remove the Left Interface Cover (RRP 1.1 on
page 6-6), Left Cover (RRP 1.2 on
Left Plate (RRP 1.11 on
3. Disconnect P/J11 from the LVPS PWB.
4. Check the resistance between P11 pin 1 and pin 2.
Is there less than 5 ohms resistance?
5 1. Reconnect P/J11 and disconnect P/J27 from the
Engine Logic Board.
2. Measure the resistance between P/J27 pins 1 and 2.
Is the resistance between 7K and 380K ohms
(depending on the temperature of the fuser)?
6 1. Reconnect P/J27.
2. Measure the voltage on the LVPS between P/J281
pin 12 and frame ground as you switch the printer
power ON.
Is the voltage 0.0 VDC during fuser warm-up,
then does it change to 2.8 VDC?
Phaser 4400 Laser Printer Service Manual
page 6-7), and the
page 6-16).
Yes No
Go to step 4. Go to step 3.
Replace the Replace the
Fuser Top Heat Rod
Cover (RRP (RRP 6.9 on
6.9 on page
page 6-77).
Go to step 5. Repair or
replace the
Fuser
Harness
Assembly
(RRP 6.3 on
page
Go to step 6. Repair or
replace the
Fuser
Harness
Assembly
(RRP 6.3 on
page
Replace the Replace the
LVPS (RRP Engine Logic
9.5 on Board (RRP
page 6-91). 9.3 on
page
6-77).
6-67).
6-67).
6-89).
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