Table 78 Fuser Assembly Troubleshooting Procedure - Xerox 5400N - Phaser B/W Laser Printer Service Quick Reference Manual

RAP 49 Fuser Assembly
Warning: If the printer has been switched on, the fuser may be very
hot.
Table 78 Fuser Assembly Troubleshooting Procedure
Step Actions and Questions
1 RESISTANCE MEASUREMENTS
1. Switch printer power OFF.
2. Remove the Fuser Assembly [RRP 5.1,
3. Measure the resistance between pins A1 and A2, and
between pins 1 and 4 or 2 and 4 on P174 on the Fuser
Assembly [see Figure 17 on
Does the resistance between A1 and A2 measure
between 10K and 350K ohms (depending on the
temperature of the fuser) and the resistance
between pins 1 and 4 or 2 and 4 measure less
than 5 ohms?
2 "YES" FROM STEP 1 ABOVE
1. Reinstall the Fuser Assembly.
2. Remove the Lower Rear Cover [RRP 1.7,
3. Disconnect P/J172 from the Fuser Board.
4. Ensure the Rear Cover is closed.
5. Check for continuity between P172-1 and P172-3.
Is there continuity between P172-1 and P172-3?
3 "NO" FROM STEP 2 ABOVE
1. Remove the Right Side Cover [RRP 1.2,
2. Ensure the Rear Cover is closed.
3. Check for continuity between P/J172-1 and both sides
of the Rear Cover Interlock Switch.
Is there continuity between P/J172-3 and both
sides of the Rear Cover Interlock Switch?
"YES" FROM STEP 2 ABOVE
4
1. Remove the Left Side Cover [RRP 1.1,
the Print Engine Controller Board Cover [RRP 8.5,
page 310].
2. Disconnect P/J17 from the Print Engine Controller
Board.
3. Check for continuity between P17-7 and P17-8.
Is there continuity between P17-7 and P17-8?
5 "YES" FROM STEP 4 ABOVE
1. Disconnect P/J171 from the Fuser Board.
2. Check for continuity between P17-3 and P171-1,
P17-2 and P171-2 and P17-1 and P171-3.
Is there continuity between all pins measured?
Phaser 5400 Laser Printer Service Guide
page 288].
page 134].
page 256].
page 251].
page 250] and
Yes No
Go to Replace the
Step 2. Fuser
Assembly
[RRP 5.1,
page
Go to Go to
Step 4. Step 3.
Replace the Replace the
Fuser Rear Cover
Harness Interlock
Assembly Switch
[PL 9.2, [PL 9.2,
page 406]. page
the Fuser
Wiring
Harness
[PL 9.2,
page
necessary.
Go to Replace the
Step 5. Fuser
Harness
Assembly
[PL 9.2,
page
Go to Replace the
Step 6. Fuser
Harness
Assembly
[PL 9.2,
page
288].
406] or
406] as
406].
406].
133