Xerox 5400N - Phaser B/W Laser Printer Service Quick Reference Manual page 160

Table 77 Laser Assembly Troubleshooting Procedure (cont'd.)
Step Actions and Questions
7 "NO" FROM STEP 6 ABOVE
Measure the voltage between P/J21-3 and frame
ground.
Does the voltage P/J21-3 and frame ground
measure +5.0 VDC.
8 "NO" FROM STEP 7 ABOVE
1. Switch printer power OFF.
2. Remove the Lower Rear Cover [RRP 1.7,
3. Disconnect P/J16 from the Print Engine Controller
Board.
4. Measure the resistance between pin 5 of the
disconnected plug and P/J161-10 on the LVPS.
Is there continuity between P16-5 and
P/J161-10?
9 "YES" FROM STEP 6 ABOVE
Measure the voltage between P/J21-3 and frame
ground.
Does the voltage between P/J21-3 and frame
ground measure +5.0 VDC?
10 PRINT CARTRIDGE TAB
1. Open the Top Cover and remove the Print Cartridge.
2. Inspect the tab on the left side of the Print Cartridge
that actuates the Print Cartridge Switch.
Is the tab on the Print Cartridge intact?
11 LASER SAFETY SWITCH ACTUATOR
Press and release the Laser Safety Switch Actuator.
Does the Laser Safety Switch Actuator lever
move smoothly?
12 "YES" FROM STEP 11 ABOVE
1. Switch printer power OFF.
2. Install the Print Cartridge.
3. Leave the Top Cover open.
4. Disconnect P/J21 from the Print Engine Controller
Board.
5. Check for continuity between J21-4 and J21-3 as you
lift and lower the cartridge.
Is there continuity between J21-4 and J21-3
when you lower the cartridge and no continuity
when you lift the cartridge?
"YES" FROM STEP 5 ABOVE
13
1. Run a test print while measuring the voltage between
P/J11-5 and frame ground.
2. Run a test print while measuring the voltage between
P/J11-6 and frame ground.
Does the voltage on both pins change from
0.0 VDC to +1.1 VDC and back to 0.0 VDC?
Phaser 5400 Laser Printer Service Guide
Yes
Replace the
Print Engine
Controller
Board
[RRP 8.5,
page 310].
Replace the
LVPS
[RRP 8.6,
page 256].
page 312].
Replace the
Print Engine
Controller
Board
[RRP 8.5,
page 310].
Go to
Step 11.
Go to
Step 12.
Replace the
Print Engine
Controller
Board
[RRP 8.5,
page 310].
Go to
Step 14.
No
Go to
Step 8.
Replace the
Print Engine
Controller
Harness
[PL 9.2,
page 406].
Go to
Step 10.
Replace the
Print
Cartridge
[PL 8.1,
page 402].
Replace the
CRUM PWB
[RRP 3.7,
page 281].
Replace the
CRUM PWB
[RRP 3.7,
page 281].
Replace the
Print Engine
Controller
Board
[RRP 8.5,
page 310].
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