Xerox 5400N - Phaser B/W Laser Printer Service Quick Reference Manual page 159

RAP 48 Laser Assembly
Table 77 Laser Assembly Troubleshooting Procedure
Step Actions and Questions
LASER SCANNER MOTOR
1
1. Enter Diagnostics mode.
2. From the Main Menu, select Component Test / ROS
Motor / press [4] to start, [0] to stop.
Do you hear the Laser Scanner motor spin up?
"NO" FROM STEP 1 ABOVE
2
1. Switch printer power OFF.
2. Remove the Left Side Cover [RRP 1.1,
3. Switch printer power ON.
4. Measure the voltage between P/J11-11 on the Print
Engine Controller Board and frame ground.
Does the voltage between P/J11-11 and frame
ground measure +24.0 VDC?
3 "NO" FROM STEP 2 ABOVE
Measure the voltage between P/J16-9 on the Print
Engine Controller Board and frame ground.
Does the voltage between P/J16-9 on the Print
Engine Controller Board and frame ground
measure +24.0 VDC?
4 "YES" FROM STEP 2 ABOVE
1. Enter Diagnostics mode.
2. From the Main Menu, select Component Test / ROS
Motor.
3. Measure the voltage between P/J11-13 and frame
ground.
4. Press [4] and observe the voltmeter.
Does the voltage drop from +5.8 VDC to 0.6
VDC?
5 "YES" FROM STEP 1 ABOVE
1. Switch printer power OFF.
2. Remove the Left Side Cover [RRP 1.1,
3. Remove the Print Engine Controller Board Cover
[RRP 8.5,
4. Switch printer power ON.
5. Measure the voltage between P11-8 and frame
ground.
Does the voltage between P11 and frame ground
measure +5.0 VDC?
6 "NO" FROM STEP 6 ABOVE
Measure the voltage between P/J21-4 and frame
ground.
Does the voltage between P/J21-4 and frame
ground measure +5.0 VDC?
130
.
page 310].
Yes
Go to
Step 5.
Go to
Step 4.
page 250].
Replace the
Print Engine
Controller
Board
[RRP 8.5,
page
Replace the
Laser
Assembly
[RRP 7.1,
page
Go to
Step 13.
page 250].
Go to
Step 9.
Phaser 5400 Laser Printer Service Guide
No
Go to
Step 2.
Go to
Step 3.
Replace the
LVPS
[RRP 8.6,
page 312].
310].
Replace the
Print Engine
Controller
Board
297]. [RRP 8.5,
page 310].
Go to
Step 6.
Go to
Step 7.