Error Troubleshooting
Xerox Internal Use Only Phaser 7100 Service Manual 2-245
3. Check the voltage supply (+5VDC) to the Laser
Unit.
Measure the voltage between the LVPS PWB
GND <=> P/J525-1.
Is there a voltage (approx. +5VDC) output?
Close the Interlock Switch and check.
Go to step 4. Replace the LVPS PWB
(REP 12.7 LVPS PWB
on page 4-211)
4. Check the voltage supply (+24VDC) to the Laser
Unit.
Measure the voltage between the MCU PWB
GND <=> P/J469-3.
Is there a voltage (approx. +24VDC) output?
Close the Interlock Switch and check.
Go to step 5. Refer to +24VDC
Power Troubleshooting
on page 2-455.
5. Check the voltage supply (+3.3VDC) to the Laser
Unit.
Measure the voltage between the MCU PWB
GND <=> P/J469-8.
Is there a voltage (approx. +3.3VDC) output?
Go to step 6. Refer to +3.3VDC
Power Troubleshooting
on page 2-458.
6. Replace the Laser Unit (REP 7.1 ROS Assembly
(Laser Unit)/ Front Spring Assembly/ Right Rear
Spring Assembly/ Left Rear Spring Assembly on
page 4-130).
Does the error persist?
Replace the MCU PWB
(REP 12.4 MCU PWB
on page 4-206).
Troubleshooting
complete.
Troubleshooting Procedure (Continued)
Step Actions and Questions Yes No
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