Error Troubleshooting
Xerox Internal Use Only Phaser 7100 Service Manual 2-235
4. Check the connections between the Drum Motor
(K) and MCU PWB, as well as between the Drum
Motor (K) and LVPS PWB.
Are the connectors P/J472, P/J4723, P/J4724,
P/J524, P/J5246, and P/J5243 connected
securely?
Go to step 5. Re-connect the
connectors P/J472,
P/J4723, P/J4724,
P/J524, P/J5246, and
P/J5243.
5. Check the conductivity between the Drum Motor
(K) and Relay Connector.
Are the connections between P/J4724 <=>
P/J4723 and between P/J5243 <=> P/J5246
conducting properly?
Go to step 6. Replace the PR
Harness Assembly (K).
6. Check the conductivity between the Relay
Connector and LVPS PWB.
Is the connection between P/J5246 <=> P/J524
conducting properly?
Go to step 7. Replace the Main
Harness Assembly.
7. Check the conductivity between the Relay
Connector and MCU PWB.
Is the connection between P/J4723 <=> P/J472
conducting properly?
Go to step 8. Replace the Main
Harness Assembly.
8. Check the voltage supply (+3.3VDC) to the Drum
Motor (K).
Measure the voltage between the MCU PWB
GND <=> P/J472-16.
Is there a voltage (approx. +3.3VDC) output?
Go to step 9. Refer to +3.3VDC
Power Troubleshooting
on page 2-458.
9. Check the voltage supply (+24VDC) to the Drum
Motor K.
Measure the voltage between LVPS PWB GND
<=> P/J524-5.
Is there a voltage (approx. +24VDC) output?
Close the Interlock Switch and check.
Replace the Drum
Motor (K)
(REP 11.8 PR Drive
Assembly (K) on
page 4-200).
Replace the LVPS PWB
(REP 12.7 LVPS PWB
on page 4-211).
Troubleshooting Procedure (Continued)
Step Actions and Questions Yes No
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