Error Troubleshooting
Phaser 7100 Service Manual Xerox Internal Use Only2-240
4. Check the connections between the Drum Motor
(Y / M / C) and MCU PWB, as well as between the
Drum Motor (Y / M / C) and LVPS PWB.
Are the connectors P/J472, P/J4721, P/J4722,
P/J524, P/J5245, and P/J5244 connected
securely?
Go to step 5. Connect the
connectors P/J472,
P/J4721, P/J4722,
P/J524, P/J5245, and
P/J5244.
5. Check the conductivity between the Drum Motor
(Y / M / C) and Relay Connector.
Are the connections between P/J4722 <=>
P/J4721 and between P/J5244 <=> P/J5245
conducting properly?
Go to step 6. Replace the PR
Harness Assembly (Y/
M/ C).
6. Check the conductivity between the Relay
Connector and LVPS PWB.
Is the connection between P/J5245 <=> 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/J4721 <=> P/J472
conducting properly?
Go to step 8. Replace the Main
Harness Assembly.
8. Check the voltage supply (+3.3VDC) to the Drum
Motor (Y / M / C).
Measure the voltage between the MCU PWB
GND <=> P/J472-8.
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 (Y / M / C).
Measure the voltage between the LVPS PWB
GND <=> P/J524-3.
Is there a voltage (approx. +24VDC) output?
Close the Interlock Switch and check.
Replace the Drum
Motor (Y / M / C) (REP
11.1 PR Drive
Assembly (Y/ M/ C) on
page 4-185).
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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