Error Troubleshooting
Xerox Internal Use Only Phaser 7100 Service Manual 2-455
+24VDC Power Troubleshooting
Troubleshooting Reference
Applicable Parts Wiring and Plug/Jack Map References
• MCU PWB, PL 12.1.15
• AC PWB, PL 12.1.16
• LVPS PWB, PL 12.2.1
• Main Harness Assembly, PL 12.3.1
• AC LV Harness Assembly, PL 12.3.4
• Power on page 7-38
Troubleshooting Procedure
Step Actions and Questions Yes No
1. Check the wiring harness connections between
the LVPS PWB and MCU PWB.
Are the connectors P/J528 and P/J463 connected
securely?
Go to step 2. Connect the
connectors P/J528 and
P/J463.
2. Check the conductivity between the LVPS PWB
and MCU PWB.
Is the connection between connectors P/J528
<=> P/J463 conducting properly?
Go to step 3. Replace the Main
Harness Assembly.
3. Check the voltage output (+24VDC) from the
LVPS PWB.
Measure the voltages between the LVPS PWB
GND <=> P/J528-4 and LVPS PWB GND <=>
P/J528-3.
Is there a voltage (approx. +24VDC) output?
Close the Interlock Switch and check.
Replace the MCU PWB
(REP 12.4 MCU PWB
on page 4-206).
Go to step 4.
4. Turn the power Off and On then check.
Cut Off the power supply, wait for a while, and
then restore the power supply.
Does an error occur?
Go to step 5. Troubleshooting
complete.
5. Check the AC voltage supply to the LVPS PWB.
Is the voltage between LVPS PWB P/J521-1 <=>
P/J521-3 110-240VAC?
Replace the LVPS PWB
(REP 12.7 LVPS PWB
on page 4-211).
Go to step 6.
6. Check the connection between the LVPS PWB
and AC PWB.
Are the connectors P/J521 and P/J502 connected
securely?
Go to step 7. Connect the
connectors P/J521
and P/J502.
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