Mitsubishi Electric HP120TNU-A Service Handbook page 303

[8-11 Control Circuit ]
Check for conductivity between TB12 and pin 3 of
CN12 and between TB11 and pin 1 of CN12.
Check the wiring between the noise filter board and
TB1 of power supply terminal block for proper
connections.
Check the voltage across L1 and L2 of power supply
terminal block TB1.
62
- chapter 8
A
NO
Is there conductivity between them?
YES
YES
Any problems with wiring or
loose connectors?
NO
YES
187-253 VAC
NO
Check TB11-TB23 on the noise filter for loose
screws.
NO
Any loose
Replace the noise filter
screws?
YES
Tighten loose screws.
Correct wiring problems, and tighten loose connectors.
Replace the power-supply board.
Check the power-supply wiring and the main
power supply, and correct any problems found.
B
Turn the power
supply back on.
HWE18220_GB