30 Check J4-1 at the AC power supply unit for continuity to ground.

Is there continuity?

No: Continue.

Yes: Replace the AC power supply unit, then turn to TAG 002: Check & Problem Resolution.

31 Check P4-7 for continuity to ground.

Is there continuity?

No: Go to #33 in this TAG.

Yes: Continue.

32 Disconnect J/P6.

•Check P4-7 to P6-1 for continuity to ground.

Is there continuity?

No: Replace the DC power supply unit, then turn to TAG 002: Check & Problem Resolution.

Yes: Repair or replace the connectors or wiring from P4-7 to P6-1, then turn to TAG 002: Check & Problem Resolution.

33 Check J4-7 at the AC power supply unit for continuity to ground.

Is there continuity?

No: The customer’s circuit breaker may be defective. Verify that the wall outlet has the proper voltage. If it does, continue; otherwise, turn to TAG 002: Check & Problem Resolution.

Yes: Replace the AC power supply unit, then turn to TAG 002: Check & Problem Resolution.

34 Disconnect J/P84.

•Check P4-5 to P84-1 and P4-6 to P84-2 for continuity.

Is there continuity on both?

No: Repair or replace the connectors or wiring that lack continuity, then turn to TAG 002: Check & Problem Resolution.

Yes: Continue.

35 Check J84-1 to P131 and J84-2 to P132 for continuity.

Is there continuity on both?

No: Repair or replace the connectors or wiring that lack continuity, then turn to TAG 002: Check & Problem Resolution.

Yes: Continue.

36 Check J131 to J132 (top interlock switch) for continuity while activating the top cover interlock switch.

Is there continuity?

No: Repair or replace the top cover interlock switch, then turn to TAG 002: Check & Problem Resolution.

Yes: You have failed to isolate the problem. Return to the beginning of this TAG.

3-124

Troubleshooting Analysis Guide (TAGs)