TAG 600: AC Power Malfunction
June 1999 Troubleshooting Analysis Guide (TAGs) 3-123
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.
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