Step 9
(from Step 8)
1. Set all circuit breaker switches in both circuit breaker panels to the Off position.
2. At the terminal strip, disconnect the cables from the terminal strip to the circuit
breaker panel for every circuit breaker position that was out of range in Step 3b.
Carefully label each pair, tape the ends to insulate the leads, and set the cables
aside.
3. Set the 15A circuit breaker switch associated with these cables to the On
position.
4. Measure for -40 to -60 V DC between the -48 V DC supply and positive ground
return connectors at the circuit breaker panel for the circuit breakers in the 15A
circuit breaker panel that were out of range.
Is the voltage between -40 and -60 V DC?
NO Go to Step 11.
YES Go to Step 10.
Step 10
1. Set all circuit breaker switches on both circuit breaker panels to the Off position.
2. Using an ohmmeter, check the terminal strip to see if it is shorted.
Is the terminal strip shorted?
NO Possible intermittent short was made at the the terminal strip. Replace
the cables and verify that the proper voltage is present.
If the proper voltage is not present, consult the service guide for the
device or drawer attached to this position.
YES Replace the terminal strip.
Chapter 5. Maintenance Analysis Procedures (MAPs) 5-25
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