6CP30/15-3
6-1
SECTION 6: TROUBLESHOOTING
General
If the controls do not operate properly after having been used according to the instructions, the following
should be checked.
Check main facility input power to the test set.
Check indicating lamps. (Spare lamps are available through Phenix Technologies.)
Check operation of the circuit breaker (CB1). Control Power lamp should be on when the circuit breaker is
on.
Check fuses.
Check all plug connections on the test set, internal and external.
Specific Problems
1. High voltage cannot be turned on?
- External interlock is open.
- Raise Voltage dial is not in lower limit position.
- Protection circuit (Overcurrent) is not reset.
- Faulty relay contacts.
- Faulty HV On switch.
- Faulty Reset Switch.
2. Voltage control inoperable?
- High voltage is not on (K3 not energized or see number 1 above).
- Faulty variable auto-transformer, T1.
- Faulty high voltage transformer.
3. Overcurrent inoperable?
- Improper sensitivity (adjust Overcurrent Trip, R1, on front panel).
- Defective U101 or SCR101 on PCB 1257.
- Check the unregulated +22 volts DC and the +15 volts DC regulator output at TP5.
- Check signal input voltage to PCB 1257 at Connector 4-4.
- Check overcurrent lamp on the panel and relay K101 on PCB 1257.
4. Currentmeter inoperable?
- Connections between the test set and the test specimen are open
- No output from the ±15VDC power supply on PCB 1257.
- Current meter range switch (SW5) between detents.
- Meter defective.
- No +5VDC power to the meter from PCB 1257.
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