7-1
SECTION 7: TROUBLESHOOTING
General
If the controls do not operate properly after having been used according to the instructions, the following hints
may help.
Check main facility input power to the test set.
Check indicating lamps. (Spare lamps are available through Phenix Technologies.)
Check fuse-F1.
Check all external plug connections on the test set.
Specific Problems, Refer to appropriate electrical diagrams.
1. High Voltage cannot be turned on?
Voltage Control dial is not in Zero Start position.
External interlock circuit open.
Current Trip setting too low, or needs reset.
Current trip circuit damaged, won’t reset, try replacing U101 (LM311N)
Faulty HV On switch, faulty HV Off switch.
Relay K1 dislodged or faulty.
2. Voltage control inoperable?
Tripped or faulty Thermal Overload.
High voltage is not on (see number 1 above).
Faulty Variable transformer "T1".
Faulty High Voltage tank assembly.
3. Over current inoperable?
Faulty U101 (LM311N).
Faulty DC Power Supply circuit.
Defective over current relay K101.
Faulty R7 over current trip potentiometer.
4. Currentmeter inoperable?
Improper connection of GUARD/GND/RETURN jumper (J1) for mode of operation.
Improper connection of test specimen.
Faulty U201 or U202 (LM348).
Meter damaged.
Faulty currentmeter range switch SW5.
Faulty connection in currentmeter circuit.
Faulty DC Power Supply Circuit.
5. Voltmeter inoperable?
Meter damaged.
No high voltage present at output.
Faulty connection in voltmeter circuit.
6. No output voltage from high voltage section?
Defective metering circuit.
No input to voltage regulator section, possible problems with K1 relay or Thermal Overload.
High Voltage Cable shorted to shield of cable.
Faulty High Voltage Unit.
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