TROUBLE, SYMPTOM AND CONDITION
PROBABLE CAUSE
TEST, CHECK, AND/OR REMEDY
POWER SUPPLY WILL NOT TURN OFF
1. Contactor fails to open.
Step 1. Contacts sticking in contactor.
Clean contacts or replace contactor, whichever is needed.
POWER SUPPLY ON: NO VOLTAGE OUTPUT
Step 1. Protective circuit tripped.
Determine and correct cause of trip. Then reset and
restart unit.
Step 2. Component failure in protective circuit.
Find the defective component and replace it.
Step 3. Control circuit board failure.
Check board per Section 3-3 and replace it if faulty.
Step 4. Output contactor failed or OFF.
Replace contactor, selector switch or output ON-OFF
switch, whichever of these is defective.
Electrical Troubleshooting Chart
Figure 1 (Sheet 6 of 7 Sheets)
OM-2010
April 10/89 Revised 3-4
Page 9
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