TROUBLE, SYMPTOM AND CONDITION
PROBABLE CAUSE
TEST, CHECK, AND/OR REMEDY
OUTPUT VOLTAGE NOT PROPER LEVEL
1. Poor voltage regulation.
Step 1. Loose connection of voltage sensing lead.
Check connection at output contactor and control circuit
board. Tighten connection as necessary.
2. Output voltage too high (above 32 Volts).
Step 1. Voltage calibration off.
Attempt calibration per Section 3-3. If calibration isn’t
possible, replace PC control board.
Step 2. Voltage sensing lead open.
Repair or replace voltage sensing lead.
3. Unstable voltage.
Step 1. Open filter capacitor.
Find and replace defective capacitor.
Step 2. One or more SCRs not firing properly.
Adjust balance control or replace defective SCR heat
sink assembly if oscilloscope shows faulty SCR devices.
Replace PC control board if oscilloscope shows no gate
pulse and the PC control board inputs and controls are
proper except for output.
Electrical Troubleshooting Chart
Figure 1 (Sheet 7 of 7 Sheets)
OM-2010
3-4 April 10/89 Revised
Page 10
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