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POWER SUPPLY TROUBLESHOOTING
Contactor does not energize (no audible "click").
1. Line safety switch open. Turn "ON."
2. Circuit breaker or fuse in AC line open. Check AC source.
3. Faulty contactor coil or loose connection at coil terminals. Repair or replace.
Contactor pulls but lamphouse igniter does not fire.
1. Faulty contactor contacts. With coil energized, check for continuity across the contacts from the
"L" side to the "T" side; repair or replace if defective.
2. Insufficient DC output. See INSTALLATION section; increase taps as required.
3. Faulty igniter.
4. Low open circuit voltage (less than 110 V.DC).
a) Check ceramic resistor R1; should be in circuit and measure 100 Ohms.
b) Check boost diodes CR7 and CR8. See preceding DIODE TESTING section.
c) Check filter capacitors C1A and C1B. Replace if defective.
5. Defective igniter printed circuit board assembly. Press STRIKE switch to override; do not hold STRIKE
switch longer thatn one second to prevent damage to high voltage transformer.
Bulb requires multiple ignition pulses to light.
1. Insufficient DC output. See INSTALLATION section; set taps as required.
2. Faulty K2 relay. Replace if defective.
3. Faulty or expired xenon bulb. Check for darkened envelope, worn electrodes; replace if re-
quired.
4. One or more faulty bridge diodes. See preceding DIODE TESTING section.
Bulb goes out during operation.
1. Excessive heat at rectifier heat sinks; thermal switch TS1 opening. Check for free air flow, blower(s)
operating at full speed. Check for loose connection.
2. Open lamphead thermal interlock switch.
Excessive flicker in light output.
1. Improper tap setting. All taps must be on same numbered or lettered step.
2. Faulty bridge diode. See preceding DIODE TESTING section.
3. Faulty xenon bulb. Check for cracked or sagging electrode(s).
4. Open filter capacitor C1A or C1B. Replace if defective.
Bridge diodes (CR1-6) fail repeatedly.
1. Insufficient air flow; defective blower. Clean, repair, or replace as required.
2. Incorrect replacement diode.
Use only the specified rated diode(s).
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