Service
5-2
6600-0361-000
08/10/02
5-2
Troubleshooting
Symptom
Possible Problem
Solution
Bulb does not light after
Bulb is too hot for unit to switch on
Allow bulb to cool for about 10 seconds and
switching unit off and
reapply power. If left on fan will continue to
back on. Over temp
operate and assist in cooling the bulb.
light doesn’t light.
Power light is lit.
Bulb doesn’t light
Bad connection
Check line voltage circuitry to power supply.
Over temp light
Bad power switch
Trace line voltage from line filter through circuit
doesn’t light. Power
Bad circuit breaker
breakers and power switch to power supply.
light doesn’t light.
Bad line filter
If line voltage is present going into any of these
devices but not present on the output of the
device, then replace that device.
Bad power supply
If line voltage is present at power supply, verify
power supply output. 12 volts should be present
at J2 pins 1 referenced to pin 4. If there is no
output, replace power supply.
Bulb doesn’t light.
Bad bulb
Replace bulb.
Over temp light doesn’t
Bad ballast
Replace ballast*.
light. Power light is lit,
or
Arcing sound heard but
bulb does not light
Bulb doesn’t light or goes
Dirty filter
Unit is in overheat mode. Check fan inlet filter. out
every few minutes.
Clean or replace filter if dirty.
Over temp light is lit
Bad main or ballast fan
Verify that both fans are running
or goes out when bulb lights
Bad thermostat
Thermostat can be tested with an ohm meter. In
Power light is lit.
normal operation the thermostat should be
closed.
Bulb lights but Power light
Bad indicator board
Replace indicator board.
doesn’t light. Over temp
light doesn’t light.
Low light output
Lens blocked.
Clean lens.
Bad bulb.
Replace bulb.
Bad ballast
Replace ballast*.
Hour meter doesn’t display
Bad hour meter
Verify that 12 volts is present on J3 pins 2
hours. Power light is lit.
referenced to pin 4. If voltage is present replace
hour meter.
Hour meter doesn’t count
Bad indicator board
Verify that >11 volts is present on J3 pins 1
hours when bulb is on.
Bad hour meter
referenced to 4. If voltage is present replace Power
light is lit.
Bad ballast
hour meter. If voltage is less than 11 volts verify
that voltage at J1 pin 4 referenced to pin 5 is
>1.421 volts. If voltage is present replace
indicator board. If voltage is not present,
replace ballast*.
*Due to the dangerous high voltage pulses and internal testing circuitry in the ballast, testing of the output is not recommended. Replac-
ing the bulb with a known good bulb is recommended to determine if the problem is with the bulb or the ballast.
