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Installation, Operation, and Maintenance Manual # 509252 Rev R 73
Switch from
STANDBY to
ON
LAMP OUT
indicator lights
after 8
seconds;
Lamp bulb
does not light
High Voltage Cable Check cable connections at J103, J104,
J10, and J11.
Lamp Bulb Measure the Photoresistor output at the
photocell test points and magnetron
current test points on the front panel while
switching to LAMP ON.
If the photocell voltage does not drop when
the magnetron current voltage changes,
replace the bulb.
If the photocell voltage drops, remove and
inspect the bulb for normal mercury
condensation. If normal mercury
condensation is not observed, (if all the
pellets are at one end, or at the center of
the bulb), if possible, test the bulb in a
separate unit. If the bulb starts, check your
process (air handling, duty cycle, etc.). If
the bulb does not start, replace the bulb.
New bulb During its first start, a new lamp bulb may
take up to 8 seconds after ignition before
reaching full intensity if the mercury (Hg) fill
has accumulated at one end or at the
center of the tube.
High Voltage cable Check cable connections at J103, J104,
J10, and J11.
Control Listen for the sound of K101, the high
voltage contactor, inside the power supply.
It should be heard closing with an audible
click when switched ON (after a three
second wait in STANDBY). If not detected:
Disconnect single-phase power. Reseat
control board assembly connectors P8 and
P9. Observe K1 and K102 when switching
to STANDBY. Reconnect the single-phase
power and observe K2 and K101 when
switching to ON.
K1, K2 Relays Replace K1 and K2 on the control board
assembly.
Control card Replace control card.
Table 18. Troubleshooting/Fault Diagnosis (continued)
Operation
Signal/
Other
Symptoms
Possible Cause Corrective Action