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Installation, Operation, and Maintenance Manual # 509252 Rev R 75
Switch from
STANDBY to
ON (continued)
LAMP OUT
indicator lights
after 8
seconds;
Lamp Bulb
does not light
(continued)
Dirty surface Inspect lamp bulb and reflector. Clean or
replace as necessary. Try to start again.
Line voltages out of
specification
NOTE: If the magnetron needs to be
replaced prematurely, check that the
single-phase voltage is within specification
(see “Basic Checks” on page 65).
Weak magnetron If photoresistor reading does not fall to
below 9.3 VDC in 8 seconds, a weak
magnetron is commonly indicated.
LAMP OUT
indicator lights
after 8
seconds;
UV bulb
reaches full
intensity
Photoresistor Measure photoresistor output at Photocell
Voltage Test Points while switching to ON
(see schematic) +12 VDC at STANDBY,
2-5.5 VDC at ON. If voltages are incorrect,
remove the irradiator cover and replace the
photoresistor as described in Chapter 6,
“Maintenance”.
Weak magnetron If photoresistor reading does not fall to
below 9.3 VDC in 8 seconds, a weak
magnetron is commonly indicated.
Connections Disconnect all power. Remove the power
supply cover. Reseat the control card
connectors P6 and P10. Restart.
Control card Replace the control card.
Table 18. Troubleshooting/Fault Diagnosis (continued)
Operation
Signal/
Other
Symptoms
Possible Cause Corrective Action