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76 F300S/F300SQ Ultraviolet Lamp System
Switch from
STANDBY to
ON
(continued)
PWR IMBAL
indicator lights
Power Supply Usually, a diode or capacitor failure will
reduce magnetron current by one-half.
Test the diodes and capacitors according
to Chapter 6, “Maintenance”. The voltage
to the primary coils ONLY of the high
voltage transformers should also be
checked.
Filament
Transformer
Check the filament transformer and
connections.
Control Card Replace the control card if no power
supply, magnetron, or other malfunctions
are found.
Failing (Moding)
Magnetron
Check magnetron current at front panel
test points. If it is not within specifications,
replace magnetron.
PWR ERROR
indicator lights
Filament
transformer
Check filament transformer and
connections.
Magnetron Check for presence of magnetron current.
If it is zero, disconnect all power, and
replace magnetron. If magnetron current is
low or half, check diode block and HV
capacitors.
Control Card Replace the control card.
RF INTLK
indicator lights
Lamp bulb faulty Replace the lamp bulb.
RF Screen
damaged
Replace the RF screen.
RF - arcs forming Inspect reflector for pitting; replace if
necessary.
RF Detector faulty See “RF Detector” on page 20 to test RF
detectors.
Position Reposition the detector farther from the
screen and/or the light shield opening.
WARNING: The RF detector should at all times be closer to the screen or light shield
opening than personnel working nearby. It should be aimed so that it intercepts RF
radiation from the irradiators.
Table 18. Troubleshooting/Fault Diagnosis (continued)
Operation
Signal/
Other
Symptoms
Possible Cause Corrective Action