Fusion F300S, F300SQ manual 76

Table 18. Troubleshooting/Fault Diagnosis (continued)

	Signal/
Operation	Other	Possible Cause	Corrective Action
	Symptoms
	PWR IMBAL	Power Supply	Usually, a diode or capacitor failure will
	indicator lights		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	Check the filament transformer and
		Transformer	connections.
Switch from		Control Card	Replace the control card if no power
			supply, magnetron, or other malfunctions
STANDBY to			are found.
ON
		Failing (Moding)	Check magnetron current at front panel
(continued)
		Magnetron	test points. If it is not within specifications,
			replace magnetron.
	PWR ERROR	Filament	Check filament transformer and
	indicator lights	transformer	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	Lamp bulb faulty	Replace the lamp bulb.
	indicator lights
		RF Screen	Replace the RF screen.
		damaged
		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.

76F300S/F300SQ Ultraviolet Lamp System