Fusion F300S, F300SQ manual 75

Table 18. Troubleshooting/Fault Diagnosis (continued)

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

Installation, Operation, and Maintenance Manual # 509252 Rev R 75