Fusion F300S, F300SQ manual 73

Table 18. Troubleshooting/Fault Diagnosis (continued)

	Signal/
Operation	Other	Possible Cause	Corrective Action
	Symptoms
		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
Switch from	LAMP OUT		inspect the bulb for normal mercury
			condensation. If normal mercury
STANDBY to	indicator lights
			condensation is not observed, (if all the
ON	after 8
			pellets are at one end, or at the center of
	seconds;
			the bulb), if possible, test the bulb in a
	Lamp bulb
			separate unit. If the bulb starts, check your
	does not light
			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.

Installation, Operation, and Maintenance Manual # 509252 Rev R 73