Samsung CE745GR service manual Troubleshooting

Page 16

Troubleshooting

6-1 Electrical Malfunction(continued)

SYMPTOM		CAUSE	CORRECTIONS

Oven lamp and fan motor turn on	1.	Misadjustment or loose wiring	Adjust door and latch switches.
		of primary latch switch
	2.	Defective primary latch switch

Oven can program but timer	1.	Open or loose wiring of secondary	Adjust door and interlock switches.
does not start.		interlock switch
	2.	Off-alignment of primary interlock
	3.	Defective secondary interlock S/W

Microwave output is low;.	1.	Decrease in power source voltage.	Consult electrician.
Oven takes longer time to	2.	Open or loose wiring of magnetron
cook food.		filament circuit. (Intermittent oscillation))
	3.	Aging of magnetron

Fan motor turns on when plugged in	Loose wiring of door sensing switch		Check wire of door sensing switch.

Oven does not operate and return	Defective Ass'y PCB		Replace PCB main.
to the plugged in mode.

Loud buzzing noise can be heard.	1.	Loose fan and fan motor	Tighten screws of fan motor.
	2.	Loose screws on H.V.Transformer	Tighten screws of H.V.Transformer.
	3.	Shorted H.V.Diode	Replace H.V.Diode.

Turntable motor does not rotate.	1.	Open or loose wiring of turntable motor.	Check the wire of turntable motor
	2.	Defective turntable motor.	Replace turntable motor.

Oven stops operation during cooking	1.	Open or loose wiring of primary	Adjust door and latch switches.
		interlock switch
	2.	Operation of thermal cutout(Magnetron)

Sparks	1.	Metallic ware or cooking dishes	Inform the customer.
		touching on the oven wall.
	2.	Ceramic ware trimmed with gold or	Do not use any type of cookware with
		silver powder also causes sparks.	metallic trimming.

Uneven cooking	Uneven intensity of microwave due to		Wrap thinner parts of the food with
	its characteristics.		aluminum foil.
			Use plastic wrap or cover with a lid.
			Stir once or twice while cooking
			foods such as soup, cocoa, or milk.

Noise from the turntable motor	Noise may result from the motor.		Replace turntable motor.
when it starts to operate.

6-2	Samsung Electronics

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Contents Microwave Oven Page Precaution Safety precautionsSpecial Servicing Precautions Special High Voltage PrecautionsTable of Specifications SpecificationsComparison Chart Operating Instructions Features & External ViewsControl Panel Replacement of Magnetron, Motor Assembly and Lamp Disassembly and ReassemblyReplacement of High Voltage Transformer Replacement of Door Assembly Removal of Door AssemblyReplacement of Fuse Replacement of Drive MotorReplacement of Control Circuit Board Removal of Control Box AssemblyAlignment and Adjustments High Voltage TransformerLow Voltage Transformer MagnetronMain Relay and Power Control Relay PrecautionHigh Voltage Capacitor High Voltage DiodeOutput Power of Magnetron Leakage Measuring ProcedureMicrowave Heat Distribution Heat Evenness Troubleshooting Electrical MalfunctionTroubleshooting Exploded Views and Parts List Exploded ViewsMain Parts List Parts No Description/Specification Qty RemarksControl Parts List Body Latch Parts ListDescription/Specification Qty Parts No Description/Specification Qty Remarks Old Parts NoStandard Parts List C.B Diagrams P.C.B DiagramsP.C.B Parts List Parts No Description / Specification Qty RemarksSchematic Diagrams Schematic Diagrams