GE GFDS350 Technical Service Manual

Also see for GFDN240: Owner's manual Owner's manual Owner's manual Owner's manual

GE GFDS350 Technical Service Manual Manual pdf 31 page image

– 31 –Door SwitchDoor SwitchThe door switch is fastened to the front panel by 2locking tabs (1 on each side). When the dryer dooris closed, the switch will complete the drum motorcircuit, allowing dryer operation. When the door isopen, the switch will open the drum motor circuit,interrupting dryer operation. Opening the dryer doorwill also cause the door switch to close the drumlight circuit, allowing the drum light to be energized.Locking TabsDoor Switch Front ViewDoor Switch Rear ViewNote: The 2 sensor rods in the air duct assembly arereplaceable individually. To replace the sensor rods,order part WE1M575.• The sensor rods are connected to themain control board. The rods are spacedapproximately 1/2-in. apart, which creates anopen circuit to the control.• The control board utilizes a low-voltagecapacitor that charges to approximately 5 VDCwhen the circuit is open and discharges to lessthan 1 VDC when the circuit is shorted.• When wet clothes tumble across the tworods, the clothes create a very low resistancebetween the rods, which discharges thecapacitor.• As the clothes become dry, their resistancevalue increases and the charge across thecapacitor builds to approximately 5 VDC.• Proper leveling of the dryer is vital for accuratesensor drying. If the front of the dryer is raisedtoo high, clothes will tumble toward the rear ofthe drum, preventing contact with the sensorrods. This could produce a false dryness reading.The dryer will signal when the clothes are at 17%moisture level if equipped with a damp signal thathas been selected.Approximate values for dryness level:Damp = 17%Less dry = 12%Dry = 2-6%More dry = <2%Operation of the moisture sensor can be checked byusing service test mode T07. (See Service Test Mode.)Moisture SensorThe moisture-sensing circuit consists of 2 sensorrods. They are mounted beneath the lint filter on thedrum side of the air duct.