GE JGBP85 A, JGBP79 A, JGBP90 A manual Lock Motor Circuit, Door Latch Mechanism, Lock Motor Access

LOCK MOTOR CIRCUIT

5LOCK MOTOR CYCLE TEST - The lock motor cycle test allows you to run the latch assembly through one complete cycle of operation, testing motor operation and front & rear latch switch contacts. To perform this test, push and hold the SELF CLEAN key pad - make sure that the oven door is closed (light switch depressed). While depressing the SELF CLEAN pad the lock motor will run through a complete cycle. Watch the ERC display closely as it will change, based on the location of the motor and the position (open or closed) of the latch switches.

Illustrations A, B, C, and D show the sequence of events that will occur during the complete lock motor cycle, as well as what will be seen in the ERC display. Notice that the numbers shown in the left side of the display represent the position of the lock motor as well at the contact positions (open or closed) of the latch switches.

DOOR LATCH MECHANISM

The latch mechanism is thermally Controlled. When the SELF CLEAN cycle is selected and the oven sensor senses a temperature between 560°F and 650°F, the ERC supplies power to the lock motor, driving the motor towards the LOCKED position. When the lock motor reaches the LOCKED position, the micro-switches on the lock mechanism signal the control board to stop the motor, leaving it in the LOCKED position.

A

S			S
E		O	E
T		N	T
DELAY	BAKE	CLEAN	START	CLOCK	CLEAN
BROIL	LOCKED	DOOR	COOK	STOP	TIMER

B

S			S
E		O	E
T		N	T
DELAY	BAKE	CLEAN	START	CLOCK	CLEAN
BROIL	LOCKED	DOOR	COOK	STOP	TIMER

C

S			S
E		O	E
T		N	T
DELAY	BAKE	CLEAN	START	CLOCK	CLEAN
BROIL	LOCKED	DOOR	COOK	STOP	TIMER

D

S			S
E		O	E
T		N	T
DELAY	BAKE	CLEAN	START	CLOCK	CLEAN
BROIL	LOCKED	DOOR	COOK	STOP	TIMER

A

S			S
E		O	E
T		N	T
DELAY	BAKE	CLEAN	START	CLOCK	CLEAN
BROIL	LOCKED	DOOR	COOK	STOP	TIMER

UNLOCKED mode

A

Contacts

Open

Rear

Front

Contacts

Closed

UNLOCKED POSITION

Rear switch contacts open Front switch contacts closed

Moving toward LOCKED

Rear switch contacts open

Front switch contacts open

LOCKED POSITION

Rear switch contacts closed Front switch contacts open

Moving toward UNLOCKED

Rear switch contacts open Front switch contacts open

Return to UNLOCKED POSITION Rear switch contacts open

Front contacts closed

Moving toward LOCKED mode

B

Contacts

Open

Rear

Front

Contacts

Open

When the oven sensor senses a temperature of approximately 300°F. the control board once again supplies power to the lock motor, driving it towards the UNLOCKED position. When the UNLOCKED position is reached, the micro-switches on the lock mechanism signal the control board to stop the motor, leaving it in the UNLOCKED position.

Contacts

Closed

Rear

LOCK MOTOR CYCLE

C	D
	Contacts
	Open
	Rear

LOCK MOTOR ACCESS

Remove the cooktop following the steps outlined on page 5 of this service guide - TO RAISE OR REMOVE COOKTOP.

Next remove the lock motor cover to gain access to the lock motor assembly.

Front

Contacts

Open

LOCKED mode

Front

Contacts

Open

Moving toward UNLOCKED mode

LOCK MOTOR

COVER

LOCK MOTOR

Oven Temp.

Sensor

Latch circuit shown in		2634Ω at 865o		F.
		1100Ω at 75o	F.
UNLOCKED mode
	W			W
	F2	F1
5	1			Y

FRONT		REAR
Latch Switch		Latch Switch
NC		NO
COM		COM
O	Y	S

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