GE JGBP86SEMSS Technical Service Manual page 21

5 LOCK 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.
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.
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.
LOCK MOTOR
COVER
Contacts
Open
Contacts
Closed
LOCK MOTOR
– 19 –
LOCK MOTOR CIRCUIT
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
Closed
LOCK MOTOR CYCLE
C
Contacts
Open
LOCKED mode
Latch circuit shown in
UNLOCKED mode
5
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
Contacts
Open
Contacts
Open
Contacts
Open
Contacts
Open
Moving toward UNLOCKED
mode
Oven Temp.
Sensor
REAR
o FRONT
1100W at 75 F.
o
Latch Switch Latch Switch
2634W at 865 F.
NC
W
W
COM
COM
F2 F1
Y Y
O
1
B
D
NO
S