Motorized Door Lock Circuit Information - GE C2S985 Technical Service Manual

Motorized Door Lock Circuit Information

There are two circuits that control the door lock.
These are the lock motor circuit and the lock switch
circuit.
The lock motor circuit applies voltage (120 VAC)
to the lock motor. This circuit is from L1 thru the
door switch, lock relay, and lock motor to neutral.
For this circuit to be complete, the lock relay must
be energized by the control and the door must be
closed. An open oven door results in LOCK DOOR
fl ashing in the display after the control has been
programmed for the clean cycle and START has
been pressed.
The lock switch circuit tells the control if the lock
motor is in the unlocked or locked position or
somewhere in between. There are two lock switches
mounted to and operated by the lock motor.
The lock switch circuit runs from the control, thru 1
of the lock switches (switch 2 for unlocked or switch
1 for locked), and back to the control. If neither
switch is closed, and the oven temperature is below
715°F (379°C) for double ovens or 770°F (410°C) for
single ovens, the control will energize the lock motor
circuit until the correct switch closes to complete
the circuit. If the circuit to the correct switch is
open, the lock motor will run continuously with the
oven below 715°F (379°C) for double ovens or 770°F
(410°C) for single ovens.
Clean Cycle and Lock Sequence
1. Program the clean cycle:
• Press the SELF CLEAN pad. Four hours (4:00)
appears on the time display. (Cleaning time can
be changed from the 4-hour starting point by
pressing the SELF CLEAN pad a second time.)
• After START has been pressed, ON illuminates to
indicate the cycle has begun.
2. Locking the door:
• After programming the clean cycle and pressing
the START pad, the control energizes the lock
relay. Voltage (120 VAC) is applied to the lock
motor circuit. The oven door must be closed
before the lock motor can run. LOCK DOOR will
fl ash and the control will beep until the door is
closed.
• The lock motor turns a cam mounted to the
motor shaft.
• LOCKED DOOR fl ashes on and off in the display
while the lock motor is in motion.
• As the cam revolves about 1/2 rotation
(approximately 12 seconds), it moves the lock
hook into a corresponding slot in the oven door
to secure it.
• The movement of the cam closes lock switch 1,
which tells the control the door is locked. The
control then removes power from the lock motor
circuit by de-energizing the lock relay.
• The lock motor stops and lock switch 1 is held
closed by the cam thru the clean cycle.
• LOCKED DOOR stops fl ashing and remains
illuminated in the display.
• ON illuminates in the display.
3. During the clean cycle:
• The broil relay closes and the broil burner begins
to heat. The broil burner operates alone during
the fi rst 30 minutes of the clean cycle, followed
by the bake burner alone during the remaining
time.
• As the clean cycle progresses and the
temperature of the oven control area rises, the
cooling fans are activated.
• A normally closed thermal switch is mounted
on a bracket in front of the cooling fan. This
switch is in the lock switch circuit and opens
the lock switch circuit in the event of an over-
temperature condition in the control area
(caused by a stalled fan, fan switch failure,
or similar condition). An F2 (overtemperature)
failure code will appear on the control if this
switch opens while the oven is above 715°F
(379°C) for double ovens or 770°F (410°C) for
single ovens. With the oven between 400°F
(204°C) to 600°F (315°C), the clean cycle will
be canceled by the opening of the switch and
the control will revert back to the time-of-day
mode. Below 400°F (204°C), the lock motor will
revolve continuously, and the words LOCKED
DOOR will fl ash on the control until the circuit is
established.
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