Keypanel, Transformer, Interlock Switches, Monitor Switch - GE SpaceMakerXL JMV1420 Technical Service Manual

KEY PANEL
The key panel has I ribbon connector on smart board.
If necessary, the key panel pads can be checked by a
continuity test.
For ease of handling, the key panel or control should be
removed and placed on a flat surface.
Part of the ribbon connections are on one side and the
remainder on the other side. Pad operation can be
checked between connections at end of ribbon (use high
Ohms scale). Use mini-manual to identify connectors.
To Replace Key Panel:
• Separate smart board and control trim/key panel asm.
• Replace with new control trim/key panel asm.
CONTROL TRANSFORMER
The control transformer is mounted on the smartboard.
TO SERVICE:
• Lower control panel and unplug leads to smart board.
• Remove smartboard and replace.
DOOR SENSING AND PRIMARY INTERLOCK
SWITCHES
The primary interlock switch is mounted to the plastic
switch bracket on the bottom, the monitor is in the
middle and the door sensing switch is mounted to the
upper portion of the plastic switch bracket.
The power relay is mounted on the smart board.
They are activated by the latch heads on the door. When
the door is opened, the switches interrupt the circuit to
all components, except the oven lamp. A cook cycle
cannot take place until the door is firmly closed thereby
activating both interlock switches. The primary interlock
system consists of the door sensing switch, primary interlock
switch and power relay.
MONITOR SWITCH
The monitor switch is operated (the contacts opened)
indirectly by the bottom latch pawl. The pawl operates a
cam switch, which in turn, actuates the monitor switch.
The switch is intended to render the oven inoperative by
means of blowing the monitor fuse when the contacts of
the primary interlock switch and power relay fail to open
when the door is opened.
Functions:
I . When the door is opened, the monitor switch contact
closes (to the ON condition). At this time the primary
interlock switch and power relay are in the OFF
condition (contacts open).
2. As the door goes to a closed position, the monitor
switch contacts are first opened and then the door sensing
switch and the primary interlock switch
contacts close. (On opening the door, each of these
switches operate inversely.)
EXHAUST
FAN MOTOR
DOOR SENSING SWITCH
*DOOR CLOSED 0 Ω
*DOOR OPEN
MONITOR SENSING SWITCH
*DOOR CLOSED
*DOOR OPEN 0 Ω
PRIMARY SWITCH
NOTE: REMOVE WIRES TO CHECK
CONTINUITY
16
REMOVE SCREW
TO LOWER
CONTROL
PANEL
Ω
Ω
*DOOR CLOSED 0 Ω
Ω
*DOOR OPEN