– 40 –
4. While the door is closed, check voltage between
the double wire in the harness that connects to
RY14 and the output of the Primary Interlock
Switch (brown and red wires).
• If 120 VAC is present, the Primary Interlock
Switch is operating properly.
• If 120 VAC is not present, go to step 5.
5. Check voltage between the double wire in the
harness that connects to RY14 and the input of
the Primary Interlock Switch (black and yellow
wires).
• If 120 VAC is present, the Primary Interlock
Switch is not closing. Check switch and
actuation of the switch.
• If 120 VAC is not present, go to step 6.
6. Check voltage between the double wire in the
wire harness that connects to RY14 and the
output of the Bottom TCO (yellow and black
wires).
• If 120 VAC is present, the wire between
the Bottom TCO and the Primary Interlock
Switch is open.
• If 120 VAC is not present, see
Bottom TCO
,
troubleshooting step 3.
Monitor Switch
• Location (See picture in
Door Switch Removal
section.)
• Attached to the latch bracket.
• The switch is intended to render the oven
inoperative by means of blowing either of the
20-amp fuses on Noise Filter 1. This occurs
when voltage is applied to the High Voltage
Transformer and the monitor switch is closed.
This creates a direct short between line and
neutral.
• Switch is closed when door is open and open
when door is closed.
To remove the Monitor Switch:
(See
Door Switch Removal
.)
Door Sensing Switch
• Location (See picture in
Door Switch Removal
section.)
• Attached to the latch bracket.
• Provides door status to the Smart Board.
• Switch is closed when door is closed and open
when door is open.
• When door is open, 5 VDC can be read between
pins 1 and 3 of CN07. When the door is closed,
voltage goes to 0 VDC.
To remove the door sensing switch:
(See
Door Switch Removal
.)
Primary Interlock Switch
• Location (See picture in
Door Switch Removal
section.)
• Attached to the latch bracket.
• Switches L1 to the primary of the high voltage
transformer, upper and lower heaters, Turntable
Motor, and convection fan motor.
• Switch is engaged by the latch pawls of the
oven door. The switch is closed when door is
closed and open when door is open.
To remove the Primary Interlock Switch:
(See
Door Switch Removal
.)
Troubleshooting
1. Pivot the Control Panel Assembly out from the
oven. (See
Control Panel
.)
2. To gain better access to components, remove
the wires that plug into the large relays on the
Relay Board.
(See
Relay Board
.)
Cut the wire tie
that the Smart Board CN103 wire harness (See
Smart Board
.) is routed through.
3. While the door is open, check voltage between
the double wire in the harness that connects to
RY14 and the output of the Primary Interlock
Switch (brown and red wires).
• If 120 VAC is present, replace the Primary
Interlock Switch.
• If 120 VAC is not present, go to step 4.
