Frigidaire CGMV173KB Servicing page 31

Procedure
Letter
M
KEY UNIT (MEMBRANE SWITCH) TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor. (See Warnings and Instructions on page 3-1)
4. If the display fails to clear when the Stop/Clear pad is depressed, first verify the flat ribbon cable
is making good contact, verify that the door sensing switch (stop switch) operates properly;
that is the contacts are closed when the door is closed and open when the door is open. If the
door sensing switch (stop switch) is good, disconnect the flat ribbon cable that connects the key
unit to the control unit and make sure the door sensing switch is closed (either close the door
or short the door sensing switch connector). Use the Key unit matrix indicated on the control
panel schematic and place a jumper wire between the pins that correspond to the Stop/Clear
pad making momentary contact. If the control unit responds by clearing with a beep the key
unit is faulty and must be replaced. If the control unit does not respond, it is faulty and must be
replaced. If a specific pad does not respond, the above method may be used (after clearing the
control unit) to determine if the control unit or key pad is at fault.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
60 G 4
G 3
61
62 G 2
1 G 1
51
G 13
59 58 57
G 5 G 6 G 7
user auto auto
vegetables
pref cook defrost
sensor snack
turn table
reheat menu
on-off
timer sensor chicken
On-off cook nuggets
Section 3 Troubleshooting and Testing
Component Test
56 55 54
G 8 G 9 G 10
3 6
baked
2 5
potato
pop
1 4
corn
53 52
G 11 G 12
S TOP
9
clear
power
level
8 0
S TART
7
enter
+30 sec
KE Y UNIT
3-11