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R-408EW
PROCEDURE
LETTER
J
KEY UNIT 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.
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
connecter). 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. Re-install the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
TEST PROCEDURES
COMPONENT TEST
G 8
G 7
G 6
G 5
3
2
5
4
G 9
0
9
8
7
G10
FROZEN
POWER
G11
POPCORN
ENTREES
LEVEL
STOP
BAKED
G12
CLEAR
POTATOES
G13
G14
G 4
G 3
G 2
G 1
MINUTE
CHICKEN
1
PLUS
PIECES
FRESH
STEAKS
6
VEGETABLES
CHOPS
<COMPU
TIMER
REHEAT
DEFROST>
START
GROUND
CLOCK
CENTER
MEAT
FROZEN
GROUND
VEGETABLES
MEAT
Key Unit
8
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