Sharp R-419CK, Supplemental Service Manual

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8
R - 4 1 9 C K
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
PROCEDURE
LETTER
COMPONENT TEST
Key Unit
5 4
3 2 1
0 9 8 7 6
START
BEVERAGE
POPCORN
Power
Level
MINUTE
PLUS
Fresh
Rolls/
muffins
Frozen
entrees
CUSTOM
HELP
Ground Meat
(SENSOR COOK)
Stop
Clear
Fresh
vegetables
G 8
G 9
G10
G11
G12
G13
G14
G 7 G 6 G 5 G 4 G 3 G 2 G 1
Chicken
Pieces
Steaks/
Chops
Baked
Potatoes
Frozen
Vegetables
Clock
Kitchen
Timer
Fish
Seafood
Frozen
Rolls/
muffins
Ground Meat
(COMPU DEFROST)
Reheat
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.
J KEY UNIT TEST
WARNING : The oven should be fully assembled before following procedure.
(1) Place one cup of water in the center of the turntable tray in the oven cavity.
(2) Close the door, touch the " steaks / chops " pad once.
(3) The oven is in Compu Defrost cooking condition.
(4) The oven will operate as follows
1ST STAGE 2ND STAGE
WEIGHT
LEVEL TIME LEVEL TIME
0.5lb 60% 27sec. 40% 17sec.
L COMPU DEFROST TEST
(5) If improper operation is indicated, the control unit is probably defective and should be checked.