Service manual

6
R-209EK
TEST PROCEDURES (CONT'D)
COMPONENT TEST
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
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. 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.
L EXPRESS DEFROST TEST
(1) Place one cup of water in the center of the turntable tray in the oven cavity.
(2) Close the door, touch the " EXPRESS DEFROST " pad once for 0.5lbs in weight.
(3) The oven is in Express Defrost cooking condition.
(4) The oven will operate as follows.
MENU 1ST STAGE 2ND STAGE 3RD STAGE 4TH STAGE
EXPRESS DEFROST LEVEL TIME LEVEL TIME LEVEL TIME LEVEL TIME
0.5lb 70% 57sec. 0% 57sec. 50% 32sec. 30% 45sec.
(5) If improper operation is indicated, the control unit is probably defective and should be checked.
1
2
3
45
6
7
89
0
POPCORN
START
Power
Level
Timer
Clock
MINUTE
PLUS
FRESH
VEGETABLES
EXPRESS
DEFROST
ROLLS
MUFFINS
DINNER
PLATE
BAKED
POTATOES
BEVERAGE
FROZEN
ENTREES
G 6 G 5 G 4 G 3 G 2 G 1
G 7
G 8
G 9
G10
Stop
Clear