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R -508DK
R -510DK
R-510DW
b) When touching a number pad, two figures or more are displayed.
c) When touching the pads, sometimes a pad produces no signal.
If the Key unit is defective.
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) Replace the Key unit.
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.
2. Control Unit
The following symptoms indicate a defective control unit. Before replacing the control unit, perform
the Key unit test (Procedure J) to determine if control unit is faulty.
2-1 In connection with pads.
a) When touching the pads, a certain group of pads do not produce a signal.
b) When touching the pads, no pads produce a signal.
2-2 In connection with indicators
a) At a certain digit, all or some segments do not light up.
b) At a certain digit, brightness is low.
c) Only one indicator does not light.
d) The corresponding segments of all digits do not light up; or they continue to light up.
e) Wrong figure appears.
f) A certain group of indicators do not light up.
g) The figure of all digits flicker.
2-3 Other possible problems caused by defective control unit.
a) Buzzer does not sound or continues to sound.
b) Clock does not operate properly.
c) Cooking is not possible.
When testing is completed,
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) Reconnect all leads removed from components during testing.
5) Re-install the outer case (cabinet).
6) Reconnect the power supply cord after the outer case is installed.
7) Run the oven and check all functions.
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
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
5
4
3
2
1
0
9
8
7
6
START
BEVERAGE
POPCORN
CASSEROLE
POWER
LEVEL
COMPU
DEFROST
MINUTE
PLUS
ROLLS &
MUFFINS
DINNER
PLATE
FROZEN
ENTREES
BAKED
POTATOES
STOP
CLEAR
TIMER
CLOCK
FRESH
VEGETABLES
FROZEN
VEGETABLES
G 8
G 9
G10
G11
G12
G13
G14
G 7
G 6
G 5
G 4
G 3
G 2
G 1
R-508DK
