Sharp R-230BK Service Manual page 9

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.
L COMPU 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 " COMPU DEFROST " pad once and touch the Number pad "5". And then touch
the "START" pad.
(3) The oven is in Compu Defrost cooking condition.
(4) The oven will operate as follows.
WEIGHT
0.5lb
(5) If improper operation is indicated, the control unit is probably defective and should be checked.
TEST PROCEDURES (CONT'D)
COMPONENT TEST
G 7
G 8
G 9
G10
1ST STAGE
LEVEL TIME LEVEL
50% 1min.25sec. 30%
7
G 6 G 5 G 4
2
6
BEVERAGE
FRESH
3
5
VEGETABLES
ROLL, TIMER
0
MUFFIN
CLOCK
9 8
2ND STAGE 3RD STAGE
TIME LEVEL
1min.40sec. 10%
R-230BK
R-230BW
G 3 G 2 G 1
DINNER COMPU
PLATE DEFROST
POWER
4
LEVEL
STOP
BAKED
1
POTATO
CLEAR
START
7
POPCORN
MINUTE PLUS
TIME
1min.2sec.