Sharp R-340DK Service Manual page 19

PROCEDURE
LETTER
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.
K RELAY 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. Disconnect the leads to the primary of the power transformer.
5. Ensure that these leads remain isolated from other components and oven chassis by using insulation
tape.
6. After that procedure, re-connect the power supply cord.
7. Remove the outer case and check voltage between Pin No. 1 of the 2 pin connector (A) and the
common terminal of the relay RY1 on the control unit with an A.C. voltmeter.
The meter should indicate 120 volts, if not check oven circuit.
RY1 and RY2 Relay Test
These relays are operated by D.C. voltage
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.
DC. voltage indicated .................... Defective relay.
DC. voltage not indicated .............. Check diode which is connected to the relay coil. If diode is good,
RELAY SYMBOL
RY1
RY2
8.Disconnect the power supply cord, and then remove outer case.
9.Open the door and block it open.
10.Discharge high voltage capacitor.
11.Reconnect all leads removed from components during testing.
12.Re-install the outer case (cabinet).
13.Reconnect the power supply cord after the outer case is installed.
14.Run the oven and check all function.
L COMPU DEFROST 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 Defrost pad and select compu Defrost. Then select Steaks/Chops/Fish.
(Now, weight 0.5lb is set.) And then touch the start pad.
(3) The oven is in Compu Defrost cooking condition.
(4) The oven will operate as follows
TEST PROCEDURES
COMPONENT TEST
control unit is defective.
OPERATIONAL VOLTAGE
Approx. 24.8V D.C.
Approx. 23.9V D.C.
17
G 1 G 2
Defrost
Set Up
G 5
3+6
Pasta Beverage
G 6
Grains Center
G13 Vegetables
Baked
Reheat
G12
Potatoes
Fish /
Poultry
G11
Seafood
G15
CONNECTED COMPONENTS
Oven lamp / Turntable motor / Cooling fan motor
Power transformer
R -340DK
R-340DW
G 3 G14
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