Sharp R-310EK, Service Manual

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16
R - 310EK
R-310EW
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 " once.
(3) The oven is in Compu Defrost cooking condition.
(4) The oven will operate as follows.
MENU 1ST STAGE 2ND STAGE
Steaks/Chops LEVEL TIME LEVEL TIME
0.5lb 70% 1min.7sec. 40% 30sec.
(5) If improper operation is indicated, the control unit is probably defective and should be checked.
8. Run the oven and check all functions.
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT 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 normal
open 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, control unit is defective.
RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS
RY1 Approx. -12.2V D.C. Oven lamp / Turntable motor / Cooling fan motor
RY2 Approx. -11.1V D.C. Power transformer
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 functions.
K RELAY TEST
L COMPU DEFROST TEST
5 4
3 2 1
0 9 8 7 6
START RICE
KEEP WARM
FRESH
VEGETABLES
FROZEN
VEGETABLES
POPCORN
POWER
LEVEL
REHEAT
CENTER
MINUTE
PLUS
GROUND
MEAT
<
DEF
>
GROUND
MEAT
CHICKEN
PIECES
STEAKS
CHOPS
FROZEN
ENTREES
BAKED
POTATOES
STOP
CLEAR
TIMER
CLOCK
G 8
G 9
G10
G11
G12
G13
G14
G 7 G 6 G 5 G 4 G 3 G 2 G 1