Sharp R-1510 Service Manual page 12

R-1510
R-1511
PROCEDURE
LETTER
N RELAY TEST
1. Disconnect the power supply cord, and then remove outer case. Refer to procedure of " HOOD
EXHAUST LOUVER REMOVAL ", " REMOVAL OF OVEN FROM WALL " and " OUTER CASE
REMOVAL ".
2. Open the door and block it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
4. Remove the hood intake duct R.
5. Disconnect the leads to the primary of the power transformer.
6. Ensure that these leads remain isolated from other components and oven chassis by using insulation
tape.
7. After that procedure, re-connect the power supply cord.
8. Check voltage between normal open terminal of the relay RY2 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, RY2, RY3, RY4, RY5 and RY6 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
RELAY SYMBOL
RY1
RY2(COOK)
RY3
RY4
RY5
RY6
9. Disconnect the power supply cord.
10. Open the door and block it open.
11. To discharge high voltage capacitor, wait for 60 seconds.
12. Reconnect all leads removed from components during testing.
13. Re-install the hood intake duct R.
14. Re-install the outer case (cabinet).
15. Reconnect the power supply cord after the outer case is installed.
O DEFROST CENTER TEST
(1) Open the door.
(2) Place one cup of water in the center of the turntable tray in the oven cavity.
(3) Touch the " DEFROST CENTER " pad once. And then touch the number pad " 2 ".
(4) Touch the number pad " 5 ".
(5) Close the door.
(6) Touch the " START " button.
(7) The oven is in Defrost center cooking condition.
TEST PROCEDURES
COMPONENT TEST
G 8 G 7 G 6
FRESH
HOT
2
ROLLS /
WATER
MUFFINS
KEEP
4
REHEAT
WARM
PLUS
BAKED
7
POTATOES
POWER
1
LEVEL
good, control unit is defective.
OPERATIONAL VOLTAGE
Approx. 25.0V D.C.
Approx. 24.5V D.C.
Approx. 25.0V D.C.
Approx. 25.0V D.C.
Approx. 25.0V D.C.
Approx. 25.0V D.C.
10
G 5 G 4 G 3
DEFROST CUSTOM
CENTER HELP
SENSOR
5
COOK POPCORN
CENTER
FRESH
8
VEGETABLES
FROZEN
0
BEVERAGE ROLLS /
MUFFINS
CONNECTED COMPONENTS
Oven lamp / Fan motor / Turntable motor
Power transformer
Hood motor
Hood motor
Hood lamp
Hood lamp
G 2 G 1
LIGHT
3
HI / LO
FAN
6
HI / LO
STOP
9
CLEAR
START
TIMER
MINUTE
CLOCK
PLUS