Sharp Carousel R-880FS Service Manual - Page 19

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Sharp Carousel R-880FS Service Manual
PROCEDURE
LETTER
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 a 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.
CARRY OUT 4R CHECKS.
P
RELAY TEST
CARRY OUT 3D CHECKS.
Remove the outer case and check voltage between Pin No. 1 of the 3 pin connector (A) and the
common terminal of the relay RY6 on the control unit with an A.C. voltmeter.
The meter should indicate 230-240 volts, if not check oven circuit.
Relay Test
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation, grill
operation, convection operation or mix 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
RY3
RY4
RY5
RY6
CARRY OUT 4R CHECKS.
Q
PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD
(PWB) IS OPEN
To protect the electronic circuits, this model is provided with a fine foil pattern added to the input circuit
on the PWB, this foil pattern acts as a fuse. If the foil pattern is open, follow the troubleshooting guide
given below for repair.
Problem: POWER ON, indicator does not light up.
CARRY OUT 3D CHECKS.
STEPS
1
2
3
4
TEST PROCEDURES
G 8
5
160˚C
0
250˚C
INSTANT
COOK/
START
CONVEC
control unit is defective.
OPERATIONAL VOLTAGE
Approx. 24.0V D.C.
Approx. 24.0V D.C.
Approx. 24.0V D.C.
Approx. 24.0V D.C.
Approx. 24.0V D.C.
Approx. 24.0V D.C.
OCCURRENCE
The rated AC voltage is not present between
Pon No. 1 of the 3-pin connector (A) and the.
common terminal of the relay RY6.
The rated AC voltage is present at primary
side of low voltage transformer.
Only pattern at "a" is broken.
Pattern at "a" and "b" are broken.
COMPONENT TEST
G 7
G 6
G 5
2
3
4
150˚C
130˚C
70˚C
9
8
7
230˚C
220˚C
200˚C
POWER
Pasta
LEVEL
MORE
CLOCK
PREHEAT
GRILL
CONNECTED COMPONENTS
Convection motor
High voltage transformer
Grill heaters (Top)
Bottom heater
Fan motor
Oven lamp / Turntable motor
CAUSE OR CORRECTION
Check supply voltage and oven power cord.
Low voltage transformer or secondary circuit defective.
Check and repair.
*Insert jumper wire J1 and solder.
(CARRY OUT 3D CHECKS BEFORE REPAIR.)
*Insert the coil RCILF2003YAZZ between "c" and "d".
(CARRY OUT 3D CHECKS BEFORE REPAIR.)
17
G 4
G 3
G 2
1
EASY
MULTI
HELP
DEFROST
COOK
40˚C
6
REHEAT
Fresh
STOP/
SENSOR
Vegetables
CLEAR
180˚C
Frozen
CONVENIENCE
Jacket
Rice
Vegetables
Potato
Reheat
MIX
Pie
LESS
R-880F(S)
G 1
/PIZZA