Read Sharp R-23AM (serv.man2) Service Manual online
16
R - 2 2 A T
R-23AM
R - 2 4 A T
R-23AM
R - 2 4 A T
To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary on the
PWB, this foil pattern acts as a fuse. If the foil pattern is open, follow the troubleshooting guide given below
for repair.
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
OCCURRENCE
CAUSE OR CORRECTION
1
The rated AC voltage is not present at
Check supply voltage and oven power cord.
POWER terminal of CPU connector (CN-A).
2
The rated AC voltage is present at primary
Low voltage transformer or secondary circuit defective.
side of low voltage transformer.
Check and repair.
3
Only pattern at "a" is broken.
*Insert jumper wire J24 and solder for R-24AT / R-22AT.
*Insert jumper wire J9 and solder for R-23AM.
(CARRY OUT 3D CHECKS BEFORE REPAIR)
*Insert jumper wire J9 and solder for R-23AM.
(CARRY OUT 3D CHECKS BEFORE REPAIR)
4
Pattern at "a" and "b" are broken.
*Insert the coil RCILF2003YAZZ between "c" and "d".
(CARRY OUT 3D CHECKS BEFORE REPAIR)
(CARRY OUT 3D CHECKS BEFORE REPAIR)
NOTE: *At the time of these repairs, make a visual inspection of the varistor for burning damage and
examine the transformer with tester for the presence of layer short-circuit (check primary coil
resistance). If any abnormal condition is detected, replace the defective parts.
resistance). If any abnormal condition is detected, replace the defective parts.
CARRY OUT 4R CHECKS.
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
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
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. 19.0V D.C.
Oven lamp, Blower motor and Stirrer motors
RY3
APPROX. 16.0V D.C.
High voltage transformer 1
RY4
APPROX. 18.0V D.C.
High voltage transformer 2
RY1, RY2 and RY3 Relay Test For R-23AM
These relays are operated by D.C. voltage.
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.
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
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. 18.0V D.C.
Oven lamp, Blower motor and Stirrer motors
RY2
APPROX. 17.5V D.C.
High voltage transformer 1
RY3
APPROX. 17.5V D.C.
High voltage transformer 2
CARRY OUT 4R CHECKS.
R
PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING
BOARD(PWB) IS OPEN
BOARD(PWB) IS OPEN
(J29)
(VRS2)
VRS1
(J24)
(J23)
(9)
9(7)
5(3)
3(1)
RY1
D81
c
a
b
d
S1
S2
2
3
P
TI
C31
D23
+
–
VRS1
(J9)
(J8)
OL, BM
POWER
7
5
3
1
D21
CN–A
a
c
b
d
R-24AT / R-22AT
R-23AM
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