Read Sharp R-2397G (serv.man2) Service Manual online
16
R-2297G
R-2397G
R-2397G
TEST PROCEDURES (CONT'D)
PROCEDURE
LETTER
COMPONENT TEST
CARRY OUT 3D CHECKS.
Remove the outer case and check voltage between Pin Nos. 5 and 7 of the connector (A) on the
control unit with an A.C. voltmeter. The meter should indicate 230~240 volts, if not check control unit
circuity.
control unit with an A.C. voltmeter. The meter should indicate 230~240 volts, if not check control unit
circuity.
RY1, RY3 and RY4 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.
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
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 motor
RY3
APPROX. 16.0V D.C.
Power transformer 1
RY4
APPROX. 18.0V D.C.
Power transformer 2
CARRY OUT 4R CHECKS.
P
RELAY TEST
Q
PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING
BOARD(PWB) IS OPEN
BOARD(PWB) IS OPEN
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.
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
OCCURANCE
CAUSE OR CORRECTION
1
2
3
4
Pattern at "a" and "b" are broken.
The rated AC voltage is not present at
POWER terminal of CPU connector (CN-A)
POWER terminal of CPU connector (CN-A)
The rated AC voltage is present at primary
side of low voltage transformer.
side of low voltage transformer.
Only pattern at "a" is broken.
Low voltage transformer or secondary circuit
deffective. Check and repair.
deffective. Check and repair.
*Insert jumper wire J24 and solder.
(CARRY OUT 3D CHECKS BEFORE REPAIR)
(CARRY OUT 3D CHECKS BEFORE REPAIR)
Check supply voltage and oven power cord.
*Insert the coil RCILF2003YAZZ between "c" and
"d". (CARRY OUT 3D CHECKS BEFORE
REPAIR)
"d". (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.
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.
CARRY OUT 4R CHECKS.
(J29)
(VRS2)
VRS1
(J24)
(J23)
(9)
9(7)
5(3)
3(1)
RY1
D81
c
a
b
d
Click on the first or last page to see other R-2397G (serv.man2) service manuals if exist.