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TEST PROCEDURES
(CONT'D)
PROCEDURE
LETTER
COMPONENT
TEST
0
RELAY TEST
Remove the outer case and check voltage
between
Pin Numbers 1 and 3 of the 3-pin
connector
(A) on the control
unit with an A.C. voltmeter.
The meter should
indicate
240 volts, if not check oven circuit.
Shut-off,Cook
and Heater
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
or convection
cooking
operation.
DC. voltage
indicated
. . . . . . . . . . Defective
relay.
DC. voltage
not indjcated
. . . . . . ..Check diode which
is connected
to the relay coil. If diode is
good, control
unit is defective.
I
RELAY SYMBOL
1
OPERATIONAL
CONNECTED
COMPONENTS
VOLTAGE
I
RYl
Approx. 18 V.D.C.
RY2(COOK)
Approx. 18 V.D.C.
RY3( HEATER)
Approx. 18 V. D.C.
RY4
Approx. 18 V. D.C.
RY5
Approx. 18 V. D. C.
RY6
Aoorox. 18 V.D.C.
Oven lamp and Turntable motor
Power transformer
Heating element
Damper motor
Convection motor
Coolina fan motor
P
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
primary on the PWB, this foil pattern serves as a substitute
coil. If the foil pattern is open, follow
the troubleshooting
guide given below for repair.
Problem:
POWER ON, indicator
does not light UD.
STEPS
OCCURANCE
CAUSE OR CORRECTION
1
The rated voltage is not applied to POWER terminal
Check supply voltage and oven power cord.
of CPU connector (CN-A)
2
The rated voltage is applied to primary side of power
Power transformer
or secondary
circuit defective.
transformer.
Check and repair.
3
Only pattern at "a" is broken.
'Insert jumper wire 1 and solder.
4
Pattern at "a" and "b" are broken.
*insert the coil RCILF2003YAZZ
between "c" and
"d".
NOTE:* At the time of these repairs, make visual in-
spection 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.
11
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