Sharp Carousel II R-3A54 Manual de servicio - Página 15

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R -3A54
R-3E54
TEST
PROCEDURES
(CONT'D)
PROCEDURE
LETTER
COMPONENT
TEST
b) When touching
the pads, no pads produce
a signal.
2-2 In connection
with
indicators
a)
At a certain digit, all or some segments
do not light up.
b)
At a certain digit,
brightness
is low.
c)
Only one indicator
does not light.
d)
The corresponding
segments
of all digits do not light up; or they continue
to light up.
e)
Wrong figure appears.
f)
A certain group of indicators
do not light up.
g)
The figure of all digits flicker.
2-3 Other possible troubles
caused by defective
control
unit.
a)
Buzzer does not sound or continues
to sound.
b)
Clock does not operate properly.
c)
Cooking
is not possible.
d)
Proper temperature
measurement
is not obtained.
RELAY TEST
1.
2.
3.
4.
5.
6.
CARRY OUT 3D CHECKS
Disconnect
the leads from the primary of the power transfomer.
Make sure that the leads re-
main isolated from other oven components
and chassis. (Use insulation
tape if necessary,)
Close the door.
Reconnect
the supply.
Check the voltage
between
Pin Numbers 3 and 5 of 4-pin
connector
(A) on the control
unit
with an A.C. voltmeter.
The meter should
indicated
240 volts, if no check oven circuit.
RYI AND RY2 TEST
These are operated
by D.C. voltage.
Check voltage
at 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 di-
ode is good, control
unit is defective.
RELAY
SYMBOL
OPERATIONAL
VOLTAGE
CONNECTED
COMPONENTS
RYl
Approx.
26.5V.D.C.
Oven lamp/Turntable
motor/Cooling
fan motor
-____
RY2
Approx.
25.8V.D.C.
Power transformer
15