Sharp Carousel II R-3A54 Instrukcja serwisowa - Strona 13
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R-3E54
TEST PROCEDURES
(CONT'D)
PROCEDURE
LETTER
COMPONENT
TEST
F
THERMAL
CUT-OUT
TEST
CARRY OUT 30 CHECKS
Disconnect
the leads from the terminals
of the thermal cut-out.
Then using an ohmmeter,
make
a continuity
test across the two terminals
as described
in the table below.
CARRY OUT $FJ CHECKS
Table: Temberature
Fuse or Thermal
Cut-out
Test
Parts Name
Temperature
of "ON"
Temperature
of "OFF"
condition
(closed circuit).
condition
(open circuit).
Thermal cut-out
(Magnetron)
-20°C
I
Thermal cut-out
(Oven)
I
-2ok
Indication
of ohmmeter
(When room temperature
is
approx. 20°C.)
145Oc
Closed circuit
145°C
I
Closed circuit
If incorrect
readings are obtained,
replace the thermal cut-out.
An open circuit
thermal cut-out
(Magnetron)
indicates
that the magnetron
has overheated,
this may be due to resistricted
venti-
lation, cooling
fan failure or a fault condition
within
the magnetron
or HV circuit.
An open circuit
thermal
cut-out
(Oven)
indicates
that the foods in the oven may catch fire, this
may be due to over heating
produced
by improper
setting
of the cooking
timer or failure of the
control
panel.
G
MONITOR
RESISTOR
TEST
CARRY OUT 3D CHECKS.
Disconnect
the leads from the monitor
resistor or surge resistor.
Using an ohmmeter
and set on a low range.
Check between
the terminals
of the monitor
resistor or surge resistor as described
in the follow-
ing table.
Table: Resistance
I
Resistor
I
Resistance
I
I
Monitor
resistor
I
Approx.
0.8 ohms
I
If incorrect
readings are obtained,
replace the monitor
resistor or surge resistor
CARRY OUT 4R CHECKS.
H
MOTOR
WINDING
TEST
CARRY OUT 3D CHECKS
Disconnect
the leads from the motor.
Using an ohmmeter,
check the resistance
between the two
terminals
as described
in the table below.
Table: Resistance
of Motor
Motors
Resistance
Fan motor
Approximately
326 ohms
Turntable
motor
1
Aooroximatelv
16.08 kohms
I
If incorrect
readings are obtained,
replace the motor.
(Also refer to test procedure
I)
CARRY OUT @ CHECKS
13