Sharp R-1500AT, Service Manual

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R1500AT
9 – 2
10.Remove the six (6) screws holding the rear cover and exhaust
cover to the bottom plate, power supply cord angle, intake duct and
exhaust duct.
11.Remove the rear cover with the fan motor and exhaust cover from
the oven cavity.
12.Now, the rear cover with the fan motor and exhaust cover is free.
NOTE: Do not forget to re-connect the wire leads to the exhaust fan
when the rear cover and outer case cabinet are reinstalled.
[3] POWER TRANSFORMERS (1) AND/OR (2) REMOVAL
1. CARRY OUT 3D CHECKS.
2. Remove the rear cover.
3. Disconnect the main wire harness from power transformers (1)
and/or (2).
4. Disconnect wire leads of power transformers (1) and/or (2) from
magnetrons (1) and/or (2).
5. Disconnect wire leads of power transformers (1) and/or (2)from
high voltage capacitors (1) and/or (2).
6. Remove two (2) screws holding each power transformer (1) and/or
(2) to base plate.
7. Remove the power transformers (1) and/or (2) from base plate.
8. Now, power transformers (1) and/or (2) are free.
[4] MAGNETRONS (1) AND/OR (2) REMOVAL
1. CARRY OUT 3D CHECKS.
2. Remove the rear cover.
3. Disconnect the connector of the magnetron thermistor assembly
from the connector of the harness.
4. Remove the magnetron thermistor assembly from magnetrons.
5. Disconnect wire leads from magnetrons (1) and/or (2).
6. Remove the two (2) screws holding the bottom cover to the bottom
plate assembly.
7. Remove the bottom cover from the bottom plate assembly.
8. Remove the four (4) screws holding each magnetron (1) and/or (2)
to upper and/or lower waveguide. When removing the screws, hold
the magnetron to prevent it from falling.
9. Remove the magnetrons (1) and/or (2) from upper and/or lower
waveguide with care so magnetron antenna is not hit by any metal
object around antenna.
10.Remove the two (2) screws holding the partition plate S to each
magnetron (1) and/or (2).
11.Remove the two (2) partition plate S from each magnetron (1) and/
or (2).
12.Now, the magnetrons (1) and/or (2) are free.
CAUTION: WHEN REPLACING MAGNETRON, BE SURE THE R.F.
GASKET IS IN PLACE AND MOUNTING SCREWS ARE
TIGHTENED SECURELY.
NOTE: Whenever the magnetron is replaced, replace the weak point
for fan motor, too.
[5] MAGNETRON THERMISTOR ASSEMBLY REPLACEMENT
1. REMOVAL
1. CARRY OUT 3D CHECKS.
2. Remove the rear cover.
3. Disconnect the connector of the magnetron thermistor assembly
from the capacitor of the harness.
4. Remove the snap band of magnetron thermistor assembly from the
hole of the partition cover by pulling out.
5. Remove the magnetron thermistor assembly from the two (2) mag-
netrons.
6. Now, the magnetron thermistor assembly is free.
2. REINSTALLATION
1. Insert the magnetron thermistor assembly to the magnetron as
shown in Figure C-1 and push it until the thermistor assembly
stops.
i) The tabs of the magnetron thermistor assembly should be
inserted between the 2nd. fin and 3rd. fin.
ii) The thermistor should be inserted between the 1st. fin and 2nd.
fin.
iii) And also the thermistor should be inserted center of the right
and left walls of the magnetron.
2. Re-install the rear cover and outer case cabinet to the oven by
reversing the procedures of “OUTER CASE AND REAR COVER
REMOVAL”.
NOTE: Do not forget to re-connect the wire leads to the fan motor.
Figure C-1. Magnetron thermistor installation
[6] HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY REMOVAL
1. CARRY OUT 3D CHECKS.
2. Remove the rear cover.
3. Remove the two (2) screws holding the capacitor unit angle to the
intake duct assembly or the exhaust duct assembly.
4. Remove one (1) screw holding the capacitor band to capacitor unit
angle.
5. Remove one (1) screw holding earth side terminals of high voltage
rectifier assembly to the capacitor band.
Magnetron
Magnetron
thermistor
assembly
Center
Right wall
Left wall
Thermistor
1st. fin
2nd. fin
3rd. fin
Tab
Tab