High Voltage Components Removal; High Voltage Transformer Removal; Magnetron Removal; Fan Motor Replacement - Sharp R-890SLM Service Manual

R-890SLM

[3] HIGH VOLTAGE COMPONENTS REMOVAL

(HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY)
To remove the components, proceed as follows.
1. CARRY OUT 3D CHECKS.
2. Disconnect the filament lead of the high voltage transformer
and the high voltage wire A from the high voltage capacitor.
3. Remove one (1) screw holding earth side terminal of the
high voltage rectifier assembly.
4. Remove one (1) screw holding fan duct to the oven cavity
rear plate.
5. Remove one (1) screw holding capacitor holder to the oven
cavity rear plate.
6. Release the capacitor holder from the fan duct.
7. Remove the high voltage capacitor from the capacitor holder.

[4] HIGH VOLTAGE TRANSFORMER REMOVAL

1. CARRY OUT 3D CHECKS.
2. Disconnect the filament leads of high voltage transformer
from high voltage capacitor and the magnetron.
3. Disconnect the high voltage transformer secondary wire
from the high voltage transformer.
4. Disconnect the main wire harness from the high voltage
transformer.

[5] MAGNETRON REMOVAL

1. CARRY OUT 3D CHECKS.
2. Disconnect the H.V. wire and filament lead of the transformer
from the magnetron.
3. Remove the one (1) screw holding the chassis support to
the magnetron.
4. Move the air intake duct to left.

[6] FAN MOTOR REPLACEMENT

1. REMOVAL
1. CARRY OUT 3D CHECKS.
2. Remove the one (1) screw holding the noise filter to the
chassis support.
3. Release the noise filter from the tabs of the fan duct.
4. Remove the one (1) screw holding the chassis support to
the oven cavity front flange.
5. Remove one (1) screw holding the chassis support to the
magnetron.
6. Remove the chassis support from the oven cavity.
7. Disconnect the wire leads from the fan duct.
8. Remove the one (1) screw holding the capacitor holder to
the oven cavity back plate.
9. Release the tabs of the capacitor holder from the fan duct.
10. Remove the one (1) screw holding the fan duct to the oven
cavity back plate.
11. Remove the fan duct from the oven.
12. Remove the fan duct from the fan motor shaft according to
the following procedure.
i) Hold the edge of the rotor of the fan motor by using a pair
of groove joint pliers.
Service_R-890SLM.indd 24
8. Disconnect the high voltage rectifier assembly from the high
voltage capacitor.
9. Disconnect the high voltage rectifier assembly from the high
voltage capacitor.
10. Now, the high voltage rectifier assembly and the high volt-
age capacitor should be free.
CAUTION: WHEN REPLACING HIGH VOLTAGE RECTI-
FIER ASSEMBLY, ENSURE THAT THE CATHODE
(EARTH) CONNECTION IS SECURELY FIXED TO
THE CAPACITOR HOLDER WITH AN EARTHING
SCREW.
5. Remove the two (2) screws holding the transformer to the
base plate.
6. Remove the transformer.
7. Now the high voltage transformer is free.
5. Carefully remove four (4) screws holding the magnetron to
the waveguide. When removing the screws hold the magn-
etron to prevent it from falling.
6. Remove the magnetron from the waveguide with care so the
magnetron antenna is not hit by any metal object around the
antenna.
CAUTION: WHEN REPLACING THE MAGNETRON, BE
SURE THE R.F. GASKET IS IN PLACE AND
THE MAGNETRON MOUNTING SCREWS ARE
TIGHTENED SECURELY.
CAUTION: • Make sure that no swarf from the rotor enters the
gap between the rotor & stator of the fan motor.
• Avoid touch the coil of the fan motor with the pliers
as the coil may become cut or damaged.
• Avoid deforming the bracket whilst using the pliers.
ii) Remove the fan blade assembly from the shaft of the fan
motor by pulling and rotating the fan blade with your hand.
iii) Now, the fan blade is free.
CAUTION: Do not reuse the removed fan blade as the fixing
hole may be oversize.
13. Remove the two (2) screws holding the fan motor to the fan
duct.
14. Now, the fan motor is free.
2. INSTALLATION
1. Install the fan motor to the fan duct with the two (2) screws.
2. Install the fan blade to the fan motor shaft according to the
following procedure.
i) Hold the centre of the bracket which supports the shaft of
the fan motor on a flat table.
ii) Apply the screw lock tight into the hole (for shaft) of the
fan blade.
ii) Install the fan blade to the shaft of fan motor by pushing
the fan blade with a small, light weight, ball peen hammer
or rubber mallet.
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4/25/09 10:55:32 AM