Read Sharp R-98STMA (serv.man11) Service Manual online
R98STMAA
11 – 2
4. Remove one (1) screw holding earth side terminal of the high volt-
age rectifier assembly to the base plate through the capacitor
holder.
holder.
5. Release the capacitor holder from the base plate.
6. Remove the high voltage capacitor from the capacitor holder.
7. Disconnect the high voltage rectifier assembly from the high volt-
age capacitor.
8. Now, the high voltage rectifier assembly and the high voltage
capacitor should be free.
CAUTION: WHEN REPLACING HIGH VOLTAGE RECTIFIER
ASSEMBLY, ENSURE THAT THE CATHODE (EARTH)
CONNECTION IS SECURELY FIXED TO THE BASE
PLATE THROUGH THE CAPACITOR HOLDER WITH AN
EARTHING SCREW.
CONNECTION IS SECURELY FIXED TO THE BASE
PLATE THROUGH THE CAPACITOR HOLDER WITH AN
EARTHING SCREW.
[4] HIGH VOLTAGE TRANSFORMER REMOVAL
To remove the components, proceed as follows.
1. CARRY OUT 3D CHECKS.
2. Disconnect the main wire harness from the high voltage trans-
former.
3. Disconnect the filament leads and high voltage wire of high voltage
transformer from high voltage capacitor and the magnetron.
4. Remove the two (2) screws holding the transformer to the base
plate.
5. Remove the transformer.
6. Now the high voltage transformer is free.
[5] MAGNETRON REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnect the H.V. wire and filament lead of the transformer from
the magnetron.
3. Carefully remove two (2) screws holding the magnetron to the
waveguide, when removing the screws hold the magnetron to pre-
vent it from falling.
vent it from falling.
4. Remove the one (1) screw holding the magnetron to the chassis
support.
5. Remove the magnetron from the waveguide with care so the mag-
netron antenna is not hit by any metal object around the antenna.
6. Now, the magnetron is free.
CAUTION: CAUTION: WHEN REPLACING THE MAGNETRON, BE
SURE THE R.F. GASKET IS IN PLACE AND THE MAG-
NETRON MOUNTING SCREWS ARE TIGHTENED
SECURELY.
NETRON MOUNTING SCREWS ARE TIGHTENED
SECURELY.
[6] CONTROL PANEL ASSEMBLY REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnect the wire leads and the connectors from the control unit.
3. Remove the one (1) screw holding the control panel to the oven
cavity face plate.
4. Remove the one (1) screw holding the earth wire to the oven cavity
face plate.
5. Lift up the control panel assembly and pull it forward.
Now the control panel assembly is free.
NOTE: 1) Before attaching a new key unit, wipe off remaining adhe-
sive on the control panel frame surfaces completely with a
soft cloth soaked in alcohol.
soft cloth soaked in alcohol.
2) When attaching the key unit to the control panel frame,
adjust the upper edge and right edge of the key unit to the
correct position of control panel frame.
correct position of control panel frame.
3) Stick the key unit firmly to the control panel frame by rub-
bing with soft cloth not to scratch.
[7] FAN MOTOR REREPLACEMENT
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 three(3) screw holding the chassis support to the oven
cavity front flange, back plate, and the magnetron.
5. Remove the chassis support from the oven cavity.
6. Disconnect the wire leads from the fan duct.
7. Remove the one (1) screw holding the fan duct to the back plate.
8. Release the tabs of the fan duct from back plate.
9. Remove the fan duct from the oven.
10.Remove the fan blade from the fan motor shaft according to the fol-
lowing procedure.
i)
Hold the edge of the rotor of the fan motor by using a pair of
groove joint pliers.
groove joint pliers.
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 re-use the removed fan blade as the fixing hole may
be oversize.
11.Remove the two (2) screws holding the fan motor to the fan duct.
12.Now, the fan motor is free.
2. INSTALLATION
1. Install the fan motor to the fan duct with the two (2) screws and
nuts.
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.
fan motor on a flat table.
ii) Apply the screw lock tight into the hole (for shaft) of the fan
blade.
iii) 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.
mallet.
Click on the first or last page to see other R-98STMA (serv.man11) service manuals if exist.