Read Sharp R-27STMA (serv.man11) Service Manual online
R27STMA
11 – 2
[3] HIGH VOLTAGE TRANSFORMER REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnect the wire leads (main wire harness) from high voltage
transformer.
3. Disconnect the filament lead of high voltage transformer from the
magnetron.
4. Disconnect the filament lead of the high voltage transformer from
high voltage capacitor.
5. Disconnect the high voltage wire of the high voltage transformer
from the high voltage capacitor.
6. Remove the four (4) screws holding the transformer to bottom plate
from below.
7. Remove the transformer.
[4] HIGH VOLTAGE RECTIFIER ASSEMBLY AND HIGH VOLTAGE CAPACITOR REMOVAL
To remove the components, proceed as follows.
1. CARRY OUT 3D CHECKS.
2. Disconnect the high voltage wire of the high voltage transformer
from the H.V. capacitor.
3. Disconnect the filament lead of the high voltage transformer from
the H.V. capacitor.
4. Remove one (1) screw holding capacitor holder to the oven cavity
back plate.
5. Remove one (1) screw holding earth side terminal of high voltage
rectifier assembly, and remove capacitor holder.
6. Disconnect all the leads and terminals of high voltage rectifier
assembly from high voltage capacitor.
7. Now H.V. rectifier assembly and H.V. capacitor should be free.
CAUTION: WHEN REPLACING HIGH VOLTAGE RECTIFIER
ASSEMBLY, ENSURE THAT THE CATHODE (EARTH)
CONNECTION IS SECURELY FIXED TO THE CAPACI-
TOR HOLDER WITH AN EARTHING SCREW.
CONNECTION IS SECURELY FIXED TO THE CAPACI-
TOR HOLDER WITH AN EARTHING SCREW.
CAUTION: DO NOT REPLACE ONLY HIGH VOLTAGE RECTIFIER.
WHEN REPLACING IT, REPLACE HIGH VOLTAGE REC-
TIFIER ASSEMBLY.
TIFIER ASSEMBLY.
[5] MAGNETRON REMOVAL
1. REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnect the wire leads from the magnetron.
3. Remove the two (2) screws holding the air duct to the oven cavity.
4. Release the air duct from the oven cavity.
5. Carefully remove the four (4) screws holding the magnetron to the
waveguide flange.
6. Lift up magnetron with care so that the magnetron antenna is not
hit by any metal object around antenna.
7. Now, the magnetron is free.
2. REINSTALLATION
1. Reinstall the magnetron to the waveguide flange with the four (4)
screws.
2. Reinstall the air duct to the oven cavity with the two (2) screws.
3. Reconnect the wire leads to the magnetron. Refer to “PICTORIAL
DIAGRAM”.
4. Reinstall the outer case and check that the oven is operating prop-
erly.
CAUTION: WHEN REPLACING THE MAGNETRON, BE SURE THE
R.F. GASKET IS IN PLACE AND THE MAGNETRON
MOUNTING SCREWS ARE TIGHTENED SECURELY.
MOUNTING SCREWS ARE TIGHTENED SECURELY.
[6] POSITIVE LOCK CONNECTOR (NO-CASE TYPE) REMOVAL
1. CARRY OUT 3D CHECKS.
2. Push the lever of positive lock
connector.
3. Pull down on the positive lock
connector.
CAUTION: WHEN CONNECTING THE POSITIVE LOCK
CONNEC-
TORS TO THE TERMINALS, CONNECT THE POSITIVE
LOCK
LOCK
SO THAT THE LEVER FACES YOU.
Figure C-1. Positive lock, connector
[7] TURNTABLE MOTOR REMOVAL
1. REMOVAL
1. Disconnect the power supply cord.
2. Remove turntable and turntable support from oven cavity.
3. Lay the oven on it's backside. Remove the turntable motor cover by
snipping off the material in four corners.
4. Where the corners have been snipped off bend corner areas flat.
No sharp edges must be evident after removal of the turntable
motor cover.
motor cover.
5. Disconnect wire leads from turntable motor.
(See “Positive lock connector removal”)
6. Remove one (1) screw holding turntable motor to oven cavity.
Terminal
Push
Pull down
1
2
Lever
Positive lock¨
connector
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