Sharp R-27STM, Service Manual

Page: 15 / 28

R-27STM
15
CARRY OUT 1. 3D CHECKS.
Disconnect the wire leads (main wire harness and H. V. 2.
fuse) from high voltage transformer.
Disconnect the filament lead of high voltage transformer 3.
from the magnetron.
Disconnect the filament lead of the high voltage transformer
4.
from high voltage capacitor.
Remove the two (2) screws holding the transformer to bot - 5.
tom plate from below.
Remove the two (2) screws holding the transformer to bot - 6.
tom plate from above.
Remove the transformer. 7.
HIGH VOLTAGE TRANSFORMER REMOVAL
fier assembly from high voltage capacitor.
Disconnect the H. V. fuse from the high voltage capacitor. 8.
Now H. V. rectifier assembly, H. V. fuse and H. V. capacitor
9.
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.
CAUTION: DO NOT REPLACE ONLY HIGH VOLTAGE REC -
TIFIER. WHEN REPLACING IT, REPLACE HIGH
VOLTAGE RECTIFIER ASSEMBLY.
HIGH VOLTAGE RECTIFIER ASSEMBLY, HIGH VOLTAGE FUSE AND HIGH VOLTAGE CAPACITOR REMOVAL
To remove the components, proceed as follows.
CARRY OUT 1. 3D CHECKS.
Disconnect the H. V. fuse from the high voltage transformer. 2.
Disconnect the H. V. wire of the H. V. rectifier assembly from
3.
the magnetron.
Disconnect the filament lead of the high voltage transformer
4.
from the H. V. capacitor.
Remove one (1) screw holding capacitor holder to the oven 5.
cavity back plate.
Remove one (1) screw holding earth side terminal of high 6.
voltage rectifier assembly, and remove capacitor holder.
Disconnect all the leads and terminals of high voltage recti - 7.
MAGNETRON REMOVAL
REMOVAL
CARRY OUT 1. 3D CHECKS.
Disconnect the wire leads from the magnetron. 2.
Remove the two (2) screws holding the air duct to the oven 3.
cavity.
Release the air duct from the oven cavity. 4.
Carefully remove the four (4) screws holding the magnetron 5.
to the waveguide flange.
Lift up magnetron with care so that the magnetron antenna 6.
is not hit by any metal object around antenna.
Now, the magnetron is free. 7.
REINSTALLATION
Reinstall the magnetron to the waveguide flange with the 1.
four (4) screws.
Reinstall the air duct to the oven cavity with the two (2) 2.
screws.
Reconnect the wire leads to the magnetron. Refer to "PIC
- 3.
TORIAL DIAGRAM".
Reinstall the outer case and check that the oven is operating
4.
properly.
CAUTION: WHEN REPLACING THE MAGNETRON, BE SURE
THE R. F. GASKET IS IN PLACE AND THE MAGN -
ETRON MOUNTING SCREWS ARE TIGHTENED
SECURELY.
POSITIVE LOCK CONNECTOR (NO-CASE TYPE) REMOVAL
CARRY OUT 1. 3D CHECKS.
Push the lever of positive lock, connector.
2.
Pull down on the positive lock, connector.
3.
CAUTION: WHEN CONNECTING THE POSITIVE LOCK, CON -
NECTORS TO THE TERMINALS, CONNECT THE
POSITIVE LOCK, SO THAT THE LEVER FACES
YOU.
Terminal
Push
Pull down
1
2
Lever
Positive lock¨
connector
Figure C-1. Positive lock, connector
TURNTABLE MOTOR REMOVAL
REMOVAL
Disconnect the power supply cord. 1.
Remove turntable and turntable support from oven cavity. 2.
Lay the oven on it's backside. Remove the turntable motor
3.
cover by snipping off the material in four corners.
Where the corners have been snipped off bend corner areas 4.
flat. No sharp edges must be evident after removal of the
turntable motor cover.
Disconnect wire leads from turntable motor. (See "Positive
5.
lock connector removal")
R27STM.indd 15 11/3/08 2:04:27 PM