Read Sharp R-657SL (serv.man10) Service Manual online
R657(W)
11 – 2
5. Remove the capacitor from the capacitor holder.
6. Now the high voltage rectifier and 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 primary connections from high voltage transformer.
3. Disconnect the filament leads of the high voltage transformer from
high voltage capacitor and the magnetron.
4. Disconnect the H.V. secondary wire (white) from the high voltage
capacitor.
5. Remove the two (2) screws holding the transformer to base plate.
6. Remove the transformer from the base plate by sliding it away from
the oven cavity and lifting it.
7. Disconnect the high voltage wire from the filament lead of the high
voltage transformer.
8. 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. Remove the one (1) screw holding the air intake duct to the latch
hook.
4. Remove the one (1) screw holding the chassis support to the mag-
netron.
5. Move the air intake duct to left.
6. Carefully remove four (4) screws holding magnetron to the
waveguide.
7. Remove the magnetron from the waveguide with care so the mag-
netron 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.
MOUNTING SCREWS ARE TIGHTENED SECURELY.
[6] FAN MOTOR REREPLACEMENT
1. REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnect the wire leads from the fan motor.
3. Remove the two (2) screws holding the fan motor to the oven cavity
back plate. The fan motor is now free.
4. 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 any pieces do not enter the gap
between the rotor and the starter of the fan motor.
Because the rotor is easy to be shaven by pliers and
metal pieces may be produced.
Because the rotor is easy to be shaven by pliers and
metal pieces may be produced.
• Do not let the pliers touch the coil of the fan motor
because the coil may be cut or damaged.
• Do not distort the bracket by touching with the pliers.
ii) Remove the fan blade from the shaft of the fan motor by pulling
and rotating the fan blade with your hand.
CAUTION: • Do not use this removed fan blade again. Because the
hole (for shaft) of it may become bigger than a standard
one.
one.
iii) Now, the fan blade will be free.
2. INSTALLATION
1. 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) 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.
CAUTION: • Do not hit the fan blade when installing because the
bracket may be deformed.
• Make sure that the fan blade rotates smoothly after
installation.
• Make sure that the axis of the shaft is not slanted.
2. Install the fan motor to the oven cavity back plate with the two (2)
screws.
3. Re-connect the wire leads to the fan motor, referring to the pictorial
diagram.
Gap
Rotor
Bracket
Stator
Groove joint pliers
Coil
Shaft
Axis
Stator
Rotor
These are the positions
that should be pinched
with pliers.
that should be pinched
with pliers.
Shaft
Table
Center of
bracket
bracket
Rear View
Side View
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