Sharp R-961 (W) - Component Replacement and Adjustment Procedure

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
adhesive on the contro! panel frame surfaces completely
with alcohol and so on.
. When attaching the key unit to the control panel frame,
adjust the upper edge and right edge of the key unit tothe
MAGNETRON REMOVAL
1.
2.
3.
4.
5.
6.
CARRY OUT 3D CHECKS.
Disconnect the H.V. wire A and filament lead of the
transformer from the magnetron.
Remove the one (1) screw holding the chassis support to
the magnetron.
Remove the one (1) screw holding the magnetron guide
to the magnetron.
Remove the magnetron guide from the magnetron.
Carefully remove four (4) screws holding magnetron to
waveguide.
FAN MOTOR REPLACEMENT
REMOVAL
1.
2.
3.
2 N
CARRY OUT 3D CHECKS.
Disconnect the wire leads from the fan motor and the
thermal cut-out (FAN).
Remove the one (1) screw holding the damper
mounting angle to the chassis support.
Removethe four (4) screws holding the chassis support
to the oven cavity, fan duct, magnetron and back plate.
Release the chassis support from the oven.
Remove the two (2) screws holding the fan duct to the
waveguide.
Remove the fan duct from the oven.
Remove the fan blade assembly from the fan motor
shaft according to the following procedure.
1) Hold the edge of the rotor of the fan motor by using
a pair of groove joint pliers.
CAUTION:
¢ Make sure that any pieces do not enter the gap
between the rotor and the stator of the fan motor.
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.
2) Remove the fan blade assembly from the shaft of the
fan motor by pulling and rotating the fan blade with
your hand.
3) Now, the fan blade assembly will be free.
CAUTION:
* Do not use this removed fan blade again.
Because the hole (for shaft) in it may
become bigger than a standard one.
Remove the two (2) screws holding the fan motor to
the fan duct.
Rotor
Side view
R-961 -
Rear view
3.
correct position of control panel frame.
Stick the key unit firmly to the control panel frame by
rubbing with soft cloth so as not to scratch.
. Remove the magnetron from the waveguide with care so
the magnetron antenna is not hit by any metal object
around the antenna.
. Now, the magnetron is free.
CAUTION: WHEN REPLACING THE MAGNETRON,
BE SURE THE R.F. GASKET IS IN PLACE
AND THE MAGNETRON MOUNTING
SCREWS ARE TIGHTENED SECURELY.
10. Remove the one (1) screw and nut holding the thermal
cut-out angle to the fan motor.
11. Now, the fan motor is free.
INSTALLATION
1. Install the thermal cut-out angle to the fan motor with
the one (1) screw and nut.
2. Install the fan motor to the fan duct with the two (2)
Screws.
3. Install the fan blade assembly to the fan motor shaft
according to the following procedure.
1) Holdthe centre of the bracket which supports the shaft
of the fan motor on the flat table.
2) Applythescrewlock tight into the hole (for shaft) of the
fan blade assembly.
3) Install the fan blade assembly to the shaft of fan motor
by pushing the fan blade assembly with a small, light
weight, ball peen hammer or rubber malet.
CAUTION:
* Donothitthe fan blade assembly when installed
because the bracket may be deformed.
¢ Make sure that the fan blade assembly rotates
smoothly after installation.
¢ Make sure that the axis of the shaft is not
slanted.
4. Install the fan duct to the waveguide with the two (2)
screws.
5. Install the chassis support to the oven cavity, fan duct,
magnetron and back plate.
6. Install the damper mounting angle to the chassis
support with one (1) screw.
Re-connect the wire leads to the fan motor and the
thermal cut-out (FAN), referring to the pictcri al Diagram.
ih ie ae iy positions
which should be
pinched
with
pliers
Table
Center
of
bracket
Pre