Read Sharp R-772M (serv.man2) Service Manual online
engineers with Operation and Service Information.
of this manual, so they will be qualified to render satisfactory customer
which may radiate from the magnetron or other microwave
generating devices if it is improperly used or connected. All input
and output microwave connections, waveguides, flanges and
gaskets must be secured. Never operate the device without a
microwave energy absorbing load attached. Never look into an
open waveguide or antenna while the device is energized.
(A) The door is tightly closed.
(B) The door brackets and hinges are not defective.
(C) The door packing is not damaged.
(D) The door is not deformed or warped.
(E) There is not any other visible damage with the oven.
outer cabinet removed. (Because air flow is eliminated, and the
excess heat generated on adjacent components). It can cause
permanent damage or a fire.
AND TEST PROCEDURE
AND ADJUSTMENT PROCEDURE
2) Door opened, and wedged open.
3) Discharge high voltage capacitor.
onds after the oven has been switched off. Wait for 60
seconds and then short-circuit the connection of the high-
voltage capacitor (that is, of the connecting lead of the high-
voltage rectifier) against the chassis with the use of an
carried out with the supply disconnected. It may in, some
cases, be necessary to connect the supply after the outer
case has been removed, in this event carry out 3D checks and
then disconnect the leads to the primary of the High voltage
transformer. Ensure that these leads remain isolated from
other components and the oven chassis. (Use insulation tape
if necessary.) When the testing is completed carry out 3D
checks and reconnect the leads to the primary of the High
result in electrocution.
High voltage capacitor, High voltage transformer, Magnetron, High voltage rectifier assembly, High voltage harness.
2) Replace the outer case (cabinet).
3) Reconnect the supply.
4) Run the oven. Check all functions.
presence of microwave energy within a cavity, place a cup of
cold water on the oven turntable, close the door and set the
power to HIGH and set the microwave timer for two (2)
minutes. When the two minutes has elapsed (timer at zero)
carefully check that the water is now hot. If the water remains
cold carry out 3D checks and re-examine the connections to
the component being tested.
assembled, the microwave power output should be checked
and a microwave leakage test should be carried out.
Operating frequency 2450 MHz
100 (HIGH) ....................... Full power throughout the cooking time
70 (MEDIUM HIGH) ......................... approx. 70% of FULL Power
50 (MEDIUM) ................................... approx. 50% of FULL Power
30 (MEDIUM LOW) .......................... approx. 30% of FULL Power
10 (LOW) ......................................... approx. 10% of FULL Power
AUTO COOK key, AUTO DEFROST key, WEIGHT keys
LESS/MORE keys, OVEN (˚C) key, GRILL key
DUAL /GRILL key, MICROWAVE POWER LEVEL key
STOP/CLEAR key, START/AUTO MINUTE key, TIMER key
WEIGHT CONVERSION key, AUTO START/CLOCK key,
12.Power supply cord
2. Oven lamp
3. Grill heating element (Top Grill)
4. Door opening button
5. Waveguide cover
6. Oven cavity
7. Turntable motor shaft
Press to shorten or lengthen heating time.
Press to select Dual Grill.
Use to set the clock.
Press to start a programme. Press to cook on
(HIGH) for 1 minute or increase time during
cooking in multiples of 1 minute.
Use to select cooking time.
Press once to stop a programme,
and/or twice to cancel a programme.
Press to select microwave
Press to select Grill.