Troubleshooting - Sharp R-4A52 Service Manual

R-4A52
R-4E52
SERVICE MANUAL
SHARP
MICROWAVE OVEN
R-4A521 R-4E52
GENERAL IMPORTANT INFORMATION
This Manual has been prepared to provide Sharp Corp. Service
engineers with Operation and Service Information.
It is recommended that service engineers carefully study the
entire text of this manual, so they will be qualified to render
satisfactory customer service.
CAUTION
MICROWAVE RADIATION
Service engineers should not be exposed to the micro-
wave energy 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.
WARNING
Never operate the oven until the following points are
ensured.
(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.
Servicing and repair work must be carried out only by
trained service engineers.
All the parts marked "*Il on parts list are used at voltages
more than 25OV.
SHARP
CORPORATION
OSAKA, JAPAN
1
= ." PRODUCT SPECIFICATIONS
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OPERATING SEQUENCE
TROUBLESHOOTING CHAR
TEST PROCEDURE
TEST DATA TABLE AND
TEST POINTS ON CONTROL
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PRINTED WIRING BOARD
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,d PARTS LIST
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