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R-420BK
R-420BW
SERVICE MANUAL
SHARI?
Microwave Ovens
R=420BK/R=420BW
Foreword
This manual
has been prepared
to provide
Sharp
Electronics
Corporation
personnel
with
complete
operation and service information for Sharp microwave
oven models R-420BWR-420BW.
It is recommended
that service personnel
carefully
study the entire text of this manual so they will be
qualified to render satisfactory customer service.
Check interlock switches and the door seal carefully.
Special attention must be given to avoid electrical shock
and microwave radiation hazards.
WARNING
Never operate the oven until the following points are en-
sured:
(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 are no other visible signs of damage to the
oven.
DANGER
Certain initial parts are intentionally
not grounded
and present a risk of electrical shock only during
servicing. Service personnel - Do not contact the fol-
lowing parts while the appliance is energized;
High Voltage Capacitor, Power Transformer, Magne-
tron, High Voltage Rectifier Assembly and High volt-
age Harness.
If provided, Vent Hood, Fan Assembly and Cooling
Fan motor.
All of the parts marked "*" on parts list are used at volt-
ages more than 25OV.
Removal of the outer case cabinet gives access to volt-
age above 250V.
All of the parts marked "A" on parts list may cause undue
microwave exposure, by themselves, or when they are
damaged, loosened or removed.
Sharp Electronics Corporation
Sharp Plaza
Mahwah, New Jersey 07430-2135
Specifications
General Information
Key Unit Layout
b
Operation
Troubleshooting /
Touch Control Panel
Component Replacement
and Adjustment
Microwave Measurement
Wiring / Schematic Diagram
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Table of Contents
Troubleshooting
