R-23AM. Revised (including ) - Sharp Home Appliance Service Manual (repair manual)

Page

SERVICING ................................................................................................................. INSIDE FRONT COVER
CAUTION, MICROWAVE RADIATION ............................................................................................................   1
WARNING .......................................................................................................................................................... 1
PRODUCT SPECIFICATIONS .........................................................................................................................  2
GENERAL INFORMATION ................................................................................................................................ 2
APPEARANCE VIEW .......................................................................................................................................  3
OPERATION SEQUENCE ................................................................................................................................  4
FUNCTION OF IMPORTANT COMPONENTS ................................................................................................   6
TROUBLESHOOTING GUIDE .......................................................................................................................... 7
TEST PROCEDURE .......................................................................................................................................... 9
TOUCH CONTROL PANEL ASSEMBLY ........................................................................................................ 15
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ...........................................................  21
MICROWAVE MEASUREMENT ....................................................................................................................  27
WIRING DIAGRAM .........................................................................................................................................  28
PICTORIAL DIAGRAM ...................................................................................................................................  30
CONTROL PANEL CIRCUIT ........................................................................................................................... 31
PRINTED WIRING BOARD ............................................................................................................................. 32
PARTS LIST ...................................................................................................................................................  33

In interests of user-safety the oven should be restored to its
original condition and only parts identical to those specified
should be used.

Because many parts have been changed to improve quality of this model from May 2005 production.

And the changed parts are not interchangeable. Please use this service manual for above products.

For old products, please use old service manual (No.SX910R24ATK//) and technical reports.

1800W/R-23AM

START

HIGH

MEDIUM

MED LOW

DEFROST

TIME 
CONTROL

1) Disconnect the supply.
2) Door opened, and wedged open.
3) Discharge high two voltage capacitors.

The two high-voltage capacitors remain charged
about 60 seconds after the oven has been switched
off. Wait for 60 seconds and then short-circuit the
connection of the two high-voltage capacitors (that
is, of the connecting lead of the high-voltage recti-
fier) against the chassis with use of an insulated
screwdriver.

Sharp recommend that wherever possible fault-finding
is 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 power transformer. Ensure that these leads re-
main 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 power transformer.

Microwave ovens contain circuitry capable of producing very high voltage and current. Contact with following parts
will result in electrocution.
High voltage capacitors, High voltage transformers, Magnetrons, High voltage rectifier assembly, High voltage
fuses, High voltage harness.

1) Reconnect all leads removed from components dur-

ing testing.

2) Replace the outer case (cabinet).
3) Reconnect the supply.
4) Run the oven. Check all functions.

Microwave ovens should not be run empty. To test for
the presence of microwave energy within a cavity, place
a cup of cold water on the oven turntable, close the door
and set  the microwave timer for one (1) minut. When the
one minute 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.

When all service work is completed and the oven is fully
assembled, the microwave power output should be
checked and microwave leakage test should be carried
out.

1

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.

Service engineers should not be exposed to the microwave
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.

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 "*" on parts list are used at voltages more
than 250V.

Removal of the outer wrap gives access to potentials above
250V.

All the parts marked "

∆" on parts list may cause undue micro-

wave exposure, by themselves, or when they are damaged,
loosened or removed.

PRODUCT SPECIFICATIONS

APPEARANCE VIEW

OPERATING SEQUENCE

FUNCTION OF IMPORTANT
COMPONENTS

SERVICING AND
TROUBLESHOOTING CHART

TEST PROCEDURE

TOUCH CONTROL PANEL
ASSEMBLY

COMPONENT REPLACEMENT
 AND ADJUSTMENT PROCEDURE

MICROWAVE MEASUREMENT

WIRING DIAGRAM

PARTS LIST

2

THE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING CODE:

GREEN-AND-YELLOW

: EARTH

BLUE

: NEUTRAL

BROWN

: LIVE

Power Requirements

230 - 240 Volts
50 Hertz
Single phase, 3 wire earthed

Power Comsumption

2.9 kW Approx. 13 A

Power Output

1900 W nominal of RF microwave energy (measured by method of IEC 60705)
Operating frequency 2450 MHz

Case Dimensions

Width  510mm
Height 335 mm
Depth  470mm

Cooking Cavity Dimensions

Width  330 mm
Height 180 mm
Depth   330mm

Control Complement

Electronic Timer (0 - 30 minutes)

Microwave Power level
100%  50% 20% 10%
MICROWAVE POWER LEVEL buttons
START button

Set Weight

Approx. 33 kg