Sharp R-5A12 User manual

R-5A12 . .
SHARP SERVICE MANUAL
S7002R5Al ZJ//
MICROWAVE OVEN
MODEL R-5Al2
In interests of user-safety the oven should be restored to its original
condition and only manufacturer original spare parts must be used.
This is a supplemental Service Manual for Model R-5A12.
This model is quite similar to Base Model R-5A’ll (Refer No. is S7905R5All JZ/).
Use this supplemental manual together with the Base Model Service Manual.
Refer to the Base Model Service Manual for complete operation, service information, etc.
TABLE OF CONTENTS
FOREWORD Page
I ...............*..................................*............*....................................................................................... 1 CAUTION, MICROWAVE RADIATION, WARNING ....................*.........*............................*......................... 1
PRODUCT DESCRIPTION ............................................................................................................................... 2
APPEARANCE VIEW ....................................~.............................I..................................................................... 3
MICROWAVE MEASUREMENT PROCEDURE ......................................................*...................................... 4
PICTORIAL DIAGRAM .............*..........................*............................................................................................ 5
CONTROL PANEL CIRCUIT ......................*..........*.......................*................................................*................. 6
PRINTED WIRING BOARD ............................................*...............................................................*................
PARTS LIST .....~................................................................................................................................................. ii
SHARP CORPORATION

R-5A12
SERVICE MANUAL
MICROWAVE OVEN
R-5A12
FOREWORD
This Manual has been prepared to provide Sharp Corp. Service
Personnel with Operation and Service Information for the
SHARP MICROWAVE OVEN, R-5A12.
The Model R-5A12 is quite similar to Base Model R-5All
(Refer No. S7905R5All JZ/).
It is recommended that service personnel carefully study the
entire text of this manual and Base Model 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 is eneraized.
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 ‘I+” on parts list are used at voltages
more than 250V.
SHARP CORPORATION
OSAKA, JAPAN
1

-~
R-5A12
PRODUCT DESCRIPTION
SPECIFICATIONS
ITEM
Power Requirements 1 240 Volts
50 Hertz
DESCRIPTION
Power Consumption
Power Output
Case Dimensions
Single phase, 3 wire earthed
1500w
750 watts nominal of RF microwave energy
Operating frequency of 2450M Hz
Width 616 mm
Height 366 mm
Depth 477 mm
Cooking Cavity Dimensions Width 406 mm
Height 248 mm
Depth 422 mm
Control Complement Touch Control System
Clock( I:00 - 12:59 )
Timer (0 - 99 min. 99 sec. )
Microwave Power for Variable Cooking
Repetition Rate;
HIGH ................................ Full power throughout the cooking time
MED HIGH .......I....................................... approx. 70% of Full Power
MED ...*...................... ..........................*..... approx. 50% of Full Power
MED LOW (DEFROST) .,.......*..-............. approx. 30% of Full Power
LOW .......................................................... approx. 10% of Full Power
INSTANT COOK/START
AUTO START
MEMORY
AUTO COOK
EASY DEFROST
EASY REHEAT
Set Weight MORE(A)/LESS(~) pads
Approx. 23 kg

R-5A12
APPEARANCE VIEW
I
I
1. Ventilation openings 8. Touch Control Panel
2. Oven lamp 9. Digital readout
3. Hinges 10. Waveguide cover
4. Safety door latches 11. Access cover for oven lamp replacement
5. See through door 12. Power supply cord
13. Roller Stay
6. Coupling
7. Door open button 14. Turntable
*Place the roller stay on
the coupling in the oven
and seat the turntable on
the roller stay.
TOUCH CONTROL PANEL
AUTO COOK
Touch to select Auto Cook
mode.
AUTO COOK MENUS-
NUMBER PADS
Touch to enter cooking times,
clock time, weight or quantity
of food, or to select the Auto
Cook or Easy Reheat menus.
AUTO START/CLOCK PAD-
Touch to set clock or Auto
Start time.
VARIABLE COOKING -
CONTROL PADS
Touch to select microwave
power setting.
If not touched, HIGH is auto-
matically selected.
STOP/CLEAR PAD
Touch to erase during pro-
gramming.
Touch once to stop operation
of oven during cooking; touch
twice to cancel cooking pro-
gramme.
EASY REHEAT PAD
Touch to select Easy Reheat
mode.
EASY REHEAT MENUS
EASY DEFROST PAD
Touch to defrost meat by
b Jacket potatoes entering weight.
MEMORY
Touch to enter one frequently
used cooking programme.
Touch to recall the memorized
programme.
MORE( - 1, LESS( v ) PADS
Touch to increase/decrease
the time in one minute incre-
ments during cooking or to
increase/decrease the time
whilst programming the Easy
Reheat, Auto Cook or Easy
Defrost modes.
rlNSTANT COOK/START PAD
Touch once to cook for 1
minute at HIGH or increase by
1 minute multiples each time
this pad is touched during
cooking.
Touch to start oven after
setting programmes.
3

R-5A12
MICROWAVE MEASUREMENT
After adjustment of door latch switches, monitor
switch and door are completed individually or collec-
tively, the following leakage test must be performed
with a survey instrument and it must be confirmed that
the result meets the requirements of the performance
standard for microwave oven.
REQUIREMENT
The safety switch must prevent microwave radiation
emission in excess of 5mW/cm2 at any point 5cm or
more from external surface of the oven.
PREPARATION FOR TESTING:
Before beginning the actual test for leakage, proceed
as follows;
I. Make sure that the test instrument is operating
normally as specified in its instruction booklet.
Important:
Survey instruments that comply with the require-
ment for instrumentations as prescribed by the per-
formance standard for microwave ovens must be
used for testing.
Recommended instruments are:
NARDA 8100
NAR DA 8200
HOLADAY HI 1500
SIMPSON 380M
2. Place the oven tray into the oven cavity.
3. Place the load of 275 +I 5ml of water initially at
20+5”C in the center of the oven tray. The water
container should be a low form of 600 ml beaker
with inside diameter of approx. 8.5cm and made of
an electrically non-conductive material such as
glass or plastic.
The placing of this standard load in the oven is im-
portant not only to protect the oven, but also to in-
sure that any leakage is measured accurately.
4. Close the door and turn the oven ON with the timer
set for several minutes. If the water begins to boil
before the survey is completed, replace it with
275ml of the cool water.
5. Move the probe slowly (not faster that 2.5cm/sec.)
along the gap.
6. The microwave radiation emission should be meas-
ured at any point of 5cm or more from the external
surface of the oven.
Microwave leakage measurement at 5 cm distance

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MAIN
Touch control unit SUPPLY
CORD
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CN-E
CN-A
1 3 5 7
MAGNETRON
STOP OVEN CAVITY SIDE
LOWER LATCH
Note 1. @ is Positive lock% connector.
2. YELLOW lead wire may be Pink.
Figure S-l. Pictorial Diagram
1 I 1 I I I I
I cl I ll I m I u I (I I UJ I Y

R-5A12
1 I 2 I 3 4 5 I 6
1 I 2 I 3 I 4 I 6 I 6
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F
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A
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6

R-5A12
1 2 3 I 4 5 6
3
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3
vr
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F--l ’
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Figure S-3. Printed Wiring Board
1 2 3 4 I 5 6
A
B
C
D
E
F
G
H
7

R-5A12
PARTS LIST
Note : The voltage supplied to the parts “*” are greater than 250V.
REF. NO. 1 PART NO. I DESCRIPTION 1Q’TY (CODE
ELECTRICAL PARTS
l- 1 QACCAA018WREO Power supply cord 1 AP
l- 2 QFS-CAOlOWREO Fuse M8A 1 AE
l- 3 QFSHDA002WREO Fuse holder(For Australia) 1 AE
l- 4 QFS-TAOlOWREO Temp. fuse 115°C 1 AG
l- 5 QSOCLAOOlWREO Oven lamp socket 1 AK
l- 6 QSW-MA007WREO Upper and lower latch switches and 3 AE
stop switch(V-5230D-069)
l- 7 RLMPTA029WREO Oven lamp 1 AK
l- 8 QSW-MA009WREO Monitor switch (V-5220D-070) AE
l- 9 RMOTEA162WREO Cooling fan motor i AW
l-10 RMOTDA055WREO Turntable motor 1 AR
l-11 RTRN-A246WREO Power transformer 1 BM
l-12 RC-QZA075WREO High voltage capacitor 1 AU
l-13 FH-DZAOOSWREO High voltage rectifier ass'y AP
l-14 RV-MZA089WREO Magnetron i BG
l-16 RTHM-A015WREO Thermal cut-out 115°C 1 AF
l-17 RR-WZA003WREO Monitor resistor 0.8n 20W 1 AF
GCABUA260WRPO
GDAI-A138WRWO
LANGK0243WRPO
GLEGP0021WREO
LSTPP0065WRFO
LSTPP0066WRFO
LANGQ0382WRMO
PCUSGAlGOWREO
PCUSGA240WRPO
CABINET PARTS
Outer case cabinet
Base plate (right)
Capacitor holder
Foot
Cord anchorage (upper)
Cord anchorage (lower)
Earth angle
Vibration proof cushion
Vibration cushion
BA
AP
AC
AB
AA
AB
AD
AD
CONTROL PANEL PARTS
3- 1 CPWBFA346WRKO Control unit(Not Replacement Item)
3- 1A QCNCMA078DREO 4-pin connector (A)
3- 1B QPLGJ2255DREO 3-pin connector (B) 1
3- 1c QCNCWA030DREO 12-pin connector (D) 1
3- 1D RV-KXA009DREO Fluorescent display tube 1
RC-KZA032DREO Capacitor. O.lpF 50V 1
RC-EZA192DREO Capacitor 1OOOpF 35V 1
c4,7 VCKYF31HF103Z Capacitor O.OlpF SOV 2
c5 VCEAB31EW476M Capacitor 47pF 25V
C6,20, VCKYBllEX103N Capacitor O.OlpF 25V 4'
C21,40
C80 RC-KZAO65DREO Capacitor O.lpF 25V --
C81 VCEAB31VW475M Capacitor 4.7pF 35V t
c90 VCC-F31H-680J Capacitor 68pF 5ov
C91 VCC-F31H-181J Capacitor 180PF 5ov
CF90 RCRS-2008DRE0 Ceramic filter KBRGOOB (6OOkHz) 1
Dl-5 VHDMPGOGB//-1Diode (MPGOGB) 5
D40, VHDlSS270A/-1 Diode (lSS270A) 11
D50-56,
D80,81,
D83
ICl
IC2
220,83
330
RH-IZA323DREO LSI
RH-IXAOlODREO IC (pPC79L12J)
VSDTC114ES/-3 Transistor (DTC114ES)
VSDTA114ES/-3 Transistor (DTA114ES)
VSDTD143ES/-3 Transistor (DTD143ES)
VRS-B13AA331J Resistor 33ofI 1w
VRD-Bl2HF750J Resistor 7511 1/2w
VRD-B12EF821J Resistor 82Of2 1/4W
1 AS
1 AD
2 AB
1 AB
1
1
1
1
BQ
AD
AB
AE
AW
AB
AD
A?4
AB
zu
AB
AA
AA
AB
AF
AA
AA
AC
AA
AA
AA