Sharp R9h56 Service Manual

R-9H56
SHARP CORPORATION
  SERVICE MANUAL
In interests of user-safety the oven should be restored to its original
condition and only parts identical to those specified should be used.
MODELR-9H56
S8409R9H56PJ/
COVECTION
MICROWAVE OVEN
TABLE OF CONTENTS
Page
CAUTION, MICROWAVE RADIATION .............................  1
WARNING .......................... 1
PRODUCT SPECIFICATIONS .....................  2
GENERAL INFORMATION ........................ 2
APPEARANCE VIEW .............................  3...

R-9H56 

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SERVICE MANUAL
PRODUCT SPECIFICATIONS
SHARP CORPORATION
OSAKA, JAPAN
CAUTION
MICROWAVE RADIATION
DO NOT BECOME EXPOSED TO RADIATION FROM
THE MICROWAVE GENERATOR OR OTHER PARTS
CONDUCTING MICROWAVE ENERGY.
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...

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PRODUCT SPECIFICATIONS
ITEM DESCRIPTION
Power Requirements 240 Volts
50 Hertz
Single phase, 3 wire earthed
Power Consumption 1500 W (Microwave)
1600 W (Convection)
Power Output 750 watts nominal of RF microwave energy (AS 2895 1986)
850 watts (IEC-705-1988 )
Operating frequency of 2450MHz
Convection heater 1500 W
Case Dimensions Width 627mm
Height 378mm
Depth  483mm
Cooking Cavity Dimensions Width 410mm
Height 245mm
Depth  410mm
Control Complement Touch Control System
Clock ( 1:00 - 12:59)
Timer...

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APPEARANCE VIEW
111
1415
111
123
459
10
213
467 8
1. Ventilation opening
2. Oven lamp
3. Door hinges
4. Door safety latches
5. See through door
6. Door open button
7. Touch control panel
8. Digital readout
9. Wave guide cover
10. Coupling
11. Access cover for oven lamp replacement
12. Menu label
13. Rating label
14. low rack
15. High rack
TOUCH CONTROL PANEL
SMART
& EASY
REHEART
SENSOR
LOW MIXHIGH MIX GRILL
CONVEC
LESS MORE
123 45
678 90
STOP
CLEARAUTO
START
CLOCKINSTANT COOK
START
40˚C...

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OPERATION SEQUENCE
The following is a description of component functions during
oven operation.
Relay and Components Connection
RELAY CONNECTED COMPONENT
RY1 Oven lamp/ Turntable motor
RY2 Power transformer
RY3 Convection heater
RY4 Damper motor
RY5 Convection motor
RY6 Fan motor
OFF CONDITION
Closing the door activates all door interlock switches: upper
latch switch, lower latch switch and stop switch. (In this
condition, the monitor switch contacts are closed.)
When oven is plugged in a wall...

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2. The coil of relay (RY4) is energized by the CPU unit. The
damper is moved to the closed position, opening the
damper switch contacts. The opening of the damper
switch contacts sends a signal to the LSI on the CPU unit
de-energizing the relay (RY4) and opening the circuit to
the damper motor.
3. The coil of heater relay (RY3) is energized by the CPU
unit and the main supply voltage is added to the convection
heater.
4. When the oven temperature reaches the selected preheat
temperature, the...

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AH SENSOR COOKING SEQUENCE
1. In case the AH sensor cooking condition is started, the
coil of shut-off relays (RY1+RY6) are energized, the
oven lamp and cooling fan motor are turned on, but the
power transformer is not turned on.
NOTE: The oven should not be operated on AH SENSOR
COOKING immediately after plugging in the unit.
Wait five minutes before cooking on AH SENSOR
COOKING CONDITION.
2. After about 16 seconds, the cook relay (RY2) is energized.
The power transformer is turned on,...

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3. Once the fire sensor feature has shut the unit down, the
programmed cooking cycle may be resumed by  pressing
the START pad or the unit may be reset by pressing the
CLEAR pad.
IMPORTANT:
During sensor cooking operation, the fire sensing op-
eration sequence will not begin until the AH sensor has
detected vapours and initiated a sensor cooking cycle.
This is because the operation of the convection fan
would interfere with the AH sensors vapour detection.
CONVECTION
MOTOR
THERMISTOR
Sensing...

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FUSE M8A 250V
1. If the wire harness or electrical components are short-
circuited, this fuse blows to prevent an electric shock or
fire hazard.
2. The fuse also blows when upper latch switch and lower
latch switch remain closed with the oven door open and
when the monitor switch closes.
3. The fuse M8A also blows when asymmetric rectifier,
H.V. rectifier, H.V. wire harness, H.V. capacitor,
magnetron or secondary winding of power transformer is
shorted.
ASYMMETRIC RECTIFIER
The asymmetric...