Page 1
_ .“” 1 *I ”
R-7Hll
R-7H21
SHARP SERVICE MANUAL
S8907R7Hll JZ/
CONVECTION
MICROWAVE OVEN
MODELS R-THY 1
R-7H21
In interests of user-safety the oven should be restored to its original
condition and only manufacturer original spare parts must be used.
(R016101U)
I
TABLE OF CONTENTS
Page
FOREWORD
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...............................
1 -
CAUTION, MICROWAVE RADIATION
. . ..*.............................................*..............*........................................
PRODUCT DESCRIPTION
. . . . . . . . . . . . . ..*.............................*..............................................*..................................
:
GENERAL
INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ......
3
OPERATION
..,........................~..........*.............,...............*.......................~............*.............................................
SERVICING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..~....................................................................................
1:
TOUCH
CONTROL
PANEL ASSEMBLY . . . . . . . . . , . . . . . . . . . . . . . . . . . . ..*...................................................................... 24
COMPONENT REPLACEMENT AND
ADJUSTMENT PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
MICROWAVE MEASUREMENT PROCEDURE ..,......,......................................................................,......... 39
PICTORIAL DIAGRAM . . . . . . . . . . . ..~.................................................................................................................... 40
CONTROL PANEL CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..~.............~................................................
42
PRINTED WIRING BOARD
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..~..~..........
43
PARTS LIST . . . . . . . . . ..~..~..............................................................~............*..............................*.......*..*.~.............
PACKING AND ACCESSORIES
. . . . . . . . . . . . . . . . . . . . . . . *.* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
SHARPCORPORATtON
Page 2
R-7Hll
R-7H21
SERVICE MANUAL
SHAFZP
CONVECTION MICROWAVE OVEN
R-7H11/ R-7H21
FOREWORD
This Manual has been prepared to provide Sharp Corp. Service
Personnel with Operation and Service Information for the
SHARP CONVECTION MICROWAVE OVENS, R-7Hl I/
R-7H21.
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 door seal carefully. Special attention should be given to avoid electrical shock and microwave radiation hazard.
(RD36102U)
CAUTION
MICROWAVE RADIATION
Personnel 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.
Note( Parts List)
: The parts marked N*fl are used in voltage
more than 250V.
(RD36202U)
SHARPCORPORATtON
OSAKA, JAPAN
SPECIFICATIONS
AND ADJUSTMENT PROCEDURE
I>
+&ha*
‘:i; pq
_ ,^ :’
PARTS LIST
(RD37201 u)
Page 3
R-7H71
R-7H21
Page 4
R-7Hll
R-7HZl
.-- _I.I--I-“““UI-I.U,“.“” ...-. ,,..“..l”“......,“..........“...,,,,...~~”..., ...1. ,.. ..I. .0.11. ./ ,/,,
PRODUCT DESCRIPTION
SPECIFICATION
ITEM
Power Requirements
240 Volts
50 Hertz
DESCRIPTION
Single phase, 3 wire earthed
Power Consumption
Microwave cooking 1.3 kW
Convection cooking 1.6 kW
Power Output
700 watts nominal of RF microwave energy (2 liter water load)
Operating frequency of 2450MHz
Convection Heater Power Output
1.5kW
Case Dimensions
Width 520 mm
Height 336 mm including foot
Depth 466 mm
Cooking Cavity Dimensions
Width 340 mm
Height 215 mm
Turntable diameter
Control Complement
Set Weight
, Depth 350 mm
330mm
Touch Control System
Clock{ (I:00 - 12:59) )
Timer (0 - 99min.99 sec. )
Microwave Cooking Control
Repetition Rate;
HIGH . . . . . . . . . . . . . . . . . . . . . . . .
Full power throughout the cooking time
MED HIGH
. . . . . . . . . . . . . . . . . . ..*..*............ approx. 70% of Full Power
MED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
approx. 50% of Full Power
MED LOW, DEFROST
. . . . . . . . . . . . . . . . . approx. 30% of Full Power
LOW
. . . . . . . . . . . . . . . ..I.................
. . ..*....... approx. 10% of Full Power
Convection Temperature Control Range;
i
40 “C, 70 “C to 250 “C
SENSOR COOK pad
COMPU COOK pad
CONVECTION COOKING FUNCTION pads
NUMBER AND TEMPERATURE pads
VARIABLE COOKING CONTROL pads
STOP/CLEAR pad
ONE TOUCH REHEAT pad
EASY DEFROST pad
INSTANT COOK pad
MORE/LESS pads
AUTO START/CLOCK pad
TIMER/HOLD pad
START pad
Approx. 24 kg
,-- _ __ -_
(KU441Ul
NOTE: Numbers and letters shown after sentences such as “RD44101 U” are for factory use only.
2
Page 5
R-7Hll
R-7H21
GENERAL INFORMATION
WARNING-THIS APPLIANCE MUST BE EARTHED
IMPORTANT
The wires in this mains lead are coloured in accordance with the following code:
Green-and-yellow
: Earth
Blue
: Neutral
Brown
: Live
As the colours of the wires in the main lead of this appliance may not correspond with the coloured marking
identifying the terminals in your plug, proceed as follows:
The wire which is coloured green-and-yellow must be connected to the terminal in the plug which is marked
with the letter E or by the earth symbol
+ or coloured green or green-and-yellow.
The wire which is coloured blue must & connected to the terminal which is marked with the letter N or
coloured black.
The wire which is coloured brown must be connected to the terminal which is marked with the letter L or
coloured red.
OVEN DIAGRAM
1. Ventilation openings
6. Oven lamp
11.
Waveguide cover
2. Access cover for oven
lamp
7. Coupling
12.
Roller Stay
replacement
8. Door open button
13.
Turntable
3. Hinges
9. Touch control panel
14. Low rack
4. Safety door latches
10. Lighted Digital Display
15.
High rack
5. See through door
Page 6
R-7Hll
R-7H21
TOUCH CONTROL PANEL
R-7Hll
SENSOR COOK PAD
Touch to select sensor cook
mode
SENSOR COOK MENUS
-r
ONE TOUCH REHEAT PAD -
Touch to start automatic reheat cycle
NUMBER AND TEMPERATURE
pact
AUTO START/CLOCK PAD-----1
Touch to set clock or auto
start time
I
MORE1 A 1, LESS{ v 1 PADS
Touch to increase/decrease
the time in one minute incre-
ments during cooking or to increase/decrease the time
whilst programming the One
Touch Reheat, Sensor Cook,
Compu Cook or Easy Defrost
modes.
STOP/CLEAR PAD
Touch to erase during
programming.
Touch once to stop operation
of oven during cooking; touch
twice to cancel cooking
programme.
CONVEC I GRILL
I
SLOW _
COOK
LOW MIX
I
HIGH MIX
BAKE ROAST-
STOP
. CLEAR
lNsTANTcoDK -
START.
-COMPU COOK PAD
Touch to select Compu Cook
mode
1
COMPU COOK MENUS
-EASY DEFROST PAD
Touch to defrost meat by entering weight only
i-
CONVECTION COOKING
FUNCTION PADS
Touch to cook for each function
r
MEMORY PAD
Touch to enter one frequent-
ly used cooking programme.
Touch to recall the memorized
programme.
i-
VARIABLE COOKING CONTROL PADS
Touch to select microwave
power setting. If not touched,
HIGH is automatically selec-
ted.
- INSTANT 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
microwave, convection, grill
or mix cooking.
R-7HZl
SENSOR COOK PAD
-COMPU COOK PAD
llama-
is?- pmth”
SENSOR COOK MENUS
i
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COMPU COOK MENUS
9 tziifzz
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8ZG
I-
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0-
i
ONE TOUCH REHEAT PAD
EASY DEFROST PAD
1 CONVEC 1 GRILL 1 pg +,
NUMBER AND TEMPERATURE
PADS-,
LOW ix
I
H;GH MIX
CONVECTION COOKING
ROAST 1
FUNCTION PADS
AUTO START/CLOCK
PAD -
MORE( A 1. LESS( v
1 PADS
r
I
i
r
-
MEMORY PAD
VARIABLE COOKING CON-
TROL PADS
I+
STOP
CLEAR
lN6TAfnuxx
START
d--
INSTANT COOK/START PAD
STOP/CLEAR PAD -
I R
4
Page 7
R-7Hll
R-7H21
OPERATION
DESCRIPTION OF OPERATING SEQUENCE
The following is a description of component functions
during oven operation.
(RD71101 U)
Relay and Components Connection
RELAY
CONNECTED COMPONENTS
RYl damper motor
RY2
fan motor
RY3
convection motor
KY4
oven lamp / turntable motor
MICRO RELAY power transformer
HEATER RELAY convection heater
OFF CONDITION
Closing the door activates all door interlock switches
: Upper latch switch, lower latch switch and stop
switch (in this condiction, the monitor switch contacts are opened.)
When oven is plugged in, 240 volts A.C. is supplied
to control unit. (Figure O-l)
1. The display will show flashing ‘X8:88”.
To set any program or set the clock, you must first
touch the STOP/CLEAR pad. The display will
clear, and I:00 will appear and count up every
minute.
Note: When the door is opened, the oven lamp comes
2. A si”,“,,l is input to the control unit, energizing the
coil of shut-off relay (RYI ).
RYI contacts close, completing a circuit to the
damper motor.
The damper motor now operates moving the
damper to the open position, thereby closing the
contacts of the damper switch inputs a signal to
the control unit.
The coil of relay RYI is de-energized, opening its
contacts, thereby turning off the damper motor.
COOKING CONDITION
HIGH COOKING
Program desired cooking time and Variable Cooking
Control by touching the NUMBER pads and HIGH pad
of the Variable Cooking Control. When the START pad
is touched, the following operations occur:
1. The contacts of relays are closed and components
connected to the relays are turned on (RY2, RY4,
MICRO RELAY)
(For details, refer to Figure O-2)
2. 240 volts A.C. is supplied to the primary winding
of the power transformer and is converted to about
3.28 volts A.C. output on the filament winding, and
approximately 2125 volts A.C. on the high voltage
winding.
3. The filament winding voltage heats the magnetron
filament and the H.V. winding voltage is sent to a
voltage doubler circuit.
4. The microwave energy produced by the magnetron
is channeled through the waveguide into the cavity
feed-box, and then into the cavity where the food
is placed to be cooked.
Upon completion of the cooking time, the power
transformer, oven lamp, etc. are turned off, and the
generation of microwave energy is stopped. The
oven will revert to the OFF condition.
When the door is opened during a cook cycle, upper
latch switch, lower latch switch and stop switch are
activated with the following results. The circuits to
the turntable motor, the cooling fan motor, and the
high voltage components are deenergized, the oven
lamp remains on, and the digital readout displays
the time still remaining in the cook cycle when the
door was opened.
The monitor switch is electrically monitoring the
operation of the upper latch switch and lower latch
switch and is mechanically associated with the door
so that it will function in the following sequence.
(1)
(2)
When the door opens from a closed position,
the lower latch switch opens its contacts, and
then the monitor switch and upper latch switch
contacts close.
When the door is closed from the open position, the monitor switch and upper latch switch
contacts first open, and then the contacts of the
lower latch switch close.
if the upper latch switch and lower latch switch fail
with its contacts closed when the door is opened, the
closing of the monitor switch contacts will form a short
circuit through the’fuse, upper latch switch and lower
latch switch, causing the fuse to blow,
MED HIGH, MED, MED LOW, DEFROST, LOW
COOKING
When Variable Cooking Power is programed, the 240
volts A.C. is supplied to the power transformer
intermittently through the contacts of MICRO RELAY
which is operated by the control unit within a 32 second time base. Microwave power operation is as follows:
VARI-MODE
HIGH ’
(100% power)
MED HIGH
(approx. 70% power)
MED
(approx. 50% power)
MED LOW, DEFROST
(approx. 30% power)
LOW
(approx. 10% power)
ON TIME
OFF TIME
32 sec.
0 sec.
24 sec.
8 sec.
18 sec.
14 sec.
12 sec.
20 sec.
6 sec.
26 sec.
Note: The ON/OFF time ratio does not correspond
with the percentage of microwave power, because approx. 2 seconds are needed for heating
of the magnetron filament.
5
Page 8
R-7Hll
R-7H21
CONVECTION COOKING CONDITION
PREHEATING CONDITION (Figure O-3)
Program desired convection temperature by touching
the CONVECTION pad and the temp. pad.
When the START pad is touched, the following operations occur:
1. The coil of shut-off relays (RY2,RY3 and RY4) are
energized, the oven lamp, cooling fan motor,
turntable motor and convection motor are turned
2. y:e coil of relay (RYI) is energized by the control
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 control unit de-energizing
the relay (RYI ) and opening the circuit to the
damper motor.
3. The coil of heater relay is energized by the control
unit and the mains supply voltage is added to the
convection heater.
4. When the oven temperature reaches the selected
preheat temperature, the following operations occur:
4-1. The heater relay is de-energized by the con-
trol unit temperature circuit and thermistor,
opening the circuit to the convection heater.
4-2. the oven will continue to function for 15
minutes, turning the heater on and off, as
needed to maintain the selected preheat temperature.
The oven will shut-down completely after 15
minutes.
CONVECTION COOKING CONDITION
When the preheat temperature is reached, a beep signal
will sound indicating that the holding temperature has
been reached in the oven cavity. Open the door and
place the food to be cooked in the oven. Program desired cooking time and convection temperature by
touching the NUMBER pad, CONVECTION pad and
Temperature pad.
When the START pad is touched,
the following operation occur:
1.
2.
3.
4.
5.
The numbers of the digital readout start the count
down to zero.
The oven lamp, turntable motor, cooling fan motor
and convection motor are energized.
Heater relay is energized (if the cavity temperature
is lower than the selected temperature) and the
mains supply voltage is applied to the convection
heater to return’to the selected cooking temperature.
Upon completion of the cooking time, the audible
signal will sound, and oven lamp, turntable motor,
cooling fan motor and convection motor,
are
de-energized. At the end of the convection cycle, if
the cavity air temperature is above 118 “C, the circuit to RY2 will be maintained (by the thermistor
circuit) to continue operation of the cooling fan
motor. The cavity air temperature drops below 118
“C, at which time the relay will be de-energized,
turning off the fan motor. Relay RY3 will however,
open as soon as the convection cycle has ended,
turning off the convection fan motor.
At the end of the convection cook cycle, shut-off
relay (RYl ) is energized turning on the damper
motor. The damper is returned to the open position,
closing the damper switch contacts which send a
signal to the control unit, de-energizing shut-off
relay (RYI ) .
AUTOMATIC MIX COOKING CONDITION
Program desired cooking time and temperature by
touching the number pads and the LOW MIX/BAKE
or HIGH MIX/ROAST pad
The LOW MIX/BAKE pad is preprogrammed for 180
“C with 4 0% micro wave power, while the HIGH
MIX/ROAST pad is preprogrammed for 200 “C with
30% microwave power.
When the START pad is
touched, the following operations occur:
I. The numbers of the digital readout start the count
down to zero.
2. The shut-off relay (RY2, RY3 and RY4) are ener-
gized, turning on the oven lamp, turntable motor,
cooling fan motor and convection motor.
3. The shut-off relay (RYI ) is energized.
The damper door is closed from the open position.
4. The heater relay is energized, adding the mains
supply voltage to the convection heater.
5. Now, the oven is in the convection cooking con-
dition.
6. When the oven temperature reaches the selected
temperature, the following operations occur:
6-1. The power supply voltages is alternated to
the convection heater and power transformer.
6-2. The convection heater operates through the
heater relay contacts and the power transformer operates through the micro relay
contacts.
6-3. These are operated by the control unit to
supply alternately within a 32 second time
base, convection heat and microwave en-
ergy.
The relationship between the convection and microwave power operations are as follows.
Note: The ON and OFF time ratio does not correspond
with the percentage of microwave power, because approx. 2 seconds are needed for heating
of the magnetron filament.
YkCROWAVE KIMR
-APPtO8.10%
f
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ION
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CONVECTION
TEMPERATURE
-ECU%
6
Page 9
R-7H11
R-7H21
Note: During alternate Microwave/Convection opera-
tion, the convection heater is energized only if
the cavity temperature drops below the set temperature.
SENSOR COOKING CONDITION
Using the SENSOR COOK function, the foods are
cooked without figuring time, power level or quantity,
When the oven senses enough steam from the food, it
relays the information to its microprocessor which will
calculate the remaining cooking time and power level
needed for best results.
When the food is cooked, water vapor is developed.
The sensor “senses” the vapor and its resistance increases gradually. When the resistance reaches the
value set according to the menu, supplementary cooking is started.
The time of supplementary cooking is determined by
experiment with each food category and inputted into
the LSI.
An example of how sensor works:
I.. x.Potatoes at room temperature.
Vapor is emitted very slowly.
2.
Heat potatoes. Moisture and humidity is emitted
rapidly. You can smell the aroma as it cooks.
3. Sensor detects moisture and humidity and calculates cooking time and variable power.
Cooking Sequence.
1. Touch SENSOR COOK or ONE TOUCH REHEAT
pad.
NOTE:The oven should not be operated on SEN-
SOR COOK immediately after plugging in
the unit. Wait five minutes before cooking
on SENSOR COOK.
2. Select desired Sensor setting.
3.
4.
5.
6.
7.
Touch START pad.
The coil of shut-off relays( RY2,RY4) are energized,
the oven lamp and cooling fan motor are turned
on, but the power transformer is not turned on.
After about 16 seconds, the micro relay is energized. The power transformer is turned on, microwave energy is produced and first stage is started.
The 16 seconds is the cooling time required to remove any vapor from the oven cavity and sensor.
NOTE: During this first stage, do not open the door
or touch STOP/CLEAR pad.
When the sensor detects the vapor emitted from the
food, the display switches over to the remaining
cooking time and the timer counts down to zero.
At this time, the door may be opened to stir food,
turn it or season, etc.
When the timer reaches zero, an audible signal
sounds. The shut-off relays and micro relay are
de-energized and the power transformer, oven
lamp, etc. are turned off.
Opening the door or touching the STOP/CLEAR
pad, the time of day will reappear on the display
and the oven will revert to an OFF condition.
COMPU COOK
COMPU COOK will automatically compute the oven
temperature, microwave power and cooking time for
baking, roasting and broiling.
Set the desired program by touching the COMPU
COOK pad, and number pad.
Enter the weight by touching the Number pads
When the START pad is touched, the following operations occur:
1.
2.
3.
4.
5.
6.
The COOK indicator will light and the Convection
Fan Symbol will rotate.
The cooking time will appear on the display and
start counting down to zero.
The cooking time is adjusted automatically according to the weight of the food.
The shut-off relays (RY2, RY3, RY4 and HEATER
RELAY) are energized, turning on the oven lamp,
turntable motor, cooling fan motor and convection
motor. The power supply voltage is added to the
heating element.
Now, the oven is in the convection cooking mode.
When the oven temperature has reached the pro-
grammed convection temperature, the oven goes
into the programmed cooking mode.
At the end of the COMPU COOK cycle, the damper
is returned to the open position and the oven will
go to the off condition.
The cooling fan will remain on until the oven has
cooled.
EASY DEFROST COOKING
The EASY DEFROST key is a special function key to
defrost meats and other food faster and better.
EASY DEFROST automatically defrosts foods.
This key has 4 defrost stages.
When the food weight is entered by using the number
pads, the oven will cook according to the special
cooking sequence, refer to Easy Defrost Chart on Operation Manual.
7
Page 10
R-7Hll
R-7H21
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Page 11
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SCliEMATIC
1
NOTE: CONDlTlON OF
OVEN
1 DOOR CLOSED
2 CONVECTION PAD
TOUCIfEO
3 OESREO TEMPERATUnE
PAD TOUCttED
4 START PAD TOUCIIEO
Figure O-3. Oven
Schematic
OVEN
THERM0
CUT-OM
104’C
UPPER
LATCH
SWITCH
II}
Q-Y/l?
MBA
EARTH
OAWER MOTOR
1
MONITOR RESISTOR
0.0/2OW
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A-l
--w--s
A-S
CONTROL
UN I T
CONVECTION MOTOR
TURNTABLE MOTOR
POWER TRANSFORMER
-l I
ASYMTRIC
RECTIFIER
r -3
i-i
t!-
H.V. RECTIFIER
OVEN
THERM0
CUT-OUT
104-c
FAN
THERM0
CUT-OUT
104’C
TEMP.
FUSE
l6O’C
1 OWER
1 ATCH
SWITCH
UPPER
LATCH
SWITCH
SCHEMATIC
- -. -.-_
NOTE CONDITION OF OVEN
I
1 DOOR CLOSED
2MlX COOKING PAD TOUCHED
3 DESIRED TEMP TOUCHED
4 SrART PAD TOUCHED
_. -- - - --. .---- _ __--~_-_-_
J
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a
Q
MONITOR RESISTOR
MONITOR SWITCH
o.edow
1
A-l
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CONTROL
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HEATER RELAY
m
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FAN
THERM0
CUT-OUT
lO4’C
I
TEMP.
FUSE
16O’C
LOWER
LATCH
SW1 TCH
ASYMME
AECTIF
TRIG
IER
H.V. RECTIFIER
- Convection Cooking Conditon
mlu
Figure O-4 Oven Schematic-Automatic Mix Cooking Condition 3:
(For Australia)
I
Page 12
A-4
240V-50Hz
ill
240V550Hx
o-*/t7
b46A
EARTU
r
-NOISE SUPPRESSION COIL
- NOISE
I FILTER
I
II
I FILTER
SCHEMATIC DIAGRAM
I
I
I* 0.00228 ”
II
4
OVEN
--
CIRCUIT SUBJECT TO
CHANQE WltMWf NOTICE
OOOR CLOSED
OVEN
1
COOK OFF CONOlflON
THERUO
CUT-OUT
104-c
I.AC CORO CONNECTION
CUT-WT
104-c
FAN
lM!ERw
CUT-OUT
IM’C
TDQ.
FUSE
IW’C
BAN :
BROWN
BLU : BLUE
9-Y : QREEN AN0
YELLOW STRIPE
/I7 :
SECT 1 ONAL
AREA
OF 1.011’ MIN.
MONITOR RESISTOR
0. a/20*
I
TDP
FUSE
160-C
LOWER
LATCH
SW I TCH
OVEN LAW
m-m---+
CONTROL UN IT
I
/
,r
I
A-l
-p---pCONTROL UNIT
,
2.ORANQE WIRE UIVE)
wST DE CONNECTED
TO THE UPPER
TERMINAL OF POWER
TAAWSFORUER:
.I’
SCH~~.~ATIC
NOTE: CONOITION OF OVEN
I DOOR CLOSED
2. COOKINO TIME
PROGRAMME0
3. START PA0 TOUCHED
UPPER
LATCH
1 /
SWITCH _
1
COnVCCT ION MOTOR
n
u TWTAWF M)TOR
wrpER
LhTCti
SWITCH
SCHEMATIC
NOlE, CONOITION OF OVEN
1. DOOR CLOSED
2. CLOCK APPEARS ON
DISPLAY
--
TURNTALlLE MOTOR
9
f
L-0
-b
.-.-
‘-)
d
d
* MEATER
POWFR TbJANSFMUER
LOWER
LATCH
SWITCH
ASYMTRIC
RECTlFlER
Figure O-l. Oven Schematic - Off Conditon
Figure O-2. Oven Schematic -
Microwave Cooking Conditon
(For New Zealand)
Page 13
A
240V-50Hz
-
SCHEMATIC
NOIE CONOITION OF
OVEN
I DOOR CLOSED
2 CONVECTION PAD
TOUCl1EO
3 DESIRED TEMPERAlWE
PAD TOUCtiEO
4 Slhnl PAD TOUCIIEO
--____
OVEN
THERM0
CUT-W1
ID4’C
UPPER
LATCti
SWITCH
240V-50Hz
qpLUf 17
BRNfI7 -7
IY
I
2
FUSE
‘I}
O-Y/l7
M&A
EARTH
NOISE SUPPRESSION COIL
NOISE
I FILTER
1~“-oo22a
,I
1
‘?F
-- --
MONITOR RESISTOR
UINITOR SWITCH
A-I
--m--w
CONTROL UNIT
CONVECT I ON U)TOR
I
n
w TURMTASLE LOTOR
”
HEATER
POWER TRhNSFOR(ER
ASTUlETRfC
RECTIFIER
FAN
THERM
CUT-WT
IM’C
TEMP.
FUSE
ISO’C
LOWER
LATCH
SW I TCH
SCHEMATIC
--- ---_ ---
NOTE.CONDITION OF OVEN
1 DOOR CLOSED
2 MIX COOKING PAD TOUCHED
3 DESIRED TEMP TOUCHED
4 START PAD TOUCHED
OVEN
THERbiO
CUT-OUT
104-c
UPPER
LATCIi
SW1 TCII
O-Y/ 17
WA
EARTii
NOI
8FIL
OVEN LAMP
I
I
CONVECT 1ON MOTDR
n
L/ TURNTABLE KITOR
ASYMTRIC
RECTIFIER
SE
TER
FAN
Ttuswl
CUT-W1
IM’C
TW.
FUSE
I6O’C
I. OWER
LATCH
SWITCH
t4.V. MCTICIEll
Figure O-3 Oven Schematic
-Convection Cooking Conditon
Figure O-4 Oven Schematic-Automatic Mix Cooking Condition
(For New Zealand)
??
22
22
I
Page 14
i-7Hll
i-7H21
DESCRIPTION AND FUNCTION OF COMPONENTS
DOOR OPEN MECHANISM
The door can be opened by pushing the open button
on the control panel. When the open button is pushed,
the open lever pushes the latch lever. The latch lever
pushes lower latch head on the door upward. The
upper latch head is linked with the lower latch head,
so now, the door can be opened.
UPPER LATCH SWITCH
The upper latch switch is activated by the upper latch
head on the door.
When the door is opened, the switch interrupt the circuit to ail components, except oven lamp, fan motor,
damper motor and control unit. Then the cook cycle
is stopped.
A cook cycle cannot be take place until the door is
firmly closed and the start pad is depressed with the
cooking time set.
LOWER LATCH SWITCH
The lower latch switch is activated by the lower latch
head on the door.
When the door is opened, the switch interrupts the
circuit to the convection heater and the power transformer. Then the cook cycle is stopped.
STOP SWITCH
The stop switch is activated by the upper latch head.
When the door is opened whrle the oven is in cook
cycle, th stop switch contacts open to de-energize the
micro relay, heater relay and relays (except RYI) circuits in the control unit and causes cook time count
down to pause. MONITOR SWITCH
The monitor switch is mounted on the middle of latch
hook. It is activated (the contacts opened) by the
lower latch head when the door is closed, The switch
is intended to render the oven inoperative by means of
blowing the fuse when the contacts of the upper latch
switch and lower latch switch fail to open when the
door is opened.
Function
1.
2.
3.
When the door is opened, the monitor switch contacts close (to the ON condition) due to their being
normally closed. At this, time the upper latch
switch, lower latch switch and stop switch are in
the OFF condition (contacts open) due to their
being normally open contact switches.
As the door goes to a closed position, the monitor
switch contacts are first opened and upper latch
switch contacts are closed and then the stop
switch and the lower latch switch contacts close.
(On opening the door, each of these switches operate inversely.)
If the door is opened during cooking, and the upper
latch switch and lower latch switch contacts fail to
open, the fuse blows simultaneously with closing
of the monitor switch contacts.
CAUTION: BEFORE REPLACING A BLOWN FUSE,
TEST THE UPPER LATCH SWITCH AND
LOWER LATCH SWITCH FOR PROPER
OPERATION.
(REFER TO CHAPTER “TEST PROCEDURE”).
-
,
LATCH HOOK
LATCH LEVER
WEid WTTON
Figure D-l. Upper and lower Latch Switch,
Stop Switch and Monitor Switch
12
Page 15
R-7Hll
R-7H21
CONVECTION COOKING SYSTEM
This oven is designed with a hot air heating system
where food is not directly heated up by the convection
heater, but is instead heated by forced circulation of
the hot air produced by the convection heater.
The air heated by the convection heater is circulated
through the convection passage provided on the outer
casing of the oven cavity by means of the convection
fan which is driven by the convection motor. It then
enters the inside of the oven through the vent holes
provided on the back side of the oven. Next,the hot
air heats the food on the turntable and leaves the oven
cavity through the vent in the oven cavity rear wall.
Without leaving the oven, this hot air is reheated by the
convection heater, passes through the convection
passage and enters the inside of the oven cavity again,
in a continuing cycle.
In this way, the hot air circulates inside the oven cavity
to raise its temperature and, at the same time, comes
into contact with the food being cooked.
When the temperature inside the oven cavity reaches
the selected temperature, the convection heater is
de-energized. When the temperature inside the oven
cavity drops below the selected temperature, the convection heater is energized again. In this way, the inside of the oven cavity is maintained at approximately
the selected temperature.
When the convection time reaches “0”, the convection
heater is deenergized and the convection fan stops
operating and the oven shuts off.
At the high temperature(more then 118 “C), the fan
motor remains roataing. Automatically the fan motor
will be shut down at low temperature(less than 1 A8
“Cl
Own cavw
co NVECTION HEATER
TWlt:W*
T-SU-
Motor
Figure D-2. Convection Cooking System
The convection heater is located at the rear of the oven
cavity.
It is intended to heat air driven by the con-
vection fan.
The heated air is kept in the oven and
force-circulated and reheated by the convection heater.
THERMISTOR
The thermistor is a negative temperature coefficient
type. The temperature in the oven cavity is detected
through the resistance of the thermistor, and then the
control unit causes the heater relay to operate, thus the
current to the heating element is turned ON/OFF.
DAMPER OPEN-CLOSE MECHANISM
Usually, the damper is in the open position except
during convection cooking.
Damper position is set automatically by damper motor,
damper switch, damper cam and damper shaft.
These components are operated by a signal that judges
if microwave cooking or convection cooking operation
is selected by the control unit.
Microwave Cooking:
Damper is in the open position, because a portion of
cooling air is channeled through the cavity to remove
steam and vapors given off from the heating foods.
It is then exhausted at the top of the oven cavity into
a condensation compartment.
Convection Cooking:
Damper is in the closed position, so that no hot air will
be allowed to leak out the oven cavity.
Damper Ooeration
1.
2.
3.
When ‘power supply cord is plugged in:
l-l
1-2
1-3
1-4.
1-5.
When power &pply cord is plugged in, a signal is sensed in the control unit, and operates
shut-off relay (RYI ) a
Contacts of shut-off relay (RYI ) close, the
damper motor is energized, opening the
damper door.
When the damper is moved to the open position by the damper cam, damper switch is
closed (ON position).
The signal of damper switch is re-sensed in
the control unit and shut-off relay (RYI ) is
turned off.
The 240 volts A.C. to the damper motor is
stopped and the motor turns off.
When oven is microwave cooking:
Damper is in the open position.
When oven is convection cooking:
3-l. Damper motor is energized by touching the
convection, temperature and START pads.
3-2. When damper is in the closed position
(damper switch is OFF), its signal is sensed
by the control unit, and shut-off relay (RYI )
is de-energized.
3-3. The damper is held in the closed position
during the convection cooking operation.
3-4. At the end of the convection cooking, shut-off
relay (RYI ) is energized, and the damper is
returned to the open position.
NOTE:
If the damper is not in the proper position,
closed during convection or open during
microwave, the control unit will stop oven operation after 1 minute.
Figure D-3. Damper Mechanism
13
Page 16
R-7Hll
R-7H21
SERVICING
TROUBLESHOOTING GUIDE
When troubleshooting the oven, it is helpfull to follow
IMPORTANT: If the oven becomes inoperative be-
the Sequence of Operation in performing the checks.
Many of the possible causes of trouble will require that
a specific test be performed. These tests are given a
procedure letter which will be found in the “Test
Procedure”section.
cause of a blown fuse (M8A) in the
monitor switch , lower latch and upper
latch switches circuit, check the monitor switch, upper latch switch and
lower latch switch before replacing the
fuse.
TEST.PROCEDURE
a
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CONDITION
8
2
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Problem
1 Home fuse blows when power cord is plugged into
wall receptacle.
Fuse blows when power cord is plugged into wall
receptacle.
OFF
/ 88:88 do not appear in display when power cord is
CONDITION ’
I first plugged into wall outlet.
Display does not operate properly when STOPCLE
AR Key is touched. (Beep should sound and time
of day should appear in display.)
s
-\
b G G
G
’ Oven lamp does not light with door opened.
Oven lamp does not light in cook cycle.
(Does light when door is opened)
:OOKING
Oven lamp does not light at all.
CONDTION
Oven lamp lights, but turntable motor does not
operate.
Cooling fan motor does not operate
Oven does not go into a cook cycle when START
pad is touched.
Oven seems to be operating but little or no heat is
produced rn oven load.(Food incompletely cooked
or not cooked at all at end of cook cycle.)
-I
Oven goes into a cook cycle but extremely uneven
3
0 0
MICRO
WAVE
I
heating is produced in open loadlfood).
Oven does not cook properly when programed for
MEDIUM etc. cooking powers.(Operates properly
. on HIGH)
Oven does not cook properly when programed in
EASY DEFROST cooking mode.
CONV indicator light but oven does not go into a
cook cycle when START pad is touched.
CONV indicator lights, but heating element does
0
not heat.
Temperature in the oven cavity is lower or higher
CONVEC-
)I
than preset.
TION
I
1 Convention cycle runs 1 minute then shuts down. 1
I
I
1 Convection cycle runs 3 minutes then shuts down.
(SENSOR)
Oven is in the sensor cooking condition but AH
sensor does not end stage 1 or does not stop
cookrna cvcle or the oven stops soon.
14
Page 17
R-7H11
R-7H21
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15
Page 18
R-7Hll
R-7H21
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST -
A
MAGNETRON ASSEMBLY TEST
DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING.
To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity
check across the magnetron filament leads should indicate less than 1 ohm.
To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament
leads and chassis ground. This test should indicate an infinite resistance. If there is little or no
resistance, the magnetron is grounded and must be replaced.
Power output of the magnetron can be measured by performing a water temperature rise test.
This test should only be used if above rests do not indicate a faulty magnetron and there is no
defect in the following components or wiring: high voltage rectifier assembly, high voltage
capacitor, and power transformer.
MICROWAVE OUTPUT POWER
Microwave output power from the magnetron can be measured by way of substitution, i.e. it can
be measured by using water load how much it can be absorbed by the water load. To measure
the microwave output power in the microwave oven, the relation of calorie and watt is used.
When P(W) heating works for t(second), approximately P x t/4.2 calorie is generated. On the
other hand, if the temperature of the water with V(ml) rises AT ( “C) during this microwave
heating period, the calorie of the water is V x AT.
The formular is as follows;
P x t / 4.2 = V x AT
P (W) = 4.2 x V x AT / t
Our condition for the water ioad is as follows:
Water load . . .
2000 ml, Heating time . ..I 20 seconds
P=7Ox AT
Measuring method;
1. Put the water load of two (2) litres on the center of the oven shelf. The water load should
be arranged in two (2) Pyrex beakers, the size of which is one (I.) litre, and be placed at right
and left, side by side, on the oven shelf.
2. Measure the temperature of water before heating and also after heating during 120 seconds
by microwave, and calculate the temperature rise. The temperature rise should be the average
of temperature differences measured in each beaker.
3. The output power should be calculated as follows. In case the measuring result is not satisfactory, execute the measurement several times and judge the result from the synthetic point
of view. Microwave output power should be within f 15% of the nominal one.
Calculation of output power;
Microwave output power
. ..P(W)=7Ox AT(%)
AT = ( ATL + ATR) / 2 : average temperature rise
ATL = (TL2 - TLI), ATR = (TR2 - TRI )
TL2 : water temperature after heating in left beaker
TLI : water temperature before heating in left beaker
TR2 : water temperature after heating in right beaker
TRI : water temperature before heating in right beaker
Measuring condition;
As the microwave output is affected by several conditions, the measurement should be made
carefully with following attentions.
1. Initial temperature of salt water should be 10 +, 1 “C. Well and quickly stir the water and the
temperature measurement should be done immediately after heating.
2. The graduation of thermometer should be scaled by 0.1 “C at minimum and an accurate mer-
cury thermometer is recommended.
.= -+.
16
“_
Page 19
R-7Hll
R-7H27
TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER
COMPONENT TEST
3. Water container should be one (1) litre beaker made of Pyrex gtass and its diameter approximately 12 cm.
4. Room temperature should be around 20 “C.
5. Power supply voltage should be specification voltage.
B POWER TRANSFORMER TEST
DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING.
Disconnect the primary input terminals and measure the resistance of the transformer with an
ohmmeter. Check for continuity of the coils with an ohmmeter. On the R x 1 scale, the resistance
of the primary coil should be approx. 1.3 ohm and the resistance of the high voltage coil should
be approximately 78 ohms; the resistance of the filament coil should be less than 1 ohm.
(HIGH VOLTAGES ARE PRESENT TO HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO
MEASURE THE FILAMENT AND HIGH VOLTAGE.)
C
HIGH VOLTAGE RECTIFIER AND ASYMMETRIC RECTIFIER TEST
DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING.
HIGH VOLTAGE RECTIFIER TEST
Isolate the high voltage rectifier assembly from the circuit. Using the highest ohm scale of the
meter, read the resistance across the high voltage rectifier terminals and observe, reverse the leads
to the high voltage rectifier terminals and observe meter reading. If a short is indicated in both
directions, or if an infinite resistance is read in both directions, the high voltage rectifier is probably defective and should be replaced with rectifier.
ASYMMETRIC RECTIFIER TEST
D
Isolate the rectifier from the circuit. Using the highest ohm scale of the meter, read the resistance
across the short protector terminals, reverse the leads to the short protector terminals and observe
meter reading. If an infinite resistance is read in both directions, the rectifier is good.
If a short is indicated in either direction, the one is probably defective and should be replaced .
HIGH VOLTAGE CAPACITOR TEST
DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING.
If the capacitor is open, no high voltage will be available to the magnetron. Disconnect input
leads and check for short or open between the terminals using an ohmmeter.
Checking with a high ohm scale, if the high voltage capacitor is normal, the meter will indicate
continuity for a short time and should indicate approximately 1 OM G once the capacitor is
charged. If the above is not the case, check the capacitor with an ohmmeter to see
between either of the terminals and case. If it is shorted, replace the caoacitor.
if it is shorted
-
(RD82603LJ)
E
SWITCH TEST
Isolate the switch and check the contacts by using an ohmmeter using the following table.
If improper operation is indicated, make the necessary switch adjustment or replacement.
Table: Switch Connection
Connection
Common Terminal-Normally Open Terminal
(COW
(NOI
Common Terminal-Normally Close Terminal
Operation
(COW
(NC)
Plunger released
Open circuit
Close circuit
1
Plunger pushed
Closed circuit
Open circuit
17
Page 20
-7Hll
-7H21
TEST PROCEDURES (CONT’D)
PROCEDURE
LEl-f’ER
COMPONENT TEST
F
MONITOR SWITCH TEST
Disconnect oven from power supply. Disconnect the lead wire to the monitor switch. Connect
one ohmmeter lead to NC terminal of monitor switch, and the other lead to COM terminal of
monitor switch, as shown figure.
When the door is opened, the meter should indicate a close
circuit. When the plunger of monitor switch is pushed by a screw-driver through the latch hook
hole on the front plate of the oven cavity with the door opened, the meter should indicate an
open circuit. In case improper operation is indicated, replace the defective monitor switch.
After testing moniter switch, re-connect the wire leads to the monitor switch.
\uu aq=;-Q@-
LATCH
SWITCH
G FUSE M8A
if the fuse in the monitor switch circuit is blown when the door is opened, check the upper latch
switch, lower latch switch and monitor switch according to the Test Procedure for those
switches, before replacing the blown fuse.
If the fuse is blown by improper switch operation, replace the defective switch and fuse at the
same time.
Replace just the fuse if the switches operate normally.
CAUTION; REPLACEMENT FUSE MUST BE THE LISTED FUSE IN PARTS LIST.
OVEN THERMAL CUT-OUT TEST
I
Oven thermal cut-out is thermal cut-out. A continuity check across the thermal cut-out terminals
should indicate an closed circuit unless the temperature of the oven thermal cut-out reaches
approximately 104 “C. The thermal cut-out closes automatically at approximately 80 “C. If improper operation is indicated replace thermal cut-out.
When the oven thermal cut-out opens, it indicates overheating of the heater duct. Check the
convection motor and convection fan or check if the ventilation openings are not blocked.
MAGNETRON TEMP. FUSE TEST
J
A continuity check across the temp. fuse terminals should indicate a closed circuit.
if the temperature of the magnetron reaches 150 “C, the temp. fuse opens. If the temp. fuse has
opened, replace the fuse. An open temp. fuse indicates overheating of the magnetron assembly
Check for restricted air flow to the magnetron through the opening in the chassis especially the
fan duct. Or an open temp. fuse indicates stop of fan motor. Check for fan motor.’
FAN THERMAL CUT-OUT TEST
Fan thermal cut-out is thermal cut-out. A continuity check across the thermal cut-out terminals
should indicate an closed circuit unless the temperature of the thermal cut-out reaches approximately 104 “C. The thermal cut-out closes automatically at approximately 80 “C. If improper
operation is indicated replace thermal cut-out.
When the fan thermal cut-out opens, it indicates overheating of the cooling fan motor. Check the
cooling fan motor or check if the ventilation openings are not blocked.
18
Page 21
R-7Hl f
R-7H21
TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER
COMPONENT TEST
CONVECTION HEATER TEST
Make sure the convection heater is fully cooled and test as follows;
a. Disconnect wire leads and measure the resistance with an ohmmeter. On the R x 1 scale, the
resistance between the heating element terminals should be as followings.
Convection Heater: 380hms
b. Disconnect wire leads and measure the insulation resistance with 500V - 1 OOM Q insulation
resistance meter. The insulation resistance between convection heater terminal and cavity
should be more than IOM C.
THERMISTOR TEST
Disconnect connector-E from the CPU unit. Measure the resistance of the thermistor with an
ohmmeter. Connect the ohmmeter leads to Pin No’s E-4 and E-5.
Room Temp.
Resistance
1 68 “F(20 “C) - 86 “F(30 “C) Approx. 350k Q - 155k II 1
If the meter does not indicate above resistance, replace the thermistor.
M
MICRO RELAY AND HEATER RELAY TEST
Disconnect the wire leads from relay terminals (l),(3), (5) and (6).
CONTACTS:
With 12 volts D.C. applied to the surge relay coil (1) and (6), a check
of contact with an ohmmeter should indicated (3) and (5) contacts are
closed.
Without 12 volts D.C. applied to the relay coil (1) and (6), an ohmmeter
should indicate those contacts are opened. If improper operation is
indicated, replace the relay. If proper operation is indicated, check for
loose on broken wire connections.
3
I
FliB
5
1
CAL
6
COIL:
A continuity check of the relay coil should indicate approximately 160 R. If the motor does not
imdicate above ohms, replace the relay.
N
NOISE FILTER TEST (NEW ZEALAND MODEL R-7Hll ONLY)
Disconnect the oven from the power
supply. Disconnect the wire leads to the
noise filter. Connect the ohmmeter leads
between the terminal No.1 and No.2, or
No.3 and No.4, or No.1 and No.3, or No.2
and No.4 of the noise filter. And then
measure the each resistance.
MEASURING POINTS
INDICATION OF OHMMETER
Between the terminal No.1 and 2.
Approximately 470k fI
Between the terminal No.3 and 4.
Approximately 470k R
Between the terminal No.1 and 3.
Short
Between the terminal No.2 and 4.
Short
If the ohmmeter does not indicate above resistance, replace the noise filter unit. After testing the
noise filter, re-connect the wire leads to the noise filter correctly according to the pictorial diagram.
79
Page 22
R-7Hll
R-7H21
TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER
COMPONENT TEST
0
CHOKE COIL ASS’Y TEST (NEW ZEALAND MODEL R-7Hll ONLY)
Disconnect the oven from the power supply.
Disconnect the terminal of the choke coil assembly to the magnetron. Connect the ohmmeter
leads to the terminals of the choke coil assembly. And measure the each resistance.
If a short is indicated, the choke coil assembry is good.
But if an open is indicated, it is defective and should be replaced.
After testing the choke coil assembly, re-connect the terminal of the choke coil assembly to the
magnetron.
RELAY TEST
Remove the outer case and check voltage between Pin Nos. 1 and 3 of the 3-pin connector (A)
on the control unit with an A.C. voltmeter.
The meter should indicate 240 volts, if not check oven circuit.
Shut-off,Micro and Heater Relay Test
These relays are operated by D.C. voltage.
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking or convection
cooking operation.
DC. voltage indicated . . . . . . . . . . Defective
relay.
DC. voltage not indicated . . . . . . ..Check diode which is connected to the relay coil. If diode is
good, control unit is defective.
Q
RELAY SYMBOL j OPERATIONAL
/ CONNECTED COMPONENTS
I
VOLTAGE /
RYI / Approx. 12 V.D.C. / Damper motor
RY2 / Approx. 12 V. D.C. / Cooling fan motor
RY3 Approx. 12 V.D.C. Convection motor
RY4 Approx. 12 V. D. C. Turntable motor and Oven lamp
MICRO RELAY
1 Approx. 12 V.D.C. 1 Power transformer
HEATER RELAY j Approx. 12 V.D.C. / Heating element
TOUCH CONTROL PANEL ASSEMBLY TEST
(RD82R08U)
The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc.
Therefore, unlike conventional microwave ovens, proper maintenance cannot be performed with
only a voltmeter and ohmmeter. In this service manual, the touch control panel assembly is divided into two units, Control Unit and Key Unit ,
scribed according to the symptoms indicated.
troubleshooting by unit replacement is de-
I. Key Unit.
The following symptoms indicate a defective key unit. Replace the key unit.
a) When touching the pads, a certain pad produces no signal at all.
b) When touching a number pad, two figures or more are displayed.
c) When touching the pads, sometimes a pad produces no signal.
2. Control Unit
The following symptoms indicate a defective control unit. Replace the control unit.
2-l Programming problems.
a) When touching the pads, a certain group of pads do not produce a signal.
2-2 Display problems.
a) For a certain digit, all or some segments do not light up.
b) For a certain digit, brightness is low.
c) Only one indicator does not light up.
d) The corresponding segments of all digits do not light up; or they continue to light up.
e) Wrong figure appears.
f) A certain group of indicators do not light up.
g) The figure of all digits flicker.
2-3 Other possible problems caused by defective control
a)
Buzzer does not sound or continues to sound.
unit.
b) Clock does not operate properly.
c) Cooking is not possible.
20
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R-7H21
TEST PROCEDURES (CONT’D)
PROCEDURE
LEITER
COMPONENT TEST
d) Proper temperature measurement is not obtained.
Note: When defective components,(the Control Unit or Key Unit) are replaced, the defective part
or parts must be properly packed for return in the shipping carton, with its cushion material, in which the new replacement part was shipped to you.
(RD82S01 U)
R AH SENSOR TEST
Checking the initial sensor cooking condition
(I) The oven should be plugged in at least five minutes before sensor cooking.
(2) Room temperature should not exceed 95 “F(35 “C).
(3) The unit should not be installed in any area where heat and steam are generated. The unit
should not be installed, for example, next to a conventional surface unit. Refer to the
“INSTALLATION Instructions”.
(4) Exhaust vents are provided on the back of the unit for proper cooling and air flow in the
cavity.To permit adequate ventilation, be sure to install so as not to block these vents.
There should be some space for air circulation.
(5) Be sure the exterior of the cooking container and the interior of the oven are dry. Wipe off
any moisture with a dry cloth or paper towel.
(6) The Sensor works with food at normal storage temperature.For example, chicken pieces
would be at refrigerator temperature and canned soup at room temperature.
(7) Avoid using aerosol sprays or cleaning solvents near the oven while using Sensor settings,
The sensor will detect the vapor given of by the spray and turn off before food is properly
cooked.
(8) After 30 minutes if the sensor has not detected the vapor of the food, ERROR will appear
and the oven will shut off.
Water load cooking test
Make sure the oven has been plugged in at least five minutes before checking sensor cook op-
eration. The cabinet should be installed and screws tightened.
(I ) Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup.
(2) Place the container on the center of tray in the oven cavity.
(3) Close the door.
(4) Touch SENSOR COOK pad and number pad 9. Now, the oven is in the sensor cooking
condition and SC-9 will appear in the display.
(5) Touch Start pad.The oven will operate for the first 16 seconds, without generating micro-
wave energy.
NOTE: ERROR will appear if the door is opend or STOP/CLEAR pad is touched during first
stage of sensor cooking.
(6) After approximately 16 seconds, microwave energy is produced, oven should turn off when
water is boiling (bubling).
If the oven does not turn off, replace the AH sensor or check the control unit, refer to explanation below:
21
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TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER
COMPONENT TEST
TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNIT
To determine if the sensor is defective, the simpiest method is to replace it with a new replacement sensor.
(1) Disconnect oven from power supply and remove outer case.
(2) Discharge the high voltage capacitor.
(3) Remove the AH sensor.
(4) Install the new AH sensor.
(5) Re-install the outer case.
(6) Reconnect the oven to the power supply and check the sensor cook operation proceed as
follows:
6-1. Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring
cup.
6-2. Place the container on the center of tray in the oven cavity.
6-3. Close the door.
6-4. Touch SENSOR COOK pad and number 9 pad.
6-5. Touch Start pad. The control panel is in automatic Sensor operation.
6-6. The oven will turn off automatically when the water is boiling (bubling).
If new sensor dose not operate properly, the problem is with the control unit.
CHECKING CONTROL UNIT
(1) Disconnect oven from power supply and remove outer case.
(2) Discharge the high voltage capacitor.
(3) Disconnect the wire leads from the cook relay.
(4) Disconnect the sensor connector.
(5) Then connect the dummy resistor circuit (see fig.) to the sensor connector of control panel.
(6) Reconnect the oven to the power supply and check the sensor cook operation proceed as
follows:
6-l. Touch SENSOR COOK pad and number 9 pad.
6-2. The control panel is in the sensor cooking operation.
6-3. After approximately 20 seconds, push plunger of select switch.
This condition is same as judgement by AH sensor.
6-4. After approximately 3 seconds, cooking operation turns off, an audible signal will
sound, and the display will then revert to the time of day.
Plunger
If the above is not the case, the control unit is probably defective.
If the above is proper, the AH sensor is probably defective.
To Connector (F)
on Control Unit
CONNECTOR
P-J
D
NC
NO
COM
Rl, R2 lOCS1 r 1% li2W
F-l -
R3 1okil t 596
7i4w F-2-
R4
12kR : 5%
1,‘4w
F-3 a---
Sensor Dummy Registor Circuit
(RD82Q09U)
22
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R-7H21
TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER
COMPONENT TEST
S
PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING
BOARD (PWB) IS OPEN.
To protect the electronic circuits, this model is provided with a fine foil pattern added to the
primary on the PWB, this foil pattern acts as a fuse. If the foil pattern is open, follow the troubleshooting guide given below for repair.
Problem: POWER ON, indicator does not light up.
~TEPS (
OCCURANCE
I
CAUSE OR CORRECTION
1’ I
The rated voltage is not applied to POWER terminal / Check supply voltage and oven power cord.
/
/of CPU connector (CN-A)
I *
The rated voltage is applied to primary side of power ’ Power transformer or secondary circuit defective.
transformer.
j 3
1 Check and repair.
,
Only pattern at “a” is broken. 1 “Insert jumper wire 1 and solder.
I
4
1 Pattern at “a” and “b” are broken.
I
1 ‘Insert the coil RFILNA003DREO between “c” and /
I “d”.
NOTE:* At the time of these repairs, make a visual in-
spection of the varistor for burn damage and
test the transformer with an ohmmeter for the
presence of layer short-circuit (check primary
coil resistance).
If any abnormal condition is detected, replace
the defective parts.
(RD8
23
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R-7H21
TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
The touch control section consists of the following units as
shown in the touch control panel circuit.
(1) Key unit
(2) Control unit
The principal functions of these units and signal communicated among them are explained below.
Key Unit
The key unit is composed of a matrix, signals generated in
the LSI are sent to the key unit through PO1 - PW, PC%
PO6,PlO,P26 and P27.
When a key pad is touched, a signal is completed through the
key unit and passed back to the LSI through RO - R3 to
perform the function that was requested.
Control Unit
Control unit consists of LSI ()ZA226DP),
power source
circuit,
synchronizing signal circuit, ACL circuit, buzzer
circuit, temperature measurement circuit, indicator circuit and
absolute humidity sensor circuit.
1) LSI
This LSI controls the temperature measurement signal,
key strobe signal relay driving signal for oven function
and indicator signal.
2) Power Source Circuit
This circuit generates voltages [VC: -5V. VFl: -23V,
VF2: -26V, VA: -15V and Vp: -3lV] necessary in the
control unit.
3) Synchronizing Signal Circuit
The power source synchronizing signal is available in order
to compose a basic standard time in the c!ock circuit.
It accompanies a very small error because it works on
commercial frequency.
4) ACL Circuit
A circuit to generate signals resetting the LSI to the initial
state when power is supplied.
5) Buzzer Circuit
The buzzer is responsive to signals from the LSI to emit
noticing sounds (key touch sound and completion sound).
6) Temperature Measurement Circuit [ 11 : Oven
The temperature in the oven cavity is sensed by the thermistor.
The variation of resistance according to sensed temperature is
detected by the temperature measurement circuit and
the result applied to LSI.
The result of detecting is given to LSI controlling the relay
and display.
7) Door Switch (Stop switch)
A switch to “tell” the LSI if the door is open or closed.
8) Relay Circuit
To drive the megnetron, heating element, grill heating
element, fan motor, convection motor, damper motor
and light the oven lamp.
9) Indicator Circuit
Indicator element is a Fluorescent Display.
Basically, a Fluorescent Display is triode having a cathode,
a grid and an anode. Usually, the cathode of a Fluorescent
Display is directly heated and the filament serves
as cathode. The Fluorescent Display has g-digits, 15-segments.
10) Absolute Humidity Sensor Circuit
The circuit detects absolute humidity of a food which is
under cooking, to allow its automatic cooking.
24
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R-7H21
DESCRIPTION OF LSI
LS i WA225DR)
The I/O signal of the LSI
(IZA225DR)
is detailed in the following table.
Pin. No.
Signal
I/O
Description
1 VREF
IN
Reference voltage input terminal.
A reference voltage applied to the A/D converter in the LSI.
Connected to GND. (OV)
2
IN7
IN
Terminal to change functions according to the model.
Signal in accordance with the model in operation is applied to set up its function.
3
IN6 IN
Terminal for manufacture test.
Connected to VC I--5V).
4
IN5
IN
5 IN4 IN
6
IN3 ’ IN
Heating constant compensation terminal.
Input signal which communicates the damper open/close information to LSI.
Damper opened (Damper switch ON); “H”level signal (OV: GND)
Damper closed (Damper switch OFF); “L”level signal (- 5V: VC)
Terminal not used. Connected to GND.
7 IN2
I
IN ’ Temperature measurement input: OVEN THERMISTOR.
By inputting DC voltage corresponding to the temperature detected by the thermistor,
this input is converted into temperature by the A/D converter built into the LSI.
8 IN1 IN
AH sensor input
This input is an analog input terminal from the AH sensor circuit, and connected to the
A/D converter built into the LSI.
9 IN0 IN
Used for initial balancing of the bridge circuit (absolute humidity sensor).
This input is an andOg input terminal from the AH sensor circuit, and connected to the
A/D converter built into the LSI.
10
P47
OUT
71
P46 OUT
12
P45 OUT
13
P44
OUT
14
P43
OUT
15
P42
OUT
Used for initial balancing of the bridge circuit(absolute humidity sensor).
Timing signal output terminal for temperature measurement (OVEN).
“H” level (GND) : Temperature measuring timing. (convection and grillcooking).
“L” level (-5V) : Thermistor OPEN timing.
25
Page 28
Pin No.
16
I
I
i
17
18
19
20
21
Signal
P41
P40
P37
P36
P35
P34
I/O
OUT
OUT
OUT
OUT
OUT Heating element driving signal.
To turn on and off the heater relay.
“L” level during convection cooking; “H” level otherwise.
During convection cooking, the signal becomes
“H” level when the temperature of
oven cavity exceeds the predetermined temperature.
OUT
Oven lamp and turntable motor driving signal (Square waveform: 50l-W
To turn on and off shut-off relay (RY4).
The square waveform voltage is delivered to the RY4 driving circuit and relays (RY3,
COOK RELAY and HEATER RELAY) control circuit.
Description
Terminal not used.
Cooling fan motor driving signal.
To turn on and off shut-off relay (RY2).
“L” level during both microwave and con-
vection cooking; “H” level otherwise.
1
OFF
H GND
DUIlng
ON.
cooking
-----L
Convection motor driving signal.
To turn on and off shut-off relay (RY3). “L” levei during convection; “H” level
otherwise.
Terminal not used
the
20 msec
*
---
7
- *
--a---H
L
+
Ulll ‘“9 rrrok llrg
26
Page 29
Pin No. Signal
22
P33
23
P32
24
P31
25
26
27
P30
CNVSS
RESET
l/O
OUT
OUT
IN
OUT
IN
IN
Description
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay
In High operation, the signals holds “L” level during microwave cooking and “H” level
while not cooking.
In other cooking modes (MED HIGH, MED, MED LOW, LOW) the
signal turns to
“H” level and “L” level in repetition according to the power level.
1
ON
HIGH
,
,
-Gl
MED HIGH -
a ICC
OFF I
MED
M&-D L&J”.-:;$iE~
-ON .
, H GND
LOW
26 rec.
-I d
6sec
OFF
-L
32 rec.
k 4
Signal to sound buzzer.
A : Key touch sound.
B : Completion sound.
C : When the temperature of the oven cavity reaches the preset temperature in the pre-
heating mode, or when the preheating hold time (15 minutes) is elapsed.
0.12 set
H GND
Signal synchronized with commercial power source frequency.
This is the basic timing for all time processing of LSI.
Damper motor relay driving signal.
To turn on and off the shut-off relay (RYl).
Connected to VC.
Auto-clear terminal.
Signal is input to reset the LSI to the initial state when power is supplied.
Temporarily set to
“L” level the moment power is supplied, at this time the LSI is reset.
Thereafter set at “H” level.
R-7H11
R-7H21
1
27
Page 30
Pin No.
Signal l/O
Description
28
IN
XIN
XOUT
Internal clock oscillation frequency setting input.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XOUT terminal.
?
OUT
29
30
Internal clock oscillation frequency. control output.
Output to control oscillation input of XIN.
XCIN Terminal not used.
31 XCOUT
32 vss IN Power source voltage: -5V.
VC voltage of power source circuit input.
33
Q,
OUT
Terminal not used.
34
R3
IN
Signal coming from touch-key.
When either one of G-l line keys on key matrix is touched, a corresponding signal out of
PO1 -PO3,PO5,PO6,PlO,P26, and P27 will be input into R3.
When no key is touched, the signal is held at “L” level.
I
i
I
T
T
35 R2 IN
Signal similar to R3.
When either one of G-2 line keys on key matrix is touched, a corresponding signal will
be input into R2.
36 Rl IN
Signal similar to R3.
When either one of G-3 line keys on key matrix is touched, a corresponding signal will
be input into Rl.
RO
37
38
IN
Signal similar to R3.
When either one of G-4 line keys on key matrix is touched, a corresponding signal will
be input into RO.
VP
IN
1 Anode (segment) of Fluorescent Display light-up voltage: - 31 V.
1 VP voltage of power source circuit input.
39
P17 OUT Segment data signals.
/
The relation between signals and indicators are as follows:
Signal
Segment
PI7
................
.L52
P15
................
.U52
P14
................
.LBl
P12
................
.UBl
Pll
................
.K
PlO
................
.J
PO6
................
.i
PO5
................
.h
Signal
Segment
PO3
...............
g
PO2
...............
f
PO1
...............
e
P27
...............
d
P26
...............
c
P24
...............
b
P23
...............
a
,x mz~l
J-L
J---L~-I:I:“o.
-3lV
--
28
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R-7Hll
R-7H21
Pin No.
Signal i/O
Description
40
P16
OUT
Digit selection signal.
The relation between digit signal and digit are as follows:
Digit signal
digit Digit signal
digit
P16 . . . . . . . . . . . . . . . . .lst
PO4 . . , . . . . , . . . . . . . .4th
P13 . . . . . . . . . . . . . . . , .2nd
PO0 . . . . . . . . , . . . . . . -5th
PO7 . . . . . . . . . . . . . . . . .3rd
P25 . . . . , . . . . . . . . . . .6th
Normally, one pulse is output in every I3 period, and input to the grid of the Fluorescent
Display.
- ---”
II (SOHZI
-- c
--- - -- .----- -- -_ GND
P16
-31”
PI3
-Up
’ PO7
PM
PO0
41
42
43
P25
-l--LIT z
P15 /
OUT
Segment data signal.
b Signal similar to P17.
P14 OUT
P13 ’
OUT
Digit selection signal.
Signal similar to P16.
44
P12
45
Pl 1
46
PlO
OUT
OUT
Segment data signal.
Signal similar to P17.
1) Segment data signal.
Signal similar to P17.
2) Key strobe signal.
Signal applied to touch-key section.
Apulse signal is input to RO -
R3 terminal while one of G-5 line keys on key matrix
is touched.
47
PO7 OUT
Digit selection signal.
Signal similar to P16.
48
PO6 OUT
1) Segment data signal.
Signal similar to Pl7.
I 2) Key strobe signal.
Signal applied to touch-key section.
A pulse signal is input to RO -R3 terminal while one of G-6 line keys on key matrix
is touched.
49
PO5
I I
OUT
1) Segment data signal.
Signal similar to P17.
2) Key strobe signal.
/
Signal applied to touch-key section.
I
!
A pulse signal is input to RO- R3 terminal while one of G- 7 line keys on key matrix
is touched.
--
I
29
Page 32
7Hll
-7H21
I
51 PO3
OUT /
1) Segment data signal.
I
I
Signal similar to P17.
52 PO2
T
I
I PO0
54 I
----T--
55 j
P27
,
I
I
I
56
P26
I
I
I
,
/
1 57
P25
; 58 ’
P24
59 I
P23
I
j 60 :
P22
/ 61 1 P21
I
I
I
/ 62 j
P20
I
I
I
I
I
j 63
I
I
i AVCC
64 1
vss
I
I- ---I
1
/
/
/
!
I
I
I
1
I
t
i
-
t
-t
I
i
I
2) Key strobe signal.
Signal applied to touch-key section.
OUT
A pulse signal is input to RO - R3 terminal while one of G-l 1 line keys on key
matrix is touched.
--
1) Segment d8t8 signal.
Signal similar to P17.
2) Key strobe signel.
Signal applied to touch-key section.
A pulse signal is input to RO- R3 terminal while one of G-l 1 line keys on key
matrix is touched.
OUT !
Digit selection signal.
: Signal similar to P16.
OUT / Segment data signal.
Signal simiiar to P17.
OUT
1 Terminal not used.
-7
OUT j
Terminal not used.
IN
1 Input signal which communicates the door open/ciose information to LSI.
Door closed;
“f-i” level signal (OV)
Door opened;
“L” level signal (-5V)
Connected to GND.
+--I-
Connected to GND.
i
I/O )
OUT 1 Digit selection signal.
/
I Signal similar to P16.
Description
I
1 2) Key strobe signal.
Signal applied to touch-key section.
A pulse signal is input to RO - R3 terminal while one of G-8 line keys on key matrix
is touched.
OUT
/ 1) Segment data signal.
/
Signal similar to P17.
2) Key strobe signal.
Signal applied to touch-key section.
h
A pulse signal is input to RO - R3 terminal while one of G-9 line keys on key matrix
I
is touched.
OUT
/ 1) Segment data signal.
I
I
Signal similar to P17.
/ 2) Key strobe signal.
I
Signal applied to touch-key section.
A pulse signal is input to RO - R3 terminal while one of G-10 line keys on key matrix
is touched.
OUT ’
Digit selection signal.
’ Signal similar to P16.
’ 1) Segment data singal.
OUT I
1
Signal similar to P17.
~--
I
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R-7H21
ABSOLUTE HUMIDITY SENSOR CIRCUIT
(1) Structure of Absolute Humidity Sensor
The absolute humidrty sensor includes two thermistors as
shown In the illustratron. One thermrstor is housed in the
closed vessel filled wrth dry air while another in the open
vessel. Each sensor is provided wrth the protective cover made
of metal mesh to be protected from the external aIrflow
Figure T-l.
(2) Operational Principle of Absolute Humidity Sensor
The ftgure below shows the basic structure of an absolute
humldlty sensor
A bridge crrcurt IS
formed by two ther-
mistors and two resistors (Rl and R2).
The output of the brtdge clrcurt IS to be amplified by the
operational amplrfler.
Each thermrstor IS suppiled with a current to. keep itself
heated at about 150°C (302°F) and the resultant heat 1s
drsslpated In the air ‘and If the two thermistors are placed In
different humrdlty condltrons they show different degrees of
heat conductlvlty
leadrng to potentrat dtfference between
them causing an output voltage from the bridge circuit, the
lntensrty of whch IS Increased as the absolute humldlty of the
air increases.
Since the output IS very minute, It ~111 be
amplrfled by the operattonal ampltfier.
outour voltage characrergsrtc
~~~~~~~ ~~‘lY ,‘l
I
w
Absolute humtdlry (g/m’ I
Figure T-2.
(3) Detector Circuit of Absolute Humidity Sensor
This detector circuit is used to detect the output voltage of
the absolute humidity circuit to allow the LSI to control the
sensor cooking of the unit.
When the unit is set in the Sensor Cooking mode, 16 seconds
later the detector circuit starts to function and the LSI
observes the initial voltage available at its IN1 terminal. With
this voltage given, the switches SW1 to SW5 in the LSI are
turned on in such a way as to change the resistance values in
parallel with R50-1. Changing the resistance values results in
that there is the same potential at troth F-3 terminal of the
absolute humidity sensor and IN0 terminal of the LSI. The
voltage of IN1 terminal will be indicate about -2.5V. This
initial balancing is set up about 16 seconds after the unit is
put in the Sensor Cooking mode.
As the sensor cooking proceeds, the food is heated to generate
moisture by which the resistance balance of the bridge circuit
is deviated to increase the voltage available at IN1 terminal of
the LSI. Then the LSI observes that voltage at IN 1 terminal’
and compares it with its initial value, and when the comparison rate reaches the preset value (fixed for each menu to
be cooked), the LSI causes the unit to stop the sensor cooking;
thereafter, the unit gets in the next necessary operation automatically.
When the LSI starts to detect the initial voltage at IN1
terminal 16 seconds after the unit has been put in the Sensor
Cooking mode, if it is impossible to take a balance of the
bridge circuit due to disconnection of the absolute humidity
sensor, ERROR will reappear on the display and the cooking is
stopped.
1) Absolute humidity sensor circuit
R%: - l S.ck
po-4,
1
I
0
..FWH R
SW1
10
P47d
11
-O--L
P46/
12
sw3yl
13
C TturmWcw tn 1
14
01 0.d “.W. I
0
--A*
I
P43---59
*
S Ttwm~,tor ,n
own “....I
t
RIM
VA: -15V
Figure T-3.
2) Internal equivalent circuit of I2
Top View
I
Figure T-4.
37
Page 34
SERVICING
1.
Precautions for Handling Electronic Components
Thrs unrt uses PMOS LSI In the Integral part of the circuits
When handlrng these parts, the followlng precautions should
be strictly followed.
PMOS LSI have extremely high Impedance at its Input and
output termrnals. For this reason, It IS easily Influenced by
rhe surrounding high voltage power source, static electric-
-tty charged In clothes, etc, and sometlmes It IS not fully protected by the built-In protectlon clrcutt.
1) When storing and transporting, thoroughiy wrap them
in alumlnum foil.
Also wrap PW boards contarnlng them In alumlnum foil
2) When soldering, ground the technician as shown in the
figure and use grounded soldering Iron and work table
2. Shapes of Electronic Components
Trarlslsto:
Transistor
2s B793
DTD143EA
Transistor
DTAI 43ES
DTAll4Y.S
DTCll4ES
DTB143ES
3. Servicing of Touch Control Panel
We describe the procedures to permit servrctng the touch
control panel of the mtcrow
must consider when doing
ave oven and the cau
so.
Ions you
To carry the servlclng, power supply to the touch control
panel IS avarlable either from the power line of the oven
proper Itself of from an external power source.
(1) Servicing the touch control panel with power supply
from the oven proper:
CAUTION:
THE HIGH VOLTAGE TRANSFORMER OF THE
MICROWAVE OVEN IS STILL ALIVE TO GIVE YOU
DANGER DURING SERVICING.
ITherefore, when checking the performance of the touch
control panel, put the outer cabinet on the oven proper
to keep you from touching the high tenston transform-
er, or unplug the pnmary terminal (connector) of the high
power transformer to turn it off; and the end of such
connector shall be Insulated with an lnsulatmg tape. After servlclng. be sure to replace the leads to their orlglnal locaflons
A. On some models, the power supply cord between the
touch control panel and the oven proper IS so short that
they can’t be separated from each other.
For those models, therefore, check and repalr. all the controls (with the sensor-related ones Included) of the touch
control panel while keeping It In contact with the oven
proper.
B On some models, on the other hand, the power supply
cord between the touch control panel and the oven
proper IS so long that they may be separated from each
other. For those models, therefore, It IS allowed to check
and repalr the controls of the touch control panel while
keeping It apart from the oven proper; In this case you
must short both ends of the door sensing (on PWBj of
the touch control panel wrth a jumper, which brings
about ar! operational state that IS equtvalent to that with
the oven door being closed.
As to the sensor-related controls of the touch control
panel, their checking IS allowed If the dummy resIstor
whose resrstance IS equal to that of those controls IS
used
(2) Servicing the touch control panel with power supply
from an external power source:
Disconnect rhe touch control panel completely from the
.oven proper, and short both ends of the door sensing
switch (on PWB) of the touch control panel, which
brings about such an operational
state that is
equivalent to that with the oven door being closed.
And connect an external power source to the power
input terminal of the touch control panel, and then it
is allowed to check and repair the controls of the
touch control panel; as in the case of (11-B above, it
is here also possible to check the sensor-related
controls of the touch control panel by using the
dummy resistor(s).
4 Sevicing Tools
Tools required when se:vlclng the touch control panel as
sembly
1) Soldering 30W
(To prevent leaking current, It IS recommended to use
a soldering Iron with groundlng terminal )
2) Oscilloscope: Single beam, frequency range. DC 10MHz type or more advanced model
3) Others:
Hand tools
5. Other Precautions
1)
2)
3)
4)
51
When turning on the power source of the control unrt,
remove the aluminum for1 applied for preventing static
electricity.
Connect the connectors of the Indicator and key units
to the control unrt taking care that the lead wires are
not twisted.
After aiumlnum foil IS removed, take extra care that abnormal voltage due to static electrlclty etc IS not applied to the Input or output termmals.
Attach connectors, electrolytic capacitors, etc to PW
board, taking care that all connectlons are tight
Be sure to use speclfled components where high nrecl
slur\ IS requtred
32
Page 35
R-7Hl ‘I
R-7H21
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
WARNING: To avoid, possible exposure to microwave
energy;
A. Before operating the oven
1. Make sure that, when unlatching the door
slowly, an accompanying “click” indicating the
actuation of the monitor switch and latch
switches is heard.
2. Check visually the door seal for arcing and
damage.
B. Do not operate the oven before any of the follow-
ing conditions are repaired;
1. Door does not close firmly against the front of
appliance.
2. There are a broken door hinge or support.
3. The door is bent or warped.
4. There is any defective parts in the interlock,
oven door or microwave generating and transmission assembly.
5. There is any other visible damage to the oven.
C. Do not operate the oven
I. Without the RF gasket.
2. If the door is not closed.
CAUTION: DISCONNECT OVEN FROM POWER
SUPPLY BEFORE REMOVING
OUTER CASE. DISCHARGE HIGH
VO LTAG E
CAPACITOR BEFORE
TOUCHING ANY OVEN COMPO-
NENTS OR WIRING.
(RDA1203U)
OUTER CASE CABINET REMOVAL
To remove the outer case and proceed as follows;
1. Disconnect oven from power suppply.
2. Remove eight (8) screws from the rear and along
the side edge of the case.
3. Remove two (2) screws (LHSTIX LR-4) from the
lower portion of the oven cabinet back side.
4. Slide the entire case back about 3cm to free it from
retaining clip on the cavity face plate.
5. Lift the entire case from the unit.
IJ-kTlX SCREW DRIVER
LklX SCREW
(SIZE LR-4)
LISTIX SCREW DRIVER AND LHSTIX SCREW
CAUTION: DISCHARGE THE HOGH VALTAGE
CAPACITOR BEFORE TOUCHING
ANY OVEN COMPONENTS OR WIRING.
NOTE: THE OUTER CASE CABINET IS SECURED BY
SPECIAL (LH) SCREWS. WHEN SECURING
OR LOOSING THE SCREW, LHSTIX (LR-4)
TYPE SCREW DRIVER SHOULD BE USED.
\d
0
I
0
,g-ama
---.
REMOVAL OF LHSTIX SCREW AT OVEN BACK
SIDE.
33
Page 36
L7Hll
t-7H21
POWER TRANSFORMER REMOVAL
1.
2.
3.
4.
5.
5.
6.
Disconnect oven from power supply and remove
outer case.
3
Discharge high voltage capacitor.
4,
Disconnect filament leads of the transformer from
the magnetron and capacitor.
Disconnect high voltage lead of capacitor from the
transformer.
5.
Disconnect wire leads from the transformer.
Remove two (2) screws and one (1) washer hold-
ing the transformer to the cabinet base.
Remove the transformer.
G
Re-install
VI
1.
2.
1.
2.
3.
4.
1.
Z:
4.
1.
2.
3.
4.
5.
6.
Rest the transformer on the base cabinet with its
Make sure the transformer is mounted correctly
to the corners underneath those tabs.
After re-installing the transformer, secure the
transformer with two (2) screws to the cabinet
base, one is with outertooth washer and the
other is without outer-tooth washer.
Re-connect the wire leads (primary and high
voltage) and high voltage lead to the transformer
and filament leads of transformer to the
magnetron and capacitor, referring to the “Pictorial Diagram”.
Re-install the outer case and check that the oven
is operating properly.
primary terminals toward the front.
Insert the two edges of the transformer into two
metal tabs of the base cabinet.
NOTE: ORANGE WIRE (LIVE) MUST BE CON-
NECTED TO THE UPPER TERMINAL OF
POWER TRANSFORMER.
ASYMMETRIC RECTIFIER AND H.V.RECTIFIER ASS’Y REMOVAL
Disconnect oven from power suppply and remove
CAUTION: WHEN REPLACING THE RECTIFIER
outer case.
ASSEMBLY, THE GROUND SIDE
Discharge the high voltage capacitor.
TERMINAL MUST BE SECURED
Remove one (1) screw holding the H.V. rectifier FIRMLY WITH A GROUNDING
terminal to the capacitor holder.
SCREW.
Disconnect
the rectifier assembly from the
capacitor.
HIGH VOLTAGE CAPACITOR REMOVAL
Disconnect oven from power supply and remove 5. Disconnect high voltage wire lead of capacitor from
outer case.
transformer.
Discharge the high voltage capacitor.
Disconnect the high voltage wire leads and rectifier
6. Remove one (1) screw and washer holding the
assembly from high voltage capacitor and
rectifier from the capacitor holder.
magnetron.
7. Remove one (1) screw holding the capacitor holder
Disconnect filament lead of tramsformer from high
to the rear cabinet.
voltage capacitor.
8. Remove the capacitor from the holder.
MAGNETRON REMOVAL
Disconnect oven from power supply and remove
outer case.
Discharge the high voltage capacitor.
Disconnect filament lead of the transformer from the
magnetron. Disconnect high voltage wire lead from
the magnetron.
Disconnect wire leads from the magnetron. Take
off three (3) screws secured the chassis support to
oven cavity and waveguide.
Disconnect wire leads from the magnetron temp.
fuse.
Remove one (1) screw holding the magnetron duct
to the magnetron.
Release tab on magnetron duct holding thermal
protection plate(right) and remove magnetron duct.
7. Carefully remove four (4) mounting screws holding
the magnetron to waveguide, when remkoving the
screws holding the magnetron to prevent it from
falling.
8. Take off the magnetron from the unit with care so
the magnetron tube should not hit by any metal
object around the tube.
CAUTION: WHEN
REPLACING THE
MAGNETRON, BE SURE THE R.F.
GASKET IS IN PLACE AND THE
MAGNETRON
MOUNTING
SCREWS ARE
TIGHTENED
SECURELY.
34
Page 37
R-7Hll
R-7H21
DAPMER ASSEMBLY REMOVAL
1.
2.
3.
4.
5.
::
3.
4.
i:
;I
1.
f :
4.
5.
1.
2.
3.
5.
Disconnect oven from power supply and remove
6. Remove one (1) screw holding the magnetron duct
outer case.
and wire holder to the magnetron and remove
Discharge the high voltage capacitor.
Disconnect wire leads from damper motor and
damper switch.
Remove three (3) screws holding the chassis suport
from rear cabinet, control mounting back plate and
wave guide flange.
Disconnect the sensor harness from control panel.
TURNTABLE MOTOR AND/OR COUPLING REMOVAL
Disconnect the oven from power supply.
Remove single (1) screw holding the turntable
motor cover to the base cabinet and take off the
turntable motor cover.
Disconnect wire lead from the turntable motor.
Remove the two (2) screws holding the turntable
motor to the mounting plate of the oven cavity
bottom.
The turntable motor is now free.
Remove the seal ring (O-ring) from turntable motor.
Pull turntable coupling out the oven cavity.
The turntable coupling will be free.
COOLING FAN MOTOR REMOVAL
Disconnect oven from power supply and remove
outer case.
Discharge the high voltage capacitor.
Remonve seven (7) screws holding the rear cabinet
to heater duct and base cabinet, unit angle and
chassis support.
Release tabs of cooling duct assembly holding to
rear cabinet. And remove rear cabinet.
Disconnect wire leads from the cooling fan motor.
OVEN LAMP SOCKET REMOVAL
Pull the wire leads from the oven lamp socket by
pusnrng
tne terminal hole ot the oven lamp socket
with the flat type small screw driver.
Lift up the tab of the oven lamp mounting plate
holding the oven lamp socket.
Slide the oven lamp socket left-ward
Now, the oven lamp socket is free.
CAUTION: When replacing the oven lamp socket, re-
place it so that the side where the black
dot is put faces left-ward.
magnetron duct.
7. Remove three (3) ovenside screws holding damper
motor angle to oven cavity.
8. Damper ass’y is free.
9. Remove two (2) screw holding the damper motor
to damper motor angle and one (1) screw holding
dampe; switch to damper motor angle.
1 O.Damper motor and switch are free.
,
TURN TABLE
OVEN CAVITY
Figure C-l. Turntable Coupling
6. Disconnect wire leads from the fan thermal cut-out.
7. Remove one (I) screw holding the cooling fan duct
to the waveguide.
8. Now, cooling fan duct assembly is free.
9. Remove fan blace from fan motor shaft by pulling
fan retainer clip.
lO.Remove two (2) screws and nuts holding the
cooling fan motor to the cooling fan duct.
‘I 1 .Now, cooling fan motor is free.
Figure C-2. Oven lamp socket
35
Page 38
-7Hll
-7H21
1.
2.
3.
4.
5.
6.
7.
8.
9.
I.
2.
3.
4.
5.
6.
7.
8.
9.
HEATER UNIT ASSEMBLY
(HEATING ELEMENT/CONVECTION FAN/CONVECTION
REMOVAL
Disconnect oven from power supply and remove the
vection heater
outer case.
(4.
MOTOR/THERMISTOR)
out of convection heater insulator
Discharge the high voltage capacitor.
Remove seven(7) screws holding the rear cabinet
to heater duct and base cabinet, unit angle and
chassis support.
Release tabs of cooling duct assembly holding to
rear cabinet. And remove rear cabinet.
Disconnect the wire leads from the thermistor,
convetion motor, thermal cut-out and convection
heater.
Remove the eleven(l1) screws holding the heater
duct to the oven cabity and base cabinet.
The heater unit is now free.
1 O.Now, the convection heater is free.
11 .Remove the two (2) screws holding the thermistor
to heater duct.
12.Thermistor is free.
CONVECTION FAN AND MOTOR REMOVAL
13.Remove the one(l) nut holding the convection fan
to the convection fan motor shaft, at this time,
washers and caller will be free. Don’t loose them.
14.Convection fan is free.
15.Remove the two(2) screws holding the convection
CONVECTION HAETER AND THERMISTOR
Remove the four(4) screws holding the convection
heater to heater duct and convection heater
insulater( B).
Loosen the two(2) screws holding the convection
heater insulator (A) to heater duct and take con-
motor mounting plate to the heater duct.
1 G.Convection motor mounting plate with convection
mtor is free.
17.Remove the two(2) screws holding the convection
motor to the convection motor mounting angle.
17.Convection motor is free.
UPPER/LOWER LATCH SWITCHES, STOP SWITCH
AND MONITOR SWITCH REMOVAL
Disconnect oven from power supply and remove
outer case.
Discharge high voltage capacitor.
Remove four (4) screws holding the control panel
back plate to the oven flange and unit angle and
chassis support.
Remove control panel assembly.
Disconnect wire leads from each switch and micro
relay.
Remove two (2) screws holding the latch hook to
oven flange.
Remove latch hook assembly from oven flange.
Push outward on the two (2) retaining tabs holding
upper latch switch, stop switch and monitor switch
in place.
Remove two (2) screws and two (2) nuts holding
lower latch switch to latch hook.
1 O.Switches are free.
Re-install
I. Re-install upper latch switch, lower latch switch,
stop swich and and monitor switch in their places.
The upper latch switch is on the top possition of
latch hook. The stop switch is on the second. The
monitor switch is on the third. The lower lstch
switch is on the bottom.
2. Re-connect wire leads to each switch and micro
relay. Refer to chapter “Pictorial Diagram”.
3. Secure the latch hook (with two (2) mounting
screws) to oven flange.
4. Make sure that monitor switch is operating properly.
Refer to chapter “Test Procedure”, and Adjustment
procedure.
5. Re-install control panel assembly.
36
Page 39
R-7Hll
I?-7H2f
UPPER/LOWER LATCH SWITCHES, STOP SWITCH
AND MONITOR SWITCH ADJUSTMENT
If the upper latch switch, lower latch switch, stop
switch and monitor switch do not operate properly due
to a mis-adjustment, the following adjustment should
be made.
1. Loosen the two (2) screw holding the latch hook
to the flange the oven front face.
2. With door closed adjust the latch hook by moving
it back and forward, or up and down. In and out
play of the door allowed by the latch hooks should
be less than 0.5 mm.
3. Secure the screws with washers firmly.
After adjustment, make sure of following:
1. The in and out play of door remains less than 0.5
mm when latched position.
2. The stop and lower latch switches
interrupts the
circuit before the door can be opened.
3. The monitor switch contacts close when the door
is opened.
4. Re-install outer case and check for microwave
leakage around the door with an approved micro-
wave survey meter. (Refer to Microwave Measure-
ment Procedure.)
Figure C-Z Latch Switches
DOOR DISASSEMBLY
Remove door assembly, refer to “Door Replacement”.
Replacement of door components are as follows:
1. Place door assembly on a soft cloth with latches
facing up.
Note:
As the engaging part of choke cover and door
panel are provided at 17 places, do not force
any particular part.
2. Insert an iron plate (thickness of about 0.5mm) to
the gap between the choke cover and corner portion
of door panel as shown to free engaging parts.
3. Lift up choke cover.
4. Choke cover is free from door panel.
Figure C-3 Door Disassembly
37
Page 40
-7Hll
-7H21
DOOR REPLACEMENT AND ADJUSTMENT
DOOR REPLACEMENT
DOOR ADJUSTMENT
1.
$:
4.
5.
6.
Disconnect oven from power supply and remove the
outer case.
Remove turntable tray and turntable support from
oven cavity.
Discharge high voltage capacitor.
Remove three(3) screws holding the lower oven
hinge using a screw-driver.
Remove lower oven hinge from oven cavity bottom
flange.
Remove door assembly from upper oven hinge on
the oven.
Door assembly is npw free.
Note:
When individual Darts are reolaced, refer to
“Door Disassembli”.
7.
8.
9.
On re-installing new door assembly, insert the upper oven hinge into the door hinge pin. Then while
holding door in place.
Make sure the door is parallel with oven face line
(left and upper side lines) and the door latch heasd
pass through the latch holes correctly.
Insert the lower oven hinge to oven cavity bottom
flange and then door hinge pin. Then secure the
lower oven hinge firmly with three (3) mounting
screws.
Note: After any service to the door;
(A)
Make dure that the upper latch switch, stop
switch, monitor awitch and lower latch switch
are operating properly. (Refer to chapter “Test
Procedure”)
w
An approved microwave survey meter should
be used to assure compliance with proper
microwave radiation emission
limitation
standars.
The door can be adjusted by keeping the screws of
each hinge loose. The lower oven hinge can be loosened with screw driver.
After adjustment, make sure of the following :
1.
2.
3.
4.
Door latch heads smoothly catch, the latch hooks
through the latch holes, and also the latch head
goes through the center of the latch hole.
Deviation of the door alignment from horizontal line
of cavity face plate is to be less than 1 .Omm.
The door is positioned with its face depressed toward the cavity face plate.
Re-install outer case and check for microwave
leakage around the door with an approved microwave survey meter.
(Refer to Microwave Measurement Procedure.)
Note: The door on a microwave oven is designed to
act as an electronic seal preventing the leakage
of microwave energy from the oven cavity during
the cook cycle. This function does not require
that the door be air-tight,
moisture
(condensation}-tight or light-tight. Therefore,
the occasional apperance of moisture, light or
the sensing of gentle warm air movement around
the oven door is not abnormal and do not of
themselves, indicate a leakage of microwave energy from the oven cavity. If such were the case,
your oven could not be equipped with a vent,
the very purpose of which is to exhaust the
vapor-laden air from the oven cavity.
Fugure C-4 Door Replacemrnt and Adjustment
38
Page 41
R-7Hll
R-7H21
MICROWAVE MEASUREMENT
After adjustment of door latch switches, monitor
switch and door are completed individually or collectively, 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;
1. Make sure that the test instrument is operating
normally as specified in its instruction booklet.
Important:
Survey instruments that comply with the requirement for instrumentations as prescribed by the per-
formance standard for microwave ovens must be
used for testing.
2.
3.
4
5.
6.
Recommended instruments are:
NARDA 8100
NAR DA 8200
HOLADAY HI 1500
SIMPSON 380M
Place the oven tray into the oven cavity.
Place the load of 275 &I 5ml of water initially at
20 f5 “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 important not only to protect the oven, but also to insure that any leakage is measured accurately.
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.
Move the probe slowly (not faster that 2.5cm/sec.)
along the gap.
The microwave radiation emission should be meas-
ured at any point of 5cm or more from the external
surface of the oven.
(RDB1103U)
39
Page 42
-7Hll
-7H21
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Figure S-2. Pictorial Diagram :(New Zealand)
Page 44
R-7Hll
R-7H21
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Page 45
R-7Hll
R-7HU
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43
Page 46
-7Hll
:-7H2-l
PARTS LIST
Note :
The voltage supplied to the parts w*” are greater than 25OV.
REF. NO. 1 PART NO.
I
DESCRIPTION
1 Q’TY ICODE
ELECTRICAL PARTS
i- 1
QACCAA021WREO Power supply cord
1
l- 2
QSW-MA009WREO Monitor switch (V-5220D-070)
AQ
1
l-
3
AF
I- 4
QFSHDA002WREO Fuse holder 1
AE
QSW-MA051WREO Upper and lower latch switches (V-16G-3C25 (R))
2
i- 5
FH-HZAOllWREO Thermistor
AF
1 AG
l- 6
QSW-MA037WREO Damper switch (V-li-3C25(RB))
l- 7
2
QFS-TA013WREO Oven temp. fuse
AE
i- 8
1
RTHM-AOOGWREO Thermal cut-out
AG
l- 9
RMOTDAO43WREO Damper motor
2
AK
l-10
1
RLMPTA029WREO Oven lamp
AQ
1
AK
l-11
l-12
QSOCLAOllWREO Oven lamp socket
RMOTDAO9lWREO Turntable motor
1
AH
l-13
RMOTEA062WREO Convection fan motor
1
AP
l-14
RMOTEA065WREO Cooling fan motor
1
AV
l-15
RHET-A037WREO Convection heater
1
AU
1
AX
1-16
RTRN-A256WREO Power
transformer
l-17
RC-QZA093WREO High voltage capacitor
1
BK
l-18
FH-DZA005WREO High voltage rectifier assembly
1
AX
l-19
RV-MZAll4WREO Magnetron (R-7H11/7H21 for Australia)
1
AQ
RV-MZA096WREO Magnetron (R-7Hll for New Zealand)
1
BG
1
BG
l-20
l-21
QSW-MA037WREO Stop switch (V-ll-3C25(RB))
2
AE
l-22
RRLY-A014WREO Micro relay
QTANN0033WREO Cord connector
1
AP
1
l-23
AD
1-24
RR-WZAOOSWREO Monitor resistor 0.8 R/2OW
RRLY-A014WREO Heater relay
1
AG
1
AP
l-25
l-26
FDTCTA093WRKO AH sensor assembly
QFS-CAOlOWREO Fuse M8A
1
AY
l-27 RFILNA003WREO Noise
filter (R-7Hll for New Zealand)
1 AE
1-28
mbly (R-?Hll for New Zealand)
CABINET PARTS
2- 1 GCABUA271WRPO Outer case cabinet (R-7Hll)
GCABUA283WRPO Outer case cabinet (R-7H21)
1
AZ
2- 2
1
BA
5: i
TMAPCA564WRRO Schematic diagram (R-7Hll for New Zealand)
GDAI-A075WRWO Base cabinet
1
AC
GLEGP0023WREO Foot
AF
41 AE
2- 5
GCABDA025WREO Rear cabinet
2- 6
2- 7
FANGQAO95WRWO Unit angle
1
AS
1 AM
2- 8
GCOVHA120WRWO Turntable motor cover
LBNDKA022WRPO Capacitor holder
1
AB
2- 9
DFTASA015WRKO Oven lamp access cover assembly (R-7Hll)
1
AD
1
AL
2- 9A
DFTASAOIGWRKO Oven lamp access cover assembly (R-7H21)
1
AL
2- 9B
LX-BZO155WREO Screw;
2- 9c
XRESE25-04000 E-ring;
oven lamp access cover mtg
oven lamp access cover mtg
1
AA
1 AA
2- 9D
XWHNZ30-05060 Washer;
XWHSD30-05000 Washer;
oven lamp access cover mtg
oven iamp access cover mtg
1 AA
2-10
1 AA
PCUSGA256WRPO Cushion
2-11
FHNG-A092WRMO Oven hinge(lower)
1
AC
2-12
LANGKA195WRWO Air protection plate
1
AF
2-13
PCUSU0316WRPO Cushion
AE
2-14
PCUSGA153WREO Cushion
t AA
2-15
1 AB
2-16
PHOK-A030WRFO Latch hook
MLEVPA082WRFO Hook lever
1
AL
2-17
MLEVPAO85WRFO Latch lever
1
AC
2-18
PCUSGA208WRPO Cushion
1
AD
2-19
LANGQ0382WRMO Earth angle
AC
2-20
LSTPPA048WRFO Cord anchorage(upper)
i AA
2-21
2-22
LSTPPA049WRFO Cord anchorage(lower)
1 AB
PCUSG0136WRPO Vibration proof cushion
1
1
22
44
Page 47
R-7Hl f
R-7H21
Note : The voltage supplied to the parts r*rr are greater than 250V.
REF. NO. 1
PART NO.
I
DESCRIPTION 1 o’w ICODE
CONTROL PANEL PARTS
;I :A
CPWBFA267WRKO Control unit (for New Zealand model only)
BS
3- 1B
QPLGJ2326DREO 2-pin connector (A)
:: AB
3- 1c
QCNCMA078DREO 4-pin connector (B)
1 AD
3- 1D
QCNCMAlOGDREO 7-pin connector 0)
AD
QCNCMA090DREO 3-pin Connector (F)
t AB
3- 1E
3- 1F
QCNCWAO3ODREO 12-pin connector (G)
3- 1G
QPLGJ2255DREO 3-pin connector (I)
1 AE
RV-KXA012DREO Fluorescent display tube
1 AB
21
1
c2
RC-KZA032DREO Capacitor
AX
0.1 MF 50V
RC-EZA192DREO Capacitor
AB
1000 PF 35V
t AD
C3,C81
c5
VCEAB31HW335M Capacitor 3.3 CIF 50V
VCEAB31CW476M Capacitor
2 AA
C6,7,20 VCKYDllCY103N Capacitor
47 ~JF 16V
AA
C51,52
0.01 PF 16v
? AA
C60,61
C8,50
c9
RC-KZ104QDREO Capacitor 0.1 CIF 25V
RC-EZA057DREO Capacitor
2 AB
Cl0
100 PF 16V
1
AB
c53
RC-EZA058DREO Capacitor 22 PF 25V
VCKYBllEX153N Capacitor
1 AB
c70
0.015 clF 25V
RC-KZA039DREO Capacitor
AA
0.015 PF 50V
I AA
C80
C82
VCEAB31HW474M Capacitor 0.47 ~JF 50V
CFl
VCEAB31HW336pi Capacitor
1 AA
33 PF 50V
AB
Dl-D5
RCRS-AOlODREO Ceramic filter (4.00MHz)
VHDllESl///-1 Diode (11ESl)
: AD
D7-D9
8 AB
D51,52,
D70,
VHDlSS270A/-1Diode (lSS270A)
20 AA
D80-88,
D92-99,
Fl
QFS-AA005DREO IC protector (ICP-NlOS)
1
AE
ICl RH-iZA225DREO LSi
IC2
1
AW
Ql
RH-iZ0021WREO IC (IR94558)
RH-TZA035DREO Transistor 2SB793
1 AE
Q2OJ0,
RH-TZA046DREO Transistor DTA143ES
1
AC
Q40,
6 AB
Q84-86
g
RH-TZA049DREO Transistor DTC114ES
RH-TZA051DREO Transistor DTD143EA
281
RH-TZA047DREO Transistor DTA114YS
282,83
RH-TZA097DREO Transistor DTB143ES
Rl
RR-DZ391PDREO Resistor
R2
RR-DZ331PDREO Resistor
390 Q 1/2w
330 Q 1/2w
R4
RR-DZ471PDREO Resistor
R5,R20
RR-DZ153NDREO Resistor
470 Q 1/2w
212
RR-DZGR2NDREO Resistor
15k R 1/4w
6.2 Q 1/4W
340,
RR-DZ332NDREO Resistor
R92-103
3.3k n 1/4w
x50
351
RR-DZA069DREO Resistor block
RR-SZ331RDREO Resistor
330 Q 1w
152
RR-NZ182NDREO Resistor
1.8k Q(F) 1/4W
153
RR-NZ364NDREO Resistor
154
RR-DZ103NDREO Resistor
360k Q (F)
10k Q 1/4w
1/4w
d55
RR-DZ473NDREO Resistor
R60,70,
RR-DZ102NDREO Resistor
47k Q 1/4w
lk R 1/4W
R81,201
R~~,R~O~RR-DZ~~~NDREO Resistor
362
RR-NZ823NDREO Resistor
27k 0 1,'4w
R63
RR-NZ330NDREO Resistor
82k n(F) 1/4w
364
RR-NZ202NDREO Resistor
33 Q(F) 1/4W
2.0k Q(F) 1/4W
382-85
RR-DZlGlNDREO Resistor
160 Q 1/4w
x200
RR-DZ105NDREO Resistor
1M Q 1,'4W
?Yl-RY4 RRLY-A020DREO Relay (OJ-SH-112LM)
SP40
RALM-A007DREO Buzzer (PKM22EPT)
I?1
RTRNPA023DREO Transformer
7RSl
RH-VZAOlODREO Varistor (15G471K-T)
AB
1' AC
AB
2' AC
1 AA
2 AA
1 AA
13 AA
1 AD
AA
:: AA
1 AA
1 AA
AA
4' AA
2 AA
AA
1 AA
AA
4' AA
1 AA
4
AH
AF
1' AR
1
AE
45
Page 48
-7Hll
b-7H21
Nntra
The unltanm cllnnlid tn the nnrts r*a are nrnntw than 7!WV
I..,.”
. .,” .V..YW” Y”psy.*-- .- . ..-
p-.-.--P -. ., J.-...‘. . ..u.. -VW -.
REF. NO.
PART NO.
DESCRIPTION
O’TY
CODE
ZDl
RH-EZA081DREO Zener diode (UZlGBSB)
1 AA
ZD2
RH-EZA080DREO Zener diode (UZ5.1BSC)
1 AA
ZD3
RH-EZA052DREO Zener diode (RD3.6EL2)
1
AB
3- 2
FPNLCA~~~WRKO Control panel frame with key unit :
R-71311
1 AZ
FPNLCA~~~WRKO Control panel frame with key unit : R-7H21 1 AZ
3- 3
JBTN-A606WRFO Open button : R-7Hll
1 AC
JBTN-A311WRFO
Open button : R-7H21
1
AC
;I ;
MSPRDA009WREO Open button spring
1 AA
LCHSMA026WRWO Control panel back plate
1
AG
3- 6 MLEVFA042WRWO
Open lever
1
AC
;I ;
NSFTTA030WREO Open shaft
1 AB
XHPSD30P12XSO Screw; control unit mtg. 5 AA
3- 9
XCPSD40P12000
Screw; control panel back plate mtg.
4
AA
OVEN PARTS
;I 2'
DOVN-A128WRYO Oven cavity
1
BK
FROLPA043WRKO Turntable support
1 AN
4- 4 NCPL-A021WRFO
Turntable coupling
1
AE
;I ;
NTNT-A013WRHO Turntable tray
1 AS
PPACGA024WREO O-ring
1 AA
4- 7 PCOVPA157WREO
Waveguide cover
AD
4- 8 PFILWA025WREO
Oven lamp filter
1-
AH
4- 9
LANGQA210WRWO
Oven lamp mounting angle
1
AD
4-10
MHNG-A107WRMO Oven hinge(upper)
1
AE
4-11
MCAMPA018WRFO
Damper cam
1
AC
4-12 PDUC-A230WRPO Exhaust duct
1
AH
4-13 FDUC-A102WRWO
4-14
Heater duct assembly
1 AU
PDUC-A189WRFO Magnetron cooling fan duct
1 AG
4-15 PDUC-A192WRWO Magnetron duct
1 AF
4-16 FFANJA018WRKO
Fan blade assembly
1
AE
4-17 NFANMAOllWRPO
Convection fan
1
AD
4-18 NFANMA012WRPO Reflection fan
1
AC
4-19
LANGQA080WRWO Convection motor mounting plate
1 AE
4-20 PFTA-A012WRWO
Damper
1
AE
4-21 NSFTTA031WRMO Damper shaft
1
AA
4-22 LANGTA128WRWO
4-23
Damper angle
1
AE
LANGQA094WRWO Thermal cut-out angle
1
4-24
AB
PCUSGA137WRPO Damper cushion
1
4-25
AG
4-26
LANGTA123WRWO Chassis support
AE
PCOVPA167WRFO AH Sensor cover
: AC
4-27 PPIPFA004WREO
Collar
4-28
1
FANGKA080WRYO
AE
Partition
4-29 PSLDHA026WRWO
plate
1 AF
4-30
Thermal protection
plate (Right)
1
4-31
PSLDHAOGOWRWO Thermal protection plate (Rear)
AK
1
PFPF-A027WREO Thermal protection sheet(Right)
AK
1
AH
4-32
4-33
PFPF-A108WREO Thermal protection sheet(Rear)
PCUSUA102WRPO Cushion
1 AK
4-34
PGISHA028WREO
1
Convection
AA
4-35
heater insulator(B)
PCUSU0316WRPO
1
Duct cushion
AF
4-36
PCUSUAlOlWRPO
3
AA
Magnetron cushion
1
AA
4-37 PCUSUA103WRPO
Cushion
4-38
PCUSGA026WRPO
Cushion
1
AA
4-39
PGISHA017WREO 1 Convection
AA
4-40 PCUSGA023WRPO
heater insulater(A)
Cabinet
2
AF
cushion
4-41
PCUSU0312WRPO
Shading
2
AA
cushion
1
AA
4-42
4-43
PSPA-A057WREO Thermal protection spacer
PCUSUA204WRPO
1
AA
cushion
4-44
Air-proof
PCUSUO272WRPO Duct D cushion
AA
2' AA
DOOR PARTS
I
5 ICLJVKFA4UYWRKOIDoor panel assemblv comnlete (R-7Hll)
H21)
I
5- 1
CDORFA428WRKO Door panel assembl? cornpie<& (R-7
5- 2
DDORFA165WRYO Door panel
PGLSPA236WREO Door glass (R-7Hll)
1-G-T
PGLSPA244WREO Door glass (R-7H21)
GCOVHA119WRFO Choke cover
I E
1
AX
1 AG
46
Page 49
R-7Hll
R-7H21
Note : The
REF. NO.
5- 4
t-
5- 5
5- 6
6- 1
6- 2
;I ;
;r "7
6- 8
6-10
6-11
6-12A
6-12B
6-13
6-14
6-15
6-16
6-17
7- 1
7- 2
;I 2
7- 5
7- 6
7- 7
7- 8
;-1:
7-11
7-12
7-13
7-14
7-15
7-16
7-17
7-18
7-19
7-20
7-21
7-22
7-23
7-24
7-25
7-26
7-28
7-29
7-30
7-31
7-32
7-33
7-34
oltane sumlied to the
PART NO.
GWAKPA138WRFO
GWAKPA034WRFO
LSTPPAO45WRFO
LSTPPA046WRFO
MSPRTA007WREO
HDECQA135WRFO
HDECQA142WRFO
HDECQA136WRFO
HDECQA143WRFO
NSFTTA052WREO
FAMI-A030WRKO
FAMI-A031WRKO
FW-VZA808WREO
FW-VZA791WREO
FW-VZA809WREO
LHLDWQ002YBEO
QW-HZA024WREO
QW-HZAO25WREO
LHLDWQ005YBEO
TCAUH0114WRRO
TCADCA267WRRO
TCADC0253WRRO
TINSEA471WRRO
TINSEA477WRRO
TSPCNB168WRRO
TSPCNB198WRRC
TSPCNB199WRRC
LHLDWQ003YBEC
LBNDK0012YBEC
TCAUH0123WRRC
XCTWW40P1200C
XBTWW40P2000C
XBTUW40P0600C
XBPSD40P2500C
XFPSD40P08KOC
XFPSD40P0800C
LX-BZ0186WREC
XFPSD40PlOOOC
XFPSD50PlOKSC
LX-CZ0047WREC
XFTSD40P0600C
LX-NZ0031YBEC
XCBWW30P0800C
XBPSD40P0800C
XBTSD40P05000
XCPSD40P08000
XCPSD30P08000
XCPSD30P06000
XCPSD30P08XOO
XOTSD40P12000
XCPSD30PlOOOO
XPSSP20-20000
LX-CZA020WREO
XCPWW3OP16000
LX-CZ0052WREO
LX-BZO202WREO
XNEUW40-32000
XNESD40-32000
XNESD30-24000
xwsuw40-10000
XCTSD40PlOOOO
XBPSD30PlGKOC
XWHUW41-1OlOC
parts
” * ” are greater than 250V.
DESCRIPTION
Door frame (R-7Hll)
Door frame (R-7H21)
Upper latch head
Lower latch head
Latch head spring
Door sash (Right) (R-7Hll)
Door sash (Right) ~;-;;~~~
Door sash (Left)
Door sash (Left)
(RI7H21)
Latch shaft
Q’TY
1
1
1
1
1
1
1
::
1
MISCELLANEOUS
LOW rack
High rack
Thermistor harness
Main wire harness (R-7H11/7H21 for Australia)
Main wire harness (R-7Hll for New Zealand)
Purse lock"S"
High voltage wire A
High voltage wire B
Purse 1ock"LL"
Caution label
Cook book
Cook book
Operation manual (R-7Hll)
Operation manual (R-7H21)
Name plate (R-7Hll for Australia)
Name plate (R-7H2i for Australia)
Name plate (R-7Hll for New Zealand)
Purse lock "M"
Wire holder (WH-1 "L" 84mm)
Micro caution (R-7Hll for New Zealand)
SCREWS NUTS WASHERS AND PINS
Screw; M4x12 chrome steel
Screw; M4x20 chrome steel
Screw; M4x 6 stainless steel
Screw;
M4x25 zinc plated steel
Screw; M4x 8 zinc plated steel
Screw;
M4x 8 zinc plated steel
Special screw
Screw; M4xlO zinc plated steel
Screw; M5xlO zinc plated steel
Special screw;
Screw; M4x 6 zinc plated steel
Speed nut
,
Screw; M3x 8 chrome steel
Screw; M4x 8 zinc plated steel
Screw; M4x 5 zinc plated steel
Screw; M4x 8 zinc plated steel
Screw; M3x 8 zinc plated steel
Screw; M3x 6 zinc plated steel
Screw; M3x 8 zinc plated steel
Screw; M4x12 zinc plated steel
Screw;
Pin;
M3xlO zinc plated steel
M2x20 steel
Special screw;
Screw; M3x16 chrome steel
Special screw
Special screw
Nut; M4x3.2 stainless steel
Nut; M4x3.2 zinc plated steel
Nut; M3x2.4 zinc plated steel
Washer;
M4xl.O stainless steel
Screw;
Screw;
M4XiO zinc plated steel
Washer;
M3x16 zinc plated steel
M4.1xl.O stainless steel
47
1
1
1
i
i
i
1
1
1
2’
3
1
2
;
2
1
11
3
CODE
AR
AS
AB
AB
AB
AF
AF
AE
AE
AC
AQ
AQ
AS
AY
AZ
AD
AD
AA
AC
AK
AR
AG
AM
AC
AD
AH
AA
AA
AE
AA
AA
AA
2
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
Page 50
?-7Hll
%-7H21
Note :
The voltane SUDDiied to the Darts rr*m are areater than 250V.
REF. NO.
7-35
7-36
7-37
7-38
7-39
7-40
7-41
7-41
7-42
- . .
PART NO.
7-43
7-44
7-45
XWHUW50-10120
XUBSD30P08000
XBPSD40P25KSO
XFPSD30PlOOOO
XFPSD30P15000
XFPSD40PlOKOO
XHTSD40P08RVO
XWWSD50-06000
XOTSC40P12000
XOTSF40P12000
Washer;
M5xl.O stainless steel
1
Screw; M3x 8 zinc plated steel 2
Screw;
M4x25 zinc plated steel 1
Screw; M3x10 zinc plated steel 1
Screw;
M3x15 zinc plated steel
1
Screw;
M4xlO zinc plated steel 1
Screw;
M4x 8 zinc plated steel
1
Washer;
M5x0.6 chrome steel
Screw;
M4x12 chrome plated steel CR-7Hll) 4'
Screw:
M4x12 zinc plated steel (R-7H21)
4
XNASD40-20000
LX-EZA037WREO
Nut; M4x2.0 zinc plated steel
Special screw
XCPWW3OPlZXSO Screw;
M3x12 chrome steel
DESCRIPTION 1 Q’TY
HOW TO ORDER REPLACEMENT PARTS
To have your order filled promptly and correctly, please furnish the following information.
CODI
AA
AA
AA
AA
AA
AA
AA
AA
1. MODEL NUMBER 2. REF. NO.
3. PART NO.
4. DESCRIPTION
(RDP1303U)
48
Page 51
1
I
2
/
3 4
1 5 , 8
CABINET PARTS
1
I
2
I
3
4
5
6
R-7Hll
R-7H21
49
Page 52
%-7Hll
q-7H21
1 I 2 ! 3 4 5 0
r
OVEN PARTS
r------
1
1
2
3
4
5
1
6
50
Page 53
R-7Hll
R-7H21
E
F
G
H
-
CONTROL PANEL PARTS
DOOR PARTS
0
5-3
/
1 i
2
3
4
5
6
51
Page 54
:-7Hll
.-7H21
I--l
I
A/
/
/
1
j
/
/
I
Bi
/
I
I
I
I
1
I
/
I
C(
I
I
/
D,
I
,
-1
E
1
2
3
I
4
5
I
b
MISCELLANEOUS
0
6- I
MG
,/
WC
I
PACKING ACCESSORIES
HIGH RACK
LOW RACK
DOOR PROTECTION SHEET
-
* ’ lSPAOfV336WREOl
.’
-----
PACKING ADD Kll
* (CPADBAOVWRK
I
PLASTIC BAG
CASE
3323WRE0 : R-7H7 t(J)
3368WREO : R 7H21 (J)
3369WRE0 : R-7Hl l(Z)
* Not Replaceable Items.
52
Page 55
R-7Hll
R-7H21
-.
--- ----.---.- -
Page 56
R-7Hll
R-7H21
(RDXI 101 U)
SHARP
‘89 0 SHARP CORP. (9U0.96E) Printed in Australia
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