Sharp R-9H10 Service Manual

Page 1
R-9HlO
SHARP SERVICE MANUAL
S9808R9Hl OJ//
CONVECTION
MICROWAVE OVEN
In interests of user-safety the oven should be resto!ed to its original
condition and only parts identical to those specified should be used.
TABLE OF CONTENTS
Page
FOREWORD
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..*....*...............................................................................
1
CAUTION, MICROWAVE RADIATION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..~.............................................
1
PRODUCT DESCRIPTION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
GENERAL INFORMATION
..............................................................
OPERATING INSUTRACTIONS
......................................................
OPERATION
.......................................................................................
SERVICING
........................................................................................
TOUCH CONTROL PANEL ASSEMBLY
........................................
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDl
J
MICROWAVE MEASUREMENT PROCEDURE
.............................
...............................................................
3
............................................................... 3
............................................................... 4
............................................................
11
............................................................ 22
RE
.....................................................
31
............................................................ 37
PICTORIAL
DIAGRAM
..................................................................................................................................
38
CONTROL PANEL CIRCUIT
.........................................................................................................................
39
PRINTED WIRING BOARD
..........................................................................................................................
40
PARTS LIST
....................................................................................................................................................
41
PACKING AND ACCESSORIES
...................................................................................................................
46
SHARPCORPORATION
Page 2
R-9HlO
Page 3
R-9HlO
SERVICE MANUAL
SHARI=
CONVECTION MICROWAVE OVEN
R-9HlO
FOREWORD
This Manual has been prepared to provide Sharp Corp. Service
Personnel with complete Operation and Service Information for
the SHARP CONVECTION MICROWAVE oven, R-9HlO.
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.
(RD361 OZU)
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 ‘I*” are used in voltage more than 250V.
(RD36202U)
SHARPCORPORATION
OSAKA, JAPAN
PRODUCT DESCRIPTION
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TOUCH CONTROL PANEL
: ASSEMBLY
1 COMPONET REPLACEMENT
I
AND ADJt’“,TMENT
MICROWAVE
‘I
1”
MEASUREMENT
3
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WIRING DIAGRAM J
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PARTS LIST
(RD37201 U)
Page 4
R-9HlO
PRODUCT DESCRIPTION
SPECIFICATIONS
ITEM
Power Requirements
240 Volts 50 Hertz
DESCRIPTION
Power Consumption
Power Output
Convection Power Output
Case Dimensions
Single phase, 3 wire earthed 1500W (Microwave)
16OOW (Convection) 750 watts nominal of RF microwave energy (2 liter water load)
Operating frequency of 24501311 Hz 1500 Watts
Width 627mm
Height 378mm Depth 481 mm
Cooking Cavity Dimensions
Control Complement
Width 41 Omm
Height 245mm Depth 41 Omm
Touch Control System Clock( I:00 - 12:59 )
Set Weight
Timer (0 - 99 min. 99sec. ) Microwave Power for Variable Cooking
Repetition Rate;
HIGH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Full power throughout the cooking time
MED HIGH
. . . . . . . . . . . . . . ..I.....*....................*...
approx. 70% of Full Power
MED
.,.................,,.........,.,........I..............,.
approx. 50% of Full Power
MED LOW (DEFROST)
. . . . . . . . . . . . . . . . . . . . . . . . . .
approx. 30% of Full Power
LOW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
approx. 10% of
Full
Power
Convection Temperature for Variable Cooking
CONVECTION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
40 to 250
“C Temp.
control
LOW MIX, BAKE ..,................
180 “C with 10% microwave power
HIGH MIX, ROAST
. . . . . . . . . . . . . . .
200 “C with 30% microwave power
SLOW COOK
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
130 “C for 4 hours (no preheat)
GRILL
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
250 “C (preheat)
Variable cooking control pads, AUTO START/CLOCK pad
EASY DEFROST pad, ONE TOUCH REHEAT pad, SENSOR COOK pad COMPU COOK pad, STOP/CLEAR pad, MEMORY pad INSTANT COOK/START pad
Approx. 30.0 kg
1
U)
QOTE:
Numbers and letters shown after sentences such as “RD44101 U” are for factory use only.
2
Page 5
R-9H10
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 f
or coloured green or green-and-yellow. The wire which is coloured blue must be 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.
(RD51108u
OPERATING INSTRUCTIONS
ONE TOUCH REHEAT PAD
.
Touch to set clock or auto start
VARIABLE COOKING CONTROL PADS
Touch to select microwave power setting. HIGH is automatically selected if a power pad is not touched.
twice to cancel cooking pro­gramme.
-M-ORE(A), LESS(v) PADS Touch to increase/decrease the time in one minute increments
multiples each time this pad is touched during cooking. Touch to start oven after set­ting programmes.
Page 6
R-9HlO
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
--. RY-1 oven lamp/turntable motor
-­RY-2
power transformer
RY-3
convection heater RY-4 damper motor RY-5
convection motor RY-6 fan motor
OFF CONDITION
Closing the door activates both door interlock switches: upper latch switch, lower latch switch and stop switch. (In this condition, the monitor switch contacts are opened.) When oven is plugged in, 240 volts A.C. is supplied to the control unit. (Figure O-l ).
1. The display will show flashing “88:88”. 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”,“,el is input to the control unit, energizing the coil of shut-off relay (RY4). RY4 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 RY4 is de-energized, opening its contacts, thereby turning off the damper motor.
(RD71207U)
COOKING CONDITION
HIGH COOKING
Program desired cooking time and Variable Cooking Control by touching the number pads and the 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
2
connected to the relays are turned on (RY?, RY2,
RY6).
(For details, refer to Figure O-2) 240 volts A.C. is supplied to the primary winding of the power transformer and is converted to about
3.35 volts A.C. output on the filament winding, and approximately 2120 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
6.
7.
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, monitor switch, 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 is mechan­ically associated with the door so that it will func­tion in the following sequence.
(1)
When the door opens from a closed position, the upper latch switch and lower latch switch open their contacts,
and then the monitor
switch contacts close.
(2)
When the door is closed from the open posi­tion, the monitor switch contacts first open, and then the contacts of the upper latch switch
and lower latch switch close. If the common and normal open contacts of upper latch switch fail with their contacts closed when the
door is opened, the closing of the monitor switch contacts will form a short circuit through the fuse and upper latch switch, causing the monitor fuse to blow.
MED HIGH, MED, MED LOW (DEFROST), LOW COOKING
When Variable Cooking Power is programmed, the 240 volts A.C. is supplied to the power transformer
intermittently through the contacts of relay( RY-2) which is operated by the control unit within a 32 sec­ond time base. Microwave power operation is as fol­lows:
VARI-MODE - ON TIME
OFF TIME
HIGH
. 32 sec.
0 sec.
(100% power) MED HIGH
24 sec.
8 sec.
(approx. 70% power) MED
18 sec. 14 sec.
(approx. 50% power) MED LOW (DEFROST)
12 sec. 20 sec.
(approx. 30% power) LOW
6 sec. 26 sec.
(aoarox. 10% Dower1
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.
(RD71401 U)
4
Page 7
R-9HlO
CONVECTION COOKING CONDITION
5. At the end of the convection cook cycle, shut-off
PREHEATING CONDITION
relay (RY4) is energized turning on the damper
Program desired convection temperature by touching
meotor. The damper is returned to the open position,
the CONVECTION pad and the temp. pad.
closing the damper switch contacts which send a
When the START pad is touched, the following oper-
signal to the control unit, de-energizing shut-off
ations occur:
relay (RY4).
1.
2.
3.
4.
The coil of shut-off relays (RYI, RY5 and RY6) are energized, the oven lamp, cooling fan motor, turntable motor and convection motor are turned
y:e coil of relay (RY4) is energized by the CPU unit. The damper is moved to the closed position, opening the damper switch contacts. The opening of the damper switch contacts sends a signal to the LSI on the CPU unit de-energizing
‘the relay (RY4) and opening the circuit to the
damper motor.
-.
The coil of heater relay (RY3) is energized by the CPU unit and the main supply voltage is added to the convection heater. When the oven temperature reaches the selected preheat temperature, the following operations oc­cur: 4-1. The heater relay (RY3) is de-energized by
the CPU 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 convection 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 oper­ations occur:
1.
2.
3.
4.
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 (RY3) is energized (if the cavity tem­perature is lower than the selected temperature) and the main 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 90 ‘C., the circuit to RY6 will be maintained (by the thermistor circuit) to continue operation of the cooling fan motor until the temperature drops below 90 “C., at which time the relay will be de-energized, turning off the fan motor. Relay RY5 will however, open as soon as the convection cycle has ended, turning off the convection fan motor.This will now cool and aNow the damper door to open.
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 When the START pad is touched, the following oper­ations occur:
1.
2.
3.
4.
5.
6.
The numbers of the digital readout start the count down to zero. The shut-off relay (RYI, RY5 and RY6) are ener­gized, turning on the oven lamp, turntable motor, cooling fan motor and convection motor. The shut-off relay (RY4) is energized. The damper door is closed from the open position. The heater relay (RY3) is energized, adding the mains supply voltage to the convection heater. Now, the oven is in the convection cooking con­dition. When the oven temperature reaches the selected
temperature, the following operations occur:
6-l. The power supply voltages is added to the
convection heater and power transformer al­ternately.
6-2. The convection heater operates through the
heater relay (RY3) contacts and the power transformer operates through the cook relay (RY2) contacts.
6-3. These are operated by the CPU unit to sup-
ply alternately within a 32 second time base, convection heat and microwave energy.
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.
(MICRO.1 OFF
I I
I
I
!
‘ON
I I
OFF
LOWMIX’
BAKE
MICROWAVE POWER
- Approx. 10%
CONVECTION TEMPERATURE
- lao°C
- Approx. 30%
CONVECTlOU
TEMPERATURE
ICONVECJ
- 2oo”c
I
32 sac.
t=
HIGH MIX
-­ROAST
5
Page 8
R-9HlO
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:
1.
2.
Potatoes at
room temperature.
Vapor is em
itted very slowly.
Heat potatoes. Moisture and humidi
ty is emitted
rapidly You can .sr?ll the aroma as it cooks.
2. Select desired Sensor setting.
3.
Touch START pad.
4.
The coil of shut-off relays( RYI ,RY6) 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 cook relay (RY2) 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
5.
6.
7.
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 relay and cook 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.
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 (RYI, RY3, RY5 and RY6) are energized, turning on the oven lamp, turntable motor, cooling fan motor and convection motor. The power supply voltage is added to the con­vection heater.
4. Now, the oven is in the convection cooking mode.
5. When the oven temperature has reached the pro­grammed convection temperature, the oven goes into the programmed cooking mode.
3. Sensor detects moisture and humidity and calcu­lates cooking time and variable power.
Cooking Sequence.
1. Touch SENSOR COOK 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.
6.
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 poultry faster and better.
EASY DEFROST key has 4 defrost stages.
EASY DEFROST automatically defrosts roast beef, etc. When EASY DEFROST is selected and the food weight is entered by using the number pads, the oven will cook according to the special cooking sequence.
Page 9
A
240V-50Hz
240V-50Hz
TEMP.
FUSE
l45’C
7EMP. FUSE
145’C
OVEN THERM0 CUT-OUT
150-c
OVEN THERM0 CUT-OU’
15O’C
UPPER LATCH SWITCH
MONITOR RESISTOR
MONITOR SWITCH
O.S/2OW
“Y”
MONITOR RESISTOR
MONITOR SWITCH
FM
THERM0 CUT- OUl 90’ c
LOWER LATCH
SWITCH
I.AC CORD CONNECTION
BRN :
BROWN BLU : BLUE G-Y : GREEN AND
YELLOW STRIPE
/I7 : SECT I ONAL AREA
OF I .Omm’ MIN.
2.ORANGE WIRE (LIVE) MUST BE CONNECTED
TO THE CABINET-SIDE TERMINAL OF POWER TRANSFORMER.
/
FM 1HERMC CUT- cJu1 90’ c
LOWER L ATCH
SWITCH
“L
I
A FAN MOTOR 7
_-_--
A-3
-----
A-3
UPPER LATCH SWITCH
CONTROL UN IT
SENSOR COOKING
SCHEMATIC
NOTE: CONDITION
OF OVEN
1. DOOR CLOSED
2. “SENSOR COOK” PAD TOUCHED
3. “START” PAD TOUCHED
SCHEMATIC
NOTE: CONDITION
OF OVEN
1. DOOR CLOSED
2. CLOCK APPEARS
HIGH COOKING
DAMPER MOTOR
II
SCHEMATIC
NOTE: CONDITION
OF OVEN
1. DOOR CLOSED
2. COOKING TIME PROGRAMMED
3. VARIABLE COOKING CONTROL “HIGH”
4. START PAD TOUCHED
1
-CONVECTION MOTOR
w
CONVECTION MOTOR
TURNTABLE MOTOR
TURNTABLE MOTOR
I
CONVECTION HEATER
CONVECTION HEATER
POWER TRANSFORMER
L.
H.V. RECTIFIER
MAGNETRON
H.V. RECTIFIER
MAGNETRON
Figure O-2. Oven Schematic-High and Sensor Cooking Condition
Figure O-l. Oven Schematic-OFF Condition
Page 10
SCHEMATIC
NOTE: CONDITION
OF OVEN
1. DOOR CLOSED
2. CONVECTION PAD TOUCHED
3. DESIRED TEMP. PAD TOUCHED
4. START PAD TOUCHED
OVEN THERM0 CUT-OUl 150-c
UPPER LATCH SWITCH
Figure O-3. Oven
Schematic-Convection Cooking Condit
#ion
Figure O-4 Oven Schematic-Automatic Mix Cooking Cordition
AL
240V-50Hz
MONITOR RESISTOR MONITOR SWITCH o.l3/2ow
OVEN LAMP
DAMPER MOTOR
-CONVECTION MOTOR
TURNTABLE MOTOR
FM lHERM0 CUT-OUl 90’ c
LOWER LATCH SWITCH
$3, ~~:~~FORMEA
1
OVEN THERM0 CUT-OUT
I50 c
4-h
240V-5OHz
UPPER LATCH SWITCH
SCHEMATIC NOTE:CONDITION OF OVEN 1 .DOOR CLOSED
2.MIX COOKING PAD TOUCHED 3,DESIRED TEMP. TOUCHED
4.START PAD TOUCHED
MONITOR RESISTOR
MONITOR SWITCH
o.a/2ow
[..,
c E-4
I
RY5 ;
DAMPER SWITCH
i
E-5
CONTROL UN IT
-DAMPER MOTOR
~-CONVECTION MOTOR
1EhkP. FUSE
145’C
/
FM ltiERM0 CUT-OUT 90’ c
LOWER LATCH SW I TCH
CONVECTION HEATER
H.V. RECTIFIER
MAGNETRON
Page 11
R-9HlO
DESCRIPTION AND FUNCTION OF COMPONENTS
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
CPU unit causes the heater relay to operate, thus the current to the convection heater is turned ON/OFF.
OVEN THERMAL CUT-OUT
The oven thermal cut-out located on the right side of the thermal protection plate is designed to prevent damage to the convection heater unit if an overheated condition develops in the tube due to cooling fan fail-
ure, obstructed air ducts, dirty or blocked air intake, etc.
Under normal operation, the oven thermal cut-out re­mains closed. However, when abnormally high tem­peratures are reached within the heater unit, the oven thermal cut-out will open, causing the oven to shut down. When the oven has cooled temperature, the oven thermal cut-out closes.
(RD72407U’)
MO’NITOR SWITCH
The monitor switch is mounted on the latch hook. It
is activated (the contacts opened) by the upper latch head when the door is closed. The switch is intended
to render the oven inoperative by means of blowning the fuse when the contacts of the common and normal
open contacts of upper latch switch fail to open when
the door is opened.
Functions:
I. When the door is opened, the monitor switch con-
tacts close (to the ON condition) due to their being normally closed. At this time the the common and normal open contacts of upper latch switch are in the OFF condition (contacts open) due to their being normally open contacts switch.
2. As the door goes to a closed position, the monitor switch contacts are first opened and then the common and normal open contacts of upper latch switch close. (On opening the door, each of these switches operate inversely.)
3. If the door is opened during cooking, and the common and normal open contacts of upper latch switch fail to open, the monitor fuse blows simul­taneously with closing of the monitor switch con­tacts
CAUTION:BEFORE REPLACING A BLOWN FUSE
TEST THE UPPER LATCH SWITCH AND
MONITOR SWITCH
FOR
PROPER
OPERATION.( REFER TO CHAPTER “TEST
PROCEDURE”).
AFTER REPLACING FUSE ALSO REPLACE
MONITOR SWITCH.
STOP -SWITCH
The stop switch is activated by the latch head. When the door is opened while the oven is in cook cycle, the stop switch contacts open to de-energize the relay( RY-1 ,RY-2,RY-3,RY-5,RY-6).
Then the cook cycle is stopped.
(RD72EOl U’)
UPPER AND LOWER LATCH SWITCHES
Those latch switches are mounted in the latch hooks as shown in figure.
They are activated by the latch heads on the door. When .the door is opened, the switches interrupt the circuit to all components except CPU unit and relay unit and oven lamp. A cook cycle cannot take place until the door is firmly closed thereby activating both interlock switches.
.A
LATCH HOOK
LATCH HEAD
/
UPPER LATCH SWITCH
STOP SWITCH
MONITOR FUSE
MONITOR SWITCH
LOWER LATCH SWITCH
SWITCH LEVER
OPEN LEVER
DOOR OPEN BUTTON
Figure D-l. Upper Latch Switch, Lower Latch
Switch, Monitor Switch and Stop Switch
CONVECTION HEATER
The convection heater is located at the left side of the oven cavity. It is intended to heat air driven by the convection fan. The heated air is kept in the oven and force-circulated and reheated by the convection heater.
Page 12
R-9HlO
CONVECTION COOKING SYSTEM
This oven is designed with a hot air heating system where food is not directly heated by the convection
heater, but is 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 left 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 left side 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 ihe oven
cavity drops below the selected temperature, the con-
vection heater is energized again. In this way, the in-
side of the oven cavity is maintained at approximately
the selected temperature. When the convection time reaches 0, the convection
heater is deenergzed and the convection fan stops op­erating and the oven shutts off. 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 tem-
perature is above 90 “C., the circuit to RY6 will be
maintained (by the thermistor circuit) to continue op­eration of the cooling fan motor until the temperature drops below 90 OC., at which time the relay will be de-en !rgized, turning off the fan motor. Relay RY5 will howe? er, open as soon as the convection cycle has ended, turning off the convection fan motor.This will now cool and allow t!, damper door to open.
(RD72NOl U’)
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, motor cam and damper shaft.. These components are operated by a signal that judges if microwave cooking or convection cooking operation is selected by the CPU 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 Operation
1. When power supply cord is plugged in: 1-I. When power supply cord is plugged in, a sig-
1-2
1-3
1-4
1-5.
nal is sensed in the control unit, and operates shut’-off relay (RY4). Contacts of shut-off relay (RY4) close, the damper motor is energized, opening the damper door.
When the damper is moved to the open posi-
tion 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 (RY4) is turned off. The 240 volts A.C. to the damper motor is
stopped and the motor turns off.
2. When oven is microwave cooking: Damper is in the open position.
3. When oven is convection cooking: 3-l.
3-2.
3-3.
3-4
NOTE:
Damper motor is energized by touching the convection, temperature and START pads. When damper is in the closed position
(damper switch is OFF), its signal is sensed by the control unit, and shut-off relay (RY4) is de-energized.
The damper is held in the closed position during the convection cooking operation. At the end of the convection cooking, shut-off relay (RY4) is energized, and the damper is
returned to the open position. If the damper door is not in the proper position, closed durin convection or open durning microwave, the control unit will stop oven op­eration after 1 minute.
Cooking Mode Operation of Damper Microwave cooking OPEN Convection cooking CLOSE Sensor cooking OPEN
Automatic mix cooking
CLOSE
Grill cooking CLOSE
Slow cookina CLOSE
(RD72002U)
DAMPER SHAFT
DAMPER DUCT
DAMPER CAM
DAMPER SWITCH
DAMPER MOTOR
Figure D-l. Damper Mechanism
10
Page 13
R-9HlO
SERVICING
TROUBLESHOOTING GUIDE
When troubleshooting the microwave oven, it is
helpfull to follow 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.
IMPORTANT: If the oven becomes inoperative be-
cause of a blown fuse in the monitor
switch and upper latch switch circuit, check the monitor switch and upper latch switch before replacing the fuse.
If the fuse is replaced, the monitor switch should be replaced at same time.
(RD81102U’)
11
Page 14
R-9HlO
OFF CONDTION
COOKING
CONDTION
IYE-)
I
CONVEC­TION
(SENSOR)
Problem
Home fuse blows when power cord is plugged into wall receptacle. Fuse blows when power cord is plugged into wall receptacle. 88:88 do not appear in display when power cord is first plugged into wall outlet.
Display does not operate properly when STOP/CLE AR Key is touched. (Beep should sound and trme of day should appear in display.)
Oven lamp does not light with door opened. Oven lamp does not light in cook cycle.
(Does light when door is opened)
Oven lamp does not light at all.
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 in oven load.(Food incompletely cooked or not cooked at all at end of cook cycle.)
Oven goes into a cook cycle but extremely uneven
heating is produced in open load(food).
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
not heat.
Temperature in the oven cavity is lower or higher
Convention cycle runs 1 minute then shuts down.
Convection cycle runs 3 minutes then shuts down.
Oven is in the sensor cooking condition but AH
sensor dbes not end stage 1 or does not stop
cooking cvcle or the oven stops soon.
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Page 15
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13
Page 16
R-9HlO
TEST PROCEDURES
PROCEDURE
LETTER
A
COMPONENT TEST
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, rectifier, 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;
Pxt/4.2=Vx AT P (W) = 4.2 x V x AT/t
Our condition for the water load is as follows:
Water load . . .
2000 ml, Heating time . ..I 12 seconds
P = 75 x 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 (1) 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 112 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 satis-
factory, execute the measurement several times and judge the result from the synthetic point of view. Microwave output power should be within + 15% of the nominal one.
Calculation of output power; Microwave output power
. ..P(W)=75x AT(C)
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. I. Initial temperature of salt water should be IO f 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 mer­cury thermometer is recommended.
3. Water container should be one (1) litre beaker made of Pyrex glass and its diameter approxi­mately 12 cm.
14
Page 17
R-9HlO
TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER
COMPONENT TEST
4. Room temperature should be around 20 “C.
5. Power supply voltage should be specification voltage.
(RD82304U’)
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 sho.uId be approx. 1.3 ohm and the resistance of the high voltage coil should be approximately 72 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 MEASlJRE THE FILAMENT AND HIGH VOLTAGE.)
(RD82401 U’)
C HIGH VOLTAGE RECTIFIER AND RECTIFIER TEST
DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPO­NENTS OR WIRING.
HIGH VOLTAGE RECTIFIER TEST Isolate the high voltage rectifier from the circuit. Using the highest ohm scale of the meter, read
the resistance across the 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.
ASYMMETRIC RECTIFIER TEST
Isolate the rectifier from the circuit. Using the highest ohm scale of the meter, read the resistance across the terminals, reverse the leads to the rectifier 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.
D
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 IOM 0 once the capacitor is charged. If the above is not the case, check the capacitor with an ohmmeter to see if it is shorted between the terminals. If it is shorted, replace the capacitor.
tRD82603U)
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
(COM)
Common Terminal-Normally Close Terminal
(NO)
Operation
(COM) (NC)
i
Plunger released Plunger pushed
Open circuit Closed circuit
Close circuit Open circuit
C RD82701 U)
15
Page 18
q-9HlO
TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER
COMPONENT TEST
F
MONITOR SWITCH TEST
Before performing this test, disconnect oven from power supply and make sure that the upper latch switch is operating properly referring to the above Switch Test Procedure. Disconnect the wire lead from the monitor switch (NC) terminal.
Check the monitor switch operation by using the ohmmeter as follows. When the door is open, the meter should indicate a closed circuit. When the monitor switch actuater is pushed by a screw driver through the latch hole on the front plate of the oven cavity with the door opened (in this condition the plunger of the monitor switch
is pushed in), the meter should indicate an open circuit.
If improper operation is indicated, replace the defective switch.
After testing the monitor switch, re-connect the wire lead to the monitor switch (NC) terminal.
SWITCH
G
BLOWN FUSE
If the fuse in the upper latch-monitor switch circuit is blown when the door is opened, check the upper latch switch and monitor switch according to the Test Procedure for those switches, before
replacing the blown fuse.
If the fuse is replaced, the monitor switch should be replaced at the same time.
If the fuse is blown by improper switch operation, adjust or replace the defective switch, fuse at
the same time.
Replace the fuse and monitor switch, even if the switches operate normally
CAUTION; REPLACEMENT FUSE MUST BE THE LISTED FUSE IN PARTS LIST.
(RD82C03U’)
H
MAGNETRON TEMP. FiiSE TEST
A continuity check across the temp. fuse terminals should indicate a closed circuit unless the temperature of the temp. fuse reaches approximately 145 “C.
An open magnetron temp. fuse indicates overheating of the oven cavity. If the temp. fuse indi-
cates an open circuit, replace the temp. fuse and check for restricted air flow to the magnetron through the vent holes of the oven cavity, especially the air duct and cooling fan ass’y.
Or an open oven temp. fuse indicate overheating of oven cavity.
Replace the oven temp. fuse and check inside of the oven cavity and unproper setting of cooking
time or accident of the timer.
(RD82G05U’)
16
Page 19
R-9HlO
TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER
COMPONENT TEST
I
OVEN THERMAL CUT-OUT
A continuity check across the thermal cut-out terminals should indicate a closed circuit unless the temperature of the thermal cut-out reaches approximately 150 “C. The termal cut-out resets automatically at approximately 130 “C.
If the thermal cut-out has opened under the normal condition, replace the same one is parts list. An open thermal cut-out indicates overheating of the heater unit. Check for restricted air flow to the heater unit through the vent holes of the oven cavity, especially the heater duct and con­vection fan.
FAN THERMAL CUT-OUT TEST
A continuity check across the thermal cut-out terminals should indicate a closed circuit unless
the temperature of the thermal cut-out reaches approximately 90 “C. The termal cut-out resets automatically at approximately 70 “C. An open thermal cut-out indicates locking the fan motor running and brocking the vent hole on the unit. Check for restricted air flow to the magnetron through the opening in the chassis, es­pecially the cooling duct and cooling fan motor.
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 convection heater terminals should be approximately 37.5 ohms.
b. Disconnect wire leads and measure the insulation resistance with 500V - 1 OOM n insulation
resistance meter. The insulation resistance between convection heater terminal and cavity should be more than 1 OOM n.( However when convection heater is hot more than 0.5M n)
THERMISTOR TEST
Disconnect connector-E from the control unit, Measure the resistance of the thermistor with an ohmmeter. Connect the ohmmeter leads to Pin No’s E-3 and E-4.
Room Temp.
Resistance
20 “C - 30 “C
Approx. 300 fI - 192 n
If the meter does not indicate above resistance, replace the thermistor.
L
DAMPER MOTOR TEST
When the power cord is plugged into the wall receptacle, and 240 volts A.C. is supplied to the damper motor the motor operates until the damper is opened and the damper switch closes. Then the damper motor stops operation.
If the damper motor does not operate, check for AC voltage with a voltmeter at the motor.
1. Disconnect the power cord from the wall receptacle.
2. Disconnect the wire leads of motor and connect the meter leads to the wire leads of main wire harness.
3. Reconnect the power cord into the wall receptacle.
If 240 volts A.C. is indicated at the wire leads, replace the motor.
Not indicated, check the wire harness and the control unit.
M
DAMPER SWITCH TEST
Disconnect the wire leads from the switch terminals and connect ohmmeter leads to the common (COM) and normally open (NO) terminals of the switch.
1. When switch actuator is pushed by the damper motor cam, the meter should indicate a closed
circuit.
2. When the power cord is plugged into the wall receptacle, the damper motor operates and damper cam starts to rotate. The switch actuator is released the meter should indicate an open circuit.
If improper operation is indicated, replace the damper switch.
17
Page 20
R-9HlO
TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER
COMPONENT TEST
TOUCH CONTROL PANEL ASSEMBLY TEST
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 di-
vided into two units, Control Unit and Key Unit and troubleshooting by unit replacement is de-
scribed according to the symptoms indicated.
1. 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 In connection with pads. a) When touching the pads, a certain group of pads do not produce a signal. b) When touching the pads, no pads produce a signal. 2-2 In connection with indicators a) At a certain digit, all or some segments do not light up. b) At 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 ficker. 2-3 Other possible troubies caused by delx. je control unit. a) Buzzer does not sound or continues to sound. b) Clock does not operate properly. c) Cooking is not possible. 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.
(RD82SOl U)
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,Cook 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.
RELAY SYMBOL
OPERATIONAL CONNECTED COMPONENTS
VOLTAGE
RYl Approx. 13 V.D.C
Oven lamp and Turntable motor
RY2 (COOK)
Approx. 13 V.D.C
Power transformer
RY3 (HEATER) Approx. 13 V.D.C
Heating element
RY4
Approx. 14 V. D.C.
Damper motor
RY5
Approx. 14 V.D.C.
Convection motor
RY6
Approx. 13 V.D.C
Cooling fan motor
(RD82ROW)
18
-.
Page 21
R-SHIO
TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER COMPONENT TEST
P 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 serves as a substitute coil. If the foil pattern is open, follow the troubleshooting guide given below for repair.
Problem: POWER ON, indicator does not light up.
STEPS OCCURANCE CAUSE OR CORRECTION
1 The rated voltage is not applied to POWER terminal Check supply voltage and oven power cord.
of CPU connector (CN-A)
2 The rated voltage is-applied to primary side of power Power transformer or secondary circuit defective.
transformer. Check and reuair.
3 Only pattern at “a” is broken. ‘Insert jumper wire 1 and solder.
4
Pattern at “a” and “b” are broken. ‘insert the coil RCILF2003YAZZ between “c” and
I’d”.
NOTE:’ At the time of these repairs, make visual in-
spection of the varistor for burning damage and examine the transformer with tester for the presence of layer short-circuit (check primary coil resistance). If any abnormal condition is detected, replace the defective parts.
I
19
Page 22
?-9HlO
TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER
COMPONENT TEST
AH SENSOR
Checking the initial sensor cooking condition
(1) The oven should be plugged in at least five minutes before sensor cooking. (2) Room temperature should not exceed 95 “F. (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 op­eration. The cabinet should be installed and screws tightened.
(1) 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 2. Now, the oven is in the sensor cooking
condition and SC-2i indicator will appear in the display.
(5) Touch Start pad.The oven will operate for the first 16 seconds, without generating micro-
wave energy.
When the AH sensor is defective (open or short), ERROR will appear in the display after 16 seconds cleaning time.
If ERROR appears check sensor wire connections and/or AH sensor.
NOTE: ERROR will appear if the door is open 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 (bubbling).
If the oven does not turn off, replace the AH sensor or check the control unit, refer to expla­nation below:
-s
TESTING METHOD FOR AH SENSOR AND’/OR CONTROL UNIT
To determine if the sensor is defective, the simplest 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.
20
Page 23
R-9HlO
TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER
COMPONENT TEST
(6) Reconnect the oven to the power supply and check the sensor cook operation, proceed as
follows: 6-l. 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 2 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 does not operate properly, the problem is in 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 that is mounted to lowe! portion of control panel. (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: 6-1. Touch SENSOR COOK pad and number 2 pad. 6-2. Touch Start pad. 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
If the above is not the case, the control unit is probably defective. If the above is proper, the AH sensor is probably defective.
Plynger
e
L
NC
NO To Connector (F) on Control Unit
/( CoM
CONNECTOR
2
F- I F-2 F-3
f-
ccd#--) I 4-3 2 +jq---- 3
&ii=
* ;
IL?- -
NCI
RI. R2 : lOOa + 1% 1/2w
R3 : IOkn 5% I/4W R4: 3kn:5% 1/4W
Figure A. Sensor Dummy Resistor Circuit
21
Page 24
OUTLINE OF TOUCH CONTROL PANEL
The touch control section consists of the following units as shown in the control panel circuit.
(1) Key unit (2) Control unit
The principal functions of these units and the signals commu-
nicated 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 Pl , P02, P05, P07, P10,
Pl 1 and P13. 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 (IZA197DR), power source circuit,
synchronizing signal circuit, ACL circuit, buzzer
circuit, temperature measurement circuit, absolute humidity
sensor circuit and indicator circuit.
1) LSI
This LSI controls the temperature measurement signal, AH sensor signal, key strobe signal relay driving signal for oven function and indicator signal.
2) Power Source Circuit This circuit generates the voltages necessary for the control unit from the AC line voltage.
3) Synchronizing Signal Circuit The power source synchronizing signal is available in order to compose a basic standard time in the clock circuit. It incorporates a very small error because it works on
commercial frequency.
4) ACL Circuit
A circuit to generate signals resetting the LSl to the initial
state when power is applied.
5) Buzzer Circuit
The buzzer is responds to signals from the LSI to emit noticeable sounds (key touch sound and completion sound).
6) Temperature Measurement Circuit [ 1 ] : Oven The temperature in the oven cavity is sensed by the ther-
mistor. The variation of resistance according to sensed temperature is detected by the temperature measurement circuit and the result applied to LSI. The LSI uses this information to control the relay and dis-
play units.
7) Absolute Humidity Sensor Circuit
This circuit detects the humidity of the food which is be-
ing cooked, to control its automatic cooking.
8) Stor Switch A switch to “tell” the LSI if the door is open or closed.
9) Relay Circuit To drive the megnetron, heating element, fan motor, convection motor, damper motor and light the oven lamp.
10) 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 6-digits, 15-segments are used for displaying figures.
22
Page 25
R-9HlO
DESCRIPTION OF LSI
7e LSI (IZAl97DR) is detailed in the following table.
LSI (IZA197DR)
The I/O signals of 1
Signal
I/O
Description
Pin No.
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.
-.
IN
Terminal not used. Connected to VC.
IN5
IN4
IN
4
5 input signal which communicates the damper open/close information to LSI.
Damper opened;
“H” level signal (OV: GND)
Damper closed;
“L” level signal (- 5V: VC)
IN
Terminal not used.
6 IN3
7
IN2 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
Used for initial balancing of the bridge circuit (absolute humidity sensor).
This input is an analog input terminal from the AH sensor circuit, and connected to the
A/D converter built into the LSI.
IN
P47
OUT
Used for initial balancing of the bridge circuit (absolute humidity sensor).
P46 OUT
10
11
12
P45
OUT
OUT
13 P44
14
P43 OUT
P42 OUT Timing signal output terminal for temperature measurement (OVEN).
“H” level (GND) : Temperature measurement timing. (Convection cooking)
“L” level (-5V) : Thermistor OPEN timing.
15
23
Page 26
Pin No.
Signal
R-9HlO
16
17
18
19
20
I
21
P4 1
P40
P37
P36
P35
P34
I/O
OUT
OUT
OUT
OUT
OUT
OUT
I
Terminal not used.
Description
Cooling fan motor driving signal.
To turn on and off shut-off relay (RY6).
“L” level during both microwave and con-
vection cooking;
“H” level otherwise.
H GND
DUflng
OFF
-
ON
cookmg
-----L
CONVECTION MOTOR driving signal.
To turn on and off shut-off relay (RY5). “L” level during CONVECTION; “H” level otherwise.
Terminal not used.
Heating element driving signal.
To turn on and off the heater relay (RY3).
“L” level during convection cooking; “H” level otherwise. During convection cooking, the signal becomes
“H” level when the temperature of the
oven cavity exceeds the predetermined temperature.
Oven lamp and turntable motor driving signal (Square waveform: 50Hz).
To turn on and off shut-off relay (RY 1).
-_
The Square waveform voltage is delivered to the RYl driving circuit and relays (RY2, RY3, RY5) control circuit.
4
Durmg cooktng
-
c-r- -- H
-i-
-L
20 tnsec.
c
24
Page 27
R-9HlO
Pin No.
Signal
I/O
Description
22
P33
23
P32
OUT
OUT
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2).
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.
HIGH
MED H,G;’ 24s.~
,
d
MED
I-
MED ,,,i:,2:;$iq
LOW BFIL GND
I-
-l
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 BBC.
-!-
A
2.4 sec.
B
1.2 H CND
C
L
24 P31
IN
Signal to synchronize LSI with commercial power source frequency.
This is the basic timing for all real time processing of LSI.
25
P30
OUT Damper motor relay driving signal.
To turn on and off the shut-off relay (RY4).
H GNO
OFF
ON
.------L
26 CNVSS
IN
Connected to VC.
27
RESET IN Auto-clear terminal.
Signal is input to reset the LSI to the initial state when power is applied. Temporarily set to “L” level the moment power is applied, at this time the LSI is reset. Thereafter set at “H” level.
25
Page 28
R-9HlO
Signal I/O
Description
XIN IN
Internal clock oscillation frequency setting input.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XOUT terminal.
29
XOUT OUT
Internal clock oscillation frequency control output. Output to control oscillation input of XIN.
30
XCIN
IN
Terminal not used.
31
XCOUT
OUT
32
vss
IN Power source voltage: -5V.
VC voltage of power source circuit input.
33
F
34
35
@
OUT
Terminal not used.
R3
IN
Signal coming from touch-key.
When any one of G-l line keys on key matrix is touched, a corresponding signal from POl, POZ, P05, P07, Pl 0, Pl 1 or P13 will be input into R3.
When no key is touched, the signal is held at “L” level.
R2
IN Signal similar to R3.
When any 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 any one of G-3 line keys on key matrix is touched, a corresponding signal will
be input into Rl.
37 RO
IN Signal similar to R3.
When any one of G-4 line keys on key matrix is touched, a corresponding signal will be input into RO.
VP
38
39
40
IN
Anode (segment) of Fluorescent Display light-up voltage: -28V VP voltage of power source circuit input.
P17 OUT Terminal not used.
P16
OUT Segment data signals.
The relation between signals and indicators are as follows:
Signal Segment
Signal
Segment
Pl6.
................ .LR2
PO2.
................. g
P14.
................ .Ul32
PO1
.................. f
P13.
................
.LBl
POO.
................. e
Pll..
............... .lJBl P26.
................. d
PlO.. ................
k
P25.
................. c
P07.
................. j P23.
................. b
P05.
................. i P22.
................. a
P04.. ................
h
(50Hzl
\
-J-u-r::;
26
Page 29
R-9HlO
Pin No,
41
42
43
44
45
46
47
48
Signal
P15
P14
P13
P12
Pll
PlO
PO7
PO6
I/O
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
Description
Digit selection signal. The relationship between digit signal and digit are as follows;
Digit signal
digit
P15 . . . . . . . . . . ..*............. 1st
---- ---- --__ ----C&JO
P12 . . . . . . . . . . ..I.............
2nd
PO6
. . . . . . . . . . . . . . . . . . . . . . . . . .
3rd
PO3
. . . . . . . . . . ..a.............
4th
P27
. . . . . . . ..*................
5th
PO6 n
P24 . . . . . . . . . . . . . . . . . . . . . . . . . . 6th
PO3 n
Normally, one pulse is output in every I3 period, and input to the grid of the
P27 n .
Fluorescent Display.
P24 d
1) Segment data signal. Signal similar to P16.
1) Segment data signal. Signal similar to P16.
2) Key strobe signal. 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.
Digit selection signal. Signal similar to P15.
1) Segment data signal.
Signal similar to P16.
2) Key strobe signal. 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.
1) Segment data signal. Signal similar to P16.
2) Key strobe signal. Signal applied to touch-key section.
A pulse signal is input to RO-R3 terminal while one of G-9 line keys on key matrix is touched.
1) Segment data signal. Signal similar to P16.
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.
Digit selection signal. Signal similar to Pl5.
27
Page 30
-
R-9HlO
Pin No. Signal
I/O
49
PO5
OUT
50
PO4 OUT
51
PO3
OUT
52
PO2 OUT
53 PO1 OUT
54 PO0
55 P27
56
P26
57
P25
58
P24
OUT
OUT
OUT
OUT
OUT
59
P23
60
P22
OUT Segment data signal.
~ Signal similar to P16.
OUT
61
P21
62
P20
63
AVCC
64
vss
OUT
IN
IN
IN
Description
1) Segment data signal. Signal similar to P16.
2) Key strobe signal. Signal applied to touch-key section.
A pulse signal is input to RO-R3 terminal while one of G-7 line keys on key
matrix is touched.
1) Segment data signal. Signal similar to P16.
Digit selection signal. Signal similar to P15.
1) Segment data signal. Signal similar to P16.
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.
1) Segment data signal.
Signal similar to P16.
2) Key strobe signal.
Signal applied to touch-key section.
A pulse signal is input to RO-R3 terminal while one of G-5 line keys on key
matrix is touched.
1) Segment data signal.
Signal similar to P16.
Digit selection signal.
Signal similar to P15.
1) Segment data signal. Signal similar to P16.
Digit selection signal. Signal similar to P15.
Terminal not used.
Input signal which communicates the door open/close information to LSI. Door closed;
“H” level signal (OV)
Door opened;
“L” level signal (-- 5V)
Connected to GND.
Connected to GND.
28
Page 31
ABSOLUTE HUMIDITY SENSOR CIRCUIT
(1) Structure of Absolute Humidity Sensor
The absolute humidity sensor includes two thermistors as shown in the illustration. One thermistor is housed in the closed vessel filled with dry air while another is in an open vessel. Each sensor is provided with the protective cover made of metal mesh to protect it from the external airflow.
Sensing part Sensing part (Open vessel 1 (Closed vessel 1
(2) Operational Principle of Absolute Humidity
Sensor
The figure below shows the basic structure of an
absolute humidity sensor.
A bridge circuit is
formed by two thermistors and two resistors (RI
and R2).
The output of the bridge circuit is amplified by the
operational amplifier. Each thermistor is supplied with a current to keep
*it heated at about 150 “C (302 OF), the resultant
heat is dissipated in the air and if the two thermistors are placed in different humidity condi­tions they show different degrees of heat conductivity leading to a potential difference be­tween them causing an output voltage from the bridge circuit, the intensity of which is increased as the absolute humidity of the air increases. Since the output is very minute, it is amplified by the operational amplifier.
Operational amplifier C
R,
T
is”i!l
i
­8 *u
s: : RI
+
%a”,“e’
P-
S: Thermistor
open vessel
R3 u
C: Thermistor
closed vow
t
Absolute humidity vs. output voltage characteristis
Absolute humidity (g/m’ 1
(3)Detector Circuit of Absolute Humidity Sen-
sor Circuit
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, a 16 second clearing cycle occurs than 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 both the F-3 terminal of the absolute humidity sensor and IN0 terminal of the
LSI. The voltage of IN1 terminal will 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 IN1 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 sensor cooking; thereafter, the unit goes in the next 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 not possible to balance, of the bridge circuit due to disconnection of the absolute humidity sensor, ERROR will an­pear on the display and the cooking is stopFed. ’
( D72QOlU)
1 )Absolute humidity sensor circuit
C
Thermamtar In closed v.sseI
5
Tharmfslor In op.” P.S..,
R50 Rdatof block
SW4 1
P441
sw59.
P43 ---01
-1
IN0
LSI
( IC 11
IN1
VA:‘-1 5V
2)lnternal equivalent circuit of I2
CH1
CH2
Top View
29
Page 32
R-9HlO
SERVICING
I, Precautions for Handling Electronic
Components
This unit uses PMOS LSI in the integral part of the circuits. When handling these parts, the following
precautions should be strictly followed. PMOS LSI have extremely high impedance at its
input and output terminals. For this reason, it is easily influenced by the surrounding high voltage power source, static electricity charge in clothes, etc,and sometimes it is not fully protected by the built-in protection circuit. In order to protect PMOS LSI.
1)
2)
When storing and transporting, thoroughly wrap them in aluminum foil. Also wrap all PW boards containing them in aluminium foil. When soldering, ground the technician as shown in the figure
and use grounded
soldering iron and work table.
/
approx. 1 MR
h
d7
2. Shapes of Electronic Components
Transcstor 2SB793
Tramstor DTD143EA
TransMor DTA143ES DTAl14YS DTBl43ES DTCll4ES 2SA933S
3. Servicing of Touch Control Panel
We describe the procedures to permit servicing of the touch control panel of the microwave oven and the precautions you must take when doing so. To perform the servicing, power to the touch con­trol panel is available either from the power line of
the oven itself or from an external power source.
(1) Servicing the touch control panel with
power supply of the oven:
CAUTION: THE HIGH VOLTAGE TRANSFORMER OF THE MICROWAVE OVEN IS STILL LIVE
DURING SERVICING PRESENT A HAZ­ARD.
Therefore, when checking the performance of the touch control panel,put the outer cabinet on the oven to avoid touching the high voltage transformer, or unplug the primary terminal
(connector) of the high voltage transformer to
turn it off; the end of such connector shall be
insulated with an insulating tape. After servic­ing, be sure to replace the leads to their original
locations.
A. On some models, the power supply cord be-
tween the touch control panel and the oven it­self is so short that the two can’t be separated.
4.
Servicing Tools
Tools required to service the touch control panel assembly.
5.
1) Soldering iron: 30W (It is recommended to use a soldering iron with a
grounding terminal.)
2) Oscilloscope: Single beam, frequency range: DC
- IOMHz type or more ad-
vanced model.
3) Others: Hand tools
Other Precautions
For those models, check and repair all the controls (sensor-related ones included) of the touch control panel while keeping it connected to the oven.
B. On some models, the power supply cord be-
tween the touch control panel and the oven proper is long enough that they may be sepa­rated from each other.
For those models, therefore, it is possible to check and repair 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 stop switch (on PWB) of the touch control panel with a jumper, which brings about an opera­tional state that is equivalent to the oven door being closed. As for the sensor-related controls of the touch control panel, checking them is possible if dummy resistor(s) with resistance equal to that of the controls are used.
(2) Servicing the touch control panel with
power supply from an external power source:
Disconnect the touch control panel completely from the oven proper,and short both ends of
the stop switch (on PWB) of the touch control
panel,which brings about an operational state
that is equivalent to the oven door being closed. Connect an external power source to the power input terminal of the touch control panel, then it is possible to check and repair the controls of the touch control panel; it is also possible to ‘check the sensor-related controls of the touch control panel by using the dummy resistor(s).
1)
2)
3)
4)
5)
Before turning on the power source of the control unit, remove the aluminum foil applied for preventing static electricity. Connect the connector of the key unit to the control unit being sure that the lead wires are not twisted.
After aluminum foil is removed, be careful that abnormal voltage due to static electricity etc. is not applied to the input or output terminals.
Attach connectors, electrolytic capacitors, etc. to PWB, making sure that all connections are tight.
Be sure to use specified components where
high precision is required.
(RD94ZE2U)
30
Page 33
R-9HlO
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
WARNING: To avoid possible exposure to microwave
energy;
A. Before operating the oven
1. Make sure that unlatching the door slowly is accompanied by a click indicating actuation of the monitor switch and latch switches.
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 is 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
1. 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;
I. Disconnect oven from power supply.
2. ’ Remove eight (8) screws from the rear and along the side edge of the case.
3. Remove the two (2) screws (LHSTIX LR-4) from the lower portion of the oven cabinet back side.
4. Slide the entire case back about 3 cm to free it from retaining clip on the cavity face plate.
5. Lift the entire case from the unit.
CAUTION: DISCHARGE THE HIGH VOLTAGE
CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR
WIRING.
NOTE: THE OUTER CASE CABINET IS SECURED
BY SPECIAL (LH) SCREW. WHEN SE­CURING OR LOOSENING THE SCREW, LHSTIX (LR-4) TYPE SCREW DRIVER SHOULD BE USED.
LHiTIX SCREW DRIVER
LHSTIX SCREW
(SIZE LR-4)
LHSTIX SCREW DRIVER AND LHSTIX SCREW
p-00
0
-
\
f
\
c=-===r
I
El
0
Q
P
ml*
REMOVAL OF LHTIXS.S;;EW AT OVEN BACK
31
Page 34
-~
R-9HlO
POWER TRANSFORMER REMOVAL
I. Disconnect oven from power supply and remove
outer case.
2. Discharge high voltage capacitor.
3. Disconnect filament leads of transformer from the magnetron and capacitor.
4. Disconnect high voltage lead of capacitor from the transformer.
5. Disconnect wire leads from the transformer.
6. Remove two (2) screws and one (1) washer hold-
ing the transformer to the base cabinet.
Re-install
1. Rest the transformer on the base cabinet with its primary terminals toward rear cabinet.
2. Insert the two edges of the transformer into two metal tabs of the base cabinet.
3. Make sure the transformer is mounted correctly
to the corners underneath those tabs.
4. After re-installing the transformer, secure the transformer with two screws to the bate cabint, one is with outertooth washer and the other is without outer-tooth washer.
5. 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”.
6. Re-install the outer case and check that the oven is operating properly.
NOTE; LIVE(ORANGE) WIRE MUST BE CON-
NECTED TO THE CABINET-SIDE OF
THE POWER TRANSFORMER.
ASYMMETRIC RECTIFIER AND H.V.RECTIFIER ASS’Y REMOVAL
1. Disconnect oven from power suppply and remove CAUTION: WHEN REPLACING THE RECTIFIER outer case.
ASSEMBLY, THE GROUND SIDE
2. Discharge the high voltage capacitor. TERMINAL MUST BE SECURED
3. Remove one (1) screw holding the H.V. rectifier
FIRMLY WITH A GROUNDING
terminal to the capacitor holder.
SCREW.
4. Disconnect the rectifier assembly from the capacitor.
HIGH VOLTAGE CAPACITOR REMOVAL
I. Disconnect oven from power supply and remove
outer case.
2. Discharge the high voltage capacitor.
3. Disconnect the high voltage wire leads and rectifier
assembly from high voltage capacitor and magnetron.
4. Disconnect filament lead of tramsformer from high voltage capacitor.
5. Disconnect high voltage wire lead of capacitor from transformer.
6. Remove one (1) screw and washer holding the rectifier from the capacitor holder.
7. Remove one (1) screw holding the capacitor holder to the rear cabinet.
8. Remove the capacitor from the holder.
TURNTABLE MOTOR AND/OR COUPLING REMOVAL
1. Disconnect the oven from power supply.
2. Remove one (1) screw holding the turntable motor cover to the base cabinet and take off the turntable motor cover.
3. Disconnect wire lead from the turntable motor.
4. Remove the two (2) screws holding the turntable motor to the mounting plate of the oven cavity bottom.
5. Pull the turntable coupling out of the oven cavity.
6. Turntable coupling and turntable motor will be free.
32
Page 35
R-9HlO
MAGNETRON REMOVAL
1.
2.
3.
4.
5.
1.
2.
3.
4.
I.
;:
4.
1.
2.
3.
4.
1.
2.
3.
4.
5.
Disconnect oven from power supply and remove
when removing the screws holding the magnetron
outer case.
Discharge the high voltage capacitor. Disconnect
filament lead of transformer from magnetron.
Disconnect high voltage wire lead from magnetron. Disconnect heater leads from the magnetron. Take off three (3) screws secured the chassis support to oven cavitv-and waveauide. Remove cooling fan “ass’y refer to “Cooling Fan
Removal” No.6 to 7.
and air guide to prevent it from falling.
6. Remove 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.
Carefully remove four (4) mounting screws hold the magnetron and magnetron air guide to waveguide,
COOLING FAN MOTOR WITH FAN THERMAL CUT-OUT REMOVAL
Disconnect oven from power supply and remove
outer case.
Discharge the high voltage capacitor. Disconnect wire leads from the cooling fan motor
‘and fan thermal cut-out.
Remove three (3) screws holding the chassis sup­port to rear cabinet, control panel back plate and wave guide.
5.
6.
7.
8
Release one (1) tab holding cooling fan duct to air
guide.
Remove cooling duct and fan motor ass’y from unit.
The cooling fan motor assembly is now free.
Remove fan blade from fan motor shaft by pulling
fan retainer clip.
Remove two (2) screws and nuts holding cooling fan motor and fan thermal cut-out . The cooling fan motor ass’y is now free.
CONVECTION MOTOR REMOVAL
Disconnect oven from power supply and remove
outer case.
Discharge the high voltage capacitor. Disconnect wire leads from the convection motor. Remove the convection fan belt and pulley(M).
Remove two (2) screws holding the convection motor mounting angle to the heater duct and base cabinet.
5.
6.
7.
Take out the convection motor assembly from the unit. The convection motor assembly is now free.
Remove two (2) screws and nuts holding the motor to mounting angle. Convection motor is now free.
DAMPER ASSEMBLY REMOVAL
Disconnect oven from power supply and remove outer case. Discharge the high voltage capacitor. Remove cooling fan motor and magnetron refer to “Cooling Fan Motor Removal” and “Magnetrom Removal”. Disconnect wire leads from damper motor and damper switch.
5. Remove two(2) ovenside screws holding damper motor angle to thermal protection plate (right).
6. Damper assembly is free.
7. Remove one (1) screw holding damper motor to damper motor angle and one (1) screw holding damper switch to damper motor angle.
8. Damper motor and switch are free.
HEATER UNIT ASSEMBLY REMOVAL
(HEATING ELEMENT/THERMISTOR)
Disconnect oven from power supply and remove
6.
outer case cabinet. Discharge the high voltage capacitor. Disconnect wire leads from oven thermal cut-out,
convection motor, thermistor and heater element.
Remove convection motor ass’y refer to “Con-
vection Motor Removal No.3 to No.5”.
Remove eleven (I 1) screws holding heater duct to
the oven cavity.
Release two (2) snap bands holding wire harness
to the thermal protection plate (left).
1.
2.
3.
4.
3.
The heater unit is now free.
HEATING ELEMENT AND THERMISTOR
Remove two (2) screws holding heating element to heater duct. Loosen two (2) screws holding holders to heater duct and take heating element out of heating ele­ment holders. Heating element is free. Remove two (2) screws holding thermistor to heater duct. Thermistor is free.
33
Page 36
R-9H10
OVEN LAMP/SOCKET ASSEMBLY REMOVAL
1. Disconnect oven from power supply and remove
NOTE; NEUTRAL(WHITE) WIRES MUST BE
outer case cabinet.
CONNECTED TO THE TERMINAL WITH
2. Disconnect wire leads from lamp socket.
‘N’ MARK ON LAMP SOCKET.
3. Remove two(2) screws holding oven lamp to the lamp mounting angle.
STOP SWITCH, UPPER LATCH SWITCH, LOWER LATCH SWITCH AND
MONITOR SWITCH REMOVAL
1. Disconnect oven from power supply and remove outer case.
2. Remove control panel assembly, refer to “Control Panel Removal”.
3. Discharge high voltage capacitor.
4. Disconnect wire leads from each of the switches.
5. Remove two (2) screws holding latch hook to oven
flange.
6. Remove latch hook assembly from oven flange.
7. Push downward on the one (1) stopper tabs hold­ing each of the switches place.
8. Switches are free.
At this time latch lever will be free, do not lose it.
Re-install
1. Re-install latch lever and each switch in its place, refer to Figure C-l.
2. Re-connect the wire leads to each switches and fuse holder. Refer to the pictorial diagram.
3. Secure the latch hook (with two (2) mounting screws) to the oven flange.
4. Make sure that monitor switch is operating properly.
Refer to chapter “Test Procedure” and Adjustment
procedure.
STOP SWITCH, UPPER LATCH SWITCH, LOWER LATCH SWITCH AND
MONITOR SWITCH ADJUSTMENT
moving it back and forth and then adjust the latch hook by moving it back and forth. In and out play of the door allowed by the latch hook should be less
than 0.5 mm.
3. Secure the screws with washers firmly.
4. Now, make sure of the upper and lower latch switches operations. If these latch switches are not activated with the door closed, loose the screws holding the latch hook to the oven cavity front flange and adjust the latch hook position.
After the adjustment, make sure of the following:
1. The in and out play of the door remains less than
0.5 mm at latched position.
2. The upper and lower latch switches interrupt the circuit before the door can be opened.
3.. The monitor switch contacts close when the door is opened.
4. Re-install the outer case and check for microwave leakage around the door with an approved micro-
wave survey meter. (Refer to Microwave Measure­ment Procedure.)
\
If those switches do not operate properly due to a mis-adjustment, the following adjustment should be made.
1. Loosen the two (2) screws holding the latch hook to the flange on the oven front face.
2. With the door closed, adjust the latch hook by
\,.
‘\
, LATCH
/ 5 HOOK
LATCH HEAD
SWITCH
Figure C-l. Latch Switches Adjustment
34
Page 37
CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVAL
To remove the control panel, proceed as follows:
Replacement of individual component is as follows:
1.
2.
3.
4.
5.
6.
7.
Disconnect oven from power supply and remove
outer case.
Discharge the high voltage capacitor. Disconnect connector CN-A, CN-E, CN-B, CN-F,
TABI, TAB2 and TAB3 from the control unit.
Remove one (1) screw holding the control panel back plate to the chassis support. Remove the two (2) screws holding the bottom
edge of the back plate to the cabinet base.
Remove one (1) screw holding the back plate to the
oven cavity flange.
Lift up and pull the control panel forward.
Disconnect the wire connector from the control unit.
CONTROL UNIT AND KEY UNIT
1.
2.
3
4:
5.
6.
Remove the four (4) screws holding the panel
frame to the back plate.
Separate the panel frame and back plate. Remove the five (5) screws holding the control unit
to the panel frame.
Lift up the control unit and disconnect the key
connector from the control unit.
Now, the control unit and frame assembly are sep­arated.
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.
2. Insert an putty knife (thickness of about 0.5mm) into the gap between the choke cover and corner portion of door panel as shown figure C-3 to free
As the engaging part of choke cover and door
engaging parts.
Note:
panel are provided at several places, do not force any particular part.
3. Lift up choke cover.
4. Now choke cover is free from door panel.
Q LIFT UP
0
PUTTY KNIFE
CHOKE COVER
UPPER
LOWER
Figure C-2. Door Disassembly
35
Page 38
R-9HlO
DOOR REPLACEMENT AND ADJUSTMENT
DOOR REPLACEMENT
1. Disconnect oven from power supply and remove outer case.
Remove turntable tray and roller stay from oven
cavity.
2. Remove three (3) screws holding lower oven hinge.
3. Remove lower oven hinge from oven cavity bottom flange.
4. Remove door assembly from upper oven hinge on the oven.
5. Door assembly is now free.
Note: When individual parts are replaced, refer to
“Door Disassembly”.
6. On re-installing door, insert the upper oven hinge
into the door hinge pin.
Then while holding door in place.
7. Make sure door is parallel with oven face lines (left and upper side lines) and the door latch heads pass through the latch holes correctly.
8. Insert the lower oven hinge into oven cavity bottom flange and then engage the door hinge pin. Then secure the lower oven hinge firmly with three
(3) mounting screws. Note: After any service to the door; (A) Make sure that the upper and lower latch
switches are operating properly. (Refer to chapter “Test Procedures”.)
(B) An approved microwave survey meter should
be used to assure compliance with proper microwave
radiation
emission
limitation
standards.
DOOR ADJUSTMENT
The door is adjusted by keeping the screws of each
hinge loose. The lower oven hinge can be loosened.
After adjustment, make sure of the following :
1. Door latch heads smoothly catch the latch hook through the latch holes, and the latch head goes through the center of the latch hole.
2. Deviation of the door alignment from horizontal line of cavity face plate is to be less than 1 .Omm.
3. The door is positioned with its face depressed to­ward the cavity face plate.
4. Re-install outer case and check for microwave
leakage around the door with an approved micro-
wave 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.
RE - INSTALL )
36
Page 39
R-9HlO
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 per­formance standard for microwave ovens must be
used for testing.
2.
3.
4.
5.
6.
Recommended instruments are: NARDA 8100 NARDA 8200 HOLADAY HI 1500 A
SIMPSON 380M
Place the oven tray into the oven cavity. Place the load of 275 sfrl5ml of water initially at
20 +5 “C in the center of the oven tray. The water container should be a low form of 600 ml beaker with inside diameter of approx. 8.5cm and made of an electrically non-conductive material such as glass or plastic. The placing of this standard load in the oven is 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 meas­ured at any point of 5cm or more from the external surface of the oven.
(RDB1103U)
37
Page 40
I
R-9HlO
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Page 42
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Page 43
R-9HlO
PARTS LIST
Note : The voltage supplied to the parts “*I’ are greater than 250V.
REF. NO.
PART NO.
I
DESCRIPTION
1 cuy ICODE
ELECTRICAL PARTS
l- 1
FH-DZA005WREO
I- 2
FH-HZAOlOWREO
l- 3
QACCAA020WREO
l- 4
QFS-CAOlOWREO
l- 5
OFS-TA004WREO
High voltage rectifier ass'y Thermistor ass'y Power supply cord Fuse (M8A)
Oven temp.
fuse 145 OC
Fuse holder Oven lamp socket
Monitor switch (V-5220D-070)
Stop switch (V-ll-3C25(RB)) Upper & lower latch switches(V-5230D-600)
High voltage capacitor Convection heater Oven lamp Damper motor Turntable motor
Cooling fan motor Convection motor
Monitor resistor
0.8 n 2ow Oven therm0 cut-out Fan therm0 cut-out
1 1' 1 1
1 1
1 1 2
2 1
1 1 1 1
1 1
1 1 1
1 1 1
1 1 1 1 1
4'
1 1 1
1
1
1
1
1
1 1 1 1 1
1 3 1 2 1
2 1 7
2 1
AQ
AL AQ
AE AG
AE AH AF AE
AF AV
AW AK
AQ
AV
-­AW AV
AG AG AG
BN BG AY
l- 6
QFSHDAOO2WREO
l- 7
QSOCLAOOlWREO
l- 8
QSW-MA009WREO
l- 9
QSW-MA037WREO
l-10
QSW-MAOSlWREO
1-11
RC-QZA068WREO
l-12
RHET-A048WREO
l-i3
RLMPTA029WREO
1-14
RMOTDA043WREO
l-15
RMOTDA097WREO
l-16
RMOTEA017WREO
l-17
RMOTEA124WREO
l-18
RR-WZA003WREO
l-19
RTHM-A024WREO
l-20
RTHM-A034WREO
l-21
RTRN-A215WREO Power transformer
l-22
RV-MZA074WREO Magnetron
1-23
FDTCTA077WRKO AH sensor
CABINET PARTS
2- 6
GFTARAOOlWRWO
2- 7
GLEGPA013WREO
2- 8
LANGK0243WRPO
2- 9
LBSHC0032WREO
2-10
LSTPP0008YBFO
FDAI-A095WRYO
Base plate assy FHNG-A092WRMO Oven hinge (lower) GCABDA037WRWO
Rear cabinet
GCABUA227WRPO
Outer case cabinet
GCOVHA156WRPO
Turntable motor cover
Oven lamp access cover
Foot Capacitor holder Cord bushing Cord anchorage (upper)
Cord anchorage
(lower)
Latch lever
Cabinet cushion
Latch hook
Schematic diagram
2-11
LSTPP0009YBFO
2-12
MLEVPA122WRFO
2-13
PCUSGA023WRPO
2-14
PHOK-A043WRFO
2-15
TMAPCA471WRRO
2- 1 2- 2
;r ;
2- 5
AW AF AT BB AB
/
AC AB AC AB AC
AC AD AA AM AC
CONTROL PANEL PARTS
CPWBFA214WRKO Control unit
>ivcu, QPLGJ2326DREO 3-pin connector (A) QCNCMA078DREO 4--pin connector (B) QCNCMAO4ODREO 6-pin connector (E)
QCNCMAO9ODREO 3-pin connector (F) QCNCWA030DREO 12-pin connector (G)
QLUGPA004DREO Tab terminal (TABl,TAB2,TAB3) RV-KXA012DREO Fluorescent display tube RC-KZA032DREO Capacitor 0.1 ~.IF 50V RC-EZA192DREO Capacitor 1000 PF 35V
VCEAB31HW335M Capacitor
3.3 FF 50V
VCEAB31CW476M Capacitor
47 I.~F :.6V
VCKYDllCY103N Capacitor
0.01 FF 16V
BS AD AD AC AB
AE AA AX AB AD
AA AA AA
AB AA
3- 1 3- 1A 3- 1B 3- 1c 3- 1D
3- 1E 3- 1F 3- 1G Cl,21 c2
C3,81 ­c5 C6,7,20,
c51,5; C60,61
C8,50 Cl0
RC-KZ104QDREO Capacitor
0.1 ~.IF 25V
VCEAB31EW226M Capacitor 22 PF 25V
41
Page 44
R-9HlO
Note : The voltage supplied to the parts “*I’ are greater than 250V.
REF. NO.
PART NO.
DESCRIPTION
Q’TY
CODI
c53
VCKYBllEX153N Capacitor 0.015 pF 25V
1 AA
c70
RC-KZA039DREO Capacitor
0.015 FF 5OV
1 AA
C80
VCEAB31HW474M Capacitor
0.47 pF 50V
1 AA
CFI
RCRS-AOlODREO Ceramic filter (4.00MHz)
1
AD
Dl-5
VHDllESl///-1 Diode (11ESl)
5
AB
_-- -- ______.
D7,51,
VHDlSS270A/-1Diode (lSS270A)
20
AA
D52,70, D80-88, D93-99
Fl
QFS-AA005DREO Fuse (ICP-NlOS)
1
AE
--~
--~
_--__ - ------
____-. -__--~
ICl
RH-IZA197DREO LSi
1 AW
IC2
VHIIR94558/-4 IC IR94558
1
AD
Ql
VS2SB793///-4 Transistor 2SB793(R,S)
1
AC
Q20,40
VSDTA143ES/lB Transistor DTA143ES
5
AB
Q84-86
_____-
--
__-.____ ~-.-__--
Q30
RH-TZA063DREO Transistor 2SA933S
1
AB
;z
VSDTC114ES/-3 Transistor DTC114ES
1 AB
VSDTD143EA/-4 Transistor DTD143EA
1 AC
Q8l
VSDTA114YS/-3 Transistor DTAll4YS
AB
Q82,83
RH-TZA097DREO Transistor DTB143ES
2" AC
___-
_~.__
Rl
VRD-B12EF471J Resistor
470 R 1/4w
1 _ AA
R2
VRD-B12HF331J Resistor
330 R 1/2w
1
AA
R3,60,
VRD-B12EF102J Resistor lk R 1/4W
5
AA R70,80, R201
R4
VRD-B12HF751JResistor
750 n 1/2w
1
AA
R5,20
VRD-B12EF153J Resistor 15k n 1/4W
2 AA
RlO
VRD-B12HF360J Resistor
36 R 1/2W
1
AA
R40,
VRD-B12EF332JResistor 3.3k n 1/4W
12 AA
R93-103
R50
RR-DZA069DREO Resistor block
1 AD
R51 VRS-B13AA331J Resistor
330 n 1w
1
AA
R52
VRN-B12EK182F Resistor 1.8k n (F) 1/4W
1
AA
R53
VRN-B12EK364F Resistor
360k n (F) 1/4W
1 AA
R54
VRD-B12EF103J Resistor
10k n 1/4W
1
AA
R55
VRD-B12EF473J Resistor
47k n i,'4W
1 AA
R61,202 VRD-B12EF273J Resistor
27k R 1/4W
2
AA
R62 VRN-B12EK753F Resistor
75k R (F) 1/4W
1 AA
R63
VRN-B12EKlOlF Resistor 100 n (F) 1/4W
1
AA
R64 VRN-B12EK222F Resistor
2.2k n (F) 1/4W
1
AA
R81,86 VRD-B12EF680J Resistor
68 n 1/4w
2
AA
R200 VRD-B12EF105J Resistor 1M n 1/4W
AA
RY1,4-6 RRLY-A020DREO Relay (OJSH112LM)
4" AH
RY2 RRLY-2118DRE0 Relay (VS12SMBU)
1 AM
RY3 RRLY-A013DREO Relay (OMI-SH112D) 1 AM SP40 RALM-A007DREO Buzzer (PKM22EPT) 1
AF I1 RTRNPA023DREO Transformer 1 AR VRSl
RH-VZAOlODREO Varistor (15G471K) 1
AE ZDl
VHERDlGEB3/-1Zener diode (RD16EB3) 1 AB
ZD3
RH-EZA105DREO Zener diode (RD4.3ESB2) 1 AA
;I '3
\-
FPNLCA587WRKO Control panel flame with key unit
,ni i;
1
BA
JBTN-A315WRFO Open button 1 AC
3- 4
MSPRDA009WREO Open button spring 1 AA
3- 5
LANGTA197WRWO Control panel back plate
1 AK
3- 6
MLEVFA042WRWO Open lever
1
AC 3- 7
NSFTTA030WREO Open shaft
1 AB
;I g
XHPSD30P12XSO Screw;control unit mtg.
3 AA
XCPSD40P12000 Screw;control panel back plate mtg.
4 AA
OVEN PARTS
4- 1
FBRGMA002WREO Bearing ass'y
1
4- 2
AQ
FDUC-A124WRWO Steam duct ass'y
1
AN
4- 3
FFANJ0034WRKO Cooling fan ass'y
1 AF
4- 4
FFTA-A022WRKO Damper ass'y
1 AE
4- 5
FOVN-A144WRYO Oven cavity
1
-
BQ
;I ;
FROLPA032WRKO Roller stay
1 AP
LANGFA089WRWO Chassis support
1 AE
4- 8
LANGQA136WRWO Convection motor mounting plate
1 AE
42
Page 45
R-9HlO
The vnltme sklnnlied tn the narts “*w are areater than 3%X/
Note : . ..- __.__ ~- --rT ..-- _- - .-
r -.-- -. - a- ----- -..-.. --- _.
REF. NO.
PART NO.
DESCRIPTION
Q’TY
COD1
4- 9 LANGQA157WRWO
Lamp socket mounting angle
1
AF
4-10
LANGQA163WRPO Thermal cut-out mounting angle
1
AB
4-11
LANGTA196WRWO Bearing mounting plate
AD
4-12
LBNDK0054WREO Heater element holder
2" AB
4-13 LFIX-A013WRWO
Bearing holder plate
1 AB
4-14 LHLDK0005YBFO
Cord holder
1 AB
4-15 MCAMPA030WRFO
Damper cam
1
AC
4-16 MHNG-A165WRMO Oven hinge (upper)
1
AE
4-17 NBLTKA005WREO
Convection fan belt 1
AF
4-18 NCPL-A021WRFO
Turntable coupling
1
AE
4-19 NFANMA019WRWO
Convection fan
1 AE
4-20 NPLYBA025WRFO
Pulley (M)
1
AC
4-21 NPLYBA025WRFO
Pulley (M)
1 AC
4-22 NSFTTA043WREO
Damper shaft
1
AA
4-23
NTNT-A019WRHO Turntable tray '1
AT
4-24
PCOVPA157WREO Waveg-uide cover
4-25 PCOVPA167WRFO
AH sensor cover
1
AD AC
4-26
PCUSGA211WRPO Transformer cushion D
AB
4-27 PCUSUA146WRPO
Magnetron duct cushion :
AA
4-28 PCUSU0263WRPO
Cushion
2 AA
4-29 PCUSU0329WRPO
Cushion
1
AA
4-30 PCUSU0380WRPO Steam cushion C
2
AA
4-31 PDUC-A267WRPO
Heater duct 1
AN
4-32 PDUC-A269WRWO
Damper duct
1
AK
4-33 PDUC-A270WRFO Cooling fan duct
1
AL
4-34
PFPF-A049WREO Thermal protection sheet (left) 1
AN
4-35
PREFHA028WRPO Thermal protection plate (left)
1 AM 4-36 PFPF-A050WREO Thermal protection sheet (right) 1 AK 4-37 PGLSPA181WREO Oven lamp screen
1
AG
4-38
PREFHA027WRPO Thermal protection plate (right) 1 AL
4-39 PSKR-A151WRWO Air guide (A)
1
AD
4-40 PSKR-A152WRPO
Air guide (B) 1
AB
4-41 PSKR-A153WRPO
Air guide (bottom)
1
AF
4-42 PSKR-A156WRPO
Air guide (C) 1
AB
4-43 PSKR-AlGlWRWO
Air guide (right)
1
AF
4-44 PSKR-A171WRPO
Magnetron air guide
1
AD
4-45 PCUSGA221WRPO
Cushion 1
AB
* *
DOOR PARTS
5
CDORFA357WRKO Door assembly, complete
BN
5- 1 DDORFA262WRYO
Door panel
:: BH
z- - 2 3 GCOVHA155WRFO Choke cover
1
AP
GWAKPAllOWRFO Door frame
1
AT
5- 4 HDECQA107WRFO Door sash (right)
1
AF
:- - 5 6 HDECQA108WRFO
Door sash (left)
AF
LSTPPA045WRFO Upper latch head t AB
5- 7 LSTPPA046WRFO
Lower latch head
1
AB
5- 8 MSPRTA007WREO
Latch spring
1
AB
5- 9 NSFTTA044WREO Latch shaft
1
AC
5-10 PGLSPA180WREO
Door glass
1 AX
MISCELLANEOUS
6- 1 FAMI-A024WREO
High rack 1
AQ
6- 2 FAMI-A025WREO
Low rack
1
AQ
6- 3 TCADCA220WRRO
Cook book'{Convection cooking)
AM
TCADCA226WRRO Cook book(Microwave cooking) t AY
6- 4 TINSEA430WRRO
Operation manual
1
AF
66: 2 LBNDK0012YBEO
Wire holder (WH-1 84mm ) 1
AA
FW-VZA664WREO Main wire harness
1 AX
6- 7 QW-QZA099WREO
High voltage wire A
1
AD
6- 8
QW-QZAlOOWREO High voltage wire B
AD
6- 9 FW-VZA591WREO Thermistor harness
:
AM
6-10 TLABSA018WRRO Fuse label
1
AB 6-11 LHLDWQ004YBEO Wire holder (purse lock "L") 1 AA 6-12 QTANP0020YBEO
Connector CE-230
1 AA
6-13 TCAUH0114WRRO Caution label
1
AC
43
Page 46
R-9HlO
\
Note :
The voltage supplied to the parts rr*rr are greater than 250V.
REF. NO.
PARTNO.
DESCRIPTION
Q'TY
CODE
6-14
TSPCNA984WRRO Name plate
1 AC
SCREW,NUTS,WASHERSAND PINS
7- 1
LX-BZ0186WREO Screw;
high voltage rectifier ass'y,
5
AA
convection motor ass'y,
monitor resister,
turntable motor covering
and oven lamp access cover mtg.
7- 2
LX-BZ0202WREO Screw; upper
& lower latch heads mtg.
2 AB
7- 3
LX-CZA020WREO Screw; oven hingescupper
& lower) mtg.
6
AA
7- 4
LX-CZ0017WREO Screw; heater element holders, thermister ass'y,
8
AA
air guide (A), (B) and (C) mtg.
7- 5
LX-CZ0043WREO Screw;
thermal protection plate(left), bearing holder plate and
convection motor ass'y mtg.
7- 6
LX-CZ0052WREO Screw; latch hook mtg.
2
AA
7- 7
LX-EZA034WREO Screw; (LHSTIX LR-4) outer case cabinet mtg.
2
AB
7- 8
LX-NZ0029YREO Screw;
steam duct ass'y mtg.
1 AA
7- 9
XBPSD30P14KOO Screw; damper switch mtg.
1
AA
7-10
XBPSD40P06KOO Screw;
convection motor ass'y mtg.
2
A*A
7-11 XBPSD40P25000 Screw;
cooling fan motor mtg.
2 AA
7-12
XFPSD40P30000 Screw; cord anchorages mtg.
AA
7-13
XBTUW40P06000 Screw; waveguide cover mtg.
; AA
7-14
XBTUW40P08000 Screw; heater unit ass'y, steam duct,
14
AA
oven lamp mounting angle,
bearing mounting plate and
convection heater mtg.
7-15
XCPSD30P06000 Screw; damper motor, oven therm0 cut-out
5
AA
and fan therm0 cut-out mtg.
7-16
XCPSD30P08XSO Screw;
oven lamp socket mtg.
AA
7-17
XCPSD30P08XOO Screw;
door flame and door sash(left) mtg.
: AA
7-18
XCPSD30P08000 Screw; door flame mtg.
3
AA
7-19
XCPSD40P08000 Screw; door sashlright),
7 AA
thermal protection platecright),
air guide(right) and damper ass'y mtg.
7-20
XCTSD40P08000 Screw; steam duct mtg,
3 AA
7-21 XBPSD30P08000 Screw; AH sensor ass'y mtg.
AA
7-22 XFPSD40P08KOO Screw;
oven lamp mounting angle,
: AA
high voltage rectifier ass'y,
power supply cord grounding and
thermistor harness grounding mtg.
7-23 XFPSD40P08000 Screw;
turntable motor and magnetron mtg.
6
AA
7-24 XFPSDGOP14JSO Screw; power transformer mtg.
2
AA
7-25
XNESD40-32000 Nut;
cooling fan motor and
4
AA
upper
& lower latch heads mtg.
7-26 XNEUW40-32000 Nut;
convection fan mtg.
1
AA
7-27 XOTSC40P12000 Screw;
outer case cabinet mtg.
8
AA
7-28 XOTSD40P12RVO Screw; base plate, T/C panel and
11 AA
chassis support mtg.
7-29
XOTSD40P12000 Screw; rear cabinet, wire ho&der,
7
AA
cord holder and chassis support mtg.
7-30
XWSUW40-10000 Washer; convection fan mtg.
1 AA
7-31
XWWSD60-08000 Washer; power transformer mtg.
1
AA
7-32
XFPSD30PlOOOO Screw; fuse holder mtg.
1
AA
HOW TO ORDER REPLACEMENT PARTS
To have your order filled promptly and correctly, please furnish the following information.
1. MODEL NUMBER
2. REF. NO.
3. PART NO.
4. DESCRIPTION
(RDP1303U)
44
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