Sharp R-4H55, R-4X55, R-4X55B Service Manual

Page 1
WH5.5 R-4X55 ls4x55a
SHARP SERVICE MANUAL
S9312R4X55PJZ
MICROWAVE OVEN
R-4H55
MODELS Rm4H55
In interests of user-safety the oven should be restored to its original condi-
tion and only parts identical to those specified should be used.
TABLE OF CONTENTS
GENERAL IMPORTANT INFORMATION
we
......................................................................................................
WARNING
......................................................................................................................................................
.
RODUCT SPECIFICATIONS
.........................................................................................................................
2
APPEARANCE VIEW
....................................................................................................................................
3
OPERATING SEQUENCE
.............................................................................................................................
FUNCTION OF
IMPORTANT COMPONENTS’
............................................................................................
.;
TRABLESHOOTING CHART ......................................................................................................................... 7
TEST PROCEDURE ....................................................................................................................................
10
TOUCH CONTROL PANEL
........................................................................................................................
.20
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
.......................................................
.27
MICROWAVE MEASUREMENT
.................................................................................................................
.30
WIRING DIAGRAM
......................................................................................................................................
34
PICTORIAL DIAGRAM
...............................................................................................................................
.36
CONTROL PANEL CIRCUIT
......................................................................................................................
.38
PRINTED WIRING BOAD
............................................................................................................................
40
PARTS LIST ............
. ...................................................................................................................................
41
SHARP CORPORATION
Page 2
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R-4X55B
R-4X55
Page 3
SERVICE MANUAL
SHARP
MICROWAVE OVEN
R-4H55 /R-4X55/ Fb4X55B
GENERAL IMPORTANT INFORMATION
This Manual has been prepared to provide Sharp Corp. Service engineers with Operation and Service Information.
It is recommended that service engineers carefully study the en­tire text of this manual, so that they will be qualified to render sat­isfactory customer service.
CAUTION
MICROWAVE RADIATION
Service engineers should not be exposed to the microwave en­ergy which may radiate from the magnetron or other microwave generating devices if it is improperly used or connected. All in­put and output microwave connections, waveguides, flanges andgaskets must be secured. Never operate the device without a microwave energy absorbing load attached. Never look into an open waveguide.
WARNING
Never operate the oven until the following points are ensured.
(A) The door is tightly closed. (B) The door brackets and hinges are not defective. (C) The door packing is not damaged. (D) The door is not deformed or warped. (E) There is not any other visible damage with the oven.
Servicing and repair work must be carried out only by trained service engineers.
All the parts marked “*”
on parts list are used at voltages more
than 250V.
Removal of the outer wrap gives access to potentials above 250V.
SHARP CORPORATlON
OSAKA, JAPAN
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PARTS LIST
Page 4
._ .
R-4X55 A-4X55B
PRODUCT SPECIFICATIONS
ITEM
Power Requirements
Power Consumption Power Output
Case Dimensions
Cooking Cavity Dimensions
Turntable diameter Control Complement
Set Weight
DESCRIPTION
240 Volts (Australia) / 230 - 240 Volts (New Zealand) 50 Hertz Single phase, 3 wire earthed
1.4 kW 750 watts nominal of RF microwave energy (AS 2895 1986) 850 watts nominal of RF microwave energy (IEC-705-1988 ) Operating frequency of 2450MHz Width 550mm
Height 312mm Depth 420mm
Width 381 mm
Height 21 Omm Depth 411 mm 360mm Touch Control System Clock ( 1:OO - 12:59) Timer (0 - 99 minutes 99 secinds) Microwave Power for Variable Cooking
Repetition Rate;
HIGH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Full power throughout the cooking time
MEDIUM HIGH
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . approx. 70% of Full Power
MEDIUM
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . approx. 50% of Full Power
MEDIUM LOW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . approx. 30% of Full Power
LOW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . approx. 10% of Full Power
DEFROST SENSOR (R-4X55/4X55B) WEIGHT ADJUST (R-4X55/4X55B) EASY DEFROST (R-4H55) SENSOR INSTANT ACTION SENSOR COOK, REHEAT SENSOR NUMBER pads POWER LEVEL pad, MORE, LESS pads STOP/CLEAR pad
AUTO START/CLOCK pad
INSTANT COOK/START pad
Approx. 17 kg
GENERAL INFORMATlOil
WARNING
THIS APPLIANCE 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
2
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R-4H55
R-4X55 WX55B
APPEARANCE VIEW
1.
!1
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Ventilation openings Oven lamp
Door hinges
Safety door latches
See through door
Coupling
Door open button Touch control panel Digital readout Wave guide cover Access cover for oven
I
lamp replacement
12. Power supply cord
13.Menu Label for Sensor Cook
14. Rating label
15. Defrost rack(R-4X55/B)
TOUCH CONTROL PANEL
I
m SMART
I & EASY
R-4H55
a. SENSOR COOK PAD
Press to select several popular menus.
b. REHEAT SENSOR PAD
Press to select 3 popular Reheat menus.
c. WEIGHT ADJUST PAD (R-4X55, R-4X55B)
Press to zero the weight of your own dishes before defrosting on DEFROST SENSOR.
d. DEFROST SENSOR PAD (R-4X55, R-4X55B)
Press to defrost meat or seafood automatically.
e. SENSOR INSTANT ACTION PADS
Press to once to cook 1 of 6 popular menus.
f. NUMBER PAD
Press to enter cooking times, clock time or to select
the Sensor Cook menus.
g. POWER LEVEL PAD
Press to select microwave power setting
If not pressed, HIGH is automatically selected.
5
2 3 4 5
\
0 r
L-6 7 8 9 0
gc{jgqig
s
h. EASY DEFROST PAD (R-4H55)
Press to defrost meat by entering weight.
i.
MORE( A ), LESS( v ) PADS
Press to increase/decrease the time in one minute increments during cooking or to alter the doneness for the Sensor Instant Action, Reheat Sensor, Sensor Cook, Easy Defrost(R-4H55) or Defrost Sensor (R­4X55/4X558) modes.
j. STOP/CLEAR PAD
Press to clear during programming. Press once to stop operation of oven during cooking: press twice to cancel cooking programme.
k. AUTO START/CLOCK PAD
Press to set clock or Auto Start time.
I. INSTANT COOK/START PAD
Press once to cook for 1 minute at HIGH or increase by 1 minute mul­tiples each time this pad is pressed during cooking. Press to start oven after setting programmes.
3
Page 6
R-IX55 R-4X558
OPERATION SEQUENCE
OFF CONDITION
Closing the door activates all door interlock switches (Upper latch switch, Lower latch switch and Stop switch)
IMPORTANT
When the oven door is closed, the monitor switch contacts
(COM-NC) must be open. When the microwave oven is plugged in a wall outlet, rated voltage is supplied to the point (A3+A5) in the control unit.
Figure O-1 on page 34 or 35
1. The display flashes “88:88”.
2. To set any programmes or set the clock, you must first touch the STOP/CLEAR pad.
3. .I’ :
” appears in the display and the time counts up
every minute.
NOTE:When the oven door is opened, the oven lamp
comes on at this time.
MICROWAVE COOKING CONDITION HIGH COOKING
Enter a desired cooking time with the touching Number pads and start the oven with touching START pad.
Function sequence
Figure O-2 on page 34 or 35
CONNECTED COMPONENTS
RELAY
Oven lamp, Fan motor, Turntable motor
RYl
Power transformer
RY2
1.
2.
3.
4.
5.
Rated voltage. is supplied to the primary winding of the
power transformer. The voltage is converted to about
3.3 volts A.C. output on the filament winding and high voltage of approximately 2000 volts A.C. on the secon­dary winding. The filament winding voltage (3.3 volts) heats the mag­netron filament and the high voltage (2000 volts) is sent to the voltage doubling circuit, where it is doubled to negative voltage of approximately 4000 volts D.C.. The 2450 MHz microwave energy produced in the magnetron generates a wave length of 12.24 cm. This energy is channeled through the waveguide (transport channel) into the oven cavity, where the food is placed to be cooked. When the cooking time is up, a signal tone is heard and the relays (RYi+RY2) go back to their home position. The circuits to the oven lamp, power transformer, fan motor and turntable motor are cut off. When the door is opened during a cook cycle, the switches come to the following condition
CONDITION
SWITCH
DURING
DOOR OPEN
CONTACT
COOKING (NO COOKING)
Upper latch switch
COM-NO
Closed Open
Lower latch switch
COM-NO
Closed Open
Monitor switch
COM-NC
Open Closed
Stop switch
COM-NO
Closed
open
The circuits to the power transformer, fan motor and turntable motor are cut off when the upper latch switch, lower latch switch and stop switch are made open. The oven lamp remains on even if the oven door is opened after the cooking cycle has been interrupted, because the relay (RYl) stays closed. Shown in the display is the remaining time.
6. MONITOR SWITCH CIRCUIT The monitor switch is mechanically controlled by oven
door, and monitors the operation of the upper and lower latch switches.
6-l
6-2.
6-3.
When the oven door is opened during or after the cycle of a cooking program, the upper latch switch, lower latch switch and stop switch must open their contacts first. After that the contacts (COM-NC) of the monitor switch can be closed. When the oven door is closed, the contacts (COM-
NC) of the monitor switch must be opened. After that
the contacts of the upper latch switch, lower latch
switch and stop switch are closed. When the oven door is opened and the contacts of theupper latch switch, lower latch switch remain
closed. The fuse M8A will blow, because the monitor
switch is closed and a short circuit is caused.
VARIABLE COOKING
When the microwave oven is preset for variable cooking power. Rated voltage is supplied to the power transformer intermittently within a 32-second time base through the relay contact which is coupled with the relay(RY2). The fol­lowing levels of microwave power are given.
SETTING;
HIGH
32 sec. ON
MEDIUM HIGH 24 sec. ON
8 sec. OFF
Approx. 70%
MEDIUM
MEDIUM LOW
LOW
I
18 sec. ON 14 sec. OFF
Approx. 50%
12 sec. ON
20 sec. OFF
Approx. 30%
6 sec. ON 26 sec. OFF
Approx. 10%
1
NOTE:The ON/OFF time ratio does not exactly corre-
spond to the percentage of microwave power, be­cause approx. 2 seconds are needed for heating up the magnetron filament.
4
Page 7
SENSOR COOKING CONDITION
Using the SENSOR COOK, REHEAT SENSOR or SEN­SOR INSTANT ACTION function, the foods are cooked or defrosted without figuring time, power level or quantity. When the oven senses enough steam from the food, it re-
lays the information to its microprocessor which will calcu-
late 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. Potatoes at room temperature. Vapor is emitted very slowly.
2. Heat potatoes. Moisture and humidity is emitted rap­idly. You can smell the aroma as it cooks.
Cooking Sequence.
1. Touch each SENSOR COOK function pad to operating the sensor cooking.
NOTE:The oven should not be onerated on SENSOR
COOK, REHEAT SENSOR or SENSOR INSTANT ACTION immediately after plugging in the unit. Wait five minutes before cooking on SENSOR COOK, REHEAT SENSOR or SENSOR INSTANT
ACTION.
2.
3.
4.
Select desired Sensor setting. Touch START pad (REHEAT SENSOR and SENSOR
INSTANT ACTION fuction are not neccessary to touch START pad.) The coil of shut-off relay (RY-1) is ener­gized, the turntable motor, oven lamp and cooling fan motor are turned on, but the power transformer is not turned on. After about 16 seconds, the cook relay (RY-2) is ener­gized. The power transformer is turned on, microwave energy is produced and first stage is started. The 16 seconds is the cooling time required to remove any vapor from the oven cavity and sensor.
NOTE:During this first stage, do not open the door or touch
5.
6.
7.
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.
3. Sensor detects moisture and humidity and calculates cooking time and variable power.
5
Page 8
R4H55 R-4X55 R-4X55B
FUNCTION OF IMPORTANT COMPONENTS
DOOR OPEN MECHANISM
The door can be opened by pushing the door open button an the control panel. When the door open button is pushed, the latch lever is moved upward, operating the
latch head. The latch head is moved upward, and released
from the latch hook. Now, the door can be opened.
LATCH
MONITOR
HOOK \
, SWITCH
UPPER LATCH SWITCH
LATCH HEAD
DOOR OPEN ’ BUTTON
Figure D-l. Door Open Mechanism
UPPER LATCH SWITCH, LOWER LATCH SWITCH AND STOP SWITCH
1. When the oven door is closed, the contacts (COM - NO) must be closed.
2. When the oven door is opened, the contacts (COM ­NO) must be opened.
MONITOR SWITCH
1. When the oven door is closed, the contacts (COM- NC) must be opened.
2. When the oven door is opened, the contacts (COM­NC) must be closed.
3. If the oven door is opened and the contacts (COM- NO)
of the upper and lower latch switches fail to open, the fuse (M8A) blows simultaneously with closing the con­tacts (COM-NC) of the monitor switch.
CAUTION: BEFORE REPLACING A BLOWN FUSE
(M8A) TEST THE UPPER AND LOWER
LATCH SWITCHES, MONITOR SWITCH AND MONITOR RESISTOR FOR PROPER OPERATION. (REFER TO CHAPTER “TEST PROCEDURE”.)
MONITOR RESISTOR (0.8$2 20W)
The monitor resistor prevents the fuse (M8A) bursting when the fuse blows due to the operation of the monitor switch.
ASYMMETRIC RECTIFIER
The asymmetric rectifier is a solid state device that pre­vents current flow in both directions. And it prevents the temperature rise of the power transformer by blowing the
fuse (M8A) when the high voltage rectifier is shorted.
/
H;;jH VOLTAGE RECTIFIER
The rated peak reverse voltage of Di of the asymmetric
rectifier is 6 KV The rated peak reverse voltage of D2 of the
asymmetric rectifier is 1.7 KV. Dl and D2 of the asymmet-
ric rectifier or high voltage rectifier are shorted when the
each peak reverse voltage goes beyond the each rated
peak reverse voltage. (The process of blowing the fuse M8A.)
1. The high voltage rectifier is shorted by any causes when microwave cooking.
2. The peak reverse voltage of D2 of the rectifier goes beyond the rated peak reverse voltage 1.7 KV in the voltage doubler circuit.
3. D2 of the rectifier is shorted.
4. The large electric currents flow through the high voltage winding of the power transformer.
5. The large electric currents beyond 8A flow through the primary winding of the power transformer.
6. The fuse (M8A) blows by the large electric currents.
7. The power supply to the power transformer is cut off.
THERMAL CUT-OUT 145°C (OVEN)
The thermal cut-out located on the top of the oven cavity is designed to prevent damage to the oven if the foods in the oven catch fire due to over heating produced by unproper setting of cook time or failure of control unit. Under normal operation, the oven thermal cut-out remains closed. How­ever, when abnormally high temperatures are reached
within the oven cavity, the oven thermal cut-out will open at
145”C, causing the oven to shut down. The thermal cut-out will be close its contacts again when its temperature goes down lower than -20°C.
FUSE (M8A)
1. If the wire harness or electrical components are short­circuited, this fuse blows to prevent an electric shock or
fire hazard;’
2. The fuse blows when the asymmetric rectifier, H.V. rectifier, H.V. wire harness, H.V. capacitor, magnetron
or secondary winding of power transformer is shorted.
3. The fuse also blows when upper and lower latch
switches remains closed with the oven door open and when the monitor switch closes.
TEMPERATURE FUSE 15O’C (MG)
This fuse protects the magnetron against overheating. If the temperature goes up higher than 150°C because the fan motor is interrupted, the air inlet duct is blocked or the ventilation openings are obstructed, the fuse blows and puts the oven out of operation. The defective fuse must be replaced with new rated one.
6
Page 9
RdX55 RdX55B
TURNTABLE MOTOR
The turntable motor drives the turntable roller assembly to
neled through the oven cavity to remove steam and vapors
given off from the heating foods. It is then exhausted
rotate the turntable.
through the exhausting air vents at the oven cavity.
FAN MOTOR
The fan motor drives a blade which draws external cool air.
NOISE FILTER (For New Zealand Model R-4X55)
The noise filter prevents the radio frequency interference
This cool air is directed through the air vanes surrounding
that might flow back in the power circuit.
the magnetron and cools the magnetron. This air is chan-
servicing
WARNING TO SERVICE PERSONNEL
Microwave ovens contain circuitry capable of producing very high voltage and current, contact with any part of the high voltage circuit will result in electrocution.
REMEMBER TO CHECK 3D
REMEMBER TO CHECK*
1) Disconnect the supply.
2) Door opened, and wedged open.
3) Discharge high voltage capacitor.
1) Reconnect all leads removed from components dur­ing testing.
2) Replace the outer case (cabinet).
3) Reconnect the supply.
WARNING AGAINST THE CHARGE OF THE 4) Run the oven. Check all functions.
HIGH-VOLTAGE CAPACITOR
The high-voltage capacitor remains charged about
Microwave ovens should not be run empty. To test for
60 seconds after the oven has been switched off.
the presence of microwave energy within a cavity,
Wait for 60 seconds and then short-circuit the con-
place a cup of cold water on the oven turntable, close
nection of the high-voltage capacitor (that is, of the
the door and set the microwave timer for two (2) min-
connecting lead of the high-voltage rectifier) against
utes. Set the power level to HIGH and push the START
the chassis with the use of an insulated screwdriver.
button. When the two minutes has elapsed (timer at zero) carefully check that the water is now hot. If the
Sharp recommend that wherever possible fault-finding
water remains cold carry out 3D checks and re-exam-
is carried out with the supply disconnected. It may in,
ine the connections to the component being tested.
some cases, be necessary to connect the supply after the outer case has been removed, in this event carry out 3D checks and then disconnect the leads to the pri-
mary of the power transformer. Ensure that these leads
remain isolated from other components and the oven chassis. (Use insulation tape if necessary.) When the testing is completed carry out 3D checks and reconnect the leads to the primary of the power transformer.
When all service work is completed, and the oven is fully assembled, the microwave power output should be
checked and microwave reakage test carried out
TROUBLESHOOTING GUIDE
When troubleshooting the microwave oven, it is helpful
IMPORTANT: If the oven becomes inoperative because of a
to follow the Sequence of Operation in performing the
blown fuse M8A in the upper latch switch -
checks. Many of the possible causes of trouble will re-
lower latch switch - monitor switch - monitor
quire that a specific test be per-formed. These tests are
resistor circuit, check the upper latch switch,
given a procedure letter which will be found in the “Test
lower latch switch, monitor switch and moni-
Proceduresection.
tor resistor before replacing the fuse M8A.
7
Page 10
TEST PROCEDURE
ABCDEEEEFGHHII
J K L t 0
Ii
POSSIBLE CASE
:
AND DEFECTIVE
L2
:ONDITION
PROBLEM
Home fuse blows when power supply
cord is plugged into wall outlet.
FUSE M8A blows when power supply .cord is plugged into wall outlet.
“88:88” does not appear in display but power supply cord is plugged into wall outlet.
0
00
00
0 00 00 0
Display does not operate properly
&orrro~ when STOP/CLEAR pad is touched.
Oven lamp does not light at door opened. (Display appears.)
Oven does not start when the START pad is touched. (Display appears)
Oven lamp does not light (Display ap­pears.)
Fan motor does not operate. (Display appears.)
Turntable motor assembly does not operate. (Display appears.)
Oven or any electrical parts does not stop when cooking time is 0 or STOP/ CLEAR pad is touched.
Oven seems to be operating but little
0
0
0
00
00
00
0
0
0
0
00
or no heat is produced in oven load. 0 0 0 0 Ly:;rwave power level is set at
0
00
OOKMG Oven does not seems to be operating
roperly when MEDIUM HIGH ME-
oNDrTtoN EIUM, MEDIUM LOW or LOW i’s set.
(Oven operates roper1 at HIGH and then the ST 8 I! P/CL AR
touched the oven stops.)
pad is
00
Oven goes into cook cycle but shuts
down before end of cooking cycle.
000
0
Oven stops as soon as when the 0 0 0 0 START pad is touched.
0
in
#ENSOR
AH sensor does not end 1st stage or
iEiyr&
cooking during Sensor Cooking con­dition (Oven does not shut off when a
cup of water is boiling by Sensor
0
0
Cooking.) or oven stops soon.
‘EIGHT ENSOR
The display shows “ERROR” and
oND,T,ON oven stops during Defrost Sensor
Cooking condition
8
Page 11
. .--
R-4X55 R-4X55B
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I
Page 12
RdH55
RdX55 RdX55B
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
A
MAGNETRON TEST
NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPERATION.
CARRY OUT 3D CHECKS
Isolate the magnetron from the high voltage circuit by removing all leads connected to the filament
terminal. To test for an open circuit filament use an ohmmeter to make a continuity test between the magnetron
filament terminals, the meter should show a reading of less than 1 ohm. To test for a short circuit filament to anode condition, connect ohmmeter between one of the filament
terminals and the case of the magnetron (ground). This test should be indicated an infinite resistance.
If a low or zero resistance reading is obtained then the magnetron should be replaced.
MICROWAVE OUTPUT POWER (1 Litre water load)
The following test procedure should be carried out with the microwaveoven in a fully assembled condi­tion (outer case fitted).Microwave output power from the magnetron can be measured by way of IEC 705, 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/4.1 87calorie 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 thewater is V x AT
The formula is as follows; Pxtl4.187=VxAT P(W)=4.187xVxAT/t Our condition for the water load is as follows: Room temperature
. . . . . . . . . . . . . . . . . . . . . . . . . . around
20°C
Power supply Voltage . . . . . . . . . . . . . . . Rated voltage
Water load . . . . . 1000 g
Initial temperature
. . . . . . . . . . . 10+2”C Heating time . . . . . . . . . . . . . . . . . . . . . 47
sec.
P=90xAT
Measuring condition:
1. Container The water container must be a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190 mm.
2. Temperature of the oven and vessel The oven and the empty vessel are at ambient temperature prior to the start of the test.
3. Temperature of the water
The initial temperature of the water is (10 f. 2)X.
4. Select the initial and final water temperature so that the maximum difference between the final
water temperature and the ambient temperature is 5°C.
5.
Select stirring devices and measuring instruments in order to minimize addition or removal of heat.
6. The graduation of the thermometer must be scaled by 0.1 “C at minimum and an accurate ther­mometer.
7. The water load must be (1000 + 5) g.
8.
“t” is measured while the microwave generator is operating at full power. Magnetron filament heat­up time is not included.
NOTE: The operation time of the microwave oven is “t + 2" sec. 2 sec. is magnetron filament heat-up
time.
Measuring method:
1. Measure the initial temperature of the water before the water is added to the vessel.
(Example: The initial temperature Tl = 11 “C)
2. Add the 1 litre water to the vessel.
3
Place the load on the centre of the shelf.
10
Page 13
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
4. Operate the microwave oven at HIGH for the temperature of the water rises by a value A T of (10 -t 2)“C.
5. Stir the water to equalize temperature throughout the vessel.
6. Measure the final water temperature. (Example: The final temperature T2 = 21 “C)
7. Calculate the microwave power output P in watts from above formula.
Initial temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tl
= 11 ‘C
Temperature after
(47+2)= 49
sec. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . T2
= 21 “C
Temperature difference
Cold-Warm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AT1 = 10°C
Measured output power The equation
is ‘!P= 90 x AT"
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P= 90 x 10°C = 900 Watts
JUDGMENT: The measured output power should be at least + 15 % of the rated output
power.
CAUTION: 1 C CORRESPONDS TO 90 WATTS. REPEAT MEASUREMENT IF THE POWER IS
INSUFFICIENT.
l5d
Heat up for 49 sec.
MICROWAVE OUTPUT POWER (2 Litre water load)
The following test procedure should be carried out with the microwave oven in a fully assembled condition (with outer case fitted). Microwave output power from the magnetron can be measured by way of substitution, i.e. it can be measured by using a 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. 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 formulae is as follows;
P =8330xAT/t
Our condition for the water load is as follows:
Room temperature . . . . . . . . . . . . . . ...23+ 2°C
Power supply Voltage
. . . . . . . . . . . . . . . . . . Rated
voltage.
Water load . . . . ...2000 ml
Initial temperature
. . . . . . . 23 & 1 “C
Heating time .,.. 1 min. 51 sec.
P=75xAT
Measuring method:
A) The two water containers must be prepared.
The water container must be one (1) litre beaker made of Pyrex glass and its diameter approxi­mately 12cm.
B) Put the one (1) litre water into each beaker (Each beaker has one litre water). The initial tempera-
ture of the water should be 23-C.
C) Mark Tl on the one beaker and mark T2 on the other one. And stir the water and measure the
temperature of water the thermometer and note them. The graduation of the thermometer must be
scaled by 0.1 “C at minimum and an accurate mercury thermometer is recommended. D) Place the two (2) beakers as touching each other in the centre of the oven cavity. E) Set the timer to 1 minute and 51 seconds and then start the oven at HIGH.
11
Page 14
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
F) The time must be measured with stopwatch or wristwatch. G) After 1 minute and 51 seconds, stop the oven by opening the door. H) Put the two (2) beakers out of the oven cavity and measure the temperature of the water by stirring
the water with thermometer and note them.
Example
Initial temperature . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tl = 23°C T2 = 24°C
Temperature after 1 min. 51 sec.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tl = 33°C T2 = 34°C
Temperature difference Cold-Warm
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AT1 = 10°C AT2 = 10°C
Mean temperature
rise AT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AT = (AT1 rt AT2) / 2 = (1 O”C+lO”C) / 2 = 10°C
Measured output power
The equation is P= 75 x AT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P= 75 x
10°C = 750 Watts
NOTE: The measured output power should be at least f 15 % of the rated output power.
CAUTION: 1°C CORRESPONDS TO 75 WATTS.
REPEAT MEASUREMENT IF THE POWER IS INSUFFICIENT.
(Tl ‘C)
(T2’C) (Tl ‘C)
Heat up for 1 min. 51 set
II
Pii
2 -
- -
- -
- -
(T2’C)
B
POWER TRANSFORMER TEST
WARNING:
High voltages and large currents are present at the secondary winding and fila­ment winding of the power transformer. It is very dangerous to work near this part when the oven is on. NEVER make any voltage measurements at the high­voltage circuits, including the magnetron filament.
CARRY OUT 3D CHECKS.
Disconnect the leads to the primary winding of the power transformer. Disconnect the filament and secondary winding connections from the rest of the HV circuitry. Using an ohmmeter, set on a low range, it is possible to check the continuity of all three windings. The following readings should be obtained :
-_
a. Primary winding
. . . . . . . . . . . . . . . . . . . . . . . . . approximately
1 .42 ohms.
b. Secondary winding
. . . . . . . . . . . . . . . . . . . . . approximately
78.9ohms.
c. Filament winding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
less than 1 ohm.
lf the reading obtained are not as stated above, then the power transformer is probably faulty and
should be replaced.
CARRY OUT $FJ CHECKS
C
HIGH VOLTAGE RECTIFIER ASSEMBLY TEST
HIGH VOLTAGE RECTIFIER TEST
CARRY OUT 3D CHECKS. Isolate the high voltage rectifier assembly from the HV circuit. The high voltage rectifier can be tested
using an ohmmeter set to its highest range.
12
Page 15
R-4H55 R-4X55 R-4X55B
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
Connect the ohmmeter across the terminal B+C of the high voltage rectifier and note the reading obtained. Reverse the meter leads and note this second reading. The normal resistance is infinite in one direction and mor than 100 kR in the other direction.
CARRY OUT* CHECKS
ASYMMETRIC RECTIFIER TEST
ASYMMETRIC
CARRY OUT 3D CHECKS.
RECTIFIER
Isolate the high voltage rectifier assembly from the HV circuit. The asymmetric rectifier can be tested using an ohmmeter se? to its highest range. Connect the ohmmeter across the terminals A+B of the asymmetric rectifier and note the reading obtained. Reverse the meter leads and note this second reading. If an open circuit is indicated in both directions then the asymmetric rectifier is good. If an asymmetric rectifier is shorted in either direction, then the the asymmetric rectifier is probably faultly and must be replaced with the high voltage rectifier. When the asymmetric rectifier is defective, check whether magnetron, high voltage rectifier, high voltage wire or filament winding of the power trans-
former is shorted.
CARRY OUT 4R CHECKS
NOTE: For measurement of the resistance of the rectifier, the batteries of the measuring instrument
must have a voltage at least 6 volts, because otherwise an infinite resistance might be shown in both directions.
D
HIGH VOLTAGE CAPACITOR TEST
CARRY OUT 3D CHECKS.
A. Isolate the high voltage capacitor from the circuit. B. Continuity check must be carried out with measuring instrument which is set to the highest resis-
tance range.
C. A normal capacitor shows continuity for a short time (kick) and then a resistance of about 10 MR
after it has been charged. D. A short-circuited capacitor shows continuity all the time. E. An open capacitor constantly shows a resistance of about 10 MR because of its internal 10 MQ
resistance. F. When the internal wire is opened in the high voltage capacitor, the capacitor shows an infinite
resistance.
G. The resistance across all the terminals and the chassis must be inifinte when the capacitor is nor-
mal.
If incorrect readings are obtained, the high voltage capacitor must be replaced.
CARRY OUT $FJ CHECKS
E
SWITCH TEST
CARRY OUT 3D CHECKS.
Isolate the switch to be tested and using an ohmmeter check between the terminals as described in the
following table.
Table: Terminal Connection of Switch
Plunger Operation
COM to NO COM to NC
Released
O.C. S.C.
Depressed
S.C.
O.C.
COM; Common terminal NO; Normally open terminal
NC; Normally closed terminal S.C.; Short circuit O.C.; Open circuit
I
If incorrect readings are obtained, make the necessary switch adjustment or replace the switch.
CARRY OUT 4R CHECKS.
13
Page 16
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
NOISE FILTER TEST (New Zealand Model)
CARRY OUT 3D CHECKS. Disconnect the leads from the terminals of the noise filter. Using an ohmmeter, Check between the terminals as de­scribed in the following table.
L (min) 1 CxtiO% 1 CyX?O% l.OmH 1 O.lpF 1 22OOpF
MESURING POINT
INDICATION OF OHMMETER
Between N and L
Open circuit
Between terminal N and WHITE
Short circuit
Between terminal Land RED
Short circuit
If incorrect readings are obtained, replace the noise filter unit.
CARRY OUT 4R CHECKS.
G MONITOR RESISTOR TEST
CARRY OUT =CHECKS. Disconnect the leads from the monitor resist. Using an ohmmeter and set on a low range. Check
between the terminals of the monitor resistor.
The resistance of monitor resistor is aoorox. 0.8 ohms.
If incorrect readings are obtained, replace the monitor resistor.
CARRY OUT 4R CHECKS.
H TEMPERATURE FUSE OR THERMAL CUT-OUT TEST
CARRY OUT 3D CHECKS
Disconnect the leads from the terminals of the temperature fuse or thermal cut-out. Then using an
ohmmeter, make a continuity test across the two terminals as described in the table below.
CARRY OUTa CHECKS
Table: Thermal cut-out Test
Parts Name
Thermal cut-out 145’C Temperature fuse 15o’C
Temperature of “ON” condition
Temperature of “OFF” condition
Indication of ohmmeter
(closed circuit)
(open circuit)
(When room temperature
is approx. 20-C)
-20-c
Above 145-C
Closed circuit.
This is not resetable type
Above 150X
Closed circuit.
If incorrect readings are obtained, replace the temperature fuse or thermal cut-out.
An open circuit temperature fuse 150% (MG) indicates that the magnetron has overheated, this may be due to resistricted ventilation, cooling fan failure or a fault condition within the magnetron or HV circuit.
An open circuit thermal cut-out 145°C (OVEN) indicates that the foods in the oven may catch fire, this may be due to over heating produced by improper setting of the cooking time or failure of the control panel.
14
Page 17
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
I
MOTOR WINDING TEST
CARRY OUT aCHECKS
Disconnect the leads from the motor. Using an ohmmeter, check the resistance between the two terminals as described in the table below.
Table: Resistance of Motor
Motors Resistance Fan motor Approximately 246 R Turntable motor Approximately 12.5 kR
If incorrect readings are obtained, replace the motor.
CARRY OUT $FJ CHECKS
LIVE TEST FOR MOTOR WINDINGS
CAUTION: THE FOLLOWING PROCEDURE REQUIRES THE OVEN TO BE CONNECTED TO THE
SUPPLY AND SHOULD ONLY BE USED IF THE RELEVANT “COLD” CHECKS FOR THE MOTOR UNDER TEST ARE INCONCLUSIVE.
1. CARRY OUT 3D CHECKS
2. Disconnect the leads from the primary of the power transformer. Make sure that the leads remain isolated from other oven components and chassis. (Use insulation tape if necessary.)
3. Connect a voltmeter, set to 25OV AC, across the motor terminals. (Refer to the relevant motor test procedure or pictorial diagram for the correct terminal numbers.)
4. Arrange the meter in a position where it can be read during the test. (Do not touch the meter, meter leads or oven circuitry while the oven is active.)
5. Close the oven door.
6. Set the power level to HIGH and set the relevant timer for about three (3) minutes.
7. Note the reading on the meter and carefully observe the motor under test to see if it is turning.
8. CARRY OUT 3D CHECKS
9. Remove test meter leads.
1 O.Reconnect the leads to the primary of the power transformer.
If a reading of the line voltage was obtained (step 7) but the motor was not turning then it is faulty and should be replaced. If the meter indicated that no supply was present then the wiring to the motor should be checked for continuity.
J
BLOWN FUSE M8A
CARRY OUT 3D CHECKS
1. If the fuse M8A is blown, there could be shorts or ground in electrical parts or wire harness. Check them and replace the defective parts or repair the wire harness.
2. If the fuse M8A is blown when the door is opened, check the 1st. latch switch, 2nd. latch switch, monitor switch.and monitor resistor.
If the fuse M8A is blown by incorrect door switching replace the defective switch(s) and the fuse M8A.
3.
If the fuse M8A is blown, there could be a short in the asymmetric rectifier or
there could be a ground in wire harness. A short in the asymmetric rectifier may have occured due to short or ground in H.V. rectifier, magnetron, power transformer or H.V. wire. Check them and re­place the defective parts or repair the wire harness.
CARRY OUT 4R CHECKS
CAUTION: Only replace fuse M8A with the correct value replacement
15
Page 18
i
R-4X55 R-4X55E
TEST PROCEDURES
PROCEDURE
LElTER
COMPONENT TEST
K 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 isdivided into troubleshoot­ing by unit replacement is described according to the symptoms indicated.
1. Key Unit.
Note : Check key unit ribbon connection before replacement. 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. Before replacing the control unit, perform the key unit test to determine if control units faulty. 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. d) The corresponding segments of all digits do not light up; or they continue to light up. e) Wrong figure appears. f) A certain group of indicators do not light up. g) The figure of all digits flicker. 2-3 Other possible troubles caused by defective 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.
L
KEY UNIT TEST
If the display fails to clear when the STOP/CLEAR pad is depressed. first verify the ribbon is making good contact, verify that the door sensing switch(stop switch) operates properly; that is the contacts are closed when the door is closed and open when the door is open. If the door sensing switch(stop switch) is good, disconnect the flat ribbon that connects the key unit to the control unit and make sure the door sensing switch is closed(either close the door or short the stop switch connecter). Use the key unit matrix indicated on the control panel schematic and place a jumper wire between the pins that correspond to the STOP/CLEAR pad making momentary contact. If the control unit responds by clearing with abeep, the key unit is faulty and must be replaced. If the control unit does not respond, it is faulty and must be replaced. If a specific pad does not respond, the above method may be used ( after clearing the control unit) to determine if the control unit or key pad is at fault.
(R-4X55. R4X558)
M
RELAY TEST
Remove the outer case and check voltage between Pin Nos. 3 and 5 of the S-pin connector (A) on the control unit with an A-C. voltmeter.; The meter should indicate 240 volts, if not check oven circuit.
RYl and RY2 Relay Test
These relays are operated by D.C. voltage.
16
Page 19
R-4H55 R-4X.55 R-4XS5B
TEST PROCEDURES
PROCEDURE
LElTER
COMPONENT TEST
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking.
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
VOLTAGE
CONNECTED COMPONENTS
RYl Approx. 25V.D.C.
Oven lamp/Turntable motor/Cooling fan motor
RY2
Approx. 24V.D.C.
Power transformer
N
PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD (PWB) IS OPEN.
To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary on the PWB, this foil pattern acts as a fuse. If the foil pattern is open, follow the troubleshooting guide given below for repair.
Problem: POWER ON, indicator does not light up.
STEPS OCCURANCE
CAUSE OR CORRECTION
1 The rated voltage is not applied to POWER
Check supply voltage and oven main unit.
terminal of CPU connector (CN-A)
2 The rated voltage is applied to primary side of
Power transformer or secondary circuit defective. Check
power transformer. and repair.
I
I
3
Only pattern at “a” is broken.
‘Insert jumper wire Jl and solder.
I
I
4
Pattern at “a” and “b” are broken.
‘Insert the coil RCILF2003YAZZ between “c” and ‘IS’.
NOTE: At the time of these repairs, make a visual
inspection of the varistor for burning dam­age and examine the transformer with tester presence of layer short-circuit
(check primary coil resistance). If any ab-
normal condition is detected, replace the
defective parts.
0
AH SENSOR TEST
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(35”C). (3) The unit should not be installed in any area where heat and steam are generated. The unit
should not be installed, for example, next to a conventional surface unit. Refer to the “INSTAL­LATION Instructions” .
17
Page 20
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
(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 about 41 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 opera-
tion. 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 pads 1 and 0. Now, the oven is in the sensor cooking
condition and SC-10 will appear in the display.
(5) Touch Start pad.The oven will operate for the first 16 seconds, without generating microwave
energy.
NOTE: ERROR will appear if the door is opend or STOP/CLEAR pad is touched during first stage
of sensor cooking.
(6) After approximately 16 seconds, microwave energy is produced, oven should turn off when
water is boiling (bubling).
If the oven does not turn off, replace the AH sensor or check the control unit, refer to explanation below:
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. (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 1 pad and 0 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). lf new sensor dose not operate properly, the problem is with the control unit.
CHECKING CONTROL UNIT
(1) Disconnect oven from power supply and remove outer case. (2) Discharge the high voltage capacitor. (3) Disconnect the wire leads from the cook relay. (4) Disconnect the sensor connector that is mounted to lower 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:
18
Page 21
R-4H5.5 R-4X55 R-4X.558
TEST PROCEDURES
PROCEDURE
LETTER COMPONENT TEST
6-l. Touch SENSOR COOK pad and number 1 pad and 0 pad. 6-2. The control panel is in the sensor cooking operation. 6-3. After approximately 20 seconds, push plunger of select switch.This condition is same as
ludgement 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.
Rl,R2:22ohm*1%1/2W
To connector(F) on Control Unit.
R3:1OkohmL5%1/4W
F-l -
R4: lMohmL5% l/4
F-2 ­F-3 -
CONNECTOR
r/ Plunger
18
NC
NO
FigureA. Sensor Dummy Resistor Circuit
P
WEIGHT SENSOR ASSEMBLY AND IC3lMEMORY) TEST.(R-4X!%,R-4X55B)
After replacing the weight sensor, turntable,control unit,turntable motor,or IC3, carry out the follow­ing procedure in order to calibrate the weight sensor. If the weight sensor is not recalibrate, the food may be over or under cooked.
The following procedure should be carried out with microwave oven in a fully assembled condition (with outer case fitted).
1. Test Method
1. Place the turntable on the roller stay correctly, and close the door.
2. Plug the oven into a power point. (“88:88” will appear on the display.)
3. Press the STOP/CLEAR pad. (Display shows ’ : ” with sound of buzzer.)
4. Press the AUTO START/CLOCK pad. (Display shows ’
5. Press the DEFROST SENSOR pad. (Display shows ”
0” with sound of buzzer.)
6. Press the POWER LEVEL pad. (Display shows ’
O”.)
O”.)
7. Press the INSTANT COOK/START pad. (Display shows ” TEST” with sound of buzzer.)
8. Press the “4” of number pads. (Display shows ” lamps come on.)
4” with sound of buzzer, and tuntable and oven
9. After 56 seconds, make sure that the display shows “00055 - 00250” with sound of buzzer.
If display shows less than 00055 or more than 00250, weight sensor is defect.
10. Place the weight 1.3 Kg+1 % (water load 1.3 Kg+1 %) on the turntable.
11. Press the “6” of number pads. (Display shows ” oven lamps come on.)
6” with sound of buzzer, and turntable and
12. After 56 seconds, make sure that the display shows “00030 - 00200” with sound of buzzer.
If display shows less than 00030 or more than 00200, weight sensor is defect.
13. Disconnect the oven from power supply, and repeat above procedure items 1 to 7
14. Press the “7” of number pads, and make sure that the display shows “00030 -00200”.
If display shows less than 00030 or more than 00200, IC3 is defect.
15. Press the STOP/CLEAR pad. (Display shows ” : ” with sound of buzzer.)
16. Impose 1.3 kg load on the defrosting rack and place it in the oven cavity. Touch the “DEFROST
SENSOR” pad. After approx. 56 seconds, time display appears.
2. Acceptance Standard.
1. Under 1.3 kg load : 32 min 22 sec. k 242 sec.
19
Page 22
%
iwH55 R-4X5.5 R-4X558
TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
The touch control section consists of the following units as shown in the touch control panel circuit.
3) Synchronizing Signal Circuit
(1) Key Unit (2) Control Unit
The principal functions of these units and the signals communicated among them are explained below.
Key Unit
The key unit is composed of a matrix, signals generated in the LSI are sent to the key unit through B2,B3,B5,
B6,B7,GO and Gl. When a key pad is touched, a signal
‘is completed through the key unit and passed back to the
LSI through HO - H3 to perform the function that was re-
quested.
Control U nit
Control; unit consists of LSI, power source circuit, syn-
chronizing signal circuit, ACL circuit, buzzer circuit, tem-
perature measurement circuit, reheat sensor circuit and indicator circuit.
1) LSI
This LSI controls the temperature measurement sig­nal, reheat sensor signal, key strobe signal, relay driv­ing signal for oven function and indicator signal.
2) Power Source Circuit
This circuit generates voltage necessary in the control unit.
Symbol Voltage Application VC
-5.2v
LSI(ICl), ACL circuit
VP
-25V Fluorescent display tube : Grid and anode voltage
VFl
3Vac
Filament of fluorescent display tube
VF2
(VFl to VF2 voltage)
4)
ACL Circuit
A circuit to generate a signal which resets the LSI to the initial state when power is supplied.
5)
Buzzer Circuit
The buzzer is responds to signals from the LSI to emit
noticing sounds (key touch sound and completion
sound).
6)
Reheat Sensor Circuit
This circuit detects moisture of a food which is cooking
to allowl its automatic cooking.
The power source synchronizing signal is available in order to compose a basic standard time in the clock circuit. It accompanies a very small error because it works on commercial frequency.
7) Stop Switch
A switch to “tell” the LSI if the door is open or closed.
8) Relay Circuit
To drive the magnetron, fan motor, turntable motor and light the oven lamp.
9) Indicator Circuit
Indicator element is a Fluorescent Display.
Basically, a Fluorescent Display is triode having a cathode, a grid and an anode. Usually, the cathode of a Fluorescent Display is directly heated and the
filament serves as cathode.
The Fluorescent Display has 6-digits, 13-segments
are used for displaying figures.
10) Weight Sensor Circuit
The circuit measures the weight of food by piezo-elec-
tric device.
20
Page 23
DESCRIPTION OF LSI
LSI(IZA506DR)
The I/O signals of the LSI(IZA506DR) are detailed in the following table.
Pin No.
Signal
110
Description
1
vss
IN
Power source voltaae: -5.2V
VC voltage of power source circuit input.
2
VASS IN
Reference voltaae inout terminal.
A reference voltage applied to the A/D converter in the LSI. The reference voltage is generally maintained at -5V.
3
VREF IN
Reference voltaae innut terminal.
A reference voltage appliedI the A/D converter in the LSI. Connected to GND.(OV)
4
A0
IN
Terminal to chanae functions accordina to the model.
Signal in accordance with the model in operation is applied to set up its function.
5-7
Al-A3 IN
Heatina constant comnensation terminal.
8
A4
IN
Innut sianal which communicates the door ooenklose information to LSI.
Door closed; “H” level signal( Door opened; “L” level signal(-5V).
9
A5
IN
WEIGHT sensor innut. (R-4X55.R-4X55Bl
This input is an analog input terminal from the WEIGHT sensor circuit, and con­nected to the A/D converter built into the LSI.
10
A6
IN AH sensor innut.
This input is an analog input terminal from the AH sensor circuit, and connected to the A/D convener built into the LSI.
11
12
13 14 15
A7
IN
Used for intial 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
coverter built into the LSI.
RESET IN
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied. Set to “L”
level the moment power is applied, at this time the LSI is reset. Thereafter set at “H” level.
EO
OUT Clock signal to IC-3 (R-4X55,R-4X55B) El IN/OUT Data signal output from IC-3 and input to IC-3 (R-4X%,R-4X55B) INTl IN Sianal to svnchronize LSI with commercial Dower source freaencv.
This is basic timing for all real time proc­essing of LSI
j--J& : 17
16 E3 OUT
Maanetron hiah-voltaae circuit drivina sianal.
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 (M.HIGH, MED,M.LOW,LOW) the signal turns to “H” level and “L” level in repetition according to the power level.
17-21 ~
co-c4 OUT Used for initial balancing of the bridge circuit (absolute humidity sensor)
21
Page 24
Pin No.
Signal
Description
Used for initial balancing of the bridge circuit (WEIGHT SENSOR).(R4X55,R4X556)
l/O
OUT
22-23
C5-C6
24
c7
OUT
Oven lame drivina sianal. (Sauare Waveform : 50Hz)
To turn on and off the shut-off relay(RY1).
zonlsec
The square waveform voltage is delivered
H
to the relay (RYl) driving circuit and relay
-ll-u-u-l -ll-uu-T
L
(RY2 ) control circuit.
O”“ng caC,ng
25
HO
IN Sianal comina from touch kev.
When any one of G-l 2 line keys on key matrix is touched, a corresponding signal from B2,83,85,86,87,GO and Gl will be input onto HO. When no key is touched, the signal is held at ‘I” level.
26
HI
IN Sianal similar to HO.
When any one of G-l 1 line keys on key matrix is touched, a corresponding signal will be input into Hl.
27
H2
IN
Sianal similar to HO.
When any one of G-l 0 line keys on key matrix is touched, a corresponding signal will be input into H2.
28 H3
IN Sianal similar to HO.
When any one of G-9 line keys on key matrix is touched, a corresponding signal will
be input into H3.
29 H4
H5-H7
VPP
OUT
OUT
IN
Diait selection sianal.
The relation between digit signal and digit are as follows; Digit signal
Digit
H
H4 ________________________________ 1 St.
S(so”Z)
I.
H5 ________________________________ 2nd.
____------_-____
GND
H6 ________________________________ 3rd.
vp
H7 ________________________________ 4th.
FO _____ ____________________________ 5th. BO,Bl ____________________________ 6th.
Normally, one pulse is output in every 6
period, and input to the grid of the Fluo-
rescent Display.
FO n 81,En
I----- GND
VP
30-32
Diait selection sianal.
Signal similar to H4.
33
34
Anode (Seament) of Fluorescent DisDlav liaht-uD voltaae: -25V
Vp voltage of power source circuit input.
FO
35-36
BO-Bl
OUT
OUT
OUT
c
Diait selection sianal.
Signal similar to H4.
Diait selection sianal.
Signal similar to H4.
Seament data sianals.
The relationship between signals and indicators are as follows: Signal
Segment Signal
Segment
62 _______________ LB
GO _______________ f
G6 _______________ UB
B7 _______________ e
G5 _-____-________ k
B(j _______________ d
W-W
G4 _______________ j
B5 _______________ c
G3 _______________ i
B4 _-_____________ b
G2 ______-________ h
‘rul’:: +
B3 _______________ a
Gl _______________ g
Kev strobe sianal.
Signal applied to touch-key section. A pulse signal is input to HO - H3 terminal while one of G-l line keys on kev matrix is touched.
22
37
B2
Page 25
Pin No.
38
Signal
I/O
B3
OUT
39
B4
OUT
40
B5
OUT
41 B6
OUT
42
87 OUT
43
GO OUT
44 Gl OUT
45-49 G2-G6 OUT
50 G7 OUT
51 52 53
vcc
IN
TEST 0 OUT
IN
-____ OUT
54
0 IN IN
Description
Seament data sianal.
Signal similar to 82.
Kev strobe sianal.
Signal applied to touch-key section. A pulse signal is input to HO - H3 terminal while
one of G-2 line keys on key matrix is touched.
Seament data sianal.
Signal similar to 82.
Seament data sianal.
Signal similar to B2.
Kev strobe sianal.
Signal applied to touch-key section. A pulse signal is input to HO - H3 terminal while
one of G-4 line keys on key matrix is tsuched.
Seam&t data sianal.
Signal similar to 82.
Kev strobe sianal.
Signal applied to touch-key section. A pulse signal is input to HO - H3 terminal while
one of G-5 line keys on key matrix is touched.
Seament data sianal.
Signal similar to B2.
Kev strobe sianal.
Signal applied to touch-key section. A pulse signal is input to HO - H3 terminal while one of G-6 line keys on key matrix is touched.
Seament data sianal.
Signal similar to 82.
Kev strobe sianal.
Signal applied to touch-key section. A pulse signal is input to HO - H3 terminal while one of G-7 line keys on key matrix is touched.
Seament data sianal.
Signal similar to 82.
Kev strobe sianal.
Signal applied to touch-key section. A pulse signal is input to HO - H3 terminal while one of G-8 line keys on key matrix is touched.
Seament data sianal.
Signal similar to B2.
Sianal to sound buzzer.
A . Key touch sound. B : Completion sound.
Connected to GND. Connected to VC (-5.2V).
-___
--
-.
lnternel clock OSCillatiOn freaUenCV Control OUtDut.
Output to control oscillation input of 0 IN.
Internal clock oscillation freauencv settina inout.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit
with respect to 0 OUT terminal..
23
Page 26
R4H5.5 R-4X5.5 R-4X5.W
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 the open vessel. Each sensor is provided with the protective cover made of metal mesh to be protected from the external airflow.
(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 (Rl and R2). The output of the bridge circuit is to be amplified by the operational amplifier. Each thermistor is supplied with a current to keep itself heated at about 150°C (302°F) and 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 inten-
sity of which is increased as the absolute humidity of the air increases. Since the output is very minute, it will be amplified by the operational amplifier.
~~~~~, l/q;
Absolute humidity (g/m 2)
(3)Detector Circuit of Absolute Humidity Sensor
This detector circuit is used to detect the output volt­age of the absolute humidity circuit to allow the LSI to control sensor cooking of the unit. When the unit is set in the sensor cooking mode, 16
seconds later the detector circuit starts to function and the LSI observes the initial voltage available at its IN1 terminal. With this voltage given, the switches SW1 to SW5 in the LSI are turned on in such a way as to change the resistance values in parallel with R-l. Changing the resistance values results in that there is the same potential at both 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 gets in the next necessary operation automatically. When the LSI starts to detect the initial voltage at IN1 terminal16 seconds after the unit has been put in the Sensor Cooking mode, if it is impossible to take a bal­ance of the bridge circuit due to disconnection of the absolute humidity sensor, ERROR will reappear on the display and the cooking is stopped.
Absolute humidity sensor circuit
!
rhermista tn “hcd “PCCd
I
C-
s&-z. iI ,~,AB
/ c~~~,~o 3
‘-a-J 1 -1 -1; 1
LSI
nt, “!
I
WV
24
Page 27
-!!!-
R-4X55 R-lX55B
WEIGHTSENSOR CIRCUIT (R-4X55, R-4XX55B)
Turntable
Turntable Motor
Section View of Turntable
Weight Sensor
support
Construction of W eight Sensor
Weight
6B”SW
Weight sensor circuit
This circuit works to weight the food by weight sensor during SENSOR DEFROST modes to set heating time. Piezo­electric device is used in theweight detector section. When the roller below the turntable presses the knob, through oven seal. the piezO-electric device generates the voltage according the load applied on the roller. Weight sensor and then sent to A/D conversion input pin A5 inside of LSI. The LSI converts the value into weight and calculates the heating time. Weight measurement is made by the three rollers passing on the knob, taking the average value of the voltage then produced. This initial balancing is set up about 50 seconds afterunit is put in the Weight sensor cooking mode.
25
Page 28
SERVICING
1 .Precautions for Handling Electronic Components
This unit uses CMOS LSI in the integral part of the circuits. When handling these parts, the following pre­cautions should be strictly followed. CMOS 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 CMOS LSI.
1) When storing and transporting, thoroughly wrap them in aluminum foil. Also wrap all PW boards con­taining them in aluminium foil.
2) When soldering, ground the technician as shown in the figure and use grounded soldering iron and work table.
2.Shapes of Electronic Components
@
Transistor
Transistor
DTAll4YS
2SB793
DTAI 43ES
CB
DTBl43ES DTDl43ES
E
2SA933S 2SC174OS
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 AND PRESENTS 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 must be insulated with an insulating tape. After servic­ing, be sure to replace the leads to their original loca-
tions. A.On some models, the power supply cord between
the touch control panel and the oven itself is so short
that the two can’t be separated. 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 between 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 door sensing 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 door sensing 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 sen-
sor-related controls of the touch control panel by using
the dummy resistor(s).
4Servicing Tools
Tools required to service the touch control panel assem-
bly.
1) Soldering iron: 30W (It is recommended to use a soldering iron with a grounding terminal.)
2) Oscilloscope: Single beam, frequency range: DC­1OMHz type or more advanced model.
3) Others: Hand tools
5.0ther Precautions
1) Before turning on the power source of the control unit, remove the aluminum foil applied for preventing static electricity.
2) Connect the connector of the key unit to the control unit being sure that the lead wires are not twisted,
3) After aluminum foil is removed, be careful that abnor­mal voltage due to static electricity etc. is not applied
to the input or output terminals.
4) Attach connectors, electrolytic capacitors, etc. to
PWB, making sure that all connections are tight.
5) Be sure to use specified components where high pre-
cision is required.
26
Page 29
R-4H55 R-4X55 R-4X55B
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
WARNING: AVOID POSSIBLE EXPOSURE TO MICROWAVE ENERGY. PLEASE FOLLOW THE INSTRUC-
TIONS BELOW .BRBEFORE OPERATING THE OVEN.
1
1. CARRY OUT 3D CHECKS.
2. Make sure that a definite “click” can be heard when the door is unlatched. (Hold the door in a closed position with one hand, then push the door open button with the other, this causes the latch heads to rise, it is then pos­sible to hear a “click” as the door switches operate.)
3. Visually check the door and cavity face plate for dam­age (dents, cracks, signs of arcing etc.).
2. Door hinge, support or latch hook is damaged.
3. The door gasket or seal is damaged.
4. The door is bent or warped.
5. There are defective parts in the door interlock system.
6. There are defective parts in the microwave generating and transmission assembly.
7. There is visible damage to the oven.
Do not operate the oven:
Carry out any remedial work that is necessary before oper-
1. Without the RF gasket (Magnetron).
ating the oven.
2. If the wave guide or oven cavity are not intact.
Do not operate the oven if any of the following conditions exist
3. If the door is not closed.
4. If the outer case (cabinet) is not fitted.
1. Door does not close firmly. Please refer to ‘OVEN PARTS, CABINET PARTS, DOOR PARTS’, when carrying out any of the following removal proce-
dures:
OUTER CASE REMOVAL
To remove the outer case, proceed as follows.
6. Discharge the H.V. capacitor before carring out any
1. Disconnect oven from power supply.
further work.
2. Open the oven door and wedge it open.
7. Do not operate the oven with the outer case removed.
3. Remove the screws from rear and along the side edge
N.B.; Step 1,2 and 6 from the basis of the 3D checks.
of case.
4. Slide the entire case back about 1 inch(3 cm) to free it
from retaining clips on the cavity face plate.
5. Lift the entire case from the oven.
CAUTION: DISC
11.--- I..-.. .,-.-1-- -.-.I.
TOH Ott-u COMPONEI
JHAHtit HltiH VULI Atit C;Al-‘AC;I­. ---A
IRE TOUCHING ANY OVEN ITS OR WIRING.
POWER TRANSFORMER REMOVAL
1. CARRY OUT 3D CHECKS
2. Remove the fan motor assembly from the oven refer-
ring to “FAN MOTOR ASSEMBLY”.
3. Disconnect the filament lead of the power transformer
from high voltage capacitor.
4. Disconnect the filament lead of the power transformer from the magnetron.
5. Disconnect the high voltage wire of H.V. rectifier as­sembly from the power transformer.
6. Remove the one (1) screw from under side and two (2) screws from upper side holding the transformer to bot­tom plate.
7. Remove the transformer.
HIGH VOLTAGE COMPONENTS REMOVAL
(HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY)
To remove the components, proceed as follows.
1. CARRY OUT ;.us on;3D;.us off; CHECKS
2. Disconnect the high voltage wire A from the magnetron.
3. Disconnect the filament lead(shorter one) of the power transformer.
4. Disconnect the high voltage wire of the H.V. rectifier assembly from the high voltage capacitor.
holder from the high voltage capacitor.
7. Disconnect high voltage wire A and terminals of high voltage rectifier assembly from high voltage capacitor.
8. Now high voltage rectifier assembly and capacitor
should be free.
5. Remove one (1) screw holding capacitor holder to the oven cavity.
6. Remove one (1) screw holding earth side terminal of high voltage rectifier assembly, and remove capacitor
CAUTION: WHEN REPLACING HIGH VOLTAGE
RECTIFIER ASSEMBLY, ENSURE THAT THE CATHODE (EARTH) CONNECTION IS SECURELY FIXED TO THE CAPACI­TOR HOLDER WITH AN EARTHING SCREW.
27
Page 30
R-4X55 R-4X55B
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
6.
7.
1.
2.
3.
4.
1
2
MAGNETRON
CARRY OUT 3D CHECKS Disconnect the H.V. wire A and filament lead(longer one) of the transformer from the magnetron. Release the main harness from the tabs of the air duct. Remove the air duct from the oven cavity. Carefully remove four (4) screws holding magnetron to waveguide, when removing the screws holding the magnetron to prevent it fro falling.
REMOVAL
6. Remove the magnetron from the waveguide with care so the magnetron antenna should not hit by any metal object around the antenna
7. Remove the magnetron cushion from the magnetron.
CAUTION: WHEN REPLACING THE MAGNETRON,
BE SURE THE R.F. GASKET IS IN PLACE
.
SCREWS ARE TIGHTENED SECURELY.
OVEN LAMP AND LAMP SOCKET REMOVAL
CARRY OUT 3D CHECKS Remove the snap of the wire tie holding the wire leads to the oven lamp from the hole of the oven cavity.
Remove the one (1) screw holding the magnetron air
guide to the oven cavity.
Lift up the tab holding the oven lamp socket. Remove the oven lamp socket.
Pull the wire leads from the oven lamp socket by push­ing the terminal hole of the oven lamp socket with the flat type small screw driver. Now, the oven lamp socket is free.
Figure C-l Oven lamp socket
TURNTABLE MOTOR REMOVAL
Disconnect the oven from power supply. Remove the turntable and roller stay from the oven
5. Remove the two (2) screws holding the turntable motor
cavity.
to oven cavity bottom side and remove the turntable
Remove the one (1) screw holding the turntable motor
motor.
cover to the bottom plate and remove the cover.
6. Turntable motor is now free. At this time, o-ring and
Disconnect the wire leads from turntable motor.
washer is removed. Do not loose them.
TURNTABLE COUPLING REMOVAL
Remove the turntable motor, refer to “Turntable Motor Removal”.
At the time turntable coupling will be free.
Figure C-2. Turntable Coupling
FAN MOTOR REPLACEMENT
REMOVAL
1. CARRY OUT 30 CHECKS.
2. Disconnect the wire leads from the fan motor.
3. Disconnect the H.V. wire A and the filament lead(longer one) of the power transformer from the magnetron.
4. Release the H.V. wire A and filament lead from the holes in the fan duct.
5. Remove the snap band of the wire leads connected to the oven lamp from the hole of the oven cavity.
6. Remove the one (1) screw holding the magnetron air guide to the oven cavity and remove the magnetron air guide.
7. Release the tabs of the fan duct from the holes in the
9. Now, the fan motor assembly is free. 1 O.Remove the fan blade from the fan motor shaft accord-
ing the following procedure.
1) Hold the edge of the rotor of the fan motor by using a pair of groove joint pliers as shown in Figure C-3(a).
CAUTION:
l
Make sure that any pieces do not enter the gap be-
tween the rotor and the stator of the fan motor.
Because the rotor is easy to be shaven by pliers
and metal pieces may be produced.
*
Do not touch the pliers to the coil of the fan motor
*
because the coil may be cut or injured. Do not transform the bracket by touching with the pliers.
8.
bottom plate and the back plate of the oven cavity. Release the main wire harness from the hole in the fan
2) Remove the fan blade assembly from the shaft of the
duct.
fan motor by pulling fan retainer clip and rotating the fan blade with your hand.
28
Page 31
3)
Now, the fan blade will be free.
CAUTION: * Do not use this removed fan blade again.Because
the hole(for shaft) of it may become bigger than a standard one.
11 .Remove the two (2) screws and nuts holding the fan
motor to the fan duct.
12.Now, the fan motor is free.
INSTALLATION
1. Install the fan motor to the fan duct with the two (2) screws and nuts.
2. Install the fan blade to the fan motor shaft according the following procedure.
1) Hold the center of the bracket which supports the shaft of the fan motor on the flat table as shown in Figure C-
3(b).
2) Apply the screw lock tight into the hole(for shaft) of the fan blade.
Rear view
Side view
.m
R-4X5.5 R4X55B
3) Install the fan blade to the shaft of fan motor by pushing the fan blade with a small, light weight, ball peen ham-
mer or rubber mallet.
CAUTION:
l Do not hit the fan blade strongly when installed
because the bracket may be transformed.
* Make sure that the fan blade rotates smooth after
installed.
l Make sure that the axis of the shaft is not slanted.
3. Re-nstall the main wire leads into the hole in the fan duct.
4. Re-install the fan duct to the oven cavity.
5. Re-install the magnetron air guide to the oven cavity with one (1) screw.
6. Re-install the snap band of the.wire leads to the oven lamp to the hole of the oven cavity.
7. Re-install the H.V. wire A and filament lead into the holes in the fan duct and then re-connect them to the magnetron, referring to the pictorial diagram.
8. Re-connect the wire leads to the fan motor, referring to the pictorial diagram.
\
These are ese are the position the position
-where should be pinched with pliers
/
&Shaft
1.
2.
3.
Figure C-3(a). Fan motor Removal
Figure C-3(b). Fan motor Install
POSITIVE LOCK@ CONNECTOR REMOVAL
Pushing the lever of positive lock@ connector.
H Termina’
Pull down the connector from the terminal. Now, the connector is free.
Note: If the positive lock@ has a insulation sleeve, first
remove it. If you do not so, you can not push the lever of positive lock@.
CAUTION: THE POSITIVE LOCK@ TERMINAL CAN NOT
BE DISCONNECTED BY ONLY PULLING. BECAUSE ONCE YOU (SERVICE PER-
SONAL) HAVE CONNECTED THE POSI­TIVE LOCK@ CONNECTOR TO THE TERMI­NAL, THE POSITIVE LOCK@’ CONNECTOR HAS BEEN LOCKED.
Figure C-4. Positive lock@ connector
CONTROL PANEL ASSEMBLY REMOVAL
1. CARRY OUT 3D CHECKS
3.
2. Disconnect the main harness and low voltage harnes from the control panel.
4
Remove the single (1) screw holding the control panel to the oven cavity. Lift up the control panel assembly and pull it forward. Now, the control panel assembly is free.
29
Page 32
:v
R-4X55
FMX5SB
POWER SUPPLY CORD REPLACEMENT (FOR AUSTRALIA MODEL)
~
Removal
1. CARRY OUT 3D CHECKS.
2. Disconnect the brown wire of the power supply cord from the fuse holder.
3. Remove the connector CE-230 by cutting the con-
nected wire leads to it.
4. Remove the single (1) screw holding the green/yellow wire of the power supply cord to the oven cavity.
5. Remove the single (1) screw holding the cord anchor­age to the oven cavity.
6. Remove the power supply cord from the oven.
Re-install
1.
2.
3.
4.
5.
6.
7.
Insert the power supply cord into the cord anchorages. Connect the brown wire of the power supply cord to the fuse holder.
Install the green/yellow wire of the power supply cord to the oven cavity with the single (1) screw tightly. Make sure that the blue wire and the white wires are stripped for 15 mm length as shown illustlation. Wind the conductors of Blue and White wires each other. Insert the stripped wire leads into the connector CE-
230.
Clamp the connector CE-230 with the correct tool tightly.
Blue wire lead of
power supply cord
main wire harness
Connector CE-230
Cord anchorage 1
i
Power supply cord
Main harness
Green/Yellow wire
konnector CE230
Figure C-5 Power Supply Cord Replacement
(For Australia Model)
POWER SUPPLY CORD REPLACEMENT (FOR NEW ZEALAND MODEL)
Removal
CARRY OUT 30 CHECKS Loosen the two (2) screws holding the brown and blue
1.
2.
3.
4.
5.
wires of the power supply cord to the cord connector on the noise filter.
Loosen the single (1) screw holding the earth angle and earth wire of power supply cord. Remove the single (1) screw holding the cord anchor-
ages to the oven cavity.
Remove the power supply cord.
Note: Step 5 above is important, and it must be done
after replacing power supply cord.
Re-install
1.
2.
3.
4.
5.
Insert the power supply cord into the cord anchorages.
Insert the brown and blue wires of power supply cord into the terminals of cord connector, referring to picto­rial disgram. And tighten the screws.
Insert the earth wire of power supply cord into the earth angle, and tighten the screw holding the earth angle. Tighten the single (1) screw holding the cord anchor­ages. CARRY OUT 4R CHECKS
UPPER LATCH SWITCH, LOWER LATCH SWITCH, STOP SWITCH AND MONITOR SWITCH REMOVAL
1.
2.
3.
4.
CARRY OUTa CHECKS. Remove the air duct from the oven cavity.
5. Remove the two (2) screws holding the latch hook to
Disconnect the main wire harness and switch harness
the oven cavity.
from the control panel.
6. Remove the latch hook.
Disconnect the leads from all switches.
7. Push the retaining tab slightly and remove the switch.
30
Figure C-6. Power Supply Cord Replacement
(For New Zealand Model)
Page 33
R-4H5.5 R-4X55 R-PX55B
UPPER LATCH SWITCH, LOWER LATCH SWITCH, STOP SWITCH AND MONITOR SWITCH ADJUSTMENT
If the lower latch switch, stop switch, upper latch switch and monitor switch do not operate properly due to a mis­adjustment, the following adjustment should be made.
1.
2.
3.
4.
5.
CARRY OUT 3D CH&&
Loosen the two (2) screws holding the latch hook to the oven cavity front flange. With door closed, adjust the latch hook by moving it
back and forward, or up and down. In and out play of the door allowed by the latch hook should be less than
0.5 mm. The horizontal position of the latch hook should be placed where the stop switch and monitor switch have activated with the door closed. The vertical position of the latch hook should be placed where the lower latch switch and upper latch switch have activated with the door closed. Secure the screws with washers firmly.
Make sure of the upper latch switch, stop switch, lower
latch switch and monitor switch operation. If those switches have not activated with the door closed, two
(2) screws holding latch hook to oven cavity front flange and adjust the latch hook position.
After adjustment, make sure of following:
1. In and out play of door remains less than 0.5 mm when latched position. First check latch hook position, push­ing and pulling the door toward the oven face. The re-
sults (plays of the door) should be less than 0.5mm.
2. The upper latch switch and lower latch switch interrupt the circuit before the door can be opened.
3. The monitor switch contacts close when the door is opened.
4. The stop switch contacts open when the door is opened.
5. Reinstall outer case and check for microwave leakage around the door with an approved microwave survey meter. (Refer to Microwave Measure ment Procedure.)
LATCH
MONITOR
HOOK \
, SWITCH
LEJ
V
SWITCH
Figure C-7 Latch Switches Adjustment
DOOR REPLACEMENT AND ADJUSTMENT
DOOR REPLACEMENT
1. CARRY OUT 3D CHECKS
2. Remove two (2) screws holding the lower oven hinge to the oven cavity. The lower oven hinge is now free.
3. Release the door assembly from the upper oven hinge.
4. Remove door assembly.
5. Door assembly is now free.
6. Re-install upper oven hinge to the new door assembly.
7. On re-installing new door assembly, secure the lower oven hinges with the two (2) mounting screws to the
oven cavity. Make sure the door is parallel with bottom line of the oven face plate and the latch heads pass through the latch holes correctly.
DOOR ADJUSTMENT
When removing and/or loosening hinges such as in door
replacement, the following adjustment criteria are taken. Door is agjusted to meet the following three conditions by
keeping screws of hinge loose.
LOWER LATCH SWITCH
LATCH ____----
1. Adjust door latch heads at a position where they smoothly catch the latch hook through the latch holes. Refer to latch switch adjustments.
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. Reinstall outer case and check for microwave leakage around the door with an approved microwave survey meter. (Refer to Microwave Measure ment Procedure.)
r
ER E
CABINET
Figure C-8. Door Assembly Replacement and Adjustment
31
Page 34
CHOKE
1.
2.
Insert
COVER REMOVAL
an iron plate(thickness of about OSmm) or flat
type screw driver to the gap between the choke cover
and door panel as shown in the figure to free the engag-
ing part. Lift up the choke cover, now cover is free.
Ii!
FLAT TYPE
l-l
SCREW-DRIVER
PROTECT BY TAPE
Figure C-9. Choke Cover Removal
DOOR PARTS REMOVAL
Remove the door assembly, referring to from item 1
through item 5 of “DOOR REPLACEMENT”.
1. Place the door assembly on a soft cloth with latch heads facing up.
2. Remove the choke cover, referring to “CHOKE COVER REMOVAL”.
LATCH HEAD REMOVAL
3. Lift up the latch head towards the direction that the ar-
4.
row shows in the figure C-10, and release the latch head from the holes in the door panel Release the latch spring with the latch head from the
tabs of the door panel.
5.
Release the latch spring from the latch head.
6.
Now, the latch head is free.
LATCH HEAD RE-INSTALL
1. Pick up the latch spring and catch the one ring of the latch spring on the tab of the door panel as shown in
Figure C-i 0.
2. Catch the other ring of the latch spring on the tab of the
latch head.
3. Install the latch head to the holes in the door panel.
Door
I
Panel\‘* fp
Latch ’
head
Tab of the door panei
Figure C-10. Latch head removal and reinstall
SEALER FILM
Removal
1. Tear the sealer film from the door panel.
2. Now, the sealer film is free.
Installation
1. Put the adhesivetape on the backing film of the sealer film.
2. Tear the backing film by pullingthe adhesivetape.
3. Put the pasted side of the sealer film on the door panel.
Sealer film
\
Backing film
/
Sealer film
32
Page 35
MICROWAVE MEASUREMENT
After adjustment of door latch switches, monitor switch and doorare completed individually or collectively, the fol-
lowing leakage test must be performed with a survey in-
strument 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 ofthe oven.
PREPARATlbN 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.
Recommended instruments are: NARDA 8100 NARDA 8200 HOLADAY HI 1500
SIMPSON 380M
2. Place the oven tray into the oven cavity.
3. Place the load of 275 +15ml of water initially at 20 +5X 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.
4. Close the door and turn the oven ON with the timer set
for several minutes. If the water begins to boil before the survey is completed, replace it with 275ml of cool water.
5. Move the probe slowly (not faster that 2.5cm/sec.)
along the gap.
6. The microwave radiation emission should be measured
at any point of 5cm or more from the external surface of the oven.
Microwave leakage measurement at 5 cm distance
33
Page 36
NOTE: WEIGHT SENSOR IS USEDFOR MODEL R-4X55 AND
R- 4X55B
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Figure O-l(a). Oven Schematic-OFF Condition (For Australlia model)
NOTE: WEIGHT SENSOR IS USEDFOR MODEL R-4X55 AND
R- 4X55B
Figure 0-2(a). Oven Schematic-ON Condition (For Australlia model)
34
Page 37
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Figure O-l(b). Oven Schematic-OFF Condition (For New Zealand model)
--
1
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1
&$j
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b-b-3 55n
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Figure 0-2(b). Oven Schematic-ON Condition (For New Zealand model)
35
Page 38
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40
Page 43
PARTS LIST
R-4H55 R-4X55 R-4X55B
Note: The voltage supllied to the part “*” are greater than 25OV.
REF. NO.
PART NO.
I
DESCRIPTION
W-Y CODE
ELECTRICAL PARTS
t
l
l
l
*
I- 1 I- 2 I- 3 L- 4 l- 5 L- 6 l- 6 l- 7 l- 8
l- 9
l-10
l-11
l-12 1-13 1-14 1-14 1-15 l-15 1-16 l-17 1-18 1-19 l-20 1-21
QFS-TA014WREO QFSHDA002WREO QSW-MAlllWREO QSW-MAllOWREO RTHM-AO57WREO
__--
QACCAAO38WREO QACCAAO39WREO FWQZAO7OWRKO
RC-QZAO75WREO
QSOCLAOllWREO
RLMPTA029WREO
QFS-CAOlOWREO
RMOTEA255WREO RTRN-A288WREO RV-MZAO89WREO RV-MZA108WREO RMOTDA133WREO RMOTDAl75WREO RR-WZAO03WREO QSW-MAllOWREO QSW-MAllOWREO
FPWBFA232WRKO FDTCTAl15WRKO FDTCTAl39WRKO
Temp. fuse 150-C (MG) 1 Fuse holder (For Australian Model)
1 Monitor switch (V-16G-2C25(R)) 1 Upper latch switch (V-16G-3C25(R))
1
TC: Thermal cut-out 145-C (OVEN) 1
-Powersuppiy..co;h-iForAustralian Modei ,--~----­1
Power supply cord (For New Zealand Model)
1
H.V. rectifier assembly 1 High Voltage capacitor 1 Oven lamp socket
1
Oven lamp
1
Fuse M8A
1
Fan motor
1
Power transformer
1
Magnetron (For Australian Model) Magnetron (For New Zealand Model)
1 1 11
Turntable motor [R-4H551
1
Turntable motor [R-4X55, R-4X55Bl
1
Monitor resistor 0.8R 20W
1
Lower latch switch (V-l6G-3C25(R) 1
1 1
Stan switch (V-16G-3C25(R))
11
Noise filter (For New Zealand Model) 1
AH sensor assembly
1
Weight sensor assembly [R-4X55, R-4X55Bl 1
AG AF AK AK AG Ax Ax AY
AU AH AL AE BB BM BF EG BE AM AG AK AK Aw
BF
AQ
CABINET PARTS
2- 1 2- 2 2- 2 2- 3
2- 4 2- 5 2- 5 2- 6
FHNG-A172WRTO
Lower oven hinge
GCABUA415WRPO
Outer case cabinet [R-4H55, R-4X551
GCABUA429WRPO
Outer case cabinet [R-4X55Bl
MHNG-A28OWRTO
Upper oven hinge
PCOVPA249WRPO
Turntable motor cover
PCAPHA015WREO
Cabinet cap [R-4H55, R-4X551
PCAPHA009WREO
Cabinet cap [R-4X55Bl
GLEGPAO23WREO Foot
AM BE BE AM AK AD AC AC
CONTROL PANEL PARTS
3- 1
CPWBFA53OWRKO
Control unit (New Zealand only) [R-4X55,R-4X55Bl 1 BT
3- 1
CPWBFA529WRKO
Control unit (Not Replaceble Item) [R-4H551
1
BS
3- 1A QCNCMA234DREO
$-pin connector (A)
1 AC
3- 1B QCNCMA275DREO 2-pin connector (B)
1 AB
3- 1c QCNCMA237DREO
3-pin connector (F)
1 AD
3- 1D QCNCWAO30DREO
12-pin connector (G)
1 AE
3- 1E QCNCMA039DREO
3-pin connector (C) 1 AB
3- 1E RV-KXA037DREO Fluorescent display tube
1
AU
Cl RC-KZA087DREO Capacitor O.luF 5ov
1 AA
c2
VCEAB31VW108M Capacitor 1OOOuF 35V 1 AF
c3
vCEAB31EW476M
Capacitor 47uF 25V
1 AA
c4 VCKYBllEX153N Capacitor 0.015uF 25V
1 AA
c5
VCEAB31CW476M
Capacitor 47uF 16v
1AA C6-7 VCKYDllCY103N Capacitor O.OluF 16V 2 AA C8 VCTYF31EF1042
Capacitor O.luF 25V
1AE Cl0
RC-KZA087DREO
Capacitor
O.lLlF 5ov
1AA
Cl3
RC-KZA087DREO Capacitor
O.luF 5ov
1 AA c20 VCKYDllCYlO3N Capacitor O.OluF 16V 1AA
c21 VCTYF31HF103Z Capacitor O.OluF 50V 1 AA c30
RC-KZA087DREO
Capacitor O.luF 50V[R-4X55,R-4X55B] 1 AB
c31
VCEAB31CW476M Capacitor
47uF 16V
1AA
C60 VCKYDllCY103N
Capacitor O.OluF 16V 1AA
c70
RC-KZA127DREO
Capacitor 0.15uF SOV(TF) [R-4X55,R-4X55Bl 1 AA
c71
VCKYDllCY103N
Capacitor O.OluF 16V[R-4X55,R-4X55B] 1AA
C80 VCEAB31HW104M
Capacitor
O.luF 50V
1 AM
C81
VCEAB3lVW475M Capacitor
4.7uF 35v
1AA
Cl00
RMPTEA009DREO
Capacitor array 330pF x 4 1 AE
CFl
RCRS-AOl2DREO
Ceramic resonator CST4.OOMGW
1AD
Dl-4
VHDllESl///-1
Diode (11ESl) 4 AB
D60-61
VHDlSS270A/-1
Diode (lSS270A)
2 AA
41
Page 44
WH55 R-4X55 R-4X550
Note: The voltage supllied to the pat-l “*” are greater than 250V.
REF. NO. 1 PARTNO.
I
DESCRIPTION
1 Q’TY ICODI
D70
VHDlSS27OA/-1
Diode (lSS270A) [R-4X55,R-4X55B]
1AA
D81-82
VHDlSS27OA/-1
Diode (lSS270A)
2 AT4
D91-92
VHDlSS27OA/-1
Diode (lSS270A)
2 AA
D94-98
VHDlSS27OA/-1
Diode (lSS270A)
5 AA
ICl
RH-IZA506DREO
LSI
1 AV
IC2
RHIZA310DREO IC
1AL
IC3
RH-IZA337DREO
IC (x24COlCP) [R-4XSS,R-4X55B]
1 AK
IC4
RH-IZA426DREO
IC (TL082CP) [R-4XSS,R-4X55B]
1AE
Ql
VS2SB793///-4
Transistor (2SB793)
1 AC
0 02
VSDTA143ES/lB
Transistor (DTA143ES)
1 AA
VS2SA933S//-3
Transistor (2SA933S)
1AA
Q80
VSDTA114YS/-3
Transistor (DTA114YS)
1AB
Q81
VSDTD143ES/-3
Transistor (DTD143ES)
1 AC
Q82
VSDTB143ES/-3 Transistor (DTB143ES)
1AB
($10-113 VS2SC174OS/-3
Transistor (2SC174OS)
4 AA
Rl
VRD-B12EF432J Resistor 4.3k ohm
1/4w
1AA
R2
VRD-B12EF102J Resistor
lk ohm 1/4W[R-4X55,R-4X55B]
1AA
R2
VRD-B12EF152J Resistor 1.2k ohm
1/4W[R-4H55] 1AA
RI?
VRD-B12HF621J Resistor 620 ohm
1/2W[R-4X55,R-4X55B] 1 AA
R.3
VRS-B13AA621J Resistor 620 ohm
lWTR-4H55] 1AB
R4
VRD-B12HF751J Resistor 750 ohm
1/2w
1AA
R5 VRD-B12EFlO2J Resistor
lk ohm 1/4w
1AA
R6 VRD-B12EF153J Resistor 15k ohm
1/4w
1AA
R7
VRD-B12HF51OJ Resistor 51 ohm 1/2W[R-4X55,R-4X55B]
1AA
R20
VRD-Bl2EF153J
Resistor 15k ohm
1/4w
1 AA
R30
VRD-B12EF332J Resistor 3.3k ohm 1/4w
1AA
R31
VRD-B12EFl03J Resistor 10k ohm 1/4W[R-4X55,R-4X55B] 1AA
R32
VRD-Bl2EF272J Resistor 2.7k ohm 1/4W[R-4X55,R-4X55B] 1AA
R33 VRD-B12EF332J
Resistor 3.3k ohm 1/4w 1AA
R40 VRD-B12EF332J
Resistor 3.3k ohm 1/4w 1A.A
R41
VRD-B12EFlOZJ Resistor
lk ohm 1/4w 1AA
R51
VRS-Bl3AA331J Resistor
330 ohm 1w
1AA
R60 VRD-B12EF512J
Resistor 5.lk ohm
1/4w 1AA
R61 VRD-Bl2EFlOlJ
Resistor
100 ohm 1/4w
1AA
R70-71
VRD-B12EF106J
Resistor
1OM ohm 1/4W[R-4X55,R-4X55B] 2 AA
R72
VRN-B12EK683J
Resistor
R73
68k ohm(F) 1/4W[R-4X55,R-4X55B]
1AA
VRN-Bl2EK244F
Resistor
1AA
R74
'VRN-B12EK683F
240k ohm(F) 1/4W[R-4X55,R-4X55B]
Resistor
1AA
R75
68k ohm(F) 1/4W[R-4X55,R-4X55B]
VRN-B12EK244F
Resistor
R76-77
240k ohm(F) 1/4W[R-4X55,R-4X55B]
1PA
VRNB12EKl53F
Resistor 15k ohm(F) 1/4WTR-4X55,R-4X55B]
R78
2 AA
VRNB12EK752F
Resistor
R79
7.5k ohm(F) 1/4W[R-4X55,R-4X55B]
1AA
VRD-B12EF473J
Resistor
47k ohm
R80
1/4W[R-4X55,R-4X55B]
1AA
VRD-B12EF471J
Resistor
470 ohm
1/4w
R91-92
1AA
VRD-B12EF103J
Resistor
10k ohm
1/4w
R94-98
2 AA
VRD-B12EFl03J
Resistor
10k ohm
1/4w
RlOO-103 VRD-Bl2EF103J
5 AA
Resistor
10k ohm
1/4w
R104
RR-DZA143DREO
4 AA
RllO-113 VRD-Bl2EF104J
Resistor array 150k ohm x 4
1
AC
Resistor 1OOk ohm
1/4w
RYl
RRLY-A080DREO
4 AA
Relay (OJ-SH-124LM)
RY2
1
RRLY-A076DREO
AG
Relay (OMIF-S-124LM)
. .
SP40
RALM-A014DREO.
1 AK
Tl
Buzzer (PKM22EPT-CA THAI)
RTRNPA064DREO
1 AG
Transformer
VRSl
RH-VZAOlODREO
Varistor (TNRl5G471K)
1AS
ZDl
VHEHZ6A3///-1
1AE
Zener diode (HZ6A-3)
ZD2
VHEHZ183///-1
1
AC
ZD2
VHEHZ161///-1
Zener diode (HZ18-3) [R-4X55,R-4X55B] Zener diode (HZ16-1) [R-4H55]
1AH
ZD3
RH-EZA105DREO
3- 2
Zener diode (RD4.3ESB2)
1AA
FPNLCB023WRKO
3- 2
FPNLCB024WRKO
Control Panel frame with key unit[R-4X55]
1AA
Control Panel frame with key unit[R-4H55]
1BC
3- 2
FPNLCB037WRKO
lE?C
3- 3
JBTN-A817WRFO
Control oanel frame with key unit[R-4X55B]
1BC
3- 3
Gpen button[R-4H55,R-4X55]
J-BIN-A818WRFO
1AK
3- 4
Open button[R-4X55B]
MSPRCAOSOWREO
Open button spring
1AL
3- 5
XEPSD30PlOXSO
Screw;Control unit mounting
1AB
3 AA
OVEN PARTS
4- 1
LBNDKAO38wRPO
4- 2
Capacitor
holder
LSTPPA069WRFO
Cord anchorage (upper)
1AH 1AE
42
Page 45
Note: The voltage supllied to the part ,,*‘I are greater than 25OV.
REF. NO.
PART NO.
DESCRIPTION
Q’TY CODE
4- 3 LSTPPA070WRFO Cord anchorage (lower) 1 AD 4- 4 FDAI-A15OWRYO Bottom plate 1 AY 4- 5 PDUC-A406WRFO Air duct 1 AK
4- 6 PHOK-A076WRF0 Latch hook 1 AQ 4- 8 FDUC-A222WRYO Sensor duct 1 AG
a- 'I
PCUSUA23'IWRPO Waterproof cushion
1 AF 4- 9 FOVNA21OWRTO Oven cavity [R-4H551 1 BK 4- 9 FOVNA259WRTO Oven cavity [R-4XSS,R-4X55B] 1 BP 4-10 PCUSUA368WRPO Cushion 1 AK
4-11
MLEVPAl66WRFO
Latch lever
1AE 4-12 FROLPAO47WRKO Roller stay 1 AW 4-13 NTNT-A036WREO Turntable 1 Ax
4-14
GFTA-AOO8WRWO
Oven lamp access cover
1AF 4-15 NCPL-A015WRFO Turntable coupling 1 AD
4-17
PCOVPA212WREO
Waveguide cover
1AF 4-18 PCUSUA157WRPO Cushion 1 AC
4-19
PCUSUA300WRPO
Cushion
1Ai-l 4-20 PPACGA096WREO O-ring 1 AG
4-21
PFILWA041WREO
Oven lamp filter
1AA 4-23
PGIDHAO44WRPO
Magnetron air guide
1AM 4-24
LANGQAl67WRMO
Earth angle (For New Zealand Model)
1AB 4-25
LANGQA288WRPO
Noise filter angle (For New Zealand Model)
1
AC
4-26 PCUSGA322WRPO Cushion 2 AF 4-27
PCUSGA321WRPO
Cushion
1AH 4-28
PCUSUA278WRPO
MG cushion
1AF 4-29 PCUSGA339WRPO Trans. cushion 2 AG 4-30 NFANJAO2OWREO Fan blade 1 AG 4-31 PDUC-A468WRFO Fan duct 1 AR
4-32
LANG-AO4lWRPO
Weight sensor support [R-4X55,R-4X55B]
1 AU 4-33 PCUSUA369WRPO Cushion [R-4X55,R-4X55B] 1 AM
DOOR PARTS
5
CDORFA589WRKO
Door assembly, complete.[R-4H55,R-4X55]
1BN
5
CCORFA596WRKO
Door assembly, complete.[R-4X55Bl
1BN
5- 1 FCORFA226WRTO Door panel [R-4H55,R-4X55] 1x 5- 1 FCORFA229WRTO Door panel [R-4X55B] 1BG 5- 2 GCOVHA233WRFO Choke cover [R-4H55,R-4X55] 1AK 5- 2 GCOVHA228WRFO Choke cover [R-4X55B] 1AF 5- 3 LSTPPA093WRFO Latch head [R-4H55,R-4X55] 1AF 5- 3 LSTPPA090WRFO Latch head [R-4X55B] 1AF 5- 4 MSPRTAl14WREO Spring 1AD 5- 5 HPNL-A515WREO Door screen [R-4H55,R-4X55] 1AX 5- 5 HPNL-A498WREO Door screen [R-4X55B] 1 AU 5- 6 PSHEPA336WRPO Sealer film 1AF 5- 7 GWAKPA238WRFO Door frame [R-4H55,R-4X55] 1AX 5- 7 GWAKPA239WRFO Door frame [R-4X55B] 1 Aw
MISCELLANEOUS
6- 1 TCAIXA439WRRO Cook book 1AX 6- 2 TINS-A388WRRO Instruction book [R-4H55] 1 AQ
6- 2 TINS-A387WRRO Instruction book [R-4X55,R-4X55B] 1AP 6- 3 TCAUHA185WRRO Microwave caution (New Zealand Model) 1 AG
6- 4
QTANPOOZOYBEO
Connector CE-230 (Australian model)
1AA
6- 5
QW-QZA14lWREO Hiqh voltaqe wire A
1AH 6- 6 TCAUHAO55WRRO Caution label 1AF 6- 7 TLABSAO29WRRO M8A label (Australian Model) 1 AC 6- 8 FW-VZB137WREO Main wire harness (Australian Model) 1 AY 6- 8 FW-VZB138WREO Main wire harness (New Zealand Model) 1 AY 6- 9 FW-VZB139WREO Low voltage harness 1AM 6-10 TSPCNB88OWRRO Rating label [R-4H551 1 AG
6-10
TSPCNB876WRRO Rating label [R-4X55; Australian Model3
1 AG 6-10 TSPCNB879WRRO
Rating label [R-4X55; New Zealand Model]
1 AG 6-10 TSPCNB916WRRO Rating label [R-4X55B] 1 AG 6-11
TGANA069WRRO Guarantee card (Australian Model)
1
AG
6-11 TGAN-A002WRRO
Guarantee card (New Zealand Model)
1AB 6-12
LBNDKAO8OWREO
Wire holder B [R-4X55,R-4X55B]
1AD 6-13 TLABMA351WRRO
Menu label [R-4H55]
1AH 6-13
TLABMA35OWRRO Menu label [R-4X55,R-4X55B]
1AH
43
Page 46
Note: The voltage supllied to the part “*” are greater than 25OV.
REF. NO.
PART NO.
DESCRIPTION
Q’TY CODE
6-14
UAMI-AO83WRFO
Defrost rack [R-4X55,R-4X55B]
1AS
6-15 LHLDWAO13WREO
Purse lock LL [R-4X55,R-4X55B]
1
AC
6-16
LBNDKAO49WREO
Wire tight
1 AB
6-17
PTUBUAO03WREO
Tube 110
1AF
6-18
PTUBUAOO4WREO
Tube 220
1 AK
SCREWS, NUTS AND WASHERS
7- 1 XFPSD3OPlOOOO
Screw; M3 x 10 zinc plated steel(Australian Model)
1 AB
7- 2
XOTSD4OP12RVO
Screw; M4 x 12 9 AB
7- 2 XOTSD4OP12RVO
Screw; M4 x 12 (New Zealand Model)
9 AB
7- 3
XOTSD40P12000
Screw; M4 x 12
7 AA
7- 5
XFTSD4OP3OOOO
Screw; M4 x 30 zinc plated steel
1AA
7- 6
LX-CZ0052WREO
Special
screw;
2 AA
7- 7 LX-EZA036WREO
Special screw
2 AA
7- 8
XOTSE4OPO8000
Screw; M4 x 8 [R-4H55,R-4X55] 4 AB
7- 8 XOTSF40P08000
Screw; M4 x 8 [R-4X55B] 4 AB
7- 9
XFPSD30P06000
Screw; M3 x 6 zinc plated
steel
4 AA
7-10
XFPSD4OP08KOO
Screw; M4 x 8 zinc plated steel (Australian Model) 2 AA
XFPSD40P08KOO
Screw; M4 x 8 zinc plated steel(New Zealand Model) 3 AA
7-11
XFPSD4OP08000
Screw; M4 x 8 zinc plated steel [R-4H55] 6 AA
7-11 XFPSD40P08000
Screw; M4 x 8 zinc
7-12
plated steel [R-4X55,R-4X55B]
8 AA
XHTSD4OP08RVO
Screw; M4 x 8 zinc plated steel (Australian Model) 5 AA
7-12
XHTSD40P08RVO
7-13
Screw; M4 x 8 zinc plated steel (New Zealand Model)
6 AA
LX-WZA004WREO
Washer:
1AA
7-14 XBTSD4OPO8RVO
Screw: M4
x 8
1AA
7-18
XWHNZ40-05080
Washer;
1AA
7-20
XBTUW40P08000 Screw; M4 x a
1 AA
7-21 XCPSD30P08XOO
Screw; x
M3 8
7-22
2 AA
XBPSD4OP25000
Screw; M4 x 25
2 AA
7-23
XNESD40-32000 Nut;
2 AA
7-24
XWVSD40-05000
Washer:
7-25
1AA
XFTSD40PlOOOO Screw; M4 x 10
1AA
HOW TO ORDER REPLACEMENT PARTS
To have your order filled promptly and correctly, please furnish the following information.
1. MODEL NUMBER
3. PART NO.
2. REF. NO.
4. DESCRIPTION
PACKING AND ACCESSORIES
PACKING ADD KIT
\
-(cPAcBAI 13WRKO) 1
-->
I-----: -
1. (’
-_-.--
.- ~.
i
,I
PACKING CASE
44
Page 47
1
I
2
I
3
I
4
I
5
I
6
OVEN AND CABINET PARTS
R-4HSS R-4X55 R-4X55B
A
B
C
D
E
F
G
H
Page 48
A-4H55 R-4X55 w4X55B
A
B
C
D
E
F
G
H
I
1
I
2
I
3
I
4 I
5
I
6
CONTROL PANEL PARTS
a
P
b
3-5
,a
4
DOOR PARTS -
/-
J/e
/-
/’
/’
/-
,-
/’
/’
/’
.’
.’
_*’
z’
c’
/’
I’
,’
Actual wire harness may be different than illustration.
1
I
2
I
3 I
4
I
5
I
6
‘93 SHARP CORP. (09KO 75E) Printed in Australia
46
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