Sharp Carousel R-210D User manual

R-210D
In interests of user-safety the oven should be restored to its original
condition and only parts identical to those specified should be used.
MODEL R-210D
S5001R210DPJ/
MICROWAVEOVEN
TABLE OF CONTENTS
CAUTION, MICROWAVE RADIATION................................................................................................................. 1
WARNING..............................................................................................................................................................1
PRODUCT SPECIFICATIONS ............................................................................................................................. 2
GENERAL INFORMATION....................................................................................................................................2
APPEARANCE VIEW ........................................................................................................................................... 3
OPERATION SEQUENCE.................................................................................................................................... 4
FUNCTION OF IMPORTANT COMPONENTS .................................................................................................... 5
SERVICING ...........................................................................................................................................................6
TEST PROCEDURE ............................................................................................................................................. 8
TOUCH CONTROL PANEL .................................................................................................................................14
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ............................................................... 18
MICROWAVE MEASUREMENT ........................................................................................................................ 24
WIRING DIAGRAM ............................................................................................................................................. 25
PICTORIAL DIAGRAM ....................................................................................................................................... 26
CONTROL PANEL CIRCUIT ...............................................................................................................................27
PRINTED WIRING BOARD .................................................................................................................................28
PARTS LIST ....................................................................................................................................................... 29
SHARP CORPORATION
SERVICE MANUAL
MED
MED LOW
DEFROST
LOW
MED
HIGH
HIGH
0
123456
7
8
9
10
11
12
13
1415
20
25
30
1.0 0.5
DEFROST(kg)
DINNER PLATE
REHEAT 1 SERVE (400g)
SOUP
DEFROST
FRESH VEGETABLES
MED
7-8
min.
REHEAT 1 cup (250ml)
HIGH
2-2
1/2min.
COOK 250g
Check chart in Operation Manual
HIGH
3-4
min.
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R-210D

R-210D
1
SERVICEMANUAL
SHARP CORPORATION
OSAKA, JAPAN
MICROWAVE OVEN
R-210D
GENERAL IMPORTANT INFORMATION
ThisManualhasbeenpreparedtoprovideSharpCorp.Service
engineers with Operation and Service Information.
It is recommended that service engineers carefully study the
entire text of this manual, so they will be qualified to render
satisfactory customer service.
CAUTION
MICROWAVE RADIATION
DO NOT BECOME EXPOSED TO RADIATION FROM
THE MICROWAVE GENERATOR OR OTHER PARTS
CONDUCTING MICROWAVE ENERGY.
Serviceengineersshouldnotbeexposedtothemicrowave
energy which may radiate from the magnetron or other
microwave generating devices if it is improperly used or
connected. All input and output microwave connections,
waveguides, flanges and gaskets must be secured. Never
operate the device without a microwave energy absorbing
load attached. Never look into an open waveguide or
antenna while the device is energized.
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.
Allthepartsmarked"*" on parts list are used at voltages more
than 250V.
Removal of the outer wrap gives access to potentials above
250V.
All the parts marked "∆" on parts list may cause undue
microwave exposure, by themselves, or when they are dam-
aged, loosened or removed.
TEST PROCEDURE
SERVICING AND
TROUBLESHOOTING CHART
FUNCTION OF IMPORTANT
COMPONENTS
OPERATING SEQUENCE
APPEARANCE VIEW
PRODUCT SPECIFICATIONS
WIRING DIAGRAM
PARTS LIST
MICROWAVE MEASUREMENT
TOUCH CONTROL PANEL
ASSEMBLY
COMPONENT REPLACEMENT
AND ADJUSTMENT PROCEDURE

R-210D
2
GENERAL INFORMATION
WARNING
THIS APPLIANCE MUST BE EARTHED
IMPORTANT
THE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING CODE:
GREEN-AND-YELLOW : EARTH
BLUE : NEUTRAL
BROWN : LIVE
ITEM DESCRIPTION
Power Requirements 230 - 240 Volts
50 Hertz
Single phase, 3 wire earthed
Power Consumption 1.16 kW
Power Output 800 watts nominal of RF microwave energy (IEC Test Procedure)
Operating frequency 2450 MHz
Case Dimensions Width 460 mm
Height290 mm including foot
Depth 372 mm
Cooking Cavity Dimensions Width 314 mm
Height228 mm
Depth 329 mm
Turntable diameter 295mm
Control Complement Light up dial timer (30 minutes)
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
Set Weight (Approx.) 14 kg
PRODUCT SPECIFICATIONS

R-210D
3
APPEARANCEVIEW
CONTROL PANEL
OVEN
7. Coupling
8. Control panel
9. Waveguide cover
10.Power supply cord
11.Turntable
12.Roller stay
1. Ventilation openings
2. Oven lamp
3. Door hinges
4. Door safety latches
5. See through door
6. Door seals sealing surfaces
MED
MED LOW
DEFROST
LOW
MED HIGH
HIGH
0
123456
7
8
9
10
11
12
13
1415
20
25
30
1.0 0.5
DEFROST(kg)
DINNER PLATE
REHEAT 1 SERVE (400g)
SOUP
DEFROST
FRESH VEGETABLES
MED
7-8 min.
REHEAT 1 cup (250ml)
HIGH
2-2 1/2min.
COOK 250g
Check chart in Operation Manual
HIGH
3-4 min.
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POWER LEVEL INDICATOR
POWER LEVEL BUTTON
There are five power levels. The approximate
percentageofmicrowavepowerforeachsetting
is:
HIGH 100%
MED HIGH (MEDIUM HIGH) 70%
MED (MEDIUM) 50%
MED LOW/DEFROST 30%
(MEDIUM LOW/DEFROST)
LOW 10%
LIGHT UP DIAL (0-30 minutes)
Turnrighttosetcookingtimeorweightofdefrost
food.
Turn left to set demonstration mode.
MEAT DEFROST GUIDE
9
2
5
44
7
11
3
6
8
12
10
1

R-210D
4
OPERATION SEQUENCE
OFF CONDITION
Closing the door activates all door interlock switches
(1st. latch switch, 2nd. latch switch and stop switch).
IMPORTANT
Whentheovendoorisclosed,themonitorswitchcontacts
(COM-NC) must be open.
Whenthemicrowaveovenispluggedinawalloutlet,rated
voltage is supplied to the noise filter and the control unit.
Figure O-1 on page 25
MICROWAVE COOKING CONDITION
HIGH COOKING
Select the power level HIGH by pressing the power level
button until the power level indicator indicates "HIGH".
And set the cooking time by rotating the Light Up Dial.
Function sequence
Figure O-2 on page 25
CONNECTED COMPONENTS RELAY
Oven lamp, Fan motor, Turntable motor RY1
Power transformer RY2
1. Ratedvoltage is suppliedtothe primary windingofthe
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 sec-
ondary winding.
2. The filament winding voltage (3.3 volts) heats the
magnetronfilamentandthehighvoltage(2000volts)is
sentto the voltage doublingcircuit, where it isdoubled
to negative voltage of approximately 4000 volts D.C..
3. The 2450 MHz microwave energy produced in the
magnetron generates a wave length of 12.24 cm. This
energyischannelledthroughthewaveguide(transport
channel)intotheovencavity,wherethe food is placed
to be cooked.
4. Whenthecookingtimeisup,asignaltoneisheardand
the relays RY1+RY2 go back to their home position.
The circuits to the oven lamp, power transformer, fan
motor and turntable motor are cut off.
5. When the door is opened during a cook cycle, the
switches come to the following condition.
CONDITION
DURING DOOR OPEN
SWITCH CONTACT COOKING (NOCOOKING)
1st. latch switches COM-NO Closed Open
2nd. 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, turn-
tablemotorandtheovenlamparecutoffwhenthe1st.
latch switch, 2nd. latch switch, and stop switch are
made open.
6. MONITOR SWITCH CIRCUIT
The monitor switch is mechanically controlled by oven
door, and monitors the operation of the 1st and 2nd.
latch switches.
6-1 When the oven door is opened during or after the
cycle of a cooking program, the 1st. latch and stop
switch must open their contacts first. After that the
contacts (COM-NC) of the monitor switch can be
closed and the contacts (COM-NO) of the 2nd. latch
switch can be opened.
6-2. When the oven door is closed, the contacts (COM-
NC) of the monitor switch must be opened and the
contacts (COM-NO) of the 2nd. latch switch must be
closed. After that the contacts of the 1st. latch switch
and stop switch are closed.
6-3. Whentheovendoorisopenedandthecontactsofthe
1st and 2nd latch switches remain closed. The fuse
M8A will blow, because the monitor switch is closed
and a short circuit is caused.
MEDIUM HIGH, MEDIUM, MEDIUM LOW, LOW
COOKING
When the microwave oven is preset for variable cooking
power, rated voltage is supplied to the power transformer
intermittently within a 27-second time base through the
relay contact which is coupled with the current-limiting
relay. The following levels of microwave power are given.
SETTING;
NOTE: The ON/OFF time ratio does not exactly corre-
spond to the percentage of microwave power,
because approx. 2 seconds are needed for heat-
ing up the magnetron filament.
HIGH 27 sec. ON
MEDIUM HIGH Approx. 70%
21 sec. ON 6 sec. OFF
12 sec. OFF
18 sec. OFF
22 sec. OFF
MEDIUM Approx. 50%
15 sec. ON
MEDIUM LOW Approx. 30%
9 sec. ON
LOW Approx. 10%
5 sec. ON

R-210D
5
FUNCTION OF IMPORTANT COMPONENTS
Figure D-1. Door Open Mechanism
1ST.LATCHSWITCH,2ND.LATCHSWITCH AND
STOP SWITCH
1. Whentheovendoorisclosed,thecontacts(COM-NO)
must be closed.
2. When the oven door is opened, the contacts (COM-
NO) must be opened.
MONITOR SWITCH
1. Whentheovendoorisclosed,thecontacts(COM-NC)
must be opened.
2. When the oven door is opened, the contacts (COM-
NC) must be closed.
3. Iftheovendoorisopenedandthecontacts(COM-NO)
ofthe1stlatchswitchand2ndlatchswitchfailtoopen,
the fuse blows simultaneously with closing the con-
tacts (COM-NC) of the monitor switch.
CAUTION: BEFORE REPLACING A FUSE TEST THE
1STLATCHSWITCH,2NDLATCHSWITCH,
MONITOR SWITCH AND MONITOR RE-
SISTOR R FOR PROPER OPERATION.
(REFER TO CHAPTER "TEST PROCE-
DURE".)
MONITOR RESISTOR 0.8Ω20W
The monitor resistor prevents the fuse bursting when
the fuse blows due to the operation of the monitor
switch.
FUSE
1. Thefuseblowswhenthecontacts(COM-NO)ofthe1st
latch switch and 2nd latch switch remain closed with
the oven door open and when the monitor switch
closes.
2. If the wire harness or electrical components are short-
circuited, the fuse M8A blows to prevent an electric
shock of fire hazard.
HIGH VOLTAGE FUSE
Thehighvoltagefuseblowswhenthehighvoltagerectifier
or the magnetron is shorted.
THERMAL CUT-OUT 125˚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
improper setting of cook time or failure of control unit.
Under normal operation, the thermal cut-out remains
closed.However,whenabnormallyhightemperaturesare
reached within the oven cavity, the thermal cut-out will
open at 125˚C, causing the oven to shut down. The
defective thermal cut-out must be replaced with a new
one.
THERMAL CUT-OUT 95˚C (MAGNETRON )
The thermal cut-out located on the top of the oven cavity
isdesignedtopreventdamagetothemagnetronifanover
heated condition develops in the tube due to cooling fan
failure,obstructedairguide,dirtyorblockedairintake,etc.
Under normal operation, the thermal cut-out remains
closed.However,whenabnormallyhightemperaturesare
reached within the magnetron, the thermal cut-out will
open at 95˚C, causing the oven to shut down. When the
magnetron has cooled to 75˚, the thermal cut-out closes
and cook cycle will resume.
NOISE FILTER
The noise filter prevents the radio frequency interference
that might flow back in the power circuit.
TURNTABLE MOTOR
The turntable motor drives the roller stay to rotate the
turntable.
FAN MOTOR
Thefanmotordrivesabladewhichdrawsexternalcoolair.
This cool air is directed through the air vants surrounding
the magnetron and cools the magnetron. This air is chan-
nelled through the oven cavity to remove steam and
vapours given off from the heating foods. It is then ex-
hausted through the exhausting air vents at the oven
cavity.
DOOR OPEN MECHANISM
Thedoor is opened bypullingthe door, refer totheFigure
D-1. Latch Heads
Latch Hook
Door
Stop
Switch
Monitor
Switch
1st. Latch
Switch
2nd. Latch
Switch

R-210D
6
SERVICING
WARNING TO SERVICE PERSONNEL
Microwaveovens containcircuitrycapableof producingveryhighvoltageand current,contactwithany partofthe
highvoltagecircuitwillresultinelectrocution.Highvoltagecapacitor,Powertransformer,Magnetron,Highvoltage
rectifier assembly, High voltage harness.
REMEMBER TO CHECK 3D
1) Disconnect the supply.
2) Door opened, and wedged open.
3) Discharge the high voltage capacitor.
WARNING: AGAINST THE CHARGE OF THE
HIGH-VOLTAGE CAPACITOR
Thehigh-voltagecapacitorremainschargedabout
60 seconds after the oven has been switched off.
Wait for 60 seconds and then short-circuit the
connectionofthehigh-voltagecapacitor(thatis,of
the connecting lead of the high-voltage rectifier)
against the chassis with the use of an insulated
screwdriver.
Sharprecommend that whereverpossible fault-finding
is carried out with the supply disconnected. It may, in
some cases, be necessary to connect the supply after
theoutercasehasbeenremoved,inthiseventcarryout
3Dchecksandthendisconnecttheleadstotheprimary
of the power transformer. Ensure that these leads
remain isolated from other components and the oven
chassis. (Use insulation tape if necessary.) When the
testingiscompletedcarryout3Dchecksandreconnect
the leads to the primary of the power transformer.
REMEMBER TO CHECK 4R
1) Reconnect all leads removed from components
during testing.
2) Replace the outer case (cabinet).
3) Reconnect the supply.
4) Run the oven. Check all functions.
Microwave ovens shouldnotbe run empty.Totest for
the presence of microwave energy within a cavity,
place a cup of cold water on the oven turntable, close
the door and set the power level to HIGH. And set the
microwave timer for two (2) minutes. When the two
minutes has elapsed (timer at zero) carefully check
that the water is now hot. If the water remains cold,
carryout3Dchecksandre-examinetheconnectionsto
the component being tested.
When all service work is completed and the oven is fully assembled, the microwave power output should be
checked and microwave leakage test should be carried out.
IMPORTANT: If the oven becomes inoperative because
ofablownfuseM8Ainthe1st.latchswitch
-2nd. latchswitch-monitor switch-moni-
tor resistor circuit, check the 1st. latch
switch, 2nd. latch switch, monitor switch
and monitor resistor before replacing the
fuse M8A.
When troubleshooting the microwave oven, it is helpful to
follow the Sequence of Operation in performing the
checks.Manyofthepossiblecausesoftroublewillrequire
that a specific test be performed. These tests are given a
procedure letter which will be found in the "Test
Procedure"section.
TROUBLESHOOTING GUIDE

R-210D
7
MAGNETRON
POWER TRANSFORMER H.V. RECTIFIER ASSEMBLY HIGH VOLTAGE WIRE HIGH VOLTAGE CAPACITOR 1ST. LATCH SWITCH 2ND. LATCH SWITCH
STOP SWITCH MONITOR SWITCH MONITOR RESISTOR THERMAL CUT-OUT 125˚C (OVEN) THERMAL CUT-OUT 95˚C (MG)
FAN MOTOR TURNTABLE MOTOR FUSE M8A CONTROL PANEL RELAY (RY-1, RY-2) FOIL PATERN ON P.W.B.
POWER SUPPLY CORD SHORTED WIRE HARNESS OPENED WIRE HARNESS OVEN LAMP OR SOCKET WALL OUTLET
MISADJUSTMENT SWITCH HOME FUSE OR BREAKER BLOCKED COOLING FAN BLOCKED VENTILATION NOISE FILTER H.V. FUSE
Homefuse blowswhen power
supplycordispluggedintowall
outlet.
FUSEM8Ablowswhenpower
supplycordispluggedintowall
outlet.
Oven does not start when the
Light Up Dial is set.
Ovenlampdoesnotlight(Other
function is normal.)
Fan motor does not operate.
(Other function is normal.)
Turntable motor does not op-
erate. (Other function is nor-
mal.)
Oven or any electrical parts
does not stop when cooking
timeis0 orSTOP/CLEARpad
is touched.
Oven seems to be operating
butlittleornoheatisproduced
in oven load. (Microwave
power level is set at HIGH)
Oven does not seems to be
operating properly when ME-
DIUM HIGH, MEDIUM, ME-
DIUM LOW or LOW is set.
(Oven operates properly at
HIGH.)
Oven goes into cook cycle but
shutsdownbeforeendofcook-
ing cycle.
Oven lamp, turntable motor
and fan motor do not operate.
OFF
CONDITION
PROBLEM
CONDITION
POSSIBLE CAUSE
AND
DEFECTIVE PARTS
TEST PROCEDURE
ON
CONDITION
CK = Check / RE = Replace
ABC CK D EEEE FGGHH ILNORECKCKRE CKCKCK CKCK JK

R-210D
8
CARRY OUT 3D CHECKS.
Isolate the magnetron from the high voltage circuit by removing all leads connected to the filament
terminal.
Totestforanopencircuitfilamentuseanohmmetertomakeacontinuitytestbetweenthemagnetron
filament terminals, the meter should show a reading of less than 1 ohm.
Totest for a short circuit filament to anode condition, connect ohmmeter between one ofthefilament
terminalsandthecaseofthemagnetron(ground).Thistestshouldbeindicatedaninfiniteresistance.
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 microwave oven in a fully assembled
condition (outer case fitted). Microwave output power from the magnetron can be measured by IEC
testprocedure,i.e.itcanbemeasuredbyusingwaterloadhowmuchitcanbeabsorbedbythewater
load.Tomeasurethemicrowaveoutputpowerinthemicrowaveoven,therelationofcalorieandwatt
is used. When P(W) heating works for t(second), approximately P x t/4.187 calorie is generated. On
theother hand, if the temperature of thewaterwithV(ml)rises∆T (˚C) duringthismicrowaveheating
period, the calorie of the water is V x ∆T.
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±2)˚C.
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. Selectstirringdevicesandmeasuringinstrumentsinordertominimizeadditionorremovalofheat.
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”ismeasuredwhilethemicrowavegeneratorisoperatingatfullpower.Magnetronfilamentheat-
up 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 T1 = 11˚C)
2. Add the 1 litre water to the vessel.
3. Place the load on the centre of the shelf.
4. Operate the microwave oven at HIGH for the temperature of the water rises by a value ∆T of
(10 ±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.
AMAGNETRON TEST
NEVERTOUCHANYPARTINTHECIRCUITWITHYOURHANDORANINSULATEDTOOL
WHILE THE OVEN IS IN OPERATION.
The formula is as follows;
P x t / 4.187 = V x ∆T+ 0.55 x mc (T2-T0) P (W) = 4.187 x V x ∆T / t + 0.55 x mc (T2-T0)/t
Our condition for water load is as follows:
Room temperature (T0) ... around 20°C Power supply Voltage.............. Rated voltage
Water load..................................1000 g Initial temperature (T1) ...................... 10±1°C
Heating time.............................. 52 sec. Mass of container (mc) ......................... 330 g
T2............................ Final Temperature P = 80 x ∆T + 0.55 x mc (T2-T0)/52
TEST PROCEDURES
PROCEDURE
LETTER COMPONENT TEST

R-210D
9
1000g
1000g
1000g
T1˚C T2˚C
Heat up for 54 sec.
BPOWER TRANSFORMER TEST
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:
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 of the high-
voltage circuits, including the magnetron filament.
If the reading obtained are not stated as above, then the power transformer is probably faulty and
should be replaced.
CARRY OUT 4R CHECKS.
Room temperature ....................... To = 21˚C Initial temperature .................... T1 = 11°C
Temperature after (52 + 2) = 54 sec. ..................................................................... T2 = 21°C
Temperature difference Cold-Warm ................................................................... ∆T1 = 10°C
Measured output power
The equation is “P = 80 x ∆T” ...................................................... P = 80 x 10°C = 800 Watts
JUDGMENT: The measured output power should be at least ±15 % of the rated output power.
CAUTION: 1°C CORRESPONDS TO 80 WATTS. REPEAT MEASUREMENT IF THE POWER IS
INSUFFICIENT.
a.Primary winding ............... 1.8 ohms approximately
b.Secondary winding........... 132 ohms approximately
c.Filament winding .............. less than 1 ohm
CHIGH VOLTAGE RECTIFIER ASSEMBLY TEST
HIGH VOLTAGE RECTIFIER TEST
CARRY OUT 3D CHECKS.
IsolatethehighvoltagerectifierassemblyfromtheHVcircuit.Thehighvoltagerectifier canbetested
using an ohmmeter set to its highest range. 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.Thenormalresistanceisinfiniteinonedirectionandmorethan100kΩintheotherdirection.
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, BE-
CAUSE OTHERWISE AN INFINITE RESISTANCE MIGHT BE SHOWN IN BOTH DIREC-
TIONS.
TEST PROCEDURES
PROCEDURE
LETTER COMPONENT TEST
BC
HIGH VOLTAGE RECTIFIER

R-210D
10
TEST PROCEDURES
PROCEDURE
LETTER COMPONENT TEST
DHIGH 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
resistance range.
C. A normal capacitor shows continuity for a short time (kick) and then a resistance of about 10MΩ
after it has been charged.
D. A short-circuited capacitor shows continuity all the time.
E. An open capacitor constantly shows a resistance about 10 MΩbecause of its internal 10MΩ
resistance.
F. When the internal wire is opened in the high voltage capacitor shows an infinite resistance.
G. The resistance across all the terminals and the chassis must be infinite when the capacitor is
normal.
If incorrect reading are obtained, the high voltage capacitor must be replaced.
CARRY OUT 4R CHECKS.
ESWITCH TEST
Isolate the switch to be tested and using an ohmmeter check between the terminals as described in
the following table.
CARRY OUT 3D CHECKS.
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 close terminal
S.C.; Short circuit
O.C.; Open circuit
If incorrect readings are obtained, make the necessary switch adjustment or replace the switch.
CARRY OUT 4R CHECKS.
F MONITOR RESISTOR TEST
CARRY OUT 3D CHECKS.
Disconnect the leads from the monitor resistor. Using an ohmmeter and set on a low range. Check
between the terminals of the monitor resistor.
The resistance of monitor resistor is approx. 0.8 ohms.
If incorrect readings are obtained, replace the monitor resistor.
CARRY OUT 4R CHECKS.
GTHERMAL CUT-OUT TEST
CARRY OUT 3D CHECKS.
Disconnect the leads from the terminals of the thermal cut-out. Then using an ohmmeter, make a
continuity test across the two terminals as described in the below.
CARRY OUT 4R CHECKS. Table: Thermal Cut-out Test
Temperature of "ON" condition Temperature of "OFF" condition Indicationofohmmeter(Whenroom
Parts Name (closed circuit). (open circuit). temperature is approx. 20˚C.)
Thermal cut-out 125˚C This is not resetable type. Above 125˚C Closed circuit
Thermal cut-out 95˚C Below 75˚C Above 95˚C Closed circuit.
If incorrect readings are obtained, replace the thermal cut-out.
An open circuit thermal cut-out (MG) indicates that the magnetron has overheated, this may be due

R-210D
11
TEST PROCEDURES
PROCEDURE
LETTER COMPONENT TEST
to resistricted ventilation, cooling fan failure or a fault condition within the magnetron or HV circuit.
Anopencircuittemperaturefuse(OVEN)indicatesthatthefoodintheovencavitymaycatchfire,this
may be due to overheating produced by improper setting of the cooking time or failure of the control
panel.
HMOTOR WINDING TEST
CARRY OUT 3D CHECKS.
Disconnect the leads from the motor. Using an ohmmeter, check the resistance between the two
terminals as described in the table below.
IFUSE M8A
CARRY OUT 3D CHECKS.
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.
If the fuse M8A is blown, there is a shorts or grounds in electrical parts or wire harness.
Check them and replace the defective parts or repair the wire harness.
CARRY OUT 4R CHECKS.
CAUTION: Only replace fuse with the correct value replacement.
Table: Resistance of Motor
Motors Resistance
Fan motor Approximately 390 ohms
Turntable motor Approximately 12 kohms
If incorrect readings are obtained, replace the motor.
CARRY OUT 4R CHECKS.
JNOISE FILTER TEST
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.
If incorrect readings are obtained, replace the noise filter unit.
CARRY OUT 4R CHECKS.
MEASURING POINT INDICATION OF OHMMETER
Between N and L Open circuit
Between terminal N and WHITE Short circuit
Between terminal L and RED Short circuit
K HIGH VOLTAGE FUSE TEST
CARRY OUT 3D CHECKS.
If the high voltage fuse is blown, there could be a short in the high voltage rectifier or the magnetron.
Check them and replace the defective parts and the high voltage fuse.
CARRY OUT 4R CHECKS.
CAUTION: ONLY REPLACE HIGH VOLTAGE FUSE WITH THE CORRECT VALUE REPLACE-
MENT.
FUSE
M8A
NL
LINE CROSS CAPACITOR
0.068µ/AC250V
NOISE SUPPRESSION COIL
LINE BYPASS
CAPACITOR
0.0022µ/AC250V
LINE BYPASS
CAPACITOR
0.0022µ/AC250V
NOISE FILTER
WHT RED

R-210D
12
TEST PROCEDURES
PROCEDURE
LETTER COMPONENT TEST
LCONTROL PANEL ASSEMBLY TEST
The control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore,
unlike conventional microwave ovens, proper maintenance can not be performed with only a
voltmeter and ohmmeter.
In this service manual, troubleshooting by replacement is described according to the symptoms
indicated.
1. Control Panel
The following symptoms indicate a defective control unit.
1-1 In connection with LEDs
a) At a certain LED, all or some LEDs do not light up.
b) At a certain LED, brightness is low.
c) Only one LED does not light up.
d) All or some LEDs continue to light up.
e) A certain group of LEDs do not light up.
f) The LEDs flicker.
1-2 Tact switch
a) When touching a tact switch, a tact switch produces no signal.
1-3 Other possible troubles caused by defective control unit.
a) Buzzer does not sound or continues to sound.
b) Cooking is not possible.
c) Cooking time can not be set.
d) Power level can not be set.
M TACT SWITCH TEST
1. CARRY OUT 3D CHECKS.
2. Remove the control unit from the control panel.
3. By using an ohmmeter, check the tact switch operation.
4. When the tact switch is not depressed, an ohmmeter should indicate an open circuit. When the
tact switch is depressed, an ohmmeter should indicate a short circuit. If improper operation is
indicated, the tact switch is probably defective and should be checked.
5. CARRY OUT 4R CHECKS after test.
CARRY OUT 3D CHECKS.
Remove the outer case and check voltage between Pin Nos. 3 and 5 of the 3 pin connector (A) on
the control unit with an A.C. voltmeter.
The meter should indicate 230-240 volts, if not check oven circuit.
Relay Test
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.
DC. voltage indicated.......... Defective relay.
DC. voltage not indicated .... Check diode which is connected to the relay coil. If diode is good,
control unit is defective.
RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS
RY1 Approx. -11.4V D.C. Oven lamp / Turntable motor / Fan motor
RY2 Approx. -11.0V D.C. High voltage transformer
CARRY OUT 4R CHECKS.
NRELAY TEST

R-210D
13
TEST PROCEDURES
PROCEDURE
LETTER COMPONENT TEST
O PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING
BOARD(PWB) IS OPEN
Toprotecttheelectroniccircuits,thismodelisprovidedwithafinefoilpatternaddedtotheinputcircuit
onthe PWB,thisfoilpattern actsasafuse.If thefoilpatternis open,followthetroubleshootingguide
given below for repair.
Problem: POWER ON, indicator does not light up.
CARRY OUT 3D CHECKS.
STEPS OCCURRENCE CAUSE OR CORRECTION
1 The rated AC voltage is not present at Check supply voltage and oven power cord.
Power terminal of CPU connector (CN-A).
2 The rated AC voltage is present at primary Low voltage transformer or secondary circuit defective.
side of low voltage transformer. Check and repair.
3 Only pattern at "a" is broken. *Insert jumper wire J1 and solder.
(CARRY OUT 3D CHECKS BEFORE REPAIR)
4 Pattern at "a" and "b" are broken. *Insert the coil RCILF2003YAZZ between "c" and "d".
(CARRY OUT 3D CHECKS BEFORE REPAIR)
NOTE: *At the time of these repairs, make a
visual inspection of the varistor for
burning damage and examine the
transformer with tester for the pres-
ence of layer short circuit (check pri-
mary coil resistance).
If any abnormal condition is detected,
replace the defective parts.
CARRY OUT 4R CHECKS. (J1) CN - A
ab
c
d
15
1
P
T1
VRS1
RY1

R-210D
14
CONTROL PANEL ASSEMBLY
OUTLINE OF CONTROL PANEL
5) Buzzer Circuit
ThebuzzerisresponsivetosignalsfromtheLSItoemit
audible sounds (tact switch touch sound and comple-
tion sound).
6) Door Sensing Switch (Stop Switch)
A switch to "tell" the LSI if the door is open or closed.
7) Relay Circuit
Todrivethemagnetron,fanmotor,turntablemotorand
light the oven lamp.
8) Encoder
Theencodergeneratesthepulsesignal,andthepulse
signal is sent to the LSI.
9) Indicator Circuit
IndicatorelementsaretheLight-emittingdiodes(LD1-
LD24 and LD30-LD34).
This circuit consists of 4-digits and 8 segments.
10) Tact Switch
Signal generated in the LSI is sent to the tact switch.
When a tact switch is touched, a signal is completed
through the tact switch and passed back to the LSI
through to perform the function that was requested.
Control Unit
ControlunitconsistsofLSI,powersourcecircuit,synchro-
nizing signal circuit, ACL circuit, buzzer circuit, encoder
circuit and indicator circuit.
1) LSI
ThisLSIcontrolstheencodersignal,tactswitchstrobe
signal, relay driving signal for oven function, buzzer
signal and LED signal.
2) Power Source Circuit
This circuit generates voltage necessary in the control
unit.
Symbol Voltage Application
VC -5.0V LSI(IC-1)
VR -12.0V RELAY(RY1,2)
3) Synchronizing Signal Circuit
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.
4) ACL
A circuit to generate a signals which resets the LSI to
the initial state when power is supplied.

R-210D
15
DESCRIPTION OF LSI
LSI(IXA023DR)
The I/O signal of the LSI(IXA023DR) are detailed in the following table.
Pin No. Signal I/O Description
1 D3 OUT Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD8, LD16 and LD24).
2 D4 OUT Signal to sound buzzer.
A: Tact switch touch sound.
B: Completion sound.
3 D5 OUT Oven lamp, turntable motor and fan motor driving signal(Square Waveform
: 50Hz).
To turn on and off shut-off relay
(RY1). The square waveform volt-
age is delivered to the relay (RY1)
driving circuit and relay(RY2) con-
trol circuit.
4 D6 OUT Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2). In
100% power operation, the signals hold
"L" level during microwave cooking and
"H" level while not cooking. In other cook-
ing modes (70%, 50%, 30%, 10%) the
signal turns to "H" level and "L" level in
repetition according to the power level.
5 D7 IN/OUT Terminal not used.
6 P20 IN Connected to 0V.
7 P21 IN Signal coming from touch tact switch.
Whentact switchSW2istouched,a signal willbeinputinto P21. Whentactswitch
is not touched, the signal is held at "H" level.
8 P22 IN Signal coming from encoder.
When the encoder is turned, the contacts of encoder make pulse signals. And
pulse signals are input into P22.
9RESET IN Auto clear terminal.
SignalisinputtoresettheLSItotheinitialstatewhenpowerisapplied.Temporarily
setto"L"levelthemomentpowerisapplied,atthistimetheLSIisreset.Thereafter
set at "H" level.
10 CNVSS IN Reference voltage input terminal.
A reference voltage is applied to the A/D converter in the LSI. Connected to VC.
11 XOUT OUT Internal clock oscillation frequency control output.
Output to control oscillation input of XOUT.
12 XIN IN Internal clock oscillation frequency input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit
with respect to XIN terminal.
13 VSS IN Power source voltage: -5V.
The power source voltage to drive the LSI is input to VSS terminal. Connected to
VC.
14 VDD IN Power source voltage: 0V.
The power source voltage to drive the LSI is input to VDD terminal.
15 N.F IN Connected to VSS terminal.
16 INT0 IN Signal coming from encoder.
Signal similar to INT0. Pulse signals are input into INT0.
A
BH: GND
L: -5V
0.12 sec
2.4 sec
20 msec
During cooking
H
L
ON/OFF time ratio in Mi-
cro cooking
(a. 27second time base)
MICRO ON OFF
COOK
100% 27sec. 0sec.
70% 21sec. 6sec.
50% 15sec. 12sec.
30% 9sec. 18sec.
10% 5sec. 22sec.

R-210D
16
Pin No. Signal I/O Description
17 INT1 IN Signal to synchronize LSI with commercial power source frequency.
Thisisbasictimingforallrealtimeprocess-
ing of LSI.
18-19 AIN0-AIN1 IN Terminal to change functions according to the model.
Signal in accordance with the model in operation is applied to set up its function.
20 AIN2 IN Input signal which communicates the door open/close information to LSI.
Door closed; "H" level signal.
Door opened; "L" level signal.
21 AIN3 IN Terminal to change functions according to the model.
Signal in accordance with the model in operation is applied to set up its function.
22 P00 OUT Digit selection signal.
Signal is input to the anodes of the light-emitting diodes (LD30 - LD34).
23 P01 OUT Digit selection signal.
Signal is input to the anodes of the light-emitting diodes (LD9 - LD16).
24 P02 OUT Digit selection signal.
Signal is input to the anodes of the light-emitting diodes (LD17 - LD24).
25 P03 OUT Digit selection signal.
Signal is input to the anodes of the light-emitting diodes (LD1 - LD8).
26 P10 OUT Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD1, LD9, LD17 and
LD30).
27 P11 OUT Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD2, LD10, LD18 and
LD31).
28 P12 OUT Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD3, LD11, LD19 and
LD32).
29 P13 OUT Segment data signal.
Signalisinput to the cathodes ofthelight-emittingdiodes (LD4, LD12 and LD20).
30 D0 OUT Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD5, LD13, LD21 and
LD33).
31 D1 OUT Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD6, LD14, LD22 and
LD34).
32 D2 OUT Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD7, LD15 and LD23).
20 msec
H : GND
L (-5V)

R-210D
17
1. Precautions for Handling Electronic Components
This unit uses CMOS LSI in the integral part of the
circuits. When handling these parts, the following pre-
cautions should be strictly followed. CMOS LSI have
extremely high impedance at its input and output
terminals.For this reason,itis easily influencedbythe
surroundinghighvoltagepowersource, staticelectric-
ity 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 aluminium foil. Also wrap PW boards con-
taining them in aluminium foil.
2) Whensoldering,groundthetechnicianasshownin
the figure and use grounded soldering iron and
work table.
approx. 1M ohm
2. Shapes of Electronic Components
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
panelisavailableeitherfromthepowerlineoftheoven
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 trans-
former, or unplug the primary terminal (connector)
ofthehighvoltagetransformertoturn it off; the end
ofsuchconnectormustbeinsulatedwithaninsulat-
ing tape. After servicing, be sure to replace the
leads to their original locations.
A. On some models, the power supply cord be-
tweenthetouchcontrolpanelandtheovenitself
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.
SERVICING
B. On some models, the power supply cord be-
tween the touch control panel and the oven
proper is so long enough that they may be
separated from each other. For those models,
therefore, it is possible to check and repair the
controlsofthetouchcontrolpanelwhilekeeping
it apart from the oven proper; in this case you
mustshortbothendsofthedoorsensingswitch
(on PWB) of the touch control panel with a
jumper,whichbringsaboutanoperationalstate
thatis equivalent to the oven door being closed.
As for the sensor-related controls of the touch
control panel, checking them is possible if the
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:
Disconnectthetouchcontrolpanelcompletelyfrom
the oven proper, and short both ends of the door
sensingswitch(onPWB)ofthetouchcontrolpanel,
which brings about an operational state that is
equivalent to the oven door being closed. Connect
an external power source to the power input termi-
nal of the touch control panel, then it is possible to
check and repair the controls of the touch control
panel;itisalsopossibletocheckthesensor-related
controls of the touch control panel by using the
dummy resistor(s).
4. Servicing Tools
Tools required to service the touch control panel as-
sembly.
1) Soldering iron: 30W
(It is recommended to use a soldering iron with a
grounding terminal.)
2) Oscilloscope: Single beam, frequency range: DC -
10MHz type or more advanced model.
3) Others: Hand tools
5. Other Precautions
1) Before turning on the power source of the control
unit,remove the aluminiumfoil applied for prevent-
ing static electricity.
2) Connecttheconnector of the keyunitto the control
unit being sure that the lead wires are not twisted.
3) After aluminium 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
precision is required.
ECB
ECB
Transistor
2SB1238
Transistor
DTA123ES
DTA143ES
DTB123ES
DTD143ES

R-210D
18
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
WARNING: Avoid possible exposure to microwave energy. Please follow the instructions
below before operating the oven.
1. Disconnect oven from power supply.
2. Visually check the door and cavity face plate for dam-
age (dents, cracks, signs of arcing etc.).
Carry out any remedial work that is necessary before
operating the oven.
Do not operate the oven if any of the following conditions
exist;
1. Door does not close firmly.
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. Therearedefective partsinthemicrowavegenerating
and transmission assembly.
7. There is visible damage to the oven.
Do not operate the oven:
1. Without the RF gasket (Magnetron).
2. If the wave guide or oven cavity are not intact.
3. If the door is not closed.
4. If the outer case (cabinet) is not fitted.
Please refer to ‘OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS’, when carrying out any
of the following removal procedures:
WARNING FOR WIRING
To prevent an electric shock, take the following
manners.
1. Before wiring,
1) Disconnect the power supply.
2) Open the door and wedge the door open.
3) Discharge the high voltage capacitor and wait for
60 seconds.
2. Don't let the wire leads touch to the following parts;
1) High voltage parts:
Magnetron, High voltage transformer, High volt-
age capacitor and High voltage rectifier assem-
bly.
2) Hot parts:
Ovenlamp, Magnetron,Highvoltagetransformer
and Oven cavity.
3) Sharp edge:
Bottom plate, Oven cavity, Waveguide flange,
Chassis support and other metallic plate.
4) Movable parts (to prevent a fault)
Fanblade,Fanmotor,Switch,Switchlever,Open
button.
3. Donotcatchthewireleadsintheoutercasecabinet.
4. Insertthepositivelockconnectorcertainlyuntilitspin
is locked. And make sure that the wire leads should
not come off even if the wire leads is pulled.
5. To prevent an error function, connect the wire leads
correctly, referring to the Pictorial Diagram.
To remove the outer case proceed as follows.
1. Disconnect the oven from power supply.
2. Open the oven door and wedge it open.
3. Remove the eight (8) screws from rear and along the
side edge of case.
4. Slide the entire case back about 3cm to free it from
retaining clips on the cavity face plate.
5. Lift the entire case from the oven.
6. Discharge the H.V. capacitor before carrying out any
further work.
7. Do not operate the oven with the outer case removed.
N.B.; Step 1, 2 and 6 form the basis of the 3D checks.
CAUTION: DISCHARGEHIGHVOLTAGECAPACITOR
BEFORETOUCHINGANYOVENCOMPO-
NENT OR WIRING.
OUTER CASE REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnectthewireleads(mainwireharnessandH.V.
fuse) from power transformer.
3. Disconnectthefilamentleadofpowertransformerfrom
the magnetron.
4. Disconnect the filament lead of the power transformer
from high voltage capacitor.
5. Remove the two (2) screws holding the transformer to
bottom plate from below.
6. Remove the two (2) screws holding the transformer to
bottom plate from above.
7. Remove the transformer.
POWER TRANSFORMER REMOVAL