Page 1
R-350F
35
SHARP CORPORATION
SERVICE MANU AL
S7207R350FPJ/
MICROWAVE OVEN
MODEL
R-350F
In interests of user-safety the oven should be restored to its
original condition and only parts identical to those specified
should be used.
TABLE OF CONTENTS
Page
CAUTION, MICROWAVE RADIATION............................................................................................................. 1
WARNING..........................................................................................................................................................1
PRODUCT SPECIFICATIONS ......................................................................................................................... 2
GENERAL INFORMATION................................................................................................................................2
APPEARANCE VIEW ....................................................................................................................................... 3
OPERATION SEQUENCE................................................................................................................................ 4
FUNCTION OF IMPORTANT COMPONENTS ................................................................................................ 5
SERVICING AND TROUBLESHOOTING GUIDE ............................................................................................ 6
TEST PROCEDURE......................................................................................................................................... 8
TOUCH CONTROL PANEL.............................................................................................................................14
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE........................................................... 18
MICROWAVE MEASUREMENT .................................................................................................................... 24
WIRING DIAGRAM......................................................................................................................................... 25
PICTORIAL DIAGRAM ................................................................................................................................... 26
POWER UNIT CIRCUIT ..................................................................................................................................27
CPU UNIT CIRCUIT ........................................................................................................................................28
PRINTED WIRING BOARD .............................................................................................................................29
PARTS LIST ................................................................................................................................................... 30
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R-350F
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Page 3
R-350F
1
SERVICE MANUAL
MICROWAVE OVEN
R-350F
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 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.
Service engineers should not be exposed to the microwave
energy which may radiate from the magnetron or other
microwave generating devices if it is improperly used or
connected. All input and output microwave connections,
waveguides, flanges and gaskets must be secured. Never
operate the device 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.
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.
All the parts marked "∆" on parts list may cause undue microwave exposure, by themselves, or when they are damaged,
loosened or removed.
SHARP CORPORATION
OSAKA, JAPAN
PRODUCT SPECIFICATIONS
APPEARANCE VIEW
OPERATING SEQUENCE
FUNCTION OF IMPORTANT
COMPONENTS
SERVICING AND
TROUBLESHOOTING CHART
TEST PROCEDURE
TOUCH CONTROL PANEL
ASSEMBLY
COMPONENT REPLACEMENT
AND ADJUSTMENT PROCEDURE
MICROWAVE MEASUREMENT
WIRING DIAGRAM
PARTS LIST
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ITEM DESCRIPTION
Power Requirements 230 - 240 Volts
50 Hertz
Single phase, 3 wire earthed
Power Consumption 1.75kW
Power Output 1200 watts nominal of RF microwave energy (IEC Test Procedure)
Operating frequency 2450 MHz
Case Dimensions Width 520 mm
Height 302 mm including foot
Depth 436 mm
Cooking Cavity Dimensions Width 374 mm
Height 227 mm
Depth 399 mm
Turntable diameter 335 mm
Control Complement Touch Control System
Clock ( 1:00 - 12:59)
Timer (0 - 99 minutes 99 seconds)
Microwave Power for Variable Cooking
Repetition Rate;
HIGH ...............................................Full power throughout the cooking time
M . HIGH ............................................................approx. 70% of Full Power
MEDIUM .............................................................approx. 50% of Full Power
M . LOW..............................................................approx. 30% of Full Power
LOW....................................................................approx. 10% of Full Power
EXPRESS MENUS PADS, INFORMATION COOK PADS
CONVENIENCE MEALS PADS, REHEAT MENU PADS,
HELP PAD, MORE( ), LESS ( ) PADS
NUMBER PADS, POWER LEVEL PAD
CLOCK PAD, TIMER PAD, STOP/CLEAR PAD
INSTANT COOK/START PAD
Set Weight Approx. 17 kg
PRODUCT SPECIFICATIONS
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
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R-350F
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APPEARANCE VIEW
1. Door handle
2. Oven lamp
3. Door hinges
4. Door safety latches
5. See through door
6. Door seals and sealing surfaces
7. Coupling
8. Wave guide cover
9. Touch control panel
10.Digital readout
11.Ventilation openings
12.Power supply cord
13.Turntable tray
14.Turntable support
15.Menu label
TOUCH CONTROL PANEL
NOTE:
Some one-touch cooking features such as "INSTANT COOK" are disabled after three minutes when
the oven is not in use. These features are automatically enabled when the door is opened and closed
or the STOP/ CLEAR pad is pressed.
9
10
465
3
1
2
8
7
15
4
14
12
13
11
Indicator
Display
EXPRESS MENUS PADS
Press to select "Express Me-nus"
menus.
REHEAT MENU PADS
Press to select a reheat menu.
HELP PAD
Press to select auto start, child
lock or demonstrationmode.Press
to display preset menu cooking
information.
CLOCK PAD
Press to set Clock
I
NSTANT COOK/START PAD
Press to start oven after set-ting
programmes.Press once to cook for
1 min-ute on HIGH or increase in 1
minute increments each time this
pad is pressed during cooking.
POWER LEVEL PAD
Press to select microwave power
setting.If not pressed, HIGH is automatically selected.
INFORMATION COOK PADS
Press to select Information Cook mode.
NUMBER PADS
Press to enter cooking times, clock
time, weight or quantity of food.
MORE( ), LESS ( ) PADS
Press to increase/decrease the time
in one minute incre-ments during
cooking or to alter the cooking result
for automatic operations.
TIMER PAD
Press to set Timer.
S
STOP/CLEAR PAD
Press to clear during pro-gramming.
Press once to stop operation of oven
during cooking;press twice to cancel
cook-ing programme.
CONVENIENCE MEALS PADS
Press to select Convenience Meals menus.
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OPERATION SEQUENCE
OFF CONDITION
Closing the door activates all door interlock switches
(1st. latch switch and 2nd. interlock relay control 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 noise filter and the control unit.
Figure O-1 on page 25
1. The display shows "SHARP , MICRO-WAVE and
OVEN".
2. To set any programmes or set the clock, you must
first touch the STOP/CLEAR pad.
3. : appears in the display.
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
pad and start the oven with touching START pad.
Function sequence
Figure O-2 on page 25
CONNECTED COMPONENTS RELAY
Oven lamp, Fan motor, Turntable motor RY1
Power transformer RY2
1. 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.
2. 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..
3. The 2450 MHz microwave energy produced in the
magnetron generates a wave length of 12.24 cm. This
energy is channelled through the waveguide (transport
channel) into the oven cavity, where the food is placed
to be cooked.
4. When the cooking time is up, a signal tone is heard and
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
(NO COOKING)
1st. latch switch COM-NO Closed Open
2nd. interlock relay
control switch
COM-NO Closed Open
Monitor switch COM-NC Open Closed
The circuits to the power transformer, fan motor and
turntable motor are cut off when the 1st. latch switch
and 2nd. interlock relay control 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 RY1 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 1st. latch
switch and 2nd. interlock relay.
6-1 When the oven door is opened during or after the
cycle of a cooking program, the 1st. latch switch and
2nd. interlock relay control switch must open their
contacts first.
After that the contacts (COM-NC) of the monitor
switch can be closed.
6-2. When the oven door is closed, the contacts (COM-
NC) of the monitor switch must be opened. After that
the contacts of the 1st. latch switch and 2nd. interlock
relay control switch are closed.
6-3. When the oven door is opened and the contacts of the
1st. latch switch and 2nd. interlock relay remain
closed. The fuse F10A 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 32-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 correspond
to the percentage of microwave power, because
approx. 3 seconds are needed for heating up the
magnetron filament.
POWER OUTPUT REDUCTION
After 100% power cooking mode is carried out for more
than 40 minutes, the power out-put is automatically reduced to 70%.
32 sec. ON
24 sec. ON
18 sec. ON
12 sec. ON
6 sec. ON
8 sec. OFF
14 sec. OFF
20 sec. OFF
26 sec. OFF
HIGH
MEDIUM HIGH
MEDIUM
MEDIUM LOW
LOW
Approx. 70%
Approx. 50%
Approx. 30%
Approx. 10%
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FUNCTION OF IMPORTANT COMPONENTS
closed. However, when abnormally high temperatures are
reached within the oven cavity, the oven thermal cut-out
will open at 125˚C, causing the oven to shut down. The
defective thermal cut-out must be replaced with new one.
MAGNETRON THERMAL CUT-OUT
The thermal cut-out located near the magnetron is designed to prevent damage to the magnetron if an over
heated condition develops in the tube due to cooling fan
failure, obstructed air guide, dirty or blocked air intake, etc.
Under normal operation, the thermal cut-out remains
closed. However, when abnormally high temperatures are
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˚C, the thermal cut-out closes
and cook cycle will resume.
TURNTABLE MOTOR
The turntable motor drives the turntable roller assembly to
rotate the turntable.
FAN MOTOR
The fan motor drives a blade which draws external cool air.
This cool air is directed through the air vents surrounding
the magnetron and cools the magnetron. This air is channelled through the oven cavity to remove steam and
vapours given off from the heating foods. It is then exhausted through the exhausting air vents at the oven
cavity.
NOISE FILTER
The noise filter prevents the radio frequency interference
that might flow back in the power circuit.
DOOR OPEN MECHANISM
The door is opened by pulling the door, refer to the Figure
D-1.
Figure D-1. Door Open Mechanism
1ST. LATCH SWITCH AND 2ND. INTERLOCK
RELAY CONTROL SWITCH
1. When the oven door is closed, the contacts (COM-NO)
must be closed.
2. When the oven door is opened, the contacts (COMNO) 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 1st. latch switch and 2nd. interlock relay fail to
open, the fuse F10A blows simultaneously with closing
the contacts (COM-NC) of the monitor switch.
CAUTION: BEFORE REPLACING A BLOWN FUSE F10A
TEST THE 1ST. LATCH SWITCH, 2ND.
INTERLOCK RELAY AND MONITOR
SWITCH FOR PROPER OPERATION.
HIGH VOLTAGE FUSE
The high voltage fuse blows when the high voltage rectifier
or magnetron is shorted.
FUSE F10A
1. The fuse F10A blows when the contacts (COM-NO) of
the 1st. latch switch and 2nd. interlock relay remain
closed with the oven door open and when the monitor
switch closes.
2. If the wire harness or electrical components are shortcircuited, this fuse F10A blows to prevent an electric
shock or fire hazard.
OVEN THERMAL CUT-OUT
The thermal cut-out, located on the top of the oven cavity,
is designed to prevent damage to the oven by fire. If the
foods load is overcooked, by either error in cook time or
defect in the control unit, the thermal cut-out will open.
Under normal operation, the oven thermal cut-out remains
Latch Hook
2nd. Interlock
Reley Control
Switch
Latch
Heads
Door
Monitor Switch
1st. Latch
Switch
Page 8
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SERVICING
WARNING TO SERVICE PERSONNEL
Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts
of the high voltage circuit will result in electrocution. High voltage capacitor, Power transformer, Magnetron, High
voltage rectifier assembly, High voltage fuse, 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
The high-voltage capacitor remains charged about
60 seconds after the oven has been switched off.
Wait for 60 seconds and then short-circuit the
connection of the high-voltage capacitor (that is, of
the connecting lead of the high-voltage rectifier)
against the chassis with the use of an insulated
screwdriver.
Sharp recommend that wherever possible fault-finding
is carried out with the supply disconnected. It may in,
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
primary 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.
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 should not be run empty. To test 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 microwave timer for two (2)
minutes. Set the power level to HIGH and push the
START button. When the two minutes has elapsed
(timer at zero) carefully check that the water is now hot.
If the water remains cold carry out
3D checks and reexamine the connections to the component being
tested.
When troubleshooting the microwave oven, it is helpful to
follow the Sequence of Operation in performing the
checks. Many of the possible causes of trouble will require
that a specific test be performed. These tests are given a
procedure letter which will be found in the "Test Procedure" section.
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.
TROUBLESHOOTING GUIDE
IMPORTANT: If the oven becomes inoperative because
of a blown fuse F10A in the 1st. latch
switch - 2nd. interlock relay - monitor switch
circuit check the 1st. latch switch, 2nd.
interlock relay and monitor switch before
replacing the fuse F10A.
Page 9
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CK = Check / RE = Replace
MAGNETRON
POWER TRANSFORMER
H.V. RECTIFIER ASSEMBLY
HIGH VOLTAGE CAPACITOR
1ST. LATCH SWITCH
2ND. INTERLOCK RELAY CONTROL
SWITCH
MONITOR SWITCH
THERMAL CUT-OUT 95˚C /125˚C
FAN MOTOR
TURNTABLE MOTOR
FUSE F10A
TOUCH CONTROL PANEL
KEY UNIT
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
HIGH VOLTAGE FUSE
Home fuse blows when power
supply cord is plugged into
wall outlet.
FUSE F10A blows when
power supply cord is plugged
into wall outlet.
Display does not show anything when power supply cord
is plugged into wall outlet.
Display does not operate
properly 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 or no heat is produced in oven load. (Microwave power level is set at
HIGH)
Oven does not seems to be
operating properly when MEDIUM HIGH, MEDIUM, MEDIUM LOW or LOW is set.
(Oven operates properly at
HIGH and then the STOP/
CLEAR pad is touched the
oven stops.)
Oven goes into cook cycle but
shuts down before end of
cooking cycle.
TEST PROCEDURE
ABCDEEEFGG HKLMN
RECK CK RE CK CKCK CK CK
IJ
CONDITION
PROBLEM
POSSIBLE CAUSE
AND
DEFECTIVE PARTS
ON
CONDITION
OFF
CONDITION
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NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL
WHILE THE OVEN IS IN OPERATION.
CARRY OUT 3D CHECK.
Isolate the magnetron from high voltage circuit by removing all leads connected to 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 short 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 microwave oven in a fully assembled
condition (outer case fitted). Microwave output power from the magnetron can be measured by IEC
test procedure, 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/4.187 calorie is generated. On
the other hand, if the temperature of the water with V(ml) rises ∆T (˚C) during this microwave heating
period, the calorie of the water is V x ∆T.
The formula is as follows;
P x t / 4.187 = V x ∆ T+ 0.55 x mc (T2-T0)/4.187P (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°CPower supply Voltage.............. Rated voltage
Water load..................................1000 g Initial temperature (T1) ...................... 10±1°C
Heating time.............................. 35 sec. Mass of container (mc) ......................... 330 g
T2............................ Final Temperature P = 120 x ∆T + 0.55 x mc (T2-T0)/35
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±1)˚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. 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 + 3” sec. 3 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 ˚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.
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
A MAGNETRON TEST
Page 11
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Room temperature .................. To = 21˚C Initial temperature................. T1 = 11°C
Temperature after (35 + 3) = 38 sec. ................................................................ T2 = 21°C
Temperature difference Cold-Warm .............................................................. ∆T1 = 10°C
Measured output power
The equation is “P = 120 x ∆T” ........................................... P = 120 x 10°C = 1200 Watts
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
JUDGEMENT: The measured output power should be at least ± 15 % of the rated output power.
CAUTION: 1°C CORRESPONDS TO 120 WATTS REPEAT MEASUREMENT IF THE POWER IS
INSUFFICIENT.
1000g
1000g
1000g
T1˚C
T2˚C
38 sec.
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 of the high-voltage
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 ....................approx. 1.0 Ω
b. Secondary winding ...............approx. 87 Ω
c. Filament winding...................less than 1Ω
If the reading obtained are not stated as above, then the power transformer is probably faulty and
should be replaced.
CARRY OUT 4R 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. 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 more than 100 kΩ in the other direction.
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.
B
C
HIGH VOLTAGE RECTIFIER
Page 12
R-350F
10
G MOTOR WINDING TEST
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
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
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 MΩ because 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.
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 COM; Common terminal
Released Open circuit Short circuit NO; Normally open terminal
Depressed Short circuit Open circuit NC; Normally close terminal
If incorrect readings are obtained, make the necessary switch adjustment or replace the switch.
CARRY OUT 4R CHECKS.
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 table below.
CARRY OUT 4R CHECKS.
Table: Thermal cut-out Test
Temperature of "ON" condition Temperature of "OFF" condition Indication of ohmmeter
Parts Name (closed circuit) (˚C) (open circuit) (˚C) (When room 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 95˚C (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 125˚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.
F THERMAL CUT-OUT 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.
Page 13
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11
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
Table: Resistance of Motor
Motors Resistance
Fan motor Approximately 405 Ω
Turntable motor Approximately 14.8 kΩ
If incorrect readings are obtained, replace the motor.
CARRY OUT
4R CHECKS
CARRY OUT 3D CHECKS.
1. If the fuse F10A 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 F10A is blown when the door is opened, check the 1st. latch switch, 2nd. interlock relay
and monitor switch.
If the fuse F10A is blown by incorrect door switching replace the defective switch(s) and the fuse
F10A.
CARRY OUT 4R CHECKS.
CAUTION: ONLY REPLACE FUSE F10A WITH THE CORRECT VALUE REPLACEMENT
H BLOWN FUSE F10A
I NOISE 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.
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
If incorrect readings are obtained, replace the noise filter unit.
CARRY OUT 4R CHECKS.
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 high voltage fuse.
CARRY OUT 4R CHECKS.
CAUTION: ONLY REPLACE THE HIGH VOLTAGE FUSE WITH THE CORRECT VALUE RE-
PLACEMENT
J HIGH VOLTAGE FUSE TEST
The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore,
unlike conventional microwave ovens, proper maintenance cannot be performed with only a
voltmeter and ohmmeter. In this service manual, the touch control panel assembly is divided into two
units, Control Unit and Key Unit, and also the Control Unit is divided into two units, CPU Unit and
Power Unit, and troubleshooting by unit replacement is described according to the symptoms
indicated.
K TOUCH CONTROL PANEL ASSEMBLY TEST
N
L
Cx
L
L
Cy
WHT
RED
L (min) Cx ± 20% Cy ± 20%
600µH 0.068µF 0.0022µF
Page 14
R-350F
12
M RELAY TEST
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
L KEY UNIT TEST
If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon cable
is making good contact, verify that the 2nd. interlock relay control switch operates properly; that is the
contacts are closed when the door is closed and open when the door is open.
If the door 2nd. interlock relay control switch is good, disconnect the flat ribbon cable that connects
the key unit to the control unit and make sure the 2nd. interlock relay control switch is closed (either
close the door or short the 2nd. interlock relay control switch connector). 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 a
beep 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.
CARRY OUT 3D CHECKS.
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 (Procedure L) to determine if control unit is faulty.
2-1 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.
Remove the outer case and check voltage between Pin No 1 of the 2-pin connector (A) and the normal
open terminal of the relay RY1 on the power unit with an A.C. voltmeter. The meter should indicate
230 - 240 volts, if not check oven circuit.
G 1 G 2 G 3 G 4 G 5 G 6 G 7 G 8
G 9
G10
G11
G12
G13
G14
DINNER
PLATE
FROZEN
DINNER
POWER
LEVEL
STOP
CLEAR
CASSEROLE
BEVERAGE
PIZZA
PASTA
MEAL
RICE/
PASTA
SOUP
TIMER CLOCK
HELP
PIE
EASY
DEFROST
EXPRESS
DEFROST
EXPRESS
COOK
EXPRESS
MEAL
VEGETABLES
INSTANT COOK
START
12345
67890
MORE
LESS
Page 15
R-350F
13
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.
CARRY OUT 3D CHECKS.
STEPS OCCURRENCE CAUSE OR CORRECTION
The rated AC voltage is not present between
1 Pin No. 1 of the 2-pin connector (A) and the Check supply voltage and oven power cord.
normal open terminal of the relay RY1.
2
The rated AC voltage is present to 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.
4 Pattern at "a" and "b" are broken. *Insert the coil RCILF2003YAZZ between "c" and "d".
NOTE: *At the time of making these repairs,
make a visual inspection of the varistor.
Check for burned damage and examine the transformer with a tester for the
presence of layer short-circuit (check
the primary coil resistance). If any abnormal condition is detected, replace
the defective parts.
CARRY OUT 4R CHECKS.
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
N PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD
(PWB) IS OPEN
RY1 and RY2 Relay Test
These relays are operated by D.C. voltage.
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking 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. 24.0V D.C. Oven lamp / Turntable motor / Cooling fan motor
RY2 APPROX. 23.0V D.C. Power transformer
CARRY OUT 4R CHECKS.
RY1
VRS1
T1
RY3
(J1)
a
b
c
d
Page 16
R-350F
14
TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
The touch control section consists of the following units.
(1) Key Unit
(2) Control Unit (The Control Unit consists of Power Unit
and LSI 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 P00-P07.
When a key pad is touched, a signal is completed through
the key unit and passed back to the LSI through P14-P17,
ANI6 and ANI7 to perform the function that was requested.
Control Unit
Control unit consists of LSI, reset circuit, indicator circuit,
power source circuit, relay circuit, buzzer circuit, synchronizing signal circuit and back light circuit.
1) Reset Circuit
This circuit generates a signal which resets the LSI to
the initial state when power is supplied.
2) Indicator Circuit
This circuit consists of 40 segments and 16 common
electrodes using a Liquid Crystal Display. The Liquid
Crystal Display (LCD) is drived by LCD driver IC3.
3) Power Source Circuit
This circuit generates voltages necessary in the control
unit from the AC line voltage.
In addition, the synchronizing signal is available in
order to compose a basic standard time in the clock
circuit.
Symbol Voltage Application
VC -5V LSI(IC1)
4) Relay Circuit
A circuit to drive the magnetron, fan motor, turntable
motor and light the oven lamp.
5) Buzzer Circuit
The buzzer is responsive to signals from the LSI to emit
audible sounds (key touch sound and completion
sound).
6) 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.
7) 2nd. Interlock Relay Control Switch
A switch to “tell” the LSI if the door is open or closed.
8) Back Light Circuit
A circuit to drive the back light (Light emitting diodes
LD10- LD15).
LSI
The I/O signal of the LSI is detailed in the following table.
Pin No. Signal I/O Description
1 COM5 OUT Common data signal : COM11.
Connected to LCD signal COM11.
2 COM4 OUT Common data signal : COM12.
Connected to LCD signal COM12.
3 COM3 OUT Common data signal : COM13.
Connected to LCD signal COM13.
4 COM2 OUT Common data signal : COM14.
Connected to LCD signal COM14.
5 COM1 OUT Common data signal : COM15.
Connected to LCD signal COM15.
6 COM0 OUT Common data signal : COM16.
Connected to LCD signal COM16.
7-10 VL1-VL4 IN Power source voltage input terminal.
Standard voltage for LCD.
11 VL5 IN Power source voltage input terminal.
Standard voltage for LCD. Connected to GND.
12-14 C3-C1 IN Terminal not used.
15 VLIN IN Terminal not used.
16 VREG OUT Terminal not used.
17 NC Terminal not used.
18 VSS IN Power source voltage : -5.0V.
The power source voltage to the LSI is input to VSS terminal. Connected to VC.
Page 17
R-350F
15
Pin No. Signal I/O Description
19-21 P27-P25 OUT Terminal not used.
22-26 P24-P20 IN Terminal not used.
27 P47 IN
To input signal which communicates the door open/close information to LSI.
Door close "H" level signal (0V). Door open "L" level signal (-5V).
28 P46 OUT Terminal not used.
29 P45 OUT
Oven lamp, fan motor and turntable motor driving signal.
To turn on and off shut off relay (RY1). The
square waveform voltage is delivered to the
RY1 driving circuit and RY2 control circuit.
30 P44 OUT Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2). The
signals holds "L" level during microwave cook-
ing and "H" level while not cooking. In other
cooking modes (variable cooking) the signal
turns to "H" level and "L" level in repetition
according to the power level.
31 P43 Terminal not used.
32 CNTR0 OUT Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
33 P41 OUT Terminal not used.
34 INT0 IN Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of LSI.
35 P07 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AIN7, P14, P15, P16 and P17
terminal while one of G1 line keys on key matrix is touched.
36 P06 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AIN7, P14, P15, P16 and P17
terminal while one of G2 line keys on key matrix is touched.
37 P05 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AIN7, P14, P15, P16 and P17
terminal while one of G3 line keys on key matrix is touched.
38 P04 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AIN7, P14, P15, P16 and P17
terminal while one of G4 line keys on key matrix is touched.
39 P03 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AIN7, P14, P15, P16 and P17
terminal while one of G5 line keys on key matrix is touched.
40 P02 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AIN7, P14, P15, P16 and P17
terminal while one of G6 line keys on key matrix is touched.
41 P01 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AIN7, P14, P15, P16, P17
and AIN6 terminal while one of G7 line keys on key matrix is touched.
42 P00 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AIN7, P14, P15, P16 and P17
terminal while one of G8 line keys on key matrix is touched.
43 P17 IN Signal coming from touch key.
When either G9 line on key matrix is touched, a corresponding signal out of P00-P07 will
be input into P17. When no key is touched, the signal is held at "H" level.
44 P16 IN Signal similar to P17.
When either G10 line on key matrix is touched, a corresponding signal will be input into P16.
45 P15 IN Signal similar to P17.
When either G11 line on key matrix is touched, a corresponding signal will be input into P15.
20.0 msec.
During cooking
H : GND
L : -5V
100
PERCENT
70
PERCENT
H : GND
L : -5V
H : GND
L : -5V
ON
ON
OFF
OFF OFF
24 sec.
8 sec.
A
B
0.1 sec.
2.0 sec.
H : GND
L : -5V
H : GND
L : -5V
20.0 msec.
H : GND
L : -5V
Page 18
R-350F
16
46 P14 IN Signal similar to P17.
When either G12 line on key matrix is touched, a corresponding signal will be input into P14.
47 AIN7 IN Signal similar to P17.
When either G13 line on key matrix is touched, a corresponding signal will be input into AIN7.
48 AIN6 IN Input terminal to judge the model.
The signal out of P07 will be input into AIN6 through G1 line on key matrix. The LSI will
judge the model by this signal.
49-50 AIN5-AIN4 IN Connected to VC.
51 RESET IN Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied. Temporarily set "L"
level the moment power is applied, at this time the LSI is reset. Thereafter set at "H" level
52 NC Terminal not used.
53 XCOUT OUT Terminal not used.
54 XCIN IN Connected to VC.
55 NC Terminal not used.
56 VCC IN Power source voltage: GND(0V).
The power source voltage to drive LSI is input to VCC terminal.
57 OSCSEL IN Connected to VC(-5V).
58 XOUT OUT Internal clock oscillation output.
Output to control oscillation input of XIN.
59 VSS IN Power source voltage: -5.0V.
The power source voltage to the LSI is input to VSS terminal. Connected to VC.
60 NC Terminal not used.
61 XIN IN Internal clock oscillation frequency control input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XOUT terminal.
62 NC Terminal not used.
63-66
AIN3-AIN0
IN Terminal to change cooking input according to the Model.
By using the A/D converter contained in the LSI, DC voltage in accordance with the Model
in operation is applied to set up its cooking constant.
67 COM8 OUT Common data signal : COM8. Connected to LCD signal COM8.
68 COM9 OUT Common data signal : COM7. Connected to LCD signal COM7.
69 COM10 OUT Common data signal : COM6. Connected to LCD signal COM6.
70 COM11 OUT Common data signal : COM5. Connected to LCD signal COM5.
71 COM12 OUT Common data signal : COM4. Connected to LCD signal COM4.
72 COM13 OUT Common data signal : COM3. Connected to LCD signal COM3.
73 COM14 OUT Common data signal : COM2. Connected to LCD signal COM2.
74 COM15 OUT Common data signal : COM1. Connected to LCD signal COM1.
75-102 SEG67-SEG40 OUT Terminal not used.
103-142 SEG39-SEG0 OUT Segment data signal.
Connected to LCD.
The relation between signals and LCD are as follows:
LSI signal LCD LSI signal LCD LSI signal LCD
(Pin No.) segment (Pin No.) segment (Pin No.) segment
SEG 39 (103).......... SEG 1 SEG 25 (117)..........SEG 15 SEG 12 (130) ........ SEG 28
SEG 38 (104).......... SEG 2 SEG 24 (118)..........SEG 16 SEG 11 (131) ........ SEG 29
SEG 37 (105).......... SEG 3 SEG 23 (119)..........SEG 17 SEG 10 (132) ........ SEG 30
SEG 36 (106).......... SEG 4 SEG 22 (120)..........SEG 18 SEG 9 (133) ........ SEG 31
SEG 35 (107).......... SEG 5 SEG 21 (121)..........SEG 19 SEG 8 (134) ........ SEG 32
SEG 34 (108).......... SEG 6 SEG 20 (122)..........SEG 20 SEG 7 (135) ........ SEG 33
SEG 33 (109).......... SEG 7 SEG 19 (123)..........SEG 21 SEG 6 (136) ........ SEG 34
SEG 32 (110).......... SEG 8 SEG 18 (124)..........SEG 22 SEG 5 (137) ........ SEG 35
SEG 31 (111).......... SEG 9 SEG 17 (125)..........SEG 23 SEG 4 (138) ........ SEG 36
SEG 30 (112).......... SEG 10 SEG 16 (126)..........SEG 24 SEG 3 (139) ........ SEG 37
SEG 29 (113).......... SEG 11 SEG 15 (127)..........SEG 25 SEG 2 (140) ........ SEG 38
SEG 28 (114).......... SEG 12 SEG 14 (128)..........SEG 26 SEG 1 (141) ........ SEG 39
SEG 27 (115).......... SEG 13 SEG 13 (129)..........SEG 27 SEG 0 (142) ........ SEG 40
SEG 26 (116).......... SEG 14
143 COM7 OUT Common data signal : COM9. Connected to LCD signal COM9.
144 COM6 OUT Common data signal : COM10. Connected to LCD signal COM10.
Pin No. Signal I/O Description
Page 19
R-350F
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
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 aluminium 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
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 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 locations.
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 SERVICING
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 sensor-related controls of the
touch control panel by using the dummy resistor(s).
4. Servicing Tools
Tools required to service the touch control panel
assembly.
1) Soldering iron: 30W
(It is recommended to use a soldering iron with a
grounding terminal.)
2) Oscilloscope: Single beam, frequency range: DC10MHz 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 aluminium foil applied for preventing static
electricity.
2) Connect the connectors of the key unit to 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.
Transistor
2SB1238
Transistor
KRC243M
approx. 1M ohm
E
C
B
E
C
B
Page 20
R-350F
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 damage
(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 or 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:
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
voltage capacitor, High voltage rectifier assembly
and High voltage fuse.
2) Hot parts:
Oven lamp, Magnetron, High voltage transformer
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)
Fan blade, Fan motor, Switch.
3. Do not catch the wire leads in the outer case cabinet.
4. Insert the positive lock connector certainly until its
pin 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.
Re-install
1. Rest transformer on the bottom plate with its primary
terminals toward the oven face plate.
2. Secure transformer with four screws to bottom plate.
3. Re-connect wire leads (primary and high voltage) to
power transformer and filament leads of transformer to
magnetron and high voltage capacitor. Refer to
"PICTORIAL DIAGRAM".
4. Re-install outer case and check that oven is operating
properly.
OUTER CASE REMOVAL
To remove the components, procedure as follows.
1. Disconnect oven from power supply.
2. Open the oven door and block it open.
3. Remove four (4) screws from rear and one (1) screw
along the right side edge of case.
4. Slide the entire case back out about 1 inch (3 cm) to
free it from retaining clips on the cavity face plate.
Removal
1. CARRY OUT 3D CHECKS.
2. Disconnect wire leads (primary and high voltage) from
power transformer.
3. Disconnect filament leads from the magnetron and the
high voltage capacitor.
4. Remove four (4) screws holding transformer to bottom
plate.
5. Remove transformer from bottom plate.
POWER TRANSFORMER REMOVAL
5. Lift entire case from the unit.
6. Discharge the H. V. capacitor before carrying out any
further work.
7. Do not operate the oven with the outer case removed.
NOTE: Step 1, 2 and 6 form the basis of the 3D checks.
CAUTION: DISCONNECT OVEN FROM POWER SUP-
PLY BEFORE REMOVING OUTER CASE.
Page 21
R-350F
19
HIGH VOLTAGE RECTIFIER, HIGH VOLTAGE FUSE AND HIGH VOLTAGE CAPACITOR REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnect the brown and blue wires of power supply
cord from the noise filter.
3. Disconnect the wire leads of the main wire harness
from the noise filter.
4. Disconnect the high voltage fuse from the power
transformer.
5. Disconnect filament lead of the power transformer from
the high voltage capacitor.
6. Disconnect high voltage wire of the high voltage rectifier
assembly from the magnetron.
7. Remove two (2) screw holding capacitor holder to the
oven cavity rear plate.
8. Remove one (1) screw holding high voltage rectifier
assembly to capacitor holder.
9. Disconnect rectifier terminal from capacitor.
Now, the high voltage rectifier assembly is free.
10.Disconnect high voltage fuse from capacitor.
Now, the high voltage fuse is free.
11.Remove the high voltage capacitor from the capacitor
holder. Now, the high voltage capacitor is free.
CAUTION: WHEN REPLACING HIGH VOLTAGE
RECTIFIER AND HIGH VOLTAGE CAPACITOR,
GROUND SIDE TERMINAL OF THE HIGH VOLTAGE
RECTIFIER MUST BE SECURED FIRMLY WITH A
GROUNDING SCREW.
MAGNETRON REMOVAL
Removal
1. CARRY OUT 3D CHECKS.
2. Disconnect wire leads from magnetron.
3. Remove the four (4) screws holding chassis support to
oven cavity front plate, oven cavity rear plate, magnetron
and fan duct.
4. Remove the chassis support from oven.
5. Carefully remove the four (4) screws holding magnetron
to waveguide flange.
6. Lift up magnetron with care so that magnetron antenna
is not hit by any metal object around antenna.
7. Remove the two (2) screws holding the magnetron
duct to the magnetron.
8. Remove the magnetron duct from the magnetron.
9. Now, the magnetron is free.
Re-install
1. Re-install the magnetron duct to the magnetron with
the two (2) screws.
2. Re-install the magnetron to waveguide flange with the
four (4) screws.
3. Insert the two (2) tabs of the chassis support to the oven
cavity front plate and back plate.
4. Re-install the chassis support to oven cavity front
plate, oven cavity rear plate, magnetron and fan duct
with the four (4) screws.
5. Reconnect the wire leads to the magnetron. Refer to
"PICTORIAL DIAGRAM".
6. Re-install outer case and check that the oven is
operating properly.
CAUTION: WHEN REPLACING MAGNETRON, BE
SURE THE R.F. GASKET IS IN PLACE AND
MOUNTING SCREWS ARE TIGHTENED
SECURELY.
1. CARRY OUT 3D CHECKS.
2. Pushing the lever of positive lock® connector.
3. Pull out the positive lock® connector.
CAUTION: WHEN YOU (SERVICE ENGINEERS) CON-
NECT THE POSITIVE LOCK® CONNECTORS
TO THE TERMINALS, CONNECT THE POSITIVE LOCK® SO THAT THE LEVER FACE
YOU (SERVICE ENGINEERS).
POSITIVE LOCK® CONNECTOR REMOVAL
Figure C-1. Positive lock® connector
1. Open covers of the terminal insulator by using small flat
type screw driver.
2. Remove the receptacle from the terminal insulator.
3. Now, the terminal insulator is free.
Installation
1. Insert the receptacle into terminal insulator.
2. Close covers of the terminal insulator, as shown
illustlated below.
TERMINAL INSULATOR REPLACEMENT
Terminal
Push
Pull down
1
2
Lever
Positive lock®
connector
Terminal
insulator
Flat type
screw driver
Receptacle
Covers
Page 22
R-350F
20
1. CARRY OUT 3D CHECKS.
2. Disconnect the wire leads from panel components.
3. Remove the one (1) screw holding the control panel
assembly to the oven flange.
4.
Slide the control panel assembly upward and remove it.
5. Now, individual components can be removed.
NOTE: 1. Before attaching a new key unit, wipe off
remaining adhesive on the control panel frame
surfaces completely with a soft cloth soaked in
alcohol.
2. When attaching the key unit to the control panel
frame, adjust the upper edge and right edge of
the key unit to the correct position of control
panel frame.
3. Stick the key unit firmly to the control panel
frame by rubbing with soft cloth not to scratch.
TURNTABLE MOTOR REMOVAL
1. Disconnect oven from power supply.
2. Remove turntable and turntable support from oven
cavity.
3. Lay the oven on it's backside. Remove the turntable
motor cover by snipping off the material in four corner.
4. Where the corners have been snipped off bend corner
areas flat. No sharp edge must be evident after removal
of the turntable motor cover.
5. Disconnect wire leads from turntable motor.
(See "Positive lock connector removal")
6. Remove two (2) screws holding turntable motor to oven
cavity.
7. Now the turntable motor is free.
8. After replacement use the one (1) screw to fit the
turntable motor cover.
NOTE: The one (1) screw to fit the turntable motor cover
should be XHTSD40P08RV0.
COOLING FAN MOTOR REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnect the wire leads from the fan motor.
3. Remove the magnetron and the chassis support from
the waveguide, referring to "MAGNETRON REMOVAL".
4. Release the snap of the main wire harness from the fan
duct.
5. Remove one (1) screw holding the fan duct assembly
to the oven cavity.
6. Release the main wire harness from the hole of the fan
duct.
7. Release the fan duct from the waveguide flange.
8. Release the fan duct assembly from the oven cavity.
9. Remove the fan blade from the fan motor shaft according
the following procedure.
1) Hold the edge of the rotor of the fan motor by using a
pair of grove joint pliers.
CAUTION:
* Make sure that any pieces do not enter the gap
between the rotor and the stator of the fan motor
because the rotor is easily 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 disfigure the bracket by touching with the
pliers.
2) Remove the fan blade from the shaft of the fan motor
by pulling and rotating the fan blade with your hand.
3) Now, the fan blade will be free.
CAUTION:
* Do not reuse the removed fan blade because the
hole (for shaft) may be larger than normal.
10.Remove the two (2) screws holding the fan motor to the
fan duct.
11.Now, the fan motor is free.
INSTALLATION
1. Install the fan motor to the fan duct with the two (2)
screws.
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.
2) Apply the screw lock tight into the hole (for shaft) of the
fan blade.
3) Install the fan blade to the shaft of fan motor by pushing
the fan blade with a small, light weight, ball peen
hammer or rubber mallet.
CAUTION:
* Do not hit the fan blade strongly when installed
because the bracket may be disfigured.
* Make sure that the fan blade rotates smooth after
installation.
* Make sure that the axis of the shaft is not slanted.
3. Catch three holes of fan duct on three tabs of the
waveguide flange.
4. Install the fan duct assembly to the oven cavity with the
one (1) screw.
Figure C-2. CPU unit
Printed wiring board
of CPU unit
Liquid Crystal
Display (LCD)
Ribbon cable
CONTROL PANEL ASSEMBLY REMOVAL
CPU UNIT
NOTE: Handle the CPU unit carefully so that the ribbon
cable does not come off. Because the ribbon cable
is sticked on the LCD and the printed wiring board
only by heated paste.
Page 23
R-350F
21
5. Insert the snap of the main wire harness to the hole of
the fan duct and insert the main wire harness into the
hole of the fan duct.
6. Install the chassis support and the magnetron to oven
cavity.
7. Connect the wire leads to the fan motor, referring to the
pictorial diagram.
Side View
Rear View
POWER SUPPLY CORD REPLACEMENT
1. CARRY OUT 3D CHECKS.
2. Remove the one (1) purse lock holding the wire leads
of the main wire harness and the earth wire of the
power supply cord.
3. Remove the single (1) screw holding the green/ yellow
wire to the bottom plate.
4. Disconnect the leads of the power supply cord from the
noise filter, referring to the Figure C-4 (a).
5. Release the moulding cord stopper of the power supply
cord from the square hole of the oven cavity back plate,
referring to the Figure C-4 (b).
6. Now, the power supply cord is free.
Re-install
1. Insert the moulding cord stopper of power supply cord
into the square hole of the rear cabinet, referring to the
Figure C-4 (b).
2. Install the earth wire lead of power supply cord to the
bottom plate with one (1) screw and tight the screw.
3. Connect the brown and blue wire leads of power supply
cord to the noise filter correctly, referring to the Pictorial
Diagram.
4. Hold the the wire leads of the main wire harness and
the earth wire of the power supply cord with the one (1)
purse lock.
5. Re-install outer case and check that the oven is
operating properly.
1ST. LATCH SWITCH, 2ND. INTERLOCK RELAY CONTROL SWITCH AND MONITOR
SWITCH REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnect wire leads from the switches.
3. Remove two (2) screws holding latch hook to oven
flange.
4. Remove latch hook assembly from oven flange.
5. Push outward on the two (2) retaining tabs holding
switch in place.
6. Switch is now free.
Figure C-4 (a). Power Supply Cord Replacement Figure C-4 (b) Power Supply Cord Replacement
Gap
Rotor
Bracket
Stator
Groove joint pliers
Coil
Shaft
Axis
Stator
Rotor
These are the positions
that should be pinched
with pliers.
Shaft
Table
Center of
bracket
N
L
Power Supply
Cord
Oven Cavity
Back Plate
Bottom Plate
Screw
Green/Yellow Wire
Brown Wire
Blue Wire
Fuse M10A
Purse Lock
White Wire
Red Wire
Noise Filter
WHT
RED
Power Supply
Cord
Oven Cavity
Back Plate
Square
Hole
Moulding
Cord Stopper
Figure C-3. Fan Motor Removal
Re-install
1. Re-install each switch in its place. The 1st. latch and
monitor switches are in the lower position and the
2nd. interlock relay control switch is in the upper
position.
2. Re-connect wire leads to each switch.
Refer to pictorial diagram.
3. Secure latch hook (with two (2) mounting screws) to
oven flange.
4. Make sure that the monitor switch is operating properly
and check continuity of the monitor circuit. Refer to
chapter "Test Procedure" and Adjustment procedure.
Page 24
R-350F
22
Choke Cover
Door Frame
Putty Knife
Latch Hook
2nd. Interlock
Reley Control
Switch
Latch
Heads
Door
Monitor Switch
1st. Latch
Switch
1ST. LATCH SWITCH, 2ND. INTERLOCK RELAY CONTROL SWITCH AND MONITOR
SWITCH ADJUSTMENT
If the 1st. latch switch, 2nd. latch switch, stop switch and
monitor switch do not operate properly due to a
misadjustment, the following adjustment should be made.
1. Loosen the two (2) screws holding latch hook to the
oven cavity front flange.
2. With door closed, adjust latch hook by moving it back
and forth, and up and down. In and out play of the door
allowed by the upper and lower position of the latch
hook should be less than 0.5mm. The vertical position
of the latch hook should be adjusted so that the 1st.
latch switch and stop switch are activated with the door
closed. The horizontal position of the latch hook should
be adjusted so that the plunger of the monitor switch
and 2nd. latch switch are pressed with the door closed.
3. Secure the screws with washers firmly.
4. Check all switches operation. If each switch has not
activated with the door closed, loosen screw and adjust
the latch hook position.
After adjustment, check the following.
1. In and out play of door remains less than 0.5mm when
in the latched position. First check upper position of
latch hook, pushing and pulling upper portion of door
toward the oven face. Then check lower portion of the
latch hook, pushing and pulling lower portion of the
door toward the oven face. Both results (play in the
door) should be less than 0.5mm.
2. The contacts of the 1st. latch switch and stop switch
open within 0.9mm gap between right side of cavity
face plate and door when the door is open.
3. Monitor switch contacts close when door is opened.
4. The 2nd. latch switch contacts open when the door is
opened.
5. Re-install outer case and check for microwave leakage
around door with an approved microwave survey meter.
(Refer to Microwave Measurement Procedure.)
Figure C-5. Latch Switch Adjustments
REMOVAL
1. Disconnect the power supply cord.
2. Open button and open the door slightly.
3. Insert a putty knife (thickness of about 0.5mm) into the
gap between the choke cover and door frame as shown
in Figure C-6 to free engaging parts.
4. Pry the choke cover by inserting a putty knife as shown
Figure C-6.
5. Release choke cover from door panel.
6. Now choke cover is free.
7. Release two (2) pins of door panel from two (2) holes
of upper and lower oven hinges by lifting up.
8. Now, door panel with door frame is free from oven
cavity.
NOTE: When carrying out any repair to the door, do
not bend or warp the slit choke (tabs on the
door panel assembly) to prevent microwave
leakage.
Figure C-6. Door Disassembly
9. Remove the four (4) screws holding the door panel to
the door frame.
DOOR REPLACEMENT
10.Release door panel from eight (8) tabs of door frame.
11.Now, door panel with sealer film is free.
12.Tear sealer film from door panel.
13.Now, door panel is free.
14.Slide latch head upward and remove it from door frame
with releasing latch spring from door frame and latch
head.
15.Now, latch head and latch spring are free.
16.Remove the door screen from the door frame.
17.Now, door screen is free.
RE-INSTALL
1. Re-install door screen to door frame.
2. Re-install the latch spring to the latch head. Re-install
the latch spring to the door frame. Re-install latch head
to door frame.
3. Re-install door panel to door frame by fitting eight (8)
tabs of door frame to eight (8) holes of door panel.
4. Hold the door panel to the door frame with the four (4)
screws.
5. Put sealer film on door panel. Refer to “Sealer Film”
about how to handle new one.
6. Catch two (2) pins of door panel on two (2) hole of upper
and lower oven hinges.
7. Re-install choke cover to door panel by pushing.
Note: After any service to the door;
(A) Make sure that 1st. latch switch, 2nd. interlock
relay control switch and monitor switch are
operating properly. (Refer to chapter “Test
Procedures”.).
(B) An approved microwave survey meter should be
used to assure compliance with proper microwave
Page 25
R-350F
23
Sealer film
Backing film
Adhesive tape
Pin
Pin
Upper
Oven Hinge
Upper Oven
Hinge
Lower Oven
Hinge
Lower
Oven Hinge
Slit Choke of
Door Panel
Choke Cover
radiation emission limitation standards.
After any service, make sure of the following :
1. Door latch heads smoothly catch latch hook through
latch holes and that latch head goes through center of
latch hole.
2. Deviation of door alignment from horizontal line of
cavity face plate is to be less than 1.0mm.
3. Door is positioned with its face pressed toward cavity
face plate.
4. Check for microwave leakage around door with an
approved microwave survey meter. (Refer to Microwave
Measurement Procedure.)
Note: The door on a microwave oven is designed to act
as an electronic seal preventing the leakage of
microwave energy from oven cavity during cook
cycle. This function does not require that door be
air-tight, moisture (condensation)-tight or lighttight. Therefore, occasional appearance of
moisture, light or sensing of gentle warm air
movement around oven door is not abnormal and
do not of themselves indicate a leakage of
microwave energy from oven cavity.
Figure C-7. Door Replacement
SEALER FILM
Installation
1. Put the adhesive tape on the backing film of the sealer
film as shown in Fig. C-8.
2. Tear the backing film by pulling the adhesive tape.
3. Put the pasted side of the sealer film on the door panel.
Figure C-8. Sealer film
Page 26
R-350F
24
MICROWAVE MEASUREMENT
After adjustment of door latch switches, monitor switch
and door are completed individually or collectively, the
following leakage test must be performed with a survey
instrument and it must be confirmed that the result meets
the requirements of the performance standard for microwave oven.
REQUIREMENT
The safety switch must prevent microwave radiation emission in excess of 5mW/cm2 at any point 5cm or more from
external surface of the oven.
PREPARATION FOR TESTING:
Before beginning the actual test for leakage, proceed as
follows;
1. Make sure that the test instrument is operating normally
as specified in its instruction book.
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
± 5˚C in the centre 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.
mW cm
2
mW cm
2
Microwave leakage measurement at 5 cm distance
SHARP
Page 27
R-350F
25
SCHEMATIC
NOTE: CONDITION OF OVEN
1.DOOR CLOSED
2.CLOCK APPEARS ON DISPLAY
NOTE: " " indicates components with potentials above 250V.
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. COOKING TIME PROGRAMMED
3. START KEY TOUCHED
Figure O-2. Oven Schematic-Cooking Condition
Figure O-1. Oven Schematic-OFF Condition
POWER TRANSFORMER
MAGNETRON
H.V. RECTIFIER
H. V. FUSE
0.75A
TURNTABLE MOTOR
FAN MOTOR
OVEN LAMP
CONTROL
UNIT
THERMAL
CUT-OUT
95˚C (MG)
1ST. LATCH
SWITCH
B1
B2
A2
OL
FM
TTM
N.O.
COM.
RY-1
N.O.
COM.
A1
THERMAL
CUT-OUT
125˚C (OVEN)
RY-2
CAPACITOR
1.13µ
AC2300V
2ND.
INTERLOCK
RELAYCONTROL
SWITCH
MONITOR SWITCH
NOISE FILTER
EARTH
BLU
BRN
230-240V 50Hz
G-Y
FUSE
F10A
N
L
LINE CROSS CAPACITOR
0.068µ/AC250V
NOISE SUPPRESSION COIL
LINE BYPASS
CAPACITOR
0.0022µ/AC250V
LINE BYPASS
CAPACITOR
0.0022µ/AC250V
POWER TRANSFORMER
MAGNETRON
H.V. RECTIFIER
H. V. FUSE
0.75A
CAPACITOR
1.13µ
AC2300V
TURNTABLE MOTOR
FAN MOTOR
OVEN LAMP
2ND.
INTERLOCK
RELAYCONTROL
SWITCH
MONITOR SWITCH
CONTROL
UNIT
THERMAL
CUT-OUT
95˚C (MG)
1ST. LATCH
SWITCH
B1
B2
A2
OL
FM
TTM
N.O.
COM.
RY-1
N.O.
COM.
A1
THERMAL
CUT-OUT
125˚C (OVEN)
NOISE FILTER
RY-2
EARTH
BLU
BRN
230-240V 50Hz
G-Y
FUSE
F10A
N
L
LINE CROSS CAPACITOR
0.068µ/AC250V
NOISE SUPPRESSION COIL
LINE BYPASS
CAPACITOR
0.0022µ/AC250V
LINE BYPASS
CAPACITOR
0.0022µ/AC250V
Page 28
R-350F
26
1
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
23456
123456
Figure S-1. Pictorial Diagram
HIGH VOLTAGE
CAPACITOR
HIGH VOLTAGE
FUSE
H.V.
RECTIFIER
HIGH VOLTAGE COMPONENTS
MAGNETRON
TURNTABLE
MOTOR
POWER
TRANSFORMER
GRY
RED
GRY
RED
WHT
YLW
WHT
BLK
WHT
WHT
RED
WHT
WHT
THERMAL
CUT-OUT (MG)
NOISE FILTER
FAN MOTOR
THERMAL
CUT-OUT (OVEN)
BLK
BLK
RED
GRY
WHT
BLK
BLU
BRN
POWER
SUPPLY
CORD
EARTH
NEUTRAL
LIVE
G
/
Y
N
L
WHT
RED
COM.
MONITOR
SWITCH
COM.
N.O.
N.C.
2ND. INTERLOCK
RELAY CONTROL
SWITCH
1ST. LATCH
SWITCH
COM.
NO
RED
RED
YLW
BLK
YLW
RED
GRN
GRN
GRY
WHT
GRY
WHT
2
1
GRY
WHT
YLW
BLK
RY2
RY1
SP1
IC1
SECONDARY
INTERLOCK
RELAY
CN-A
CN-B
CN-G
CN-C
CN-C
CN-A
T1
1
2
1
2
N.O.
N.O.
COM.
COM.
CONTROL UNIT
(CPU UNIT)
(POWER UNIT)
(Lower)
(Upper)
(Oven side)
(Cabinet side)
GRN
RED
2
1
CN-B
GRN
GRN
OVEN LAMP
Page 29
R-350F
27
1
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
23456
123456
Figure S-2. Power unit Circuit
+
–
+
–
+
–
A 1
CN-A
R4 27
D5
T1
a
b
c
d
VRS1
(J1)
D7D8
1SS270A1SS270A
10G471K
C1 0.1µ/50v
C3 0.1µ/50v
C5 10µ/35v
C2 1000µ/35v
C4 10µ/35v
1SS270A1SS270A
D1-D4
11ES1
D6
R5 4.7k
R3 390 1/2w
R2 510 1w
R6 3.3k
Q2 2SB1238
SP1 PKM22EPT
RY1
RY2
Q3 KRC243M
CN-C
12PIN LEAD
WIRE HARNESS
LED
GND
VC
VA
INT
VR
BUZZER
MICRO
NC
NC
OVEN LAMP
TURNTABLE
MOTOR
FAN MOTOR
AC
AC
MICRO
2ND.
INTERLOCK
RELAY
CONTROL
SWITCH
2ND.
INTERLOCK
RELAY
CONTROL
SWITCH
OVEN LAMP
TURNTABLE
MOTOR
FAN MOTOR
C10
C 2
C 3
C 1
C 4
C 9
C 5
C 6
C 7
C 8
C11
C12
A 2
B 2
B 1
NO
NO
COM
COM
Page 30
R-350F
28
Figure S-3. CPU Unit Circuit
1
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
23456
123456
C-2
C-4
C-3
CN-C
: IF NOT SPECIFIED, 1/10W ± 5%
CN-G
C-10
C-9
C-1
C-6
C-5
C-7
C-8
C-12
C-11
G 1 G 2 G 3 G 4 G 5 G 6 G 7 G 8
G 9
G10
G11
G12
G13
G14
+
–
C10 47µ/16v
LD10 LD11 LD12
LD15 LD14 LD13
C11 0.1µ/50v
C40 0.01µ/25v
C60
C61
C62
C63
C64
C65
C14 0.01µ/25v
(J11) 4.7k
(J13) 4.7k
(J15) 4.7k
(J17) 4.7k
(J10)
(J12)
(J14)
(J16)
AIN0
AIN5AIN4
P07 P06 P05 P04 P03 P02 P01 P00
P17
P16
P15
P14
AIN7
AIN6
P45
P44
CNTR0
COM0
COM5
SEG34
SEG39
COM15
COM8
AIN1
VL1
VL2
VL3
VL4
AIN2
AIN3
R12 15k
R40 4.7k
R60
15k
R61
15k
R62
15k
R63
15k
R64
15k
R65
15k
R66
15k
R74 270k
R75 270k
R76 270k
R77 270k
R78 270k
R79 270k
R67
15k
D20
MA152WA
R11 15k
R19
4.7k
R18
4.7k
R17
4.7k
R16
4.7k
R15
4.7k
R10 1k
C93 4.7k
LIQUID CRYSTAL DISPLAY
C92 4.7k
R41 15k
R68 15k
R69 15k
R70 15k
R71 15k
R72 15k
R73 15k
C60-C65 330pF/50v
C12
0.1µ/50v
C20
0.1µ/50v
C15
0.1µ/50v
C16
0.1µ/50v
C17
0.1µ/50v
C18
0.1µ/50v
C13
0.01µ/25v
ZD10
UDZ4.3B
Q10
2SA1037AK
Q11
DTA143EAK
CF1
CST4.00MGW
SEG34
SEG35
COM5
37
72
73
108
109
144
36
1
COM4
COM3
COM2
COM1
COM0
VL1
VL2
VL3
VL4
VL5
C3C2C1
VLIN
VREG
NC
VSS
P27
P26
P25
P24
P23
P22
P21
P20
P47
P46
P45
P44
P43
CNTR0
P05 COM6
COM16
COM15
COM14
COM13
COM12
COM11
COM10
COM9
SEG40
SEG39
SEG38
SEG37
SEG36
SEG35
SEG34
SEG33
SEG32
SEG31
SEG30
SEG29
SEG28
SEG27
SEG26
SEG25
SEG24
SEG23
SEG22
SEG21
SEG20
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
COM1
COM2
COM3
COM4
COM5
COM6
COM7
COM8
COM7
SEG0
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
SEG24
SEG25
SEG26
SEG27
SEG28
SEG29
SEG30
SEG31
SEG32
SEG33
P04
P03
P02
P01
P00
P17
P16
P15
P14
AIN7
AIN6
AIN5
AIN4
RESET
NC
XCOUT
XCIN
NC
VCC
OSCSEL
XOUT
VSS
NC
XIN
NC
AIN3
AIN2
AIN1
AIN0
COM8
COM9
COM10
COM11
COM12
COM13
P41
INT0
P07
P06
SEG36
SEG37
SEG38
SEG39
SEG40
SEG41
SEG42
SEG43
SEG44
SEG45
SEG46
SEG47
SEG48
SEG49
SEG50
SEG51
SEG52
SEG53
SEG54
SEG55
SEG56
SEG57
SEG58
SEG59
SEG60
SEG61
SEG62
SEG63
SEG64
SEG65
SEG66
SEG67
COM15
COM14
IC-1
Q20
DTA143EAK
Q30
DTA143EAK
Q21
DTA123JKA
SENSOR DEFROST TURNTABLE OFF COOK
HELP
GND
INT
VC
LEDVRVA
OVEN LAMP
TURNTABLE
MOTOR
FAN MOTOR
BUZZER
MICRONC2ND.
INTERLOCK
RELAY
CONTROL
SWITCH
NC
NOTE
DINNER
PLATE
FROZEN
DINNER
POWER
LEVEL
STOP
CLEAR
CASSEROLE
BEVERAGE
PIZZA
PASTA
MEAL
RICE/
PASTA
SOUP
TIMER CLOCK
HELP
PIE
EASY
DEFROST
EXPRESS
DEFROST
EXPRESS
COOK
EXPRESS
MEAL
VEGETABLES
INSTANT COOK
START
12345
67890
MORE
LESS
Page 31
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Figure S-4. Printed Wiring Board
1
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
23456
123456
1
DIP
F
SW
R3
SP1
R2
E
B
R1
C4
C2
C5
RY2
RY1
VRS1
P
S
T1
RY3
D6
D1
D4
D8
D2
D3
(D20)
D5
R4
Q2
Q3
B
B
E
E
R6
D9
D7
(J2)
(J1)
(D10)
R5
(R9)
ZD1
1
2
C3
C1
CN - C
CN - A
(CN - B)
(CN - D)
SH - B SH - A
(RED) (GREEN)
1
1
1
2
2
12
Page 32
R-350F
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∆
*
*
*
*
∆
*
*
*
PARTS LIST
Note: The parts marked "∆" may cause undue microwave exposure.
The parts marked "*" are used in voltage more than 250V.
REF. NO. PART NO. DESCRIPTION Q'TY CODE
ELECTRIC PARTS
1- 1 QSW-MA147WRZZ 1st. latch switch/ 2nd. interlock relay control switch 2 AG
1- 1 QSW-MA085WRE0
1st. latch switch/ 2nd. interlock relay control switch (Interchangeable)
2AF
1- 1 QSW-MA137WRE0
1st. latch switch/ 2nd. interlock relay control switch (Interchangeable)
2AH
1- 2 FPWBFA354WRKZ Noise filter 1 AY
1- 2 FPWBFA353WRKZ Noise filter (Interchangeable) for production use 1-1- 3 QSW-MA148WRZZ Monitor switch 1 AF
1- 3 QSW-MA086WRE0 Monitor switch (Interchangeable) 1 AF
1- 3 QSW-MA138WRE0 Monitor switch (Interchangeable) 1 AH
1- 4 RTHM-A127WRZZ Thermal cut-out 125˚C (Oven) 1 AK
1- 5 QACCAA049WRZZ Power supply cord 1 AW
1- 5 QACCAA047WRE0 Power supply cord (Interchangeable) 1 AP
1- 6 FH-DZA088WRK0 High voltage rectifier assembly 1 AP
1- 6 FH-DZA094WRKZ High voltage rectifier assembly (Interchangeable) 1 AU
1- 7 RC-QZA293WRZZ High voltage capacitor 1 AV
1- 7 RC-QZA273WRZZ High voltage capacitor (Interchangeable)for production use 1-1- 8 RV-MZA295WRE0 Magnetron 1 BF
1- 9 RMOTEA403WRZZ Fan motor 1 AZ
1- 9 RMOTEA340WRE0 Fan motor (Interchangeable) 1 AX
1- 9 RMOTEA389WRE0 Fan motor (Interchangeable) for production use 1-1-10 QFS-CA026WRZZ Fuse F10A 1 AH
1-11 RLMPTA083WRZZ Oven lamp 1 AM
1-12 RMOTDA226WRE0 Turntable motor 1 AT
1-12 RMOTDA173WRE0 Turntable motor (Interchangeable) 1 AX
1-12 RMOTDA169WRE0 Turntable motor (Interchangeable) 1 AW
1-12 RMOTDA230WRE0 Turntable motor (Interchangeable) for production use 1-1-13 RTHM-A117WRE0 Thermal cut-out 95˚C (MG) 1 AK
1-13 RTHM-A079WRE0 Thermal cut-out 95˚C (MG) (Interchangeable) 1 AH
1-14 RTRN-A680WRZZ Power transformer 1 BM
1-15 QFS-IA002WRE0 High voltage fuse 0.75A 1 AQ
CABINET PARTS
2- 1 GCABUA834WRPZ Outer case cabinet 1 BD
2- 2 GDAI-A343WRWZ Bottom plate 1 AX
2- 3 GLEGPA074WRE0 Foot 1 AC
CONTROL PANEL PARTS
3- 1 DPWBFC084WRKZ Power unit (New Zealand only) 1 BB
3- 1A QCNCMA446DRE0 2-pin connector (CN-A) 1 AC
3- 1B QCNCMA275DRE0 2-pin connector (CN-B) 1 AB
3- 1C FW-VZA232DRE0 12pin lead wire (CN-C) 1 AE
C1 RC-KZA087DRE0 Capacitor 0.1 uF 50V 1 AA
C2 VCEAB31VW108M Capacitor 1000 uF 35V 1 AF
C3 RC-KZA087DRE0 Capacitor 0.1 uF 50V 1 AA
C4-5 VCEAB31VW106M Capacitor 10 uF 35V 2 AA
D1-4 VHD11ES1///-1 Diode (11ES1) 4 AB
D5-8 VHD1SS270A/-1 Diode (1SS270ATA) 4 AA
Q2 VS2SB1238//-3 Transistor (2SB1238) 1 AA
Q3 VSKRC243M//-3 Transistor (KRC243M) 1 AB
R2 VRS-B13AA511J Resistor 510 ohm 1W 1 AA
R3 VRD-B12HF391J Resistor 390 ohm 1/2W 1 AA
R4 VRD-B12EF270J Resistor 27 ohm 1/4W 1 AB
R5 VRD-B12EF472J Resistor 4.7k ohm 1/4W 1 AA
R6 VRD-B12EF332J Resistor 3.3k ohm 1/4W 1 AA
RY1 RRLY-A076DRE0 Relay (OMIF-S-124LM) 1 AK
RY2 RRLY-A113DRE0 Relay (DU24D1-1P(M)R) 1 AM
SP1 RALM-A014DRE0 Buzzer (PKM22EPT) 1 AG
T1 RTRNPA112DRE0 Transformer 1 AS
VRS1 RH-VZA032DRE0 Varistor (10G471K) 1 AE
3- 2 DPWBFC276WRKZ CPU unit 1 BH
3- 3 FPNLCB657WRKZ Control panel frame with key unit 1 BA
3- 3-1 FUNTKB123WREZ Key unit 1 AX
3- 4 PSHEPA672WRE0 LED sheet 1 AK
3- 5 LHLD-A185WRF0 LCD holder 1 AL
3- 6 XEPSD30P08XS0 Screw; 3mm x 8mm 4 AA
OVEN PARTS
4- 1 PCUSUA235WRP0 Cushion 1 AE
4- 2 PPACGA084WRF0 TTM packing 1 AF
4- 3 PHOK-A116WRFZ Latch hook 1 AH
4- 4 LBNDKA143WRW0 Capacitor holder 1 AC
4- 5 NFANJA043WRE0 Fan blade 1 AK
4- 6 PDUC-A790WRWZ Fan duct 1 AZ
Page 33
R-350F
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∆
∆
HOW TO ORDER REPLACEMENT PARTS
To have your order filled prompty and correctly, please furnish the following information.
1. MODEL NUMBER 3. PART NO.
2. REF. NO. 4. DESCRIPTION
∆
Note: The parts marked "∆" may cause undue microwave exposure.
The parts marked "*" are used in voltage more than 250V.
REF. NO. PART NO. DESCRIPTION Q'TY CODE
4- 7 FOVN-A508WRTZ Oven cavity 1 BF
4- 8 LANGFA196WRWZ Chassis support 1 AG
4- 9 PCUSGA529WRP0 Cushion 1 AC
4-10 LANG-A067WRPZ Magnetron duct 1 AG
4-11 LANG-A078WRWZ Barrier 1 AF
4-12 NCPL-A053WRFZ Coupling 1 AE
4-13 PCUSUA511WRP0 Cushion 1 AC
4-14 PCOVPA349WRE0 Waveguide cover 1 AE
4-15 PCUSGA339WRP0 Cushion 2 AG
4-16 PCUSUA527WRP0 Cushion 1 AE
4-17 PCUSUA512WRP0 Cushion 1 AB
4-18 PCUSUA474WRP0 Cushion 2 AC
4-19 LANG-A079WRWZ Air guide 1 AF
4-20 PCUSGA533WRP0 Cushion 1 AD
4-21 PCUSUA157WRP0 Cushion 1 AC
4-22 PCUSUA576WRPZ Cushion 1 AE
4-23 PCUSGA560WREZ Cushion 1 AB
4-24 PCUSUA186WRP0 Cushion 1 AC
4-25 PCUSUA190WRP0 Cushion 1 AC
4-26 PCUSUA191WRP0 Cushion 1 AC
4-27 PCUSUA212WRP0 Cushion 1 AB
4-28 PCUSUA461WRP0 Cushion 1 AB
DOOR PARTS
5- 1 FDORFA332WRT0 Door panel 1 BB
5- 2 PSHEPA382WRE0 Sealer film 1 AH
5- 3 GWAKPA790WRRZ Door frame 1 AZ
5- 4 HPNL-A745WRRZ Door screen 1 AR
5- 5 LSTPPA193WRFZ Latch head 1 AE
5- 6 MSPRTA187WRE0 Latch spring 1 AC
5- 7 XEPSD40P08000 Screw : 4mm x 8mm 6 AA
5- 8 PCUSUA461WRP0 Cushion 1 AB
5- 9 PCUSUA553WRPZ Cushion 2 AC
5-10 PCUSUA554WRPZ Cushion 2 AB
5-11 GCOVHA417WRFZ Choke cover 1 AG
MISCELLANEOUS
6- 1 FROLPA079WRK0 Turntable support 1 AQ
6- 2 NTNT-A079WRF0 Turntable tray 1 AR
6- 3 FW-VZB944WREZ Main wire harness 1 AG
6- 4 FW-VZB752WRE0 Switch harness 1 AG
6- 5 PZET-A012WRE0 Terminal insulator 1 AB
6- 6 TCAUHA214WRR0 Caution label 1 AC
6- 7 TSPCND252WRRZ Rating label 1 AF
6- 8 TINSEA949WRRZ Instruction book 1 AN
6- 9 LHLDWA011WRE0 Purse lock M 1 AB
6-10 TLABMA797WRRZ Menu label 1 AG
SCREWS,NUTS AND WASHERS
7- 1 XHPSD40P08K00 Screw : 4mm x 8mm 9 AA
7- 2 XHPSD30P06000 Screw : 3mm x 6mm 1 AA
7- 3 XHTSD40P08RV0 Screw : 4mm x 8mm 5 AA
7- 4 XOTSE40P08000 Screw : 4mm x 8mm 1 AA
7- 5 XOTSD40P12RV0 Screw : 4mm x 12mm 13 AA
7- 6 XOTSD40P08000 Screw : 4mm x 8mm 9 AA
7- 7 LX-CZ0052WRE0 Special screw 2 AA
7- 8 XHPSD40P08000 Screw : 4mm x 8mm 4 AA
∆
Page 34
R-350F
32
1
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
23456
123456
OVEN AND CABINET PARTS
4-15
7-5
7-5
7-5
7-5
2-1
4-13
4-18
4-14
4-2
4-22
6-4
7-6
1-12
7-1
7-5
1-7
1-8
4-10
4-16
1-6
7-1
2-3
7-5
7-5
7-6
7-6
4-28
7-6
1-9
4-6
1-3
1-2
1-10
1-15
7-7
4-9
7-2
1-13
7-3
4-8
4-4
4-15
4-18
7-6
7-6
1-4
4-7
4-11
7-4
7-8
7-6
4-19
4-12
6-10
6-2
6-1
4-1
7-6
7-1
1-11
4-20
1-5
7-1
4-5
2-2
7-1
4-3
7-3
1-1
1-1
7-1
1-14
7-3
7-3
7-6
1-5
4-24
4-27
6-6
4-26
4-17
7-1
4-21
4-23
4-25
Page 35
R-350F
33
1
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
23456
123456
3-2
3-1
3-5
3-4
3-6
3-3-1
3-6
3-3
6-7
Actual wire harness may be different from illustration.
6-3
6-5
6-9
5-11
5-1
5-3
5-4
5-7
5-7
5-7
5-6
5-7
5-2
5-5
5-10
5-10
5-9
5-9
5-8
6-4
CONTROL PANEL PARTS
MISCELLANEOUS
DOOR PARTS
Page 36
R-350F
34
1
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
23456
123456
2002SHARP CORP. (7S0.CD_E)
PACKING AND ACCESSORIES
DOOR PROTECTION SHEET
SPADPA204WRE0
TOP PAD ASSEMBLY
FPADBA428WRKZ
PLASTIC BAG
SSAKHA034WRE0
Not replaceable items.
PACKING CASE
SPAKCD774WREZ
BOTTOM PAD ASSEMBLY
FPADBA491WRKZ
6- 2 TURNTABLE TRAY
6- 8 INSTRUCTION BOOK
& PRINTING MATTER
6- 1 TURNTABLE SUPPORT
TRAY PACK
SPADFA451WRE0
INTO THE
OVEN CAVITY
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