Sharp R-350D Service Manual

Page 1
R-350D
SHARP CORPORATION
SERVICE MANUAL
S7005R350DPJ/
MICROWAVE OVEN
MODEL R-350D
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 ...................................................................................................................................................... 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
DINNER PLATE
PASTA MEAL
FROZEN DINNER
CASSEROLE
SOUP
PIE
PIZZA
POWER LEVEL
LESS MORE
STOP CLEAR
INSTANT COOK
START
CLOCK
TIMER
EASY
DEFROST
EXPRESS
DEFROST
BEVERAGE
MEAT
VEGETABLES
RICE/
PASTA
CONVENIENCE MEALS
REHEAT MENU
INFORMATION COOK
1234 6789
5 0
DEFROST COOK
HELP
Info Display
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R-350D
Page 3
R-350D
1
SERVICE MANUAL
MICROWAVE OVEN
R-350D
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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R-350D
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ITEM DESCRIPTION
Power Requirements 230 - 240 Volts
50 Hertz
Single phase, 3 wire earthed Power Consumption 1.6kW Power Output 1100 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
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
INSTANT ACTION pads
EXPRESS DEFROST pad
EASY DEFROST pad
NUMBER pads
POWER LEVEL pad
TIMER/CLOCK pad
STOP/CLEAR pad
INSTANT COOK/START pad Set Weight Approx. 17 kg
PRODUCT SPECIFICA TIONS
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-350D
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APPEARANCE VIEW
1. Ventilation openings
2. Oven lamp
3. Door hinges
4. Door safety latches
5. See through door
6. Door seals and sealing surfaces
7. Coupling
8. Door handle
9. Touch control panel
10.Digital readout
11.Waveguide cover
12.Power supply cord
13.Rating label
14.Turntable tray
15.Turntable support
TOUCH CONTROL PANEL
NOTE: The directed feature is disabled after three minutes when the oven is not in use. This feature is automatically enabled when the door is opened and closed or the STOP/ CLEAR pad is pressed.
14
15
12
1
8
4
3
6
9
10
5
7
2
11
13
DINNER
PLATE
PASTA MEAL
FROZEN DINNER
CASSEROLE
SOUP
PIZZA
POWER
LEVEL
LESS MORE
STOP
CLEAR
INSTANT COOK
START
CLOCK
TIMER
EASY
DEFROST
EXPRESS
DEFROST
BEVERAGE
PIE
MEAT
VEGETABLES
RICE/
PASTA
CONVENIENCE MEALS
REHEAT MENU
INFORMATION COOK
12345 6789
0
STOP/CLEAR PAD Press to clear during programming. Press once to stop operation of oven during cooking; press twice to can­cel cooking programme.
POWER LEVEL PAD Press to select microwave power setting. If not pressed, HIGH is au­tomatically selected.
INSTANT COOK/START PAD Press to start the oven after setting programmes. Press once to cook for 1 minute on HIGH or increase in 1 minute increments each time this pad is pressed during cooking. (See note.)
HELP PAD Press to select auto start, child lock or demonstration modes. Press to display preset menu cooking information.
CONVENIENCE MEALS PADS Press to select Convenience Meals menus.
INFORMATION COOK PADS Press to select information Cook mode.
EASY DEFROST PAD Press to select Easy Defrost menu.
REHEAT MENU PADS Press to select a reheat menu.
MORE( ), LESS ( ) PADS Press to increase/ decrease the time in one minute increments dur­ing cooking or to after the cooking result for automatic operations.
NUMBER PADS Press to enter cooking times, clock time, weight or quantity of food.
EXPRESS DEFROST PAD Press to select Express Defrost menu.
TIMER PAD Press to set Timer.
CLOCK PAD Press to set Clock.
Indicator
Display
DEFROST COOK
HELP
Info Display
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R-350D
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OPERATION SEQUENCE
OFF CONDITION
Closing the door activates all door interlock switches (1st. latch switch, 2nd. latch switch and stop switch).
IMPORTANT When the oven door is closed, the monitor switch contacts (COM-NC) must be open. When the microwave oven is plugged in a wall outlet, rated voltage is supplied to the noise filter and the control unit.
Figure O-1 on page 25
1. The display shows "SHARP MICRO-WAVE 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 channeled 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. latch switch COM-NO Closed Open Monitor switch COM-NC Open Closed Stop switch COM-NO Closed Open
The circuits to the power transformer, fan motor and turntable motor are cut off when the 1st. latch switch, 2nd. latch switch, and stop switch are made open. The oven lamp remains on even if the oven door is opened after the cooking cycle has been interrupted, because
the relay 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 and 2nd. latch switches.
6-1 When the oven door is opened during or after the
cycle of a cooking program, the 1st. latch switch, 2nd. latch switch and stop 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, 2nd. latch switch and stop switch are closed.
6-3. When the oven door is opened and the contacts of
the1st. latch switch, 2nd. latch switch remain closed. The fuse M10A 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, 230-240 volts A.C. power 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. 2 seconds are needed for heating up the magnetron filament.
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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R-350D
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FUNCTION OF IMPORTANT COMPONENTS
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 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 vanes surrounding the magnetron and cools the magnetron. This air is channeled through the oven cavity to remove steam and vapors 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, 2ND. LATCH SWITCH AND STOP SWITCH
1. When the oven door is closed, the contacts (COM-NO) must be closed.
2. When the oven door is opened, the contacts (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. latch switch fail to open, the fuse M10A blows simultaneously with closing the contacts (COM-NC) of the monitor switch.
CAUTION: BEFORE REPLACING A BLOWN FUSE
M10A TEST THE 1ST. LATCH SWITCH, 2ND. LATCH SWITCH MONITOR SWITCH AND MONITOR RESISTOR FOR PROPER OP­ERATION.
MONITOR RESISTOR 0.8Ω 20W
The monitor resistor prevents the fuse M10A bursting when the fuse M10A blows due to the operation of the monitor switch.
HIGH VOLTAGE FUSE
The high voltage fuse blows when the high voltage rectifier or magnetron is shorted.
FUSE M10A
1. The fuse M10A blows when the contacts (COM-NO) of the 1st. 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 short­circuited, this fuse M10A blows to prevent an electric shock or fire hazard.
Latch Hook
Stop Switch
2nd. Latch
Switch Latch Heads
Door
Monitor Switch
1st. Latch
Switch
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R-350D
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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 M10A in the 1st. latch switch - 2nd. latch switch - monitor switch
- monitor resistor circuit, check the 1st. latch switch, 2nd. latch switch, monitor switch and monitor resistor before replac­ing the fuse M10A.
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R-350D
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MAGNETRON
POWER TRANSFORMER
H.V. RECTIFIER ASSEMBLY
HIGH VOLTAGE CAPACITOR
1ST. LATCH SWITCH
2ND. LATCH SWITCH
STOP SWITCH
MONITOR SWITCH
MONITOR RESISTOR
THERMAL CUT-OUT 95˚C /125˚C
FAN MOTOR
TURNTABLE MOTOR
FUSE M10A
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 M10A 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
CK = Check / RE = Replace
ABCDEEEEGFH HILMNO
RECK CK RE CK CKCKCK CK
JK
CONDITION
PROBLEM
POSSIBLE CAUSE
AND
DEFECTIVE PARTS
ON CONDITION
OFF CONDITION
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R-350D
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
A MAGNETRON TEST
NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPERATION.
CARRY OUT 3D 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 circuit filament to anode condition, connect ohmmeter between one of the filament
terminals and the case of the magnetron (ground). This test should be indicated an infinite resistance. If a low or zero resistance reading is obtained then the magnetron should be replaced.
MICROWAVE OUTPUT POWER (1 litre water load)
The following test procedure should be carried out with the 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)
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.............................. 38 sec. Mass of container (mc) ......................... 330 g
T2............................ Final Temperature P = 110 x T + 0.55 x mc (T2-T0)/38
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 + 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.
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R-350D
9
Room temperature .................. To = 21˚C Initial temperature................. T1 = 11°C
Temperature after (38 + 2) = 40 sec. ................................................................ T2 = 21°C
Temperature difference Cold-Warm .............................................................. ∆T1 = 10°C
Measured output power
The equation is “P = 110 x T” ........................................... P = 110 x 10°C = 1100 Watts
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
1000g
1000g
1000g
T1˚C
T2˚C
Heat up for 40 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
b. Secondary winding ...............approx. 87
c. Filament winding...................less than 1
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 k 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
JUDGMENT: The measured output power should be at least ± 15 % of the rated output power.
CAUTION: 1°C CORRESPONDS TO 110 WATTS REPEAT MEASUREMENT IF THE POWER IS
INSUFFICIENT.
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R-350D
10
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.
G MONITOR RESISTOR 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 10M
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 M because of its internal 10M
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 temperature fuse or thermal cut-out. Then using an
ohmmeter, make a continuity test across the two terminals as described in the table below. CARRY OUT 4R CHECKS.
Table: Temperature fuse and Thermal cut-out Test
Temperature of "ON" condition Temperature of "OFF" condition Indication ofohmmeter
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 temperature fuse or 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 TEMPERATURE FUSE AND THERMAL CUT-OUT TEST
Page 13
R-350D
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT 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.
Table: Resistance of Motor
Motors Resistance Fan motor Approximately 390 Turntable motor Approximately 12 k
If incorrect readings are obtained, replace the motor. CARRY OUT 4R CHECKS
H MOTOR WINDING TEST
CARRY OUT 3D CHECKS.
1. If the fuse M10A 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 M10A is blown when the door is opened, check the 1st. latch switch, 2nd. latch switch, monitor switch and monitor resistor. If the fuse M10A is blown by incorrect door switching replace the defective switch(s) and the fuse M10A.
CARRY OUT 4R CHECKS. CAUTION: ONLY REPLACE FUSE M10A WITH THE CORRECT VALUE REPLACEMENT
I BLOWN FUSE M10A
J 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.
N
L
Cx
L
L
Cy
WHT
RED
L (min) Cx ± 20% Cy ± 20% 600µH 0.068µF 0.0022µF
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
K HIGH VOLTAGE FUSE TEST
If incorrect readings are obtained, replace the monitor resistor. CARRY OUT 4R CHECKS.
Page 14
R-350D
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
M 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 door sensing switch (stop switch) operates properly; that is the contacts are closed when the door is closed and open when the door is open. If the door sensing switch (stop switch) is good, disconnect the flat ribbon cable that connects the key unit to the control unit and make sure the door sensing switch is closed (either close the door or short the door sensing 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.
L TOUCH CONTROL PANEL ASSEMBLY TEST
The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore, unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter and ohmmeter. In this service manual, the touch control panel assembly is 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.
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 M) 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.
5
4
3
21
09876
BEVERAGE
POWER
LEVEL
FROZEN
DINNER
MEAT CLOCK TIMER
HELP
LESS
DINNER
PLATE
RICE/
PASTA
PASTA
MEAL
EASY
DEFROST
EXPRESS
DEFROST
STOP
CLEAR
VEGETABLES
INSTANT
COOK
START
G 8
G 9
G10
G11
G12
G13
G14
G 7 G 6 G 5 G 4 G 3 G 2 G 1
SOUP
CASSEROLE
PIE PIZZA
MORE
Page 15
R-350D
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 RELAY TEST
O PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD
(PWB) IS OPEN
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.
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-350D
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 P10-P17. When a key pad is touched, a signal is completed through the key unit and passed back to the LSI through AN11, AN10, AN9, P42, P41 and AN8 to perform the function that was requested.
Control Unit
Control unit consists of LSI, ACL circuit, indicator circuit, power source circuit, relay circuit, buzzer circuit, synchro­nizing signal circuit and back light circuit.
1) ACL
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) Door Sensing 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-LD19).
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15
1 AN10 IN Signal coming from touch key.
When either G10 line on key matrix is touched, a corresponding signal out of P10 - P17 will be input into AN10. When no key is touched, the signal is held at "H" level.
2 AN11 IN Signal similar to AN10.
When either G9 line on key matrix is touched, a corresponding signal will be input into
AN11. 3 AVSS IN Connected to VC. 4 P10 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AN9, AN10, AN11, P41 and
P42 terminal while one of G8 line keys on key matrix is touched. 5 P11 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AN8, AN9, AN10, AN11, P41
and P42 terminal while one of G7 line keys on key matrix is touched. 6 P12 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AN9, AN10, AN11, P41 and
P42 terminal while one of G6 line keys on key matrix is touched. 7 P13 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AN9, AN10, AN11, P41 and
P42 terminal while one of G5 line keys on key matrix is touched. 8 P14 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AN9, AN10, AN11, P41 and
P42 terminal while one of G4 line keys on key matrix is touched. 9 P15 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AN9, AN10, AN11, P41 and
P42 terminal while one of G3 line keys on key matrix is touched.
10 P16 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AN9, AN10, AN11, P41 and
P42 terminal while one of G2 line keys on key matrix is touched.
11 P17 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AN9, AN10, AN11, P41 and
P42 terminal while one of G1 line keys on key matrix is touched.
12 X1 IN Connected to GND. 13 X2 OUT Terminal not used. 14 VSS IN Power source voltage: -5.0V.
VC voltage of power source circuit input.
15 OSC2 OUT Internal clock oscillation frequency control output.
Output to control oscillation input of OSC2.
16 OSC1 IN Internal clock oscillation frequency input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to OSC1 terminal.
17 TEST IN Connected to VC. 18 RES 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.
19 P20 OUT Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
20 P21 OUT Terminal not used. 21 P22
IN/OUT
Terminal not used.
22 P23 OUT Terminal not used.
LSI(IXA049DR)
The I/O signal of the LSI(IXA049DR) is detailed in the following table.
Pin No. Signal I/O Description
A
B
0.12 sec.
2.4 sec.
H : GND
L : -5V H : GND
L : -5V
Page 18
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16
23 P24 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.
24 P25 OUT Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2). The signals holds "L" level during microwave cooking 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.
(ON and OFF times for other power level.) 25-26 P26-P27 OUT Terminal not used. 27-34 P30-P37 OUT Terminal not used.
35 CVCC IN Connected to GND. 36 VSS IN Power source voltage: -5.0V.
The power source voltage to the LSI is input to VSS terminal. Connected to VC. 37-38 V3-V2 IN Terminal not used. 39-40 V1-V0 IN Power source voltage input terminal.
Standard voltage for LCD. Connected to GND.
41 VCC IN Power source voltage: GND (0V).
The power source voltage to drive the LSI is input to VCC terminal. 42-45
COM4-COM1
OUT Terminal not used.
46-65
SEG1-SEG20
OUT Terminal not used. 66-79 P74-P91 OUT Data output terminal to LCD driver IC3. 80-85
SEG35-SEG40
OUT Terminal not used.
86 P40 OUT Terminal not used. 87 P41 IN Signal similar to AN10.
When either G13 line on key matrix is touched, a corresponding signal will be input into P41.
88 P42 IN Signal similar to AN10.
When either G12 line on key matrix is touched, a corresponding signal will be input into P42.
89 IRQ0 IN Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of LSI.
90 AVCC IN A/D converter power source voltage.
The power source voltage to drive the A/D converter in the LSI. Connected to GND.
91-92 AN0-AN1 IN Connected to GND through resistor.
93 AN2 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).
94 AN3 IN Connected to VC through resistor.
95-98 AN4-AN7 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.
99 AN8 IN Input terminal to judge the model.
The signal out of P11 will be input into AN8 through G7 line on key matrix. The LSI will judge the model by this signal.
100 AN9 IN Signal similar to AN10.
When either G11 line on key matrix is touched, a corresponding signal will be input into AN9.
Pin No. Signal I/O Description
20.0 msec.
During cooking
H : GND
L : -5V
P-HI
H : GND
L : -5V H : GND
L : -5V
P-70
ON
ON
OFF
OFF OFF
24 sec.
8 sec.
20.0 msec.
H : GND
L : -5V
Page 19
R-350D
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
TOUCH CONTROL PANEL SERVICING
apart from the oven proper; in this case you must short both ends of the door sensing switch (on PWB) of the touch control panel with a jumper, which brings about an operational state that is equivalent to the oven door being closed. As for the sensor-related controls of the touch control panel, checking them is possible if dummy resistor(s) with resistance equal to that of the controls are used.
(2) Servicing the touch control panel with power supply
from an external power source:
Disconnect the touch control panel completely from the oven proper, and short both ends of the door sensing switch (on PWB) of the touch control panel, which brings about an operational state that is equivalent to the oven door being closed. Connect an external power source to the power input terminal of the touch control panel, then it is possible to check and repair the controls of the touch control panel it is also possible to check the 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.
approx. 1M ohm
E
C
B
E
C
B
Transistor 2SB1238
Transistor KRC243M
Page 20
R-350D
18
HIGH VOLTAGE RECTIFIER, HIGH VOLTAGE FUSE AND HIGH VOLTAGE CAPACITOR REMOVAL
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, Open button.
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. Remove four(4) screws from rear and one (1) screw along the right side edge of case.
3. Slide the entire case back out about 1 inch(3 cm) to free
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
it from retaining clips on the cavity face plate.
4. Lift entire case from the unit. CAUTION: DISCONNECT OVEN FROM POWER SUP-
PLY BEFORE REMOVING OUTER CASE.
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
Page 21
R-350D
19
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 one (1) 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 five (5) 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 five (5) 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
RECEPTACLE
COVERS
Terminal insulator
Flat type screw driver
Terminal
Push
Pull down
1
2
Lever
Positive lock
®
connector
CONTROL PANEL ASSEMBLY REMOVAL
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
Page 22
R-350D
20
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.
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.
1. CARRY OUT 3D CHECKS.
2. Bend the tab of the partition angle holding the lamp socket.
3. Lift up the oven lamp socket.
4. Pull the wire leads from the oven lamp socket by pushing the terminal hole of the oven lamp socket with the small flat type screw driver.
5. Now, the oven lamp socket is free.
OVEN LAMP AND LAMP SOCKET REMOVAL
Figure C-3. Oven lamp socket
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.
Figure C-2. CPU unit
Printed wiring board
of CPU unit
Liquid Crystal
Display (LCD)
Ribbon cable
Oven lamp socket
Terminal
Wire lead
Terminal hole
Flat type small screw driver
Page 23
R-350D
21
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.
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 erath 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. LATCH SWITCH, STOP 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.
Re-install
1. Re-install each switch in its place. The 1st. latch and
monitor switches are in the lower position and the 2nd. latch switch and stop switch are 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.
Figure C-4 (a). Power Supply Cord Replacement Figure C-4 (b) Power Supply Cord Replacement
Power Supply Cord
Oven Cavity Back Plate
Square Hole
Moulding Cord Stopper
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
Page 24
R-350D
22
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
1ST. LATCH SWITCH, 2ND. LATCH SWITCH, STOP SWITCH AND MONITOR SWITCH ADJUSTMENT
REMOVAL
1. Disconnect the power supply cord.
2. Push the 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.
Figure C-6. Door Disassembly
9. Remove the four (4) screws holding the door panel to the door frame.
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.
DOOR REPLACEMENT
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. latch switch,
stop 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 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.
Latch Hook
Stop Switch
2nd. Latch
Switch Latch Heads
Door
Monitor Switch
1st. Latch
Switch
Choke Cover
Door Frame
Putty Knife
Page 25
R-350D
23
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
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.
Sealer film
Backing film
Adhesive tape
Pin
Pin
Upper Oven Hinge
Upper Oven Hinge
Lower Oven
Hinge
Lower Oven Hinge
Choke Cover
Page 26
R-350D
24
MICROW A VE MEASUREMENT
After adjustment of door latch switches, monitor switch and door are completed individually or collectively, the following leakage test must be performed with a survey instrument and it must be confirmed that the result meets the requirements of the performance standard for micro­wave oven.
REQUIREMENT
The safety switch must prevent microwave radiation emis­sion in excess of 5mW/cm2 at any point 5cm or more from external surface of the oven.
PREPARATION FOR TESTING:
Before beginning the actual test for leakage, proceed as follows;
1. Make sure that the test instrument is operating normally as specified in its instruction booklet. Important: Survey instruments that comply with the requirement for instrumentations as prescribed by the performance standard for microwave ovens must be used for testing.
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-350D
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
CAPACITOR
1.07µ AC2300V
TURNTABLE MOTOR
FAN MOTOR
OVEN LAMP
STOP 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)
RY-2
2ND. LATCH SWITCH
MONITOR
RESISTOR
0.8/20W
EARTH
BLU
BRN
G-Y
FUSE M10A
N
L
LINE CROSS CAPACITOR
0.068µ/AC250V
NOISE SUPPRESSION COIL
LINE BYPASS
CAPACITOR
0.0022µ/AC250V
LINE BYPASS
CAPACITOR
0.0022µ/AC250V
NOISE FILTER
230-240V 50Hz
POWER TRANSFORMER
MAGNETRON
H.V. RECTIFIER
H. V. FUSE
0.75A
CAPACITOR
1.07µ AC2300V
TURNTABLE MOTOR
FAN MOTOR
OVEN LAMP
STOP SWITCH
MONITOR SWITCH
CONTROL UNIT
THERMAL CUT-OUT 95˚C (MG)
1ST. LATCH SWITCH
B1
B2
A2
OL
FM
TTM
N.O.
N.O.
RY-1
COM.
COM.
A1
THERMAL CUT-OUT 125˚C (OVEN)
NOISE FILTER
RY-2
2ND. LATCH SWITCH
MONITOR
RESISTOR
0.8/20W
EARTH
BLU
BRN
230-240V 50Hz
G-Y
FUSE M10A
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-350D
26
6
45
1
2
3
6
45
1
2
3
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
Figure S-1. Pictorial Diagram
HIGH VOLTAGE
CAPACITOR
HIGH VOLTAGE
FUSE
H.V.
RECTIFIER
HIGH VOLTAGE COMPONENTS
OVEN LAMP
AND SOCKET
MAGNETRON
TURNTABLE
MOTOR
POWER
TRANSFORMER
GRY
RED
GRY
BLK
WHT
YLW
WHT
BLK
RED
ORG
Black Mark
WHT
WHT
RED
WHT
WHT
THERMAL
CUT-OUT (MG)
NOISE FILTER
FAN MOTOR
MONITOR
RESISTOR
THERMAL
CUT-OUT (OVEN)
BLK
ORG
RED
GRY
WHT
BLK
BLU
BRN
POWER
SUPPLY
CORD
EARTH
NEUTRAL
LIVE
G
/
Y
N
L
WHT
RED
NOTE:
Neutral (WHT) wire must
be connected to the
terminal with black mark
on the oven light socket.
COM.
MONITOR
SWITCH
COM.
COM.
N.O.
N.O.
N.C.
STOP
SWITCH
2ND. LATCH
SWITCH
1ST. LATCH
SWITCH
COM.
NO
RED
ORG
YLW
BLK
YLW
RED
GRN
GRN
GRY
WHT
BLK
RED
GRY
WHT
2
1
GRY
WHT
YLW
ORG
RY2
RY1
SP1
IC1
SECONDARY
INTERLOCK
RELAY
CN-A
CN-B
CN-G
CN-C
CN-C
CN-A
T1
1
2
1
2
CONTROL UNIT
(CPU UNIT)
(POWER UNIT)
(Lower)
(Upper)
(Oven side)
(Cabinet side)
GRN
RED 2
1
CN-B
GRN
GRN
Page 29
R-350D
27
6
45
1
2
3
6
45
1
2
3
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
Figure S-2. Power unit Circuit
+ –
+ –
+ –
A 1
CN-A
R4 27
D5
T1
ab
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 1/2wR2 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
STOP SWITCH
OVEN LAMP TURNTABLE MOTOR FAN MOTOR
AC
AC
MICRO
STOP 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-350D
28
6
45
1
2
3
6
45
1
2
3
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
Figure S-3. CPU Unit Circuit
+
C-2
C-3
C-10
C-9
C-1
C-5
C-6
C-7
C-12
C-8
G 9
G10
G11
G12
G13
G14
G 8
54321
0
MEAT
CLOCK
HELP
FROZEN
DINNER
STOP
CLEAR
VEGETABLES
POWER
LEVEL
LESS
PIZZA
PASTA
MEAL
DINNER
PLATE
TIMER SOUP
PIE
BEVERAGE
RICE/
PASTA
EASY
DEFROST
EXPRESS
DEFROST
CASSEROLE
9876
G 7 G 6 G 5 G 4 G 3 G 2 G 1
C-11
C-4
INT
GND
CPU UNIT
VC
LED
VR
VA
MICRO
DOOR
(BROWNER)
NOTE
NC
: IF NOT SPECIFIED, 1/10W ± 5%
BUZZER
OVEN LAMP
TURNTABLE
MOTOR
FAN MOTOR
IC1
IXA049DR
Indicator Circuit
( See Fig. S-4 )
C10 47µ/16v
C11 0.1µ/50v
C40
0.01µ/25v
C65 330pF/50v
C64 330pF/50v
C63 330pF/50v
C62 330pF/50v
C61 330pF/50v
C60 330pF/50v
C12
0.1µ
/50v
C110
4.7k
C13
0.01µ
/25v
C92 4.7k
C14
0.01µ/25v
C20
0.1µ/50v
ZD10
UDZ4.3B
R12
15k
R11
15k
(J10)
(J11)
4.7k
(J13)
4.7k
(J15)
4.7k
(J17)
4.7k
(J12)
(J14)
(J16)
Q30
DTA143EKA
Q11
DTA143EKA
Q20
DTA143EKA
Q21 DTA123JKA
D20 1SS355
D41 1SS355
LD10
LD19 LD18 LD17
LD11 LD12
LD16 LD15 LD14 LD13
CF1
CST4.00MGW
R78 270k R79 270k
R77 270k
R76 270k
R75 270k
R74 270k
R41 15k
130
31
50
5180
81
100
R68 15k
R69 15k
R70 15k
R71 15k
R72 15k
R73 15k
C93 4.7k
Q10
2SA1037AK
R10 1k
R80
1M
R66 15k
R65 15k
R64 15k
R63 15k
R62 15k
R61 15k
R60 15k
R67 15k
R40 4.7k
SEG35
AN10
AN11
AVSS
P10
P11
P12
P13
P14
P15
P16
P17
X 1
X 2
VSS
OSC2
OSC1
TEST
RES
P20
P21
P22
P23
P24
P25
P26
P27
P30
P31
P32
P33
P91
P90
P87
P86
P85
P84
P83
P76
P75
P74
SEG20
SEG5
SEG36
SEG37
SEG38
SEG39
SEG40
P40
P41
P42
IRQ0
AVCC
AN0
AN1
AN2
AN3
AN4
AN5
AN6
AN7
AN8
AN9
SEG4
SEG3
SEG2
SEG1
COM1
COM2
COM3
COM4
VCC
V 0
V 1
V 2
V 3
VSS
CVCC
P37
P36
P35
P34
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
SEG6
P82
P81
P80
P77
INSTANT
COOK
START
KEY UNIT
MORE
Page 31
R-350D
29
6
45
1
2
3
6
45
1
2
3
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
VC
GND
IC1 P91
OSC4
VC1
VC2
VC3
VC4
VC5
CF
CE
CD
CC
CB
CA
COM8
COM9
COM10
COM11
COM12
COM13
COM14
COM15
COM16
SEG39
SEG38
SEG37
SEG36
SEG35
OSC3
VD1
OSC2
OSC1
VSS
BZ
COM0
COM1
COM2
COM3
COM4
COM5
COM6
COM7
SEG0
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG10
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
VDD
NC
NC
RESET
TEST
VREF
R03
R02
R01
R00
P13
P12
P11
P10
P03
P02
P01
P00
K03
K02
K01
K00
NCNCNC
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
SEG24
SEG25
SEG26
SEG27
SEG28
SEG29
SEG30
SEG31
SEG32
SEG33
SEG34
SEG9
1
100
76
7551
25
IC3
IXA044DR
26
50
R134 15k
R132 33k R133 510k
R120 4.7k
R121 4.7k
R122 4.7k
R123 4.7k
R124 4.7k
R125 4.7k
R126 4.7k
R127 4.7k
R128 4.7k
R129 4.7k
R130 4.7k
R131 4.7k
C124 0.1µ/50v
C120 0.1µ/50v
C121 0.1µ/50v
C122 0.1µ/50v
C123 0.1µ/50v
C126
0.1µ/50v
C125
0.1µ/50v
C127
0.1µ/50v
C129
0.1µ/50v
C128
0.1µ/50v
IC1 P90
IC1 P86
IC1 P85
IC1 P84
IC1 P83
IC1 P82
IC1 P81
IC1 P80
IC1 P77
IC1 P76
IC1 P75
IC1 P74
IC1 P87
NOTE
: IF NOT SPECIFIED, 1/10W ± 5%
DEFROST COOK HELP
LIQUID CRYSTAL DISPLAY
Figure S-4. Indicator Circuit
Page 32
R-350D
30
6
45
1
2
3
6
45
1
2
3
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
Figure S-5. Printed Wiring Board
DIP
F
SW
R3
SP1
R2
E
B
R1
C4
C2
C5
RY2
RY1
VRS1
P
S
T1
RY3(CN - D)
D6
D1
D4
D8
D2
D3
(D20)
D5
R4
Q2
Q3
B
B
E
E
R6
D9 D7
(J2)
(J1)
(D10)
R5
ZD1
1
2
C3
C1
CN - C
CN - A
(CN - B)
SH - B SH - A
(RED) (GREEN)
1
1
1
1
2
3
2
12
Page 33
R-350D
31
* *
*
* *
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-MA137WRE0
1st. latch switch/ 2nd. latch switch/ stop switch
3AH 1- 2 FPWBFA329WRK0 Noise filter 1 AS 1- 3 QSW-MA138WRE0 Monitor switch 1 AH 1- 4 RTHM-A116WRE0 Thermal cut-out 125˚C 1 AK
1- 5 QACCAA047WRE0 Power supply cord 1 AP 1- 6 FH-DZA088WRK0 High voltage rectifier assembly 1 AP 1- 7 RC-QZA278WRZZ High voltage capacitor 1 AT 1- 8 RV-MZA294WRE0 Magnetron 1 BL 1- 9 RMOTEA340WRE0 Fan motor 1 AX
1-10 QSOCLA024WRE0 Oven lamp socket 1 AH 1-10 QSOCLA022WRE0 Oven lamp socket (Interchangeable) 1 AG 1-11 RLMPTA069WRE0 Oven lamp 1 AK 1-12 RMOTDA173WRE0 Turntable motor 1 AX 1-12 RMOTDA169WRE0 Turntable motor (Interchangeable) 1 AW
1-13 RTHM-A117WRE0 Thermal cut-out 95˚C 1 AK 1-14 RTRN-A610WRZZ Power transformer 1 BL 1-15 QFS-IA002WRE0 High voltage fuse 1 AQ 1-16 RR-WZA022WRE0 Monitor resistor 0.8 ohm 20W 1 AK
1-17 QFS-CQ001YBE0 Fuse M10A 1 AE
CABINET PARTS
2- 1 GCABUA690WRP0 Outer case cabinet 1 AZ 2- 2 GDAI-A316WRW0 Bottom plate 1 AX 2- 3 GLEGPA074WRE0 Foot 2 AC
2- 4 GLEGPA077WRF0 Leg 1 AH
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 DPWBFC083WRKZ CPU unit 1 BG 3- 3 FPNLCB516WRKZ Control panel frame with key unit 1 AZ
3- 3-1 FUNTKB012WREZ Key unit 1 AV 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 PDUC-A724WRF0 Air separater 1 AU 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-A728WRW0 Fan duct 1 AT 4- 7 FOVN-A461WRTZ Oven cavity 1 BD 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
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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
∆ ∆ ∆
4-16 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 PCUSUA212WRP0 Cushion 1 AB 4-23 PCUSUA461WRP0 Cushion 1 AB
DOOR PARTS
5- 1 FDORFA332WRT0 Door panel 1 BB 5- 2 PSHEPA382WRE0 Sealer film 1 AH 5- 3 GWAKPA715WRRZ Door frame 1 AX 5- 4 HPNL-A745WRRZ Door screen 1 AR 5- 5 LSTPPA193WRFZ Latch head 1 AE 5- 6 MSPRTA187WRE0 Latch spring 1 AC 5- 7 XCPSD40P08000 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
AHMISCELLANEOUS
6- 1 FROLPA079WRK0 Turntable support 1 AQ 6- 2 NTNT-A079WRE0 Turntable tray 1 AR 6- 3 FW-VZB792WREZ Main wire harness 1 AT 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 TSPCNC920WRRZ Rating label 1 AB 6- 8 TINSEA855WRRZ Instruction book 1 AK 6- 9 LHLDWA011WRE0 Purse lock M 1 AB
SCREWS,NUTS AND WASHERS
7- 1 XHPSD40P08K00 Screw : 4mm x 8mm 12 AA 7- 2 XHPSD30P06000 Screw : 3mm x 6mm 1 AA 7- 3 XHTSD40P08RV0 Screw : 4mm x 8mm 7 AA 7- 4 XOTSE40P08000 Screw : 4mm x 8mm 1 AA 7- 5 XOTSD40P12RV0 Screw : 4mm x 12mm 5 AA 7- 6 XOTSD40P12000 Screw : 4mm x 12mm 19 AA 7- 7 LX-CZ0052WRE0 Special screw 2 AA
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6
45
1
2
3
6
45
1
2
3
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
OVEN AND CABINET PARTS
4-15
7-5
7-5
7-5
7-5
1-10
2-1
4-13
4-18
1-11
4-14
4-2
6-4
7-6
1-12
7-1
7-5
1-7
1-8
4-10
4-16
1-6
7-1
2-3
2-3
7-6
7-6
7-6
4-23
7-6
1-9
4-6
1-3
1-2
1-17
1-15
7-7
7-6
4-9
1-16
7-2
1-13
7-3
4-8
4-4
4-15
7-6
7-6
1-4
4-7
4-11
7-4
7-1
4-18
7-6
4-19
4-22
4-12
6-2
6-1
4-1
7-6
2-4
4-20
7-3
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
6-6
4-17
7-1
4-21
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34
6
45
1
2
3
6
45
1
2
3
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
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
3-2
3-1
3-5
3-4
3-6
3-3-1
3-6
3-3
6-7
2000SHARP CORP. (7S0.730E) Printed in Australia
CONTROL PANEL PARTS
MISCELLANEOUS
DOOR PARTS
PACKING AND ACCESSORIES
DOOR PROTECTION SHEET SPADPA204WRE0
TOP PAD ASSEMBLY FPADBA428WRKZ
PLASTIC BAG SSAKHA068WREZ
Not replaceable items.
PACKING CASE SPAKCD422WREZ
BOTTOM PAD ASSEMBLY FPADBA429WRKZ
6- 2 TURNTABLE TRAY
6- 8 INSTRUCTION BOOK & PRINTING MATTER
6- 1 TURNTABLE SUPPORT
TRAY PACK SPADFA451WRE0
INTO THE OVEN CAVITY
PROTECTION SHEET SPADPA602WREZ
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