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R-244M - 1

SHARP CORPORATION

SERVICE MANUAL

S40189R244M//

R

MICROWAVE OVEN

MODELS

R-244(W)M
R-244(G)M
R-244(B)M
R-244(SL)M

SERVICING .............................................................................................................................................  2
CAUTION/WARNING ...............................................................................................................................  3
PRODUCT SPECIFICATIONS ................................................................................................................  3
APPEARANCE VIEW................................................................................................................................ .4
OPERATION SEQUENCE ........................................................................................................................ 5
OUTPUT POWER TEST PROCEDURE ................................................................................................... 6
TEST PROCEDURES................................................................................................................................ 7
TOUCH CONTROL ASSEMBLY .............................................................................................................. 9
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................... 13
MICROWAVE MEASUREMENT PROCEDURE...................................................................................... 16
SCHEMATIC DIAGRAMS.........................................................................................................................17
PICTORIAL DIAGRAM ..........................................................................................................................  18
CONTROL PANEL CIRCUIT .................................................................................................................  19
SWITCH UNIT CIRCUIT DIAGRAM ....................................................................................................... 20
PRINTED WIRING BOARD OF CONTROL PANEL DIAGRAM ............................................................. 21
PRINTED WIRING BOARD OF SWITCH UNIT DIAGRAM .................................................................... 22
PARTS LIST ...........................................................................................................................................  23
EXPLODED DIAGRAM OF OVEN .......................................................................................................... 26
CONTROL PANEL/DOOR PARTS ......................................................................................................... 27
PACKING AND ACCESSORIES ...........................................................................................................  28

TABLE OF CONTENTS

Page

In interests of user-safety the oven should be restored to its
original condition and only parts identical to those specified
should be used.

1
2
3
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Summary of Contents for R-244(B)M

Page 1: ...ADJUSTMENT PROCEDURE 13 MICROWAVE MEASUREMENT PROCEDURE 16 SCHEMATIC DIAGRAMS 17 PICTORIAL DIAGRAM 18 CONTROL PANEL CIRCUIT 19 SWITCH UNIT CIRCUIT DIAGRAM 20 PRINTED WIRING BOARD OF CONTROL PANEL DIAGRAM 21 PRINTED WIRING BOARD OF SWITCH UNIT DIAGRAM 22 PARTS LIST 23 EXPLODED DIAGRAM OF OVEN 26 CONTROL PANEL DOOR PARTS 27 PACKING AND ACCESSORIES 28 TABLE OF CONTENTS Page In interests of user safet...

Page 2: ...ly then close the door Note the results of the test taking care to keep clear of the operational oven Carry out 3D checks see above Reconnect the leads to the transformer Take care to observe correct polarity Carry out 4R checks see below Microwave ovens should not be used without a load To test for the presence of microwave energy within a cavity place a cup of cold water on the oven turntable cl...

Page 3: ...AND YELLOW EARTH BLUE NEUTRAL BROWN LIVE If the mains lead is replaced only part number QACCBA030WRE4 should be used SPECIFICATION Power Requirements 230 240 Volts 50 Hertz Single phase 3 wire grounded Power Consumption 1 2kW Power Output 800W watts nominal of RF microwave energy measured by way of IEC60705 Operating frequency of 2450 MHz Case Dimensions Width 449mm Height 282mm including foot Dep...

Page 4: ...oor latches 11 Ventilation openings 12 Outer case 13 Power supply cord 3 4 1 10 7 6 2 9 8 11 5 12 13 Turntable Roller stay Seal packing 1 Place the roller stay on the floor of the oven cavity engaging shaft 2 Then place the turntable on the roller stay 1 DIGITAL DISPLAY 2 EXPRESS COOK pad 3 EXPRESS DEFROST pad 4 TIMER Pads 5 POWER WEIGHT STOP CLEAR START AUTO MINUTE Pads 1 2 3 4 5 OVEN ...

Page 5: ...M HIGH Approx 70 560Watts Approx 50 400 Watts Approx 30 240 Watts NOTE TheON OFFtimeratiodoesnotexactlycorrespond to the percentage of microwave power because approx 3 seconds are needed for heating up the magnetron filament Approx 100 800 Watts OFF CONDITION DOOR OPEN MECHANISM The door can be opened by pulling the door Figure D 1 Door Open Mechanism MONITORED LATCH SWITCH AND STOP SWITCH 1 When ...

Page 6: ...bed in the Sharp Technical Training notes part number SERV LITMW01 The maximum leakage permitted in BS EN 60335 2 25 is 50W m2 equivalent to 5mW cm2 however it is not normal to detect any significant leakage therefore any leakage which is detected should be investigated It is essential that only leakage detectors with current calibration traceable to the National Physical Laboratories are used Sui...

Page 7: ...d c When touching the keys sometimes a key produces no signal 2 Control Unit The following symptoms indicate a defective control unit Before replacing the control unit perform the Switch unit test Procedure M to determine if control unit is faulty 2 1 In connection with keys a When touching the keys a certain group of keys do not produce a signal b When touching the keys no keys produce a signal 2...

Page 8: ...5 1 R70 RY2 R1 D71 VRS1 ZD70 RY1 D SWITCH UNIT TEST If the display fails to clear when the STOP CLEAR key is depressed first verify the lead wire harness is making good contact verify that the stop switch operates properly that is the contacts are closed when the door is closed and open when the door is open If the stop switch is good disconnect the lead wire harness that connects the switch unit ...

Page 9: ... 2 Control Unit The principal functions of these units and the signals communicated among them are explained below Switch Unit The switch unit is composed of a matrix signals generated intheLSIaresenttotheswitchunitthroughR60 R61 R62 and R63 When a switch button is touched a signal is completed through the switch unit and passed back to the LSI through R81 and R83 to perform the function that was ...

Page 10: ...hile the tact switch SW4 or SW7 is touched 17 AIN0 IN To input signal which communicates the door open close information to LSI Door close L level signal 0V Door open H level 5V 18 20 AIN1 AIN3 IN Terminal to change functions 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 function 21 VSS IN Power ...

Page 11: ...thecapacitorandresistorcircuitwith respect to XOUT terminal 34 XOUT OUT Internal clock oscillation frequency control output Output to control oscillation input of XIN 35 RESET IN Auto clear terminal Signal is input to reset the LSI to the initial state when power is supplied Temporarily set L level the moment power is supplied at this time the LSI is reset Thereafter set at H level 36 HOLD IN OUT ...

Page 12: ...istor 2SA1267Y KRA101M KRC101M KRC105M 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 so 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 m...

Page 13: ... If the door is not closed 4 If the outer case cabinet is not fitted WARNING Avoid possible exposure to microwave energy Please follow the instructions below before operating the oven Removal 1 CARRY OUT 3D CHECKS 2 Remove the single 1 screw holding the green yellow wire to the cavity 3 Disconnect the leads of the power supply cord from the noise filter referring to the Figure C 3 a 4 Release the ...

Page 14: ...olding the latch hook to the flange of the oven front face 3 With the 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 horizontal position of the latch hook should be adjusted so that the monitor switch is activated with the door closed The vertical position ...

Page 15: ...nd figure C 6 on how to handle the new film 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 Makesurethatmonitoredlatchswitch stopswitch and monitor switch are operating properly Refer to chapter Test Procedures B An approved microwave survey meter should be used to assure compliance...

Page 16: ...the manufacturer s instructions and any spacers are fitted to ensure that measurement is taken 5cm from the surface of the oven PROCEDURE 1 Place the beaker containing the water load in the oven cavity at the centre of the turntable The placing of this standard load in the oven is important not only to protect the oven but also to ensure that any leakage it is not disguised by too large a load abs...

Page 17: ... 680K 0 5W 10M 0 5W NOISE SUPPRESSION COIL 0 0033µ 250V 0 0033µ 250V NOISE FILTER 230V 240v 50Hz T HIGH VOLTAGE TRANSFORMER WITH 150 C THERMOSTAT IN PRIMARY WINDING MG MAGNETRON H V RECTIFIER C H V CAPACITOR 0 88µF AC2100V TURNTABLE MOTOR FAN MOTOR OVEN LIGHT D72 D3 D1 D71 D70 SW3 STOP SWITCH CONTROL UNIT TC OVEN THERMAL CUT OUT 125 C SW1 MONITORED LATCH SWITCH SW2 MONITOR SWITCH B2 B1 A5 A1 A3 OL...

Page 18: ...N L RED WHT ORG N C SW3 STOP SWITCH WHT WHT WHT ORG ORG ORG WHT ORG RED G Y CONTROL UNIT WHT WHT ORG BLU BRN RED RED TC THERMAL CUT OUT OVEN OL OVEN LAMP SP30 IC1 CN A RY1 CN B RY2 1 1 2 5 RED ORG WHT CN A CN B 2 RED ORG 1 3 4 5 WHT RED WHT WHT RED ORG WHT 2 1 N O COM N O FM FAN MOTOR NOISE FILTER WHT H V WIRE B MG MAGNETRON C H V CAPACITOR H V RECTIFIER T HIGH VOLTAGE TRANSFORMER POWER SUPPLY COR...

Page 19: ...N4005E ZD70 71 HZ7C2 Q30 KRC 101M R2 R3 R4 R10 27k R11 27k LIQUID CRYSTAL DISPLAY CN C CN B CN A AC N OVEN LAMP FAN MOTOR TURNTABLE MOTOR HIGH VOLTAGE TRANSFORMER DOOR SWITCH NOTE AC L FM CN C 5 CN C 4 CN C 3 CN C 2 CN C 1 CN C 6 IC1 IXA085DR R5 IF NOT SPECIFIED 1 4W 5 IF NOT SPECIFIED 1SS270A IF NOT SPECIFIED 0 01µF 16V 1N4005E 1N4005E LED1 LED2 LED3 10G471K VRS1 D2 ZD21 ZD20 SP30 D10 D20 D72 C80...

Page 20: ...R 244M SWITCH UNIT CIRCUIT DIAGRAM 1 2 3 4 SW4 5 6 SW5 SW6 SW7 10sec 10min 1min COOK DEFROST STOP CLEAR SW8 SW1 CN C CN C 6Pin HARNESS SW2 SW3 POWER WEIGHT START AUTO MINUTE Figure S 3 Switch Unit Circuit ...

Page 21: ...70 J1 D3 D70 CN A 5 1 R71 R70 ZD71 D74 D20 RY2 A B C 5 6 R40 R20 R72 R60 R61 R62 R63 JW1 R41 E E 1 B R42 R11 R50 B Q30 Q40 1 1 6 21 22 42 IC1 ZD1 SW1 JSW2 JW1 F SW2 SW3 R65 R64 SW4 SW5 WH 1 SW6 SW7 SW60 C1 SP30 AC LINE VOLTAGE IS SUPPLIED TO ALL PARTS ZD40 D2 R5 R4 R3 R2 R1 CF1 R12 R31 C60 C61 C10 C22 R81 C80 D80 D72 4 1 D71 VRS1 ZD70 Q70 C71 R73 RY1 D73 E B ZD21 ZD20 C20 CN B 3 D10 R10 DIP WARNIN...

Page 22: ...22 R 244M Figure S 5 Printed Wiring Board of Switch Unit SW8 CN C 6 6 1 1 CN G SW6 SW4 SW5 SW7 GREEN KR WHITE EH SW2 SW3 SW1 PRINTED WIRING BOARD OF SWITCH UNIT DIAGRAM ...

Page 23: ... 3 1E LHLD A179WRF0 U LED holder 1 AE 3 1F PSHEPA601WRE0 U LED sheet 1 AD C1 VCEAB31CW227M U Capacitor 220 uF 16V 1 AA C10 RC KZA087DRE0 U Capacitor 0 1 uF 50V 1 AB C20 VCEAB31VW227M U Capacitor 220 uF 35V 1 AA C21 VCEAB31VW106M U Capacitor 10 uF 35V 1 AB C22 RC KZA087DRE0 U Capacitor 0 1 uF 50V 1 AB C40 RC KZA087DRE0 U Capacitor 0 1 uF 50V 1 AB C41 VCEAB31CW476M U Capacitor 47 uF 16V 1 AA C42 RC ...

Page 24: ... 2 AA R72 VRD B12EF822J U Resistor 8 2k ohm 1 4W 1 AA R73 VRD B12EF153J U Resistor 15k ohm 1 4W 1 AA R80 VRD B12EF153J U Resistor 15k ohm 1 4W 1 AA R81 VRD B12EF472J U Resistor 4 7k ohm 1 4W 1 AA RW VRD B12EF104J U Resistor 100k ohm 1 4W 1 AA RY1 RRLY A080DRE0 U Relay OJ SH 124LM 1 AG RY2 RRLY A105DRE0 U Relay OMIF S 112LM 1 AG SP30 RALM A014DRE0 U Buzzer PKM22EPT THAI 1 AG VRS1 RH VZA032DRE0 U Va...

Page 25: ...s marked may cause undue microwave exposure MARK SPARE PARTS DELIVERY SECTION 5 CDORFG014URK0 U Door assembly G 1 BD 5 CDORFW012URK0 U Door assembly W 1 BD 5 CDORFB006URK0 U Door assembly B 1 BD 5 CDORFS005URK0 U Door assembly SL 1 BD 5 1 FDORFA299WRT1 U Door panel assembly 1 AU 5 2 GCOVHA366WRF0 U Choke cover 1 AG 5 3 GWAKPG006URF0 U Door frame G 1 AT 5 3 GWAKPW023URF0 U Door frame W 1 AT 5 3 GWA...

Page 26: ... screw connection LX CZA030WRE0 7 1 7 1 2 1 7 15 1 13 4 7 7 14 4 8 6 2 1 17 4 10 1 18 4 2 4 13 2 2 2 2 4 12 7 2 6 1 1 7 4 6 7 1 7 1 7 1 1 16 7 2 1 14 7 1 7 6 7 3 7 7 7 1 4 4 4 1 4 9 7 7 7 1 7 1 7 1 1 5 7 1 7 4 1 3 1 4 1 1 1 2 4 3 7 1 7 1 1 6 7 2 1 11 7 10 1 15 7 10 4 11 x4 x2 EXPLODED DIAGRAM OF OVEN ...

Page 27: ...R 244M 27 CONTROL PANEL PARTS CONTROL PANEL DOOR PARTS DOOR PARTS 5 3 5 4 5 1 5 7 5 9 5 9 5 6 5 2 5 9 5 9 5 9 5 5 5 8 5 3 4 3 7 3 7 3 5 3 3 3 6 3 2 3 1 3 1E 3 1F 3 1D 3 7 ...

Page 28: ... OVEN BAG SSAKHA047WRE0 R 244 W G B SL M SPAKCA427URR0 BOTTOM PAD FPADBA009URK0 INTO THE OVEN CAVITY DIAGONALLY ACCESSORY HOLDER SPADPA014URE0 PRINTED MATTER COPYRIGHT C 2001 BY SHARP CORPORATION ALL RIGHT RESERVED No part of this publication may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photocopying recording or otherwise without p...

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