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R-27STM

CIRCUIT DIAGRAMS

Oven Schemati

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

HIGH VOLTAGE

TRANSFORMER

MAGNETRON

H.V. RECTIFIER

TURNTABLE

MOTOR

FAN MOTOR

OVEN LAMP

MONITOR SWITCH

CONTROL UNIT

2ND.
INTERLOCK
RELAY

1ST. LATCH
SWITCH

2ND. INTERLOCK
RELAY CONTROL
SWITCH

TTM

(RY-1)

(RY-2)

EARTH

230 - 240V

50Hz

BLU

BRN

LIVE

NEUTRAL

G-Y

FUSE

T6.3A

NOISE SUPPRESSION COIL

NOISE FILTER

TEMP.
FUSE

H.V. FUSE

0.6A

NOTE: " " indicates components with potentials above 250V

H.V. RECTIFIER

TURNTABLE

MOTOR

FAN MOTOR

OVEN LAMP

CONTROL UNIT

2ND.
INTERLOCK
RELAY

TTM

(RY-1)

(RY-2)

EARTH

BLU

BRN

LIVE

NEUTRAL

G-Y

NOISE SUPPRESSION COIL

NOISE FILTER

HIGH VOLTAGE

TRANSFORMER

MAGNETRON

MONITOR SWITCH

1ST. LATCH
SWITCH

2ND. INTERLOCK
RELAY CONTROL
SWITCH

230 - 240V

50Hz

FUSE

T6.3A

TEMP.
FUSE

H.V. FUSE

0.6A

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. COOKING TIME PROGRAMMED.

3. START BUTTON PRESSED.

Figure O-1 Oven Schematic-OFF Condition

Figure O-1 Oven Schematic-ON Condition

R27STM.indd 20

11/3/08 2:04:30 PM

Summary of Contents for R-27STM

Page 1: ... COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 14 MICROWAVE MEASUREMENT 19 CIRCUIT DIAGRAMS 20 PARTS LIST 24 SERVICE MANUAL No S0801R27STPKS MICROWAVE OVEN MODEL R 27STM In interests of user safety the oven should be restored to its original condition and only parts identical to those specified should be used This document has been published to be used for after sales service only The contents ar...

Page 2: ...ave 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...

Page 3: ...uter 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 compo nents and the oven chassis Use insulation tape if neces sary When the testing is completed carry out 3D checks and reconnect the leads to the primary of the power transformer REMEMBER TO CHECK 4R Reconnect all le...

Page 4: ...er 272 mm Control Complement Touch Control System Timer 0 99 minutes 90 seconds Clock 1 00 12 59 or 0 00 23 59 Microwave Power for Variable Cooking Repetition Rate 100P Full power throughout the cooking time 70P approx 70 of FULL Power 50P approx 50 of FULL Power 30P approx 30 of FULL Power 10P approx 10 of FULL Power EXPRESS COOK button EXPRESS DEFROST button POWER LEVEL button STOP CLEAR button ...

Page 5: ...uit where it is doubled to negative voltage of ap proximately 4000 volts D C The 2450 MHz microwave energy produced in the magnetron generates a wave length of 12 24 cm This energy is channelled OPERATION SEQUENCE through the waveguide transport channel into the oven cavity where the food is placed to be cooked When the cooking time is up a signal tone is heard and the re lays RY1 RY2 go back to t...

Page 6: ...elay RY1 and the 2nd interlock relay RY2 fail to open the fuse T6 3A blows simultaneous ly with closing the contacts COM NC of the monitor switch CAUTION BEFORE REPLACING A FUSE T6 3A TEST THE 1ST LATCH SWITCH RELAY RY1 AND 2ND IN TERLOCK RELAY RY2 AND MONITOR SWITCH FOR PROPER OPERATION REFER TO CHAP TER TEST PROCEDURE FUNCTION OF IMPORTANT COMPONENTS FUSE T6 3A The fuse T6 3A blows when the cont...

Page 7: ... the START button is touched Display appears Oven lamp does not light Display appears Fan motor does not operate Display appears Turntable motor does not operate Display appears Oven or any electrical parts does not stop when cooking time is 0 or STOP button is pressed Oven seems to be operating but little or no heat is pro duced in oven load Micro wave power level is set at 100 Oven does not seem...

Page 8: ... Calculate the output power using the following formula 555 R F Power Output T2 T1 x 80 NOTE The result from this test should be within the allowance of 2000cc alternative method 10 MICROWAVE LEAKAGE TEST This oven should be tested for microwave leakage on completion of any repair or adjustment following the procedure described in the Sharp Technical Training notes part number SERV LITMW01 The max...

Page 9: ...apacitor 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 Common terminal to Normally open terminal Common terminal to Normally close terminal Released Open circuit Short circuit Depressed Short circuit Ope...

Page 10: ...med with only a voltmeter and ohmmeter In this service manual the touch control panel assembly is divided into two units Control Unit and Switch Unit and also the Control Unit is divided into two units CPU Unit and Pow er Unit and troubleshooting by unit replacement is described according to the symptoms indicated 1 Switch Unit Note Check switch unit wire harness connection before replacement The ...

Page 11: ...y 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 12 6V D C Oven lamp Turntable motor Cooling fan motor RY2 Approx 12 1V D C High voltage transformer CARRY OUT 4R CHECKS N PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD PWB IS OPEN To protec...

Page 12: ...is available in order to compose a basic standard time in the clock circuit It accompanies a very small error because it works on commercial frequency 7 2nd Interlock Relay Control Switch A switch to tell the LSI if the door is open or closed 8 Back Light Circuit A circuit to drive the back light Light emitting diodes LD1 LD4 SERVICING FOR TOUCH CONTROL PANEL 1 Precautions for Handling Electronic ...

Page 13: ... 1 Soldering iron 60W It is recommended to use a soldering iron with a grounding terminal 2 Oscilloscope Single beam frequency range DC 10MHz type or more advanced model 3 Others Hand tools 4 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 connector of the key unit to the control unit being...

Page 14: ...60 333 seconds Don t let the wire leads touch to the following parts 111 High voltage parts 111 Magnetron High voltage transformer High voltage ca pacitor High voltage rectifier assembly and High volt age fuse Hot parts 222 Oven lamp Magnetron High voltage transformer and Oven cavity Sharp edge 333 Bottom plate Oven cavity Waveguide flange and other metallic plate Movable parts to prevent a fault ...

Page 15: ...s of high voltage recti 777 MAGNETRON REMOVAL REMOVAL CARRY OUT 111 3D CHECKS Disconnect the wire leads from the magnetron 222 Remove the two 2 screws holding the air duct to the oven 333 cavity Release the air duct from the oven cavity 444 Carefully remove the four 4 screws holding the magnetron 555 to the waveguide flange Lift up magnetron with care so that the magnetron antenna 666 is not hit b...

Page 16: ... the fan blade to the fan motor shaft according to the 111 following procedure Hold the centre of the bracket which supports the shaft of 222 the fan motor on the flat table Apply the screw lock tight into the hole for shaft of the fan 333 blade Install the fan blade to the shaft of fan motor by pushing the 444 fan blade with a small light weight ball peen hammer or rubber mallet CAUTION DO NOT HI...

Page 17: ... SWITCH AND MONITOR SWITCH ADJUSTMENT CARRY OUT 111 3D CHECKS If the 1st latch switch 2nd interlock relay control switch and 222 monitor switch do not operate properly due to a misadjust ment the following adjustment should be made Loosen the two 2 screws holding latch hook to the oven 333 cavity front flange With door closed adjust latch hook by moving it back and 444 forth and up and down In and...

Page 18: ...ing to 333 the door frame Re install latch head to the door frame Re install door panel to door frame by fitting ten 10 tabs of 444 door frame to ten 10 holes of door panel Put sealer film on door panel Refer to Sealer Film about 555 how to handle new one Catch two 2 pins of door panel on two 2 hole of upper 666 and lower oven hinges Re install choke cover to door panel by pushing 777 NOTE After a...

Page 19: ...s instructions and any spacers are fitted to ensure that measurement is taken 5cm from the surface of the oven PROCEDURE 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 111 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 absorbing energy C...

Page 20: ...USE 0 6A B1 B2 NOTE indicates components with potentials above 250V H V RECTIFIER TURNTABLE MOTOR FAN MOTOR OVEN LAMP CONTROL UNIT 2ND INTERLOCK RELAY OL FM TTM RY 1 RY 2 EARTH BLU BRN LIVE NEUTRAL G Y N L NOISE SUPPRESSION COIL NOISE FILTER B1 B2 HIGH VOLTAGE TRANSFORMER MAGNETRON MONITOR SWITCH 1ST LATCH SWITCH 2ND INTERLOCK RELAY CONTROL SWITCH 230 240V 50Hz FUSE T6 3A TEMP FUSE H V FUSE 0 6A S...

Page 21: ...1 T1 RY1 RY2 GRY GRY RED ORG WHT CN B 2 1 GRN GRY COM N O GRY HIGH VOLTAGE CAPACITOR HIGH VOLTAGE FUSE H V RECTIFIER HIGH VOLTAGE COMPONENTS MAGNETRON TURNTABLE MOTOR HIGH VOLTAGE TRANSFORMER RED RED GRY RED WHT WHT ORG F1 FUSE LIVE NEUTRAL FAN MOTOR BLU GRY RED OVEN LAMP RED BRN BLU L N WHT RED Power Supply Cord Oven Cavity Back Plate Screw Noise Filter G Y R E D GRY WHT ORG B L K Figure S 1 Pict...

Page 22: ...22 R 27STM Control Unit Circuit Figure S 2 Control Unit Circuit R27STM indd 22 11 3 08 2 04 31 PM ...

Page 23: ...R1 C12 ZD2 J1 ZD3 R20 JUMP2 JUMP3 R2 B E JUMP1 JUMP4 JUMP A SP1 C6 R3 D5 D6 C1 R21 C5 R22 T1 VRS1 P S D20 Q23 B B B E E E C21 Q22 Q21 D2 D1 D3 D4 ZD1 RY1 RY2 D21 d a b c Figure S 3 Printed Wiring Board of Power Unit Figure S 4 Printed Wiring Board of Switchr Unit R27STM indd 23 11 3 08 2 04 32 PM ...

Page 24: ...W MA138WRE0 Monitor switch Interchangeable 1 AH 1 11 QSW MA148WRE0 Monitor switch Interchangeable 1 AM 1 12 RTRN A755WRZZ High voltage transformer 1 BH 1 12 RTRN A733WRZZ High voltage transformer Interchangeable 1 BM 1 13 QFS TA014WRE0 Temperature fuse 150ºC Oven 1 AG 1 14 RMOTDA265WRZZ Turntable motor 1 AS 1 14 RMOTDA173WRE0 Turntable motor Interchangeable 1 AX 1 14 RMOTDA253WRZZ Turntable motor ...

Page 25: ... AN 3 5 HPNLCC201WRTZ Control panel 1 AU 3 6 JBTN B515WRTZ Key button A 1 AH 3 8 JKNBKA764WRTZ Timer knob 1 AM 3 9 PCUSUA173WRP0 Cushion 1 AC 3 10 XEPS730P08XS0 Screw 3mm x 8mm 15 AB 3 11 MSPRCA169WREZ Earth spring 1 AC DOOR PARTS 5 1 FDORFA397WRTZ Door panel assembly 1 BB 5 2 GWAKPB248WRTZ Door frame 1 AY 5 3 HDECQA392WRRZ Door decoration A 1 AN 5 4 HDECQA393WRPZ Door decoration B 1 AH 5 5 JHNDMA...

Page 26: ... 4 16 4 10 4 2 7 8 7 9 7 9 7 8 7 7 4 3 6 1 6 2 7 8 7 6 7 8 4 9 1 8 7 1 4 5 4 11 4 8 7 8 1 5 7 8 7 6 4 4 4 12 4 13 4 14 4 15 4 7 7 7 7 1 1 4 1 6 1 10 1 11 7 3 7 4 7 10 7 6 7 2 7 1 1 10 1 14 1 2 2 3 2 3 1 12 7 1 4 6 1 13 1 3 7 8 7 8 7 8 R27STM indd 26 11 3 08 2 04 34 PM ...

Page 27: ...R 27STM 27 5 9 5 13 6 5 5 8 5 6 5 2 5 10 5 11 5 12 5 12 5 1 6 4 6 6 3 2 3 1 3 4 3 10 3 9 3 10 3 3 3 6 3 5 3 11 5 14 5 7 5 5 5 4 5 3 3 8 3 10 3 10 3 7 R 27S TM indd 27 11 3 08 2 04 35 PM ...

Page 28: ... BAG SSAKHA014WRE0 DOOR PROTECTION SHEET SPADPA580WRE0 BOTTOM PAD ASSEMBLY FPADBA714WRKZ AC CORD PAD SPADBA371WRE0 COPYRIGHT 2008 BY SHARP CORPORATION ALL RIGHTS RESERVED No part of this publication may be reproduced stored in retrieval systems or transmitted in any form or by any means electronic mechanical photocopying recording or other wise without prior written permission of the publisher R27...

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