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In interests of user-safety the oven should be restored to its original condition and only parts identical to those specified
should be used.
BEFORE SERVICING - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2
WARNING TO SERVICE PERSONNEL - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3
PRODUCT SPECIFICATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4
APPEARANCE VIEW - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4
OPERATION SEQUENCE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5
FUNCTION OF IMPORTANT COMPONENTS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6
TROUBLESHOOTING GUIDE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7
TEST PROCEDURES - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8
TOUCH CONTROL PANEL ASSEMBLY - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12
PRECAUTIONS FOR USING LEAD -FREE SOLDER - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 13
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 14
MICROWAVE MEASUREMENT - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 19
CIRCUIT DIAGRAMS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 20
PARTS LIST - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 24
R27STM.indd 1
SERVICE MANUAL
STIR
TURN
KG
PCS
MODEL
CONTENTS
This document has been published to be used for after sales service only.
The contents are subject to change without notice.
1
No. S0801R27STPKS
MICROWAVE OVEN
R-27STM
R-27STM
11/3/08 2:04:24 PM
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Summary of Contents for Sharp R-27STM
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Page 1: Table Of Contents
R-27STM SERVICE MANUAL No. S0801R27STPKS STIR TURN MICROWAVE OVEN R-27STM MODEL In interests of user-safety the oven should be restored to its original condition and only parts identical to those specified should be used. CONTENTS BEFORE SERVICING - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2... -
Page 2: Before Servicing
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. -
Page 3: Warning To Service Personnel
(2) minutes. When the two minutes has elapsed (timer at Sharp recommend that wherever possible fault-finding is car - zero) carefully check that the water is now hot. If the water re - ried out with the supply disconnected. It may, in some cases,... -
Page 4: Product Specifications
R-27STM PRODUCT SPECIFICATIONS ITEM DESCRIPTION 230 - 240 Volts 50 Hertz Power Requirements Single phase, 3 wire earthed 1.22 kW Power Consumption 800 watts nominal of RF microwave energy (IEC60705 Test Procedure) Power Output Operating frequency 2450 MHz Width 460 mm... -
Page 5: Operation Sequence
R-27STM TOUCH CONTROL PANEL 1. DIGITAL DISPLAY 2. INDICATORS STIR TURN MICRO COOK BUTTONS: 3. AUTO COOK 4. EXPRESS COOK 5. EXPRESS DEFROST 6. START/AUTO MINUTE 7. STOP/CLEAR 8. POWER LEVEL 9. TIME/WEIGHT KNOB NOTE: Some one-touch cooking features such as "START/AUTO MINUTE" are disabled after three minutes when the oven is not in use. -
Page 6: Function Of Important Components
R-27STM MEDIUM HIGH, MEDIUM, MEDIUM LOW, LOW NOTE: The ON/OFF time ratio does not exactly correspond COOKING to the percentage of microwave power, because ap- prox. 3 seconds are needed for heating up the mag- When the microwave oven is preset for variable cooking power, netron filament. -
Page 7: Troubleshooting Guide
R-27STM TROUBLESHOOTING GUIDE FOREWORD IMPORTANT: When troubleshooting the microwave oven, it is helpful to follow If the oven becomes inoperative because of a blown fuse T6.3A the Sequence of Operation in performing the checks. Many of in the 1st. latch switch - relay (RY1) - 2nd. interlock relay (RY2)- the possible causes of trouble will require that a specific test be monitor switch circuit, check the 1st. -
Page 8: Test Procedures
The power output of this oven is rated using the method specified by IEC 60705. Full details of how to curry out this procedure can be found in the Sharp Technical Training notes which is available from Sharp Parts Centre (part number SERV -LITMW01). - Page 9 R-27STM CARRY OUT 4R CHECKS. C: 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 of the high voltage rectifier and note the reading obtained. Reverse the me - ter leads and note this second reading.
- Page 10 R-27STM H: FUSE T6.3A CARRY OUT 3D CHECKS. If the fuse T6.3A is blown when the door is opened, check the 1st. latch switch, relay (RY1), 2nd. interlock relay (RY2) and monitor switch. If the fuse T6.3A is blown by incorrect door switching replace the defective switch(es) and the fuse T6.3A.
- Page 11 R-27STM L: SWITCH UNIT TEST CARRY OUT 3D CHECKS. Isolate the switch unit with the control panel frame to be tested. Using an ohmmeter and referring to the switch unit matrix indicated on the switch unit circuit, check the circuit between the pins of the switch unit that correspond to the STOP button.
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Page 12: Touch Control Panel Assembly
R-27STM TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units as shown in the touch control panel circuit. (1) Switch Unit (2) Control Unit The principal functions of these units and their related signals are explained below. -
Page 13: Precautions For Using Lead-Free Solder
R-27STM (4) Ensure that these leads remain isolated from other 2) Servicing the touch control panel with power supply from an components and oven chassis by using insulation tape. external power source: After that procedure, re -connect the power supply cord. -
Page 14: Component Replacement And Adjustment Procedure
R-27STM COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING AGAINST HIGH VOLTAGE: Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may result in se - vere, possibly fatal, electric shock. (Example) High Voltage Capacitor, High Voltage Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage fuse, High Voltage Harness etc.. - Page 15 TURNTABLE MOTOR REMOVAL REMOVAL Where the corners have been snipped off bend corner areas flat. No sharp edges must be evident after removal of the Disconnect the power supply cord. turntable motor cover. Remove turntable and turntable support from oven cavity.
- Page 16 R-27STM Remove one (1) screw holding turntable motor to oven cav - Re -install the turntable motor cover to the bottom plate with ity. one (1) screw. Remove the TTM packing from the turntable motor. TTM packing Now, the turntable motor is free.
- Page 17 R-27STM Power Supply Oven Cavity P ower S upply Cord Back Plate C ord Screw Moulding C ord S topper Brown Wire Green/Yellow Oven C avity Wire B ack P late Blue Wire S quare Noise Filter Hole Figure C-3(a) Power Supply Cord Replacement...
- Page 18 R-27STM DOOR REPLACEMENT REMOVAL Catch two (2) pins of door panel on two (2) hole of upper and lower oven hinges Disconnect the power supply cord. Re-install choke cover to door panel by pushing. Open the door slightly. NOTE: After any service to the door;...
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Page 19: Microwave Measurement
R-27STM MICROWAVE MEASUREMENT After any repair, the microwave oven must be checked for microwave leakage to ensure continued safe operation. BS EN 60335-2-25 specifies that the maximum permitted leakage with a load of 275 ml is 50 W/m (equivalent to 5 mW/cm ) at a distance of 5 cm from the oven. -
Page 20: Circuit Diagrams
R-27STM CIRCUIT DIAGRAMS Oven Schematic SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. NOTE: " " indicates components with potentials above 250V NOISE FILTER TEMP. FUSE 2ND. INTERLOCK RELAY (RY-2) (RY-1) CONTROL UNIT 2ND. INTERLOCK RELAY CONTROL SWITCH 1ST. LATCH... - Page 21 R-27STM Pictorial Diagram Figure S-1. Pictorial Diagram R27STM.indd 21 11/3/08 2:04:30 PM...
- Page 22 R-27STM Control Unit Circuit Figure S-2. Control Unit Circuit R27STM.indd 22 11/3/08 2:04:31 PM...
- Page 23 R-27STM Printed Wiring Board CN-G IC SIDE JUMP1 (JUMP A) JUMP4 D1 D3 VRS1 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...
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Page 24: Parts List
R-27STM PARTS LIST NOTE: Parts marked "*" may cause undue microwave exposure. Parts marked "∆" are used in voltage more than 250V. REF. PRICE PARTS CODE DESCRIPTION Q’ty RANK OVEN PARTS ELECTRIC PARTS 1 -1 QACC-A126WRZZ Power supply cord 1 -1... - Page 25 R-27STM REF. PRICE PARTS CODE DESCRIPTION Q’ty RANK MISCELLANEOUS NTNT-A034WRF0 Turntable FROLPA113WRKZ Turntable support SCREWS, NUTS AND WASHERS XHPS740P08K00 Screw : 4mm x 8mm Screw : 4mm x 10mm XETS740P10000 XHPS740P08000 Screw : 4mm x 8mm LX-CZ0052WRE0 Special screw LX-CZA073WRE0...
- Page 26 R-27STM 1-13 4-11 4-13 7-10 4-12 4-16 4-10 1-10 4-14 1-11 1-14 1-10 1-12 4-15 R27STM.indd 26 11/3/08 2:04:34 PM...
- Page 27 R-27STM 5-11 5-10 5-13 5-12 5-14 3-10 5-12 3-10 3-10 3-11 3-10 R 27S T M.indd 27 11/3/08 2:04:35 P M...
- Page 28 PACKING CASE Not replaceable items. (CPADBA287WRKZ) SPAKCE720WREZ 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.