R-200BK R-200BW SERVICE MANUAL
Contents
1. 2 C SP1 3 Printed Wiring Board 61 0 e e e e e e s E a73 0 4 na OO ed Ta e emu 070 6 2E Q721 u Lu Q71 070 om m Figure S SOK D06 TTEN ol EC 28 PARTS LIST Note The parts marked A may cause undue microwave exposure The parts marked are used in voltage more than 250V REF NO PART NO QSW MA131W FFS BA020W FACCDA040W QSOCLA021W FH DZA082W DESCRIPTION ELECTRIC PARTS Secondary interlock switch door sensing switch C T fuse monitor switch assembly Power supply cord Oven lamp socket High voltage rectifier R 200BK R 200BW Q TY CODE C QZA193W C QZA199W High voltage capacitor High voltage capacitor Interchangeable OTEA338W Fan motor OTEA355W Fan motor Interchangeable agnetron NO O OO0 JJ O 1 QO No Ra V MZA282W LMPTA030W OTDA18 6W OTDA211W RTHM A078W Ri Ri R R RV MZA2 2 6WRI R R R R agnetron Interchangeable Oven lamp Turntable motor Turntable motor Interchangeable Thermal cut out 125 C opooocooo0doovoooo0ovoxooooo RIRN A560W GCABUA657W GCABUA659W GDAI A304W GLEGPA074W2. CPWBFA758W CPWBFA759W CPWBFA772W QC A430D HPN 133W Power transformer CABINET PARTS Outer case cabinet R 200BK Outer case cabinet R 200BW Bottom plate Foot CONTROL PANEL PARTS Timer unit assembly R 200BK Timer unit assembly R 200BW Control unit 3 pin connector CN A Timer sheet JKNBKA5 9 7WRE JKNBKA5 98WRF LHLD A184WRF B62CA155 VCEAB31EW10 NO 0 O O 0 000 Timer knob R 200BK Timer knob R 200BW ED holder Capacitor 1 5 uF 160VAC Capacitor 1000 uF 25V gt RC KZA087D VCEAB31CW47 RC KZA087D VCKYD11CY1 VCEAB31HW1 Capacitor 0 1 uF 50V Capacitor 47 uF 16V Capacitor 0 1 uF 50V Capacitor 01 uF 16V Capacitor O 1 UE 50V VCEAB31VW1 VCKYD11CY1 VCKYD11CY1 RCRS A012D VHD1 VHD1SS27 VHD1SS27 VHD1SS27 VHD1SS27 QFS AA00 Capacitor 10 uF 35V Capacitor 0 01 uF 16V 0 Capacitor 0 01 uF 16V Ceramic resonat Diode 1N4005E Diode 1SS270A Diode 1SS270A r CST4 00MGW Diode 1SS270A Diode 1SS270A IC PROTECTOR RH IZA86 VHPLTL1C LSI VS2SC174 VS2SA1267Y 3 VSDTC143ES 3 Light emitting diode LI Transistor 2SC174 Transistor 2SA126 Transistor DTC143 VSDTA143ES 3 VSDTC143ES 3 VSDTA143ES 3 VRD B12HF201J VRS B13AA102J D Transistor DTC143 Transistor DTA143 Resistor 200 Resis
3. Figure C 3 Turntable Motor Cover 8 9 Remove the turntable motor from the oven cavity Remove the O ring and washer from the turntable motor 10 Now the turntable motor is free Re install 1 2 3 Remove the any sharp edges on the turntable motor cover and the bottom plate with the cutting pliers Re install the O ring Apply the grease Shinetsu silicone grease G 420 of Sinetsu Chemical Co Ltd or Toray Silicone grease SH 14 of Toray Silicone Co Ltd to the O ring and the base of the turntable motor shaft as shown in Figure C 4 Re install the turntable motor with the O ring and washer to the oven cavity with the single 1 screw Re connect the wire leads to the turntable motor Insert the tab of the turntable motor cover into the hole of the bottom plate as shown in Figure C 3 Re install the turntable motor cover to the bottom plate with one 1 screw XHTSD40PO8RVO or XFPSD40P08K00 as shown in Figure C 3 Washer Figure C 4 Washer and O ring installation and Grease Applying R 200BK R 200BW COOLING FAN MOTOR REMOVAL REMOVAL OQ G N NO 9 Disconnect the power supply cord and remove outer case Open the door and block it open Discharge high voltage capacitor Disconnect the wire leads from the fan motor Remove the one 1 screw holding the chassis support to the oven cavity front plate Remove the chassis support Release the filame
4. HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL SO DO NOT ATTEMPT TO MEASURE THE FILAMENT AND HIGH VOLTAGE Q N CONDO HIGH VOLTAGE RECTIFIER TEST Disconnect the power supply cord and then remove outer case Open the door and block it open Discharge high voltage capacitor Isolate the rectifier from the circuit Using the highest ohm scale of the meter read the resistance across the terminals and observe reverse the leads to the rectifier terminals and observe meter reading If a short is indicated in both directions or if an infinite resistance is read in both directions the rectifier is probably defective and should be replaced Reconnect all leads removed from components during testing Reinstall the outer case cabinet Reconnect the power supply cord after the outer case is installed Q N O O 10 R 200BK R 200BW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 8 Run the oven and check all functions NOTE Be sure to use an ohmmeter that will supply a forward bias voltage of more than 6 3 volts HIGH VOLTAGE CAPACITOR TEST Disconnect the power supply cord and then remove outer case Open the door and block it open Discharge high voltage capacitor If the capacitor is open no high voltage will be available to the magnetron Disconnect input leads and check for short or open between the terminals using an ohmmeter Checking with a high ohm scal
5. Terminal Positive lock connector Lever Pull down Figure C 2 Positive lock connector CONTROL PANEL ASSEMBLY REMOVAL Disconnect the power supply cord and remove outer case Open the door and block it open Discharge high voltage capacitor Disconnect the leads from the control unit Remove the one 1 screw holding the chassis support to the front plate of the oven cavity Remove the chassis support from the oven Lift up the control panel and release it from the oven cavity Now the control panel assembly is free Open the door Remove the switch lever from the front plate of the oven cavity TURNTABLE MOTOR REMOVAL Removal 1 2 3 4 Disconnect the power supply cord Remove the turntable and turntable support from the oven cavity Turn the oven over Cut the four 4 bridges holding the turntable motor cover to the bottom plate with the cutting pliers as shown in Figure C 3 CAUTION DO NOT DROP THE TURNTABLE MOTOR 5 6 7 COVER INTO THE OVEN AFTER CUTTING THE BRIDGES BECAUSE IT WILL DAMAGE THE WIRE LEADS OF THE MOTOR AND IT IS DIFFICULT TO REMOVE IT OUT OF THE OVEN Remove the turntable motor cover from the bottom plate Disconnect the wire leads from the turntable motor Remove the single 1 screw holding the turntable motor to the oven cavity Screw XHTSD40P08RVO or XFPSD40P08K00 Cutting Pliers Turnrable Motor Cover
6. Disconnect the power supply cord and then remove outer case Open the door and block it open Discharge high voltage capacitor Isolate the switch and connect the ohmmeter to the common COM and normally open NO terminal of the switch The meter should indicate an open circuit with the door open and a closed circuit with the door closed If improper operation is indicated replace the secondary interlock switch Reconnect all leads removed from components during testing Reinstall the outer case cabinet Reconnect the power supply cord after the outer case is installed Run the oven and check all functions PRIMARY INTERLOCK SYSTEM TEST DOOR SENSING SWITCH 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Isolate the switch and connect the ohmmeter to the common COM and normally open NO terminal of the switch The meter should indicate an open circuit with the door open and a closed circuit with Q N CONDO 11 R 200BK R 200BW PROCEDURE LETTER TEST PROCEDURES COMPONENT TEST the door closed If improper operation is indicated replace the door sensing switch Reconnect all leads removed from components during testing Reinstall the outer case cabinet Reconnect the power supply cord after the outer case is installed Run the oven and check all functions RIMARY INTERLOCK RELAY
7. R 200BK R 200BW SHARP SERVICE MANUAL 1802R200BPW MICROWAVE OVEN mopeLs R 200BK E R 200BW In the interest of user safety the oven should be restored to its original condition and only parts identical to those specified should be used WARNING TO SERVICE PERSONNEL Microwave ovens con tain circuitry capable of producing very high voltage and current contact with following parts may result in a severe possibly fatal electrical shock High Voltage Capacitor High Voltage Power Transformer Magnetron High Voltage Recti fier Assembly High Voltage Harness etc TABLE OF CONTENTS Page PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY INSIDE FRONT COVER BEFORE SERVICING ed neninn u k na nn Aa aids dan INSIDE FRONT COVER WARNING TO SERVICE PERSONNEL uu m u yaaa pas um aqa EEE EENAA EEA da 1 MICROWAVE MEASUREMENT PROCEDURE nceo etie er AEAEE ea iaa AEAEE EEE NAVE 2 FOREWORD AND WARNING eee Saa E T aE a E a a A EEE 3 PRODUCT SPECIFICATIONS L m E A dl dd AA NE Peel e 4 GENERAL INFORMATION rZ Lu uu ba id a a E e E aida dada 4 OPERATION aiii Qa SS AE a E AED E A AE wa at Qa AA Qu QA satin eae 6 TROUBLESHOOTING GUIDE u Z u uu ad a a A E 9 TEST PROCEDURE u u wane niin A A AA A m asan id 10 TOUGH CONTROL PANEL cir LS L A upa A AAA 16 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE cccccccceceescceeeeseeeeeeesesea
8. circuit It accompanies a very small error because it works on commercial frequency 16 4 ACL Acircuit to generate a signals which resets the LSI to the initial state when power is supplied 5 Buzzer Circuit The buzzer is responsive to signals from the LSI to emit audible sounds completion sound 6 Door Sensing Switch Stop Switch A switch to tell the LSI if the door is open or closed 7 Relay Circuit To drive the magnetron fan motor turntable motor and light the oven lamp 8 Encoder The encoder generates the pulse signal and the pulse signal is sent to the LSI 9 Indicator Circuit Indicator elements are the Light emitting diodes LD1 LD20 This circuit consists of 4 digits and 5 segments R 200BK R 200BW DESCRIPTION OF LSI LSI IZA860DR The I O signal of the LSI IZA860DR are detailed in the following table Pin No Signal Description Auto clear terminal Signal is input to reset the LSI to the initial state when power is applied Temporarily set to L level the moment power is applied at this time the LSI is reset Thereafter set at H level Signal coming from encoder When the encoder is turned the contacts of encoder make pulse signals And pulse signals are input into INT A D converter power source voltage The power source voltage to drive the A D converter in the LSI Connected to GND Reference voltage input terminal A reference voltage is appli
9. NOOR G N Run the oven and check all function Disconnect the power supply cord and then remove outer case Disconnect the leads to the primary of the power transformer Ensure that the leads remain isolated from other components and oven chassis by using insulation tape After that procedure reconnect the power supply cord Disconnect the power supply cord and then remove outer case Reconnect the leads to the primary of the power transformer Reconnect the power supply cord after the outer case is installed TEST PROCEDURE RE CONDITION POSSIBLE CAUSE AND DEFECTIVE PARTS PROBLEM Home fuse blows when power cord is plugged into wall receptacle O SHORT IN POWER CORD MAGNETRON POWER TRANSFORMER H V RECTIFIER ASSEMBLY HIGH VOLTAGE CAPACITOR MAGNETRON THERMAL CUT OUT PRIMARY INTERLOCK SYSTEM SECONDARY INTERLOCK SWITCH MONITOR SWITCH C T FUSE R 200BK R 200BW CK Check RE Replace OVEN LAMP OR SOCKET COOLING FAN MOTOR TURNTABLE MOTOR CONTROL UNIT OR RELAY WRONG OPERATION LOW VOLTAGE DIRTY OVEN CAVITY OFF CONDITION C T fuse blows when power cord is plugged into wall receptacle O SHORT OR OPEN WIRING C T fuse blows when the door is opened Fan motor does not operate All other electric components function Oven lamp does not light at all All other electric components function Turntable motor does not operate All oth
10. RY1 RWNY D ONDA COND oO Disconnect the power supply cord and then remove outer case Open the door and block it open Discharge high voltage capacitor Disconnect two 2 wire leads from the male tab terminals of the Primary Interlock Relay Check the state of the relay contacts using a ohmmeter The relay contacts should be open If the relay contacts are closed replace the circuit board entirely or the relay itself Reconnect all leads removed from components during testing Reinstall the outer case cabinet Reconnect the power supply cord after the outer case is installed Run the oven and check all functions MONITOR SWITCH TEST Q N CONDO Disconnect the power supply cord and then remove outer case Open the door and block it open Discharge high voltage capacitor Before performing this test make sure that the secondary interlock switch and the primary interlock relay are operating properly according to the above Switch Test Procedure Disconnect the wire lead from the monitor switch COM terminal Check the monitor switch operation by using the ohmmeter as follows When the door is open the meter should indicate a closed circuit When the monitor switch actuator is pushed by a screw driver through the lower latch hole on the front plate of the oven cavity with the door opened in this condition the plunger of the monitor switch is pushed in the meter should indicate an
11. fan blade to the fan motor shaft according to the following procedure Hold the center of the bracket which supports the shaft of the fan motor on the flat table Apply the screw lock tight into the hole for shaft of the fan blade Install the fan blade to the shaft of fan motor by pushing the fan blade with a small light weight ball peen hammer or rubber mallet CAUTION Do not hit the fan blade strongly when installed because the bracket may be transformed Make sure that the fan blade rotates smooth after installed Make sure that the axis of the shaft is not slanted Install the fan motor assembly to the oven cavity by fitting the tabs of the fan duct into the holes of the oven cavity and the waveguide flange Re install the light mounting plate to the oven cavity with the one 1 screw Insert the end of the chassis support into the slit of the oven cavity rear cabinet Re install the chassis support to the oven cavity front plate with the one 1 screw Install the filament lead and the H V wire into the hole of the fan duct Re install the wire leads to the oven lamp to the hole of the fan duct Connect the wire leads to the fan motor referring to the pictorial diagram Groove joint pliers O Shaft 6 rO N T r i Shan A These are the positions Gap Axis FHH that sould be pinched Table C
12. switch shall prevent microwave radiation emission in excess of the requirement as above mentioned secondary interlock switch shall prevent microwave radiation emission in excess of 5 mW cm at any point 5cm or more from the external surface of the oven Y B Preparation for testing Before beginning the actual measurement of leakage proceed as follows 1 Make sure that the actual instrument is operating normally as specified in its instruction booklet Important Survey instruments that comply with the requirement for instrumentation as prescribed by the performance standard for microwave ovens 21 CFR 1030 10 c 3 i must be used for testing 2 Place the oven tray in the oven cavity 3 Place the load of 275 15 ml 9 8 oz of tap water initially at 20 5 C 68 F in the center of the oven cavity The water container shall be a low form of 600 ml 20 oz beaker with an inside diameter of approx 8 5 cm 3 1 2 in and made of an electrically nonconductive 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 Set the cooking control on Full Power Cooking Mode 5 Close the door and select a cook cycle of several minutes If the water begins to boil before the survey is completed replace it with 275 ml of cool water C Leakage test Closed door leakage test microwave measurement 1 Grasp the probe of
13. 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 gt 2 R 200BK R 200BW 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 severe possibly fatal electric shock Example High Voltage Capacitor Power Transformer Magnetron High Voltage Rectifier Assembly High Voltage Harness etc N Avoid possible exposure to microwave energy Please follow the instructions below before WARNING Operating the oven 1 Disconnect the power supply cord 4 The door is bent or warped 2 Visually check the door and cavity face plate for damage 5 There are defective parts in the door interlock system dents cracks signs of arcing etc 6 There are defective parts in the microwave generating i and transmission assembly Carry out any remedial work that is necessary before 7 There is visible damage to the oven operating the oven Do not operate the oven if any of the following conditions Do not operate the oven exist 1 Without the RF gasket Magnetron 1 Door does not close firmly 2 If the wave guide or oven cavi
14. the survey instrument and hold it perpendicular to the gap between the door and the body of the oven 2 Move the probe slowly not faster than 1 in sec 2 5 cm sec along the gap watching for the maximum indication on the meter 3 Check for leakage at the door screen sheet metal seams and other accessible positions where the continuity of the metal has been breached eg around the switches indicator and vents While testing for leakage around the door pull the door away from the front of the oven as far as is permitted by the closed latch assembly 4 Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater than 4mW cm and that the secondary interlock switch does turn the oven OFF before any door movement NOTE After servicing record data on service invoice and microwave leakage report SERVICE MANUAL SHARP MICROWAVE OVEN R 200BK R 200BW FOREWORD This Manual has been prepared to provide Sharp Electronics Corp Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVEN R 200BK R 200BW It is recommended that service personnel carefully study the entire text of this manual so that they will be qualified to render satisfactory customer service Check the interlock switches and the door seal carefully Special attention should be given to avoid electrical shock and microwave radiation hazard WARNING Never operate the oven until the following p
15. 18WRPO PCUSUA270WRPO UC A6 94WRF 0 C B FANJA02 9WREO D Fan duct Oven cavity Not replaceable part Leg Chassis support Cushion Q t Q m O A A ws PRA WNHHIOWCDMYIAOKRWNE PCOVPA27 6WREO PCOVPA342WREFO PCOVPA343WREFO PCUSUA443WRPO DUC A700WRFO Waveguide cover B cover Right B cover Left Cushion Air separator Flo PACGAO 97WREO RFA321WRTO KPA552WREO KPA551WREFO L A68 6WRRO PPA175WRFO O ring DOOR PARTS Door panel Door frame R 200BK Door frame R 200BW Door screen Latch head gt gt gt gt gt ply pp gt gt gt gt a 0 J0 S QO N N P RTA084WRE0 EPA622WREO GCOVHA3 90WRF 0 XCPSD40P08000 FROLPAO85WRKO atch spring Sealer film Choke cover Screw 4mm x 8mm MISCLANEOUS Turntable support NTNT A094WREO TINS A644WRRO TCAUAA145WRRO FW VZB655WREO urntable Instruction book Earth caution ain wire harness NO OO ON 1 gt Q N QW QZA150WREO TCAUAA1 6 6WRRO TCAUAA2 40WRRO TCAUAA2 3 9WRRO XFPSD40P08K00 X EZA042WREO LX WZA028WREO LX CZAO30WREO XHTSD40P08RVO High voltage wire B DHHS caution label Screw caution onitor caution SCREWS AND WASHERS Screw Special Special nia Screw 8mm XHPSD30P06000 XOTSD40P12RVO XOTSD40P12000 XOTSE40P08000 XOTSF40P08000 Screw 6mm Screw 12mm S
16. 2 Open the oven door and block it open 3 Remove the two 2 screws from the lower portion of the rear cabinet using a T20H Torx type or GTXH20 100 screw driver Screw Driver 4 Remove the remaining two 2 screws from rear and four DE oa 4 screws along the right and left side of outer case 20 5 Slide the entire outer case back out about 1 inch 3 cm Z to free it from retaining clips on the cavity face plate 6 Lift entire outer case from the unit 20 CAUTION 1 DISCONNECT OVEN FROM POWER SUP PLY BEFORE REMOVING OUTER CASE 2 DISCHARGE THE HIGH VOLTAGE CA PACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING R 200BK R 200BW NOTE When replacing the outer case the 2 special Torx screws must be reinstalled in the same locations MAGNETRON REMOVAL Disconnect the power supply cord and remove outer case Open the oven door and block it open Discharge high voltage capacitor Disconnect the wire leads from magnetron Remove the three 3 screws holding the magnetron to the waveguide OQ G IN 6 Remove the magnetron from waveguide 7 Now the magnetron is free CAUTION WHEN REPLACING THE MAGNETRON BE SURE THE R F GASKET IS IN PLACE AND THE MAGNETRON MOUNTING SCREWS ARE TIGHTENED SECURELY HIGH VOLTAGE COMPONENTS REMOVAL HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY To remove the components proceed as follows 1 Disconnect the power supply cord and r
17. ATION ALL RIGHTS RESERVED No part of this publication may be reproduced stored in a retrieval systems or transmitted in any form or by any means electronic mechanical pho tocopying recording or otherwise without prior written permission of the publisher 98 SHARP CORP 1S2 530E Printed in U S A
18. G 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 Whenstoring andtransporting thoroughly wrap them in aluminium foil Also wrap 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 approx 1M ohm Shapes of Electronic Components Transistor 2SA1267Y 2SC1740S DTA143ES DTC143ES B E C 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 theservicing powertothetouch controlpanelis 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 MI CROWAVE OVEN IS STILL LIVE DURING SERVIC ING AND PRESENTS A HAZARD Therefore before checking the performance of the touch control pan
19. H The monitor switch is activated the contacts opened by the latch head on the door while the door is closed The switch is intended to render the oven inoperative by means of blowing the C T fuse when the contacts of the primary interlock relay RY1 and secondary interlock switch fail to open when the door is opened Functions 1 When the door is opened the monitor switch contacts close to the ON condition due to their being normally closed At this time the primary interlock relay RY1 and secondary interlock switch are in the OFF condition contacts open due to its being normally open contact switches 2 As the door goes to a closed position the monitor switch contacts are first opened and then the door sensing switch and secondary interlock switch contacts close 3 If the door is opened and the primary interlock relay RY1 and the secondary interlock switch contact fail to open the C T fuse blows simultaneously with closing of the monitor switch contacts CAUTION BEFORE REPLACING A BLOWN C T FUSE TEST THE DOOR SENSING SWITCH PRI MARY INTERLOCK RELAY RY1 SECOND ARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER OPERATION RE FER TO CHAPTER TEST PROCEDURE NOTE C T FUSE AND MONITOR SWITCH ARE REPLACED AS AN ASSEMBLY R 200BK R 200BW TURNTABLE MOTOR The turntable motor rotates the turntable located on the bottom of the oven cavity so that the food on the turntable is cooked evenly The turnt
20. TCH D FAN MOTOR RECTIFIER MAGNETRON O O Figure O 1 Oven Schematic Off Condition 6 SCHEMATIC NOTE CONDITION OF OVEN 1 DOOR CLOSED 2 LIGHT UP DIAL ON C T FUSE MAGNETRON lAGNE THERMAL CUT OUT T PRIMARY INTERLOCK RELAY CONTROL UNIT DOOR SENSING SWITCH SECONDARY INTERLOCK SWITCH R 200BK R 200BW POWER TRANSFORMER MONITOR SWITCH MAGNETRON Figure O 2 Oven Schematic Cooking Condition DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM The door is opened by pulling the door refer to the Figure D 1 Latch Heads X Latch Hook Nf NS Door Sensing Switch ON Monitor Secondary Switch Door Interlock Switch Figure D 1 Door Open Mechanism DOOR SENSING AND SECONDARY INTERLOCK SWITCHES The secondary interlock switch is mounted in the lower position of the latch hook and the door sensing switch in the primary interlock system is mounted in the upper position of the latch hook They are activated by the latch heads on the door When the door is opened the switches interrupt the power to all high voltage components A cook cycle cannot take place until the door is firmly closed thereby activating both interlock switches The primary interlock system con sists of the door sensing switch and primary interlock relay located on the control circuit board MONITOR SWITC
21. able may turn in either direction COOLING FAN MOTOR The cooling 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 channelled through the oven cavity to remove steam and vapours given off from the heating foods It is then exhausted through the exhausting air vents at the oven cavity MAGNETRON THERMAL CUT OUT The thermal cut out located on the top of the oven cavity 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 257 F 125 C causing the oven to shut down C T FUSE 1 The C T fuse blows when the contacts COM NO of the primary interlock relay RY2 and secondary interlock switch remain closed with the oven door open and when the monitor switch closes 2 If the wire harness or electrical components are short circuited this C T fuse blows to prevent an electric shock or fire hazard 3 The C T fuse located on the top of the oven cavity is designed to prevent damage to the oven by fire If the food load is overcooked by either error in cook time or defect in the timer the C T fuse will open Under normal oper
22. aler Film and figure C 9 on how to handle the new film 5 Catch two 2 pins of door panel on two 2 hole of upper and lower oven hinges 6 Re install choke cover to door panel by pushing Note After any service to the door A Make sure that door sensing switch secondary interlock 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 4 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 Check for microwave leakage around door with an approved microwave survey meter Refer to Microwave Measurement Procedure Note The door ona microwave oven is designed to act as an electronic seal preventing the leakage of 25 R 200BK R 200BW microwave energy from oven cavity during cook cycle This function does not require that door be air tight moisture condensation tight or light tight 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 mic
23. anual before the oven is released to the owner e A microwave leakage check to verify compliance with the Federal Performance Standard should be performed on each oven prior to releasing oven to the owner BEFORE SERVICING Before servicing an operative unit perform a microwave emission check as per the Microwave Measurement Procedure outlined in this service manual If microwave emissions level is in excess of the specified limit contact SHARP ELECTRONICS CORPORATION immediately 1 800 237 4277 If the unit operates with the door open service person should 1 tell the user not to operate the oven and 2 contact SHARP ELECTRONICS CORPORATION and Food and Drug Administration s Center for Devices and Radiological Health immediately Service personnel should inform SHARP ELECTRONICS CORPORATION of any certified unit found with emissions in excess of 4mW cm The owner of the unit should be instructed not to use the unit until the oven has been brought into compliance R 200BK R 200BW WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of pro ducing very high voltage and current contact with following parts may result in a severe possibly fatal electrical shock Example High Voltage Capacitor High Voltage Power Trans former Magnetron High Voltage Rectifier Assem bly High Voltage Harness etc Read the Service Manual carefully and follow all instructions Before Servicing 1 Disc
24. ation the C T fuse remains closed However when abnormally high temperatures are reached within the oven cavity the C T fuse will open at 248 F 120 C causing the oven to shut down or when the electric currents beyond 13A flow the C T fuse will open TROUBLESHOOTING GUIDE Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected 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 IMPORTANT If the oven becomes inoperative because of a blown C T fuse check the monitor switch primary interlock relay RY1 door sensing switch and secondary interlock switch before replacing the C T fuse If C T fuse is replaced the monitor switch must also be replaced Use part FFS BAO20WRKO as an assembly IMPORTANT Wherever troubleshooting is performed with the power supply cord disconnected It may in some cases be necessary to connect the power supply cord after the outer case has been removed in this event Open the door and block it open Discharge high voltage capacitor O O1 GQ N When the testing is completed Open the door and block it open Discharge high voltage capacitor Reinstall the outer case cabinet
25. cord 7 Follow the troubleshooting guide given below for repair STEPS OCCURRENCE CAUSE OR CORRECTION 1 The rated AC voltage is not present between Check supply voltage and oven power cord Pin No 5 of the 3 pin connector A and the common terminal of the relay RY1 8 Disconnect the power supply cord and then remove outer case 9 Open the door and block it open 0 Discharge high voltage capacitor 11 Reconnect all leads removed from components during testing 12 Re install the outer case cabinet 13 Reconnect the power supply cord after the outer case is installed 14 Run the oven and check all function 15 R 200BK R 200BW CONTROL PANEL ASSEMBLY OUTLINE OF CONTROL PANEL Control Unit Control unit consists of LSI power source circuit synchro nizing signal circuit ACL circuit buzzer circuit encoder circuit and indicator circuit 1 LSI This LSI controls the encoder signal relay driving signal for oven function buzzer signal and LED signal 2 Power Source Circuit This circuit generates voltage necessary in the control unit Symbol Voltage Application VC 5 0V LSI I 1 VR pee 17 0V RELAY RY1 3 The voltage under the condition when all LEDs light up The voltage VR will vary according to the quantity of the LEDs which light up 3 Synchronizing Signal Circuit The power source synchronizing signal is available in order to compose a basic standard time in the clock
26. crew 12mm Screw 8mm R 200BW Screw 8mm R 200BK CoO 10 0 OY OQ1 i gt UN LX CZA071WREO s Torx tamper proof screw NSP BANH PORN OQ R 200BK R 200BW HOW TO ORDER REPLACEMENT PARTS To have your order filled promptly and correctly please furnish the following information 1 MODEL NUMBER 2 REF NO 3 PARTNO 4 DESCRIPTION Order Parts from the authorized SHARP parts Distributor for your area Defective parts required return should be returned as indicated in the Service Policy PACKING AND ACCESSORIES TOP PAD ASSEMBLY FPADBA375WRK0 DOOR PROTECTION SHEET SPADPA580WRE0 CABINET COVER TURNTABLE TRAY SPAKHA008WREO OPERATION MANUAL gt MICROWAVE OVEN BOTTOM PAD ASSEMBLY J FPADBA376WRK0 POLYETHYLENG BAG SSAKHA014WRE0 TURNRABLE SUPPORT woe INTO THE OVEN CAVITY PACKING CASE SPAKCD030WREO0 R 200BK SPAKCD031WREO R 200BW e Not replaceable items e TRAY PAD ASSY CPADBA244WRK0 31 R 200BK R 200BW OVEN AND CABINET PARTS TAB RY Ky 32 R 200BK R 200BW CONTROL PANEL PARTS DOOR PARTS MISCELLANEOUS Actual wire harness may be different than illustration 33 R 200BK R 200BW SHARP COPYRIGHT 1997 BY SHARP CORPOR
27. e if the high voltage capacitor is normal the meter will indicate continuity for a short time and should indicate an open circuit once the capacitor is charged If the above is not the case check the capacitor with an ohmmeter to see if it is shorted between either of the terminals and case If it is shorted replace the capacitor Reconnect all leads removed from components during testing Reinstall the outer case cabinet Reconnect the power supply cord after the outer case is installed Run the oven and check all functions Q N 00 Y O Ol MAGNETRON THERMAL CUT OUT TEST Disconnect the power supply cord and then remove outer case Open the door and block it open Discharge high voltage capacitor A continuity check across the thermal cut out terminals should indicate a closed circuit If the temperature of the magnetron reaches approximately 257 F 125 C the thermal cut out opens An open thermal cut out indicates overheating of the magnetron Check for restricted air flow to the magnetron especially the cooling fan air guide Reconnect all leads removed from components during testing Reinstall the outer case cabinet Reconnect the power supply cord after the outer case is installed Run the oven and check all functions CAUTION IF THE THERMAL CUT OUT INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE REPLACE THERMAL CUT OUT Q N CONDO SECONDARY INTERLOCK SWITCH TEST
28. ed to the A D converter in the LSI Connected to GND Terminal to change functions according to the model Signal in accordance with the model in operation is applied to set up its function Connected to GND A D converter power source voltage The power source voltage to drive the A D converter in the LSI No connection terminal Digit selection signal Signal is input to the anodes of the light emitting diodes LD1 LD5 Digit selection signal Signal is input to the anodes of the light emitting diodes LD6 LD10 Digit selection signal Signal is input to the anodes of the light emitting diodes LD11 LD15 Digit selection signal Signal is input to the anodes of the light emitting diodes LD16 LD20 No connection terminal Connected to VC Magnetron high voltage circuit oven lamp turntable motor and fan motor driving signal Square Waveform 60Hz 16 7 msec To turn on and off the relay RY1 In 100 POWER operation the signals hold L level during microwave cook ing and H level while not cooking During cooking Reference voltage input terminal A reference voltage is applied to the A D converter in the LSI Connected to GND Power source voltage 0V The power source voltage to drive the LSI is input to VSS terminal Connected to GND Segment data signal Signal is input to the cathodes of the light emitting diode
29. eeeessnaaeens 20 RICTORIALDIAG RAM uuu tes oles y A A AE AA ENE 26 CONTROL PANEL GIRCUIT acs 2 L uu nN A A uay Qui a aout catia ia 27 PRINTED WIRING BOARD viciosa ti cca casted anaq aus A A LA Aina 28 PARTS EIS Ti A 200 0 ERA BI E AA qa a Cole be NG Mieco du w Qa aaa A 29 PACKING AND ACCESSORIES vuitton bag 31 This document has been published to be used for after SHARP CORPORATION sales service only The contents are subject to change without notice R 200BK R 200BW PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY a Do not operate or allow the oven to be operated with the door open b Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source and make repairs as necessary 1 interlock operation 2 proper door closing 3 seal and sealing surfaces arcing wear and other damage 4 damage to or loosening of hinges and latches 5 evidence of dropping or abuse c Before turning on microwave power for any service test or inspection within the microwave generating compartments check the magnetron wave guide or transmission line and cavity for proper alignment integrity and connections d Any defective or misadjusted components in the interlock monitor door seal and microwave generation and transmission systems shall be repaired replaced or adjusted by procedures described in this m
30. el 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Disconnect the leads to the primary of the power transformer 5 Ensure that these leads remain isolated from other components and oven chassis by using insulation tape 6 After that procedure re connect the power supply cord After checking the performance of the touch control panel 1 Disconnect the power supply cord 2 Open the door and block it open 3 Re connect the leads to the primary of the power transformer 4 Re install the outer case cabinet 19 5 Re connect the power supply cord after the outer case is installed 6 Run the oven and check all function 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 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 must short both ends of the door sensing switch on PWB of the touch control panel with a jumper which br
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32. emove outer case 2 Open the oven door and block it open 3 Discharge high voltage capacitor 4 Remove one 1 screw holding capacitor holder to rear cabinet Disconnect the H V wire of the H V rectifier assembly from the magnetron 6 Disconnect the filament lead of the power transformer from the H V capacitor 7 Remove one 1 screw holding ground side terminal of high voltage rectifier assembly and remove capacitor holder al 8 Disconnect all the leads and terminals of high voltage rectifier assembly from high voltage capacitor 9 Now the H V rectifier assembly and H V capacitor should be free CAUTION WHEN REPLACING HIGH VOLTAGE RECTI FIER ASSEMBLY ENSURE THAT THE CATH ODE GROUND CONNECTION IS SE CURELY FIXED TO THE CAPACITOR HOLDER WITH A GROUNDING SCREW CAUTION DO NOT REPLACE ONLY HIGH VOLTAGE RECTIFIER WHEN REPLACING IT RE PLACE HIGH VOLTAGE RECTIFIER ASSEM BLY POWER TRANSFORMER REMOVAL 1 Disconnect the power supply cord and remove outer case 2 Open the oven door and block it open 3 Discharge high voltage capacitor 4 Disconnect the wire leads main wire harness and H V wire from power transformer 5 Disconnect the lead from magnetron filament 6 Disconnect the lead of the power transformer from high voltage capacitor 7 Remove the two 2 screws holding the transformer to bottom plate 8 Remove the transformer 9 Now the power transformer is free Re install 1 Re
33. enter of gt wi iers E ki Bracket Rotor sah LY p brac et Rotor M Z Rear View Side View DOOR SENSING SWITCH SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL Q N al Disconnect the power supply cord and remove outer case Open the door and block it open Discharge high voltage capacitor Disconnect wire leads from the switches and control panel Remove the control panel assembly from the oven cavity front flange Refer to chapter CONTROL PANEL ASSEMBLY REMOVAL 6 7 8 Remove two 2 screws holding latch hook to oven flange Remove latch hook assembly from oven flange To remove the secondary interlock switch 8 1 Pull out the secondary interlock switch from the latch 23 hook by pushing outward on the tab that is holding the switch But the switch will be caught by the bar of the latch hook R 200BK R 200BW 8 2 Then pull out the switch while pushing the plunger of the switch again 8 3 Now the secondary interlock switch is free 9 To remove the monitor switch or door sensing switch 9 1 Push outward on the tab that is holding the switch then pull the switch upward 9 2 Pull out the switch from the latch hook Do not break the pole or tab of the latch hook 9 3 Now the switch is free Re install 1 Re install each switch in its place The secondary interlock switch is in the lower position and the monitor switch is in the middle position The door sen
34. er electric components function COOKING Oven does not go into cook cycle when Light Up Dial is turned CONDITION Oven seems to be operating but little or no heat is produced in oven load Food incompletely cooked or not cooked at all at end of cook cycle Oven goes into a cook cycle but ex tremely uneven heating is produced in oven load food PROCEDURE LETTER A Oven lamp turntable motor and fan mo tor do not operate TEST PROCEDURES MAGNETRON ASSEMBLY TEST PON gt COMPONENT TEST Disconnect the power supply cord and then remove outer case Open the door and block it open Discharge high voltage capacitor To test for an open filament isolate the magnetron from the high voltage circuit A continuity check across the magnetron filament leads should indicate less than 1 ohm al To test for a shorted magnetron connect the ohmmeter leads between the magnetron filament leads and chassis ground This test should indicate an infinite resistance If there is little or no resistance the magnetron is grounded and must be replaced Reconnect all leads removed from components during testing Reinstall the outer case cabinet Reconnect the power supply cord after the outer case is installed Run the oven and check all functions O OND MICROWAVE OUTPUT POWER The following test procedure should be carried out with the microwave oven in a f
35. er the outer case is installed 7 Run the oven and check all function ROP o a After repairing 1 Reconnect all leads removed from components during testing 2 Reinstall the outer case cabinet 3 Reconnectthe power supply cord after the outer case is installed 4 Run the oven and 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 power to HIGH and set the microwave timer for two 2 minutes When the two minutes has elapsed timer at zero carefully check that the water is now hot If the water remains cold carry out Before Servicing procedure and re examine the connections to the component being tested 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 R 200BK R 200BW MICROWAVE MEASUREMENT PROCEDURE A Requirements 1 Microwave leakage limit Power density limit The power density of microwave radiation emitted by a microwave oven should not exceed 1mW cm at any point 5cm or more from the external surface of the oven measured prior to acquisition by a purchaser and thereafter through the useful life of the oven 5 mW cm at any point 5cm or more from the external surface of the oven Safety interlock switches Primary interlock relay and door sensing
36. ern added to the primary on the PWB this foil pattern acts as a fuse 1 Foil pattern check and repairs 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Follow the troubleshooting guide given below for repair STEPS OCCURRENCE CAUSE OR CORRECTION 1 Only pattern at a is broken Insert jumper wire J1 and solder 2 Pattern at a and b are broken Insert the coil RCILF2003YAZZ between c and d 5 Make a visual inspection of the varistor Check for burned damage ORG LAW Ad W A al 14 R 200BK R 200BW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 6 Reconnect all leads removed from components during testing 7 Re install the outer case cabinet 8 Reconnect the power supply cord after the outer case is installed 9 Run the oven and check all function 2 Follow the troubleshooting guide given below if indicator does not light up after above check and repairs are finished 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Disconnect the leads to the primary of the power transformer 5 Ensure that these leads remain isolated from other components and oven chassis by using insulation tape 6 After that procedure re connect the power supply
37. ese leads remain isolated from other components and oven chassis by using insulation tape After that procedure re connect the power supply cord Remove the outer case and check voltage between Pin No 5 of the 3 pin connector A and the common terminal of the relay RY1 on the control unit with an A C voltmeter The meter should indicate 120 volts if not check oven circuit RY1 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 Oven lamp Turntable motor Cooling fan motor Power transformer OQ GQ N NO RY1 gt Approx 17 0V D C t The voltage under the condition when all LEDs light up 8 Disconnect the power supply cord and then remove outer case 9 Open the door and block it open 10 Discharge high voltage capacitor 11 Reconnect all leads removed from components during testing 12 Re install the outer case cabinet 13 Reconnect the power supply cord after the outer case is installed 14 Run the oven and check all function FOIL PATTERN ON THE PRINTED WIRING BOARD TEST To protect the electronic circuits this model is provided with a fine foil patt
38. ings 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 the 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 itis 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 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 DC 10MHz type or more advanced model 3 Others Hand tools Other Precautions 1 Before turning on the power source of the control unit remove the aluminium foil applied for preventing static electricity Connect the connector of the key unit to the control unit being sure that the lead wires are not twisted After aluminium foil is removed be careful
39. ischarge high voltage capacitor 4 Disconnect the leads to the primary of the power transformer 5 Ensure that these leads remain isolated from other components and oven chassis by using insulation tape 6 After that procedure re connect the power supply cord 1 Control Panel The following symptoms indicate a defective control unit 1 1 In connection with LEDs a At a certain LED all or some LEDs do not light up b At a certain LED brightness is low c Only one LED does not light up d All or some LEDs continue to light up e Acertain group of LEDs do not light up f The LEDs flicker 1 2 Other possible troubles caused by defective control unit a Buzzer does not sound or continues to sound b Clock is not possible c Cooking time can not be set When testing is completed 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Reconnect all leads removed from components during testing 5 Re install the outer case cabinet 6 Reconnect the power supply cord after the outer case is installed 7 Run the oven and check all function 13 R 200BK R 200BW PROCEDURE LETTER J TEST PROCEDURES COMPONENT TEST RELAY TEST Disconnect the power supply cord and then remove outer case Open the door and block it open Discharge high voltage capacitor Disconnect the leads to the primary of the power transformer Ensure that th
40. ivates door sensing switch and second ary interlock switch In this condition the monitor switch contacts are opened When oven is plugged in 120 volts A C is supplied to the control unit Figure O 1 COOKING CONDITION When the Light Up Dial is turned the following operations occur 1 The contacts of the relay are closed and components connected to the relay are turned on as follows For details refer to Figure O 2 RELAY RY 1 CONNECTED COMPONENTS oven lamp turntable motor fan motor power transformer 120 volts A C is supplied to the primary winding of the power transformer and is converted to about 3 5 volts A C output on the filament winding and approximately 2000 volts A C on the high voltage winding The filament winding voltage heats the magnetron filament and the H V winding voltage is sent to a voltage doubler circuit The microwave energy produced by the magnetron is channelled through the waveguide into the cavity feed SCHEMATIC NOTE CONDITION OF OVEN 1 LIGHT UP DIAL OFF 2 DOOR CLOSED C T FUSE MAGNETRON IAGNE THERMAL CUT OUT box and then into the cavity where the food is placed to be cooked Upon completion of the cooking time the power transformer oven lamp etc are turned off and the generation of microwave energy is stopped The oven will revert to the OFF condition When the door is opened during a cook cycle monitor switch door sensing
41. minals should indicate a closed circuit unless the temperature of the C T fuse reaches approximately 248 F 120 C An open C T fuse indicates the oven overheated Replace the oven C T fuse and check the inside of the oven cavity the proper setting of cooking time and the proper operation of control unit Also check for proper air flow through the ovens venting system Especially check the cooling fan for proper operation and the air guide for restriction CAUTION IF THE C T FUSE INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE REPLACE THE C T FUSE Reconnect all leads removed from components during testing Reinstall the outer case cabinet Reconnect the power supply cord after the outer case is installed Run the oven and check all functions ONAN l CONTROL PANEL ASSEMBLY TEST WARNING Do not touch the electrical parts and the printed wiring board to prevent an electric shock Because the control unit is TRANSLESS CIRCUIR and many electrical parts are used at A C line voltage The 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 troubleshooting by unit replacement is described according to the symptoms indicated Before testing 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 D
42. nt lead of the power transformer and the H V wire from the fan duct Remove the one 1 screw holding the light mounting plate to the oven cavity Release the wire leads to the oven lamp from the hole of the fan duct 10 Release the fan motor assembly from the oven cavity 11 Remove the fan blade from the fan motor shaft according to the following procedure 12 Hold the edge of the rotor of the fan motor by using a pair of groove 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 easy to be 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 13 Remove the fan blade assembly from the shaft of the fan motor by pulling and rotating the fan blade with your hand 14 Now the fan blade will be free Stator CAUTION Do not re use the removed fan blade because the hole for shaft may be larger than normal Coil fl fel 15 16 Remove the two 2 screws holding the fan motor to the fan duct Now the fan motor is free INSTALLATION 1 2 10 11 Install the fan motor to the fan duct with the two 2 screws Install the
43. oints 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 personnel DANGER Certain initial parts are intentionally not grounded and present a risk of electrical shock only during servicing Service personnel Do not contact the following parts while the appliance is energized High Voltage Capacitor Power Transformer Magnetron High Voltage Rectifier Assembly High Voltage Harness If provided Vent Hood Fan assembly Cooling Fan Motor Allthe parts marked on parts list are used at voltages more than 250V Removal of the outer wrap gives access to voltage above 250V All the parts marked A on parts list may cause undue microwave exposure by themselves or when they are damaged loosened or removed SHARP ELECTRONICS CORPORATION SHARP PLAZA MAHWAH NEW JERSEY 07430 2135 R 200BK R 200BW PRODUCT DESCRIPTION GENERAL INFORMATION OPERATION TROUBLESHOOTING GUIDE AND TEST PROCEDURE TOUCH CONTROL PANEL COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WIRING DIAGRAM PARTS LIST R 200BK R 200BW PRODUCT DESCRIPTION SPECIFICATIONS ITEM DESCRIPTION Power Requirements 120 Volts 60 Hertz Single phase 3 wire grounded Power Cons
44. onnect the power supply cord Z and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor WARNING RISK OF ELECTRIC SHOCK DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE SERVICING The high voltage capacitor remains charged about 60 seconds after the oven has been switched off Wait for 60 seconds andthen short circuit the connection ofthe high voltage capacitor that is the connecting lead of the high voltage rectifier against the chassis with the use of an insulated screwdriver Wherever troubleshooting is performed the power supply must be disconnected It may in some cases be necessary to connect the power supply after the outer case has been removed in this event 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Disconnect the leads to the primary of the power transformer 5 Ensure that the leads remain isolated from other components and oven chassis by using insulation tape 6 After that procedure reconnect the power supply cord Don t Touch Danger High Voltage When the testing is completed 1 Disconnect the power supply cord and then remove outer case Open the door and block it open Discharge high voltage capacitor Reconnect the leads to the primary of the power transformer Reinstall the outer case cabinet Reconnect the power supply cord aft
45. open circuit If improper operation is indicated the switch may be defective After testing the monitor switch reconnect the wire lead to the monitor switch COM terminal and check the continuity of the monitor circuit Reconnect all leads removed from components during testing Reinstall the outer case cabinet Reconnect the power supply cord after the outer case is installed Run the oven and check all functions SCREW DRIVER OHMMETER BLOWN C T FUSE TEST Q N Disconnect the power supply cord and then remove outer case Open the door and block it open Discharge high voltage capacitor Ifthe C T fuse is blown when the door is opened check the primary interlock relay secondary interlock switch and monitor switch according to the TEST PROCEDURE for those switches before replacing the blown C T fuse CAUTION BEFORE REPLACING A BLOWN C T FUSE TEST THE PRIMARY INTERLOCK RELAY SECONDARY INTERLOCK SWITCH DOOR SENSING SWITCH AND MONITOR SWITCH FOR PROPER OPERATION 12 R 200BK R 200BW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST If the C T fuse is blown by improper switch operation the C T fuse and monitor switch must be replaced with C T fuse and monitor switch assembly part number FFS BAO20WRKO even if the monitor switch operates normally The C T fuse and monitor switch assembly is comprised of a 13 ampere fuse and switch Acontinuity check across the C T fuse ter
46. r temperature The normal result should be 15 to 28 F 8 3 to 15 6 C rise in temperature If the water temperatures are accurately measured and tested for the required time period the test results will indicate if the magnetron tube has low power output low rise in water temperature which would extend cooking time or high power output high rise in water temperature which would reduce cooking time Because cooking time can be adjusted to compensate for power output the magnetron tube assembly should be replaced only if the water temperature rise test indicates a power output well beyond the normal limits The test is only accurate if the power supply line voltage is 120 volts and the oven cavity is clean POWER TRANSFORMER TEST Disconnect the power supply cord and then remove outer case Open the door and block it open Discharge high voltage capacitor Disconnect the primary input terminals and measure the resistance of the transformer with an ohmmeter Check for continuity of the coils with an ohmmeter On the R x 1 scale the resistance of the primary coil should be less than 1 ohm and the resistance of the high voltage coil should be approximately 164 ohms the resistance of the filament coil should be less than 1 ohm Reconnect all leads removed from components during testing Reinstall the outer case cabinet Reconnect the power supply cord after the outer case is installed Run the oven and check all functions
47. rowave energy from oven cavity Hinge RN ZZ Door Panel EERE lt lt Hinge FIG IRR 77 Choke Cover Pin Oven Hinge J Figure C 8 Door Replacement SEALER FILM Installation 1 Put the adhesive tape on the backing film of the sealer film as shown in Fig C 9 2 Tear the backing film by pulling the adhesive tape 3 Put the pasted side of the sealer film on the door panel Sealer film lt Backing film Adhesive tape Figure C 9 Sealer film R 200BK R 200BW YAWYOSASNVYL YAMOd ATEaVLNYNL WO ON HO LIMS A90783 1NI AYVGNOOSS NOYLINDVAN HOLIMS YOLINOW ON SLNINOAMNO9 ADVLIOA HOIH g3l411934 NH AV 13qd A90 143 1NI AYVINIdd DyO 14 A YOLOW NY4 Fe kos V NO TOTI SHIHNSVN gt TANVd TOHINOD pioo jddns u mod ay uo yew uN YUM euru ey 0 pajosuuoo aq snu m IHM feamau ul ALON ZHO9 A0Z L 134905 8 GHOO AlddNS YAMOd dY NJAO g THI HOLINS SNISN3S yen enig oe yeyoos 4f 1461 1d y u AO y UO yew ana yum asna 1 9 q sk
48. s LD1 LD6 LD11 and LD16 Segment data signal Signal is input to the cathodes of the light emitting diodes LD1 LD2 LD6 LD7 LD12 LD16 and LD17 Segment data signal Signal is input to the cathodes of the light emitting diodes LD1 LD3 LD6 LD8 LD11 LD13 LD16 LD17 and LD18 R 200BK R 200BW Signal WO Description 22 D5 OUT Segment data signal Signal is input to the cathodes of the light emitting diodes LD1 LD4 LD6 LD9 LD11 LD14 LD16 LD18 and LD19 OUT Segment data signal Signal is input to the cathodes of all light emitting diodes LD1 D20 No connection terminal Input signal which communicates the door open close information to LSI Door closed L level signal Door opened H level signal Connected to CNTR Terminal not used Signal coming from encoder Signal similar to INT Pulse signals are input into F3 No connection terminal Internal clock oscillation frequency control output Output to control oscillation input of XOUT Internal clock oscillation frequency input setting The internal clock frequency is set by inserting the ceramic filter oscillation circuit with respect to XIN terminal Signal to sound buzzer A Completion sound H VO 5V Power source voltage 5 0V The power source voltage to drive the LSI is input to VDD terminal 18 R 200BK R 200BW SERVICIN
49. sing switch is in the upper position 2 Re connect wire leads to each switch Refer to chapter Pictorial Diagram 3 Secure latch hook with two 2 mounting screws to oven flange 4 Re install the control panel assembly to the oven cavity front flange 5 Re connect wire leads to the control unit Refer to chapter Pictorial Diagram 6 Make sure that monitor switch is operating properly and check continuity of the monitor circuit Refer to chapter Test Procedure and Adjustment Procedure below Latch Hook Door Pole 2 Sensing 0 Switch so Pole ae Monitor Switch ae Tab Secondary 4 Interlock Bar Switch Af Tab Quy Varo Figure C 5 Latch Switch Removal DOOR SENSING SWITCH SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT 1 Disconnect the power supply cord and remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor If the door sensing switch secondary interlock switch and monitor switch do not operate properly due to a misadjustment the following adjustment should be made 4 Loosen the two 2 screws holding the latch hook to the flange of the oven front face 5 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 ofthe latch hook should be adjusted so that the monitor switch is acti
50. sonal responsibility and obligation of the customer to contact a qualified electrician and have it replaced with a properly grounded three pronged wall receptacle or have a grounding adapter properly grounded and polarized If the extension cord must be used it should be a 3 wire 15 amp or higher rated cord Do not drape over a countertop or table where it can be pulled on by children or tripped over accidentally CAUTION DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE ROUND GROUNDING PRONG FROM THIS PLUG 3 Pronged Plug Grounded Receptacle Box Grounding Pin 3 Pronged Receptacle O00 q O OY GO PO gt Oven door with see through window Safety door latches Door hinges Door seals and sealing surfaces Turntable motor shaft Removable turntable support Removable turntable Ventilation openings Rear Oven lamp 10 Wave guide cover 11 Power supply cord OVEN DIAGRAM CONTROL PANEL fy BAKED POTATO ww COOK 1 medium 4 5min FRESH VEGETABLES COOK 2 cups 6 8min POPCORN POP 3 5 oz bag 3 4min ott Up Diay DINNER PLATE REHEAT 4min SOUP we REHEAT 1 cup 4 5min ROLL MUFFIN REHEAT 1 medium 20sec DEFROST Check chart in Operation Manual R 200BK R 200BW R 200BK R 200BW OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during oven operation OFF CONDITION Closing the door act
51. st transformer on the bottom plate with its primary terminals toward the oven face plate 2 Secure transformer with two 2 screws to the bottom plate 3 Re connect wire leads primary and high voltage and filament leads to the power transformer magnetron and high voltage capacitor referring to Pictorial Diagram 4 Re install outer case and check thatthe oven is operating properly OVEN LAMP AND LAMP SOCKET REMOVAL 1 Disconnect the power supply cord and remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Pull the wire leads from the oven lamp socket by pushing the terminal hole of the oven lamp socket with the flat type small screw driver 5 Tear the cushion from the light mount plate 6 Bend the tab of the light mount plate holding the oven 7 Lift up the oven lamp socket 8 Now the oven lamp socket is free Oven lamp socket LZ Q 7 Flate type small screw driver Figure C 1 Oven lamp socket R 200BK R 200BW OQ GQ N POSITIVE LOCK CONNECTOR NO CASE TYPE REMOVAL Disconnect the power supply cord and remove outer case Open the door and block it open Discharge high voltage capacitor Push the lever of positive lock connector Pull down on the positive lock connector CAUTION WHEN CONNECTING THE POSITIVE LOCK OQ GQ N CONNECTORS TO THE TERMINALS IN STALL THE POSITIVE LOCK SO THAT THE LEVER FACES YOU
52. switch secondary interlock switch and primary interlock relay RY1 are activated with the following results The circuits to the oven lamp turntable motor the cooling fan motor and the high voltage components are de energized and the Light Up Dial indicates the time still remaining in the cook cycle when the door was opened The monitor switch is electrically monitoring the operation of the primary interlock relay RY1 and the secondary interlock switch and is mechanically associated with the door so that it will function in the following sequence 1 When the door opens from the closed position the secondary interlock switch door sensing switch and primary interlock relay RY 1 open their contacts Then the monitor switch contacts close When the door is closed from the open position the monitor switch contacts open first Then the contacts of the secondary interlock switch and door sensing switch close If the secondary interlock switch and primary interlock relay RY 1 fail with the contacts closed when the door is opened the closing of the monitor switch contacts will form a short circuit through the C T fuse and primary interlock relay RY1 causing the C T fuse to blow POWER TRANSFORMER 13 Toa RY 1 PRIMARY INTERLOCK RELAY CONTROL UNIT 120V AC 60 Hz DOOR SENSING SWITCH SECONDARY INTERLOCK SWITCH O NE D MONITOR SWI
53. tments DOOR REPLACEMENT REMOVAL 1 Disconnect the power supply cord 2 Open the door slightly 3 Insert a putty knife thickness of about 0 5mm into the gap between the choke cover and corner portion of door panel as shown in Figure C 7 to free engaging parts 4 Pry the principles of the lever and lift up the choke cover by inserting a putty knife in order shown in figure C 7 5 Release choke cover from door panel 6 Now choke cover is free Door Frame Figure C 7 Door Disassembly 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 is free from oven cavity 9 Release door panel from ten 10 tabs of door frame and remove door frame by sliding the door panel downward 10 Now door panel with sealer film is free 11 Tear sealer film from door panel 12 Now door panel is free 13 Slide latch head upward and remove it from door frame with releasing latch spring from door frame and latch head 14 Now latch head and latch spring are free 15 Remove door screen from door frame 16 Now door screen is free RE INSTALL 1 Re install door screen to door frame 2 Re install latch spring to the head Re install latch spring to the door frame Re install latch head to the door frame 3 Re install door panel to door frame by fitting ten 10 tabs of door frame to ten 10 holes of door panel Put sealer film on door panel Refer to Se
54. tor 1 0 Transistor DTA143 VRD B12EF102J VRD B12EF472J VRD B12HF104J VRS L63DA101J VRD B12EF472J Resistor 1 0 Resistor Resistor Resistor Resistor VRD B12EF472J VRD B12EF473J VRD B12EF472J VRD B12EF102J Resistor Resistor Resistor Resistor R 200BK R 200BW Ref No patio ___pescriprion _faty core RD B12EF332J RD B12EF104J RD B12EF472J RD B12EF431J RD B12EF331J Resistor 3 3k Resistor 100k Resistor 4 7k Resistor 430 RD B12EF241J RD B12EF151J RD B12EF101J RLY A110DR LM A014DR D Resistor 240 Resistor 150 Resistor 100 Relay OMIF S 124LM Buzzer PKM22EPT oh Resistor 330 0 VR BA018WR VZA032DR Rotary encoder Varistor 10G471K Z12A1 Z6C3 Zener diod H2Z12A1 Zener diod HZ6C3 m m m Z4C3 Zener diod HZ4C3 LCB438WR LCB440WR AA100WR LCAUAA156WR XEPSD30P08XS0 Jj m lt lt lt Z JJ ZJ lt lt lt lt lt lt lt lt OQ g rg r D C y HOK A105WRF0 LANGQA477WRWO PCUSUADO2WRPO LBNDKA038WRP0 Control panel R 200BK Control panel R 200BW User Caution label R 200BK User Caution label R 200BW Screw 3mm X 8mm OVEN PARTS Latch hook Light mount plate Waterproof cushion Capacitor holder Fan blade WRRPEFPHBPNNFPHRPRPRPRPHRFENDN WOKE od P GLEGPA073WREO LANGTA3
55. ty are not intact 2 Door hinge support or latch hook is damaged 3 If the door is not closed B The door gasket or seal is damaged 4 If the outer case cabinet is not fitted WARNING FOR WIRING To prevent an electric shock take the following pre 3 Sharp edge cautions Bottom plate Oven cavity Waveguide flange 1 Before wiring Chassis support and other metallic plate 1 Disconnect the power supply cord 4 Movable parts to prevent a fault 2 Open the door and block it open Fan blade Fan motor Switch Switch lever Open 3 Discharge the high voltage capacitor and wait for 60 button seconds 3 Do not catch the wire leads in the outer case cabinet 2 Don t let the wire leads touch to the followiong parts 4 Insert the positive lock connector until its pin is locked 1 High voltage parts and make sure that the wire leads do not come off even Magnetron High voltage transformer High voltage if the wire leads are pulled capacitor and High voltage rectifier assembly 5 To prevent an error function connect the wire leads 2 Hot parts correctly referring to the Pictorial Diagram Oven lamp Magnetron High voltage transformer and Oven cavity Please refer to OVEN PARTS CABINET PARTS CONTROL PANAL PARTS DOOR PARTS when carrying out any of the following removal procedures OUTER CASE REMOVAL To remove the outer case procedure as follows 1 Disconnect the power supply cord
56. ully assembled condition outer case fitted R 200BK R 200BW PROCEDURE LETTER TEST PROCEDURES COMPONENT TEST HIGH VOLTAGES ARE PRESENT DURING THE COOK CYCLE SO EXTREME CAUTION SHOULD BE OBSERVED Power output of the magnetron can be measured by performing a water temperature rise test This test should only be used if above tests do notindicate a faulty magnetron and there is no defect in the following components or wiring silicon rectifier high voltage capacitor and power transformer This test will require a 16 ounce 453cc measuring cup and an accurate mercury thermometer or thermocouple type temperature tester For accurate results the following procedure must be followed carefully 1 Fillthe measuring cup with 16 oz 453cc of tap water and measure the temperature of the water with a thermometer or thermocouple temperature tester Stir the thermometer or thermocouple through the water until the temperature stabilizes Record the temperature of the water 2 Place the cup of water in the oven Operate oven at POWER 10 HIGH selecting more than 60 seconds cook time Allow the water to heat for 60 seconds measuring with a stop watch second hand of a watch or the digital read out countdown 3 Remove the cup from the oven and again measure the temperature making sure to stir the thermometer or thermocouple through the water until the maximum temperature is recorded 4 Subtract the cold water temperature from the hot wate
57. umption 1030W Approx 9 0 Amperes Power Output 600 W nominal of RF microwave energy IEC 705 Test procedure Operating frequency 2450 MHz Case Dimensions Width 18 1 8 Height 1 1 3 8 Depth 14 5 8 Cooking Cavity Dimensions Width 12 3 8 0 7 Cubic feet Height 7 7 8 Depth 12 5 8 Control Complement Light up dial timer 15 minutes No cooking control Oven Cavity Light Yes Safety Standard UL Listed FCC Authorized DHHS Rules CFR Title 21 Chapter 1 Subchapter J GENERAL INFORMATION GROUNDING INSTRUCTIONS This oven is equipped with a three prong grounding plug It must be plugged into a wall receptacle that is properly installed and grounded in accordance with the National Electrical Code and local codes and ordinances In the event of an electrical short circuit grounding reduces the risk of electric shock by providing an escape wire for the electric current WARNING Improper use of the grounding plug can result in a risk of electric shock Electrical Requirements The electrical requirements are a 115 120 volt 60 Hz AC only 15 or 20 amp fused electrical supply It is recommended that a separate circuit serving only this appliance be provided When installing this appliance observe all applicable codes and ordinances A short power supply cord is provided to reduce risks of becoming entangled in or tripping over a longer cord Where a two pronged wall receptacle is encountered it is the per
58. vated with the door closed The vertical position of the latch hook should be adjusted so that the door sensing switch and the secondary interlock switch are activated with the door closed Secure the screws firmly Check the operation of all switches If each switch has not activated with the door closed loosen screw and adjust the latch hook position NO After adjustment make sure of the following 1 In and out play of the 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 door toward the oven face Both results play in the door should be less than 0 5mm 2 The door sensing switch and secondary interlock switch interrupt the circuit before the door can be opened 3 The monitor switch contacts close when the door is opened 4 The contacts of door sensing switch and secondary interlock switch open within 1 6mm gap between right side of cavity face plate and door when door is open 5 Re install outer case and check for microwave leakage around the door with an approved microwave survey meter Refer to Microwave Measurement Procedure Latch Heads gt Latch Hook Bene S LA Door Sensing Switch SS Monitor Secondary Switch Door Interlock Switch gt gt Figure C 6 Latch Switch Adjus
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