R-590BK R-590BW SHARF? SERVICE MANUAL S68M116R590BE MICROWAVE OVEN MODELS R-590BKlR-590BW In the interest of user-safety the oven is to be restored to its original condition and only the parts identical to those specified should be used. WARNING TO SERVICE PERSONNEL: Microwave ovens contain circuitry capable of producing very high voltage and current. Contact with the following parts may result in a severe, possibly fatal electrical shock.
R-590BK R-590BW (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.
m R-590BK R-590BW SERVICE MANUAL Microwave Ovens Specifications R=590BK/R=590BW Foreword General Information This manual has been prepared to provide Sharp Electronics Corporation personnel with complete operation and service information for Sharp microwave oven models R-590BWR-590BW. It is recommended that service personnel carefully study the entire text of this manual so they will be qualified to render satisfactory customer service. Check interlock switches and the door seal carefully.
R-590BK R-590BW WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of producing 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 Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc.. Read the Service Manual carefully and follow all instructions. oltage Before Servicing When the testing is completed 1.
R-590BK R-590BW Item Description Power Requirements 120 Volts 14.0 Amperes 1650 Watts 60 Hertz Single phase, 3 wire grounded Power Output 1100 watts (IEC-705 Test Procedure) Operating frequency of 2450 MHz Case Dimensions Width 23.94” Height 13.27” (including Depth 19” feet) Cooking Cavity 1.8 Cu.Ft. Width 17” Height 9.96” Depth 17.8” Tray Size 16” Diameter Control Complement Touch Control System Clock (I:00 - 1259) Timer (0 - 99 min. 99 sec.
R-590BK R-590BW Grounding Instructions This oven must be fully grounded at all times. This appliance must be connected to a 120 volt, 60 Hz, AC only, 15 Ampere or more 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. Grounded Receptacle 3 Pronged WARNING: Improper use of the grounding plug can result in a risk of electric shock.
R-590BK R-590BW Touch Control Panel Time of day and date During setting “Reminder “, this mark is displayed 1 Big LCD display Selection button: When the selection arrow are displayed on the screen, you can select pressing these buttons. ---I Reminder mark: Page turn button: When forward/ Rewind/ Return arrows are displayed on the screen, -.
R-590BK R-590BW OPERATION Description of Operating Sequence The following is a description during oven operation: of component feed-box and into the cavity where the food is cooked. 5 . Upon completion of the cooking cycle, the power transformer, oven lamp and cooling fan are turned off and the generation of microwave energy is terminated. 6 .
R-590BK R-590BW OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description during oven operation. of component functions Sensor Cooking Condition When using the Sensor Cooking function (Sensor Cooking , the foods are cooked without figuring time, power level or quantity. When the oven senses enough steam from the food, it relays the information to its microprocessor which will calculate the remaining cooking time and the power level needed for best results.
R-590BK R-590BW DESCRIPTION AND FUNCTION OF COMPONENTS Cooling Fan Motor Monitor Switch The cooling fan motor drives a blade which draws external cool air. This cool air is directed through the air vanes surrounding the magnetron to cool the magnetron. This air is channeled through the oven cavity to remove steam and vapors given off from the heating foods. It is then exhausted through exhaust vents in the oven cavity.
R-590BK R-590BW SERVICING 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. Before replacing a blown monitor fuse, test the door sensing switch, primary interlock relay, secondary interlock switch and monitor switch for proper operation.
R-590BK R-590BW Troubleshooting Guide Cook Condition Possible Cause Problem 3ven lamp does not light at all. Shorted or open wiring Check or replace Oven lamp or socket Check or replace Control unit [>ven lamp lights, but fan motor and turntable motor do not operate. Dven does not go into cook cycle Nhen START button is touched. &en seems to be operating but little or no heat is produced in oven road. (incompletely cooked or not zooked at all at the end of cook cycle.
R-590BK R-590BW TEST PROCEDURES Procedure Letter A. Component Test Magnetron Assembly Test 1. 2. 3. 4. Disconnect the power supply cord, and then remove outercase cabinet. Open the door and block it open. Discharge the 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 1Q. 5.
R-590BK R-590BW Procedure Letter c. Component Test High Voltage Rectifier Test 1 . Disconnect the power supply cord, and then remove outer case cabinet. 2 .Open the door and block it open. 3 .Discharge the high voltage capacitor. 4 .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.
R-590BK R-590BW TEST PROCEDURES Procedure Letter E. Component Test Continued Primary Interlock Relay (RY-2) 1 Disconnect the power supply cord, and then remove outer case cabinet. 2: Open the door and block it open. 3 . Discharge the high voltage capacitor. 4 . Disconnect two (2) wire leads from the relay on the printed circuit board in the control panel assembly. The relay is located on the bottom portion of the circuit board on the backside of the control panel assembly.
R-590BK R-590BW Procedure Letter E. Component Test Continued Open Monitor Fuse Fm 1. 2. 3. 4 Disconnect the power supply cord, and then remove outer case cabinet. Open the door and block it open. Discharge the high voltage capacitor. If the monitor fuse is open, perform the tests for the primary interlock system, secondary interlock switch and the monitor switch according to the procedure outlined in this section. Adjust or replace the secondary interlock and door sensing switches. 5. 6. 7. 8.
R-590BK R-590BW TEST PROCEDURES Procedure Letter G. Component Test Continued Touch Control Panel Assembly Test 1. Switch Unit 1. Disconnect the power supply cord, and then remove outer case cabinet 2. Open the door and block it open. 3. Discharge the high voltage capacitor. 4. Check unit ribbon connection before replacement. 5. Reconnect all leads removed from components during testing. 6. Re-install the outercase (cabinet). 7. Reconnect the power supply cord after the outer case is installed. 8.
R-590BK R-590BW Component Test Procedure Letter H. Relay Test 1 . Disconnect the power supply cord, and then remove outer case cabinet. 2 . Open the door and block it open. 3 . Discharge the 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 insulated tape. 6 . After the above procedure , reconnect the power supply cord. 7 . Checkvoltage between Pin No.
R-590BK R-590BW TEST PROCEDURES Component Test Procedure Letter 1. Continued Procedures to be taken when the foil pattern of the printed wiring board (PWB) is open 5. Make a visual inspection of the varistor burn damage and test the transformer with an ohmmeter for the presence of layer short-circuit (check the primary coil resistance which is approximately 133 Q & 10%). If any abnormal condition is detected, replace the defective part(s). 6. Reconnect all leads removed from components 7.
R-590BK R-590BW Procedure Letter J. Component Test Compu Defrost Test 1. Place one cup of water in the center of the turntable tray in the oven cavity. 2. Close the door, touch the ” DEFROST” button and select” STEAKS-CHOPS 1” button and touch ” DEFROST GO ON ” button and touch the number button “5”. And then touch the “START” button. 3. The oven is in “COMPU DEFROST” cooking function. 4. The oven will operate as follows: Weight 1 / 0.
R-590BK R-590BW Component Test Procedure Letter L. AH Sensor Test Checking the initial sensor cooking condition 1. The oven should be plugged in at least five minutes before sensor cooking. 2. Room temperature should not exceed 95’ F (35” C). 3. The unit should not be installed in any areas where heat and steam are generated. The unit should not be installed, for example, next to a conventional surface unit. Refer to the “INSTALLATION INSTRUCTIONS” of the operation manual. 4.
R-590BK R-590BW TEST PROCEDURES Component Test Procedure Letter L. AH Sensor Test (Continued) If the new sensor does not operate properly, the problem is with the control unit. Checking the Control Unit 1. 2. 3. 4. 5. 6. 7. Disconnect the power supply cord, and then remove outer case cabinet. Open the door and block it open. Discharge the high voltage capacitor. Disconnect the sensor connector that is mounted to control panel. Then connect the dummy resistor circuit (see fig.
R-590BK R-590BW OUTLINE OF TOUCH CONTROL PANEL 8. The touch control section consists of the following units as shown in the touch control panel circuit: (1) Switch Unit (2) Control Unit (The Control Unit consist of Power Unit and LSI Unit) The principal functions of these units and their related signals are explained below. Switch Unit The key unit is composed of a matrix. Signals generated in the LSI are sent to the key unit through P41, P42, P43 and P44.
R-590BK R-590BW SERVICING Precautions for Handling Electronic Components 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. 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.
R-590BK R-590BW COMPONENT REPLACEMENT/ADJUSTMENT PROCEDURE Microwave ovens contain circuitry capable of producing very high voltage and current, contact with the following parts may result in severe, possibly fatal, electric shock. Example High Voltage Capacitor, Power Transformer, etc.. Magnetron, High Voltage Rectifier Assemb y, High Voltage Harness Avoid possible exposure to microwave energy. Please follow the instructions below before operating the oven. 5.
R-590BK R-590BW COMPONENT REPLACEMENT I ADJUSTMENT PROCEDURE Please refer to “OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS” When carrying out any of the following removal procedures: Outer Case Removal left portion of rear cabinet using a T20H Torx type or GTXH20-100 screw driver. 4 . Remove the two screws (2) from the rear of outer case. 5 . Slide the entire case back about 1 inch (3cm) to free it from retaining clips on the cavity face plate. 6 . Lift entire case from the unit. 1.
R-590BK R-590BW COMPONENT REPLACEMENT / ADJUSTMENT PROCEDURE Magnetron Installation with care to prevent damage to the magnetron tube. 2. Secure the magnetron with four (4) screws. 3. Hold the chassis support to the magnetron and magnetron duct with one (1) screw. 4. Connect wire leads to the magnetron . 5. Re-install outer case and check that the oven is operating properly. When replacing the magnetron, be sure that the R.F. gasket is in place and that the mounting screws are tightened securely. 1 .
R-590BK R-590BW COMPONENT REPLACEMENT / ADJUSTMENT PROCEDURE Turntable Motor Re-install 3. Secure motor cover with one (1) screw to base plate. 1 . Remove any sharp edges on the turntable motor cover and the base plate with cutting pliers. 2 . Insert the edge of motor cover into tab on the base plate. Cooling Fan Motor Removal 1 . Disconnect the power supply cord and remove outer case cabinet. 2 . Open the oven door and block it open. 3 . Discharge the high voltage capacitor.
, R-590BK R-590BW COMPONENT REPLACEMENT/ADJUSTMENT Door Sensing Switch I Secondary Interlock Switch and Monitor Switch Adjustments Then check lower portion of the latch hook, by pushing and pulling the lower portion of the door toward the oven face. Both results (play of the door) should be less than 0.5mm. 2. The door sensing and secondary interlock switches interrupt the circuit before the door can be opened. 1 . Disconnect the power supply cord and remove outer case cabinet. 2 .
R-590BK R-590BW DOOR DISASSEMBLY After adjustment, make sure of the following: Removal 1. Door latch heads smoothly catch latch hook through latch holes, and also latch head goes through the center of the hole. 2. Deviation of door alignment from horizontal line of cavity face plate is less than 1 .O mm. 3. Door is positioned with its face depressed toward cavity face plate. 4. Install the outer case cabinet and check for microwave leakage around the door with an approved microwave survey meter.
R-590BK R-590BW ABSOLUTE HUMIDITY SENSOR CIRCUIT Structure of Absolute Humidity Sensor the sensor cooking of the unit. When the unit is set in the sensor cooking mode, 16 seconds later the detector circuit starts to function and the LSI observes the initial voltage available at its AN1 terminal. With this voltage given, the switches SW1 to SW5 in the LSI are turned on in such a way as to change the resistance values in parallel with R56-60 of IC4.
AH SENSOR DUCT REMOVAL 7. Slide the two tabs of the sensor duct to the right. 1 . Disconnect the power supply cord. 2 . Open the oven door and block it open. 8. Sensor duct is now free. 3 . Remove screws from the rear of the outercase cabinet. Slide the entire case back about 1 inch (3cm) to free it from retaining clips on the cavity faceplate. 4 . Discharge Discharge the high voltage capacitor before touching any oven components or wiring. the high voltage capacitor. 5 .
R-590BK R-590BW AH SENSOR ORIENTATIOI\I & HARNESS ROUTING AH Sensor Orientation Mounting Screw AH densor Mocntiw AH Sensor Duct Screw II Figure l-1 6 Oven Left Side View c .. AH Sensor Harness b .
R-590BK R-590BW MICROWAVE MEASUREMENT PROCEDURE 2 . Place the oven tray in the oven cavity. After adjustment of the door, interlock and monitor switches are completed individually or collectively, a INTERLOCK SWITCH TEST and MICROWAVE LEAKAGE TEST must be performed to assure compliance with DHHS (CDRH) Performance Standards for Microwave Ovens. 3 . Place the load of 275 & 15ml(9.8 oz.) of tap water initially at 20 + 5°C (68’F) in the center of the oven cavity.
R-590BK R-590BW 2 1 4 3 6 5 P - B L n /C - D - E - F - 3 - H 1 2 4 3 33 5 6
R-590BK R-590BW J 1 2 3 4 34 5 C
R-590BK R-590BW 2 1 4 3 6 5 A r Dl -D4 1N4001 Tl - L!f - T \ a (c81 - T WT T B IdO AC1 20V 60Hz * 77 u d c5 a v -_,I R6 82 Iw I --T I I -- J C TURNTABLE MOTOR OVEN LAMP FAN MOTOR RYI D7 RY2 -i MICRO 1 Q2 12) I iR4*i:3kt - Fix 1+i?z- I 238 Cl 0 12 r -I t C6 I Cl0 I . c4 -- L p-, FE .. -.
R-590BK R-590BW 6 5 4 3 2 1 A 1 ,G8 B I G7 I I I G6 C D -0 s-\- *Q E E x a -\ -0 -\I z -0 * -\%- \ I ‘G2 w F F -0 -\- -0 5s -\*Q -T- G G H H Switch Unit Circuit ~ 1 I I I 2 4 3 36 I _ 5 6 -
R-590BK R-590BW 4 3 2 1 - 6 5 I koa 99 x 000 uaL9otl a37 I I (WJP 7 am) 80 L99aH q , 1 2 I 4 3 37 5 6
R-590BK R-590BW 3 2 I 4 u 3 A B C D E F G -- H ~ l- l LI- 4 I 3 L- Printed Wiring Board ---. _of Power Unit and Switch Unit I n I 38 4 ---1 5 L I 6 .
R-590BK R-590BW 1 2 3 4 5 6 1 3 B - m J C - II D Front side - E E - ! F F - G ( - H 1 t Back side Printed Wiring Board of Display Unit 2 3 4 39 5 6
R-590BK R-590BW PARTS LIST Contact your nearest SHARP Parts Distributor to order. For location of SHARP Parts Distributor, Please call Toll-Free; I-800-BE-SHARP Ref No. Part No. Q Description Qty Code AQ Electrical l- 1 RC-QZBOl8MREO M H.V. Capacitor 1 l- 2 FH-DZBOO8MRYO M H.V.
R-590BK R-590BW Ref No. Part No. 5 Description Qty Code Control Panel 3-l DPWBFBO88MRUO M Power unit 3-1A QCNCMA275DREO J 2-pin connector 1 AZ 2 &lB QCNCMA432DREO J l&pin AD (CN-C) 1 I1 RC-KZAO87DREO J Capacitor AF O.lpF 50V 1 12 VCEAB31VWlO8M J Capacitor 1OOOpF AB 35V 1 AD 13 RC-KZAO87DREO J Capacitor O.
R-590BK R-590BW Ref No. Part No.
R-590BK R-590BW 1 2 3 4 5 6 Cavity Assembly E - E - C 6-11 2 .
R-590BK R-590BW 1 2 ‘\ ‘.,’ 3 4 /’ 5 6 4-o Door Assembly ------~-------~_--__ ::: --------------__ r .\ \ I H I ----~ -- I 1H I \ . I .
R-590BK R-590BW 3 2 1 4 6 5 Wire Harnesses A rc A-, may be different than illustrations. * Actual harnesses Packing and Accessories rr ” a OPERATION MANUAL * PACKING KIT /l 0 A TURNTABLE SUPPORT TURNTABLE TRAY BAG ITIC * Non-replaceable E items.
SHARK ‘980 SHARP CORP. (7M2.70E) Printed in U.S.A.
