R-408CW R-409CK SHARP@ SERVICE MANUAL S39M125R408CE MICROWAVE OVEN MODELS R-408CW/R=409CK 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. 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.
(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.
SERVICE MANUAL SHARR Microwave Ovens Specifications R=408CW/R=409CK Foreword This manual has been prepared to provide Sharp Electronics Corporation personnel with complete operation and service information for Sharp microwave oven models R-408CW/R-409CK. 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.
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. Don’t Touch ! Danger High Vol tage Before Servicing 1.
R-408CW R-409CK SPECIFICATIONS Item Description Power Requirements 120 Volts 13.3 Amperes 1550Watts 60 Hertz Single phase, 3 wire grounded Power Output 1100 watts (IEC-705 Test Procedure) Operating frequency of 2450 MHz Case Dimensions Width 2111/,$ Height 123/<’ (including feet) Depth 173/i’ Cooking Cavity 1.4 Cu.Ft. Width 15” Height 97/,;’ Depth 1631:’ Tray Size 141/< Diameter Control Complement Touch Control System Clock (I:00 - 12:59) Timer (0 - 99 min. 99 sec.
Grounding Instructions Grounded Receptacle Box Grounded Receptacle Box 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. Receptacle 3 Pronged Plug WARNING: Improper use of the grounding plug can result in a risk of electric shock.
Key Unit Layout MINUTE PLUS ACTION INSTANT PAD AGAIN TO ADJUST QUANTITY -TOUCH 1 Ground Meat 2 Steaks/Chops 3 Chicken Pieces 1 4 1 5 7 1 Power Level / I 3 Chicken Pieces COMPU DEFROST * I 3 1 6 9 8 0 1 f11213’ I I I It 4 I 5 I I I I I 6 Timer Clock I R-408CW I I stop Clear ( START R-409CK j
R-408CW R-409CK OPERATION Description of Operating Sequence The following is a description during oven operation: of component interlock relay and is mechanically associated the door so that it functions as follows: functions Off Condition (a.) Closing the door activates the door sensing switch and secondary interlock switch. In this condition, the monitor switch contacts are opened. When the oven is plugged in, 120 volts AC is supplied to the control unit (see schematic diagram).
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.
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. (Refer to “Test Procedure” section.
Troubleshooting Guide Problem mamp does not light at all. Oven lamp lights, but fan motor and turntable motor do not operate. Oven does not go into cook cycle when START button is touched. Oven seems to be operating but little or no heat is produced in oven load. (incompletely cooked or not cooked at all at the end of cook cycle.) Oven goes into a cook cycle but extremely uneven heating is produced in oven load (food). -does not cook properly when programmed for Cooking Power P-50 (MED.) mode.
TEST PROCEDURES Procedure Letter A. Component Test Magnetron Assembly Test 1. Disconnect the power supply cord, and then remove outercase cabinet. 2. Open the door and block it open. 3. Discharge the high voltage capacitor. 4. 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 IQ. 5.
TEST PROCEDURES Procedure Letter C. Component Test High Voltage Rectifier Test 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. 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.
TEST PROCEDURES Component Test Procedure Letter E. 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.
IEE? TEST PROCEDURES Procedure Letter E. Component Test Continued Open Monitor Fuse I. 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 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. F.
Procedure Letter G. Component Test Continued Touch Control Panel Assembly Test 1. Key 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. Run the oven and check all functions.
TEST PROCEDURES 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. Check voltage between Pin No.
TEST PROCEDURES Component Test Procedure Letter I. 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 a layer short-circuit (check the primary coil resistance which is approximately 540 I(z & 20%). If any abnormal condition is detected, replace the defective part(s) = 6. Reconnect all leads removed from components during testing. 7.
Component Test Procedure Letter J Compu Defrost Test WARNING : The Oven should be fully assembled 1. 2. 3. 4. 5. Place one Close the Touch the The oven The oven before following procedure. cup of water in the center of the turntable tray in the oven cavity. door, touch the “COMPU DEFROST” pad twice. number pad “5” and Then touch the “START” pad. is in “COMPU DEFROST” cooking mode. will operate as follows: Weight Time Level Time 60% 27sec. 40% 17 sec. operation is indicated, Level 0.5 lb 6.
OUTLINE OF TOUCH CONTROL PANEL 3. The touch control section consists of the following units as shown in the touch control panel circuit: (1) Key Unit (2) Control Unit (The Control Unit consists of Power Unit and LSI unit). 4. The principal functions of these units and their related signals are explained below. 5. Relay Circuit A circuit to drive the magnetron, motor and oven lamp. The key unit is composed of a matrix.
DESCRIPTION OF LSI LSI The I/O signals of the LSI (IZA495DR) is detailed in the following table. Pin No. Signal I/O Description 1-2 VL2-VLI IN Power source voltage input terminal. Standard voltage for LCD. 3-6 AN7-AN4 IN Terminal to change functions according to the Model. By using the AID converter contained in the LSI, DC voltage in accordance with the Model in operation is applied to set up its cooking constant. 7 P63 OUT 8 AN2 IN Input terminal to judge the Model.
I/O 1Description 1 1Pin No. 1 Signal 1 22 1 P44 / IN 1Signal similar to P45. When either G-l 1 line on key matrix is touched, a corresponding signal will be inputted into P44. / 23 ( 1 IN / Signal similar to P45. When either G-l 0 line on key matrix is touched, a corresponding signal will be inputted into P43. 24 P43 INTO IN Signal synchronized with commercial power source frequency. This is the basic timing for time processing of LSI. H: +5V L: GND 16.7 msec.
Pin No. Signal I/O 51-72 SEG21-SEGO OUT Description Segment data signal. Connected to LCD. The relation between signals are as follows: LSI signal (Pin No.) LCD (Pin No.) SEG 21 (51) . . . . . . . . . . . . . . . . . Sl SEG SEG SEG SEG SEG SEG SEG 20 19 18 17 16 15 14 (52) (53) (54) (55) (56) (57) (58) ................. ................. ................. ................. ................. ................. . .... . .. .. ... .. .. SEG 13(59) . . . . . . . . . . ..I....
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 surrounding high voltage power sources, 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, practice the following guidelines: 2.
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, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc.. oid possible exposure to microwave energy. instructions below before operating the oven. Please follow the 5. There are defective parts in the door interlock system. 6.
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. 2.
COMPONENT REPLACEMENT / ADJUSTMENT PROCEDURE Magnetron Installation 1. Install magnetron assembly to the waveguide flange 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 oper- ating properly. When replacing the magnetron, be sure that the R.F.
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. 4.
COMPONENT REPLACEMENT/ADJUSTMENT Door Sensing Switch /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. Open the oven door and block it open. 3.
_ E%%E! DOOR DISASSEMBLY Removal After adjustment, make sure of the following: 1. Disconnect the power supply cord. 2. Push the open button and 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 the figure below to free engaging parts . 4. Pry the lever and lift up the choke cover by inserting a putty knife in the order as shown in the figure below. 5. Release choke cover from door panel. 6.
Fb408CW R-409CK 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. . Place the load of 275 I!Z15ml(9.8 Interlock Switch Test Make sure that the door sensing switch, secondary interlock switch and monitor switch are operating properly by checking with an ohmmeter.
RED I+= WHT CAVITY TEMP. FUSE MAGNETRON TEMP. FUSE A2 t) T &&I t---I I 1517 m::;: N.O. SECONDARY INTERLOCK SWITCH I fi- WHT RY-1 MONITOR FUSE 3. Power supply cord terminal marked “N” must be connected to the neutral (Gray & white) wire. I I D I l-l 6. Terminal with blue mark on lamp socket must be connected to the (orange) wire. I 5. The hot (red) wire must be connected to the (finish lead) terminal of the power transformer. 4.
1 r 3 L I 3 4 b I A B C C D E F A G H 1 2 I 4 3 31 5
2 1 4 3 5 6 4 CN-C 9PIN LEAD WIRE HARNESS CN-A GND AC VR INT OVEN LAMP TURNTABLE MOTOR FAN MOTOR BUZZER I OVEN LAMP TURNTABLE MOTOR FAN MOTOR r AC MICRO MICRO E (BROWNER) NC DOOR SENSING SWITCH I SH-6 \ I F DOOR \[Clj Power Unit Circuit 1 I 2 I 3 I 32 4 I 5 I 6
1 2 4 3 5 6 4 A - - B I3 - - c C -E - - D D - - E 4zmo’o 63 E A9l/rlLtr 23 +-I N - i - 1 I F - G F - c I - J I - 5 - 4 H 0 1 2 4 3 33 I- 5 6
1 4 3 2 5 6 5 6 \ - 5 - DIP : - SPl 1 - E VH - F BROWNER RY3 RY2 MICRO - 3 - f- Printed Wiring Board of Power Unit 1 2 4 3 34
PARTS LIST Contact your nearest SHARP Parts Distributor to order. For location of SHARP Parts Distributor, Please call Toll-Free; 1-800-BE-SHARP Ref No. Part No. Q l- 1 RC-QZBO18MREO M l- 2 FH-DZB008MRYO M Qty Code H.V. Capacitor 1 AQ H.V.
Ref No. Part No.
R-408CW R-409CK I I 1 I A w I 1 2 4 3 37 5 - 6
1 2 3 4 5 6 Control Panel Assembly 4 A 3 B Door Assembly E E F F 1 I 2 I 3 I 38 4 I 5 I 6
5 4 3 2 1 6 Wire Harnesses * Actual harnesses may be different than illustrations. : Packing and Accessories TURNTABLE SUPPORT G * PACKING CASE H H * Non-replaceable items.
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SHARF? ‘990 SHARP CORP. (3M3.2E) Printed in U.S.A.
