R-320CD/CK/CW R-330CK/CW SERVICE MANUAL S2904R320CPW/ MICROWAVE OVEN MODELS COOK SENSO R LBS KG DEF HELP REHEAT SENSOR CUSTOM SENS HELP OR C OOK Baked Potatoes Popcorn Frozen Vegetable s Ground Meat Rice Chicken Breast Frozen Entrees Fresh Vegetable s Fish/ Seafood NT A CTIO Fresh N Rolls/Muff ins Beverage Frozen Rolls/Muff COMP ins U DEF ROST Ground Meat Steaks/ Chops Chicken Pieces INSTA 1 2 6 7 Kitchen Timer Power Level 3 4 8 9 Clock Stop Clear 5 o Minute Plus Start R-320CD R-320
R-320CD/CK/CW R-330CK/CW 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.
R-320CD/CK/CW R-330CK/CW 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 Voltage When the testing is completed, 1.
R-320CD/CK/CW R-330CK/CW 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/cm2 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/cm2 at any point 5cm or more from the external surface of the oven.
R-320CD/CK/CW R-330CK/CW SERVICE MANUAL PRODUCT DESCRIPTION MICROWAVE OVEN R-320CD/ R-320CK/ R-320CW/ R-330CK/ R-330CW GENERAL INFORMATION FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVEN, R-320CD, R-320CK, R-320CW, R330CK, R-330CW. 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.
R-320CD/CK/CW R-330CK/CW SPECIFICATION ITEM Power Requirements Power Output DESCRIPTION 120 Volts / 13 Amperes 60 Hertz Single phase, 3 wire grounded 1100 watts (IEC-705 TEST PROCEDURE) Operating frequency of 2450MHz Case Dimensions Width 20-1/2" Height 11-7/8" Depth 16-7/8" Cooking Cavity Dimensions Width 14-3/4" Height 8-3/4" Depth 15-3/4" Touch Control System Clock ( 1:00 - 12:59 ) Timer (0 - 99 min. 99 seconds) Microwave Power for Variable Cooking Repetition Rate; P-HI .........
R-320CD/CK/CW R-330CK/CW 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 personal 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.
R-320CD/CK/CW R-330CK/CW OPERATION DESCRIPTION OF OPERATING SEQUENCE 7. The monitor switch electrically monitors the operation of the secondary interlock switch and primary interlock relay 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 primary interlock relay (RY2) and secondary interlock switch open their contacts. And contacts of the relay (RY1) remains closed. Then the monitor switch contacts close.
R-320CD/CK/CW R-330CK/CW SENSOR COOKING CONDITION NOTE: During this first stage, do not open the door or touch STOP/CLEAR pad. 4. When the sensor detects the vapor emitted from the food, the display switches over to the remaining cooking time and the timer counts down to zero. At this time, the door may be opened to stir, turn, or season food. 5. When the timer reaches zero, an audible signal sounds. The shut-off relay and cook relay are de-energized and the power transformer, oven lamp, etc.
R-320CD/CK/CW R-330CK/CW SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. CLOCK APPEARS ON DISPLAY. MONITOR FUSE 20A NOTE: " THERMAL CUT-OUT (OVEN) " indicates components with potential above 250V. THERMAL CUT-OUT (MG.) COM. POWER TRANSFORMER N.O. F3 A2 CAPACITOR 1.0µF AC 2300V F2 F1 PRIMARY INTERLOCK RELAY AH SENSOR (RY-2) (RY-1) A1 CONTROL UNIT N.O. COM.
R-320CD/CK/CW R-330CK/CW DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM of the monitor switch contacts. CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE TEST THE DOOR SENSING SWITCH, PRIMARY INTERLOCK RELAY (RY2), RELAY (RY1), SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER OPERATION. (REFER TO CHAPTER "TEST PROCEDURE"). NOTE: MONITOR FUSE AND MONITOR SWITCH ARE REPLACED AS AN ASSEMBLY. The door is opened by pushing the open button on the control panel, refer to the Figure D-1.
R-320CD/CK/CW R-330CK/CW 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.
R-320CD/CK/CW R-330CK/CW CK = Check / RE = Replace Home fuse or circuit breaker blows when power cord is plugged into wall receptacle Monitor fuse blows when power cord is plugged into wall receptacle. OFF CONDITION All letters and indicators do not appear in display when power cord is first plugged into wall outlet. Display does not operate properly when STOP/CLEAR key is touched. (Buzzer should sound and ":" or time of day should appear in display.) Oven lamp does not light when door is opened.
R-320CD/CK/CW R-330CK/CW TEST PROCEDURES PROCEDURE LETTER A COMPONENT TEST MAGNETRON ASSEMBLY TEST 1. 2. 3. 4. 5. 6. 7. 8. 9. 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.
R-320CD/CK/CW R-330CK/CW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST (HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO MEASURE THE FILAMENT AND HIGH VOLTAGE.) C HIGH VOLTAGE RECTIFIER TEST 1. 2. 3. 4. 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.
R-320CD/CK/CW R-330CK/CW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 5. Reconnect all leads removed from components during testing. 6. Reinstall the outer case (cabinet). 7. Reconnect the power supply cord after the outer case is installed. 8. Run the oven and check all functions. CAUTION: IF THE THERMAL CUT-OUT INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE, REPLACE THERMAL CUT-OUT. F SECONDARY INTERLOCK SWITCH TEST 1. 2. 3. 4. 5. 6. 7. 8.
R-320CD/CK/CW R-330CK/CW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 5. 6. 7. 8. with the door opened (in this condition the plunger of the monitor switch is pushed in), the meter should indicate an 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. Screw Driver Reconnect all leads removed from RED WHT components during testing.
R-320CD/CK/CW R-330CK/CW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 6) Re-install the outer case (cabinet). 7) Reconnect the power supply cord after the outer case is installed. 8) Run the oven and check all functions. The following symptoms indicate a defective key unit. a) When touching the pads, a certain pad produces no signal at all. b) When touching a number pad, two figures or more are displayed. c) When touching the pads, sometimes a pad produces no signal. If the Key unit is defective.
R-320CD/CK/CW R-330CK/CW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST control unit does not respond, it is faulty and must be replaced. If a specific pad does not respond, the above method may be used (after clearing the control unit) to determine if the control unit or key pad is at fault. 5. Reconnect all leads removed from components during testing. 6. Re-install the outer case (cabinet). 7. Reconnect the power supply cord after the outer case is installed. 8. Run the oven and check all functions.
R-320CD/CK/CW R-330CK/CW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST (3) The oven is in Compu Defrost cooking condition. (4) The oven will operate as follows WEIGHT 0.5lb 1ST STAGE LEVEL TIME 60% 42sec. 2ND STAGE LEVEL TIME 40% 32sec. (5) If improper operation is indicated, the control unit is probably defective and should be checked.
R-320CD/CK/CW R-330CK/CW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 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 functions. N AH SENSOR TEST Checking the initial sensor cooking condition WARNING : The oven should be fully assembled before following procedure.
R-320CD/CK/CW R-330CK/CW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 9-1. Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup. 9-2. Place the container on the center of tray in the oven cavity. 9-3. Close the door. 9-4. For R-320CD/CK/CW, touch REHEAT SENSOR pad once. For R-330CK/CW, touch Sensor Reheat pad and touch the Start pad. 9-5. The control panel is in automatic Sensor operation. 9-6.
R-320CD/CK/CW R-330CK/CW TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL 7) Door Sensing Switch A switch to “tell” the LSI if the door is open or closed. The touch control section consists of the following units. (1) Key Unit (2) Control Unit (The Control Unit consists of Power Unit and LSI Unit). 8) Back Light Circuit For R-320CD/CK/CW A circuit to drive the back light (Light emitting diodes LD1LD4). For R-330CK/CW A circuit to drive the back light (Light emitting diodes LD10LD19).
R-320CD/CK/CW R-330CK/CW LSI(IZA949DR) : R-320CD/CK/CW The I/O signal of the LSI(IZA949DR) is detailed in the following table. Pin No. Signal I/O Description 1 AN10 IN Signal coming from touch key. When either G10 line on key matrix is touched, a corresponding signal out of P10 - P17 will be input into AN10. When no key is touched, the signal is held at "H" level. 2 AN11 IN Signal similar to AN10. When either G9 line on key matrix is touched, a corresponding signal will be input into AN11.
R-320CD/CK/CW R-330CK/CW Pin No. Signal I/O 23 P24 OUT Description Oven lamp, fan motor and turntable motor driving signal 16.7 msec. To turn on and off shut off relay (RY1). The square waveform voltage is delivered to the RY1 driving circuit and RY2 control circuit. H : GND L : -5V During cooking 24 P25 OUT Magnetron high-voltage circuit driving signal. OFF H : GND To turn on and off the cook relay (RY2).
R-320CD/CK/CW R-330CK/CW Pin No. Signal I/O 55 SEG10 OUT Terminal not used. Description 56-82 SEG11-SEG37 OUT Segment data signal. Signal similar to SEG1. 83-85 SEG38-SEG40 OUT Terminal not used. 86 P40 OUT Terminal not used. 87 P41 IN Signal similar to AN10. When either G13 line on key matrix is touched, a corresponding signal will be input into P41. 88 P42 IN Signal similar to AN10. When either G12 line on key matrix is touched, a corresponding signal will be input into P42.
R-320CD/CK/CW R-330CK/CW Pin No. Signal I/O Description P42 terminal while one of G6 line keys on key matrix is touched. Key strobe signal. Signal applied to touch-key section. A pulse signal is input to AN9, AN10, AN11, P41 and P42 terminal while one of G5 line keys on key matrix is touched. 7 P13 OUT 8 P14 OUT Key strobe signal. Signal applied to touch-key section. A pulse signal is input to AN9, AN10, AN11, P41 and P42 terminal while one of G4 line keys on key matrix is touched.
R-320CD/CK/CW R-330CK/CW Pin No. Signal I/O 27-29 P30-P32 OUT Terminal not used. 30-34 P33-P37 OUT Used for initial balancing of the bridge circuit (absolute humidity sensor). 35 CVCC IN Connected to GND. 36 VSS IN Power source voltage: -5.0V. The power source voltage to the LSI is input to VSS terminal. Connected to VC. 37-38 V3-V2 IN Terminal not used. 39-40 V1-V0 IN Power source voltage input terminal. Standard voltage for LCD. Connected to GND.
R-320CD/CK/CW R-330CK/CW ABSOLUTE HUMIDITY SENSOR CIRCUIT which the resistance balance of the bridge circuit is deviated to increase the voltage available at AN1 terminal of the LSI. Then the LSI observes that voltage at AN1 terminal and compares it with its initial value, and when the comparison rate reaches the preset value (fixed for each menu to be cooked), the LSI causes the unit to stop sensor cooking; thereafter, the unit goes in the next operation automatically.
R-320CD/CK/CW R-330CK/CW TOUCH CONTROL PANEL SERVICING 3) Re-connect the leads to the primary of the power transformer. 4) Re-install the outer case (cabinet). 5) Re-connect the power supply cord after the outer case is installed. 6) Run the oven and check all functions. 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.
R-320CD/CK/CW R-330CK/CW 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.. WARNING: Avoid possible exposure to microwave energy.
R-320CD/CK/CW R-330CK/CW CAUTION: 1. DISCONNECT OVEN FROM POWER SUP PLY BEFORE REMOVING OUTER CASE. 2. DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING. NOTE: When replacing the outer case, the 2 special Torx screws must be reinstalled in the same locations. Special screw Screw Driver (Type: TORX T20 H or GTXH20-100) POWER TRANSFORMER REMOVAL 1. Disconnect the power supply cord and then remove outer case. 2. Open the oven door and block it open. 3.
R-320CD/CK/CW R-330CK/CW MAGNETRON REMOVAL Removal 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 wire leads from magnetron. 5. Remove the four (4) screws holding chassis support to magnetron, oven cavity back plate, oven cavity front flange and fan duct. 6. Remove the chassis support from oven. 7. Carefully remove the four (4) screws holding magnetron to waveguide flange. 8.
R-320CD/CK/CW R-330CK/CW 3. Stick the key unit firmly to the control panel frame by rubbing with soft cloth not to scratch. CPU UNIT NOTE: Handle the CPU unit carefully so that the ribbon cable does not come off. Because the ribbon cable is glued on the LCD and the printed wiring board only by heated paste. Printed wiring board of CPU unit Liquid Crystal Display (LCD) Ribbon cable CPU unit COOLING FAN MOTOR REMOVAL 15.Remove the two (2) screws holding the fan motor to the fan duct. 16.
R-320CD/CK/CW R-330CK/CW TURNTABLE MOTOR REMOVAL 5. Disconnect wire leads from turntable motor. (See "Positive lock connector removal") 6. Remove two (2) screws holding turntable motor to oven cavity. 7. Now the turntable motor is free. 8. After replacement use the one (1) screw to fit the turntable motor cover. 1. Disconnect the power supply cord. 2. Remove turntable and turntable support from oven cavity. 3. Lay the oven on it's backside.
R-320CD/CK/CW R-330CK/CW 4. Pry the choke cover by inserting a putty knife as shown Figure C-4. 5. Release choke cover from door panel. 6. Now choke cover is free. 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 with door frame is free from oven cavity. approved microwave survey meter. (Refer to Microwave Measurement Procedure.
H 1 2 3 35 RY2 COM. 1 2 N.O. CN-A N.O. COM. SH-B T1 RY1 PRIMARY INTERLOCK RELAY SH-A (POWER UNIT) CN-C GRN GRY YLW YLW CN-A 1 WHT 2 CN-F 4 5 COM.
R-320CD/CK/CW R-330CK/CW 2 1 4 3 6 5 A A CN-C 12PIN LEAD WIRE HARNESS B Q2 2SB1238 b + – LED C2 GND + – C4 10µ/35v a 1SS270A C3 0.1µ/50v d C 1SS270A C10 B R5 4.7k ZD1 HZ16-1 A2 D6 C1 0.1µ/50v AC 10G471K A1 VRS1 CN-A D5 C2 1000µ/35v D1-D4 11ES1 T1 R1 2.4k R4 27 C C3 VC C1 VA C4 INT C9 VR C5 BUZZER C6 OVEN LAMP TURNTABLE MOTOR FAN MOTOR R3 510 1/2w (J1) Q1 2SB1238 R2 680 1/2w c D D SP1 PKM22EPT Q3 KRC243M R6 3.
37 C-11 C-8 (BROWNER) NC C-12 C-7 DOOR MICRO C-6 C-5 BUZZER OVEN LAMP TURNTABLE MOTOR FAN MOTOR C-1 C-9 C-10 VA VR LED C-3 NOTE D41 1SS355 D20 1SS355 4 C12 0.1µ /50v C11 0.1µ/50v AH SENSOR F-2 C20 0.1µ/50v F-1 Q21 DTA123JKA Q20 DTA143EKA Q30 DTA143EKA R90 330 1w IC2 BA4558 6 4 IC2 5 + 8 R10 1k ZD10 UDZ4.3B D90 MA152WA R92 1.8kF C90 0.
3 38 C-11 C-8 (BROWNER) NC C-12 C-7 DOOR MICRO C-6 C-5 BUZZER OVEN LAMP TURNTABLE MOTOR FAN MOTOR C-1 C-9 C-10 C-3 VA VR LED VC NOTE D41 1SS355 D20 1SS355 LD19 LD18 LD17 LD10 LD11 LD12 – + C12 0.1µ /50v C11 0.1µ/50v 4 AH SENSOR F-2 C20 0.
3 39 4 IC1 P74 NOTE R127 4.7k R134 15k R126 4.7k R125 4.7k R124 4.7k R123 4.7k : IF NOT SPECIFIED, 1/10W ± 5% 75 76 LIQUID CRYSTAL DISPLAY 4 5 5 Figure S-5. Indicator Circuit For R-330CK/CW C123 0.1µ/50v C122 0.1µ/50v C121 0.
R-320CD/CK/CW R-330CK/CW 2 1 4 3 6 5 A A B (CN - C) 1 12 2 1 2 C5 4 E 5 6 ZD1 R1 B Q3 SP1 1 D7 VRB C 2 7 8 9 U SH - A R2 D5 D6 SH - B B Q2 E Q1 B R5 R4 3 R3 D8 R6 D CN - C 1 WH - 1 C4 C B 1 9 E C3 CN - B D D C2 RY2 P T1 AC 1 VH VRS1 D1 D3 E 2 CN - A XA D9 AC RY1 G F (CN - D) OMIF D U QKITPB026MRE0 F D4 D2 S E F 11 C1 10 (D10) OL FM TTM RY3 G H H Figure S-6.
R-320CD/CK/CW R-330CK/CW PARTS LIST Note: The parts marked “ ∆” may cause undue microwave exposure. The parts marked “*” are used in voltage more than 250V. REF. NO. PART NO.
R-320CD/CK/CW R-330CK/CW REF. NO. 3- 3-1 3- 3-1 3- 3-1 3- 3-1 3- 3-1 3- 4 3- 4 3- 4 3- 4 3- 4 3- 5 3- 6 3- 6 3- 6 3- 6 3- 6 3- 7 3- 7 3- 7 3- 7 3- 7 3- 8 PART NO.
R-320CD/CK/CW R-330CK/CW REF. NO. 6- 8 6- 8 6- 8 6- 8 6- 8 6- 9 6-10 6-10 PART NO.
R-320CD/CK/CW R-330CK/CW 2 1 4 3 6 5 OVEN AND CABINET PARTS 7-5 4-18 2-1 4-13 7-8 A A 4-17 7-5 1-15 4-10 6-7 7-1 B B 7-2 7-8 1-10 1-11 4-19 6-6 1-4 1-8 7-7 7-5 C C 7-6 7-3 6-9 1-5 D D 7-4 4-7 4-20 7-1 4-12 4-3 4-15 1-7 1-13 1-1 7-5 E E 4-14 1-2 6-2 4-4 4-2 4-11 4-8 7-6 1-3 1-12 7-3 4-5 1-1 F 7-6 7-2 1-6 7-1 6-1 4-9 7-5 7-6 F 7-1 4-1 1-14 2-2 4-6 4-16 2-4 1-9 G G 7-6 2-3 7-6 H H 7-6 7-6 7-6 2-3 1 2 4 3 44 5 6
R-320CD/CK/CW R-330CK/CW 2 1 4 3 6 5 3-8 CONTROL PANEL PARTS 3-2 3-8 A A 3-2 3-7 3-6 3-7 3-3 3-6 3-8 B B 3-8 3-1 3-3-1 3-1 3-3 C 3-3-1 3-4 C 3-4 3-5 R-330CK/CW R-320CD/CK/CW 3-5 D D 5-9 5-7 DOOR PARTS 5-2 5-7 5-1 E E 5-8 5-7 5-3 F 5-7 5-4 5-8 F 5-8 5-8 5-5 G G 5-6 MISCELLANEOUS 6-3 (CAPACITOR) 6-4 H H 6-5 Actual wire harness may be different from illustration.
R-320CD/CK/CW R-330CK/CW COPYRIGHT © 1999 BY SHARP CORPORATION ALL RIGHTS RESERVED. No part of this publication may be reproduced, stored in retrieval systems, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher. '99 SHARP CORP. (2S2.530E) Printed in U.S.
