R-320FK R-320FQ R-320FW SERVICE MANUAL S3205R320FPW/ MICROWAVE OVEN MODELS R-320FK R-320FQ R-320FW 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 contain circuitry capable of producing very high voltage and current, contact with following parts may result in a severe, possibly fatal, electrical shock.
R- 320 FK R- 320 FQ R-320FW 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-320FK R-320FQ R-320FW 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- 320 FK R- 320 FQ R-320FW 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-320FK R-320FQ R-320FW SERVICE MANUAL PRODUCT DESCRIPTION MICROWAVE OVEN R-320FK/ R-320FQ/ R-320FW 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-320FK, R-320FQ and R-320FW. 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- 320 FK R- 320 FQ R-320FW SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 14.2 Amperes 60 Hertz Single phase, 3 wire grounded Power Output 1200 watts (IEC TEST PROCEDURE) Operating frequency of 2450MHz Case Dimensions Width 20-1/2" Height 11-7/8" Depth 17-1/8" Cooking Cavity Dimensions Width 14-3/4" Height 8-3/4" Depth 15-3/4" 1.2 Cubic Feet Control Complement Touch Control System Clock ( 1:00 - 12:59 ) Timer (0 - 99 min.
R-320FK R-320FQ R-320FW 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.
R- 320 FK R- 320 FQ R-320FW OPERATION DESCRIPTION OF OPERATING SEQUENCE 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-320FK R-320FQ R-320FW tary cooking is determined by experiment with each food category and inputted into the LSI. An example of how sensor works: (POTATOES) 1. Potates at room temperature. Vapor is emitted very MIC slowly. R OW AVE 2. Heat Potates. Moisture and humidity is emitted rapidly. You can smell the aroma as it cooks. AH SENSOR MIC RO WA VE 3. Sensor detects moisture and humidity and calculates cooking time and variable power. Cooking Sequence. 1.
R- 320 FK R- 320 FQ R-320FW SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. CLOCK APPEARS ON DISPLAY MONITOR FUSE 20A THERMAL CUT-OUT (OVEN) NOTE: " " indicates components with potential above 250V. THERMAL CUT-OUT (MG.) N.O. POWER TRANSFORMER N.O. F3 A2 CAPACITOR 1µF AC 2300V F2 F1 PRIMARY INTERLOCK RELAY AH SENSOR (RY-2) (RY-1) A1 CONTROL UNIT COM. COM.
R-320FK R-320FQ R-320FW DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM 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 pulling the door. Refer to the Figure D-1.
R- 320 FK R- 320 FQ R-320FW 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-320FK R-320FQ R-320FW 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- 320 FK R- 320 FQ R-320FW 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-320FK R-320FQ R-320FW 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- 320 FK R- 320 FQ R-320FW 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-320FK R-320FQ R-320FW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 5. 6. 7. 8. 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 open circuit. If improper operation is indicated, the switch may be defective.
R- 320 FK R- 320 FQ R-320FW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 2) Re-install the outer case (cabinet). 3) Reconnect the power supply cord after the outer case is installed. 4) 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-320FK R-320FQ R-320FW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 5. 6. 7. 8. clearing with a beep the key unit is faulty and must be replaced. If the 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. Reconnect all leads removed from components during testing. Re-install the outer case (cabinet).
R- 320 FK R- 320 FQ R-320FW TEST PROCEDURES PROCEDURE LETTER L COMPONENT TEST DEFROST CENTER TEST WARNING : The oven should be fully assembled before following procedure. (1) Place one cup of water in the center of the turntable tray in the oven cavity. (2) Close the door, touch the " STEAKS / CHOPS " pad once. (3) The oven is in Compu Defrost cooking condition. (4) The oven will operate as follows MENU 1ST STAGE STEAKS/CHOPS LEVEL TIME 0.5lb 70% 15sec. 2ND STAGE LEVEL TIME 60% 25sec.
R-320FK R-320FQ R-320FW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 8) 9) 10) 11) 12) 13) 14) N Disconnect the power supply cord, and then remove outer case. Open the door and block it open. Discharge high voltage capacitor. Reconnect all leads removed from components during testing. Re-install the outer case (cabinet). Reconnect the power supply cord after the outer case is installed. Run the oven and check all functions.
R- 320 FK R- 320 FQ R-320FW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST (8) Reconnect the power supply cord after the outer case is installed. (9) Reconnect the oven to the power supply and check the sensor cook operation as follows: 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.
R-320FK R-320FQ R-320FW TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL 3) Power Source Circuit This circuit generates voltages necessary in the control unit from the AC line voltage. In addition, the synchronizing signal is available in order to compose a basic standard time in the clock circuit. 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).
R- 320 FK R- 320 FQ R-320FW DESCRIPTION OF LSI LSI The I/O signal of the LSI is detailed in the following table. Pin No. Signal I/O Description 1-2 P26-P27 OUT Terminal not used. 3-5 P70-P72 OUT Terminal not used. 6 IC IN Connected to VC. 7 X2 OUT 8 X1 IN Internal clock oscillation frequency control input setting. The internal clock frequency is set by inserting the ceramic filter oscillation circuit with respect to X1. 9 VDD1 IN Power source voltage: GND(0V).
R-320FK R-320FQ R-320FW Pin No. Signal I/O Description 23 P114 OUT Key strobe signal. Signal applied to touch-key section. A pulse signal is input to ANI7, P100, P101, P102 and P103 terminal while one of G4 line keys on key matrix is touched. 24 P115 OUT Key strobe signal. Signal applied to touch-key section. A pulse signal is input to ANI7, P100, P101, P102 and P103 terminal while one of G3 line keys on key matrix is touched. 25 P116 OUT Key strobe signal.
R- 320 FK R- 320 FQ R-320FW Pin No. Signal I/O 49 P36 OUT Description 0.1 sec. H : GND Signal to sound buzzer (2.0 kHz). A: key touch sound. B: Completion sound. A 2.0 sec. L : -5V H : GND B L : -5V 50 P37 IN To input signal which communicates the door open/close information to LSI. Door close “H” level signal (0V). Door open “L” level signal (-5V). 51 COM0 OUT Common data signal. Connected to LCD signal COM2. 52 COM1 OUT Common data signal. Connected to LCD signal COM1.
R-320FK R-320FQ R-320FW ABSOLUTE HUMIDITY SENSOR CIRCUIT (1) Structure of Absolute Humidity Sensor The absolute humidity sensor includes two thermistors as shown in the illustration. One thermistor is housed in the closed vessel filled with dry air while another in the open vessel. Each sensor is provided with the protective cover made of metal mesh to be protected from the external airflow.
R- 320 FK R- 320 FQ R-320FW TOUCH CONTROL PANEL SERVICING 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 long enough that they may be separated from each other.
R-320FK R-320FQ R-320FW 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- 320 FK R- 320 FQ R-320FW 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. POWER TRANSFORMER REMOVAL Reinstallation 1. Rest transformer on the bottom plate with its primary terminals toward the oven face plate. 2. Secure transformer with four screws to bottom plate. 3.
R-320FK R-320FQ R-320FW 9. Now, the magnetron is free. Reinstallation 1. Re-install the magnetron to waveguide flange with the four (4) screws. 2. Insert the two (2) tabs of the chassis support to the oven cavity front plate and the back plate. 3. Hold the chassis support to the oven cavity back plate, oven cavity front flange, magnetron and the fan duct with the five (5) screws. 4. Reconnect the wire leads to the magnetron and thermal cut-out (MG). Refer to "PICTORIAL DIAGRAM" on page 33. 5.
R- 320 FK R- 320 FQ R-320FW 3. Discharge high voltage capacitor. 4. Disconnect the wire leads from the fan motor and the oven lamp. 5. Remove the magnetron and chassis support from the waveguide flange, referring to "MAGNETRON REMOVAL". 6. Release the snap of the main wire harness from the fan duct. 7. Remove one (1) screw holding the fan duct assembly to oven cavity. 8. Release the main wire harness from the hole of the fan duct. 9. Release the fan duct from the waveguide flange. 10.
R-320FK R-320FQ R-320FW DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT 1. Disconnect the power supply cord, and then 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 latch hook to the oven cavity front flange. 5.
R- 320 FK R- 320 FQ R-320FW chapter “Test Procedures”.). (B) An approved microwave survey meter should be used to assure compliance with proper microwave radiation emission limitation standards. 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.
1 2 3 33 BLK 1 4 (POWER UNIT) 2 N.O. T1 RY2 PRIMARY INTERLOCK RELAY YLW BLK RED RED CN-A 1 WHT 2 GRN RED N.C. MONITOR FUSE & HOLDER 5 COM. TURNTABLE MOTOR WHT BLK RED GRY GRY BLK POWER TRANSFORMER MAGNETRON HIGH VOLTAGE CAPACITOR HIGH VOLTAGE COMPONENTS BLK THERMAL CUT-OUT (MG) NOTE: The neutral (WHT) wire must be connected to the terminal with "N" mark on the power supply cord. POWER SUPPLY CORD 120V 60Hz 5 Figure S-1.
R- 320 FK R- 320 FQ R-320FW 2 1 4 3 6 5 A A B B C10 NC C2 GND C3 NC C9 VR C4 INT C1 VA C5 BUZZER GND 3 D20 S1NB10 A1 CN-A d 1 T1 (J1) a + 4 – C2 1000µ/35v A2 C 10G471K AC VRS1 C 6 b D D OVEN LAMP FAN MOTOR TURNTABLE MOTOR SP1 c RY1 COM J2 E AC NO C6 OVEN LAMP FAN MOTOR TURNTABLE MOTOR E D1 (CN-D) C8 NC C7 MICRO D3 RY2 F MICRO NO COM B2 SH-A SH-B C11 NC C12 DOOR SENSING SWITCH F B1 CN-C (CN-B) G G 12PIN LEAD WIRE HARNESS DOOR SENSIN
35 C-12 DOOR SENSING SWITCH C1 0.1µ/50v D10 MA152WA 4 NOTE Q2 KTA1661 D30 MA152WA – + Q3 KRC243S R90 330 1w C11 0.1µ/50v C3 0.1µ/50v F-1 F-2 C20 0.1µ /50v C12 0.1µ /50v D90 MA152WA F-3 R92 1.8kF CN-F AH SENSOR (Q22 DTA123JKA) Q21 DTA123JKA Q20 DTA143EKA Q30 DTA143EKA R3 510 1/2w C4 10µ/35v : IF NOT SPECIFIED 1/10W ± 5% (D20) MA152WK R4 27 1/4w D5 D6 1SS355 x 2 R2 680 Q1 KTA1661 – C10 47µ/16v R5 4.7k C13 0.
R- 320 FK R- 320 FQ R-320FW 2 1 4 3 6 5 A A DIP 12 1 R3 C3 R5 R2 B R1 ZD1 1 2 (CN - B) D5 R4 D6 E E B Q2 C4 R6 B C1 D1 D RY1 RY3 (CN - D) D8 RY2 D7 D E (D20) C2 (D10) D9 E Q3 C5 (R9) C D4 D3 B (J2) D2 C SP1 2 1 SW B (RED) (GREEN) SH - B SH - A CN - C E P S (J1) F F VRS1 T1 2 1 CN - A 1 G F G H H Figure S-4.
R-320FK R-320FQ R-320FW 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- 320 FK R- 320 FQ R-320FW REF. NO. 4-11 4-12 4-13 4-14 4-15 4-16 4-17 4-18 4-19 4-20 4-21 4-22 4-23 4-24 4-25 4-26 PART NO.
R-320FK R-320FQ R-320FW 2 1 4 3 7-6 2-1 OVEN AND CABINET PARTS 6 5 7-8 A A 7-6 4-23 4-25 4-22 1-14 7-2 7-10 B 4-17 7-8 4-9 1-4 B 4-20 1-8 7-6 7-7 6-7 7-6 4-24 6-6 4-13 4-7 4-23 C C 4-11 7-6 7-3 4-10 4-21 7-3 D D 1-5 7-6 7-4 4-19 4-22 7-1 4-12 1-7 4-21 1-6 4-15 E 7-9 7-6 7-2 1-1 E 1-13 4-14 6-2 4-26 4-4 4-2 4-18 1-12 1-2 4-8 7-6 1-3 4-5 F 7-1 6-1 1-10 4-3 7-6 7-3 1-1 F 7-5 7-1 4-1 2-2 4-16 4-6 1-11 1-9 G 7-1 G 7-6 H H 7-6 7-6 7-6 2-
R- 320 FK R- 320 FQ R-320FW 2 1 4 3 6 5 CONTROL PANEL PARTS 3-2 A A 3-6 3-5 3-3 3-4 B B 3-1 3-6 DOOR PARTS C C 5-11 3-3-1 5-7 5-2 D 5-7 D 5-1 5-10 5-9 5-7 E E 5-7 5-3 5-7 5-10 5-9 F F 5-5 5-4 5-6 5-8 G G MISCELLANEOUS 6-3 6-5 H H Actual wire harness may be different from illustration.
R-320FK R-320FQ R-320FW 2 1 4 3 6 5 A A TOP PAD ASSEMBLY PACKING AND ACCESSORIES FPADBA458WRKZ PLASTIC SHEET (for R-320FK) SPADPA616WREZ B DOOR PROTECTION SHEET B CABINET COVER (for R-320FK/320FQ) SPADPA204WRE0 SPAKHA011WRE0 PLASTIC BAG SSAKHA034WRE0 FOAM SHEET SPAKHA012WREZ (for R-320FK/320FQ) C C 6-4 INSTRUCTION BOOK & PRINTING MATTER 6-2 BOTTOM PAD ASSEMBLY TURNTABLE TRAY FPADBA469WRKZ 6-1 TURNTABLE SUPPORT D D TRAY PACK INTO THE OVEN CAVITY SPADFA451WRE0 E Not replaceable
R- 320 FK R- 320 FQ R-320FW COPYRIGHT © 2002 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. 2002 SHARP CORP. (2S2.530E) Printed in U.S.