R-320HK R-320HQ R-320HW SERVICE MANUAL S4309R320HPW/ MICROWAVE OVEN MODELS R-320HK R-320HQ R-320HW 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-320HK R-320HQ R-320HW 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-320HK R-320HQ R-320HW 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-320HK R-320HQ R-320HW 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-320HK R-320HQ R-320HW SERVICE MANUAL PRODUCT DESCRIPTION MICROWAVE OVEN R-320HK/ R-320HQ/ R-320HW GENERAL INFORMATION FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVENS,R-320HK,R-320HQ and R-320HW. 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-320HK R-320HQ R-320HW 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 12-1/4" Depth 17-1/4" Cooking Cavity Dimensions Width 14-3/4" Height 8-7/8" Depth 15-1/4" 1.2 Cubic Feet Control Complement Touch Control System Clock ( 1:00 - 12:59 ) Timer (0 - 99 min.
R-320HK R-320HQ R-320HW 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.
R-320HK R-320HQ R-320HW OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during oven operation. 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.
R-320HK R-320HQ R-320HW supplementary cooking is started. The time of supplementary 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. RO W 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.
R-320HK R-320HQ R-320HW SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. CLOCK APPEARS ON DISPLAY NOTE: " " indicates components with potential above 250V. AH SENSOR C/T FUSE TEMPERATURE FUSE 150˚C (OVEN) POWER TRANSFORMER N.O. F3 F1 F2 PRIMARY INTERLOCK RELAY (RY2) CAPACITOR 1µF AC 2300V MONITOR SWITCH CONTROL UNIT GRN COM. 120V AC 60 Hz OVEN LAMP RELAY (RY1) N.O.
R-320HK R-320HQ R-320HW DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM 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, PRIMARY INTERLOCK RELAY (RY2), SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER OPERATION. (REFER TO CHAPTER "TEST PROCEDURE"). NOTE: C/T FUSE AND MONITOR SWITCH ARE REPLACED AS AN ASSEMBLY.
R-320HK R-320HQ R-320HW 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-320HK R-320HQ R-320HW CK = Check / RE = Replace Home fuse or circuit breaker blows when power cord is plugged into wall receptacle C/T 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-320HK R-320HQ R-320HW 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-320HK R-320HQ R-320HW TEST PROCEDURES PROCEDURE LETTER C COMPONENT TEST HIGH VOLTAGE RECTIFIER TEST 1. 2. 3. 4. 5. 6. 7. 8. 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.
R-320HK R-320HQ R-320HW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 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 the door closed.
R-320HK R-320HQ R-320HW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 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. 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-BA034WRKZ, even if the monitor switch operates normally.
R-320HK R-320HQ R-320HW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 3. If the Key unit or the Control unit is defective. 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) Replace the Control unit assembly. 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.
R-320HK R-320HQ R-320HW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST RY1 and RY2 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 RY1 Approx. 24.0V D.C.
R-320HK R-320HQ R-320HW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 1) 2) 3) 4) 5) 6) 7) 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 these leads remain isolated from other components and oven chassis by using insulation tape. After that procedure, re-connect the power supply cord. Follow the troubleshooting guide given below for repair.
R-320HK R-320HQ R-320HW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNIT To determine if the sensor is defective, the simplest method is to replace it with a new replacement sensor. (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) Remove the AH sensor. (5) Install the new AH sensor. (6) Reconnect all leads removed from components during testing.
R-320HK R-320HQ R-320HW 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-320HK R-320HQ R-320HW Pin No. Signal I/O Description 9 AN1 IN AH sensor input. This input is an analog input terminal from the AH sensor circuit, and connected to the A/D converter built into the LSI. 10 AN0 IN Used for initial balancing of the bridge circuit (absolute humidity sensor). This input is an analog input terminal from the AH sensor circuit, and connected to the A/D converter built into the LSI.
R-320HK R-320HQ R-320HW Pin No. Signal I/O Description 33 P27 OUT Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P70, P71, P41, P45, P47 and AN3 terminal while one of G8 line keys on key matrix is touched. 34 P26 OUT Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P70, P71, P41, P45, P47 and AN3 terminal while one of G7 line keys on key matrix is touched. 35 P25 OUT Key strobe signal. Signal applied to touch-key section.
R-320HK R-320HQ R-320HW Pin No. Signal I/O 79 COM0 OUT 80 VL3 IN Description Common data signal. Connected to LCD signal COM1. Power source voltage input terminal. Standard voltage for LCD. Connected to GND. 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.
R-320HK R-320HQ R-320HW TOUCH CONTROL PANEL SERVICING 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-320HK R-320HQ R-320HW 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-320HK R-320HQ R-320HW 6. Lift entire outer case from the unit. 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.
R-320HK R-320HQ R-320HW POSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVAL Terminal 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. Push the lever of positive lock® connector. 5. Pull down on the positive lock® connector. Positive lock® connector 1 Push Lever CAUTION: WHEN CONNECTING THE POSITIVE LOCK® CONNECTORS TO THE TERMINALS, CONNECT THE POSITIVE LOCK® SO THAT THE LEVER FACES YOU 2 Pull down Figure C-1.
R-320HK R-320HQ R-320HW TURNTABLE MOTOR REMOVAL 1. Disconnect the power supply cord. 2. Remove turntable and turntable support from oven cavity. 3. Lay the oven on it's backside. Remove the turntable motor cover by snipping off the material in four corners. 4. Where the corners have been snipped off bend corner areas flat. No sharp edges must be evident after removal of the turntable motor cover. 5. Disconnect wire leads from turntable motor. (See "Positive lock connector removal") 6.
R-320HK R-320HQ R-320HW 2. Reconnect wire leads to each switch. Refer to pictorial diagram. 3. Secure latch hook (with two (2) mounting screws) to oven flange. 4. Make sure that the monitor switch is operating properly and check continuity of the monitor circuit. Refer to chapter "Test Procedure" and Adjustment procedure. 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.
R-320HK R-320HQ R-320HW 14.Now, latch head and latch spring are free. 15.Remove door screen from door frame. 16.Now, door screen is free. REINSTALLATION 1. Reinstall door screen to door frame . 2. Reinstall the latch spring to the latch head. Reinstall the latch spring to the door frame. Reinstall latch head to door frame. 3. Reinstall door panel to door frame by fitting ten (10) tabs of door frame to ten (10) holes of door panel. 4. Put sealer film on door panel.
1 2 H 3 31 PNK RED BLK RED 3 1 2 4 GRY GRY RY1 T1 SP1 5 GRY WHT WHT RED Figure S-1. Pictorial Diagram TURNTABLE MOTOR GRY GRY BLK WHT RED C/T FUSE RED GRY PNK POWER SUPPLY CORD 120V 60Hz NOTE: The neutral (WHT) wire must be connected to the terminal with "N" mark on the power supply cord. HIGH VOLTAGE CAPACITOR POWER TRANSFORMER H.V. RECTIFIER MAGNETRON HIGH VOLTAGE COMPONENTS FAN MOTOR RED 4 COM. BLK MONITOR SWITCH COM. SECONDARY NO INTERLOCK SWITCH N.C.
NO COM DOOR SENSING SWITCH B-2 B-1 COM POWER TRANSFOMER AC(H) OVEN LAMP TURNTABLE MOTOR FAN MOTOR AC(N) NO F3 AH SENSOR CN-F F-2 F-1 WH-1 WH-1 c RY2 RY1 NOTE: D31 1SS270A D30 1SS270A (J1) 0.1uF 50V C2 HZ16- 1 SP1 Q4 DTA123JS 10u/ 35V C5 Q3 KRC243M IF NOT SPECIFIED 1/10W±5% POWER UNIT 27 1/4W 4.7K 1/4W Q2 2SB1238 R1 R4 R5 VA F3 F2 BL DOOR M NL COM BZ R96 3.57KD (F) (G) 0.
R-320HK R-320HQ R-320HW 1 2 4 3 5 6 A A DIP B B CHIP SIDE J3 CN-F C10 R90 C C C4 1 2 3 LED D31 CN-B R3 R5 C5 R6 2 Q2 E C B E C B J1 D8 D WH-2 B1 2 E Q1 Q4 SP1 Q3 DZ1 E C B D D30 2 1 J5 J6 1 WH-2 D5 T1 J2 R4 D6 R2 R7 E E RY2 C1 R8 D1 D2 F P F S L1 D3 D4 VRS1 G G C2 D7 RY1 H H Figure S-3.
R-320HK R-320HQ R-320HW 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-320HK R-320HQ R-320HW REF. NO. ∆ ∆ ∆ PART NO.
R-320HK R-320HQ R-320HW 2 1 4 3 6 5 7-10 OVEN AND CABINET PARTS 7-2 A A 7-10 7-10 2-1 B B 7-2 A 4-9 4-15 7-11 7-12 4-3 C 1-6 7-6 7-8 1-12 C 4-16 7-6 7-9 1-2 1-3 6-4 7-8 1-7 4-13 7-3 6-5 7-10 D D 7-10 1-8 A 4-4 4-6 7-3 7-7 7-10 7-8 4-8 E E 4-14 4-7 4-12 6-2 1-11 7-4 7-5 4-17 7-7 4-10 1-9 F 4-1 F 1-2 7-1 6-1 1-1 4-5 1-10 4-11 1-1 7-8 4-2 2-2 7-1 4-12 1-5 G G 1-4 2-3 7-10 2-3 H 7-10 4-12 H 4-12 2-3 7-10 7-10 1 2 2-3 4 3 36 5 6
R-320HK R-320HQ R-320HW 2 1 4 3 6 5 3-4 3-2 CONTROL PANEL PARTS A A 3-1 B B 3-4 DOOR PARTS 3-6 C C 5-7 3-5 D D 5-2 3-3 5-1 5-3 E E F F 5-4 5-6 5-5 MISCELLANEOUS G G 6-3 H H Actual wire harness may be different from illustration.
R-320HK R-320HQ R-320HW 2 1 4 3 6 5 PACKING AND ACCESSORIES A A TOP PAD ASSEMBLY FPADBA506WRKZ B B DOOR PROTECTION SHEET PLASTIC SHEET (for R-320HK) SPADPA204WRE0 SPADPA616WREZ PLASTIC BAG C C SSAKHA034WRE0 FOAM SHEET SPAKHA012WREZ (only for R-320HK) CABINET COVER SPAKHA011WRE0 (only for R-320HK) D D 6-6 INSTRUCTION BOOK BOTTOM PAD ASSEMBLY 6-2 TURNTABLE TRAY FPADBA508WRKZ E E 6-1 TURNRTABLE SUPPORT INTO THE OVEN CAVITY F F G PACKING CASE FPAK-A479WRKZ [R-320HK] FPAK-A480WRKZ
