R-312AW R-312AK SERVICE MANUAL S5707R312APK/ MICROWAVE OVEN MODELS ON DEF. LBS. QTY.
R-312AW R-312AK 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-312AW R-312AK BEFORE SERVICING Before servicing an operative unit, perform a microwave emission check as per the Microwave Measurement Procedure outlined in this service manual. If microwave emissions level is in excess of the specified limit, contact SHARP ELECTRONICS CORPORATION immediately @1-800-237-4277.
R-312AW R-312AK 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-312AW R-312AK SERVICE MANUAL PRODUCT DESCRIPTION MICROWAVE OVEN GENERAL INFORMATION R-312AW / R-312AK FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVENS, R-312AW, R312AK. 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. Check the interlock switches and the door seal carefully.
R-312AW R-312AK SPECIFICATION ITEM Power Requirements Power Output Case Dimensions Cooking Cavity Dimensions 0.9 Cubic Feet Control Complement DESCRIPTION 120 Volts / 13.0 Amperes 60 Hertz Single phase, 3 wire grounded 1000 watts (IEC-705 TEST PROCEDURE) Operating frequency of 2450MHz Width 20-1/2" Height 11-7/8" Depth 15-7/8" Width 13-3/4" Height 8-3/8" Depth 14-7/8" Touch Control System Clock ( 1:00 - 12:59 ) Timer (0 - 99 min. 99 seconds) Microwave Power for Variable Cooking Repetition Rate; P-HI ...
R-312AW R-312AK Electrical Requirements The electrical requirements are a 115 -120 volt 60 Hz, AC only, 15 or 20 amp. 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. A short power-supply cord is provided to reduce risks of becoming entangled in or tripping over a longer cord.
R-312AW R-312AK OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during oven operation. (2) When the door is closed from the open position, the monitor switch contacts first open, and then the contacts of the primary interlock switch, door sensing switch and third door switch close.
N 7 N.O. CONTROL UNIT SECONDARY INTERLOCK RELAY FAN MOTOR DOOR SENSING SWITCH N.O. FAN MOTOR DOOR SENSING SWITCH PRIMARY INTERLOCK SWITCH THIRD DOOR SWITCH COM. Figure O-2. Oven Schematic-Cooking Condition MAGNETRON MONITOR SWITCH B2 B1 A1 OL H MAGNETRON THERMAL CUT-OUT OVEN THERMAL CUT-OUT POWER TRANSFORMER FM TTM TURNTABLE MOTOR OVEN LAMP LINE BYPASS CAPACITOR 0.0033µF / AC 125V SECONDARY INTERLOCK RELAY RECTIFIER (RY-2) (RY-1) A3 LINE BYPASS CAPACITOR 0.
R-312AW R-312AK DESCRIPTION AND FUNCTION OF COMPONENTS switch, the primary interlock switch and third door switch contacts close. (On opening the door, each of these switches operate inversely.) 3. If the door is opened, and primary interlock switch contacts fail to open, the monitor fuse blows simultaneously with closing of the monitor switch contacts. DOOR OPEN MECHANISM The door is opened by pushing the open button on the control panel, refer to the Figure D-1.
R-312AW R-312AK TROUBLESHOOTING GUIDE 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-312AW R-312AK TEST PROCEDURES PROCEDURE LETTER A COMPONENT TEST MAGNETRON ASSEMBLY TEST HIGH VOLTAGES ARE PRESENT DURING THE COOK CYCLE, SO EXTREME CAUTION SHOULD BE OBSERVED. DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING. 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-312AW R-312AK TEST PROCEDURES PROCEDURE LETTER D COMPONENT TEST HIGH VOLTAGE CAPACITOR TEST DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING. If the capacitor is open, no high voltage will be available to the magnetron. Disconnect input leads and check for short or open between the terminals using an ohmmeter.
R-312AW R-312AK TEST PROCEDURES PROCEDURE LETTER H COMPONENT TEST BLOWN MONITOR FUSE If the monitor fuse is blown when the door is opened, check the primary interlock switch and monitor switch according to the "TEST PROCEDURE" for those switches before replacing the blown monitor fuse. CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE, TEST THE PRIMARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER OPERATION.
R-312AW R-312AK TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST c) Cooking is not possible. Note: When defective components, the Power Unit or Key Unit are replaced, the defective part or parts must be properly packed for return in the shipping carton, with its cushion material, in which the new replacement part was shipped to you.
R-312AW R-312AK TEST PROCEDURES PROCEDURE LETTER N COMPONENT TEST PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD (PWB) IS OPEN To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary on the PWB, this foil pattern acts as a fuse. If the foil pattern is open, follow the troubleshooting guide given below for repair. Problem: POWER ON, indicator does not light up.
R-312AW R-312AK TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units. 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. (1) Key Unit (2) Control Unit (The Control Unit consists of Power Unit and CPU Unit).
R-312AW R-312AK DESCRIPTION OF LSI LSI(IZA758DR) The I/O signal of the LSI(IZA758DR) is detailed in the following table. Pin No. 1-12 Signal SEG0-SEG11 I/O OUT Description 13 R60 IN Signal coming from touch key. When either G12 line on key matrix is touched, a corresponding signal out of R73, R81R83 and R90-R91 will be input into R60. When no key is touched, the signal is held at "H" level. 14 R61 IN Signal similar to R60.
R-312AW R-312AK Pin No. 25 Signal R73 I/O OUT 26 INT2 IN Description Key strobe signal. Signal applied to touch-key section. A pulse signal is input to R60 - R63 terminal while one of G8 line keys on key matrix is touched. Signal synchronized with commercial power source frequency. This is the basic timing for time processing of LSI. H : GND L : -5V 16.7 msec. 27 R81 OUT Key strobe signal. Signal applied to touch-key section.
R-312AW R-312AK 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-312AW R-312AK COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE CAUTION: DISCONNECT OVEN FROM POWER SUPPLY BEFORE REMOVING OUTER CASE. DISCHARGE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING AFTER REMOVING OUTER CASE. WARNING FOR WIRING 3) Sharp edge: Bottom plate, Oven cavity, Waveguide flange, Chassis support and other metallic plate. 4) Movable parts (to prevent a fault) Fan blade, Fan motor, Switch, Switch lever, Open button. 3.
R-312AW R-312AK MAGNETRON REMOVAL Removal 1. Disconnect oven from power supply and remove outer case. 2. Discharge high voltage capacitor. 3. Disconnect wire leads from magnetron. 4. Remove the one (1) screw holding chassis support to magnetron. 5. Remove the chassis support from oven. 6. Carefully remove the two (2) screws holding magnetron to waveguide flange. 7. Lift up magnetron with care so that magnetron antenna is not hit by any metal object around antenna. 8. Now, the magnetron is free.
R-312AW R-312AK OVEN LAMP AND LAMP SOCKET REMOVAL 1. Disconnect oven from power supply and remove outer case. 2. Discharge high voltage capacitor. 3. Bend the tab of the partition angle holding the lamp socket. 4. Lift up the oven lamp socket. 5. Pull the wire leads from the oven lamp socket by pushing the terminal hole of the oven lamp socket with the small flat type screw driver. 6. Now, the oven lamp socket is free.
R-312AW R-312AK COOLING FAN MOTOR REMOVAL fan duct. 12.Now, the fan motor is free. 1. Disconnect oven from power supply and remove outer case. 2. Discharge high voltage capacitor. 3. Disconnect the wire leads from the fan motor. 4. Remove one (1) screw holding the chassis support to magnetron. And remove chassis support. 5. Release the snap of the main wire harness from the fan duct. 6. Remove one (1) screw holding the fan duct assembly to oven cavity. 7.
R-312AW R-312AK DOOR SENSING / THIRD DOOR/ PRIMARY INTERLOCK AND MONITOR SWITCHES ADJUSTMENT should be less than 0.5mm. 2. The door sensing switch, third door switch and primary interlock switch interrupt the circuit before the door can be opened. 3. Monitor switch contacts close when door is opened. 4. Re-install outer case and check for microwave leakage around door with an approved microwave survey meter. (Refer to Microwave Measurement Procedure.
R-312AW R-312AK 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. Door is positioned with its face pressed toward cavity face plate. 4. Check for microwave leakage around door with an approved microwave survey meter.
1 2 PRIMARY INTERLOCK RELAY 1 WHT 2 3 RED CN-A 3 25 4 5 NO NO Figure S-1. Pictorial Diagram 6 RED RED BLK BRN BRN BLK TURNTABLE MOTOR WHT RED BLK WHT RED RED GRY RED GRY POWER TRANSFORMER MAGNETRON HIGH VOLTAGE COMPONENTS RED N H HIGH VOLTAGE CAPACITOR WHT BLK 5 COM. INTERLOCK SWITCH PRIMARY COM. SWITCH GRY COM. MONITOR SWITCH N.C.
R-312AW R-312AK 2 1 4 3 LD1 LD2 LD3 LD4 LD5 LD1-LD5 A 6 5 A WH-1 VR R4 27 A3 3 1 d 2 4 D4 D2 C a B R5 4.7k D6 C1 D1 D3 VRS1 AC D5 Q2 2SA933 b + – C2 C2 1000µ/25v T1 C1 0.1µ/50v B D1-D4 11ES1 C3 C VR (J1) R3 910 1/2w SP1 D E C4 c TURNTABLE MOTOR OVEN LAMP FAN MOTOR A1 MICRO N.O. D C5 RY1 D7 R6 3.
C4 3 27 4 C8 C7 C6 NOTEH R14 15k R13 15k C20 0.
R-312AW R-312AK 2 1 4 3 6 5 WH-1 A A 1 LD1 LD2 LD3 LD4 LD5 00 B C5 2 D (CN - B) DOOR SW (ZD1) C2 (7) E FM 1 (1) T1 RY1 OL E (J3) (J2) 6 Q3 SH-B E (Q1) B E (R2/J4) B D7 1 (R1) C SH-A (GREEN) (C3) (D9) D8 D 1 2 WH-1 4 5 SP1 1 (C4) R3 R6 Q2 2 3 B DIP 0 D5 R5 C E 9 CN - C B R4 D6 1 2 7 6 1 1 TTM C1 VRS1 D4 D2 D1 F 4 D3 (4) RY2 HVT AC (COM) (J1) 3 (3) 3 VH CN - A XH 3 AC F (RY3) G DU OMIF DU OMIF G F LOT NO.
R-312AW R-312AK PARTS LIST REF. NO. PART NO.
R-312AW R-312AK REF. NO. 4-10 4-11 4-12 4-13 4-14 4-15 4-16 4-17 4-18 4-19 4-20 4-21 4-22 PART NO.
R-312AW R-312AK INFORMATION FOR PARTS CHANGE The instruction book will be changed from June 1997 production (Serial number from 9706xxxxx). ↔ Interchangeability A. OLD NEW REF.NO. 6- 8 B. OLD → NEW ← NEW REPLACEMENT PART NO. OLD No. Q'ty NEW No. DESCRIPTION Instruction book C. OLD TCADCA630WRR0 1 TCADCA642WRR0 D.
R-312AW R-312AK 2 1 A 4 3 6 5 A OVEN AND CABINET PARTS 2-1 7-5 4-18 B B 7-5 1-11 7-5 1-10 4-9 7-1 7-3 C C 7-4 6-7 4-10 4-22 7-2 1-13 1-8 1-4 6-12 4-16 4-17 D D 1-5 7-6 7-3 4-7 4-1 7-3 1-3 E E 1-2 4-15 6-9 1-6 4-12 7-1 1-1 7-5 7-1 7-1 1-7 7-7 4-20 4-14 7-5 1-1 7-3 4-8 4-4 6-6 1-3 F F 1-12 4-3 2-2 1-1 4-11 7-7 7-5 4-13 4-5 7-1 7-1 4-6 1-14 4-21 4-19 G 7-6 G 1-9 2-4 1-5 6-2 7-6 2-3 7-1 2-5 7-6 7-6 7-6 6-1 H H 7-6 7-6 1 2 7-6 2-4
R-312AW R-312AK 2 1 4 3 6 5 3-7 3-1F A CONTROL PANEL PARTS 3-4 A 3-7 3-2 3-3 B B 3-3-1 3-7 3-1 3-5 C C 3-6 4-2 5 5-5 5-11 DOOR PARTS D D 5-2 5-10 5-1 5-8 5-4 E E 5-3 F F 5-9 5-6 5-7 G G MISCELLANEOUS PARTS 6-3 (HIGH VOLTAGE TRANSFORMER) (CAPACITOR) 6-4 H Actual wire harness may be different from illustration.
R-312AW R-312AK '97 SHARP CORP. (3U0.
