Sharp Carousel R-312AK Service Manual Download Page 9

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R-312AW
R-312AK

Figure O-2. Oven Schematic-Cooking Condition

SCHEMATIC

NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. COOKING TIME PROGRAMMED
3. VARIABLE COOKING CONTROL "HIGH"
4. "START" PAD TOUCHED

Figure O-1. Oven Schematic-Off Condition

SCHEMATIC

NOTE: CONDITION OF OVEN
1.

DOOR CLOSED

CLOCK APPEARS ON DISPLAY

FUSE 20A

120V AC

60 Hz

OVEN

LAMP

TURNTABLE

MOTOR

FAN

MOTOR

POWER

TRANSFORMER

CAPACITOR
0.94

MONITOR

SWITCH

RECTIFIER

MAGNETRON

PRIMARY
INTERLOCK
SWITCH

COM.

DOOR
SENSING
SWITCH

(RY-1)

(RY-2)

CONTROL UNIT

SECONDARY

INTERLOCK

RELAY

OVEN

THERMAL

CUT-OUT

MAGNETRON

THERMAL

CUT-OUT

NOISE FILTER

NOISE SUPPRESSION COIL

LINE CROSS CAPACITOR

0.22

F / AC 250V

LINE BYPASS

CAPACITOR

0.0033

F / AC 125V

LINE BYPASS

CAPACITOR

0.0033

F / AC 125V

N.O.

TTM

THIRD
DOOR
SWITCH

FUSE 20A

120V AC

60 Hz

OVEN

LAMP

TURNTABLE

MOTOR

FAN

MOTOR

POWER

TRANSFORMER

CAPACITOR
0.94

MONITOR

SWITCH

RECTIFIER

MAGNETRON

PRIMARY
INTERLOCK
SWITCH

COM.

DOOR
SENSING
SWITCH

(RY-1)

(RY-2)

CONTROL UNIT

SECONDARY

INTERLOCK

RELAY

OVEN

THERMAL

CUT-OUT

MAGNETRON

THERMAL

CUT-OUT

NOISE FILTER

NOISE SUPPRESSION COIL

LINE CROSS CAPACITOR

0.22

F / AC 250V

LINE BYPASS

CAPACITOR

0.0033

F / AC 125V

LINE BYPASS

CAPACITOR

0.0033

F / AC 125V

N.O.

TTM

THIRD
DOOR
SWITCH

Summary of Contents for Carousel R-312AK

Page 1: ...E 10 TOUCH CONTROL PANEL 15 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 19 PICTORIAL DIAGRAM 25 POWER UNIT CIRCUIT 26 CONTROL PANEL CIRCUIT 27 PRINTED WIRING BOARD 28 PARTS LIST 29 PACKING AND ACCESSORIES 33 S5707R312APK R 312AW R 312AK MICROWAVE OVEN MODELS R 312AW SERVICE MANUAL SHARP ELECTRONICS CORPORATION Service Headquarters Sharp Plaza Mahwah New Jersey 07430 2135 DEF LBS QTY CHECK ON PO...

Page 2: ...of hinges and latches 5 evidence of dropping or abuse c Before turning on microwave power for any service test or inspection within the microwave generating compartments check the magnetron wave guide or transmission line and cavity for proper alignment integrity and connections d Any defective or misadjusted components in the interlock monitor door seal and microwave generation and transmission s...

Page 3: ...mediately 1 800 237 4277 If the unit operates with the door open service person should 1 tell the user not to operate the oven and 2 contact SHARP ELECTRONICS CORPORATION and Food and Drug Administration s Center for Devices and Radiological Health immediately ServicepersonnelshouldinformSHARPELECTRONICSCORPORATIONofanycertifiedunitfound with emissions in excess of 4mW cm2 The owner of the unit sh...

Page 4: ...he center of the oven cavity The water container shall be a low form of 600 ml 20 oz beaker with an inside diameter of approx 8 5 cm 3 1 2 in and made of an electrically nonconductive material such as glass or plastic Theplacingofthisstandardloadintheovenisimportantnotonlytoprotecttheoven butalsotoinsurethatanyleakage is measured accurately 4 Set the cooking control on Full Power Cooking Mode 5 Cl...

Page 5: ...EN R 312AW R 312AK FOREWORD This Manual has been prepared to provide Sharp Electronics Corp Service Personnel with Operation and Service Informa tion for the SHARP MICROWAVE OVENS R 312AW R 312AK 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 sea...

Page 6: ...ull Power P 20 approx 20 of Full Power P 10 approx 10 of Full Power P 0 No power throughout the cooking time INSTANT ACTION pads COMPU DEFROST pad Number selection pads POWER LEVEL pad TIMER CLOCK pad STOP CLEAR pad START MINUTE PLUS pad Oven Cavity Light Yes Safety Standard UL and C UL Listed FCC Authorized DHHS Rules CFR Title 21 Chapter 1 Subchapter J Department of National Health and Welfare C...

Page 7: ... tripped over accidentally 3 Pronged Plug Grounded Receptacle Box Grounding Pin 3 Pronged Receptacle CAUTION DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE ROUND GROUNDING PRONG FROM THIS PLUG OVEN DIAGRAM 1 One touch door open button Push to open door 2 Door latches The oven will not operate unless the door is securely closed 3 Removable turntable support 4 Removable turntable The turntable wil...

Page 8: ...door switch are activated with the following results The circuits to the turntable motor the cooling fan motor and the high voltage components are de energized and the digital readout displays the time still remaining in the cook cycle when the door was opened 7 Themonitorswitchiselectricallymonitoringtheoperation of the primary interlock switch and it is mechanically associated with the door so t...

Page 9: ...INTERLOCK RELAY OVEN THERMAL CUT OUT MAGNETRON THERMAL CUT OUT NOISE FILTER NOISE SUPPRESSION COIL LINE CROSS CAPACITOR 0 22µF AC 250V LINE BYPASS CAPACITOR 0 0033µF AC 125V LINE BYPASS CAPACITOR 0 0033µF AC 125V H N A1 N O OL TTM FM THIRD DOOR SWITCH FUSE 20A 120V AC 60 Hz OVEN LAMP TURNTABLE MOTOR FAN MOTOR POWER TRANSFORMER CAPACITOR 0 94µF MONITOR SWITCH RECTIFIER MAGNETRON PRIMARY INTERLOCK S...

Page 10: ...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 simultaneouslywithclosingofthemonitorswitchcontacts CAUTION BEFORE REPLACING A BLOWN MONITOR FUSE TEST THE PRIMARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER OPERATION REFER TO CHAP TER TEST PR...

Page 11: ...t light when door is opened Oven lamp does not go out when door is closed Oven lamp does not light in cook ing cycle Lights when door is opened Oven lamp does not light at all Ovenlamplightsbutfanmotorand turntable motor do not operate Oven does not go into cook cycle when START pad is touched Oven seems to be operating but little or no heat is produced in oven load Food incompletely cooked or not...

Page 12: ... of the water with a thermometer or thermocouple temperature tester Stir the thermometer or thermocouple through the water until the temperature stabilizes Record the temperature of the water 2 Place the cup of water in the oven Operate oven at POWER 10 HIGH selecting more than 60 seconds cook time Allow the water to heat for 60 seconds measuring with a stop watch second hand of a watch or the dig...

Page 13: ... connect the ohmmeter to the common COM and normally open NO terminal of the switch The meter should indicated an open circuit with the door open and a closed circuit with the door closed If improper operation is indicated replace the primary interlock switch SECONDARY INTERLOCK SYSTEM TEST DOOR SENSING SWITCH Isolate the switch and connect the ohmmeter to the common COM and normally open NO termi...

Page 14: ...he 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 2 Control Unit The following symptoms indicate a defective control unit Before replacing the control unit perform the Key unit test Procedure K to determine if control unit is faulty 2 1 In connection with pads a When touching th...

Page 15: ...en 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 K KEY UNIT TEST If the display fails to clear when the STOP CLEAR pad is depressed first verify the flat ribbon cable is making good contact verify that the door sensing s...

Page 16: ...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 STEPS OCCURRENCE CAUSE OR CORRECTION 1 The rated AC voltage is not present between Check supply voltage and oven power cord Pin No 3 of the 2 pin connector A and the common terminal of the...

Page 17: ...a signal which resets the LSI to the initial state when power is supplied 2 Indicator Circuit This circuit consists of 12 segments and 3 common electrodes using a Liquid Crystal Display 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...

Page 18: ...esponding signal will be input into R63 17 AIN0 IN To input signal which communicates the door open close information to LSI Door close H level signal 0V Door open L level 5V 18 20 AIN1 AIN3 IN Terminal to change functions according to the Model ByusingtheA DconvertercontainedintheLSI DCvoltageinaccordancewiththeModel in operation is applied to set up its function 21 VSS IN Power source voltage 5V...

Page 19: ...ys on key matrix is touched 31 R91 OUT Key strobe signal Signal applied to touch key section A pulse signal is input to R60 R63 terminal while one of G3 line keys on key matrix is touched 32 R92 OUT Terminal not used 33 XIN IN Internal clock oscillation frequency setting input The internal clock frequency is set by inserting the capacitor and resistor circuit with respect to XOUT terminal 34 XOUT ...

Page 20: ...t 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 For those models therefore it is possible to check and repair the controls of the touch control panel while keeping it apart from the oven proper in this case you must short both ends of the door sensing switch on PWB of the to...

Page 21: ...ate right 6 Remove the one 1 terminal insulator and tube from filament lead longer one of power transformer Re install 1 Install the terminal insulator to receptacle of filament 1 Open covers of the terminal insulator by using small flat type screw driver 2 Remove the receptacle from the terminal insulator 3 Now the terminal insulator is free Installation 1 Insert the receptacle into terminal insu...

Page 22: ...guide 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 Re install 1 Re install the magnetron to waveguide flange with the two 2 screws diagonally as shown in Figure C 1 2 Insert the two 2 tabs of the chassis support to the oven cavity front plate and the back plate 3 Re install the chassis support to magnetron ...

Page 23: ...olding 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 oven from power supply and remove outer case 2 Discharge high voltage capacitor 3 Disconnect wire leads from the door sensing switch and the oven cavity front flange 4 Disconnect the wire leads from panel components 5 Make one 1 tab of the ov...

Page 24: ...peenhammer or rubber mallet CAUTION Do not hit the fan blade strongly when installed because the bracket may be disfigured Make sure that the fan blade rotates smooth after installation Make sure that the axis of the shaft is not slanted 3 Catch three holes of fan duct on three tabs of the waveguide flange 4 Install the fan duct assembly to the oven cavity with the one 1 screw 5 Insert the snap of...

Page 25: ...ging parts as shown in Figure C 8 4 Try the principles of the lever and lift up the door stopper 5 Now the door stopper is free from the door assembly 6 Release two 2 pins of door panel from two 2 holes of upper and lower oven hinges by lifting up 7 Now door assembly is free from oven cavity 8 Insert an putty knife thickness of about 0 5mm into the gap between the choke cover and door frame as sho...

Page 26: ...nic seal preventing the leakage of microwave energy from oven cavity during cook cycle Thisfunctiondoesnotrequirethatdoorbeair tight moisture condensation tight or light tight Therefore occasionalappearanceofmoisture light or sensing of gentle warm air movement around ovendoorisnotabnormalanddonotofthemselves indicate a leakage of microwave energy from oven cavity Pin Pin Upper oven hinge Lower ov...

Page 27: ...d to the terminal with blue mark on the oven light socket POWER TRANSFORMER COM NO CN A 1 2 RED 3 WHT WHT BLK WHT RED WHT RED GRY GRN RED GRY WHT BLK GRY RY2 COM RY2 N O GRY GRN RED BLK OVEN THERMAL CUT OUT MAGNETRON THERMAL CUT OUT FAN MOTOR BLK WHT BRN GRY PRIMARY INTERLOCK SWITCH COM NO BLK RED RED BRN THIRD DOOR SWITCH OVEN SIDE RED BLK RED GRY RED N H WHT BLK GRY BLK WHT GRN POWER SUPPLY CORD...

Page 28: ...9 B 1 B 2 T1 AC AC SH B SH A MICRO NOTE IF NOT SPECIFIED 1 4w 5 IF NOT SPECIFIED 1SS270A TURNTABLE MOTOR OVEN LAMP FAN MOTOR 1 WH 1 R4 27 R5 4 7k R3 910 1 2w R6 3 3k SP1 VRS1 C1 0 1µ 50v C5 10µ 35v C2 1000µ 25v J1 D5 D3 D4 D2 D1 a c d b D6 RY1 D7 D8 RY2 J2 Q2 2SA933 D1 D4 11ES1 Q3 KRC243M VR VR VR LD1 LD5 LD1 LD2 LD3 LD4 LD5 A 1 N O COM 2 3 4 ...

Page 29: ...v C61 330p 50v R13 15k D10 R11 15k R71 10kF R10 1k ZD10 UDZ4 3B J11 J13 J15 4 7k x 3 Q10 2SA1037AK C10 0 01µ 25v C12 0 01µ 25v 0 01µ 25v C40 C71 IC1 IZA758DR C11 47µ 16v C13 0 1µ 50v C70 0 01µ 25v R12 15k NC GND VC INT BUZZER RY1 RY2 RY3 DOOR SWITCH NOTEH IF NOT SPECIFIED 1 10w 5 IF NOT SPECIFIED 1SS355 LIQUID CRYSTAL DISPLAY KEY UNIT ON DEF LBS QTY CHECK R57 15k R58 15k R59 15k R60 15k R40 15k D2...

Page 30: ...r Unit 0 0 0 LD1 LD2 LD3 LD4 LD5 WH 1 SH A GREEN SH B R2 J4 Q2 Q1 C5 T1 6 1 1 3 3 7 4 4 RY1 RY2 HVT DU DU OMIF OMIF AC COM OL FM AC VH XH 1 3 1 3 CN A TTM 1 E E R4 D6 D5 C4 B B 1 1 1 2 2 DIP CN C 9 R5 R1 ZD1 CN B DOOR SW C3 R6 SP1 D7 Q3 J3 J2 J1 6 7 C1 D4 D2 D1 D3 C2 B E R3 D9 D8 VRS1 RY3 LOT NO F 2 3 4 5 1 2 WH 1 ...

Page 31: ...LD A171WRF0 LED holder 1 AE C1 RC KZA087DRE0 Capacitor 0 1uF 50V 1 AB C2 VCEAB31EW108M Capacitor 1000uF 25V 1 AE C5 VCEAB31VW106M Capacitor 10uF 35V 1 AA D1 4 VHD11ES1 1 Diode 11ES1 4 AB D5 8 VHD1SS270A 1 Diode 1SS270ATA 4 AA LD1 5 VHPSLZ381A9 3 Light emitting diode 5 AC Q2 VS2SA933S 3 Transistor 2SA933 1 AB Q3 VSKRC243M 3 Transistor KRC243M 1 AB R3 VRD B12HF911J Resistor 910 ohm 1 2W 1 AA R4 VRD ...

Page 32: ...oor frame R 312AW 1 AY 5 4 HPNL A662WRE0 Door screen R 312AK 1 AK 5 4 HPNL A663WRR0 Door screen R 312AW 1 AL 5 5 GCOVHA370WRF0 Choke cover 1 AM 5 6 LSTPPA139WRF0 Latch head 1 AF 5 7 MSPRTA084WRE0 Latch spring 1 AB 5 8 PCUSUA481WRP0 Cushion 1 AB 5 9 PCUSUA452WRP0 Cushion 1 AB 5 10 XCPSD40P08000 Screw 4mm x 8mm 1 AA 5 11 XCPSD40P08WN2 Screw 4mm x 8mm 1 AC MISCELLANEOUS 6 1 FROLPA079WRK0 Turntable su...

Page 33: ...CTION BOOK PRINTING MATTER 6 1 TURNTABLE SUPPORT TRAY PACK SPADFA397WRE0 INTO THE OVEN CAVITY CABINET COVER R 312AK only SPAKHA003WRE0 INFORMATION FOR PARTS CHANGE The instruction book will be changed from June 1997 production Serial number from 9706xxxxx Interchangeability A OLD NEW B OLD NEW C OLD NEW D OLD NEW REPLACEMENT PART NO Interchange EFFECTIVE REF NO DESCRIPTION OLD No Q ty NEW No Q ty ...

Page 34: ... 18 7 2 4 16 7 3 4 1 7 6 1 5 7 3 6 2 7 3 7 7 7 7 1 1 1 1 1 1 4 8 1 7 4 4 7 5 7 5 7 1 4 3 7 5 6 1 7 1 1 9 4 6 1 8 6 12 4 17 1 4 4 22 4 7 4 12 4 14 1 12 7 1 4 20 4 13 4 15 1 14 4 19 2 3 7 1 1 5 4 5 4 21 1 3 1 6 7 1 7 6 7 6 7 6 7 6 2 5 2 4 7 6 7 6 2 4 7 6 2 2 4 11 4 9 4 10 1 13 7 1 7 3 6 9 6 6 1 11 1 10 6 7 7 6 1 2 7 1 1 3 ...

Page 35: ...E F G H CONTROL PANEL PARTS 4 2 5 2 5 5 5 1 5 3 5 6 5 7 5 9 Actual wire harness may be different from illustration 6 4 6 5 6 3 HIGH VOLTAGE TRANSFORMER CAPACITOR 6 11 5 11 5 10 5 4 5 8 5 6 10 3 2 3 4 3 3 3 6 3 5 3 7 3 7 3 7 3 1F 3 1 3 3 1 MISCELLANEOUS PARTS DOOR PARTS ...

Page 36: ...34 R 312AW R 312AK 97 SHARP CORP 3U0 600E Printed in Japan ...

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