Sharp R-1850 Service Manual Download Page 48

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R-1850
R-1851

'96 SHARP CORP. (8K5.550E) Printed in U.S.A

PACKING AND ACCESSORIES

TRAY HOLDER

DAMPER HOLDER

GREASE FILTER (x 2)

2-1

INSTALL MATERIAL ASSEMBLY

6-1

COOK BOOK

6-7

6-2

LOW RACK

6-10

6-3 OPERATION MANUAL

WALL TEMPLATE

INSTALLATION INSTRUCTION

6-4 TOP TEMPLATE

6-5

4-3 TURNTABLE TRAY

4-1 DAMPER ASSEMBLY

4-2 TURNTABLE

SUPPORT
ASSEMBLY

MILLER MAT

TOP PAD
SPADBB017MRE0

DOOR PROTECTOR

SPADP0221MRE0

BOTTOM PAD
SPADBB018MRE0

PACKING CASE
SPAKCB211MRR1 (R-1850)
SPAKCB211MRR2 (R-1851)

WRAP COVER
SSAKH0103MRE0

Non-replaceable items

HIGH RACK

6-9

TAPE

Summary of Contents for R-1850

Page 1: ...ey 07430 2135 TABLE OF CONTENTS Page PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICE TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY INSIDE FRONT COVER BEFORE SERVICING 1 MICROWAVE MEASUREMENT PROCEDURE 2 FOREWORD 3 PRODUCT SPECIFICATIONS 4 GENERAL INFORMATION 4 OPERATION 6 TROUBLESHOOTING GUIDE 14 TEST PROCEDURE 16 TOUCH CONTROL PANEL 23 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDUR...

Page 2: ...f 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 sy...

Page 3: ...ediately 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 sho...

Page 4: ...e 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 Clo...

Page 5: ...lly 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 Special attention should be given to avoid electrical shock and microwave radiation hazard SHARP ELECTRONICS CORPORATION SHARP PLAZA MAHWAH NEW JERSEY 07430 2135 PRODUCT DESCRIPTION GENERAL INFORMATION OPERATION TROUBLESHOOTING GUI...

Page 6: ...of Full Power P 10 approx 10 of Full Powe P 0 No power throughout the cooking time CUSTOM HELP pad SENSOR COOK pad COMPU BROIL pad COMPU ROAST pad COMPU BAKE pad SENSOR REHEAT pad MINUTE PLUS pad POPCORN pad COMPU DEFROST pad CONVECTION pad REHEAT pad LOW MIX BAKE pad HIGH MIX ROAST pad BROIL pad SLOW COOK pad KITCHEN TIMER pad Number and temperature selection pads CLOCK pad KEEP WARM pad TURNTABL...

Page 7: ...utton Push for On Off 10 Auto Touch control panel 11 Time display Digital display 99 minutes 99 seconds 12 Ventilation openings 13 Light Cover 14 Grease filters 15 Removable turntable The turntable will rotate clockwise or counterclockwise Only remove for cleaning 16 Removable turntable support 17 Plug 6 6 1 12 11 10 15 16 9 8 13 14 7 17 2 3 5 4 INTERACTIVE COOKING SYSTEM CUSTOM HELP SENSOR COOK C...

Page 8: ... out displays the time still remaining in the cook cycle when the door was opened 7 Themonitorswitchiselectricallymonitoringtheoperation 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 a closed position the primaryinterlockrelayandsecondaryinterlockswitch open th...

Page 9: ...tch contacts which send a signal to the control unit de energizing shut off relay RY6 AUTOMATIC MIX COOKING CONDITION Touch the LOW MIX BAKE or HIGH MIX ROAST pad The LOW MIX BAKE pad is preprogrammed for 325 F with 10 microwave power while the HIGH MIX ROAST pad is preprogrammed for 325 F with 30 microwave power Program desired cooking time When the START pad is touched the following operations o...

Page 10: ...n the oven lamp turntable motor cooling fan motor and convection motor The power supply voltage is applied to the heating element 4 Now the oven is in the convection cooking mode or Automatic Mix Cooking condition 5 Whentheoventemperaturehasreachedtheprogrammed convection temperature the oven goes into the programmed cooking mode 6 At the end of the cooking cycle the damper is returned to the open...

Page 11: ... the conventional range below is drawn in by the hood fan motor through the grease filters at the right and left sides of the base cover up through the right and left side intake ducts then discharged vertically at rear center top of the oven into the customer s vent system 2 HORIZONTAL VENTING The air handing is same as VERTICAL VENTING except that the final air discharge is directed horizontally...

Page 12: ... SWITCH DAMPER SWITCH THERMISTOR SECONDARY INTERLOCK SWITCH RED YLW GRY WHT WHT 120 V AC 60 Hz HOOD LAMP HL HL DM RY6 RY5 RY4 RY7 RY1 RY3 RY2 PRIMARY INTERLOCK RELAY FM CM OL TTM STM BRN HOOD FAN THERMAL CUT OUT HOOD CAPACITOR RY9 RY10 RY8 MAGNETRON TEMPERATURE FUSE FUSE 20A RED BLK BLK GRY GRY GRY BRN BRN PNK GRY DAMPER MOTOR FAN MOTOR TURNTABLE MOTOR CONVECTION MOTOR GRY BLU GRY GRY GRN WHT WHT ...

Page 13: ...TOR C3 C9 C5 C7 A1 A3 C1 A5 B5 B3 B1 B7 E1 E5 E6 E3 E4 E2 F1 F2 F3 DOOR SENSING SWITCH DAMPER SWITCH THERMISTOR SECONDARY INTERLOCK SWITCH RED YLW GRY WHT WHT 120 V AC 60 Hz HOOD LAMP HL HL DM RY6 RY5 RY4 RY7 RY1 RY3 RY2 PRIMARY INTERLOCK RELAY FM CM OL TTM STM BRN HOOD FAN THERMAL CUT OUT HOOD CAPACITOR RY9 RY10 RY8 BRN YLW YLW PPL PPL MAGNETRON TEMPERATURE FUSE FUSE 20A RED BLK BLK GRY GRY GRY B...

Page 14: ...open the monitor fuse blows simultaneously with closing of the monitor switch contacts CAUTION BEFORE REPLACING A BLOWN MONITOR FUSE TEST THE DOOR SENSING SWITCH PRIMARYINTERLOCKRELAY SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER OPERATION RE FER TO CHAPTER TEST PROCEDURE NOTE MONITOR FUSE AND SWITCH ARE REPLACED AS AN ASSEMBLY TEMPERATURE FUSE MG The temperature fuse located near the w...

Page 15: ...lement is de energized and the convection fan stops operating and the oven shuts off DAMPER OPEN CLOSE MECHANISM Usually the damper is in the open position except during convection cooking Damper position is set automatically by damper motor damper switch and motor cam These com ponents are operated by a signal that judges if microwave cooking or convection cooking operation is selected by the con...

Page 16: ...r should be operating at low speed Hood lights do not turn on with pushed HOOD LAMP button Hood fan motor does not rotate at all with pushed FAN button Speed of the hood fan motor does not change when the FAN button is touched for this function Oven lamp does not light in cook cycle But it does light when door is opened Fan motor does not operate Oven lamp and turntable motor operate Turntable mot...

Page 17: ... CONVECTION MOTOR HOOD LAMP OR SOCKET HOOD MOTOR CAPACITOR SHORTED OR OPENED WIRING SHORTED IN POWER CORD NO POWER AT OUTLET LOW VOLTAGE M N O P Q R S S S S S S S S S S U V RE RE RE RE CK CK RE CK RE RECK CK IMPORTANT If the oven becomes inoperative because of a blown monitor fuse check the monitor switch primary interlock relay door sensing switch and secondary interlock switch before replacing t...

Page 18: ...owed carefully 1 Fill the measuring cup with 16 oz 453cc of tap water and measure the temperature 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 Placethecupofwaterintheoven OperateovenatPOWER10 P HI selectingmorethan60seconds cook time Allow the water to...

Page 19: ...rminals on the relay RY2 provided in the control panel assembly Check the state of the relay contacts using a ohmmeter The relay contacts should be open If the relay contacts are closed replace the circuit board entirely or the relay itself F PRIMARY INTERLOCK SYSTEM TEST Disconnect the oven from power supply Before performing this test make sure that the secondary interlock switch and the primary...

Page 20: ...emperature fuse indicates overheating of the magnetron assembly Check for restricted air flow to the magnetron through the opening in the chassis especially the cooling fan and cooling duct CAUTION IF THE TEMPERATURE FUSE INDICATES AN OPEN CIRCUIT AT ROOM TEMPERA TURE REPLACE THE TEMPERATURE FUSE J TEMPERATURE FUSE TEST A continuity check across the thermal cut out terminals should indicate an ope...

Page 21: ...he temperature experienced may be approx 30 F more or less than indicated on the display however in most cases the food cooking results will be satisfactory Difference in power supply voltage will also affect the oven temperature P CHECKING TEMPERATURE IN THE CONVECTION MODE The touch control panel consists of circuits including semiconductors such as LSI ICs etc Therefore unlike conventional micr...

Page 22: ...R pad making momentary contact If the control unit responds by 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 R KEY UNIT TEST S RELAY TEST Remove the outer cas...

Page 23: ... 3 5 1 4 Touch START pad 5 The oven will operate as follows MENU WEIGHT 1ST STAGE 2ND STAGE 3RD STAGE LBS LEVEL TIME LEVEL TIME LEVEL TIME CHICKEN 0 5 70 28sec 50 5sec 30 1min 28sec PIECES 6 If improper operation is indicated the control unit is probably defective and should be checked U PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD PWB IS OPEN V AH SENSOR TEST Checking ...

Page 24: ...the sensor cook operation proceed as follows 6 1 Fill approximately 200 milliliters 7 2 oz of tap water in a 1000 milliliter measuring cup 6 2 Place the container on the center of tray in the oven cavity 6 3 Close the door 6 4 Touch SENSOR COOK pad And touch the number pad 1 And touch the start pad 6 5 The oven will turn off automatically after the water is boiling bubling If new sensor dose not o...

Page 25: ...t is a Fluorescent Display Basically a Fluorescent Display is triode having a cath ode a grid and an anode Usually the cathode of a Fluorescent Display is directly heated and the filament serves as cathode The Fluorescent Display has 8 digits 16 segments are used for displaying figures The touch control section consists of the following units as shown in the touch control panel circuit 1 Key Unit ...

Page 26: ...ey is touched the signal is held at L level 12 AN0 IN Temperature measurement input OVEN THERMISTOR By inputting DC voltage corresponding to the temperature detected by the thermistor this input is converted into temoerature by the A D converter built into the LSI 13 P55 OUT Segment data signals The relation between signals and indicators are as follows Signal Segment Signal Segment P13 P16 P03 P8...

Page 27: ...s applied Temporarily set to L level the moment power is applied at this time the LSI is reset Thereafter set at H level 28 P71 OUT Magnetron high voltage circuit driving signal To turn on and off the cook relay RY2 In P HI operation the signals holds L level during mi crowave cooking and H level while not cooking In other cooking modes P 90 P 80 P 70 P 60 P 50 P 40 P 30 P 20 P 10 P 0 the signal t...

Page 28: ...d of the fluorescent display 41 44 P17 P14 OUT Digit selection signal Signal similar to P23 45 48 P13 P10 OUT Segment data signal Signal similar to P55 49 P07 OUT Segment data signal Signal similar to P55 50 P06 OUT Segment data signal Signal similar to P55 Key strobe signal Signal applied to touch key section A pulse signal is input to AN1 and P27 P24 terminal while one of G7 line keys on key mat...

Page 29: ... closed vessel 2 Absolute humidity g m Output voltage Absolute humidity vs output voltage characterist 3 DetectorCircuitofAbsoluteHumiditySensorCircuit This detector circuit is used to detect the output voltage of the absolute humidity circuit to allow the LSI to control sensor cooking of the unit When the unit is set in the sensor cooking mode a 16 seconds clearing cycle occurs Then the detector ...

Page 30: ...ncluded 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 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 bot...

Page 31: ...e two 2 screws holding the oven outer case cabinet to the top cabinet 4 Remove the two 2 grease filters from the base cover 5 While supporting the front of the oven unfasten the two 2 unit mounting screws holding the oven to the unit mounting plate 6 Lower the front of the oven and pull the power cord out of the wall cabinet 7 Lift the oven up off the hooks at the bottom of the mounting plate 8 Th...

Page 32: ... 3 Re connect wire leads primary and high voltage to the transformer and filament leads of transformer to magnetron and high voltage capacitor Refer to PICTORIAL DIAGRAM 4 Re install the hood intake duct R and the outer case and check that oven is operating properly CAUTION MAKE SURE THE WIRE LEADS NEVER TOUCH THE FAN BLADE HOOD FAN MOTOR HOOD EXHAUST DUCT OVEN LAMP SOCKET AND AH SENSOR REMOVAL 1 ...

Page 33: ...ltage capacitor 9 Now the high voltage rectifier assembly is free 10 Remove capacitor from the holder 11 Now the high voltage capacitor is free CAUTION WHEN REPLACING THE HIGH VOLTAGE RECTIFIER ASSEMBLY THE GROUND SIDE TERMINAL MUST BE SECURED FIRMLY WITH A GROUNDING SCREW HOOD FAN THERMAL CUT OUT REMOVAL 1 Unplug the oven from power outlet and remove the oven from wall and remove outer case Refer...

Page 34: ...xhaust duct from the oven cavity referring to the procedure of HOOD FAN MOTOR HOOD EXHAUST DUCT OVEN LAMP SOCKET AND AH SENSOR REMOVAL 3 Disconnect the wire leads from the stirrer motor STIRRER MOTOR REMOVAL 4 Remove the two 2 screws holding the stirrer motor to the waveguide of the oven cavity 5 Remove the stirrer motor from the waveguide 6 Now the stirrer motor is free 7 When install the stirrer...

Page 35: ...ked in alcohol 3 When attaching the key unit to the key fixing plate adjust the upper edge and right edge of the key unit to the correct position of key fixing plate 4 Stick the key unit firmly to the key fixing plate by rubbing with soft cloth not to scratch NOTESFORNEWCONTROLUNITREPLACEMENT 1 Before installation of the new CPU into the control panel grasp the middle section between thump and fin...

Page 36: ...ove the convection motor fan and one 1 washer holding the fan to convection motor shaft 22 Remove the E ring from the convection motor shaft 23 Remove two 2 screws holding the convection motor to convection motor mounting plate 24 Now the convection motor is free CONVECTION DUCT ASSEMBLY REMOVAL 1 Unplug the oven from power outlet and remove the oven from wall and remove outer case Refer to proced...

Page 37: ...Figure C 2 3 Remove the hood exhaust louver from the oven cavity by pushing right and left tabs of the hood exhaust louver as shown in Figure C 2 4 Remove the sash left from the oven cavity from face plate by lifting it up 5 Push the door open button and open the door slightly 6 Insert an putty knife thickness of about 0 5mm into the gap A between the door stopper and the choke cover as shown in F...

Page 38: ...oke cover and the door frame as shown Figure C 3 to free engaging parts 3 Try the principles of the lever and lift up the choke cover by inserting a putty knife in order shown in Figure C 3 4 Now choke cover is free from door panel and door frame DOOR FRAME 5 Remove six 6 screws holding the door panel to the door frame assembly 6 Release the door frame assembly from the door panel 7 Now door frame...

Page 39: ...KET to oven cavity front flange CN E CN F 1 2 YLW GRY CN A 5 4 RED GRY WHT WHT BLK BLK SECONDARY INTERLOCK SWITCH N O N C COM COM MONITOR SWITCH MONITOR FUSE AND FUSE HOLDER N O N O COM COM GRN GRN PNK N O COM DOOR SENSING SWITCH CN C CN E CN F CN A PRIMARY INTERLOCK RELAY RY3 RY1 RY9 RY7 CN F T1 1 2 RED WHT 3 AH SENSOR HOOD FAN MOTOR STIRRER MOTOR GRY BLK BLK BLK BLK 1 2 GRY GRY BRN BRN GRY PNK 1...

Page 40: ...FROST CONTROL UNIT 1 VREF AN7 AN6 AN5 AN4 AN3 AN2 AN1 AN0 P55 P30 P31 P32 P33 P34 P35 P36 P37 P00 P01 P02 P03 P04 P05 P06 P07 P10 P11 P12 P13 P14 P15 P16 P17 P20 P21 P22 P23 P24 P25 P26 P27 P54 P53 P52 P51 P50 P47 P46 P45 P44 P43 P42 P40 P71 P70 XIN XOUT VSS RST INT1 VCC VEE AVSS 12 A A B C B C C4 10µ 35v C6 10µ 35v C20 10µ 35v R30 15k R50 15k R63 220F R64 3 6kF R31 4 7k R62 36kF R51 4 7k C5 0 1µ ...

Page 41: ...D20 D21 48 46 40 42 CF1 ZD4 D30 D32 OVEN LAMP AC H ZD3 RY3 RY2 RY1 P S1 S2 RY9 RY10 RY8 IC2 IC1 BFB 29 30 31 32 33 2 27 15 43 38 C10 C2 Q90 16 R91 D31 R92 R93 50 R75 J6 J3 Q28 CONV H MICRO Q29 Q27 Q23 ZD2 Q20 D26 D23 D24 Q24 Q1 R3 R2 65 66 C3 R1 J1 RY7 C100 HOOD THERMO H M LOW H M HIGH COM HOOD LAMP CONV M DAMP M AC N MOTOR CAPACITOR T T M FAN M RY6 RY5 RY4 ZD1 D3 D4 D1 D2 64 Q25 Q26 Q30 D28 D27 J...

Page 42: ... 1850 1 AN 2 7 FANGKB010MRY0 M Hood lamp glass assembly R 1851 1 AM 2 7 1 LANGQB016MRP0 M Hood lamp glass angle R 1850 1 AG 2 7 1 LANGQB020MRP0 M Hood lamp glass angle R 1851 1 AG 2 7 2 PGLSPB004MRE0 M Hood lamp glass 1 AH 2 8 PCOVPB030MRE0 M Base cover R 1850 1 AX 2 8 PCOVPB031MRE0 M Base cover R 1851 1 AX 2 9 HDECQB016MRF0 M Sash left R 1850 1 AL 2 9 HDECQB017MRF0 M Sash left R 1851 1 AL 2 10 LS...

Page 43: ...P M 3 AH RY4 9 RRLY A075DRE0 J Relay OJE SS 124LM 6 AG RY10 RRLY B001MRE0 M Relay VE 24HSF K 1 AM SP40 RALM A014DRE0 J Buzzer PKM22EPT 1 AG T1 RTRNPB004MRE0 M Transformer 1 AN VRS1 RH VZA032DRE0 J Varistor 10G471K 1 AE ZD1 VHEHZ6A3 1 J Zener diode HZ6A 3 1 AC ZD2 VHEHZ161 1 J Zener diode HZ16 1 1 AA ZD3 VHEHZ5C2 1 J Zener diode HZ5C 2 1 AA ZD4 VHEHZ4A2 1 J Zener diode HZ4A 2 1 AA 3 2 FPNLCB153MRK0...

Page 44: ...n 1 AA 4 49 PCUSUB024MRP0 M Cushion 1 AD 4 50 PCUSGB031MRP0 M Cushion 1 AA DOOR PARTS 5 CDORFB166MRK0 M Door assembly complete R 1850 1 BL 5 CDORFB167MRK0 M Door assembly complete R 1851 1 BN 5 1 DDORFB069MRY0 M Door panel assembly 1 BB 5 2 GWAKPB058MRF0 M Door frame R 1850 1 AS 5 2 GWAKPB059MRF0 M Door frame R 1851 1 AS 5 3 PGLSPB008MRR0 M Door glass front R 1850 1 AV 5 3 PGLSPB010MRR0 M Door gla...

Page 45: ...XOTSD40P12000 M Screw 4mm x 12mm 24 AA 7 8 XOTSF40P10000 M Screw 4mm x 10mm R 1850 1 AA 7 8 XOTSC40P10000 M Screw 4mm x 10mm R 1851 1 AA 7 9 XBTSD40P08000 M Screw 4mm x 8mm 2 AA 7 10 LX BZB011MRE0 M Unit mounting screw 2 AH 7 11 LX CZA038WRE0 M Special screw 4 AA 7 12 XCBWW30P06000 M Screw 3mm x 6mm 5 AA 7 13 LX CZ0052WRE0 M Special screw 2 AA 7 14 XCTWW40P08RV0 M Screw 4mm x 8mm 2 AA 7 15 XRESD40...

Page 46: ... 1 6 1 16 2 9 1 20 2 7 2 3 1 14 2 4 1 14 4 30 4 32 6 14 1 22 4 26 1 11 1 11 4 34 4 43 4 13 7 25 4 9 4 12 6 12 7 18 4 14 4 19 4 17 7 6 7 24 4 13 4 8 1 4 7 22 7 22 1 12 1 9 1 2 4 4 4 31 4 49 4 29 4 28 4 47 2 8 1 20 4 33 7 19 7 12 7 12 1 20 1 8 1 11 1 10 7 5 4 27 7 16 2 1 2 1 7 10 7 10 4 42 1 5 7 20 7 1 4 48 1 19 7 9 4 50 4 21 4 23 1 1 4 41 4 15 7 13 1 7 4 5 4 6 2 2 4 3 4 2 7 25 7 8 2 7 2 2 7 1 7 2 4...

Page 47: ...C D E F G H A B C D E F G H CONTROL PANEL PARTS DOOR PARTS MISCELLANEOUS 5 2 4 35 5 3 5 8 5 5 5 4 5 6 5 1 5 9 5 5 9 5 7 3 2 3 3 3 4 7 7 3 4 3 1 3 2 2 3 2 3 3 2 5 3 2 1 3 2 4 3 2 6 6 6 6 8 6 9 6 10 6 11 6 1 6 1 1 6 1 2 6 1 3 6 1 7 6 1 5 6 1 6 6 1 4 ...

Page 48: ... 2 LOW RACK 6 10 6 3 OPERATION MANUAL WALL TEMPLATE INSTALLATION INSTRUCTION 6 4 TOP TEMPLATE 6 5 4 3 TURNTABLE TRAY 4 1 DAMPER ASSEMBLY 4 2 TURNTABLE SUPPORT ASSEMBLY MILLER MAT TOP PAD SPADBB017MRE0 DOOR PROTECTOR SPADP0221MRE0 BOTTOM PAD SPADBB018MRE0 PACKING CASE SPAKCB211MRR1 R 1850 SPAKCB211MRR2 R 1851 WRAP COVER SSAKH0103MRE0 Non replaceable items HIGH RACK 6 9 TAPE ...

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