Sharp R-820BK Service Manual Download Page 40

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R-820BK
R-820BW

Figure S-2. Power Unit Circuit

–

COM

N.O.

COM

N.O.

COM

N.O.

COM

N.O.

A 3

OVEN LAMP
TURNTABLE
MOTOR

BOTTOM
HEATER

TOP
HEATER

MICRO

DOOR SWITCH

OVEN THERMISTOR

AC120V
60Hz

LED

GND

INT

BUZZER

FAN MOTOR

CONVECTION
MOTOR

N.C.

OVEN
THERMISTOR

N.C.

MICRO

OVEN LAMP
TURNTABLE
MOTOR

BOTTOM
HEATER

TOP
HEATER

DOOR
SWITCH

FAN MOTOR

CONVECTION
MOTOR

Q2 2SB1238

R4 27

R5 4.7k

R3 510 1/2w

R2 510 1/2w

RY5

RY6

RY4

Q3
DTD143ES

C5
10

/35v

RY3

RY2

R6 3.3k

SP1

D1-4
11ES1

VRS1

(J1)

C1 0.1

/50v

C3 0.1

/50v

D12

D11

RY1

D10

C4 10

/35v

C2 470

/50v

10G471K

A 1

B 2

B 1

D 3

D 1

C12

C13

C17

C 7

C11

C 8

C14

C 6

C16

C15

C 5

C 4

C 9

C 1

C 3

C 2

C10

NOTE

: IF NOT SPECIFIED, 1/4w

: IF NOT SPECIFIED, 1SS270A

A 5

Summary of Contents for R-820BK

Page 1: ...VICE PERSONNEL 1 MICROWAVE MEASUREMENT PROCEDURE 2 FOREWORD AND WARNING 3 PRODUCT SPECIFICATIONS 4 GENERAL INFORMATION 4 OPERATION 6 TROUBLESHOOTING GUIDE 13 TEST PROCEDURE 15 TOUCH CONTROL PANEL 24 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 30 PICTORIAL DIAGRAM 37 POWER UNIT CIRCUIT 38 CPU UNIT CIRCUIT 39 PRINTED WIRING BOARD 40 PARTS LIST 41 PACKING AND ACCESSORIES 43 S5812R820BPW R 820BK R ...

Page 2: ...n and transmission systems shall be repaired replaced or adjusted by procedures described in this manual before the oven is released to the owner e A microwave leakage check to verify compliance with the Federal Performance Standard should be performed on each oven prior to releasing oven to the owner BEFORE SERVICING Before servicing an operative unit perform a microwave emission check as per the...

Page 3: ...e capacitor 4 Disconnect the leads to the primary of the power transformer 5 Ensure that the leads remain isolated from other components and oven chassis by using insulation tape 6 After that procedure reconnect the power supply cord When the testing is completed 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 Rec...

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: ...he door packing is not damaged D The door is not deformed or warped E There is no other visible damage with the oven Servicing and repair work must be carried out only by trained service personnel DANGER Certaininitialpartsareintentionallynotgroundedandpresent a risk of electrical shock only during servicing Service personnel Do not contact the following parts while the appliance is energized High...

Page 6: ... F Temp control Roast Cooking ROAST 325 F with 30 microwave power CUSTOM HELP pad COMPU COOK BAKE PIZZA GRILL ROAST pads COMPU DEFROST pad CONVEC pad GRILL pad ROAST pad POPCORN pad REHEAT pad MINUTE PLUS pad Number and temperature selection pads KITCHEN TIMER pad CLOCK pad STOP CLEAR pad POWER LEVEL pad START TOUCH ON pad Oven Cavity Light Yes Safety Standard UL Listed FCC Authorized DHHS Rules C...

Page 7: ... heaters 3 Oven door with see through window 4 Door hinges 5 Safety door latches 6 Door seals and sealing surfaces 7 Bottom heater 8 Oven cavity 9 Turntable motor shaft 10 Ventilation openings 11 Waveguide cover 12 One touch door opening button 13 Auto Touch control panel 14 Time display 15 Power supply cord 16 Outer cabinet 17 Menu label NOTE 1 Ensure that the bottom heater is in the lowest posit...

Page 8: ...gized the oven lamp remains on and the digital read out displays the time still remaining in the cook cycle when the door was opened 7 The monitor switch electrically monitors the operation 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 the closed position the r...

Page 9: ...t off relays RY5 and RY6 are energized the oven lamp cooling fan motor and turntable motor are turned on 3 The coil of relays RY3 and RY4 are energized by the control unit and the top heaters and the bottom heater work with 100 power The relay RY1 and the convection motor are not energized at this preheating condition NOTE If the cavity temperature is lower than 100 F 38C at 4 minutes and 15 secon...

Page 10: ...NSING FEATURE MICROWAVE MODE This model incorporates a sensing feature which will stop the oven s operation if there is a fire in the oven cavity during microwave cooking This is accomplished by the LSI repeatedly measuring the voltage across the temperature measurement circuit ther mistor during it s 32 seconds time base comparing the obtained voltage measurements If the most recent voltage measu...

Page 11: ...LU G Y EARTH LIVE NEUTRAL RY4 RY3 RY2 RY6 RY5 CM CONVECTION MOTOR THERMISTOR RY1 CAPACITOR 0 94µF AC2200V GRILL HEATER TOP BOTTOM HEATER MAGNETRON POWER TRANSFORMER B2 B1 A3 A5 D1 D3 SECONDARY INTERLOCK SWITCH THERMAL CUT OUT OVEN THERMAL CUT OUT MAG MONITOR SWITCH FUSE 20A 120V 60Hz OL FM TTM OVEN LAMP FAN MOTOR TURNTABLE MOTOR H V RECTIFIER CONTROL UNIT RPIMARY INTERLOCK RELAY COM COM COM N O CO...

Page 12: ...M COM COM N O COM N O N O N O A1 DOOR SENSING SWITCH BRN BLU G Y EARTH LIVE NEUTRAL RY4 RY3 RY2 RY6 RY5 CM CONVECTION MOTOR THERMISTOR RY1 CAPACITOR 0 94µF AC2200V GRILL HEATER TOP BOTTOM HEATER MAGNETRON POWER TRANSFORMER B2 B1 A3 A5 D1 D3 SECONDARY INTERLOCK SWITCH THERMAL CUT OUT OVEN THERMAL CUT OUT MAG MONITOR SWITCH FUSE 20A 120V 60Hz OL FM TTM OVEN LAMP FAN MOTOR TURNTABLE MOTOR H V RECTIFI...

Page 13: ... NEUTRAL RY4 RY3 RY2 RY6 RY5 CM CONVECTION MOTOR THERMISTOR RY1 CAPACITOR 0 94µF AC2200V GRILL HEATER TOP BOTTOM HEATER MAGNETRON POWER TRANSFORMER B2 B1 A3 A5 D1 D3 SECONDARY INTERLOCK SWITCH THERMAL CUT OUT OVEN THERMAL CUT OUT MAG MONITOR SWITCH FUSE 20A 120V 60Hz OL FM TTM OVEN LAMP FAN MOTOR TURNTABLE MOTOR H V RECTIFIER CONTROL UNIT RPIMARY INTERLOCK RELAY COM COM COM N O COM N O N O N O A1 ...

Page 14: ...vent damage to the oven if the food in the oven catch fire due to over heating produced by improper settingofthecookingtimeorfailureofcontrolunit Underthe normal operation the oven thermal cut out remains closed However when abnormally high temperatures are reached within the oven cavity the oven thermal cut out will open at 338 F 170 C causing the oven to shut down The thermal cut out will close ...

Page 15: ...econnect the power supply cord after the outer case is installed 7 Run the oven and check all functions BOTTOM HEATER The bottom heater is located on the floor of the oven cavity assembly The bottom heater sends out heat to grill foods CONVECTION COOKING SYSTEM This oven is designed with a hot air heating system where food is not directly heated by the top heaters and the bottom heater but is heat...

Page 16: ...ugged into wall outlet Display does not operate properly when STOP CLEAR pad is pressed Oven does not start when the START pad is pressed Display operates Oven lamp does not light Turntable motor operates Fan motor does not operate Oven lamp lights Turntable motor does not operate Oven lamp lights Oven or electrical parts does not stop when cooking time is 0 or STOP CLEAR pad is pressed Oven goes ...

Page 17: ...E COOK CYCLE SO EXTREME CAUTION SHOULD BE OBSERVED Power output of the magnetron can be measured by performing a water temperature rise test This test shouldonlybeusedifabovetestsdonotindicateafaultymagnetronandthereisnodefectinthefollowing componentsorwiring siliconrectifier highvoltagecapacitorandpowertransformer Thistestwillrequire a 16 ounce 453cc measuring cup and an accurate mercury thermome...

Page 18: ...through the vent holes of the oven cavity especially the cooling fan and air guide 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 THERMAL CUT OUT TEST 125 C MAGNETRON 1 Disconnect the power supply cord and then remove outer case 2 Open the door...

Page 19: ...g 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 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 Isolatetheswitchandconnecttheohmmetertothecommon COM andnormallyo...

Page 20: ... operation is indicated the switch may be defective After testing the monitor switch reconnect the wire lead to the monitor switch COM terminal and check the continuity of the monitor circuit 5 Reconnectallleadsremovedfromcomponents 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 SCREW DRIV...

Page 21: ...f the thermistor with an ohmmeter Connect the ohmmeter leads to Pin No s D1 and D3 Room Temperature Resistance 68 F 20 C 86 F 30 C Approx 293kΩ 184KΩ 5 If the meter does not indicate above resistance replace the thermistor 6 Reconnect all leads removed from components during testing 7 Reinstall the outer case cabinet 8 Reconnect the power supply cord after the outer case is installed 9 Run the ove...

Page 22: ... case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Replace the key unit 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 8 Run the oven and check all functions 2 Control Unit The following symptoms indicate a defective control unit Before replacing the contr...

Page 23: ...ing insulation tape 6 After that procedure re connect the power supply cord 7 Remove the outer case and check voltage between Pin No 1 of the 3 pin connector A and the common terminal of the relay RY6 on the control unit with an A C voltmeter The meter should indicate 120 volts if not check oven circuit Shut off Cook and Heater Relay Test These relays are operated by D C voltage Check voltage at t...

Page 24: ...RRENCE CAUSE OR CORRECTION 1 Only pattern at a is broken Insert jumper wire J1 and solder 2 Pattern at a and b are broken Insert the coil RCILF2003YAZZ between c and d 5 Make a visual inspection of the varistor Check for burned damage and examine the transformer with a tester for the presence of layer short circuit check the primary coil resistance which is approximately 218Ω 10 If any abnormal co...

Page 25: ...d AC voltage is present at primary Low voltage transformer or secondary circuit defective side of low voltage transformer Check and repair 8 Disconnect the power supply cord and then remove outer case 9 Open the door and block it open 10 Discharge high voltage capacitor 11 Reconnect all leads removed from components during testing 12 Re install the outer case cabinet 13 Reconnect the power supply ...

Page 26: ...nits The touch control section consists of the following units as shown in the touch control panel circuit 1 Key Unit 2 Control Unit The Control unit consists of Power unit and CPU unit The principal functions of these units and signals communi cated among them are explained below Key Unit The key unit is composed of a matrix signals generated in theLSIaresenttothekeyunitfromP40 P41 P72 P73P74 P75...

Page 27: ...ty reaches the preset temperature in the preheating mode or when the preheating hold time 30 minutes is elapsed 13 P55 OUT Timing signal output terminal for temperature measurement OVEN THERMIS TOR H level GND Thermistor OPEN timing L level 5V Temperature measuring timing Convection cooking 14 18 P54 P50 IN OUT Terminal not used 19 P47 IN Signal coming from touch key When any one of G12 line keys ...

Page 28: ...ine key on matrix is touched 31 P73 OUT Key strobe signal Signal applied to touch key section A pulse signal is input to P44 P47 terminal while one of G2 line key on matrix is touched 32 P72 OUT Key strobe signal Signal applied to touch key section A pulse signal is input to P44 P47 terminal while one of G1 line key on matrix is touched 33 P71 OUT Oven lamp and turntable motor driving signal Squar...

Page 29: ... for 5 minutes after grill cooking or for a while after convection or roust cooking H level otherwise 44 P24 OUT Terminal not used 45 P23 OUT Common data signal COM5 Connected to LCD Pin No 37 46 48 P22 P20 OUT Segment data signal Connected to LCD No connection in LCD 49 50 P17 P16 OUT Segment data signal Connecte 0d to LCD No connection in LCD 51 80 SEG39 SEG10 OUT Segment data signal Connected t...

Page 30: ...ed to GND 92 VREF IN Connected to GND 93 AVSS IN Connected to VC 94 COM3 OUT Common data signal COM4 Connected to LCD Pin No 36 95 COM2 OUT Common data signal COM3 Connected to LCD Pin No 35 96 COM1 OUT Common data signal COM2 Connected to LCD Pin No 34 97 COM0 OUT Common data signal COM1 Connected to LCD Pin No 33 98 99 VL3 VL2 IN Power source voltage input terminal Standard voltage for LCD 100 C...

Page 31: ...he 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 For those models therefore it is possible to c...

Page 32: ...tage transformer grill heater bottom heater and Oven cavity WARNING FOR WIRING 1 Disconnect the power supply cord 2 Make sure that a definite click can be heard when the microwave oven door is unlatched Hold the door in a closed position with one hand then push the door open button with the other this causes the latch leads to rise it is then possible to hear a click as the door switches operate 3...

Page 33: ...fier assembly 7 Now the high voltage rectifier assembly should be free 8 Remove one 1 screw holding capacitor holder to the oven cavity rear plate 9 Release the capacitor holder from the fan duct 10 Remove the capacitor from the capacitor holder 11 Now the capacitor should be free CAUTION WHEN REPLACING HIGH VOLTAGE RECTI FIER AND HIGH VOLTAGE CAPACITOR GROUND SIDE TERMINAL OF THE HIGH VOLTAGE REC...

Page 34: ... motor is free 6 After replacement use the one 1 screw provided with the turntable motor assembly to fit turntable motor cover NOTE The one 1 screw to fit the turntable motor cover should be XFPSD40P12K00 XFPSD40P10K00 or XFPSD40P08K000 4 Disconnectthemainwireharness thermistorharnessand the switch harness from the power unit 5 Straighten the tab of the oven cavity front flange holding the tab of ...

Page 35: ...er mallet CAUTION Donothitthefanbladehardwheninstallingbecause 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 5 Install the fan duct to the oven cavity rear plate with the one 1 screw 6 Insert the tabs of the capacitor holder to the fan duct 7 Install the capacitor holder to the oven cavity rear plate...

Page 36: ...ower Supply Cord Moulding Cord Stopper Oven Cavity Rear Plate Square Hole cavity rear plate with one 1 screw and tighten the screw 3 Connect the brown and blue wire leads of power supply cord to the main wire harness correctly referring to the Pictorial Diagram 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 Remov...

Page 37: ...lunger of the monitor switch is pressed with the door closed 6 Secure the screws with washers firmly 7 Check the operation of all switches If each switch has not activated with the door closed loosen screw and adjust the latch hook position After adjustment check the following 1 In and out play of door remains less than 0 5mm when in the latched position First check upper position of latch hook pu...

Page 38: ...he door frame Re install latch head to door frame 4 Re install door panel to door frame by fitting seven 7 tabs of door frame to seven 7 holes of door panel 5 Hold the door panel to the door frame with four 4 screws 6 Catch two 2 pins of door panel on two 2 hole of upper and lower oven hinges 7 Re install choke cover to door panel by pushing Note After any service to the door A Make sure that door...

Page 39: ......

Page 40: ...VEN THERMISTOR N C MICRO OVEN LAMP TURNTABLE MOTOR BOTTOM HEATER TOP HEATER DOOR SWITCH FAN MOTOR CONVECTION MOTOR Q2 2SB1238 R4 27 R5 4 7k R3 510 1 2w R2 510 1 2w RY5 RY6 RY4 Q3 DTD143ES C5 10µ 35v RY3 RY2 R6 3 3k SP1 D5 D1 D1 4 11ES1 T1 D2 D4 c d a b D3 4 6 1 8 VRS1 J1 C1 0 1µ 50v C3 0 1µ 50v D12 D11 RY1 D7 D10 D9 D8 C4 10µ 35v C2 470µ 50v 10G471K D6 A 1 B 2 B 1 D 3 D 1 C12 C13 C17 C 7 C11 C 8 C...

Page 41: ...24 SEG23 SEG22 SEG21 SEG20 SEG19 SEG18 SEG17 SEG16 SEG15 SEG14 SEG13 SEG12 SEG11 SEG10 SEG9 SEG8 SEG7 SEG6 SEG5 SEG4 SEG3 SEG2 SEG1 COM3 COM2 COM1 P81 P80 XIN XOUT VSS P27 P26 P25 P24 P23 P22 P21 P20 P17 P16 RESET INT1 INT0 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 SEG17 SEG18 SEG19 SEG20 SEG21 SEG22 SEG23 SEG24 SEG25 SEG26 SEG27 SEG28 SEG29 SEG30 SEG31 SEG32 SEG33 SEG34 SEG35 SEG36 SEG37 SEG38 SEG39 C1...

Page 42: ...ure S 4 Printed Wiring Board of Power Unit DIP D8 3 2 3 1 2 1 1 1 5 18 4 D6 R4 CN C CN D CN B CN A D5 R5 AC AC VRS1 6 FAN CON RY1 RY5 LOT NO F RY6 RY3 T H RY4 B H RY2 J1 T1 D12 D4 S 6 8 1 4 P D2 D7 5 MICRO SP1 R6 R3 C4 C3 C5 C2 B B B E E 1 E Q3 R2 R1 D1 D3 D11 C1 ZD1 Q2 Q1 D9 D10 ...

Page 43: ...et R 820BK 1 BB 2 2 GCABUA649WRP0 Outer case cabinet R 820BW 1 AZ 2 3 GDAI A305WRW0 Base plate 1 AX 2 4 GLEGPA074WRE0 Leg 1 AC CONTROL PANEL PARTS 3 1 CPWBFA791WRK0 Power unit 1 BF 3 1A QCNCMA234DRE0 3 pin connector CN A 1 AC 3 1B QCNCMA275DRE0 2 pin connector CN B 1 AB 3 1C FW VZA238DRE0 9pin wire harness WH 1 WH 2 2 AK 3 1D QCNCMA410DRE0 2 pin connector CN D 1 AB C1 RC KZA087DRE0 Capacitor 0 1 u...

Page 44: ... 28 PPACGA041WRE0 Cushion 1 AE 4 29 PREFHA061WRW0 Reflector 1 BE 4 30 PSHEPA487WRE0 Heater film 1 AA 4 31 PSKR A331WRP0 Air separate angle 1 AY 4 32 MSPRCA113WRE0 H spring 2 AC 4 33 PCUSGA420WRP0 Cushion 1 AE 4 34 NFANMA047WRP0 Convection fan 1 AX 4 35 NFANMA048WRP0 Cooling fan 1 AX 4 36 PCUSUA499WRP0 Cushion 1 AC 4 37 PDUC A707WRW0 Convection duct 1 AR 4 38 PFPF A210WRE0 Thermal insulation 1 AM 4...

Page 45: ...W40P08000 Screw 4mm x 8mm 8 AB 7 7 XHPSD30P06000 Screw 3mm x 6mm 1 AA 7 8 XHTSD40P08RV0 Screw 4mm x 8mm 2 AA 7 9 XOTSD40P12RV0 Screw 4mm x 12mm 12 AA 7 10 XOTSD40P12000 Screw 4mm x 12mm 10 AA 7 11 XOTSD40R12RV0 Line head screw 4mm x 12mm 2 AA 7 12 XOTSF40P08000 Screw 4mm x 8mm R 820BK 1 AA 7 12 XOTSE40P08000 Screw 4mm x 8mm R 820BW 1 AA 7 13 XBTSD40P05000 Screw 4mm x 5mm 2 AA 7 14 XNEUW40 32000 Nu...

Page 46: ... 39 7 13 4 36 4 41 7 13 7 10 7 10 7 2 1 6 4 11 6 12 4 10 7 1 2 4 2 4 1 19 7 1 4 9 7 9 7 9 7 1 7 9 2 3 1 5 1 13 6 13 1 4 6 4 6 3 1 1 1 7 1 1 4 17 4 28 1 18 4 12 4 13 4 19 4 18 4 32 4 16 7 4 7 9 7 1 4 6 7 1 6 7 4 2 1 2 7 3 7 10 4 24 4 21 4 14 7 14 7 18 1 17 7 8 7 6 x3 7 16 4 34 4 40 7 10 6 5 7 10 7 7 4 40 4 37 4 35 4 42 4 38 4 43 7 17 4 31 7 10 4 15 7 1 1 9 1 8 1 12 1 16 1 15 1 14 4 22 7 1 7 1 4 7 1...

Page 47: ... 3 A B C D E F G H A B C D E F G H CONTROL PANEL PARTS DOOR PARTS 5 8 5 3 5 6 5 4 5 5 5 1 5 9 3 6 3 2 5 7 5 2 6 1 6 8 6 10 6 7 6 9 3 3 1 3 3 3 3 3 2 3 3 3 4 3 5 3 1 3 7 3 7 Actual wire harness may be different from illustration MISCELLANEOUS ...

Page 48: ...98 BY SHARP CORPORATION ALL RIGHTS RESERVED No part of this publication may be repro duced stored in retrieval systems or trans mitted in any form or by any means elec tronic mechanical photocopying record ing or otherwise without prior written per mission of the publisher ...

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