Sharp R-9H58 Скачать руководство пользователя страница 34

Страница: 34 / 44

R-9H58

NOTE: indicates components with potential above 250V.

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. CLOCK APPERARS ON DISPLAY

Figure O-1. Oven Schematic-OFF Condition

Figure O-2. Oven Schematic-High or Easy Defrost or Reheat Sensor Cooking Condition

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2.VARIABLE COOKING CONTROL “HIGH”

3. COOKING TIME PROGRAMMED.

4. START PAD TOUCHED.

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. “EASY DEFROST” PAD TOUCHED.

3. WEIGHT ENTERED.

4. START PAD TOUCHED.

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. “REHEAT SENSOR” PAD

TOUCHED.

3. START PAD TOUCHED.

THERMAL

CUT-OUT

150˚C (OVEN)

MONITOR RESISTOR

0.8/20W

MONITOR SWITCH

OVEN LAMP

FAN MOTOR

A-7

RY2

DAMPER MOTOR

CONVECTION MOTOR

TTM

TURNTABLE MOTOR

CONVECTION HEATER

MAGNETRON

POWER

TRANSFORMER

H.V. RECTIFIER

CAPACITOR

1.13

AC 2100V

ASYMMETRIC

RECTIFIER

THERMAL

CUT-OUT

95˚C (FM)

RY6

RY1

RY5

RY4

TEMP.

FUSE

150˚C

FUSE

M8A

230 - 240 V ~ 50Hz

LIVE

BLU

EARTH

BRN

NEUTRAL

G-Y

LINE CROSS CAPACCCITOR

0.22

/AC250V

NOISE

FILTER

LINE BYPASS CAPACITOR

0.0022

/AC250V

RESISTOR 680K/0.5W

RESISTOR 10M/0.5W

NOISE SUPPRESSION COIL

LINE BYPASS CAPACITOR

0.0022

/AC250V

COM

A-5

A-3

A-1

N.O.

LOWER

LATCH

SWITCH

N.O.

COM

RY3

A-9

E-1

E-2

E-3

E-4

E-5

E-6

F-1

F-2

F-3

CONTROL UNIT

DAMPER

SWITCH

THER-

MISTOR

STOP

SWITCH

AH SENSOR

COM.

UPPER

LATCH

SWITCH

N.O.

TEMP.

FUSE

150˚C

FUSE

M8A

230 - 240 V ~ 50Hz

LIVE

BLU

EARTH

BRN

NEUTRAL

G-Y

NOISE

FILTER

LINE BYPASS CAPACITOR

0.0022

/AC250V

RESISTOR 680K/0.5W

RESISTOR 10M/0.5W

NOISE SUPPRESSION COIL

LINE BYPASS CAPACITOR

0.0022

/AC250V

THERMAL

CUT-OUT

150˚C (OVEN)

MONITOR RESISTOR

0.8/20W

MONITOR SWITCH

OVEN LAMP

FAN MOTOR

A-7

A-1

RY2

RY3

DAMPER MOTOR

CONVECTION MOTOR

TTM

TURNTABLE MOTOR

CONVECTION HEATER

MAGNETRON

POWER

TRANSFORMER

H.V. RECTIFIER

CAPACITOR

1.13

AC 2100V

ASYMMETRIC

RECTIFIER

THERMAL

CUT-OUT

95˚C (FM)

RY6

RY1

RY5

RY4

LINE BYPASS CAPACITOR

0.22

/AC250V

COM

A-5

A-3

A-1

N.O.

LOWER

LATCH

SWITCH

N.O.

COM

RY3

A-9

E-1

E-2

E-3

E-4

E-5

E-6

F-1

F-2

F-3

CONTROL UNIT

DAMPER

SWITCH

THER-

MISTOR

STOP

SWITCH

AH SENSOR

COM.

UPPER

LATCH

SWITCH

N.O.

Содержание R-9H58

Страница 1: ...OUCH CONTROL PANEL 20 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 26 MICROWAVE MEASUREMENT 31 WIRING DIAGRAM 32 PICTORIAL DIAGRAM 34 CONTROL PANEL CIRCUIT 35 PRINTED WIRING BOARD 36 PARTS LIST 37 S8606R9H58PJ CONVECTION MICROWAVE OVEN MODEL R 9H58 In interests of user safety the oven should be restored to its original condition and only parts identical to those specified should be used SERVICE ...

Страница 2: ...R 9H58 ...

Страница 3: ...rbing load attached Never look into an open waveguide or an tenna while the device is energized WARNING Never operate the oven until the following points are ensured A The door is tightly closed B The door brackets and hinges are not defective C The door packing is not damaged D The door is not deformed or warped E There is not any other visible damage with the oven Servicing and repair work must ...

Страница 4: ...prox 70 of Full Power MED approx 50 of Full Power MED LOW DEFROST approx 30 of Full Power LOW approx 10 of Full Power Convection Temperature for Variable Cooking CONVECTION 40 to 250 C Temp control LOW MIX BAKE 180 C with 10 of microwave power HIGH MIX ROAST 200 C with 30 of microwave power GRILL 250 C Preheat HELP pad SENSOR INSTANT ACTION pads MULTI COOK pad REHEAT SENSOR pad CONVECTION COOKING ...

Страница 5: ...DS Press to cook for each func tion POWER LEVEL PAD Press to select microwave power setting If not pressed HIGH is au tomatically selected NUMBER AND TEMPERATURE PADS Press to enter cooking times clock time convection temperature or to select the Multi Cook menus STOP CLEAR PAD Press to clear during program ming Press once to stop operation of oven during cooking press twice to cancel cooking pro ...

Страница 6: ...oven will revert to the OFF condition 6 When the door is opened during a cook cycle the monitor switch upper latch switch lower latch switch and stop switch are activated with the following results The circuits to the turntable motor cooling fan motor and high voltage components are de energized the oven lamp remains on and the digital read out displays the time still remaining in the cook cycle w...

Страница 7: ...OKING CONDITION Choose the LOW MIX or HIGH MIX by pressing the LOW MIX pad or HIGH MIX pad And then enter cooking time by pressing the NUMBER pads When the START pad is touched the following operations occur 1 The numbers of the digital read out start the count down to zero 2 The shut off relay RY1 RY5 RY6 energized turning on the oven lamp turntable motor cooling fan motor and convection motor 3 ...

Страница 8: ...nd convection motor The power supply voltage is added to the convection heater 4 Now the oven is in the convection cooking mode 5 When the oven temperature has reached the programmed convection temperature the oven goes into the programmed cooking mode 6 At the end of the MULTI COOK cycle the damper is returned to the open position and the oven will go to the off condition The cooling fan will rem...

Страница 9: ...24 30 64 sec 3 sec Sensing the voltage across the temperature measurement circuit 6 sec 3 32 sec FUNCTION OF IMPORTANT COMPONENTS lower latch switch fail to open the fuse blows simultaneously with closing of the monitor switch contacts CAUTION BEFORE REPLACING A BLOWN FUSE TEST THE UPPER LATCH SWITCH LOWER LATCH SWITCH AND MONITOR SWITCH FOR PROPER OPERATION REFER TO CHAPTER TEST PROCEDURE STOP SW...

Страница 10: ...mp turntable motor cooling fan motor and convection motor are de energized At the end of the convection cycle if the cavity air temperature is above 116 C the circuit to RY6 will be maintained by the thermistor circuit to continue operation of the cooling fan motor until the temperature drops below 116 C at which time the relay will be de energized turning off the fan motor Relay RY5 will how ever...

Страница 11: ...en position 3 When oven is convection cooking 3 1 Dampermotorisenergizedbytouchingtheconvection temperature and START pads 3 2 When damper is in the closed position damper switch is OFF its signal is sensed by the control unit and shut off relay RY4 is de energized 3 3 The damper is held in the closed position during the convection cooking operation 3 4 At the end of the convection cooking shut of...

Страница 12: ...1 Disconnect the supply 2 Door opened and wedged open 3 Discharge high voltage capacitor WARNING AGAINST THE CHARGE OF THE HIGH VOLTAGE CAPACITOR The high voltage capacitor remains charged about 60 seconds after the oven has been switched off Wait for 60 seconds and then short circuit the connection of the high voltage capacitor that is of the connecting lead of the high voltage rectifier against ...

Страница 13: ... does not heat Temperatureintheovencav ity is lower or higher than preset Convection cycle runs 1 minute then the oven shuts down Convectioncycleruns3min utes then the oven shuts down Oven is in the sensor cook ing condition but AH sensor does not end 1st stage or does not stop cooking cycle or the oven stops soon MAGNETRON POWER TRANSFORMER H V RECTIFIER ASSEMBLY HIGH VOLTAGE CAPACITOR LATCH AND ...

Страница 14: ... water load is as follows Room temperature around 20 C Power supply Voltage Rated voltage Water load 1000 g Initial temperature 10 2 C Heating time 49 sec P 85 x T Measuring condition 1 Container The water container must be a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190 mm 2 Temperature of the oven and vessel The ove...

Страница 15: ...ing less than 1Ω If the reading obtained are not stated as above then the power transformer is probably faulty and should be replaced CARRY OUT 4R CHECKS HIGH VOLTAGE RECTIFIER TEST CARRY OUT 3D CHECKS Isolate the high voltage rectifier assembly from the HV circuit The high voltage rectifier can be tested using an ohmmeter set to its highest range Connect the ohmmeter across the terminal B C of th...

Страница 16: ...he defective parts or repair the wire harness 2 If the fuse M8A is blown when the door is opened check the upper latch switch lower latch switch monitor switch and monitor resistor If the fuse M8A is blown by incorrect door switching replace the defective switch s and the fuse M8A 3 If the fuse M8A is blown there could be short in the asymmetric rectifier or there is a ground in wire harness A sho...

Страница 17: ...tes that the convection motor has over heated this may be due to convection motor locked An open circuit thermal cut out 95 C FM indicates that the fan motor winding has overheated this may be due to blocked ventilation or locked cooling fan CARRY OUT 3D CHECKS Before carring out the following tests make sure the heater is fully cool 1 Resistance of heater Disconnect the wire leads to the heater t...

Страница 18: ...times a pad produces no signal 2 Control Unit The following symptoms indicate a defective control unit Replacethe control unit 2 1 In connection with pads a When touching the pads a certain group of pads do not produce a signal b When touching the pads no pads produce a signal 2 2 In connection with indicators a At a certain digit all or some segments do not light up b At a certain digit brightnes...

Страница 19: ... 5 pin connector A and the commonterminaloftherelayRY1onthecontrolunitwithanA C voltmeter Themetershouldindicate 230 240 volts if not check oven circuit Shut off Cook and Heater 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 or convection cooking operation DC voltage indicated Defective relay DC voltag...

Страница 20: ... any moisture with a dry cloth or paper towel 6 The Sensor works with food at normal storage temperature For example chicken pieces would be at refrigerator temperature and canned soup at room temperature 7 Avoid using aerosol sprays or cleaning solvents near the oven while using Sensor settings The sensor will detect the vapor given of by the spray and turn off before food is properly cooked 8 Af...

Страница 21: ...with the control unit CHECKING CONTROL UNIT 1 Disconnect oven from power supply and remove outer case 2 Discharge the high voltage capacitor 3 Disconnect the wire leads from the cook relay 4 Disconnect the sensor connector that is mounted to lower portion of control panel 5 Then connect the dummy resistor circuit see fig to the sensor connector of control panel 6 Reconnect the oven to the power su...

Страница 22: ...a basic standard time in the clock circuit It incorporates a very small error because it works on commercial frequency 4 ACL Circuit A circuit to generate a signals which resetting the LSI to the initial state when power is applied 5 Buzzer Circuit The buzzer is responds to signals from the LSI to emit noticing sounds key touch sound and completion sound 6 Temperature Measurement Circuit OVEN THER...

Страница 23: ...gnal which communicates the door open close information to LSI Door closed H level signal 0V Door opened L level signal 5V 11 AN1 IN Input signal which communicates the damper open close information to LSI Damper opened H level signal 0V GND Damper closed L level signal 5V 12 AN0 IN Temperature measurement input OVEN THERMISTOR By inputting DC voltage corresponding to the temperature detected by t...

Страница 24: ...d buzzer A key touch sound B Completion sound C When the temperature of the oven cavity reaches the preset tempera ture in the preheating mode or when the preheating hold time 30 min utes is elapsed 24 P42 OUT Timing signal output terminal for temperature measurement OVEN H level GND Ttermistor OPEN timing L level 5V Temperature measuring timing Convection cooking 25 INT1 IN Signal to synchronize ...

Страница 25: ...23 Key strobe signal Signal applied to touch key section A pulse signal is input to P24 P27 terminal while one of G 10 line keys on key matrix is touched 44 P14 OUT Segment data signal Signal similar to P23 Key strobe signal Signal applied to touch key section A pulse signal is input to P24 P27 terminal while one of G 9 line keys on key matrix is touched 45 P13 OUT Segment data signal Signal simil...

Страница 26: ...his 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 16 seconds clearing cycle occurs than the detector circuit starts to function and the LSI observes the initial voltage available at its AN6 terminal With this voltage given the switches SW1 to SW5 in the LS...

Страница 27: ...nected 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 touch c...

Страница 28: ...om the basis of the 3D checks CAUTION DISCHARGE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPO NENTS OR WIRING REMOVAL 1 CARRY OUT 3D CHECKS 2 Disconnect the wire leads from power transformer 3 Disconnect the filament leads of the power transformer from the megnetron and high voltage capacitor 4 Disconnectthehighvoltageleadsofcapacitorfrom the transformer 5 Remove the two 2 screws and one 1...

Страница 29: ...now free HEATER UNIT ASSEMBLY REMOVAL HEATING ELEMENT THERMISTOR HEATING ELEMENT AND THERMISTOR 1 Remove two 2 screws holding heating element to heater duct 2 Loosen two 2 screws holding holders to heater duct andtakeheatingelementoutofheatingelementholders 3 Heating element is free 4 Remove two 2 screws holding thermistor to heater duct 5 Thermistor is free To remove the control panel proceed as ...

Страница 30: ...otatingthefan blade with your hand 3 Now the fan blade will be free CAUTION Do not use this removed fan blade again Because the hole for shaft of it may become bigger than a standard one FAN MOTOR REPLACEMENT 7 Remove the two 2 screws and nuts holding the fan motor and thermal cut out mounting angle from the fun duct 8 Now the fan motor is free INSTALLATION 1 Install the fan motor and thermal cut ...

Страница 31: ...ll be free do not lose it STOP SWITCH UPPER LATCH SWITCH LOWER LATCH SWITCH AND MONITOR SWITCH REMOVAL Re install 1 Re install latch lever and each switch in its place refer to Figure C 1 2 Re connect the wire leads to each switches and fuse holder Refer to the pictorial diagram 3 Secure the latch hook with two 2 mounting screws to the oven flange 4 Make sure that monitor switch is operating prope...

Страница 32: ... mounting screws Note After any service to the door A Make sure that the upper and lower latch switches are operating properly Refer to chapter Test Procedures B An approved microwave survey meter should be used to assure compliance with proper microwave radiation emission limitation standards DOOR ADJUSTMENT The door is adjusted by keeping the screws of each hinge loose The lower oven hinge can b...

Страница 33: ...dformicrowaveovensmustbeusedfortesting Recommended instruments are NARDA 8100 NARDA 8200 HOLADAY HI 1500 SIMPSON 380M 2 Place the oven tray into the oven cavity 3 Place the load of 275 15ml of water initially at 20 5 C in the centre of the oven tray The water container should be a low form of 600 ml beaker with inside diameter of approx 8 5cm and made of an electrically non conductive material suc...

Страница 34: ... BLU EARTH BRN NEUTRAL G Y LINE CROSS CAPACCCITOR 0 22µ AC250V NOISE FILTER LINE BYPASS CAPACITOR 0 0022µ AC250V RESISTOR 680K 0 5W RESISTOR 10M 0 5W NOISE SUPPRESSION COIL LINE BYPASS CAPACITOR 0 0022µ AC250V L N COM A 5 A 3 A 1 N O LOWER LATCH SWITCH N O COM RY3 A 9 E 1 E 2 E 3 E 4 E 5 E 6 F 1 F 2 F 3 CONTROL UNIT DAMPER SWITCH THER MISTOR STOP SWITCH AH SENSOR COM UPPER LATCH SWITCH N O TEMP FU...

Страница 35: ...AMP DM FM FAN MOTOR A 7 A 1 RY2 CM DAMPER MOTOR CONVECTION MOTOR TTM TURNTABLE MOTOR CONVECTION HEATER MAGNETRON POWER TRANSFORMER H V RECTIFIER CAPACITOR 1 13µ AC 2100V ASYMMETRIC RECTIFIER OL THERMAL CUT OUT 95 C FM RY6 RY1 RY5 RY4 LINE BYPASS CAPACITOR 0 22µ AC250V TEMP FUSE 150 C FUSE M8A 230 240 V 50Hz LIVE BLU EARTH BRN NEUTRAL G Y NOISE FILTER LINE BYPASS CAPACITOR 0 0022µ AC250V RESISTOR 6...

Страница 36: ...N HEATER THERMISTOR HIGH VOLTAGE CAPACITOR POWER TRANSFORMER CONVECTION MOTOR GRN COM N O GRY WHT PRL WHT WHT RED WHT N O COM PNK PNK BRN GRY 1 2 RED RED 2 1 BRN COM N O ORG PNK LOWER LATCH SWITCH MONITOR SWITCH COM N C PPL ORG BLK AH SENSOR RED WHT 1 2 3 CN F 2 RY3 RY2 CN A FAN MOTOR THERMAL CUT OUT 95 C RED BLK RED GRY R E D WHT R E D R E D RY1 T1 1 6 5 4 2 3 1 3 5 7 9 N O N O N O COM COM COM RY...

Страница 37: ...EN THERMISTOR AH SENSOR OVEN LAMP TURNTABLE MOTOR RY6 RY2 D30 RY3 RY1 R31 4 7k R51 4 7k R62 75kF CF1 4 19MHz C70 330pF x 4 A B C C30 C50 C60 D3 D4 D7 Q1 2SB1238 Q4 DTA123ES Q3 KRA101M Q90 KRA101M Q40 KRA101M Q21 KRA101M Q22 KRA101M Q24 KRA101M Q25 KRA101M Q23 KRA101M Q26 KRC243M Q20 KRA101M R10 18 1w CONTROL UNIT C10 0 1µ 50v VP VP F F 8G 31 32 1 2 29 MIX CONV DEFROST SENSOR COOK KG HELP R90 100k ...

Страница 38: ... ZD3 ZD4 8 10 11 12 J7 J2 J4 J6 J5 J3 C10 C81 C80 C45 R47 C46 C47 R48 R49 CN D CN G CN G CN F CN E ONLY 9X58PJ C7 C9 C5 C6 C21 C4 C2 C22 C1 R3 C3 C60 C50 C30 R45 R91 R92 R93 R64 R80 R81 R73 D70 D71 D72 D73 D74 D75 D76 D77 R72 R71 R70 R79 R78 R77 R76 R75 R74 R86 J8 R90 R7 R100 R40 DAMP SW DOOR SW OVEN TEMP R50 R51 R31 R30 POWER TRANS POWER OL TTM R62 C20 26 CN A ZD2 R2 D3 D4 D1 D2 Q1 Q23 Q26 Q22 E ...

Страница 39: ... 2 5 PHOK A043WRF0 Latch hook 1 AM 2 6 GFTARA001WRW0 Oven lamp access cover 1 AC 2 7 GLEGPA019WRE0 Foot 4 AD 2 8 LBNDKA036WRP0 Capacitor holder 1 AG 2 9 LBSHC0032WRE0 Cord bushing 1 AB 2 10 LSTPPA141WRF0 Cord anchorage Upper 1 AD 2 11 LSTPP0009YBF0 Cord anchorage Lower 1 AC 2 12 MLEVPA122WRF0 Latch lever 1 AD CONTROL PANEL PARTS 3 1 CPWBFA706WRK0 Control unit New Zealand only 1 BT 3 1A QCNCMA227DR...

Страница 40: ...HEHZ4A2 1 Zener diode HZ4A2 1 AA 3 2 FPNLCB249WRK0 Control panel frame with key unit 1 BB 3 2 1 FUNTKA769WRE0 Key unit 1 BA 3 2 2 HPNLCA800WRF0 Panel grill 1 AL 3 3 JBTN A766WRF0 Open button 1 AG 3 4 MSPRCA050WRE0 Open button spring 1 AB 3 5 LANGTA197WRW0 Control panel back plate 1 AK 3 6 MLEVFA057WRW0 Open lever 1 AE 3 7 NSFTTA042WRE0 Open shaft 1 AE 3 8 XEPSD30P10XS0 Screw control unit mtg 3 AA ...

Страница 41: ... 5 TLABNA191WRR0 Menu label 1 AD 6 6 FW VZB534WRE0 Main wire harness 1 BC 6 7 QW QZA202WRE0 High voltage wire A 1 AK 6 8 TSPCNC359WRR0 Name plate 1 AF 6 9 FW VZB342WRE0 Thermistor harness 1 AN 6 10 TCAUHA214WRR0 Caution label 1 AF SCREWS NUTS AND WASHERS 7 1 XHTSD40P08RV0 Screw 4mm x 8mm 6 AA 7 2 LX BZ0202WRE0 Special screw 2 AB 7 3 LX CZA020WRE0 Special screw 6 AA 7 4 XCTWW40P08000 Screw 4mm x 8m...

Страница 42: ...L NUMBER 2 REF NO 3 PART NO 4 DESCRIPTION TURNTABLE TRAY INSTRUCTION BOOK AND COOK BOOK ROLLER STAY TRAY PACKING FOAM SPADPA198WRE0 DOOR PROTECTION SHEET SPADPA178WRE0 MICROWAVE OVEN PACKING PAD KIT CPADBA083WRK0 PLASTIC BAG SSAKHA012WRE0 TRAY HOLDER SPADFA348WRE0 Not replaceable items PACKING CASE SPAKCC803WRE0 PACKING AND ACCESSORIES ...

Страница 43: ...19 7 8 1 10 4 26 1 9 4 36 4 38 4 22 4 32 7 9 7 19 4 4 1 9 1 14 7 15 4 15 7 24 7 16 1 21 4 20 4 39 7 10 2 7 2 1 2 2 1 1 7 23 4 41 7 28 1 23 4 25 4 2 4 30 4 30 4 28 4 11 7 31 4 28 4 29 2 11 4 7 4 37 7 22 x3 6 9 1 15 2 1 x4 x4 1 11 7 23 7 22 x3 4 35 6 10 2 6 A x3 7 14 2 3 7 32 7 6 x4 4 31 6 5 2 12 2 5 1 8 2 4 7 29 7 13 x 3 7 27 7 27 7 27 x2 2 2 7 3 x3 x3 4 16 7 3 x3 x4 x2 x8 1 19 7 15 4 39 7 10 1 10 ...

Страница 44: ...in Australia CONTROL PANEL PARTS DOOR PARTS MISCELLANEOUS 5 1 5 10 7 17 5 5 5 3 7 25 5 2 7 2 5 7 5 8 5 9 5 6 7 18 7 19 x3 7 17 5 x3 5 4 x3 Actual wire harness may be different than illustration 6 9 6 7 6 2 6 1 6 6 3 2 3 1 3 8 3 5 3 9 3 6 3 7 7 10 6 8 3 3 3 4 7 10 7 10 3 2 1 x 3 x 4 3 2 2 3 1E 3 1F ...

Результаты поиска

Содержание R-9H58

Отзывы:

Похожие инструкции для R-9H58

Бренды по названию

Популярные бренды

Sharp R-9H58, Руководство по обслуживанию

Результаты поиска

Содержание R-9H58

Отзывы:

Похожие инструкции для R-9H58

Бренды по названию

Популярные бренды