HarmanKardon-AVR2700-avr-sm维修电路原理图.pdf

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1、Service Manual harman/kardonAVR 2700 Audio/Video Receiver CONTENTSESD WARNING.2 LEAKAGE TESTING.3 BASIC SPECIFICATIONS.4 FRONT PANEL CONTROLS.5 REAR PANEL CONNECTIONS.7 REMOTE CONTROL FUNCTIONS. 9 CONNECTIONS/INSTALLATION.14 OPERATION . . . . . .33BASIC TROUBLESHOOTING.41 PROCESSOR RESET.42 AMPLIFIE

2、R BIAS ADJUSTMENT.43 PACKAGING.44 DISASSEMBLY45UNIT EXPLODED VIEW.46 BLOCK DIAGRAM.47 PCB DRAWINGS.49 ELECTRICAL PARTS LIST.69 SEMICONDUCTOR PINOUTS138 SCHEMATICS.139WIRING DIAGRAM.158 harman/kardon Released 2012 8500 Balboa Blvd. Discontinued XXXX Northridge, CA. 91329 Rev0 12/2012 RadioFans.CN 收音机

3、爱 好者资料库Eachprecautioninthismanualshouldbefollowedduringservicing.Components identified with the IEC symbolin the parts list are special significance to safety. When replacing a component identified with, use only the replacement parts designated, or parts with the same ratings or resistance, wattage

4、, or voltage that are designated in theparts list in this manual. Leakage-current or resistance measurements must be made to determine that exposed parts are acceptablyinsulated from the supply circuit before retuming the product to the customer.Some semiconductor (solid state) devices can be damage

5、d easily by static electricity. Such components commonly are calledElectrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field effect transistors andsemiconductor chip components.The following techniques should be used to help reduce the incidence

6、of component damage caused by static electricity.1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge onyour body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist s

7、trap device,which should be removed for potential shock reasons prior to applying power to the unit under test.2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as aluminum foil, toprevent electrostatic charge build-up or exposure of t

8、he assembly.3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.4. Use only an anti-static solder removal device. Some solder removal devices not classified as anti-static can generate electrical chargessufficient to damage ES devices.5. Do not use freon-propelled chemicals. T

9、hese can generate electrical change sufficient to damage ES devices.6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacementES devices are packaged with leads electrically shorted together by conductive foam, aluminu

10、m foil or comparable conductive material.)7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to thechassis or circuit assembly into which the device will be installed.Be sure no power is applied to the chassis or circuit, a

11、nd observe all other safety precautions.8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the brushing togetheror your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an

12、 ES devices.CAUTION : AVR 2700 harman/kardon 2RadioFans.CN 收音机爱 好者资料库SAFETY PRECAUTIONSThe following check should be performed for the continuedprotection of the customer and service technician.LEAKAGE CURRENT CHECKMeasure leakage current to a known earth ground (waterpipe, conduit, etc.) by connect

13、ing a leakage current testerbetween the earth ground and all exposed metal parts of theappliance (input/output terminals, screwheads, metaloverlays, control shaft, etc.). Plug the AC line cord of theappliance directly into a 120V AC 60Hz outlet and turn theAC power switch on. Any current measured mu

14、st not exceedo.5mA.ANY MEASUREMENTS NOT WITHIN THE LIMITSOUTLINED ABOVE ARE INDICATIVE OF APOTENTIAL SHOCK HAZARD AND MUST BECORRECTED BEFORE RETURNING THE APPLIANCETO THE CUSTOMER.DeviceundertestTest allexposed metalsurfacesAlso test withplug reversed(Using AC adapterplug as required)AC Leakage Tes

15、tLeakagecurrenttesterReading shouldnot be above0.5mAEarthground AVR 2700 harman/kardon 3SpecificationsAudio SectionStereo power:AVR 3700/AVR 370: 125W per channel, two channels driven 6/8 ohms, 20Hz 20kHz, 0.07% THDAVR 2700/AVR 270: 105W per channel, two channels driven 6/8 ohms, 20Hz 20kHz, 0.07% T

16、HDMultichannel power:AVR 3700/AVR 370: 125W per channel, two channels driven 6/8 ohms, 20Hz 20kHz, 0.07% THDAVR 2700/AVR 270: 105W per channel, two channels driven 6/8 ohms, 20Hz 20kHz, 0.07% THDInput sensitivity/impedance:250mV/27k ohmsSignal-to-noise ratio (IHF-A):100dBSurround system adjacent cha

17、nnel separation:Dolby Pro Logic/DPLII: 40dB Dolby Digital: 55dB DTS: 55dBFrequency response ( 1W):10Hz 130kHz (+0dB/3dB)High instantaneous current capability (HCC): 42 amps (AVR 3700/AVR 370); 39 amps (AVR 2700/AVR 270)Transient intermodulation distortion (TIM):UnmeasurableSlew rate:40V/secFM Tuner

18、SectionFrequency range:87.5 108.0MHzUsable sensitivity IHF:1.3V/13.2dBfSignal-to-noise ratio (mono/stereo):70dB/68dBDistortion (mono/stereo):0.2%/0.3%Stereo separation:40dB 1kHzSelectivity (400kHz):70dBImage rejection:80dBIF rejection:80dBAM Tuner SectionFrequency range:520 1710kHz (AVR 3700/AVR 270

19、0) 522 1620kHz (AVR 370/AVR 270)Signal-to-noise ratio:38dBUsable sensitivity (loop):500VDistortion (1kHz, 50% mod):1.0%Selectivity (10kHz):30dBVideo SectionTelevision format:NTSC (AVR 3700/AVR 2700); PAL (AVR 370/AVR 270)Input level/impedance:1Vp-p/75 ohmsOutput level/impedance:1Vp-p/75 ohmsVideo fr

20、equency response (composite video):10Hz 8MHz (3dB)HDMI:Support up to 4k x 2kGeneral SpecificationsPower requirement:120V AC/60Hz (AVR 3700/AVR 2700); 220V 240V AC/50Hz 60Hz (AVR 370/AVR 270)Power consumption: ADDR000110110 x900 x920 x940 x96OPENOPENOPEN12.08.02MULTI. LABANAMISSUEPMP11.12.2712.08.021

21、1.12.27W.Y.YL.J.HS.K.SHDMI62012.05.292012.05.292012.05.29191817161514131211109876?4321JK1001Q1005T1P141CQ1006T1N241CR101522KR10141KC10030.1uF / 16VR101347KR10181005 / 1/16W / 0ohmR101747KR10164.7K191817161514131211109876?4321JK1002Q1003T1P141CQ1004T1N241CR100922KR10081KC10020.1uF / 16VR100747KR10121

22、005 / 1/16W / 0ohmR101147KR10104.7K191817161514131211109876?4321JK1003Q1001T1P141CQ1002T1N241CR100322KR10021KC10010.1uF / 16VR100147KR10061005 / 1/16W / 0ohmR100547KR10044.7KC101310uF/6.3VC10140.1uF / 16VC10170.1uF / 16VL10019R005ZC10150.1uF / 16VC10160.1uF / 16V? ? ?32313029282726252423222120191817

23、161514131211109876?4321IC1001ADV3002C10180.1uF / 16VC10190.1uF / 16VC102050V/1000PFQ1009CVTRT1N441CNCR10404.7Kohm_NCR10361005 / 1/16W / 0ohmR10371005 / 1/16W / 0ohmR102910KohmR102810KohmR102710KohmR10262.2KohmR10252.2KohmR10354.7KohmR10334.7KohmR10344.7KohmR10414.7KohmR10424.7KohmR10434.7Kohm_NCR104

24、44.7Kohm_NCR10301005 / 1/16W / 0ohmR10311005 / 1/16W / 0ohmR10391005 / 1/16W / 0ohmR10381005 / 1/16W / 0ohmD1004D1003D1002D1001D1016D1015D1014D1013D1028D1027D1026D1025D1037CVDRB521S-30TP19TP22TP25TP43TP46R10451005 / 1/16W / 0ohmR104610KohmR106110KohmR106210KohmR106310KohmCECHDMI_1_RX_HPDHDMI_1_RX_PW

25、RHDMI_1_RX_DDC_SCLHDMI_1_RX_DDC_SDAHDMI_1_RX_D2-HDMI_1_RX_D2+HDMI_1_RX_D1-HDMI_1_RX_D1+HDMI_1_RX_D0-HDMI_1_RX_D0+HDMI_1_RX_CK-HDMI_1_RX_CK+CECHDMI_2_RX_HPDHDMI_2_RX_PWRHDMI_2_RX_DDC_SCLHDMI_2_RX_DDC_SDAHDMI_2_RX_D2-HDMI_2_RX_D2+HDMI_2_RX_D1-HDMI_2_RX_D1+HDMI_2_RX_D0-HDMI_2_RX_D0+HDMI_2_RX_CK-HDMI_2_

26、RX_CK+CECHDMI_3_RX_HPDHDMI_3_RX_PWRHDMI_3_RX_DDC_SCLHDMI_3_RX_DDC_SDAHDMI_3_RX_D2-HDMI_3_RX_D2+HDMI_3_RX_D1-HDMI_3_RX_D1+HDMI_3_RX_D0-HDMI_3_RX_D0+HDMI_3_RX_CK-HDMI_3_RX_CK+AVDD_3V3_3002_M2+3.3V_MUXAVDD_3V3_3002_M2HDMI_RX_RSTAVDD_3V3_3002_M2HDMI_MUX2_TX_D2+HDMI_MUX2_TX_D2-HDMI_MUX2_TX_D1+HDMI_MUX2_T

27、X_D1-HDMI_MUX2_TX_D0+HDMI_MUX2_TX_D0-HDMI_MUX2_TX_CK+HDMI_MUX2_TX_CK-HDMI_SCLHDMI_SDAAVDD_3V3_3002_M2HDMI_1_RX_PWRHDMI_2_RX_PWRHDMI_3_RX_PWRHDMI_1_RX_HPDHDMI_3_RX_HPDHDMI_1_RX_D2-HDMI_1_RX_D2+HDMI_1_RX_D1-HDMI_1_RX_D1+HDMI_1_RX_D0-HDMI_1_RX_D0+HDMI_1_RX_CK-HDMI_1_RX_CK+HDMI_3_RX_D2-HDMI_3_RX_D2+HDMI

28、_3_RX_D1-HDMI_3_RX_D1+HDMI_3_RX_D0-HDMI_3_RX_D0+HDMI_3_RX_CK-HDMI_3_RX_CK+HDMI_1_RX_DDC_SCLHDMI_1_RX_DDC_SDAHDMI_2_RX_DDC_SCLHDMI_2_RX_DDC_SDAHDMI_3_RX_DDC_SCLHDMI_3_RX_DDC_SDAHDMI_MUX2_TX_DDC_SCLHDMI_MUX2_TX_DDC_SDAAVDD_3V3_3002_M2+5VH1HDMI_2_RX_HPDHDMI_2_RX_D2-HDMI_2_RX_D2+HDMI_2_RX_D1-HDMI_2_RX_D

29、1+HDMI_2_RX_D0-HDMI_2_RX_D0+HDMI_2_RX_CK-HDMI_2_RX_CK+ADV3002_RESETADV3002_HPDADV3002_HPDADV3002_HPD AVR 2700 harman/kardon 14312.08.02(HDMI INPUT 3:1 MUX)11.12.2711.12.2792L.J.HS.K.S7654321REVISIONSCHEMATIC DIAGRAMSHEETMODELDRAWING NODESIGNCHECKAPPROVEADC6ABCD54321BW.Y.YARV270/370CUPxxxxxZCUP12457Z

30、D2+D2 SHIELDD2-D1+D2 SHIELDD1-D1 SHIELDD0+D0-CK+D1 SHIELDCK-CE REMOTENCDDC CLKDDC DATAGND+5VHP DET#21: HPD PartHDMI INPUT 1D2+D2 SHIELDD2-D1+D2 SHIELDD1-D1 SHIELDD0+D0-CK+D1 SHIELDCK-CE REMOTENCDDC CLKDDC DATAGND+5VHP DET#21: HPD PartHDMI INPUT 2D2+D2 SHIELDD2-D1+D2 SHIELDD1-D1 SHIELDD0+D0-CK+D1 SHI

31、ELDCK-CE REMOTENCDDC CLKDDC DATAGND+5VHP DET#21: HPD PartHDMI INPUT 3D2+D2 SHIELDD2-D1+D2 SHIELDD1-D1 SHIELDD0+D0-CK+D1 SHIELDCK-CE REMOTENCDDC CLKDDC DATAGND+5VHP DET#21: HPD PartHDMI INPUT 4Worst Measured CurrentsADV7630 3.3V Decoupling Capacitor63. EDID_ENAMUXVCCCEC_OUTCEC_INDDC_SCL_COMP5V_DIN_D_

32、CLK-RESETBAVCCAVEEI2C_SCLOUT_DATA2+TX_EN23. IN_A_DATA2+IN_B_DATA0+HPD_AIN_B_DATA1-IN_B_DATA1+AVCCIN_B_DATA2-IN_B_DATA2+SEL0IN_A_CLK-IN_A_CLK+SEL1IN_A_DATA0-22. IN_A_DATA2-39. I2C_ADDR1HPD_DAVCCIN_C_CLK-I2C_ADDR0AVEE58. HPD_C43. AVCC41. IN_D_DATA0-1. IN_B_CLK-2. IN_B_CLK+3. HPD_BIN_B_DATA0-IN_A_DATA0

33、+18. AVCC19. IN_A_DATA1-20.IN_A_DATA1+21. AVEE61. EDID_SCL40. I2C_SDAOUT_DATA2-OUT_DATA1+OUT_DATA1-OUT_DATA0+OUT_DATA0-OUT_CLK+OUT_CLK-38. IN_D_CLK+42. IN_D_DATA0+IN_D_DATA1-IN_D_DATA1+IN_D_DATA2-IN_D_DATA2+IN_C_CLK+IN_C_DATA0-IN_C_DATA0+IN_C_DATA1-IN_C_DATA1+59. IN_C_DATA2-60. IN_C_DATA2+62. EDID_S

34、DADDC_SDA_COMDDC_SCL_DDDC_SDA_DDDC_SCL_CDDC_SDA_CDDC_SCL_BDDC_SDA_BDDC_SCL_ADDC_SDA_A78. P5V_C79. P5V_B80. P5V_A170mA (561mW)HDMI4HDMI3HDMI2HDMI_DDCPWR INPUTTO HDMI RX (7850)From MCUI2C Address : 0 x96I2C_ADDR1 I2C_ADDR0 - ADDR000110110 x900 x920 x940 x96OPENOPENOPENOPEN12.08.02MULTI. LABANAMISSUEPM

35、P2012.05.292012.05.292012.05.292012.06.07191817161514131211109876?4321JK1004Q1107T1P141CQ1108T1N241CR112122KR11201KC11040.1uF / 16VR111947KR1124100R112347KR11224.7K_NC191817161514131211109876?4321JK1005Q1105T1P141CQ1106T1N241CR111522KR11141KC11030.1uF / 16VR111347KR1118100R111747KR11164.7K1918171615

36、14131211109876?4321JK1006Q1103T1P141CQ1104T1N241CR110922KR11081KC11020.1uF / 16VR110747KR1112100R111147KR11104.7K191817161514131211109876?4321JK1007Q1101T1P141CQ1102T1N241CR110322KR11021KC11010.1uF / 16VR110147KR1106100R110547KR11044.7KC110510uF/6.3VC11060.1uF / 16VC11090.1uF / 16VL11019R005ZC11070.

37、1uF / 16VC11080.1uF / 16V? ? ? ? ? ? ? ? ? ? ?495051525354555657585960616263646566676869707172737475?77787980IC1101ADV3002C11100.1uF / 16VC11110.1uF / 16VC11121000PQ1109CVTRT1N441CNCR11394.7Kohm_NCR11351005 / 1/16W / 0ohmR11361005 / 1/16W / 0ohmR112910KohmR112810KohmR112710KohmR11262.2KohmR11252.2Ko

38、hmR11344.7KohmR11324.7KohmR11334.7KohmR11404.7K_NCR11414.7K_NCR11424.7KohmR11434.7KohmR11300_NCR11310_NCR11381005 / 1/16W / 0ohmR11371005 / 1/16W / 0ohmD1104D1103D1102D1101D1116D1115D1114D1113D1128D1127D1126D1125D1140D1139D1138D1137D1149CVDRB521S-30TP31TP34TP37TP40TP44TP45R11441005 / 1/16W / 0ohmR10

39、6410KohmR106510KohmR106610KohmR11800ohmCECHDMI_4_RX_HPDHDMI_4_RX_PWRHDMI_4_RX_DDC_SCLHDMI_4_RX_DDC_SDAHDMI_4_RX_D2-HDMI_4_RX_D2+HDMI_4_RX_D1-HDMI_4_RX_D1+HDMI_4_RX_D0-HDMI_4_RX_D0+HDMI_4_RX_CK-HDMI_4_RX_CK+CECHDMI_5_RX_HPDHDMI_5_RX_PWRHDMI_5_RX_DDC_SCLHDMI_5_RX_DDC_SDAHDMI_5_RX_D2-HDMI_5_RX_D2+HDMI_

40、5_RX_D1-HDMI_5_RX_D1+HDMI_5_RX_D0-HDMI_5_RX_D0+HDMI_5_RX_CK-HDMI_5_RX_CK+CECHDMI_6_RX_HPDHDMI_6_RX_PWRHDMI_6_RX_DDC_SCLHDMI_6_RX_DDC_SDAHDMI_6_RX_D2-HDMI_6_RX_D2+HDMI_6_RX_D1-HDMI_6_RX_D1+HDMI_6_RX_D0-HDMI_6_RX_D0+HDMI_6_RX_CK-HDMI_6_RX_CK+CECHDMI_7_RX_HPDHDMI_7_RX_PWRHDMI_7_RX_DDC_SCLHDMI_7_RX_DDC_

41、SDAHDMI_7_RX_D2-HDMI_7_RX_D2+HDMI_7_RX_D1-HDMI_7_RX_D1+HDMI_7_RX_D0-HDMI_7_RX_D0+HDMI_7_RX_CK-HDMI_7_RX_CK+AVDD_3V3_3002_M1+3.3V_MUXAVDD_3V3_3002_M1HDMI_RX_RSTAVDD_3V3_3002_M1HDMI_MUX1_TX_D2+HDMI_MUX1_TX_D2-HDMI_MUX1_TX_D1+HDMI_MUX1_TX_D1-HDMI_MUX1_TX_D0+HDMI_MUX1_TX_D0-HDMI_MUX1_TX_CK+HDMI_MUX1_TX_

42、CK-AVDD_3V3_3002_M1HDMI_5_RX_PWRHDMI_6_RX_PWRHDMI_7_RX_PWRHDMI_5_RX_HPDHDMI_6_RX_HPDHDMI_7_RX_HPDHDMI_5_RX_D2-HDMI_5_RX_D2+HDMI_5_RX_D1-HDMI_5_RX_D1+HDMI_5_RX_D0-HDMI_5_RX_D0+HDMI_5_RX_CK-HDMI_5_RX_CK+HDMI_6_RX_D2-HDMI_6_RX_D2+HDMI_6_RX_D1-HDMI_6_RX_D1+HDMI_6_RX_D0-HDMI_6_RX_D0+HDMI_6_RX_CK-HDMI_6_R

43、X_CK+HDMI_7_RX_D2-HDMI_7_RX_D2+HDMI_7_RX_D1-HDMI_7_RX_D1+HDMI_7_RX_D0-HDMI_7_RX_D0+HDMI_7_RX_CK-HDMI_7_RX_CK+HDMI_5_RX_DDC_SCLHDMI_5_RX_DDC_SDAHDMI_6_RX_DDC_SCLHDMI_6_RX_DDC_SDAHDMI_7_RX_DDC_SCLHDMI_7_RX_DDC_SDAHDMI_MUX1_TX_DDC_SCLHDMI_MUX1_TX_DDC_SDAAVDD_3V3_3002_M1+5VH1+5VH1ADV3002_RESETADV3002_HP

44、DADV3002_HPDADV3002_HPDADV3002_HPDADV3002_SDAADV3002_SCL AVR 2700 harman/kardon 144937654321REVISIONSCHEMATIC DIAGRAMSHEETMODELDRAWING NODESIGNCHECKAPPROVEADC6ABCD54321BAVR270/370(HDMI RX / Decoder)CUPxxxxxZMUX1CVBS1CVBS2PBPRYCOMP_SYNCAnalog InputFrom MCUNCTo ADV8003 RX PartTo DSP PartHDMI 2/3/4Chan

45、ge : 11.09.273.3V Power Supply1.8V Power SupplyFrom MCUDDR2 Memory (ADV7850 Used)ADV7850 DDR2 Interface09.03.18Added : 100K ohmGNDA8A7A6A5A4A3A2A1OE1VCCOE2Y1Y2Y3Y4Y5Y6Y7Y8GNDA8A7A6A5A4A3A2A1OE1VCCOE2Y1Y2Y3Y4Y5Y6Y7Y8Digital AudioFrom HDMI RXDigital AudioTo DSP PartDigital AudioFrom DSP PartDigital Au

46、dioTo HDMI TXH: Bypass ModeL: Processing ModeAUDIO S/W Part ANALOG VideoAnalog Video IN/OUTMUX2HDMI 5/6/711.12.2712.08.0211.12.27W.Y.YL.J.HS.K.SS_CS_YAVRx70 - 8PAVRx70 - OPENARCAM - USE12.08.02MULTI. LABANAMISSUEPMP64COM75INHGNDGNDCBA3012VCCFRONT_HDMID2+D2 SHIELDD2-D1+D2 SHIELDD1-D1 SHIELDD0+D0-CK+D

47、1 SHIELDCK-CE REMOTE+5VADDC CLKDDC DATAGND+5VHP DETINPUT-6CK SHIELD+3.3VA+3.3VATX_ENFRONT HDMIHDMI 1CUP12457Z2012.06.07C12220.1uF / 16VC12240.1_NCC12230.1_NC87654321RN120633ohmX 487654321RN120533ohm X 4VDD_01NC_01VSS_01VSSQ_01UDQSVDDQ_01DQ14VSSQ_02UDMUDQSVSSQ_03DQ15VDDQ_02DQ9VDDQ_03VDDQ_04DQ8VDDQ_05

48、DQ12VSSQ_04DQ11DQ10VSSQ_05DQ13VDD_02NC_02VSS_02VSSQ_06LDQSVDDQ_06DQ6VSSQ_07LDMLDQSVSSQ_08DQ7VDDQ_07DQ1VDDQ_08VDDQ_09DQ0VDDQ_10DQ4VSSQ_09DQ3DQ2VSSQ_10DQ5VDDLVREFVSS_03VSSDLCKVDD_03CKEWERASCKODTNC_03BA0BA1CASCSA10A1A2A0VDD_04VSS_04A3A5A6A4A7A9A11A8VSS_05VDD_05A12NC_04NC_06NC_05IC1202CVIK4T51163QI-HCE7

49、A1GND_028A2GND_151A3GND_135A4RXB_2+A5RXB_1+A6RXB_0+A7RXB_C+A8ARC_BA9TVDD_01A10RXC_2+A11RXC_1+A12RXC_0+A13RXC_C+A14ARC_CA15GND_131A16RXD_2+A17RXD_1+A18RXD_0+A19RXD_C+A20ARC_DA21GND_129A22GND_133A23GND_031B1ARC_AB2HPA_AB3GND_136B4RXB_2-B5RXB_1-B6RXB_0-B7RXB_C-B8HPA_BB9TVDD_13B10RXC_2-B11RXC_1-B12RXC_0

50、-B13RXC_C-B14HPA_CB15GND_130B16RXD_2-B17RXD_1-B18RXD_0-B19RXD_C-B20HPA_DB21GND_128B22ACMUXOUT_RB23ACMUXOUT_LC1RXA_C+C2RXA_C-C3CVDD_03C4GND_134C5GND_023C6GND_148C7GND_149C8VDD_EEPROMC9TVDD_12C10TVDD_11C11TVDD_10C12TVDD_09C13TVDD_08C14TVDD_07C15GND_029C16TVDD_06C17TVDD_05C18TVDD_04C19TVDD_03C20GND_024