Yamaha-RX777-rec-sm(1) 维修电路原理图.pdf

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1、SERVICE MANUALSTEREO RECEIVERRX-777100749IMPORTANT NOTICEThis manual has been provided for the use of authorized YAMAHA Retailers and their service personnel.It has been assumed that basic service procedures inherent to the industry, and more specifically YAMAHA Products, are alreadyknown and unders

2、tood by the users, and have therefore not been restated.WARNING:Failure to follow appropriate service and safety procedures when servicing this product may result in personalinjury, destruction of expensive components, and failure of the product to perform as specified. For these reasons,we advise a

3、ll YAMAHA product owners that any service required should be performed by an authorizedYAMAHA Retailer or the appointed service representative.IMPORTANT:The presentation or sale of this manual to any individual or firm does not constitute authorization, certification orrecognition of any applicable

4、technical capabilities, or establish a principle-agent relationship of any form.The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research, engineering, andservice departments of YAMAHA are continually striving to improve YAMAHA products. Modifica

5、tions are, therefore, inevitableand specifications are subject to change without notice or obligation to retrofit. Should any discrepancy appear to exist, pleasecontact the distributors Service Division.WARNING:Static discharges can destroy expensive components. Discharge any static electricity your

6、 body may haveaccumulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to this buss).IMPORTANT:Turn the unit OFF during disassembly and part replacement. Recheck all work before you apply power to the unit.RX-777P.O.Box 1, Hamamatsu, JapanI CONTENTSTO SERVICE

7、 PERSONNEL . 1IMPEDANCE SELECTOR . 1REAR PANELS . 2SPECIFICATIONS. 3INTERNAL VIEW . 4DISASSEMBLY PROCEDURES . 5OPERATION P.C.B. CHECK. 5AMP ADJUSTMENTS. 6TEST MODE . 6DISPLAY DATA . 8IC DATA . 910PRINTED CIRCUIT BOARD . 1122BLOCK DIAGRAM. 2324SCHEMATIC DIAGRAM . 2528PARTS LIST . 2938REMOTE CONTROL T

8、RANSMITTER . 39RadioFans.CN 收音机爱 好者资料库RX-777RX-7771WALLOUTLETEQUIPMENTUNDER TESTAC LEAKAGETESTER OREQUIVALENTINSULATINGTABLEWARNING: CHEMICAL CONTENT NOTICE!The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and /or plastic(where applicable) com

9、ponents may also contain traces of chemicals found by the California Health and Welfare Agency(and possibly other entities) to cause cancer and/or birth defects or other reproductive harm.DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REA-SON WHATSOEVER!Avoid

10、prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or exposeeyes to solder/flux vapor!If you come in contact with solder or components located inside the enclosure of this product, wash your hands beforehandling food.I TO SERVICE PERSONNEL1. Criti

11、cal Components InformationComponents having special characteristics are marked Zand must be replaced with parts having specifications equalto those originally installed.2. Leakage Current Measurement (For 120V Models Only)When service has been completed, it is imperative to verifythat all exposed co

12、nductive surfaces are properly insulatedfrom supply circuits.GMeter impedance should be equivalent to 1500 ohm shuntedby 0.15F.GLeakage current must not exceed 0.5mA.GBe sure to test for leakage with the AC plug in both polarities.I IMPEDANCE SELECTORIMPEDANCE SELECTORWARNING:Do not change the IMPED

13、ANCE SELECTOR switch setting while the power to this unit is on, otherwise this unit may be damaged.RadioFans.CN 收音机爱 好者资料库RX-777RX-7772I REAR PANELSU modelC modelA modelRX-777RX-7773I SPECIFICATIONSI AUDIO SECTIONMinimum RMS Output Power (Power Amp. Section)8 ohms, 20 Hz to 20 kHz, 0.019% THD .100W

14、 + 100W6 ohms, 20 Hz to 20 kHz, 0.03% THD .120W + 120WDynamic Power Per Channel (IHF)8/6/4/2 ohms . 140/170/220/290 WPower Band Width8 ohms, 50W, 0.03% THD .10 Hz to 50 kHzDamping Factor8 ohms, 20 Hz to 20 kHz, SPEAKER-A . 240 or moreInput Sensitivity / Input ImpedancePHONO MM . 2.5 mV / 47 k-ohmsCD

15、, etc. . 150 mV / 47 k-ohmsMAIN IN . 1 V / 30 k-ohmsMaximum Input Signal LevelPHONO MM (1 kHz, 0.015% THD) . 115 mVCD, etc. (1 kHz, 0.015% THD) . 2.2 VOutput Level / Output ImpedancePRE OUT . 1 V / 1.2 k-ohmsREC OUT (PHONO) . 150 mV / 1.7 k-ohmsHeadphone Jack Rated Output / Impedance0.015% THD, 8 oh

16、ms, 1 kHz, 150 mV . 0.47 V / 470 ohmsFrequency ResponseCD, etc. (20 Hz to 20 kHz). 00.5 dBMAIN IN (20 Hz to 20 kHz) . 00.5 dBCD (CD DIRECT AMP ON, 20 Hz to 100 kHz) . 01.0 dBRIAA Equalization DeviationPHONO MM (20 Hz to 20 kHz) . 0 0.5 dBTotal Harmonic Distortion(20 Hz to 20 kHz)PHONO MM, to REC OUT

17、 (3 V) .0.008% or lessCD, etc. to PRE OUT (1 V) .0.007% or lessCD, etc. to SP OUT (50 W / 8 ohms) .0.012% or lessSignal to Noise Ratio (IHF-A network)PHONO MM (5 mV Input shorted) .87 dB or moreCD (CD DIRECT AMP ON, 150 mV Input shorted) .110 dB or moreResidual Noise (IHF-A network)CD DIRECT AMP ON

18、. 30 VPURE DIRECT ON . 110 VChannel SeparationCD, etc. (Input 5.1 k-ohms shorted, 1 kHz).65 dB or moreCD, etc. (Input 5.1 k-ohms shorted, 10 kHz).50 dB or moreTone Control CharacteristicsBass:Boost/Cut . 10 dB (20 Hz)Turnover Frequency . 350 HzTreble: Boost/Cut . 10 dB (20 kHz)Turnover Frequency . 3

19、.5 kHzContinuous Loudness ControlAttenuation, 1 kHz. -30 dBGain Tracking Error0 to -60 dB. 2 dB or lessI FM SectionTuning RangeU, C models . 87.5 to 107.9 MHzA model .87.50 to 108.00 MHz50 dB Quieting Sensitivity (IHF)(1 kHz, 100% Mod.)Mono . 2.0 V (17.3 dBf)Stereo . 25 V (39.2 dBf)Usable Sensitivit

20、y (IHF)Mono . 1.0 V (11.2 dBf)Selectivityat 400 kHz . 70 dBSignal to Noise Ratio (IHF)Mono / Stereo .76 dB / 70 dBHarmonic Distortion(1 kHz)Mono / Stereo . 0.2 / 0.3 %Stereo Separation1 kHz . 45 dBFrequency Response20 Hz to 15 kHz .+0.5 / -2 dBAntenna Input. 75 ohms unbalancedI AM SectionTuning Rang

21、eU, C models . 530 to 1,710 kHzA model . 531 to 1,611 kHzUsable Sensitivity. 300 V/mAntenna. Loop AntennaI Video SectionVideo Signal TypeU, C models . NTSCA model . PALVideo Signal Level. 1 Vp-p / 75 ohmsMaximum Input Level. 1.5 Vp-pSignal to Noise Ratio.50 dB or moreMonitor Out Frequency Response.5

22、 Hz to 10 MHz, -3 dBI GeneralPower SupplyU, C models .AC 120 V, 60 HzA model .AC 240 V, 50 HzPower ConsumptionU model . 260 WC model . 210 WA model . 200 WStandby Power ConsumptionU, C models . 0.9 WA model . 1.0 WAC OutletsU, C models2 switched outlets . 100W max. totalA model1 switched outlet . 10

23、0W max.Dimensions (W x H x D). 435 x 151 x 390.3 mm (17-1/8 x 5-15/16 x 15-5/16)Weight. 9.8 kg (21 lbs. 10 oz.)Finish. Black colorAccessories. Remote control transmitter x 1,Manganese batteries (size AA, R06) x 2,Indoor FM antenna x 1,AM loop antenna x 1* Specifications are subject to change without

24、 notice.U . U.S.A. modelC . Canadian modelA . Australian modelRX-777RX-777435 (17-1/8)Unit : mm (inch)151 (5-15/16)130 (5-1/8)348 (13-11/16)21(13/16)21(13/16)21.3 (13/16)390.3 (15-5/16) DIMENSIONS4I INTERNAL VIEWwrtyuei o!1 !2!0!3!4!5!6qq MAIN (5) P.C.B.w MAIN (2) P.C.B.e MAIN (3) P.C.B.r MAIN (1) P

25、.C.B.t INPUT (4) P.C.B.y INPUT (1) P.C.B.u INPUT (2) P.C.B.i INPUT (3) P.C.B.o OPERATION (8) P.C.B.!0 OPERATION (1) P.C.B.!1 OPERATION (6) P.C.B.!2 MAIN (4) P.C.B.!3 OPERATION (4) P.C.B.!4 OPERATION (5) P.C.B.!5 OPERATION (2) P.C.B.!6 OPERATION (3) P.C.B.RX-777RX-777Top CoverBottom CoverFront Panelq

26、rerrewqFig. 1Rear PanelOPERATION (8) P.C.B.CableSolder the end of the wire to the ground pointof OPERATION (8) P.C.B. (refer to P.15 D-4)J420J421Operation P.C.B. (8)Rear Panelqqqww5I OPERATION P.C.B. CHECKPreparation before OPERATION P.C.B. Checka. Remove the Top Cover.b. Remove 13 screws (q) on the

27、 Rear Panel asshown in Fig. 1.c. Remove 2 screws (w) on the OPERATION (8) P.C.B.as shown in Fig. 1.Fig. 1Fig. 2d.Spread a cloth over the Main Chassis as shown in Fig. 2.e.Put the OPERATION (8) P.C.B. on end as shown in Fig. 2.f. Connect the ground point of OPERATION (8) P.C.B. torear panel by using

28、wire as shown in Fig. 2.f. Connect the ground point of OPERATION (8) P.C.B. torear panel by using wire as shown in Fig. 2.g. Connect the J420, J421 of OPERATION (8) P.C.B. torear panel by using wire as shown in Fig. 2.CAUTION!The ground point, J420 and J421 must be connected toRear Panel to keep the

29、 circuit in normal operation whenOPERATION (8) P.C.B. is removed from main chassis.I DISASSEMBLY PROCEDURES (Remove parts in the order as numbered.) Disconnect the power cord from the AC outlet.1. Removal of Top CoverRemove 4 screws (q) and 4 screws (w) in Fig. 1.2. Removal of Front PanelRemove 7 kn

30、obs and 6 screws (e) in Fig. 1.3. Removal of Bottom CoverRemove 6 screws (r) in Fig. 1.RX-777RX-7776I AMP ADJUSTMENTSConfirmation of Idling CurrentRight after power is turned on, confirm that the voltages of between R111-R135 and R112-R136 are between 0.1mV and10mV.If they exceed 10mV, cut R175, R17

31、6. Then reconfirm they are between 0.1mV and 10mV.Note)If R175 (L ch) or R176 (R ch) have already been cut off and idling current does not flow, reconnect R175 (1k) or R176 (1k).Q117 and Q118 are transistors for temperature correction. Apply silicone grease to the contact surface with the heat sink.

32、R111R175R176R135L ch0.1mV 10.0mV(DC)R112R136R ch0.1mV 10.0mV(DC)R175 (L ch)R176 (R ch)Cut offI TEST MODECAUTION: Before setting to the TEST mode, write down the existing preset memory content of the Tuner in a table asshown below. (This is because setting to the TEST mode will cause the memory conte

33、nt to be as factory set,i.e., all the preset memory by the user will be erased.)Preset groupP1P2P3P4P5P6P7P8ABCDEPreset groupP1P2P3P4P5P6P7P8A/C/EU, C87.5 MHz90.1 MHz95.1 MHz98.1 MHz107.9 MHz88.1 MHz106.1 MHz 107.9 MHzA87.5 MHz90.1 MHz95.1 MHz98.1 MHz108.0 MHz88.1 MHz106.1 MHz 108.0 MHzB/DU, C630 KH

34、z1080 KHz1440 KHz530 KHz1710 KHz900 KHz1350 KHz1400 KHzA630 KHz1080 KHz1440 KHz531 KHz1611 KHz900 KHz1350 KHz1404 KHzG Factory preset memory contentRX-777RX-7771. Test mode for the DISPLAY to light all segments.Turn the POWER SW ON while pressing the EDIT andNo. 8 keys simultaneously. The unit enter

35、s the TESTmode for the DISPLAY to light all segments.2. Test mode for the microprocessorsoftware version check.While in the DISPLAY test mode, push the No. 1 key to enterthe TEST mode for the microprocessor software versioncheck.3. Memory reset modeWhile in the DISPLAY test mode, push the A/B/C/D/Ek

36、ey to enter the Memory reset mode and all RAMsettings are reset to the factory settings.4. Test mode to display the ProtectionPS port (pin No. 80) input voltage.Turn the POWER SW ON while pressing the EDIT andNo. 6 keys simultaneously. The unit enters the TESTmode to display the Protection PS port i

37、nput voltage asan AD value for 3 sec.The microprocessor will not respond to any commandswhile in this mode.5. Test mode to display the ProtectionDC port (pin No. 79) input voltage.Turn the POWER SW ON while pressing the EDIT andNo. 7 keys simultaneously. The unit enters the TESTmode to display the P

38、rotection DC port input voltage asan AD value for 3 sec.The microprocessor will not respond to any commandswhile in this mode.Cancel: When the POWER is turned OFF, the TEST mode is cancelled.PROTECTION FUNCTIONWhen the microprocessor detect an abnormal condition, the Power is turned off.Vref is the

39、AD reference Voltage. The microprocessor compares the monitored voltage relative to Vref = 255.PS Error DetectionPS error detection begins 1 sec. after Power ON. If the monitored level is lower than 53/255 Vref or higher than134/255 Vref (AD value), protection is activated.Output DC Voltage Detectio

40、nDC voltage detection begins 4.4 sec. agter Power ON. If the monitored level is lower than 12/255 Vref or higher than115/255 Vref (AD value), protection is activated.Over Current DetectionOver current detection begins immediately after Power ON. If the monitored level is High, protection is activate

41、d.7AbnormalNormalAbnormalAbnormalNormalAbnormalRX-777RX-77713G12G11G10G9G8G7G6G5G4G3G2G1GP1aaaaaaaaaaaP2bbbbbbbbbbbP3cccccccccccP4dddddddddddP5eeeeeeeeeeeP6fffffffffffP7gggggggggggP8S1hhhhhhhhhhhP9jjjjjjjjjjjP10S2kkkkkkkkkkkP11mmmmmmmmmmmP12S3nnnnnnnnnnnP13pppppppppppP14S4rrrrrrrrrrrP15t, ut, ut, ut

42、, ut, ut, ut, ut, ut, ut, ut, uP16w, vG V301 : 13-BT-181GK (V6994700)G PIN CONNECTIONG GRID ASSIGNMENTG ANODE CONNECTIONPin No.ConnectionPin No.41F240F239NP38NP3713G3612G3511G3410G339G328G317G306G295G284G273G262G251G24NX23NX22NX21NX20P119P218P317P416P515P614P713P812P911P1010P119P128P137P146P155P164N

43、P3NP2F11F1ConnectionNote : 1) F1, F2 . Filament 2) NP . No pin 3) NX . No extend pin 4) DL . Datum Line 5) 1G 13G . Grid (12G5G, 3G, 2G)PATTERN AREA1G2G3G4G5G6G7G8G9G10G11G12G13G$1qtuafhgmjknpdrebc(4G)tuafhgmjknpdrebvcwS4S3S2S1I DISPLAY DATA8RX-777RX-777Pin No.PortI/OFunction1P75O/R2MUZONE 2 OUT MUT

44、INGH: ON2P74O/MUTEMAIN IN MUTINGH: ON3P73IVERVERIFICATION VOLTAGE4P72IRECREC OUT SELECTOR5P71IKYAD1KEY AD IN 16P70IKYAD2KEY AD IN 27P61OPOMUTEPRE OUT MUTINGH: ON8P60 OPEN9P47IREMREMOTE CONTROL IN10/RESETI/RESETRESET11P91IENLINPUT SELECTOR B IN12P90IENRINPUT SELECTOR A IN13VssIVssGND14XinIXin4 MHz15X

45、outOXout4 MHz16VccIVcc+5 V17P46IPDonPURE DIRECT INL: ON18P45ICDonCD DIRECT INL: ON19P44IBinSP B INL: ON20P43IAinSP A INL: ON21P42IPWSWPOWER SW IN22P41 OPEN23P40IPDPOWER DOWN DETECT24P87ORY PSPOWER RELAY OUTH: ON25P86ORY BSP RELAY B OUTH: ON26P85ORY ASP RELAY A OUTH: ON27P84ORY HPHP RELAY OUTH: ON28V

46、eeIVee-25 V29P83ODIG 13FL DIGIT 13H: ON30P82ODIG 12FL DIGIT 12H: ON31P81ODIG 11FL DIGIT 11H: ON32P80ODIG 10FL DIGIT 10H: ON33P37ODIG 9FL DIGIT 9H: ON34P36ODIG 8FL DIGIT 8H: ON35P35ODIG 7FL DIGIT 7H: ON64P20/Buz02/FLD063P21/FLD162P22/FLD261P23/FLD360P24/FLD459P25/FLD558P26/FLD657P27/FLD756P00/FLD855P

47、01/FLD954P02/FLD1053P03/FLD1152P04/FLD1251P05/FLD1350P06/FLD1449P07/FLD1548P10/FLD1647P11/FLD1746P12/FLD1845P13/FLD1944P14/FLD2043P15/FLD2142P16/FLD2241P17/FLD2340P30/FLD2439P31/FLD2538P32/FLD2637P33/FLD2736P34/FLD2835P35/FLD2934P36/FLD3033P37/FLD3132P80/FLD3231P81/FLD3330P82/FLD3429P83/FLD3528VEE27

48、P84/FLD3626P85/RTP0/FLD3725P86/RTP1/FLD38P57/SRDV2/SCLK22P56/SCLK21P55/TxDP54/RxDP53/SCLK12P52/SCLK11P51/SOUT1P50/SIN1AVSSVREFP65/SSTB1/AN11P64/INT4/SBUSY1/AN10P63/AN0P62/SRDY1/AN8P77/AN7P76/AN665666768697071727374757677787980P75/AN5P74/AN4P73/AN3P72/AN2P71/AN1P70/AN0P61/CNTR0/CNTR2P60/CNTR1P47/INT2

49、RESETP91/XCOUTP90/XCINVSSXINXOUTVCCP46/TSOUTP45/T1OUTP44/PWM1P43/BUZ01P42/INT3P41/INT1P40/INT0P87/PWM0/FLD391234567891011121314151617181920212223249I IC DATAIC301 : M38B57M6-172FP8 bit -COM (Main CPU)RX-777Pin No.PortI/OFunction36P34ODIG 6FL DIGIT 6H: ON37P33ODIG 5FL DIGIT 5H: ON38P32ODIG 4FL DIGIT

50、4H: ON39P31ODIG 3FL DIGIT 3H: ON40P30ODIG 2FL DIGIT 2H: ON41P17ODIG 1FL DIGIT 1H: ON42P16OSEG 1FL SEGMENT 1H: ON43P15OSEG 2FL SEGMENT 2H: ON44P14OSEG 3FL SEGMENT 3H: ON45P13OSEG 4FL SEGMENT 4H: ON46P12OSEG 5FL SEGMENT 5H: ON47P11OSEG 6FL SEGMENT 6H: ON48P10OSEG 7FL SEGMENT 7H: ON49P07OSEG 8FL SEGMEN