Yamaha-EMX68S-mix-sm 维修电路原理图.pdf

SERVICE MANUALHAMAMATSU, JAPAN1,387K-7041 Printed in Japan 2002.03PA011625 CONTENTSSPECIFICATIONS . 3PANEL LAYOUT. 7CIRCUIT BOARD LAYOUT & WIRING. 10DIMENSIONS .11BLOCK & LEVEL DIAGRAM. 12DISASSEMBLY PROCEDURE . 14LSI PIN DESCRIPTION . 20IC BLOCK DIAGRAM. 22CIRCUIT BOARDS . 23INSPECTION . 37OVERALL CIRCUIT DIAGRAMPARTS LISTEMX68SEMX88SThis document is printed on chlorine free (ECF) paper with soy ink. OPTIONRK-88 RACK MOUNT KITEMX68S 20020325-92000EMX88S 20020325-105000RK8820020325-2500RadioFans.CN 收音机爱 好者资料库2EMX68S / EMX88SIMPORTANT NOTICEThis manual has been provided for the use of authorized Yamaha Retailers and their service personnel. It has been assumed thatbasic service procedures inherent to the industry, and more specifically Yamaha Products, are already known and understood by theusers, and have therefore not been restated.WARNING:Failure to follow appropriate service and safety procedures when servicing this product may result in per-sonal injury, destruction of expensive components and failure of the product to per form as specified. Forthese reasons, we advise all Yamaha product owners that all service required should be performed by anauthorized Yamaha Retailer or the appointed service representative.IMPORTANT:This presentation or sale of this manual to any individual or firm does not constitute authorization, certifica-tion, recognition of any applicable technical capabilities, or establish a principal-agent relationship of anyform.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. Modifications are, therefor, inevitable andchanges in specification 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 body may haveaccumulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to thisbuss).IMPORTANT:Turn the unit OFF during disassembly and parts replacement. Recheck all work before you apply power tothe unit.WARNING: CHEMICAL CONTENT NOTICE!The solder used in the production of this product contains LEAD. In addition, other electrical / electronic and / or plastic (whereapplicable) components may also contain traces of chemicals found by the California Health and Welfare Agency (and possibly otherentities) 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 REASONWHAT SO EVER!Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or expose eyes tosolder / flux vapor!If you come in contact with solder or components located inside the enclosure of this product, wash your hands before handling food.IMPORTANT NOTICE FOR THE UNITED KINGDOMConnecting the Plug and CordWARNING:THIS APPARATUS MUST BE EARTHEDIMPORTANT: The wires in this main lead are coloured in accor-dance with the following code: GREEN-AND-YELLOW: EARTH BLUE: NEUTRAL BROWN: LIVEAs the colours of the wires in the main lead of this apparatus may notcorrespond with the coloured markings identifying the terminals in yourplug, proceed as follows:The GREEN-and-YELLOW wire must be connected to the terminal in theplug that is marked with the letter E or the safety earth symbol (or colouredGREEN or GREEN-and-YELLOW).The BLUE wire must be connected to the terminal that is marked with theletter N (or coloured BLACK).The BROWN wire must be connected to the terminal that is marked withthe letter L (or coloured RED).This applies only to products distributed by Yamaha Kemble Music (U. K.) Ltd. WARNINGComponents having special characteristics are marked andmust be replaced with parts having specification equal to thoseoriginally installed.RadioFans.CN 收音机爱 好者资料库3EMX68S / EMX88S SPECIFICATIONSG General specificationsMaximum output powerMAIN L, R: 400 W+400 W/4 0.5% THD at 1 kHz, 270 W+270 W/8 0.5% THD at 1 kHzMAIN BRIDGE: 800 W/8 0.5% THD at 1 kHzFrequency response20 Hz20 kHz +1 dB, 3 dB 1 W output into 8 (SPEAKERS OUT)20 Hz20 kHz +1 dB, 3 dB +4 dB output into 10 k (MAIN OUT, MONITOR OUT, EFFECT OUT)Total harmonic distortionLess than 0.5% 20 Hz20 kHz, 200 W output into 4 (SPEAKERS OUT)Less than 0.3% 20 Hz20 kHz, +14 dB output into 10 k (MAIN OUT, MONITOR OUT, EFFECT OUT)Hum & noise(Average, Rs=150)(with 20 Hz20 kHz BPF)124 dB equivalent input noise, 65 dB residual output noise (SPEAKERS OUT)88 dB residual output noise (MAIN OUT, MONITOR OUT)79 dB (MAIN OUT)Master level control: nominal level, All channel level controls: minimum75 dB (MONITOR OUT)Master level control: nominal level, All channel level controls: minimum69 dB (MAIN OUT)Master level control: nominal level, 1 channel level control: nominal level84 dB (EFFECT OUT)All channel level controls: minimum64 dB (EFFECT OUT)1 channel level control: nominal levelMaximum voltage gain86 dB CH IN (Lo-Z) to SPEAKERS OUT66 dB CH IN (Lo-Z) to MAIN OUT, MONITOR OUT66 dB CH IN (Lo-Z) to EFFECT OUT48 dB CH IN (Lo-Z) to REC OUT56 dB CH IN (Hi-Z) to MAIN OUT, MONITOR OUT46 dB CH IN (Super Hi-Z) to MAIN OUT26 dB AUX IN to MAIN OUT24 dB 2TR IN to MAIN OUT66 dB MIC IN to MAIN OUT26 dB LINE IN to MAIN OUTCrosstalk at 1 kHz65 dB adjacent input, 65 dB input to outputInput channel equalization15 dB MaximumHIGH10 kHz shelvingMID2.5 kHz peakingLOW100 Hz shelving* Turn over/roll-off frequency of shelving: 3 dB below maximum variable level.Meters5 POINTS LED METER (MAIN OUT L/R, MONITOR OUT)Graphic equalizer7 bands (125, 250, 500, 1k, 2k, 4k, 8k Hz)12 dB Maximum (MAIN OUT, MONITOR OUT)Internal digital effect16 programs, parameter control, tap delay controlPhantom power+15 V (balanced input)LimiterComp. : THD0.5% (SPEAKERS OUT)LIMIT indicatorsTurns on. : THD0.5% (SPEAKERS OUT)Protection circuit (Power amp)POWER switch on/off mute, DC detection, TEMP (heatsink temp. 90C)Fan circuitstop low speed (50C) variable high speed (70C)Foot switch (FC5)DIGITAL EFFECT MUTE : on/off, Tap delayOptional accessoriesRK-88, FC5Power requirement/Power consumptionUSA and Canada120 V AC 60 Hz/300WEurope230 V AC 50 Hz/350WOther240 V AC 50 Hz/350WDimensions (WxHxD)482 x 305 x 328 mmWeight15.5 kgSupplied accessoriesAC power cord, Owners Manual4EMX68S / EMX88S All output jacks are unbalanced. 0 dB=0.775 Vrms, 0 dBV=1 Vrms.Input connectorsPADActual load impedanceNominal impedanceInput levelConnector typeSensitivity*1*1. Sensitivity is the lowest level that can produce an output of +4 dB (1.23 V) or the nominal output level when the unit is set at maximum gain. (All level controls are at maximum position.)Nominal levelMax. before clippingCH INPUT (Low-Z)(CH14/16)OFF3 k50600 Mics62 dB (0.616 mV)50 dB (2.45 mV)20 dB (77.5 mV)XLR-3-31 type*2*2. Balanced.ON600 Lines32 dB (19.5 mV)20 dB (77.5 mV)+10 dB (2.45 V)CH INPUT (Hi-Z)(CH12/14)OFF10 k50600 Mics52 dB (1.95 mV)40 dB (7.75 mV)10 dB (245 mV)Phone jack (TRS)*2ON600 Lines22 dB (61.6 mV)10 dB (245 mV)+20 dB (7.75 V)CH INPUT(Super Hi-Z)(CH34/56)OFF470 k1k 42 dB (6.16 mV)30 dB (24.5 mV)0 dB (775 mV)Phone jack*3ON12 dB (195 mV)0 dB (775 mV)+10 dB (3.16 V)MIC INPUT3 k50600 Mics62 dB (0.616 mV)50 dB (2.45 mV)20 dB (77.5 mV)XLR-3-31 type*2LINE INPUT (L, R)10 k600 Line22 dB (61.6 mV)10 dB (245 mV)+20 dB (7.75 V)Phone jack*3*3. Unbalanced. 0 dB=0.775 Vrms, 0 dBV=1 Vrms.AUX IN (L, R)10 k600 Line22 dB (61.6 mV)10 dB (245 mV)+20 dB (7.75 V)Phone jack*32TR IN (L, R)10 k600 Line22 dBV (79.4 mV)10 dBV (316 mV)+17.8 dBV (7.76 V)Phono jack Output connectorsActual source impedanceNominal impedanceOutput levelConnector typeNominalMax. before clippingSPEAKERS OUT A, B (1, 2) 0.14/8 Speaker80 W/4(400 W/4)Phone jackBRIDGE0.18 Speaker160 W/8)Phone jackMAIN OUT (L, R)60010 k Lines+4 dB (1.23 V)+20 dB (7.75 V)Phone jackEFFECT OUT60010 k Lines+4 dB (1.23 V)+20 dB (7.75 V)Phone jackMONITOR OUT60010 k Lines+4 dB (1.23 V)+20 dB (7.75 V)Phone jackREC OUT (L, R)60010 k Lines10 dBV (316 mV)+10 dBV (3.16 V)Phono jack(800 W/8G Input specificaitonsG Output specificaitons5EMX68S / EMX88S6EMX68S / EMX88S7EMX68S / EMX88S PANEL LAYOUT?G CONTROL PANEL1. CONTROL SECTION Channel Control? Equalizer (HIGH, MID, LOW)? MONITOR control? EFFECT control? PAN control (EMX-68S/CH1-4, EMX-88S/CH1-6)BAL/PAN control (EMX-68S/CH5-6, EMX-88S/CH7-8)? LEVEL control? PAD switch (EMX-68S/CH1-4, EMX-88S/CH1-6) Digital Effect? PROGRAM selector? PARAMETER control? ON switch? TAP switch8EMX68S / EMX88S?2122232425? Graphic Equalizer? EFFECT RTN control? AUX IN control? 2TR IN control? MASTER control? Peak Level Indicator MAIN MONITOR PHANTOM switch, indicator POWER AMP YAMAHA SPEAKER PROCESSING? Graphic Equalizer? EFFECT RTN control? 2TR IN control? MASTER control21Peak Level Indicator22PHANTOM ON/OFF switch23LIMITER indicator24Power Amp select switch25ON/OFF switch9EMX68S / EMX88S2627?26ON/OFF switch27POWER ON/OFF switch,indicator STAND-BY POWER switch, indicator2. INPUT/OUTPUT SECTIONG REAR PANEL? INPUT terminal (Low-Z)(EMX-68S/CH1-4, EMX-88S/CH1-6)? INPUT terminal (Hi-Z)(EMX-68S/CH1-2, EMX-88S/CH1-4)? INPUT terminal (Super Hi-Z)(EMX-68S/CH3-4, EMX-88S/CH5-6)? INPUT terminal (MIC, LINE)(EMX-68S/CH5-6, EMX-88S/CH7-8)? EFFECT OUT terminal? FOOT SW terminal? INPUT TO MAIN terminal (AUX IN, 2TR IN)? OUTPUT terminal (REC OUT, MAIN(STEREO),MONITOR)? SPEAKERS terminal? AC IN socket10EMX68S / EMX88S CIRCUIT BOARD LAYOUT & WIRINGMIX88MIX68PWR 3/4PWR 3/4PWR 4/4PWR 4/4DSPPower TransformerPWR 2/4PWR 1/4PWR 2/4MIX88MIX68PWR 1/4DSPCN106CN107CN903CN104CN901CN101CN101CN105Power TransformerAC INLETDC FanPOWERON/OFF1234LocationConnector AssemblyRemarksParts No.1MIX68/88-PWR1/424185&2426 15P L=700V8426202MIX68/88-DSP100mm P=1.25MF127103PWR1/4-PWR2/4B&B4P(V827270)4PWR3/4-PWR4/4PSWV8272902P6P3P3P15P15P27P27P11EMX68S / EMX88S DIMENSIONS305mm481.5mm448.5mm327.6mm62mmG Front ViewG Side ViewG Front View with Rack Mount Adaptor12EMX68S / EMX88SMIX88MIX68DSPINPUT TO MAINFOOT SWCH INPUTEMX-68S CH5,6EMX-88S CH7,8CH INPUTEMX-68S CH3,4EMX-88S CH5,6CH INPUTEMX-68S CH1,2EMX-88S CH1-4EFFECTON/OFFTAPLow-ZLow-ZHi-ZSuper Hi-ZMICL/MONORL/MONORLRLINEAUX IN2TR IN12312312312341234123412341234123412341234EMX-68S:IC101EMX-88S:IC101,301EMX-68S:IC103EMX-88S:IC103,303EMX-68S/88S:IC503EMX-68S/88S:IC504EMX-68S/88S:IC102EMX-68S/88S:SW906EMX-68S/88S:IC502EMX-68S/88S:IC501EMX-68S/88S:IC704EMX-68S/88S:IC701,801EMX-68S/88S:IC702,802EMX-68S/88S:IC702,802EMX-68S/88S:IC701,801EMX-68S/88S:IC703,803EMX-68S/88S:IC703,803EMX-68S/88S:IC901EMX-68S/88S:IC901EMX-68S/88S:IC902EMX-68S/88S:IC902EMX-68S/88S:EN901EMX-68S/88S:VR905EMX-68S/88S:IC923EMX-68S/88S:IC923EMX-68S/88S:ICEMX-68S/88S:IC922EMX-68S/88S:IC922EMX-68S/88S:IC904EMX-68S/88S:IC921EMX-68S/88S:IC921EMX-68S/88S:IC903EMX-68S/88S:IC903EMEMEMEMX-68S/88S:IC920EMX-68S/88S:IC920EMX-68S/88S:IC50582921-2412-15201613232214928102718,1920,21CN101-27PINCN901-27PINCN901-27PIN657655765775731575721676721672121676721672157312167215757AA BLOCK & LEVEL DIAGRAM13EMX68S / EMX88S+PWR 1/4PWR 2/4SPEAKERSEFFECT OUTMAIN LMAIN RMONITORREC OUTBRIDGE12A12B1234123412341234EMX-68S/88S:IC923EMX-68S/88S:C923EMX-68S/88S:IC904EMX-68S/88S:IC916EMX-68S/88S:IC922EMX-68S/88S:C922EMX-68S/88S:IC904EMX-68S/88S:IC916EMX-68S/88S:IC921MX-68S/88S:C921EMX-68S/88S:IC903EMX-68S/88S:IC903EMX-68S/88S:IC914EMX-68S/88S:IC914EMX-68S/88S:IC905,906EMX-68S/88S:IC907,908EMX-68S/88S:IC909,910EMX-68S/88S:IC920MX-68S/88S:C920EMX-68S/88S:IC911EMX-68S/88S:IC917,918EMX-68S/88S:IC917,918EMX-68S/88S:IC912EMX-68S/88S:SW904EMX-68S/88S:SW905EMX-68S/88S:IC915EMX-68S/88S:IC915EMX-68S/88S:IC913CN903-15PINCN101-15PINW101RE1W101BE1W101RE2W101BE221676757572167213131216767572167213181,2,3,4,781,2,3,4,781,2,3,4,738CA1-8822109 1PAPAAA14EMX68S / EMX88S DISASSEMBLY PROCEDURE1.Front Panel Assembly(Time required: about 3 min)1-1.Remove the seven (7) screws marked 80 and thescrew marked 90. (Fig.1)1-2.Hold volume knobs and pull the front panelforward. (Fig.1)1-3.Remove the screw marked 100. The front panelassembly can then be removed. (Fig.1)2.DSP-SPX1 Circuit Board (Time required: about 4 min)2-1.Remove the front panel assembly. (See Procedure 1)2-2.Remove the two (2) screws marked 170 toremove the shield case. (Fig.2)2-3.Remove the four (4) screws marked 140. TheDSP-SPX1 circuit board can then be removed.(Fig.2)808090100Body AssemblyFront Panel AssemblyDSP170140140250270(Fig. 1)80:Bind Head Screw 4.0X12 MFZN2BL (VB132700)90:Bind Head Screw 4.0X20 MFZN2BL (VB403600)100: Bind Head Screw A4.0X8 MFZN2BL (VP156800)(Fig. 2)140: Bind Head Tapping Screw-B 3.0X6 MFZN2BL (EP600230)170: Bind Head Tapping Screw-B 3.0X6 MFZN2BL (EP600230)250: Cord Binder TS-0708 KSS (VZ765100)270: Cable Cramp AB-3S-3M NYLON66 (V9078900)15EMX68S / EMX88S3.MIX68 Circuit Board (EMX68S)(Time required: about 18 min)MIX88 Circuit Board (EMX88S)(Time required: about 20 min)3-1.Remove the front panel assembly. (See Procedure 1)3-2.Remove the cable from the cord binder marked250. (Fig.2)3-3.Remove the shield case. (See Procedure 2-2)3-4.Pull out the connector assembly from CN101 onthe DSP-SPX1 circuit board. (Fig.4)3-5.Remove the six (6) screws marked 240 to removethe shield plate. (Fig.3)3-6.EMX68S: Remove the fifteen (15) screws marked40, and the thirteen (13) screwsmarked 41, and the sixteen (16)hexagonal nuts marked A. (Fig.5)EMX88S: Remove the fifteen (15) screws marked40, and the seventeen (17) screwsmarked 41, and the eighteen (18)hexagonal nuts marked A. (Fig.5)3-7.EMX68S: Remove the eighteen (18) knobs marked50, the nine (9) knobs marked 60, thenine (9) knobs marked 70, six (6)knobs marked 80, and the nine (9)knobs marked 90. The mix68 circuitboard can then be removed. (Fig.5)EMX88S: Remove the twenty-four (24) knobsmarked 50, the eleven (11) knobsmarked 60, the eleven (11) knobsmarked 70, eight (8) knobs marked80, and the eleven (11) knobs marked90. The mix88 circuit board can thenbe removed. (Fig.5)Note: When placing the front panel assembly onthe table, take care not to weight the PWRcircuit board 4/4. (Fig.6)DSPPullPullPull(Fig. 4)240Top ViewBottom View(Fig. 3)240: Bind Head Tapping Screw-B 3.0X6 MFZN2BL (EP600230)16EMX68S / EMX88S4.PWR Circuit Board 4/4(Time required: about 4 min)4-1.Remove the front panel assembly. (See Procedure 1)4-2.Pinch slightly the stopper of the power switchescutcheon with a plyer, pull it to the front toremove. (Fig.7-1)4-3.Remove the two (2) screws marked 100. (Fig.7-2)4-4.Remove the power switch knob marked 120. ThePWR circuit board 4/4 can then be removed.(Fig.7-2)(Fig. 7-1)100: Bind Head Screw 3.0X8 MFZN2BL (VB659000)120: Power Switch Knob MX12/4 (VU859000)5070608090706080906070909050404040404040404040406070 9090EMX88SEMX68SAA41AA41414140: Screw X25 MFZNBL (V3289800)41: Bonding Tapping Screw-B 3.0X8 MFZN2BL (VN413300)50: Knob GREEN/M-GRAY (V6225300)60: Knob L-GRAY/M-GRAY (V6225600)70: Knob BLUE/M-GRAY (V6225400)8