Yamaha-EMX-68-S-Service-Manual电路原理图.pdf

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1、SERVICE MANUAL HAMAMATSU, JAPAN 1,387K-7041 Printed in Japan 2002.03 PA011625 CONTENTS SPECIFICATIONS . 3 PANEL LAYOUT. 7 CIRCUIT BOARD LAYOUT & WIRING . 10 DIMENSIONS .11 BLOCK & LEVEL DIAGRAM. 12 DISASSEMBLY PROCEDURE . 14 LSI PIN DESCRIPTION . 20 IC BLOCK DIAGRAM. 22 CIRCUIT BOARDS . 23 INSPECTIO

2、N . 37 OVERALL CIRCUIT DIAGRAM PARTS LIST EMX68SEMX88S This document is printed on chlorine free (ECF) paper with soy ink. OPTION RK-88 RACK MOUNT KIT EMX68S 20020325-92000 EMX88S 20020325-105000 RK8820020325-2500 RadioFans.CN 收音机爱 好者资料库 2 EMX68S / EMX88S IMPORTANT NOTICE This manual has been provid

3、ed 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 already known and understood by the users, and have therefore not been restated. WARNING:Failure to follow

4、 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. For these reasons, we advise all Yamaha product owners that all service required should be performed by an

5、authorized 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 an

6、y form. The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research engineering, and service departments of Yamaha are continually striving to improve Yamaha products. Modifications are, therefor, inevitable and changes in specification are subject

7、 to change without notice or obligation to retrofit. Should any discrepancy appear to exist, please contact the distributors Service Division. WARNING:Static discharges can destroy expensive components. Discharge any static electricity your body may have accumulated by grounding yourself to the grou

8、nd buss in the unit (heavy gauge black wires connect to this buss). IMPORTANT:Turn the unit OFF during disassembly and parts replacement. Recheck all work before you apply power to the unit. WARNING: CHEMICAL CONTENT NOTICE! The solder used in the production of this product contains LEAD. In additio

9、n, other electrical / electronic and / or plastic (where applicable) components 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 / EL

10、ECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REASON WHAT SO EVER! Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or expose eyes to solder / flux vapor! If you come in contact with solder or components located inside the enclosure

11、 of this product, wash your hands before handling food. IMPORTANT NOTICE FOR THE UNITED KINGDOM Connecting the Plug and Cord WARNING:THIS APPARATUS MUST BE EARTHED IMPORTANT: The wires in this main lead are coloured in accor- dance with the following code: GREEN-AND-YELLOW: EARTH BLUE: NEUTRAL BROWN

12、: LIVE As the colours of the wires in the main lead of this apparatus may not correspond with the coloured markings identifying the terminals in your plug, proceed as follows: The GREEN-and-YELLOW wire must be connected to the terminal in the plug that is marked with the letter E or the safety earth

13、 symbol (or coloured GREEN or GREEN-and-YELLOW). The BLUE wire must be connected to the terminal that is marked with the letter N (or coloured BLACK). The BROWN wire must be connected to the terminal that is marked with the letter L (or coloured RED). This applies only to products distributed by Yam

14、aha Kemble Music (U. K.) Ltd. WARNING Components having special characteristics are marked and must be replaced with parts having specification equal to those originally installed. RadioFans.CN 收音机爱 好者资料库 3 EMX68S / EMX88S SPECIFICATIONS G General specifications Maximum output power MAIN L, R: 400 W

15、+400 W/4 0.5% THD at 1 kHz, 270 W+270 W/8 0.5% THD at 1 kHz MAIN BRIDGE: 800 W/8 0.5% THD at 1 kHz Frequency response 20 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 distortion Less than 0.5% 2

16、0 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,

17、 MONITOR OUT) 79 dB (MAIN OUT)Master level control: nominal level, All channel level controls: minimum 75 dB (MONITOR OUT)Master level control: nominal level, All channel level controls: minimum 69 dB (MAIN OUT)Master level control: nominal level, 1 channel level control: nominal level 84 dB (EFFECT

18、 OUT)All channel level controls: minimum 64 dB (EFFECT OUT)1 channel level control: nominal level Maximum voltage gain 86 dB CH IN (Lo-Z) to SPEAKERS OUT 66 dB CH IN (Lo-Z) to MAIN OUT, MONITOR OUT 66 dB CH IN (Lo-Z) to EFFECT OUT 48 dB CH IN (Lo-Z) to REC OUT 56 dB CH IN (Hi-Z) to MAIN OUT, MONITOR

19、 OUT 46 dB CH IN (Super Hi-Z) to MAIN OUT 26 dB AUX IN to MAIN OUT 24 dB 2TR IN to MAIN OUT 66 dB MIC IN to MAIN OUT 26 dB LINE IN to MAIN OUT Crosstalk at 1 kHz65 dB adjacent input, 65 dB input to output Input channel equalization 15 dB Maximum HIGH10 kHz shelving MID2.5 kHz peaking LOW100 Hz shelv

20、ing * Turn over/roll-off frequency of shelving: 3 dB below maximum variable level. Meters5 POINTS LED METER (MAIN OUT L/R, MONITOR OUT) Graphic equalizer 7 bands (125, 250, 500, 1k, 2k, 4k, 8k Hz) 12 dB Maximum (MAIN OUT, MONITOR OUT) Internal digital effect16 programs, parameter control, tap delay

21、control Phantom 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

22、(FC5)DIGITAL EFFECT MUTE : on/off, Tap delay Optional accessoriesRK-88, FC5 Power requirement/ Power consumption USA and Canada120 V AC 60 Hz/300W Europe230 V AC 50 Hz/350W Other240 V AC 50 Hz/350W Dimensions (WxHxD)482 x 305 x 328 mm Weight15.5 kg Supplied accessoriesAC power cord, Owners Manual 4

23、EMX68S / EMX88S All output jacks are unbalanced. 0 dB=0.775 Vrms, 0 dBV=1 Vrms. Input connectorsPAD Actual load impedance Nominal impedance Input level Connector type Sensitivity*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 u

24、nit is set at maximum gain. (All level controls are at maximum position.) Nominal level Max. before clipping CH INPUT (Low-Z) (CH14/16) OFF 3 k 50600 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

25、-Z) (CH12/14) OFF 10 k 50600 Mics52 dB (1.95 mV)40 dB (7.75 mV)10 dB (245 mV) Phone jack (TRS)*2 ON600 Lines22 dB (61.6 mV)10 dB (245 mV)+20 dB (7.75 V) CH INPUT (Super Hi-Z) (CH34/56) OFF 470 k1k 42 dB (6.16 mV)30 dB (24.5 mV)0 dB (775 mV) Phone jack*3 ON12 dB (195 mV)0 dB (775 mV)+10 dB (3.16 V) M

26、IC INPUT3 k50600 Mics62 dB (0.616 mV)50 dB (2.45 mV)20 dB (77.5 mV) XLR-3-31 type*2 LINE 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*3

27、 2TR IN (L, R)10 k600 Line22 dBV (79.4 mV)10 dBV (316 mV)+17.8 dBV (7.76 V)Phono jack Output connectors Actual source impedance Nominal impedance Output level Connector type NominalMax. before clipping SPEAKERS OUT A, B (1, 2) 0.14/8 Speaker80 W/4(400 W/4)Phone jack BRIDGE0.18 Speaker160 W/8)Phone j

28、ack MAIN OUT (L, R)60010 k Lines+4 dB (1.23 V)+20 dB (7.75 V)Phone jack EFFECT OUT60010 k Lines+4 dB (1.23 V)+20 dB (7.75 V)Phone jack MONITOR OUT60010 k Lines+4 dB (1.23 V)+20 dB (7.75 V)Phone jack REC OUT (L, R)60010 k Lines10 dBV (316 mV)+10 dBV (3.16 V)Phono jack (800 W/8 G Input specificaitons

29、G Output specificaitons 5 EMX68S / EMX88S 6 EMX68S / EMX88S 7 EMX68S / EMX88S PANEL LAYOUT ? ? ? ? ? ? ? ? ? ? G CONTROL PANEL 1. 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-

30、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 switch 8 EMX68S / EMX88S ? ? ? ? ? ? ? ? 21 22 23 24 25 ? Graphic Equalizer ? EFFECT RTN control ? AUX IN control ? 2TR IN control ? MASTER control ?

31、Peak Level Indicator MAIN MONITOR PHANTOM switch, indicator POWER AMP YAMAHA SPEAKER PROCESSING ? Graphic Equalizer ? EFFECT RTN control ? 2TR IN control ? MASTER control 21Peak Level Indicator 22PHANTOM ON/OFF switch 23LIMITER indicator 24Power Amp select switch 25ON/OFF switch 9 EMX68S / EMX88S 26

32、 27 ? ? ? ? 26 ON/OFF switch 27POWER ON/OFF switch, indicator STAND-BY POWER switch, indicator 2. INPUT/OUTPUT SECTION G 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

33、-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 socket 10 EMX68S / EMX88S CIRCUIT BOARD LAYOUT & WIRING MIX88 MIX68 PWR 3/

34、4 PWR 3/4 PWR 4/4 PWR 4/4 DSP Power Transformer PWR 2/4 PWR 1/4 PWR 2/4 MIX88 MIX68 PWR 1/4 DSP CN106 CN107 CN903 CN104 CN901 CN101 CN101 CN105 Power Transformer AC INLET DC Fan POWER ON/OFF 1 2 3 4 LocationConnector AssemblyRemarksParts No. 1MIX68/88-PWR1/424185&2426 15P L=700V842620 2MIX68/88-DSP1

35、00mm P=1.25MF12710 3PWR1/4-PWR2/4B&B4P(V827270) 4PWR3/4-PWR4/4PSWV827290 2P 6P 3P 3P 15P 15P 27P27P 11 EMX68S / EMX88S DIMENSIONS 305mm 481.5mm 448.5mm 327.6mm 62mm G Front ViewG Side View G Front View with Rack Mount Adaptor 12 EMX68S / EMX88S MIX88 MIX68 DSP INPUT TO MAIN FOOT SW CH INPUT EMX-68S

36、CH5,6 EMX-88S CH7,8 CH INPUT EMX-68S CH3,4 EMX-88S CH5,6 CH INPUT EMX-68S CH1,2 EMX-88S CH1-4 EFFECT ON/OFF TAP Low-Z Low-Z Hi-Z Super Hi-Z MIC L/MONO R L/MONO R L R LINE AUX IN 2TR IN 12 3 12 3 12 3 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 EMX-68S:IC101 EMX-88S:IC101,301 EMX-

37、68S:IC103 EMX-88S:IC103,303 EMX-68S/88S: IC503 EMX-68S/88S: IC504 EMX-68S/88S: IC102 EMX-68S/88S: SW906 EMX-68S/88S: IC502 EMX-68S/88S:IC501 EMX-68S/88S:IC704 EMX-68S/88S: IC701,801 EMX-68S/88S: IC702,802 EMX-68S/88S: IC702,802 EMX-68S/88S: IC701,801 EMX-68S/88S:IC703,803 EMX-68S/88S:IC703,803 EMX-6

38、8S/88S:IC901 EMX-68S/88S:IC901 EMX-68S/88S:IC902 EMX-68S/88S:IC902 EMX-68S/88S:EN901 EMX-68S/88S:VR905 EMX-68S/88S: IC923 EMX-68S/88S: IC923 EMX-68S/88S:IC EMX-68S/88S: IC922 EMX-68S/88S: IC922 EMX-68S/88S: IC904 EMX-68S/88S: IC921 EMX-68S/88S: IC921 EMX-68S/88S: IC903 EMX-68S/88S: IC903 EM EM EM EM

39、X-68S/88S: IC920 EMX-68S/88S: IC920 EMX-68S/88S:IC505 829 21-2412-15 2016 132322 14 928 1027 18,19 20,21 CN101-27PIN CN901-27PIN CN901-27PIN 6 5 7 6 5 5 7 6 5 7 7 57 31 57 57 2 1 6 7 6 7 2 1 6 7 2 1 2 1 6 7 6 7 2 1 6 7 2 1 57 31 21 67 21 57 57 A A BLOCK & LEVEL DIAGRAM 13 EMX68S / EMX88S + + + + PWR

40、 1/4 PWR 2/4 SPEAKERS EFFECT OUT MAIN L MAIN R MONITOR REC OUT BRIDGE 1 2 A 1 2 B 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 EMX-68S/88S: IC923 EMX-68S/88S: C923 EMX-68S/88S:IC904EMX-68S/88S:IC916 EMX-68S/88S: IC922 EMX-68S/88S: C922 EMX-68S/88S: IC904 EMX-68S/88S:IC916 EMX-68S/88S: IC921 MX-68S/88S: C921 EMX-

41、68S/88S: IC903 EMX-68S/88S: IC903 EMX-68S/88S:IC914 EMX-68S/88S:IC914 EMX-68S/88S:IC905,906 EMX-68S/88S:IC907,908 EMX-68S/88S:IC909,910 EMX-68S/88S: IC920 MX-68S/88S: C920 EMX-68S/88S:IC911 EMX-68S/88S:IC917,918 EMX-68S/88S: IC917,918 EMX-68S/88S:IC912 EMX-68S/88S:SW904 EMX-68S/88S:SW905 EMX-68S/88S

42、:IC915 EMX-68S/88S:IC915 EMX-68S/88S:IC913 CN903-15PIN CN101-15PIN W101RE1 W101BE1 W101RE2 W101BE2 2 1 6 7 6 7 5 7 5 7 2 1 6 7 2 1 3 1 3 1 2 1 6 7 6 7 5 7 2 1 6 7 2 1 3 1 8 1,2,3,4,7 8 1,2,3,4,7 8 1,2,3,4,7 38CA1-8822109 1 PA PA A A 14 EMX68S / EMX88S DISASSEMBLY PROCEDURE 1.Front Panel Assembly (Ti

43、me required: about 3 min) 1-1.Remove the seven (7) screws marked 80 and the screw marked 90. (Fig.1) 1-2.Hold volume knobs and pull the front panel forward. (Fig.1) 1-3.Remove the screw marked 100. The front panel assembly can then be removed. (Fig.1) 2.DSP-SPX1 Circuit Board (Time required: about 4

44、 min) 2-1.Remove the front panel assembly. (See Procedure 1) 2-2.Remove the two (2) screws marked 170 to remove the shield case. (Fig.2) 2-3.Remove the four (4) screws marked 140. The DSP-SPX1 circuit board can then be removed. (Fig.2) 80 80 90 100 Body Assembly Front Panel Assembly DSP 170140 140 2

45、50270 (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 KS

46、S (VZ765100) 270: Cable Cramp AB-3S-3M NYLON66 (V9078900) 15 EMX68S / EMX88S 3.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 marked

47、 250. (Fig.2) 3-3.Remove the shield case. (See Procedure 2-2) 3-4.Pull out the connector assembly from CN101 on the DSP-SPX1 circuit board. (Fig.4) 3-5.Remove the six (6) screws marked 240 to remove the shield plate. (Fig.3) 3-6.EMX68S: Remove the fifteen (15) screws marked 40, and the thirteen (13) screws marked 41, and the sixteen (16) hexagonal nuts marked A. (Fig.5)