Yamaha EMX 860ST Service Manual 电路图.pdf

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1、SERVICE MANUAL PA 011457 19990220-99800 1.96K-296 Printed in Japan 99.03 HAMAMATSU, JAPAN CONTENTS SPECIFICATIONS. 3/4 PANEL LAYOUT. 5 CIRCUIT BOARD LAYOUT. 7 BLOCK DIAGRAM. 8 DISASSEMBLY PROCEDURE. 9 LSI PIN DESCRIPTION. 11 IC BLOCK DIAGRAM. 11 CIRCUIT BOARDS. 12 INSPECTION. 15 MIDI INPLEMENTATION

2、CHART. 25 PARTS LIST RadioFans.CN 收音机爱 好者资料库 EMX860ST 2 IMPOR TANT NOTICE This 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 alrea

3、dy known and under- stood 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 per- sonal injury, destruction of expensive components and failure of the product to perform as specified. For

4、these reasons, we advise all Yamaha product owners that all service required should be performed by an 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 certifi- cation,

5、recognition of any applicable technical capabilities, or establish a principal-agent relationship of any form. The data provided is belived 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 imp

6、rove Yamaha products. Modifications are, therefore, inevitable and changes in specification are subject 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 compo

7、nents. Discharge any static electricity your body may have accumulated 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 parts replacement. Recheck all work before you apply power to the unit. WARN

8、ING: CHEMICAL CONTENT NOTICE! The solder used in the production of this product contains LEAD. In addition, 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

9、 cause cancer and/or birth defects or other reproductive harm. DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC 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 s

10、older/flux vapor! If you come in contact with solder or components located inside the enclosure of this product, wash your hands before handling food. WARNING Components having special characteristics are marked and must be replaced with parts having specification equal to those originally installed

11、. LITHIUM BA TTERY HANDLING This product uses a lithium battery for memory back-up. WARNING :Lithium batteries are dangerous because they can be exploded by improper handling. Observe the following pre- cautions when handling or replacing lithium batteries. Leave lithium battery replacement to quali

12、fied service personnel. Always replace with batteries of the same type. When installing on the PC board by soldering, solder using the connection terminals provided on the battery cells. Never solder directly to the cells. Perform the soldering as quickly as possible. Never reverse the battery polar

13、ities when installing. Do not short the batteries. Do not attempt to recharge these batteries. Do not disasemble the batteries. Never heat batteries or throw them into fire. ADVARSEL! Lithiumbatteri-Eksplosionsfare ved fejlagtig handtering. Udskiftning ma kun ske med batteri af samme fabrikat og typ

14、e. lever det brugte batteri tilbage til leverandren. VARNING Explosionsfara vid felaktigt batteribyte. Anvand samma batterityp eller en ekvivalent typ som rekommenderas av apparattillverkaren. Kassera anvant batteri enligt fabrikantens instruktion. VAROITUS Paristo voi rajahtaa, jos se on virheellis

15、esti asennettu. Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiiin. Havita kaytetty paristo valmistajan ohjeiden mukaisesti. The following information complies with Dutch official Gazette 1995. 45; ESSENTIALS OF ORDER ON THE COLLECTION OF BATTERIES. Please refer to the diassembly pr

16、ocedure for the removal of Back-up Battery. Leest u voor het verwijderen van de backup batterij deze beschrijving. 2 RadioFans.CN 收音机爱 好者资料库 CH INPUT (Lo-Z)OFF3 k50600 Mics62 dB (616 V)50 dB (2.45 mV)20 dB (77.5 mV)XLR-3-31 (CH16)ON600 Lines32 dB (19.5 mV)20 dB (77.5 mV)+10 dB (2.45 V)type CH INPUT

17、(Hi-Z)OFF10 k50600 Mics 52 dB (1.95 mV)40 dB (7.75 mV)10 dB (245 mV)Phone jack (CH16)ON600 Lines22 dB (61.6 mV)10 dB (245 mV)+20 dB (7.75 V)(TRS)*2 MIC INPUT (CH7, 8)3 k50600 Mics62 dB (616 V)50 dB (2.45 mV)20 dB (77.5 mV)XLR-3-31 type*2 LINE INPUT (CH7, 8) (L, R)10 k600 Line22 dB (61.6 mV)10 dB (24

18、5 mV)+20 dB (7.75 V)Phone jack TAPE IN (L, R)10 k600 Line22 dBV (79.4 mV)10 dBV (316 mV)+17.8 dBV (7 V)Phono jack AUX IN (L, R)10 k600 Line22 dB (61.6 mV)10 dB (245 mV)+20 dB (7.75 V)Phone jack*3 MAIN STEREO: 135 W+135 W/8 0.5% THD at kHz, 200 W+200 W/4 0.5% THD at 1 kHz MAIN BRIDGE: 400 W/8 0.5% TH

19、D at 1 kHz MONITOR: 135 W/8 0.5% THD at 1 kHz, 200 W/4 0.5% THD at 1 kHz 20 Hz20 kHz +1 dB, 3 dB 1 W output into 8 (POWER AMP OUT) 20 Hz20 kHz +1 dB, 3 dB +4 dB output into 10 k (MAIN OUT, MONITOR OUT, EFFECT OUT) Less than 0.5% 20 Hz20 kHz, 100 W output into 4 (POWER AMP OUT) Less than 0.3% 20 Hz20

20、 kHz, +14 dB output into 10 k (MAIN OUT, MONITOR OUT, EFFECT OUT) 125 dB equivalent input noise, 68 dB residual output noise (POWER AMP OUT) 95 dB residual output noise (MAIN OUT, MONITOR OUT, EFFECT OUT) 80 dB (MAIN OUT)Master level control: nominal level, All channel level controls: minimum 75 dB

21、(MONITOR OUT)Master level control: nominal level, All channel level controls: minimum 71 dB (MAIN OUT)Master level control: nominal level, 1 channel level control: nominal level 84 dB (EFFECT OUT)Master level control: nominal level, All channel level controls: minimum 64 dB (EFFECT OUT)Master level

22、control: nominal level, 1 channel level control: nominal level 86 dB CH IN (Lo-Z) to POWER AMP OUT (CH16) 66 dB CH IN (Lo-Z) to MAIN OUT, MONITOR OUT (CH16) 72 dB CH IN (Lo-Z) to EFFECT OUT (CH16) 48 dB CH IN (Lo-Z) to REC OUT (CH16) 56 dB CH IN (Hi-Z) to MAIN OUT, MONITOR OUT (CH16) 26 dB AUX IN to

23、 MAIN OUT 24 dB TAPE IN to MAIN OUT 66 dB MIC IN to MAIN OUT (CH78) 26 dB LINE IN to MAIN OUT (CH78) 65 dB adjacent input, 65 dB input to output 15 dB Maximum HIGH10 kHz shelving MID2.5 kHz peaking LOW100 Hz shelving *Turn over/roll-off frequency of shelving: 3 dB below maximum variable level. 5 POI

24、NTS LED METER (MAIN OUT L/R, MONITOR OUT) 7 bands (125, 250, 500, 1k, 2k, 4k, 8k Hz) 12 dB Maximum (MAIN OUT, MONITOR OUT) 3 types (Vocal, L Hall, S Hall) +48 V is supplied to electrically balanced inputs for powering condenser microphones via 6.8 k current limiting/isolation resisters. Comp. : THD

25、0.5% (MAIN, MONITOR) Turns on. : THD 0.5% (MAIN, MONITOR) DIGITAL EFFECT MUTE : on/off FC5 Foot switch USA and Canada120 V AC 60 Hz Europe230 V AC 50 Hz Other240 V AC 50 Hz 300 W 497x324x275 mm 17 kg Maximum output power Frequency response Total harmonic distortion Hum for example, there should be n

26、o oscillation. Especially, do not oscillate if the FREQ LEVEL is at maximum. EMX860ST 18 3.Power Amplifier Part 3-1Setting Conditions Setting conditions are as follows unless otherwise specified. Input Terminal:INPUT CH 8 LINE L POWER AMP switch:STEREO Measuring Output Terminal:(SPEAKERS) L-A, R-A,

27、MONITOR-A Output Load:4 ohm (more than 200 W) Connect the resistor when inspecting the power amplifier section INPUT CH 1- CH 7 MONITOR level control:Minimum EFFECT level control:Minimum LEVEL level control:Minimum Note: Other control settings are the same as the mixer part in section 2-3. 3-2Power

28、ON Muting The muting relay should be released 2.5 +/- 1 seconds after the power switch is turned on. 3-3Speaker Terminal DC Voltage When input terminals are grounded, confirm that each output terminal voltage is 0 +/- 100 mV. 3-4Gain When applying a 1 kHz -26.0 dBs sine wave to an INPUT terminal, co

29、nfirm that the SPEAKERS L+R terminal output levels are +17.0 dBs and the SPEAKERS MONITOR terminal output levels is +23.0 dB dBs. The SPEAKERS L-B, R-B and MONITOR B output terminals should also be measured. 3-5Frequency Response Apply a 20 Hz, 1 kHz and 20 kHz = 26 dB sine wave signal separately to

30、 the input; the output level should be between -3 and +1 dB at 20 Hz and 20 kHz, when 1 kHz is set as the reference. (0 dB) 3-6Harmonic Distortion Apply a 1 kHz sine wave signal to the input; the three output levels should be 200 W/4 ohms (31.2 dBs/ch); the distortion ratio should be less than 0.5 %

31、. Apply a sine wave signal of 20 Hz, 1 kHz and 20 kHz separately to the input; the three output level should be 100 W /4 ohms (28.2 dBs/ch); the distortion ratio should be less than 0.5 %. Do this inspection within 30 seconds. 3-7Residual Noise Set the MASTER level controls (MONITOR and MAIN) at min

32、imum; the residual noise should be less than -68 dBs. Notes: Apply a DIN-AUDIO filter. 3-8Stability Apply a 10 kHz -26 dBs rectangular signal to the input and connect a capacitor (10 pF to 0.47 F) parallel to the 4 ohm load resistor, or connect an inductor (10 H to 0.47 H) serial to the 4 ohm load r

33、esistor. Confirm that the output signal is as illustrated below. Overshoot:Vp/Vo = 1.8 Ringing:5 waves and less than 5 waves Vp Vo Next, only connect a capacitor (10 pF to 0.47F) to the SPEAKERS terminal as a load, and confirm that the output is as follows: Overshoot:Vp/Vo = 2.5 Ringing:It should en

34、d within 7 waves; there is no oscillation. +2.5 2.0 +2.5 2.0 EMX860ST 19 3-9Protection Apply a 10 Hz sine wave signal to the input; increase the input signal so that the output signal is clipped. Confirm that the protection does not operate and that the speaker relay does not be open. When applying

35、a 1 Hz, 6 Vp-p (8.7 dBs) sine wave signal to the input, confirm that the protection operates within 2 seconds and that the speaker relay is turned off. When turning off the input signal, confirm that the protection stops the operation seconds and that the speaker relay automatically turns on within

36、5 seconds. 3-10 PC Limiter and Limiter Apply a 1 kHz -20 dBs sine wave signal to the input and then connect a 1 ohm ( +/- 5% 100 W) resistor; confirm that the output signal is Vp-p = 20V and that the signal is not rectangular. 3-11 LIMITER Indicator When applying a 1 kHz -10.8 dBs sine wave signal t

37、o the input, the LIMITER indicator should light up. 3-12 Efficiency When adjusting for the output of L and R to become 10V (+2.2 dBs), confirm that the power consumption is 330 +/- 50W. 4.Main Bridge 4-1Setting Conditions Input Terminal:INPUT CH 8 LINE L POWER AMP switch:BRIDGE Measuring Output Term

38、inal:SPEAKERS, L + R BRIDGE Output Load:8 ohm (more than 400 W) INPUT CH 1- CH 7 MONITOR level control:Minimum EFFECT level control:Minimum LEVEL level control:Minimum Note: Other control settings are the same as the mixer part in section 2-3. 4-2Connection TipMeasuring instruments input 4 ohm Phone

39、 PlugMeasuring instruments ground 4 ohm Sleeve 4-3Gain Apply a 1 kHz -26.0 dBs sine wave signal to the input; confirm that the output levels are +20.0 dBs dB. 4-4Frequency Response Apply a sine wave signal to the input; the output level should be between -3 and +1 dB at 20 Hz and 20 kHz, when 1 kHz

40、is set as the reference. (0 dB) 5.Power Supply Fluctuation There should be no operational problems when the power supply fluctuation is within +/- 10% of the nominal voltage. +2.5 2.0 EMX860ST 20 EMX860ST 21 EMX860ST 22 EMX860ST 23 EMX860ST 24 PARTS LIST CONTENTS OVERALL ASSEMBLY. 2 ELECTRICAL PARTS

41、. 4 WARNING Components having special characteristics are marked and must be replaced with parts having specification equal to those originally installed. J: Japanese model U: U.S.A. model C: Canadian model X: General export model M : South African model H: North European model V: Generol export mod

42、el (110V) A: Australian model E: European model D: German model B: British model I: Indonesian model O : Chinese model H: Generol export model (220V) Notes : DESTINATION ABBREVIATIONS The numbers “QTY” show quantities for each unit. The parts with “-” in “PART NO.” are not available as spare parts.

43、This mark “ ” in the REMARKS column means these parts are interchangeable. EMX860ST 2 OVERALL ASSEMBLY R40 R30a R50 R80 R80 R60 R20 R60 R120 R30c R30b R200 R170 R190 R210 R210 R140 R130 R100 R110 R150R90 B10 B20 B110 B120 B90 B100 B110 B120 B50 B60 B40 B80 B70 P30 P40 P10 P50 P70 P60 P90 P80 P120 P6

44、0 P70 P90 P120 P20 P150 P130 P140 P100 P110 40 60 10 70 30 20 80 90 100 50 R10 3 : New Parts REF NO.PART NO.DESCRIPTIONREMARKSQTYRANK RANK : Japan only EMX860ST * * * * * * * * * * * * * * * * : New Parts REF NO.PART NO.DESCRIPTIONREMARKSQTYRANK RANK : Japan only OVERALL ASSEMBLYEMX860ST Overall Ass

45、embly JJ(V290650) Overall Assembly U VU,V(V290660) Overall Assembly H WH,W(V290670) Overall Assembly BB(V290680) Overall Assembly AA(V290690) 10Body Assembly 20Panel Assembly(V295300) 30Bonding B-Tyte Screw4.0X8 MFZN2BL601 40Rear Assembly JJ(V295310) 40Rear Assembly UU,V(V295320) 40Rear Assembly HH,

46、W(V295330) 40Rear Assembly BB(V295340) 40Rear Assembly AA(V295350) 50Bonding B-Tyte Screw4.0X8 MFZN2BL601 60Power Transformer EJ 60Power TransformerUL CSAU,V 60Power TransformerCEH,W,B 60Power TransformerASA 70Bind Head ScrewSP 5.0X10 MFZN2BL401 80Cord HolderCV-100301 90Ferrite CoreHF57T25X12X1503 1

47、00Connector Assembly2426&2426 15P 500L(V297030) Body Assembly B10Body(V291470) B20CarpetC948(V297020) B30Shield Sheet(VV43470)2 B40Side PlateLELT(V291490) B50Side PlateRIGHT(V291480) B60Bind Head Screw4.0X18 MFZN2BL1101 B70Handle U04 B80Oval Head Screw5.0X35 MFZN2BL201 B90Corner Protector803 B100Tru

48、ss Head Tapping Screw-14.0X12 MFZN2BL16 B110Foot801 B120Truss Head Tapping Screw-14.0X20 MFZN2BL801 Panel Assembly(V295300) P10Front Panel P20Circuit BoardMIX P30PCB SupportNEW NIFCO14 P40Hexagonal Socket Screw-P3X25 MFZNBL14 P50KnobMX-GREEN/D-GRAY1-8ch(HIGH,MID,LOW)2401 P60KnobN-GRAY/D-GRAY1-8ch(MONI),TAPE IN1101 MONITOR(MAS