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Yamaha MG8/2FX Service Manual

Other manuals for MG8/2FX: Owner's Manual

Summary of MG8/2FX

  • Page 1

    Service manual pa hamamatsu, japan copyright (c) yamaha corporation. All rights reserved. Pdf-k1941 m i ’04.12 011744 20050110-23000 contents （目次） specifications （総合仕様）........................................................ 3/5 dimensions （寸法図）..........................................................

  • Page 2

    2 mg8 / 2fx important 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 already known and understood by the users, and hav...

  • Page 3

    3 mg8 / 2fx specifications ■ ■ ■ ■ ■ electrical characteristics conditions min typ max unit total harmonic distortion (thd+n) 20 hz - 20 khz @+14dbu 10k ohms (mic to st out) (ch1, 2) with signal input ch level control 0.1 % and st master level control at nominal level frequency response 20 hz - 20 k...

  • Page 4

    4 mg8 / 2fx ■ ■ ■ ■ ■ input specifications input connector gain input appropriate sensitivity* nominal max. Before connector impedance impedance level clipping specifications -60 -72 dbu -60 dbu -40 dbu mic input 3kΩ 50-600Ω mic (0.195 mv) (0.775 mv) (7.75 mv) xlr-3-31 type (ch 1, 2) -16 -28 dbu -16...

  • Page 5

    5 mg8 / 2fx 総合仕様 ■ ■ ■ ■ ■ 電 気 的 特 性 電 気 的 特 性 電 気 的 特 性 電 気 的 特 性 電 気 的 特 性 条件 最小 標準 最大 単位 (thd+n) 20 hz〜 20 khz @ +14 dbu 10 k ohms 全高調波歪率(mic → st out) (ch1、2) ( 信号入力チャンネルlevel コントロール、 0.1 ％ st master コントロール= ノミナルレベル) 周波数特性(mic → st out) 20 hz 〜 20 khz @ +4 dbu 10 k ohms -3 0 1 db (gain コントロール＝最小...

  • Page 6

    6 mg8 / 2fx ■ ■ ■ ■ ■ 入 力 仕 様 入 力 仕 様 入 力 仕 様 入 力 仕 様 入 力 仕 様 ■ ■ ■ ■ ■ 出 力 仕 様 出 力 仕 様 出 力 仕 様 出 力 仕 様 出 力 仕 様 入力端子名称 ゲイン 入力イン 適合インピーダンス 感度*1 ノミナルレベル 最大ノンク 端子仕様 ピーダンス リップレベル -60 -72 dbu -60 dbu -40 dbu mic input 3 kΩ 50 〜 600 Ω マイク （0.195 mv） （0.775 mv） （7.75 mv） xlr-3-31 タイプ (ch1、2） -16 -28 dbu -1...

  • Page 7

    7 mg8 / 2fx dimensions （寸法図） unit: mm reverb hall 1 reverb hall 2 reverb room 1 reverb room 2 reverb stage 1 reverb stage 2 reverb plate drum ambience karaoke echo vocal echo chorus 1 chorus 2 flanger phaser auto wah distortion 251 290.5 65 （単位） circuit board layout （ユニットレイアウト） reverb hall 1 reverb ...

  • Page 8

    8 mg8 / 2fx panel layout （パネルレイアウト） ■ ■ ■ ■ ■ channel control section（チャンネルコントロール部） q channels 1 and 2 (monaural) channels 3/4 and 5/6 (stereo) channels 7/8 (stereo) w r t y u e t t y y u u q [gain] control w [peak] indicator e [ ] switch (high pass filter) r equalizer ([high], [mid], [low]) t [effe...

  • Page 9

    9 mg8 / 2fx ■ ■ ■ ■ ■ input/output section （入出力部） !1 !0 q w e r t y o i u q channel input jacks (chs 1, 2, 3/4, 5/6) [mic] jacks [line] jacks w [insert i/0] jacks (chs 1 and 2) e channel input jacks (ch 7/8) r [2tr in[ jacks t [rec out](l, r) jacks y [st out](l, r) jacks u [c-r out] jacks i [send] j...

  • Page 10

    10 mg8 / 2fx connector polarities mic input pin 1: ground pin 2: hot (+) pin 3: cold (-) line input (monaural channels), st out, c-r out effect * tip: hot (+) ring: cold (-) sleeve: ground tip: output ring: input sleeve: ground phones tip: l ring: r sleeve: ground return, line input (stereo channels...

  • Page 11

    11 mg8 / 2fx disassembly procedure （分解手順） 1. Bottom case(time required: about 1 minute) 1-1 remove the two (2) screws marked [260].(fig.1) 1-2 remove the five (5) screws marked [265] using a hexagonal wrench.(fig.1) note: the spacers [160] have been attached to the five (5) screws marked [265] respe...

  • Page 12

    12 mg8 / 2fx [130] dsp circuit board （dspシート） main circuit board （mainシート） cover （カバー） shield （シールド） [110] connector cnm02 （コネクターcnm02） connector cne01 （コネクターcne01） power switch and ac connector （電源スイッチとacコネクター） [263] top cover （トップカバー） [263]: bind head tapping screw-s 3.0x6 mfzn2bl (ep630210) ＋バインド...

  • Page 13

    13 mg8 / 2fx [200] [300] [180a] [180b] [190] guard （ガード） hexagonal nut & washer （六角ナット、ワッシャー） top cover （トップカバー） [180]: bonding tapping screw-b 3.0x10 mfzn2bl (vq049800) ボンディング b タイト [190]: knob white/m-glay (wa009900) ノブ level [200]: knob red/m-gray (wa010000) ノブ level [300]: knob black (wd233000) ...

  • Page 14

    14 mg8 / 2fx note: when reassembling the main circuit board and the top cover, confirm whether the heads of leds and spacers correctly come out of the corresponding holes on the top cover.(fig.9) 注）main シートとトップカバーの再組立時に､led の頭とスペーサーがパネルの穴から正しく出て いるか注意して下さい｡ （fig.9） (fig.9) 4. Power supply switch and...

  • Page 15

    15 mg8 / 2fx lsi pin description （lsi 端子機能表） pin pin no. Name i/o function no. Name i/o function 1 vss - vss 65 vss - vss 2 testn i input for test 66 iovdd - iovdd +3.3v 3 pllbpn i pll bypass select 67 lbn/lwrn/pf6 o external memory lower-byte enable 4 pllvdd - pllvdd +2.5v 68 ubn/uwrn/pf7 o externa...

  • Page 16

    16 mg8 / 2fx njm4556al (xp844a00) dual operational amplifier out a - a + a - v + v out b - b + b a b 1 2 3 4 5 6 7 8 main: ic806 njm4580m-d (x5025a00) njm4558m (x5676a00) njm2068m-d (x3505a0) dual operational amplifier main:ic101, 201, 301, 401, 801, 804 main:ic103, 304, 404, 503 main:ic202, 302, 30...

  • Page 17

    17 mg8 / 2fx circuit boards （シート基板図） contents main circuit board (x5023b0) ........................................................................................... 18-21 dsp circuit board (x5022c0) .................................................................................................. ...

  • Page 18

    18 mg8 / 2fx • main circuit board c401-c402 c301-c302 c201-c202 c101-c102 apply silicon grease to the shaded area before installing ics 01-05 and q01 on the heat sink. 放熱板に取り付ける前に斜線部にシリコン グリスを塗ること。 c101,c102,c201,c202,c301,c302,c401,c402 should fix adjacent cap electritic with adhesives. C101,c102,c...

  • Page 19

    19 mg8 / 2fx peak high mid low effect pan level peak peak peak peak pan/bal pan/bal bal on 1 2 3/4 5/6 7/8 effect rtn c-r / phones st 2tr in return phantom +48v parameter program sert /o sert /o 4r 6r 8r turn r r out r hones r l st power peak +3 0 -3 -7 -15 +5 +1 -1 -5 -10 -20 to dsp-cnm02 gain a a'...

  • Page 20

    20 mg8 / 2fx • main circuit board b b' www. Xiaoyu163. Com qq 376315150 9 9 2 8 9 4 2 9 8 tel 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 q q tel 13942296513 qq 376315150 892498299 tel 13942296513 qq 376315150 892498299 http://www.Xiaoyu163.Com http://www.Xiaoyu163.Com.

  • Page 21

    21 mg8 / 2fx pattern side （パターン側） b b' to ac adaptor in on/standby wd35000 wiring ass'y ac8 brown red black to dsp-cnm02 2na-wc28110 1 www. Xiaoyu163. Com qq 376315150 9 9 2 8 9 4 2 9 8 tel 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 q q tel 13942296513 qq 376315150 892498299 tel 13942296513 qq ...

  • Page 22

    22 mg8 / 2fx inspections 1. Power supply ac adaptor shall be used. W0703500(u,v:120v), wc711000(o:220v), wc703800(k:220v), wc703700(b:230v), wc703600(h,w:230v), wc703900(a:240v), wc703400(j:100v) 2. Power indicator and effect on led inspection power led &digital effect on led shall light when the un...

  • Page 23

    23 mg8 / 2fx 3.2 gain the output levels shall be within the range specified in the table 3.2-1 to 3.2-6. Table 3.2-1 [ch input(1, 2)] [unit: dbu] input input level gain st l out st r out send/effect c-r out l c-r out r (1) mic -72 max 0 ± 2 (*1) 0 ± 2 (*1) +5 ± 2 +16 ± 2 (*1) +16 ± 2 (*1) mic -28 mi...

  • Page 24

    24 mg8 / 2fx 3.8 meter led lighting check peak led lights up, when st output level reaches +17.5 ±2dbu. 0 led lights up, when st output level reaches +4 ±2dbu. Operate the master vr and check that led light up in order from “-20” to “peak”. 3.9 distortion factor in the signal routes of the table 3.2...

  • Page 25

    25 mg8 / 2fx at the c-r out (l/r), setting the level control to the 12 o’clock position, feeding each 20hz, 1khz and 20khz signal, the distortion shall be less than 0.2%, when the output signal level is +3dbu. *in the route (1), check every out when the signal is fed to ch1,and check only the st l o...

  • Page 26

    26 mg8 / 2fx 3.15 others 1. Digital effect(confirmation by hearing test) before testing, set the controls as shown below. Effect vr: max.(10), program: 1, effect: on, effect rtn vr: max.(10) feed a sound source at an appropriate level to ch1 and confirm whether the reverb sound is heard at the phone...

  • Page 27

    27 mg8 / 2fx 検査 1 . 1 . 1 . 1 . 1 . 電 源 電 源 電 源 電 源 電 源 ac アダプターを使用します。 *ac アダプター（100v: wc703400） 2 . 2 . 2 . 2 . 2 . パワーインジケーターと パワーインジケーターと パワーインジケーターと パワーインジケーターと パワーインジケーターと digital effect on led digital effect on led digital effect on led digital effect on led digital effect on led の 検 査 の 検 査 ...

  • Page 28

    28 mg8 / 2fx table 3.2-6 [input terminal 2tr in l,r] [ table 3.2-6 [input terminal 2tr in l,r] [ table 3.2-6 [input terminal 2tr in l,r] [ table 3.2-6 [input terminal 2tr in l,r] [ table 3.2-6 [input terminal 2tr in l,r] [単 位 単 位 単 位 単 位 単 位: dbu] : dbu] : dbu] : dbu] : dbu] input input level st l o...

  • Page 29

    29 mg8 / 2fx 3 . 3 3 . 3 3 . 3 3 . 3 3 . 3 周波数特性 周 波 数 特 性 周 波 数 特 性 周 波 数 特 性 周 波 数 特 性 table 3.2-1 〜 3.2-6 の（1）〜（12）のついた系統について、印加信号周波数を 20hz, 20khz とした時、各出 力端子の出力レベルが 1khz を基準として、＋ 1.0db, -2.5db の範囲内にあることを確認します｡ *gain vr max の時の 20hz のみ、＋ 1.0db,-4.5db とします｡ *（1）の系統は、ch.1 のみ全部の out で確認し、ch.2 以降は st...

  • Page 30

    30 mg8 / 2fx 3 . 1 3 3 . 1 3 3 . 1 3 3 . 1 3 3 . 1 3 phantom phantom phantom phantom phantom mic 入力コネクタのピン（1）-（2）間に負荷抵抗 10k Ω（1w 以上）を接続し、ピン（2）-（3）間を短絡 します｡ phantom switch を on した時、led が点灯し負荷抵抗両端に＋ 35 ± 3v の電圧が得られることを確認し ます｡ 3 . 1 4 3 . 1 4 3 . 1 4 3 . 1 4 3 . 1 4 digital effect digital effect digita...

  • Page 31

    31 mg8 / 2fx output ch1: gain vr ch1: level vr ch1: pan program select parameter effect vr switch st l out min max r 1 min st r out l table 3.14-1 [ table 3.14-1 [ table 3.14-1 [ table 3.14-1 [ table 3.14-1 [単 位 単 位 単 位 単 位 単 位:dbu] : d b u ] : d b u ] : d b u ] : d b u ] 入力信号を無くし、ch effect level co...

  • Page 32: Parts List

    Note) destination abbreviations a: australian model o: chinese model b: british model q: south-east asia model c: canadian model t: taiwan model d: german model u: u.S.A. Model e: european model v: general export model (110v) f: french model w: general export model (220v) h: north european model n,x...

  • Page 33

    2 mg8 / 2fx ■ overall assembly （総組立） 265 200 190 265 170 265 260 263 180 180 320 300 330 160 10 150 70 80 100 120 130 110 90 310 160 160 265 265 290 270 270 270 290 280 160 160 230 220 210 240 250 340 hexagon nut & washer （六角ナット,ワッシャー） accessories of phone jack （ホーンジャックの付属品） www. Xiaoyu163. Com qq 3...

  • Page 34

    Ref no. Part no. Description remarks qty rank rank: japan only ∗: new parts 部 品 名 3 mg8 / 2fx ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ 10 70 80 90 100 110 120 130 150 160 170 180 190 200 210 220 230 240 250 260 263 265 270 280 290 300 310 320 330 340 -- wc281100 -- ep630210 cb815740 wc281000 ep630210 -- ...

  • Page 35

    4 ref no. Part no. Description remarks qty rank rank: japan only ∗: new parts 部 品 名 mg8 / 2fx ■ electrical parts （電気部品） ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ 10 20 60 70 80 90 90a 90b 90c c01 c02 c03 -06 c07 c08 c09 c10 c11 c12 c13 c14 c15 c16 c17 c18 c19 c20 c21 c101 c102 c103 c104 c105 -107 c108 c109 c110 c111 c112 c...

  • Page 36

    Ref no. Part no. Description remarks qty rank rank: japan only ∗: new parts 部 品 名 5 mg8 / 2fx c144 c145 c201 c202 c203 c204 c205 -207 c208 c209 c210 c211 c212 c213 c214 c215 c216 c217 c218 c219 c220 c221 c222 c223 c224 c225 c226 c227 c228 c232 c233 c234 c235 c236 c237 -241 c242 c244 c245 c301 c302 c...

  • Page 37

    6 ref no. Part no. Description remarks qty rank rank: japan only ∗: new parts 部 品 名 mg8 / 2fx c335 c336 c337 c338 c339 c340 c341 c342 c343 c345 c346 c347 c348 c349 c350 c351 c352 c353 c354 -361 c362 c363 c364 c365 c401 c402 c403 c404 c405 -407 c408 c409 c410 c411 c412 c413 -415 c416 c417 c418 c419 c...

  • Page 38

    Ref no. Part no. Description remarks qty rank rank: japan only ∗: new parts 部 品 名 7 mg8 / 2fx c451 c452 c453 c454 -461 c462 c463 c464 c465 c501 c502 c503 -506 c507 c508 c509 c510 c511 c512 c513 c514 c515 c516 c517 c518 c519 c520 c521 c522 c523 c524 c525 c526 c527 c528 c529 c530 c531 c532 c533 c534 -...

  • Page 39

    8 ref no. Part no. Description remarks qty rank rank: japan only ∗: new parts 部 品 名 mg8 / 2fx c808 c809 c810 c811 c812 c813 c814 c815 c816 c817 c818 c819 c820 c821 c822 c823 -828 c829 c830 c831 c832 c833 c834 c835 c836 -841 c842 c843 c844 c845 c846 c847 c848 c849 c850 c851 c852 c853 c854 c855 c856 c...

  • Page 40

    Ref no. Part no. Description remarks qty rank rank: japan only ∗: new parts 部 品 名 9 mg8 / 2fx ∗ ∗ ∗ ic05 ic101 ic103 ic103 ic201 ic202 ic301 ic302 ic303 ic304 ic304 ic401 ic402 ic403 ic404 ic404 ic501 ic502 ic503 ic503 ic701 ic702 ic801 ic802 ic803 ic804 ic805 ic806 jke01 jk101 jk102 jk103 jk201 jk2...

  • Page 41

    10 ref no. Part no. Description remarks qty rank rank: japan only ∗: new parts 部 品 名 mg8 / 2fx q103 q104 q105 q106 q201 q202 q203 q204 q205 q206 q301 q302 q303 q304 q305 q306 q401 q402 q403 q404 q405 q406 q801 q802 q803 q804 qe01 r01 -03 r04 r05 r101 r102 r103 r104 r105 r106 r107 r108 r109 r110 r111...

  • Page 42

    Ref no. Part no. Description remarks qty rank rank: japan only ∗: new parts 部 品 名 11 mg8 / 2fx r141 r143 r144 r145 r146 r147 r148 r149 r150 r151 r152 r153 r155 r156 r157 r161 r162 r163 r201 r202 r203 r204 r205 r206 r207 r208 r209 r210 r211 r212 r213 r214 r215 r216 r217 r218 r219 r220 r221 r222 r223 ...

  • Page 43

    12 ref no. Part no. Description remarks qty rank rank: japan only ∗: new parts 部 品 名 mg8 / 2fx ∗ ∗ ∗ r256 r257 r301 r302 r303 r304 r305 r306 r307 r308 r309 r310 r311 r313 r314 r315 r316 r317 r318 r319 r320 r321 r322 r323 r324 r325 r326 r327 r328 r329 r330 r331 r332 r333 r334 r335 r336 r337 r338 r339...

  • Page 44

    Ref no. Part no. Description remarks qty rank rank: japan only ∗: new parts 部 品 名 13 mg8 / 2fx ∗ ∗ ∗ r380 r401 r402 r403 r404 r405 r406 r407 r408 r409 r410 r411 r413 r414 r415 r416 r417 r418 r419 r420 r421 r422 r423 r424 r425 r426 r427 r428 r429 r430 r431 r432 r433 r434 r435 r436 r437 r438 r439 r440...

  • Page 45

    14 ref no. Part no. Description remarks qty rank rank: japan only ∗: new parts 部 品 名 mg8 / 2fx r501 r502 r503 r504 r505 r506 r507 r508 r509 r510 r511 r512 r513 r514 r515 r516 r517 r518 r519 r520 r521 r522 r523 r524 r525 r526 r527 r528 r529 r530 r531 r532 r533 r534 r535 -538 r541 r542 r543 r544 r545 ...

  • Page 46

    Ref no. Part no. Description remarks qty rank rank: japan only ∗: new parts 部 品 名 15 mg8 / 2fx r816 r817 r818 r819 r820 r821 r822 r823 -826 r827 r828 r829 r830 r831 r832 r833 r834 r835 r836 r837 r838 r839 r840 -843 r844 r845 r846 r847 r848 -851 r852 -855 r856 r857 r858 r859 r860 r861 r862 r863 r865 ...

  • Page 47

    16 ref no. Part no. Description remarks qty rank rank: japan only ∗: new parts 部 品 名 mg8 / 2fx ∗ -104 vr105 vr106 vr107 vr201 vr202 -204 vr205 vr206 vr207 vr301 vr302 -304 vr305 vr306 vr307 vr401 vr402 -404 vr405 vr406 vr407 vr501 -503 vr504 vr505 vr506 vr701 vr702 vr801 vr802 vre01 vre02 zd01 zd02 ...

  • Page 48

    Ref no. Part no. Description remarks qty rank rank: japan only ∗: new parts 部 品 名 17 mg8 / 2fx cm43 cm45 cm47 cm48 cm50 cm51 cm52 cm53 cm54 cm55 cm56 cm57 cm58 cm60 cm61 cm62 cm63 cm64 cm65 cm70 cm72 cm73 cm74 cm75 cm76 cm79 cm80 cm81 cm82 -85 cnm02 cnm03 emm01 emm05 icm03 icm04 icm05 icm06 icm07 ic...

  • Page 49

    18 ref no. Part no. Description remarks qty rank rank: japan only ∗: new parts 部 品 名 mg8 / 2fx ∗ ∗ ∗ ∗ ∗ ∗ ∗ rm37 rm38 rm39 rm40 rm41 rm42 rm43 rm60 rm61 rm62 rm63 rm64 rm65 rm80 rm81 rm82 rm83 rm84 rm85 rm86 rm88 rm89 rm90 rm91 rm92 xm01 rd356100 rd356560 rd356560 rd356330 rd356330 rd357360 rd35736...

  • Page 50: Circuit Diagram

    Contents （目次） block diagram & level diagram （ブロックダイアグラム、レベルダイアグラム） .... 2 overall circuit diagram （総回路図） (ma in 1/5) ..................................................................................................................... 3 (main 2/5) .......................................................

  • Page 51

    St out [+4dbu] 1 2 3 4 5 6 7 8 9 10 11 12 b c d e f g h i j k l m n o p q a +2.5d block diagram & level diagram cpu icm07 icm03 icm10 +3.3d +3.3d 24 15,46,89,119 mask rom (8mbit) reset data address 70-76,78-86 91-103,105 108,110-114 29-36 38-45 1-10,13 16-25 37 +5d +3.3a +5a +15v +15v -15v -15v +15v...

  • Page 52

    1 2 3 4 5 6 7 8 9 10 11 12 b c d e f g h i j k l m n o p q a 28cc1-8831138 op amp op amp op amp op amp op amp op amp op amp op amp op amp op amp op amp op amp op amp op amp op amp op amp op amp op amp op amp op amp overall circuit diagram 1/6 (main 1/5) to main 2/5:a3 3/5:i8 4/5:b4 to main 2/5:a4 3/...

  • Page 53

    28cc1-8831138 4 op amp op amp op amp op amp op amp op amp op amp op amp op amp op amp overall circuit diagram 2/6 (main 2/5) to main 1/5:a1 3/5:j8 4/5:b4 to main 1/5:a2 3/5:h8 to main 1/5:a1 3/5:i8 4/5:b4 f rom main 3/5:i2 f rom main 3/5:i2 mg8/2fx （セ）: ceramic capacitor（セラミックコンデンサ） （マ）: mylar capac...

  • Page 54

    28cc1-8831138 op amp op amp op amp op amp op amp op amp op amp driver driver op amp o verall circuit dia gram 3/6 (main 3/5) from main 1/5:a1 2/5:a3 4/5:b4 from main 1/5:a1 2/5:a3 4/5:b4 from main 1/5:a2 2/5:a4 to main 4/5:f4 to main 2/5:q8 to main 2/5:p8 mg8/2fx （フ） : flame proof carbon resistor （不...

  • Page 55

    ■ overall circuit diagram 5/6 (main 5/5) mg8/2fx 28cc1-8831138 regulator regulator regulator regulator regulator ■ overall circuit diagram 4/6 (main 4/5) mg8/2fx b c d e f g h a b c d e f g h a 1 2 3 4 5 6 br bl re on foot switch 6 to main 1/5:a1, 2/5:a3, 3/5:j8 to main 1/5:a1, 2/5:a3, 3/5:i8 1 2 3 ...

  • Page 56

    1 2 3 4 5 6 7 8 9 10 11 12 7 b c d e f g h i j k l m n o p q a not install 28cc1-8831139 2 cpu mask rom dac adc regulator regulator op amp op amp reset serial i/f not install not connected for jtag to main-cne01 not connected overall circuit diagram 6/6 (dsp) （セ）: ceramic capacitor（セラミックコンデンサ） （マ）: ...