1. DL manuals
  2. Yamaha
  3. Music Mixer
  4. MG12/4
  5. Service Manual

Yamaha MG12/4 Service Manual

Other manuals for MG12/4: Owner's Manual, Owner's Manual

Summary of MG12/4

  • Page 1

    Service manual ■ contents specifications ......................................................... 3/5 dimensions ..................................................................... 7 panel layout ................................................. 8 mg12/4 circuit board layout & wiring ...............

  • Page 2

    2 mg12/4 mg16/4 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...

  • Page 3: Specifications

    3 mg12/4 mg16/4 ■ specifications general specifications where 0 dbu = 0.775 v and 0 dbv = 1 v 1 measured with 12.7 khz, –6 db/oct. Low pass filter (equivalent to 20 khz, – ∞ filter). (ch mic input to st, group out/aux, effect send) 2 turning pan/bal to left or right. 3 shelving turnover/rolloff freq...

  • Page 4

    4 mg12/4 mg16/4 input specifications where 0 dbu = 0.775 v and 0 dbv= 1 v * input sensitivity: the lowest level that will produce the nominal output level when the unit is set to maximum gain. Output specifications where 0 dbu = 0.775 v and 0 dbv= 1 v input connector gain input impedance appropriate...

  • Page 5

    5 mg12/4 mg16/4 ■ 総合仕様 ■ 一般仕様 ＊ 0 dbu=0.775 v 、 0 dbv=1 v とする *1 @12.7 khz, –6 db/oct. のローパスフィルターにて測定 （ @20 khz, – ∞ db/oct. フィルターに相当） （ ch mic input to st, group out/aux, effect send ） *2 pan/bal 左か右へ回す *3 シェルビングタイプのターンオーバー / ロールオフ周波数：最大可変幅に対し 3 db 下がったポイント 周波数特性（st out） 20 hz 〜 20 khz +1 db, –3 db...

  • Page 6

    6 mg12/4 mg16/4 ■ 入力仕様 ＊ 0 dbu=0.775 v 、 0 dbv=1 v とする *1 入力感度：最大ゲイン測定時に定格出力が得られる最小レベル ■ 出力仕様 ＊ 0 dbu=0.775 v 、 0 dbv=1 v とする 入力端子名称 ゲイン 入力イン ピーダンス 適合インピーダンス 感度 *1 規定レベル 最大ノンク リップレベル 端子仕様 mic input (mg16/4 ： ch1 〜 8 ） (mg12/4 ： ch1 〜 4 ） –60 3 k Ω 50 〜 600 Ω マイク –80 dbu （ 0.078 mv ） –60 dbu （ 0.775 ...

  • Page 7: Dimensions

    7 mg12/4 mg16/4 ■ dimensions ■ mg16/4 ■ mg12/4 393 31.5 309.6 d 416.6 h 108 101.3 3 w 423 428 27.5 480 when mounted on rack 317.4 d 416.6 325.6 102.6 2 h 108 w 322 480 322 when mounted on rack units : mm （寸法図） （ラック取り付け時） （ラック取り付け時） （単位）.

  • Page 8: Panel Layout

    8 mg12/4 mg16/4 q [gain] control w [peak] indicator e [ 80 ] switch (high pass filter) r equalizer ([high], [mid], [low]) t [aux1] and [aux2] controls y [pre] switch u [pan] control (mg16/4: chs 1 to 8. Mg12/ 4: chs 1 to 4) [pan/bal] control (mg16/4: chs 9/10 and 11/12. Mg12/4: chs 5/6 and 7/8) [bal...

  • Page 9

    9 mg12/4 mg16/4 q [st] master fader w [group 1-2] fader e [ to st ] switch r master send ([aux1] and [aux2] controls) t return ([aux1], [aux2], and [st] controls) y [2tr in] control u [phantom +48v] switch i level-meter signal switches (st-group toggle switch and 2tr in switch) o [c-r/phones] contro...

  • Page 10

    10 mg12/4 mg16/4 q channel input jacks [mic] jacks (mg16/4: chs 1 to 8, 9/10, 11/12. Mg12/4: chs 1 to 4, 5/6, 7/8) [line] jacks (mg16/4: chs 1 to 8. Mg12/4: chs 1 to 4) w [insert i/o] jacks (mg16/4: chs 1 to 8. Mg12/4: chs 1 to 4) e channel input jacks phone type (mg16/4: chs 9/10 to 15/16. Mg12/4: ...

  • Page 11

    11 mg12/4 mg16/4 connector polarities * these jacks will also accept connection to monaural phone plugs. If you use monaural plugs, the connection will be unbalanced. Mic input, st out pin 1: ground pin 2: hot (+) pin 3: cold (–) line input (monaural channels), group out, st out, c-r out aux1, aux2 ...

  • Page 12

    12 mg12/4 mg16/4 shrink tube (seven places) （熱収縮チューブ：7箇所） red アカ brown チャ black クロ wa595400 we735800 ■ mg12/4 circuit board layout & wiring ps ● power switch and ac connector wiring main jack 1/2 jack 1/2 jack 2/2 （mg12/4 ユニットレイアウト＆結線図） （電源スイッチとacコネクタの結線）.

  • Page 13

    13 mg12/4 mg16/4 wc703300 (7 places) cn571 (jack 1/2 circuit board) --- cn501 (main circuit board) cn771 (jack 1/2 circuit board) --- cn701 (main circuit board) cn971 (jack 1/2 circuit board) --- cn901 (main circuit board) cna71 (jack 1/2 circuit board) --- cna01 (main circuit board) cnd71 (jack 1/2...

  • Page 14

    14 mg12/4 mg16/4 shrink tube (seven places) （熱収縮チューブ：7箇所） red アカ brown チャ black クロ wa595400 we735800 ■ mg16/4 circuit board layout & wiring ps main ● power switch and ac connector wiring jack 1/2 jack 2/2 jack 1/2 （mg16/4 ユニットレイアウト＆結線図） （電源スイッチとacコネクタの結線）.

  • Page 15

    15 mg12/4 mg16/4 we735800 wd361600 cn02 ps circuit board we522200 cn01 wc703300 (9 places) cn171 (jack 1/2 circuit board) --- cn101 (main circuit board) cn371 (jack 1/2 circuit board) --- cn301 (main circuit board) cn571 (jack 1/2 circuit board) --- cn501 (main circuit board) cn771 (jack 1/2 circuit...

  • Page 16: Mg12/4 Disassembly Procedure

    16 mg12/4 mg16/4 2. Bottom cover (time required : about 3 min.) 2-1. Remove the rack mount angle l and r. (see procedure 1) 2-2. Remove the eight (8) screws marked [500]. The bottom cover can then be removed. (fig. 1) 1. Rack mount angle (time required : about 1 min.) 1-1. Remove the two (2) screws ...

  • Page 17

    17 mg12/4 mg16/4 3. Ps circuit board (time required : about 4 min.) 3-1. Remove the rack mount angle l and r. (see procedure 1) 3-2. Remove the bottom cover. (see procedure 2) 3-3. Remove the two (2) screws marked [480]. The ps circuit board and heat sink can then be removed. (fig. 2) * replacing an...

  • Page 18

    18 mg12/4 mg16/4 side cover r side cover l [440b] [440b] [440b] [480] [480] [440a] [440a] [440a] [450b] [450b] [450a] [450a] [450c] [450c] [430b] [430b] [430d] [430d] [460] [460] fader knobs hexagonal nuts hexagonal nuts [430c] [430a] ps ps (fig. 2) [430]: bind head tapping screw-s 3.0 x 6 mfzn2b3 (...

  • Page 19

    19 mg12/4 mg16/4 (photo 1) [420]: bind head tapping screw-s 3.0 x 6 mfzn2w3 (we877900) (fig. 3) push hpf buttons hooks push hpf buttons push hpf buttons push on buttons push pfl buttons push pfl buttons sleeve on buttons [420] [420] [420] hexagonal nuts mix1 support (upper) mix1 support (lower) mix2...

  • Page 20

    20 mg12/4 mg16/4 hexagonal nut and flat washer （六角ナットと平ワッシャー） claw （ツメ） ac connector （acコネクター） power switch （電源スイッチ） 6. Power switch and ac connector (time required : about 6 minutes each.) 6-1. Remove the rack mount angle l and r. (see procedure 1) 6-2. Remove the bottom cover. (see procedure 2) 6-...

  • Page 21: Mg16/4 Disassembly Procedure

    21 mg12/4 mg16/4 3. Psシート （所要時間：約4分） 3-1. ボトムカバーを外します。 (2項参照) 3-2. [480]のネジ2本と[490]のネジ1本を外し、 psシートを 外します。 (図1) 3-4. Psシートから[470]のネジ1本と六角スぺーサー1個を 外します。 (図1-1) ※ psシート上の部品を交換する場合に、ヒートシンクを取り 外す必要もあります。 以下の手順でヒートシンクを取り外し てください。 3-5. Ic01、ic05を止めている[a]のネジ2本を外します。 (写真1) 3. Ps circuit board (time required ...

  • Page 22

    22 mg12/4 mg16/4 4. Side cover (time required : about 5 minutes each.) 4-1. Remove the bottom cover. (see procedure 2) 4-2. Side cover l : 4-2-1. Remove the rack mount angle l. (see procedure 1) 4-2-2. Remove the screw marked [430a], three (3) screws marked [430b], three (3) screws marked [440a] and...

  • Page 23

    23 mg12/4 mg16/4 (fig. 2) [430]: bind head tapping screw-s 3.0 x 6 mfzn2b3 (we877800) [440]: bind head tapping screw-s 3.0 x 6 mfzn2w3 (we877900) [450]: hex. Socket set screw-s 3.0 x 6 mfzn2b3 (wf419300) [460]: bonding tapping screw-b 3.0 x 10 mfzn2b3 (we878000) side cover r side cover l [440b] [440...

  • Page 24

    24 mg12/4 mg16/4 [420] [420] [420] [420] [420] push hpf buttons hooks hexagonal nuts mix1 support (upper) mix1 support (lower) push pfl buttons meter cover push hpf buttons （ボタンon ass y） push hpf buttons mix2 support sleeve on buttons push pfl buttons [420]: bind head tapping screw-s 3.0 x 6 mfzn2w3...

  • Page 25

    25 mg12/4 mg16/4 6. Power switch and ac connector (time required : about 6 minutes each.) 6-1. Remove the rack mount angle l and r. (see procedure 1) 6-2. Remove the bottom cover. (see procedure 2) 6-3. Remove the ps circuit board. (see procedure 3) 6-4. Remove the side cover r. (see procedure 4) 6-...

  • Page 26: Ic Block Diagram

    26 mg12/4 mg16/4 ■ ic block diagram njm2068m-d(te2) (x3505a00) dual operational amplifier mg12/4 main, mg16/4 main: ic502, 503, ic702, 703, 902-904, ica02-04, icb01-03, icc01-03, icd01-03, ice01, 03, icf01, icg01-05 mg16/4 main: ic102, 103, 302, 303 njm4556al (xp844a00) dual operational amplifier mg...

  • Page 27: Circuit Boards

    27 mg12/4 mg16/4 to main-cnf01 to power switch, ac connector : not installed ■ circuit boards mg12/4 main (x6346c0) ................................. 34/36 mg12/4 jack 1/2 (x6353b0) ............................... 38 mg12/4 jack 2/2 (x6353b0) ............................... 37 mg16/4 main (x6345c0) ...

  • Page 28

    28 mg12/4 mg16/4 gain hpf high mid low aux1 pre aux2 pan st pfl 1-2 1 2 3 4 5 6 7 8 9/10 11/12 pan/bal pan/ba peak peak peak peak peak peak peak peak peak peak to jack 1/2-cn171 to jack 1/2-cn371 to jack 1/2-cn571 to jack 1/2-cn771 to jack 1/2-cn971 to j a a' ● mg16/4 main circuit board main: 2na-we...

  • Page 29

    29 mg12/4 mg16/4 0 11/12 13/14 15/16 bal pan/bal bal bal st st c-r/phones aux2 aux1 aux2 to st st/ group aux1 st group 1-2 phantom +48v 2tr in return send 2tr in peak +5 +3 +1 0 -1 -3 -5 -7 -10 -15 -20 l st r 1 2 power peak 2-cn971 to jack 1/2-cna71 to jack 1/2-cnd71 to jack 1/2-cne71 to jack 1/2-cn...

  • Page 30

    30 mg12/4 mg16/4 ● mg16/4 main circuit board b b' main: 2na-we52160

  • Page 31

    31 mg12/4 mg16/4 pattern side b b' main: 2na-we52160 （パターン側）.

  • Page 32

    32 mg12/4 mg16/4 ● mg16/4 jack 1/2 circuit board component side mic line insert i/o to main-cn101 to main-cn301 to main-cn501 to main-cn701 to main-cn901 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 9 1 9(l) 10(r) 11( 12(r c c' 01 to main-cna01 to main-cnd01 to main-cne01 to main-cng01 11 ) 11(l)...

  • Page 33

    33 mg12/4 mg16/4 to main-cnh01 phones ● mg16/4 jack 1/2 circuit board component side pattern side pattern side ● mg16/4 jack 2/2 circuit board d d' d d' jack 1/2, 2/2: 2na-we57310 （パターン側） （パターン側） （部品側）.

  • Page 34

    34 mg12/4 mg16/4 ● mg12/4 main circuit board gain hpf high mid low aux1 pre aux2 pan st pfl 1-2 1 2 3 4 to jack 1/2-cn571 to jack 1/2-cn771 to jack 1/2-cn971 to jack 1/2-cna71 to jack 1/2-cnd71 to jack 1/2-cn st st aux2 aux1 grou phantom +48v 2tr in return s 5/6 7/8 9/10 11/12 pan/bal pan/bal bal ba...

  • Page 35

    35 mg12/4 mg16/4 component side ack 1/2-cnd71 to jack 1/2-cne71 to jack 1/2-cng71 to ps-cn02 to jack 2/2-cnh02 st st c-r/phones aux2 aux1 aux2 to st st/ group aux1 st group 1-2 phantom +48v 2tr in return send 2tr in peak +5 +3 +1 0 -1 -3 -5 -7 -10 -15 -20 l st r 1 2 power 11/12 bal e e' main: 2na-we...

  • Page 36

    36 mg12/4 mg16/4 ● mg12/4 main circuit board f f' main: 2na-we52150

  • Page 37

    37 mg12/4 mg16/4 to main-cnh01 phones component side pattern side pattern side ● mg12/4 jack 2/2 circuit board f f' jack 2/2: 2na-we67570 main: 2na-we52150 （パターン側） （部品側） （パターン側）.

  • Page 38

    38 mg12/4 mg16/4 mic line inser t i/o 1 23 4 1 23 4 12 3 4 to main-cn901 to main-cna01 to main-cnd01 to main-cne01 to main-cng01 57 5(l) 6(r) 7(l) 8(r) 9(l) 10(r) 11(l) 12(r) l return send c-r out r l r l r l r a ux1 a ux2 st out gr oup out rec out 2tr in 1 2 r r l l 12(r) 10(r) 11(l) 9(l) to main-c...

  • Page 39: Inspections

    39 mg12/4 mg16/4 ■ inspections scope this inspection specifications is applied to the mixer mg12/4 and mg16/4. 1. Measurement conditions 1-1. Environment normal temperature (10 to 35 ° c) mormal humidity (45 to 85%) 1-2. Power source the voltage is within +/- 10%. Ac adaptor (pa-20) shall be used. W...

  • Page 40

    40 mg12/4 mg16/4 2-6. Gain the output levels shall be within the range specified in the table 2-6-1 - 2-6-6. In the input ch column, alphanumeric figures in front represent mg 12/4 and those in the parentheses represent mg 16/4. Table 2-6-1 ch input(1-4/8) [dbu ] input input gain st l out st r out g...

  • Page 41

    41 mg12/4 mg16/4 2-7. Frequency characteristics in the signal routes of the table 2-6-1 to 2-6-6 indicated with q to !0, the 20hz and 20khz frequency response of each output shall be within the range of 0 db +1/-2.5 db compared to the 1khz (0db). * the 20hz level when the gain volume is max shall be...

  • Page 42

    42 mg12/4 mg16/4 2-12. 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 fader and check that led light up in order from “-20” to “peak”. 2-13. Distortion factor in the signal routes of the...

  • Page 43

    43 mg12/4 mg16/4 2-17 phantom connect a 10k Ω load resistance between the pin 1 and 2 of the mic and short-circuit between the pin 2 and 3. Turn on the phantom switch(led shall light) and the voltage between pin 1 and 2 shall be within +35 +/- 3v. Table 2-16-1 [dbu ] fader/vr stereo out group out au...

  • Page 44

    44 mg12/4 mg16/4 ■ 検査 適用範囲 ミキサーmg12/4 、 mg16/4 について規定します。 1. 測定条件 1-1. 環境 常温 （10〜35℃） 常温 （45〜85%） 1-2. 電源電圧 電源電圧の±10%以内。 ac アダプター （pa-20） を使用します。 wc704000 （j:100v 50hz） 2. 電気的特性 2-1. 準備 各出力端子の負荷抵抗は下記の通りです。 ・ phones(l, r): 40Ω ・ st out(xlr): 600Ω ・ その他出力 : 10kΩ 2-2. 特に指定の無い場合、 ツマミ類は以下のように設定してください。 ･ ...

  • Page 45

    45 mg12/4 mg16/4 2-6. 利得 2-2 の状態で各出力端子には[表2-6-1〜2-6-6]の範囲内の出力レベルが得られることを確認します。 ch表示で前の数字がmg12/4 を、 （ ） 内の数字がmg16/4 を表します。 表 2-6-1 ch input(1-4/8) [dbu ] input input gain st l out st r out group 1 ~ 2 aux1 aux2 c-r out *2 c-r out *3 level pre off pre on mic -80 max +1 +/- 2 *1 +1 +/- 2 *1 +4 +/- 2 +6...

  • Page 46

    46 mg12/4 mg16/4 2-7. 周波数特性 表2-6-1〜6 のq〜!0のついた系統において、 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は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。 * qの系統は、 ch.1 のみ全部のout で確認し、 ch. 2 以降はst l out のみ確認します。 * rの系統は、 st l out, st r out のみ確認します。 2-8. Hpf 表2-6-1 、 表2-6...

  • Page 47

    47 mg12/4 mg16/4 2-12. メーターled 点灯確認 st out が17.5 ±2dbu の時meter peak led が点灯します。 st out が4 ±2dbu の時meter 0 led が点灯します。 fader 操作により-20 からpeak led まで順に点灯することを確認します。 2-13. 歪み 表2-6-1〜6 のq〜!0 （e rを除く） 印のついた系統において、 20hz, 1khz, 20khz の入力に対してinput 及びmaster の 各vr, fader をnominal psition とし、 gain は表に従い設定し(phon...

  • Page 48

    48 mg12/4 mg16/4 2-17. Phantom mic 入力コネクタのピンq-w間に負荷抵抗10kΩ(1w 以上)を接続し、 ピンw-e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。 表 2-16-1 [dbu ] fader/vr stereo out group out aux out c-r out max -78.0 -80.0 -75.0 -72.0 min -100.0 -100.0 -100.0 -87.0 2-15. 入力換算雑音 2-2 の状態で、 ch inpu...

  • Page 49: Parts List

    Warning components having special characteristics are marked and must be replaced with parts having specification equal to those originally installed. Notes : destination abbreviations the numbers “qty” show quantities for each unit. The parts with “--” in “ part no. ” are not available as spare par...

  • Page 50: Overall Assembly

    Mg12/4 2 210 450 450 430 460 280 270 260 250 250 360 310 430 440 430 460 460 460 460 430 430 15 30 30 30 15 120 440 480 140 500 500 510 510 130 510 420 150 400 10 180 20 70 40a 50 60 40 350 520 520 320 320 320 320 250 220 230 100 320 110 310 170 450 40b jack 1/2 jack 2/2 430 430 300 ● rear view refl...

  • Page 51

    Mg12/4 3 overall assembly mg12/4 (we71540) * 10 circuit board main * 15 circuit board jack 1/2,2/2 * 20 circuit board ps 30 jumper wire smv2j p=2.0 13-40 7 * 40 connector assembly ac vh-3p z 40a power switch sddje3-a-2 u c s on/standby 07 40b tube black m5.0 (ch00428) z 50 connector 3p scmi405mos3n0...

  • Page 52: Electrical Parts

    Mg12/4 4 electrical parts ref no. Part no. Description remarks qty : new parts rank: japan only rank electrical parts mg12/4 * circuit board jack 1/2,2/2 (x6353b0) * circuit board main (x6346c0) * circuit board ps (we61240)(x6343b0) * circuit board jack 1/2,2/2 (x6353b0) c571 electrolytic cap. 10.00...

  • Page 53

    Mg12/4 5 ref no. Part no. Description remarks qty : new parts rank: japan only rank jkf71 phone jack st msj-064-20b b send aux1 01 jkf72 phone jack st msj-064-20b b send aux2 01 jkg71 cannon connector xlr-301p-a st out l 03 jkg72 phone jack st msj-064-20b b st out l 01 jkg73 cannon connector xlr-301...

  • Page 54

    Mg12/4 6 ref no. Part no. Description remarks qty : new parts rank: japan only rank -f74 carbon resistor (chip) 75.0 63m j rect. 01 rg71 carbon resistor (chip) 75.0 63m j rect. 01 rg72 carbon resistor (chip) 75.0 63m j rect. 01 * circuit board main (x6346c0) 50 meter reflector white level/power indi...

  • Page 55

    Mg12/4 7 ref no. Part no. Description remarks qty : new parts rank: japan only rank c632 electrolytic cap. 47.00 25.0v 01 c633 electrolytic cap. 100.00 16.0v 01 c634 ceramic capacitor-b (chip) 0.0100 50v k rect. 01 c635 ceramic capacitor-b (chip) 0.0100 50v k rect. 01 c636 electrolytic cap. 100.00 1...

  • Page 56

    Mg12/4 8 ref no. Part no. Description remarks qty : new parts rank: japan only rank c834 ceramic capacitor-b (chip) 0.0100 50v k rect. 01 c835 ceramic capacitor-b (chip) 0.0100 50v k rect. 01 c836 electrolytic cap. 100.00 16.0v 01 c841 ceramic capacitor-sl(chip) 100p 50v j rect. 01 c901 ceramic capa...

  • Page 57

    Mg12/4 9 ref no. Part no. Description remarks qty : new parts rank: japan only rank -a13 ceramic capacitor-sl(chip) 100p 50v j rect. 01 ca14 electrolytic cap. 470.00 6.3v 01 ca15 ceramic capacitor-sl(chip) 100p 50v j rect. 01 ca16 ceramic capacitor-sl(chip) 100p 50v j rect. 01 ca17 electrolytic cap....

  • Page 58

    Mg12/4 10 cb27 electrolytic cap. 10.00 25.0v 01 cb28 electrolytic cap. 10.00 25.0v 01 cb29 ceramic capacitor-sl(chip) 100p 50v j rect. 01 cb30 ceramic capacitor-sl(chip) 100p 50v j rect. 01 cb31 ceramic capacitor-sl(chip) 68p 50v j rect. 01 cb32 ceramic capacitor-sl(chip) 68p 50v j rect. 01 cb33 ele...

  • Page 59

    Mg12/4 11 ce01 ceramic capacitor-sl(chip) 220p 50v j rect. 01 ce02 ceramic capacitor-sl(chip) 220p 50v j rect. 01 ce03 ceramic capacitor-ch(chip) 47p 50v j rect. 01 ce04 ceramic capacitor-ch(chip) 47p 50v j rect. 01 ce05 electrolytic cap. 10.00 25.0v 01 ce06 ceramic capacitor-b (chip) 1000p 50v k re...

  • Page 60

    Mg12/4 12 ref no. Part no. Description remarks qty : new parts rank: japan only rank cg37 electrolytic cap. 10.00 25.0v 01 cg38 ceramic capacitor-ch(chip) 33p 50v j rect. 01 -g45 ceramic capacitor-ch(chip) 33p 50v j rect. 01 cg46 electrolytic cap. 100.00 25.0v 01 -g49 electrolytic cap. 100.00 25.0v ...

  • Page 61

    Mg12/4 13 ref no. Part no. Description remarks qty : new parts rank: japan only rank -a04 ic njm2068m-d(te2) op amp 02 icb01 ic njm2068m-d(te2) op amp 02 -b03 ic njm2068m-d(te2) op amp 02 icc01 ic njm2068m-d(te2) op amp 02 -c03 ic njm2068m-d(te2) op amp 02 icd01 ic njm2068m-d(te2) op amp 02 -d03 ic ...

  • Page 62

    Mg12/4 14 ref no. Part no. Description remarks qty : new parts rank: japan only rank q503 transistor 2sc3324 gr,bl tp 01 q504 transistor 2sc2412k q,r,s tp 01 q504 transistor 2scktc3875s-y,gr-r q505 transistor 2sc2412k q,r,s tp 01 q505 transistor 2scktc3875s-y,gr-r q506 transistor 2sa1037ak q,r,s tp ...

  • Page 63

    Mg12/4 15 ref no. Part no. Description remarks qty : new parts rank: japan only rank qg02 transistor 2sc3326 -a,b(te85r 01 qh01 transistor 2sc2412k q,r,s tp 01 qh01 transistor 2scktc3875s-y,gr-r qh02 transistor 2sa1037ak q,r,s tp 01 qh02 transistor 2sckta1504s-y,gr-r qh03 transistor 2sc2412k q,r,s t...

  • Page 64

    Mg12/4 16 ref no. Part no. Description remarks qty : new parts rank: japan only rank r615 carbon resistor (chip) 33.0k d 1608 01 r616 carbon resistor (chip) 220.0k 63m j rect. 01 r617 carbon resistor (chip) 16.0k 63m j rect. 01 r618 carbon resistor (chip) 33.0k 63m j rect. 01 r620 carbon resistor (c...

  • Page 65

    Mg12/4 17 ref no. Part no. Description remarks qty : new parts rank: japan only rank r743 carbon resistor (chip) 15.0k 63m j rect. 01 r745 carbon resistor (chip) 18.0k 63m j rect. 01 -748 carbon resistor (chip) 18.0k 63m j rect. 01 r749 carbon resistor (chip) 36.0k 63m j rect. 01 r750 carbon resisto...

  • Page 66

    Mg12/4 18 ref no. Part no. Description remarks qty : new parts rank: japan only rank r910 carbon resistor (chip) 2.2k 63m j rect. 01 r911 carbon resistor (chip) 2.2k 63m j rect. 01 r912 carbon resistor (chip) 2.2k d 1608 01 r913 carbon resistor (chip) 3.9k d 1608 01 r914 carbon resistor (chip) 220.0...

  • Page 67

    Mg12/4 19 ref no. Part no. Description remarks qty : new parts rank: japan only rank ra17 carbon resistor (chip) 6.2k d 1608 ra18 carbon resistor (chip) 6.2k d 1608 ra19 carbon resistor (chip) 47.0 63m j rect. 01 ra20 carbon resistor (chip) 47.0 63m j rect. 01 ra21 carbon resistor (chip) 15.0k 63m j...

  • Page 68

    Mg12/4 20 ref no. Part no. Description remarks qty : new parts rank: japan only rank rb24 carbon resistor (chip) 680.0 63m j rect. 01 rb25 carbon resistor (chip) 2.7k 63m j rect. 01 rb26 carbon resistor (chip) 2.7k 63m j rect. 01 rb27 carbon resistor (chip) 220.0 63m j rect. 01 rb28 carbon resistor ...

  • Page 69

    Mg12/4 21 ref no. Part no. Description remarks qty : new parts rank: japan only rank rc59 carbon resistor (chip) 220.0k 63m j rect. 01 rc60 carbon resistor (chip) 220.0k 63m j rect. 01 rd01 carbon resistor (chip) 220.0k 63m j rect. 01 rd02 carbon resistor (chip) 220.0k 63m j rect. 01 rd11 carbon res...

  • Page 70

    Mg12/4 22 ref no. Part no. Description remarks qty : new parts rank: japan only rank rg16 carbon resistor (chip) 18.0k 63m j rect. 01 rg17 carbon resistor (chip) 220.0 63m j rect. 01 rg18 carbon resistor (chip) 220.0 63m j rect. 01 rg19 carbon resistor (chip) 22.0k 63m j rect. 01 rg20 carbon resisto...

  • Page 71

    Mg12/4 23 ref no. Part no. Description remarks qty : new parts rank: japan only rank rh43 carbon resistor 2.2k 1/4 j ax tp 01 rh44 flame proof c. Resistor 10.0 1/4 j rx tp 01 rh45 flame proof c. Resistor 10.0 1/4 j rx tp 01 sw501 push switch ps-22e85l52 hpf 1 01 sw502 push switch ps-22e85l52 pre 1 0...

  • Page 72

    Mg12/4 24 ref no. Part no. Description remarks qty : new parts rank: japan only rank vr802 rotary variable resistor b 50.0k xv09213ynp low 4 03 vr803 rotary variable resistor b 50.0k xv09213ynp mid 4 03 vr804 rotary variable resistor b 50.0k xv09213ynp high 4 03 vr805 slide variable resistor 1sy6008...

  • Page 73

    Mg12/4 25 ref no. Part no. Description remarks qty : new parts rank: japan only rank 部 品 名 c24 electrolytic cap. 470.00 35.0v rx tp 01 c25 electrolytic cap. 100.00 160.0v rxst c26 electrolytic cap. 100.0 100.0v rx tp cn01 base post connector vh 3p se 01 cn02 connector base post ph 10p te 01 d01 diod...

  • Page 74: Parts List

    Warning components having special characteristics are marked and must be replaced with parts having specification equal to those originally installed. Notes : destination abbreviations the numbers “qty” show quantities for each unit. The parts with “--” in “ part no. ” are not available as spare par...

  • Page 75: Overall Assembly

    Mg16/4 2 overall assembly 510 140 120 490 440 480 410 70 40a 60 40 50 370 250 280 210 100 270 260 250 220 230 430 470 250 510 130 430 460 ● rear view 460 460 460 460 460 430 430 430 440 450 450 430 460 110 320 320 300 310 320 180 170 15 18 18 18 10 420 320 320 350 310 20 15 400 500 500 150 450 40b j...

  • Page 76

    Mg16/4 3 ref no. Part no. Description remarks qty : new parts rank: japan only rank overall assembly mg16/4 (we71550) * 10 circuit board main * 15 circuit board jack 1/2,2/2 18 jumper wire smv2j p=2.0 13-40 9 * 20 circuit board ps * 40 connector assembly ac vh-3p z 40a power switch sddje3-a-2 u c s ...

  • Page 77: Electrical Parts

    Mg16/4 4 electrical parts ref no. Part no. Description remarks qty : new parts rank: japan only rank electrical parts mg16/4 * circuit board jack 1/2,2/2 (x6254b0) * circuit board main (x6345c0) * circuit board ps (we61240)(x6343b0) * circuit board jack 1/2,2/2 (x6254b0) c171 electrolytic cap. 10.00...

  • Page 78

    Mg16/4 5 ref no. Part no. Description remarks qty : new parts rank: japan only rank jk471 cannon connector xlr-301j-a mic 4 03 jk472 phone jack st msj-064-20b b line 4 01 jk473 phone jack st msj-064-20b b insert i/o 4 01 jk571 cannon connector xlr-301j-a mic 5 03 jk572 phone jack st msj-064-20b b li...

  • Page 79

    Mg16/4 6 ref no. Part no. Description remarks qty : new parts rank: japan only rank r475 carbon resistor (chip) 100.0k 63m j rect. 01 r476 carbon resistor (chip) 33.0k d 1608 01 r477 carbon resistor (chip) 33.0k d 1608 01 r478 carbon resistor (chip) 4.7k d 1608 01 r571 carbon resistor (chip) 100.0k ...

  • Page 80

    Mg16/4 7 ref no. Part no. Description remarks qty : new parts rank: japan only rank 50 meter reflector white level/power indicator 80 adhesive tape 12x25 01 300 led spacer black 10 01 c101 ceramic capacitor-sl(chip) 470p 50v j rect. 01 -103 ceramic capacitor-sl(chip) 470p 50v j rect. 01 c104 electro...

  • Page 81

    Mg16/4 8 ref no. Part no. Description remarks qty : new parts rank: japan only rank c241 ceramic capacitor-sl(chip) 100p 50v j rect. 01 c301 ceramic capacitor-sl(chip) 470p 50v j rect. 01 -303 ceramic capacitor-sl(chip) 470p 50v j rect. 01 c304 electrolytic cap. 470.00 6.3v 01 c305 ceramic capacitor...

  • Page 82

    Mg16/4 9 ref no. Part no. Description remarks qty : new parts rank: japan only rank -503 ceramic capacitor-sl(chip) 470p 50v j rect. 01 c504 electrolytic cap. 470.00 6.3v 01 c505 ceramic capacitor-sl(chip) 470p 50v j rect. 01 c506 ceramic capacitor-ch(chip) 33p 50v j rect. 01 c507 ceramic capacitor-...

  • Page 83

    Mg16/4 10 ref no. Part no. Description remarks qty : new parts rank: japan only rank c705 ceramic capacitor-sl(chip) 470p 50v j rect. 01 c706 ceramic capacitor-ch(chip) 33p 50v j rect. 01 c707 ceramic capacitor-sl(chip) 100p 50v j rect. 01 c708 ceramic capacitor-ch(chip) 33p 50v j rect. 01 c709 elec...

  • Page 84

    Mg16/4 11 ref no. Part no. Description remarks qty : new parts rank: japan only rank c907 ceramic capacitor-sl(chip) 470p 50v j rect. 01 c908 ceramic capacitor-sl(chip) 100p 50v j rect. 01 c909 ceramic capacitor-sl(chip) 100p 50v j rect. 01 c910 electrolytic cap. 470.00 6.3v 01 c911 ceramic capacito...

  • Page 85

    Mg16/4 12 ref no. Part no. Description remarks qty : new parts rank: japan only rank ca22 electrolytic cap. 10.00 25.0v 01 ca23 electrolytic cap. 10.00 25.0v 01 ca24 ceramic capacitor-sl(chip) 100p 50v j rect. 01 ca25 electrolytic cap. 10.00 25.0v 01 ca27 mylar capacitor 0.0150 50v j rx tp 01 ca28 m...

  • Page 86

    Mg16/4 13 ref no. Part no. Description remarks qty : new parts rank: japan only rank -b40 ceramic capacitor-b (chip) 0.0100 50v k rect. 01 cb41 ceramic capacitor-sl(chip) 100p 50v j rect. 01 cb42 ceramic capacitor-sl(chip) 100p 50v j rect. 01 cc01 electrolytic cap. 10.00 25.0v 01 cc02 electrolytic c...

  • Page 87

    Mg16/4 14 ref no. Part no. Description remarks qty : new parts rank: japan only rank -e13 ceramic capacitor-sl(chip) 100p 50v j rect. 01 ce14 ceramic capacitor-sl(chip) 68p 50v j rect. 01 ce15 ceramic capacitor-sl(chip) 68p 50v j rect. 01 ce16 electrolytic cap. 100.00 16.0v 01 ce17 electrolytic cap....

  • Page 88

    Mg16/4 15 ref no. Part no. Description remarks qty : new parts rank: japan only rank cg60 ceramic capacitor-b (chip) 0.0100 50v k rect. 01 cg61 electrolytic cap. 100.00 16.0v 01 cg62 electrolytic cap. 100.00 16.0v 01 cg63 ceramic capacitor-b (chip) 0.0100 50v k rect. 01 cg64 ceramic capacitor-b (chi...

  • Page 89

    Mg16/4 16 ref no. Part no. Description remarks qty : new parts rank: japan only rank ica01 ic njm4580ed op amp 02 ica02 ic njm2068m-d(te2) op amp 02 -a04 ic njm2068m-d(te2) op amp 02 icb01 ic njm2068m-d(te2) op amp 02 -b03 ic njm2068m-d(te2) op amp 02 icc01 ic njm2068m-d(te2) op amp 02 -c03 ic njm20...

  • Page 90

    Mg16/4 17 ref no. Part no. Description remarks qty : new parts rank: japan only rank ldh15 led yellow hfy103tp-1-00 r +3 01 ldh16 led yellow hfy103tp-1-00 r +1 01 ldh17 led yellow hfy103tp-1-00 r 0 01 ldh18 led green hfg203tp-1-00 r -1 01 ldh19 led green hfg203tp-1-00 r -3 01 ldh20 led green hfg203t...

  • Page 91

    Mg16/4 18 ref no. Part no. Description remarks qty : new parts rank: japan only rank q603 transistor 2sc3324 gr,bl tp 01 q604 transistor 2sc2412k q,r,s tp 01 q604 transistor 2scktc3875s-y,gr-r q605 transistor 2sc2412k q,r,s tp 01 q605 transistor 2scktc3875s-y,gr-r q606 transistor 2sa1037ak q,r,s tp ...

  • Page 92

    Mg16/4 19 ref no. Part no. Description remarks qty : new parts rank: japan only rank r102 carbon resistor (chip) 10.0 63m j rect. 01 r103 carbon resistor (chip) 47.0k d 1608 01 r104 carbon resistor (chip) 47.0k d 1608 01 r105 carbon resistor (chip) 10.0 63m j rect. 01 r106 carbon resistor (chip) 2.2...

  • Page 93

    Mg16/4 20 ref no. Part no. Description remarks qty : new parts rank: japan only rank r227 carbon resistor (chip) 680.0 63m j rect. 01 r228 carbon resistor (chip) 2.7k 63m j rect. 01 r229 carbon resistor (chip) 2.7k 63m j rect. 01 r230 carbon resistor (chip) 47.0k 63m j rect. 01 r232 carbon resistor ...

  • Page 94

    Mg16/4 21 ref no. Part no. Description remarks qty : new parts rank: japan only rank r404 carbon resistor (chip) 47.0k d 1608 01 r405 carbon resistor (chip) 10.0 63m j rect. 01 r406 carbon resistor (chip) 2.2k d 1608 01 r407 carbon resistor (chip) 3.9k d 1608 01 r408 carbon resistor (chip) 10.0k d 1...

  • Page 95

    Mg16/4 22 ref no. Part no. Description remarks qty : new parts rank: japan only rank r521 carbon resistor (chip) 220.0k 63m j rect. 01 r522 carbon resistor (chip) 10.0k 63m j rect. 01 r523 carbon resistor (chip) 680.0 63m j rect. 01 r524 carbon resistor (chip) 2.7k 63m j rect. 01 r525 carbon resisto...

  • Page 96

    Mg16/4 23 ref no. Part no. Description remarks qty : new parts rank: japan only rank r650 carbon resistor (chip) 36.0k 63m j rect. 01 r651 carbon resistor (chip) 18.0k 63m j rect. 01 r652 carbon resistor (chip) 18.0k 63m j rect. 01 r661 carbon resistor (chip) 220.0 63m j rect. 01 r701 carbon resisto...

  • Page 97

    Mg16/4 24 ref no. Part no. Description remarks qty : new parts rank: japan only rank r822 carbon resistor (chip) 10.0k 63m j rect. 01 r823 carbon resistor (chip) 680.0 63m j rect. 01 r824 carbon resistor (chip) 2.7k 63m j rect. 01 r825 carbon resistor (chip) 10.0k 63m j rect. 01 r826 carbon resistor...

  • Page 98

    Mg16/4 25 ref no. Part no. Description remarks qty : new parts rank: japan only rank r940 carbon resistor (chip) 2.7k 63m j rect. 01 r941 carbon resistor (chip) 10.0k 63m j rect. 01 r942 carbon resistor (chip) 680.0 63m j rect. 01 r943 carbon resistor (chip) 2.7k 63m j rect. 01 r944 carbon resistor ...

  • Page 99

    Mg16/4 26 ref no. Part no. Description remarks qty : new parts rank: japan only rank ra49 carbon resistor (chip) 100.0k 63m j rect. 01 ra50 carbon resistor (chip) 10.0k 63m j rect. 01 ra51 carbon resistor (chip) 100.0k 63m j rect. 01 ra52 carbon resistor (chip) 4.7k 63m j rect. 01 ra53 carbon resist...

  • Page 100

    Mg16/4 27 ref no. Part no. Description remarks qty : new parts rank: japan only rank rc08 carbon resistor (chip) 8.2k 63m j rect. 01 rc09 carbon resistor (chip) 18.0k 63m j rect. 01 rc10 carbon resistor (chip) 18.0k 63m j rect. 01 rc11 carbon resistor (chip) 10.0k 63m j rect. 01 rc12 carbon resistor...

  • Page 101

    Mg16/4 28 ref no. Part no. Description remarks qty : new parts rank: japan only rank re07 carbon resistor (chip) 36.0k 63m j rect. 01 re08 carbon resistor (chip) 36.0k 63m j rect. 01 re09 carbon resistor (chip) 220.0 63m j rect. 01 re10 carbon resistor (chip) 220.0 63m j rect. 01 re11 carbon resisto...

  • Page 102

    Mg16/4 29 ref no. Part no. Description remarks qty : new parts rank: japan only rank rg50 carbon resistor (chip) 18.0k d 1608 rg51 carbon resistor (chip) 18.0k d 1608 rg52 carbon resistor (chip) 75.0 63m j rect. 01 -g55 carbon resistor (chip) 75.0 63m j rect. 01 rg56 carbon resistor (chip) 100.0k 63...

  • Page 103

    Mg16/4 30 ref no. Part no. Description remarks qty : new parts rank: japan only rank sw506 push switch ps-22e85l52 2tr in phantom 01 sw601 push switch ps-22e85l52 hpf 6 01 sw602 push switch ps-22e85l52 pre 6 01 sw603 push switch ps-42e85l(3.3x3.3) st 6 01 sw604 push switch ps-22e85l52 1-2 6 01 sw605...

  • Page 104

    Mg16/4 31 vr502 rotary variable resistor b 50.0k xv09213ynp low 5 03 vr503 rotary variable resistor b 50.0k xv09213ynp mid 5 03 vr504 rotary variable resistor b 50.0k xv09213ynp high 5 03 vr505 slide variable resistor 1sy6008 ch fader 5 04 vr506 rotary variable resistor xv012313y 15a15c20 pan 5 04 v...

  • Page 105

    Mg16/4 32 ref no. Part no. Description remarks qty : new parts rank: japan only rank 部 品 名 w101 connector assembly gnd 1p (we78460) * circuit board ps (we61240)(x6343b0) 50 heat sink (v966100) 60 bind head tapping screw-b 3.0x8 mfzn2w3 5 01 65 bind head tapping screw-b 3.0x8 mfzn2w3 3 01 70 silicon ...

  • Page 106: Circuit Diagram

    Contents block diagram & level diagram ................................ 3 overall circuit diagram main .............................................................................. 4 – 8 jack 1/2 ........................................................................ 9, 10 jack 2/2 ..................

  • Page 107

    A b c d e f g h a b c d e f g h 1 2 3 4 5 6 mg12/4 mg16/4 3 ■ block diagram & level diagram st out jk101,271,371,471 jk571,671,771,871 jk172,272,372,472 jk572,672,772,872 ic101,201,301,401 ic501,601,701,801 ic102,302,502,702 jk173,273,373,473 jk573,673,773,873 ic103,303,503,703 jk971 jka71 jk972 jka...

  • Page 108

    A b c d e f g h a b c d e f g h 1 2 3 4 5 6 mg12/4 mg16/4 4 (to p.8-e1) (to p.8-e2) (to p.8-a1) (to p.8-a2) (to p.8-a3) (to p.8-a4) (to p.8-e2) (to p.8-e3) (to p.8-e3) 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 to j a ck 1/2-cn171 ...

  • Page 109

    A b c d e f g h a b c d e f g h 1 2 3 4 5 6 mg12/4 mg16/4 5 (to p.9-a1) (to p.9-a4) (to p.10-b1) to j a ck 1/2-cn571 (to p .9-b1) to j a ck 1/2-cn771 (to p .9-f1) 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 (to p.8-e1) (to p.8-e2) (...

  • Page 110

    A b c d e f g h a b c d e f g h 1 2 3 4 5 6 mg12/4 mg16/4 6 op amp op amp op amp op amp op amp op amp op amp op amp op amp op amp op amp op amp to j a ck 1/2-cn971 (to p .10-c2) to j a ck 1/2-cna71 (to p .10-c4) op amp op amp op amp op amp (to p.8-e1) (to p.8-e2) (to p.8-a1) (to p.8-a2) (to p.8-a3) ...

  • Page 111

    A b c d e f g h a b c d e f g h 1 2 3 4 5 6 mg12/4 mg16/4 7 to j a ck 1/2-cnd71 (to p .10-e2) 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 (from p.6-g5) (from p.6-g5) (to p.8-e1) (to p.8-e2) (to p.8-a1) (to p.8-a2) (to ...

  • Page 112

    A b c d e f g h a b c d e f g h 1 2 3 4 5 6 mg12/4 mg16/4 8 (from p.4-h1) (from p.5-h1) (from p.6-h2) (from p.7-h1) (from p.8-a3) (from p.4-h1) (from p.5-h1) (from p.6-h2) (from p.7-h1) (from p.8-a3) (from p.4-h2) (from p.5-h2) (from p.6-h3) (from p.7-h2) (from p.4-h2) (from p.5-h2) (from p.6-h3) (f...

  • Page 113

    A b c d e f g h a b c d e f g h 1 2 3 4 5 6 mg12/4 mg16/4 9 (from p.5-a1) to main-cn501 (to p.5-a2) to main-cn701 (to p.5-a4) to main-cn101 (to p.4-a2) to main-cn301 (to p.4-a4) (from p.5-a1) ■ overall circuit diagram 6/8 jack 1/2 28cc1-8834990-1 : flame proof carbon resistor note : see parts list f...

  • Page 114

    A b c d e f g h a b c d e f g h 1 2 3 4 5 6 mg12/4 mg16/4 10 (to p.5-a1) to main-cn901 (to p .6-a2) to main-cna01 (to p .6-a4) to main-cnd01 (to p .7-a3) to main-cng01 (to p .8-h1) to main-cne01 (to p .8-d1) to main-cnh01 (to p .8-h4) l r st out r c-r out st out l 1 2 group out aux1 aux2 send phones...

  • Page 115

    A b c d e f g h a b c d e f g h 1 2 3 4 5 6 mg12/4 mg16/4 11 on/standby (power) ac adaptor in regulator +15v regulator -15v regulator +12v regulator +5v ps z z z z to main-cnf01 (to p .8-d5) ■ overall circuit diagram 8/8 ps kia7815api(x4930a00) regulator +15v ps: ic01 kia7915pi(x4931a00) regulator -...