Yamaha MG10-2 Service Manual

MG10/2
MIXING CONSOLE
SERVICE MANUAL
011679
PA
200306-14800

CONTENTS

SPECIFICATIONS ................................................ 3/5
DIMENSIONS ............................................................ 7
PANEL LAYOUT ..................................... 8
CIRCUIT BOARD LAYOUT & WIRING
(ユニットレイアウト&結線図)
DISASSEMBLY PROCEDURE ............................ 12
IC BLOCK DIAGRAM .................................. 14
CIRCUIT BOARD ......................................... 15
INSPECTIONS ....................................................... 17/21
PARTS LIST BLOCK DIAGRAM & LEVEL DIAGRAM
(ブロックダイアグラム&レベルダイアグラム)
OVERALL CIRCUIT DIAGRAM
Copyright (c) Yamaha Corporation. All rights reserved. PDF-K135 ’03.04
(目次)
総合仕様
寸法図
(パネルレイアウト)
(ICブロック図)
(シート基板図)
(検査)
(分解手順)
(総回路図)
............................................ 11
HAMAMATSU, JAPAN
1
MG10/2
IMPOR T ANT 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 have therefore not been restated.
WARNING : Failure to follow appropriate service and safety procedures when servicing this product may result in per-
IMPORTANT : This presentation or sale of this manual to any individual or firm does not constitute authorization certifi-
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 improve 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 distributor’s Service Division.
WARNING : Static discharges can destroy expensive components. Discharge any static electricity your body may have
IMPORTANT : Turn the unit OFF during disassembly and parts replacement. Recheck all work before you apply power
sonal injury, destruction of expensive components and failure of the product to perform as specified. For 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.
cation, recognition of any applicable technical capabilities, or establish a principal-agent relationship of any form.
accumulated by grounding yourself to the ground bus in the unit (heavy gauge black wires connect to this bus.)
to the unit.
WARNING: 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 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 solder/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 KINGDOM
Connecting the Plug and Cord
IMPORTANT. The wires in this mains lead are coloured in accordance with the following code:
As the colours of the wires in the mains lead of this apparatus may not correspond with the coloured makings identifying the terminals in your plug proceed as follows: The wire which is coloured BLUE must be connected to the terminal which is marked with the letter N or coloured BLACK. The wire which is coloured BROWN must be connected to the terminal which is marked with the letter L or coloured RED. Making sure that neither core is connected to the earth terminal of the three pin plug.
BLUE : NEUTRAL BROWN : LIVE
WARNING
Components having special characteristics are marked and must be replaced with parts having specification equal to those originally installed.
印の商品は、安全を維持するために重要な部品です。交換する場合は、安全のために必ず指定の部品をご使用ください。
2

SPECIFICATIONS

General Specifications
Frequency Characteristics (ST OUT) 20 Hz–20 kHz +1 dB, –3 dB @+4 dBu, 10 k Total Harmonic Distortion (ST OUT)
Hum and Noise
Maximum Voltage Gain
Monaural/Stereo Input Gain Control 44 dB variable Monaural/Stereo High Pass Filter 80 Hz 12 dB/octave
Crosstalk (1 kHz)
Monaural/Stereo Input Channel Equalization: Max. Variation
Monaural/Stereo Input Peak Indicator
Level Meters
Phantom +48 VDC Power (Balanced input) Supplied when Phantom +48 V switch is ON. Included Accessory Power adaptor (PA-10) Option Microphone-stand adaptor (BMS-10A)
Power Supply
Power Consumption 19 W Max. Dimensions (W Weight kg
1
2
3
×H ×
D) 251
Where 0 dBu = 0.775 V and 0 dBV = 1 V
0.1 % (THD+N) @+14 dBu, 20 Hz–20 kHz, 10 kΩ (with gain control at maximum level) (CHs 1 and 2)
–128 dBu Equivalent input noise (CHs 1 and 2) –100 dBu Residual output noise (ST OUT)
–87 dBu (91 dB S/N) –85 dBu (89 dB S/N) All channel mix controls at minimum level. –64 dBu (68 dB S/N) 60 dB CH MIC INPUT → CH INSERT OUT
76 dB CH MIC INPUT → ST OUT
64.2 dB CH MIC INPUT → REC OUT 70 dB CH MIC INPUT →AUX SEND1 (PRE) 76 dB CH MIC INPUT → AUX SEND2 (POST) 76 dB ST CH MIC INPUT → ST OUT 50 dB ST CH LINE INPUT → ST OUT 41 dB ST CH LINE INPUT → AUX SEND1 (PRE) 47 dB ST CH LINE INPUT → AUX SEND2 (POST) 26 dB ST CH INPUT → ST OUT 12 dB AUX RETURN → ST OUT
23.8 dB 2TR INPUT → ST OUT
–70 dB between input channels –70 dB between input/output channels (CHs 1 to 6)
±15 dB HIGH 10 kHz shelving MID 2.5 kHz peaking LOW 100 Hz shelving
On each channel: red indicator lights if post-EQ signal (on ST channels, if either post-EQ sig­nal or post-mic-amp signal) comes within 3 dB of the clipping level.
Two 12-point LED meters [Stereo (L, R)] Peak point: red indicator +5, +3, +1, and 0 points: yellow indicators –1, –3, –5, –7, –10, –15, –20: green indicators
USA and Canada: 120 V AC, 60 Hz Europe: 230 V AC, 50 Hz Australia: 240 V AC, 50 Hz Korea: 220 V AC, 60 Hz
×
65 ×290.5 mm
1.8
ST, Master fader at nominal level and all Ch at minimum level.
ST, Master fader and one Ch fader at nominal level. (CHs 1 and 2)
(with gain control at maximum level)
MG10/2
1
Measured with 12.7 kHz, –6 dB/oct. low pass filter (equivalent to 20 kHz, – filter). (CH MIC INPUT to ST, AUX, EFFECT SEND)
2
Turning PAN/BAL to left or right.
3
Shelving turnover/rolloff frequency: 3 dB before maximum cut or boost.
3
MG10/2
Input Specifications
Input Connector Gain
MIC INPUT (CH 1-2)
LINE INPUT (CH 1, 2)
ST CH MIC INPUT (CH3/CH4,CH5/CH6)
ST CH LINE INPUT (CH3(L)/CH4(R), CH5(L)/CH6(R))
ST CH INPUT (CH7(L)/CH8(R), CH9(L)/CH10(R))
CH INSERT IN (CH 1, 2)
AUX RETURN (L, R) 10 k 600 line
–60
–16
–34
+10
–60
–16
–34
+10
Input
Impedance
3 k 50–600 mic
10 k 600 line
3 k 50–600 mic
10 k 600 line
10 k 600 line
10 k 600 line
Appropriate
Impedance
Sensitivity* Rated Level
–72 dBu (0.195 mV)
–28 dBu (30.9 mV)
–46 dBu (3.88 mV)
–2 dBu (0.616 V)
–72 dBu (0.195 mV)
–28 dBu (30.9 mV)
–46 dBu (3.88 mV)
–2 dBu (0.616 V)
–22 dBu (61.6 mV)
–20 dBu (77.5 mV)
–12 dBu (195 mV)
–60 dBu (0.775 mV)
–16 dBu (123 mV)
–34 dBu (15.5 mV)
+10 dBu (2.45 V)
–60 dBu (0.775 mV)
–16 dBu (123 mV)
–34 dBu (15.5 mV)
+10 dBu (2.45 V)
–10 dBu (245 mV)
0 dBu (0.775 V)
+4 dBu (1.23 V)
Max. Before
Clipping
–40 dBu (7.75 mV)
+4 dBu (1.23 V)
–14 dBu (155 mV)
+30 dBu (24.5 V)
–40 dBu (7.75 mV)
–10 dBu (245 mV)
–14 dBu (155 mV)
+30 dBu (24.5 V)
+10 dBu (2.45 V)
+20 dBu (7.75 V)
+24 dBu (12.3 V)
Connector
Specifications
XLR-3-31 type (balanced)
Phone jack (TRS) (balanced [T: hot; R: cold; S: ground])
XLR-3-31 type (balanced)
Phone jack (unbalanced)
Phone jack (unbalanced); RCA pin jack
Phone jack (TRS) (unbalanced [T: out; R: in; S: ground])
Phone jack (TRS) (unbalanced [T: hot; S: ground])
2TR IN (L, R) 10 k 600 line
–26 dBV (50.1 mV)
–10 dBV (316 mV)
+10 dBV (3.16 V)
RCA pin jack
Where 0 dBu = 0.775 V and 0 dBV= 1V
* Input sensitivity: the lowest level that will produce the nominal output level when the unit is set to maximum gain.
Output Specifications
Output Connectors
ST OUT (L, R) 150 10 k line +4 dBu (1.23 V) +20 dBu (7.75 V)
AUX SEND (1, 2) 150 10 k line +4 dBu (1.23 V) +20 dBu (7.75 V)
CH INSERT OUT (CH 1, 2) 150 10 k line 0 dBu (0.775 V) +20 dBu (7.75 V)
REC OUT (L, R) 600 10 k line –10 dBV (316 mV) +10 dBV (3.16 V) RCA pin jack
C-R OUT (L, R) 150 10 k line +4 dBu (1.23 V) +20 dBu (7.75 V)
PHONES 100 40 phone 3 mW 75 mW Stereo phone jack
Output
Impedance
Where 0 dBu = 0.775 V and 0 dBV= 1 V
Appropriate
Impedance
Rated Level
Max. Before
Clipping
Connector Specifications
Phone jack (TRS) (impedance balanced [T: hot; R: cold; S: ground])
Phone jack (TRS) (impedance balanced [T: hot; R: cold; S: ground])
Phone jack (TRS) (unbalanced [T: out; R: in; S: ground])
Phone jack (TRS) (impedance balanced [T: hot; R: cold; S: ground])
4

総合仕様

一般仕様
*
0 dBu = 0.775 V
、
0 dBV = 1 V
とする
*1 Rs = 150 ohms
@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
、
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
 
@
+4 dBu
(*)、
10 k
Ω(
GAIN
コントロール=最大レベル)
全高調波歪率(ST OUT)
0.1 %
(
THD+N
)
@+14 dBu, 20 Hz
〜
20 kH
、
10 k
Ω(
GAIN
コントロール=最大レベル)
(CH1
、
2)
ハム & ノイズ
*1
–128 dBu
入力換算ノイズ
(CH1
、
2)
–100 dBu
残留ノイズ
(ST OUT)
–87 dBu
(
91 dB S/N
)
ST
マスターコントロール=ノミナル、
全チャンネルコントロール=最小レベル
–85 dBu
(
89 dB S/N
)
全チャンネルミックスコントロール=最小レベル
–64 dBu
(
68 dB S/N
)
ST
マスターコントロール& 1チャンネルコントロール=ノミナ
ル
(CH1
、
2)
最大電圧ゲイン
*2
60 dB
 
CH MIC INPUT
→
CH INSERT OUT
76 dB
 
CH MIC INPUT
→
ST OUT
64.2 dB
 
CH MIC INPUT
→
REC OUT
70 dB
 
CH MIC INPUT
→
AUX SEND1
(
PRE
)
76 dB
 
CH MIC INPUT
→
AUX SEND2
(
POST
)
76 dB
 
ST CH MIC INPUT
→
ST OUT
50 dB
 
ST CH LINE INPUT
→
ST OUT
41 dB
 
ST CH LINE INPUT
→
AUX SEND1
(
PRE
)
47 dB
 
ST CH LINE INPUT
→
AUX SEND2
(
POST
)
26 dB
 
ST CH INPUT
→
ST OUT
12 dB
 
AUX RETURN
→
ST OUT
23.8 dB
 
2TR INPUT
→
ST OUT
モノラル、ステレオインプットゲインコントロール
44 dB
可変
モノラル、ステレオハイパスフィルター
80 Hz 12 dB/octave
クロストーク
(1 kHz)
–70 dB
入力チャンネル間
–70 dB
入出力チャンネル間
(CH1
〜
6)
モノラル、ステレオ入力チャンネルイコライザー 特性最大可変幅
*3
±15 dB HIGH 10 kHz
シェルビングタイプ
MID 2.5 kHz
ピーキングタイプ
LOW 100 Hz
シェルビングタイプ
モノラル、ステレオインプットピークインジケーター
各チャンネル、イコライザー(および
MIC
アンプ:
ST CH
)の後段において、どちらか
一方の信号レベルがクリッピングの手前
3 dB
に達すると赤く点灯
レベルメーター
12
ポイント
LED
× 2 [ステレオ( L、 R)]
ピーク時:赤のインジケーター
+5
、 +3、 +1、 0:黄のインジケーター
–1
、
–3
、 –5、 –7、
–10
、
–15
、
–20
:緑のインジケーター
ファンタム電源
+48 VDC
(バランス入力)
PHANTOM +48 V
スイッチ= ONで供給
付属品
電源アダプター
(PA-10)
オプション マイクスタンドアダプター(
BMS-10A
)
電源
100 V AC 50/60 Hz
消費電力
19 W
最大外形寸法( W× H× D)
W251
×
H65
×
D290.5 mm
質量
1.8 kg
MG10/2
5
MG10/2
)
入力仕様
入力端子名称 ゲイン
MIC INPUT
)
(CH1-2
LINE INPUT (CH1
2)
、
ST CH MIC INPUT (CH3/CH4
CH5/CH6)
、
ST CH LINE INPUT (CH3(L)/CH4(R)
、
CH5(L)/CH6(R))
ST CH INPUT (CH7(L)/CH8(R)
、
CH9(L)/CH10(R)) CH INSERT IN
、
(CH1
2)
AUX RETURN (L
2TR IN (L
*
*1
、
、
R)
0 dBu=0.775 V
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
R)
0 dBV=1 V
、
–60
–16
–34
+10
–60
–16
–34
+10
入力イン
ピーダンス
3 k
10 k
3 k
10 k
10 k
10 k
10 k
10 k
とする
Ω
Ω
Ω
Ω
Ω
Ω
Ω
Ω
適合インピーダンス
〜
50
600
600
50
600
600
600
600
600
〜
Ωライン
600
Ωライン
Ωライン
Ωライン
Ωライン
Ωライン
Ωマイク
Ωマイク
–72 dBu
(
0.195 mV
–28 dBu
30.9 mV
(
–46 dBu
3.88 mV
(
–2 dBu
0.616 V
(
–72 dBu
0.195 mV
(
–28 dBu
30.9 mV
(
–46 dBu
3.88 mV
(
–2 dBu
(
0.616 V
–22 dBu
(
61.6 mV
–20 dBu
(
77.5 mV
–12 dBu
(
195 mV
–26 dBV
(
50.1 mV
感度
*1
)
)
)
)
)
)
)
)
)
)
)
)
規定レベル
–60 dBu
(
0.775 mV
–16 dBu
123 mV
(
–34 dBu
15.5 mV
(
+10 dBu
2.45 V
(
–60 dBu
0.775 mV
(
–16 dBu
123 mV
(
–34 dBu
15.5 mV
(
+10 dBu
(
2.45 V
–10 dBu
(
245 mV
0 dBu
(
0.775 V
+4 dBu
(
1.23 V
–10 dBV
(
316 mV
リップレベル
–40 dBu
(
+4 dBu
)
(
–14 dBu
)
(
+30 dBu
)
(
–40 dBu
(
–10 dBu
)
(
–14 dBu
)
(
+30 dBu
)
(
+10 dBu
)
(
+20 dBu
)
(
+24 dBu
)
(
+10 dBV
)
(
最大ノンク
)
7.75 mV
1.23 V
)
155 mV
)
24.5 V
)
7.75 mV
)
245 mV
)
155 mV
)
)
24.5 V
)
2.45 V
)
7.75 V
)
12.3 V
)
3.16 V
端子仕様
XLR-3-31
(バランス型)
タイプ
フォーンジャック
TRS
(
) (バランス
型[ T:ホット、
R:
コールド、
S
:グラウンド])
XLR-3-31
(バランス型)
タイプ
フォーンジャック
(アンバランス型)
フォーンジャック
(アンバランス型)
ピンジャック
RCA
フォーンジャック
(
)
TRS
(アンバランス型
:アウト、
[
T
ン、
:イ
R
:グラウンド]
S
フォーンジャック
(
)(アンバラ
TRS
ンス型[ T:ホット、
グラウンド])
S:
ピンジャック
RCA
出力端子名称
ST OUT (L
AUX SEND (1
CH INSERT OUT (CH1
REC OUT (L C-R OUT (L
PHONES
*
6
R)
、
、
2)
、
、
0 dBu=0.775 V
2) 150
、
R)
R)
出力インピーダンス適合インピーダンス
150
Ω
Ω
Ω
150
Ω
600
Ω
150
Ω
100
0 dBV=1 V
、
とする
10 k
Ωライン
10 k
Ωライン
Ωライン
10 k
Ωライン
10 k
Ωライン
10 k
Ωフォーン
40
規定レベル
+4 dBu
(
+4 dBu
(
(
0 dBu
–10 dBV
(
+4 dBu
3 mW
1.23 V
1.23 V
0.775 V
(
316 mV
1.23 V
最大ノンクリップレベル
)
)
)
)
)
+20 dBu
+20 dBu
+20 dBu
+10 dBV +20 dBu
(
(
(
(
(
7.75 V
7.75 V
7.75 V
3.16 V
7.75 V
75 mW
端子仕様
)
フォーンジャック(
TRS
(インピーダンスバランス型 [ T:ホット、 R:コールド、
S:
グラウンド])
)
フォーンジャック(
TRS
(インピーダンスバランス型 [ T:ホット、 R:コールド、
S:
グラウンド])
) フォーンジャック(
(アンバランス型[ T:アウト、
:イン、 S:グラウンド])
R
) )
ピンジャック
RCA
フォーンジャック(
TRS
(インピーダンスバランス型 [ T:ホット、 R:コールド、
グラウンド])
S:
ステレオフォーンジャック
)
)
TRS
)
)
MG10/2

DIMENSIONS

(寸法図)
251
65
290.5
Units: mm
(単位)
7
MG10/2

PANEL LAYOUT

Channel Control Section
Channels
1 and 2
(Monaural)
(パネルレイアウト)
(チャンネルコントロール部)
Channels
3/4 and 5/6
(Stereo)
Channels
7/8 and 9/10
(Stereo)
1
[GAIN] Control
2
[PEAK] Indicator
3
[ 80 ] Switch (High Pass Filter)
4
Equalizer ([HIGH], [MID], and [LOW])
5
[AUX] Controls
6
[PAN] Control (CHs 1 and 2) [PAN/BAL] Control (CHs 3/4 and 5/6) [BAL] Control (CHs 7/8 and 9/10)
7
Channel Fader
[GAIN]コントロール
1
[PEAK]インジケーター
2
[
3 4 5 6
7
](ハイパスフィルター)スイッチ
80
イコライザー([HIGH]、[MID]、[LOW]) [AUX]コントロール [PAN]コントロール(CH1、2) [PAN/BAL]コントロール(CH3/4、5/6) [BAL]コントロール(CH7/8、9/10) チャンネルコントロール
Master Control Section
(マスターコントロール部)
1
[PHANTOM +48 V] Switch
2
[RETURN] Control
3
[2TR IN] Control
4
[ST] Master Fader
5
[C-R/PHONES] Control
6
Level Meter
7
[POWER] Indicator
[PHANTOM+48V]スイッチ
1
[RETURN]コントロール
2
[2TRIN]コントロール
3
[ST]マスターコントロール
4
[C‐R/PHONES]コントロール
5
レベルメーター
6
[POWER]インジケーター
7
8
MG10/2
Input/Output Section
1
Channel Input Jacks (CHs 1, 2, 3/4, 5/6)
2
[INSERT I/O] Jacks (CHs 1, 2)
3
Channel Input Jacks (CHs 7/8, 9/10)
4
[2TR IN] Jacks
5
[REC OUT] (L, R) Jacks
6
[ST OUT] (L, R) Jacks
7
[C-R OUT] Jacks
8
[SEND] Jacks
9
[RETURN] L (MONO), R Jacks
10
[PHONES] Jack
(入出力部)
1
チャンネルINPUT端子(CH1、2、3/4、5/6)
2
[INSERTI/O]端子(CH1、2)
3
チャンネルINPUT端子(CH7/8、9/10)
4
[2TRIN]端子
5
[RECOUT](L、R)端子
6
[STOUT](L、R)端子
7
[C‐ROUT]端子
8
[SEND]端子
9
[RETURN]L(MONO)、R端子 [PHONES]端子
10
Rear Section
(リア部)
1
[AC ADAPTOR IN] Connector
2
POWER Switch
1
[ACADAPTORIN]端子
2
電源スイッチ
9
MG10/2
Connector Polarities
INPUT OUTPUT
MIC INPUT
Pin 1: Ground Pin 2: Hot (+) Pin 3: Cold (–)
LINE INPUT (monaural channels), ST OUT, C-R OUT, AUX1, AUX2*
Tip: Hot (+) Ring: Cold (–) Sleeve: Ground
Ring
Tip: Output
INSERT I/O
Ring: Input Sleeve: Ground
Tip: L
Sleeve Tip
PHONES
Ring: R Sleeve: Ground
RETURN, LINE INPUT (stereo channels)
Tip: Hot Sleeve: Ground
Sleeve Tip
* These jacks will also accept connection to monaural phone plugs. If you use monaural plugs, the connection will be unbalanced.
端子接続の極性
INPUT OUTPUT
MIC INPUT
ピン 1:グラウンド ピン 2:ホット( +) ピン 3:コールド( –)
LINE INPUT ST OUT
AUX 1
INSERT I/O
PHONES
RETURN LINE INPUT
(モノラルチャンネル)、
、
C-R OUT
AUX 2
 
*
、
(ステレオチャンネル)
チップ:ホット( +) リング:コールド( –) スリーブ:グラウンド
チップ: リング:
Output Input
スリーブ:グラウンド チップ:
リング:
L R
スリーブ:グラウンド
チップ:ホット スリーブ:グラウンド
リング
スリーブ チップ
スリーブ チップ
*これらの端子に、モノラルタイプのフォーン端子を使用することもできます。その場合は、アンバランスになります。
10
MG10/2
(束線を左に引っぱった状態でインシュロックタイを止めます。)

CIRCUIT BOARD LAYOUT & WIRING

Rear view
Top view
(ユニットレイアウト&結線図)
Right side view
MAIN
Power switch and AC connector wiring
(電源スイッチとACコネクタの結線)
(V975620) (Connector assembly 2P BROWN, RED)
(1回ひねります。)
V9737300 (MAIN circuit board)
V998150 (Connector assembly 3P BROWN, RED, BLACK)
Shrink Tube(熱収縮チューブのつけ方)
WB071100 (Shrink tube: Seven places)
(熱収縮チューブ:7箇所)
Need twist of one rotation.
Cable Colors
RED
BLACK
(ケーブルの色)
RED
BROWN
Cable Tie(ケーブルの結び方)
VV104600 (Cable Tie)
Bundle the four cables connected to power switch by the cable tie and pull to left side.
Wiring to MAIN circuit board
(MAINシートへの結線)
Need twist of
one rotation.
(1回ひねります。)
RED
BROWN
(V998150) is soldering on solder side.
(基板のハンダ面にハンダ付けします。)
When soldering a wire, it fixed in the state that inclined to the left about 45 degrees, and it wires so that it may not be from white slash area of circuit board.
(電源スイッチの配線は左に45°の向きで取り付け、  白い斜線の部分から出ないように配線します。)
11
MG10/2

DISASSEMBLY PROCEDURE

(分解手順)
1. Bottom Case (Time required: About 1 minute)
1-1 Remove the five (5) screws marked [250] and the
two (2) screws marked [260]. The bottom case can then be removed. (Fig. 1)
Rear view
ACsupport
(サポートAC)
[260]
ACconnector
(ACコネクター)
Powerswitch
Top view
[280]
[270]
(電源スイッチ)
[280] [280] [280]
MAIN
1. ボトムケース(所要時間:約 1 分)
1-1 [250]のネジ5本と[260]のネジ2本を外し、ボトム
ケースを外します。(図1)
[260]
Bottomcase
[280]
(ボトムケース)
[250]
[ B ] x4
PushHPFbuttonx4
(ボタンHPF)
[ B ] x30
[250]
Hexagonalnutx21
(特殊六角ナット)
[250]
Metercover
(ウィンドウMETER)
PushPFLbutton
(ボタンPFL)
[ B ] x2
[250]
[ A ] [ A ]
[250]: Hex. Socket Tapping Screw-P 3X25 MFZNBL (V3289800) [260]: Bind Head Tapping Screw-B 3.0X8 MFZN2BL (EP600190) [270]: Bind Head Tapping Screw-S 3.0X6 MFZN2BL (EP630210) [280]: Bonding Tapping Screw-B 3.0X8 MFZN2BL (VN413300)
[250]
(6角孔付きボタンPタイト) (+バインドBタイト) (+バインドSタイト)
(ボンディングBタイト)
Topcover
(トップカバー)
12
Fig .1(図1)
MG10/2
ACsupport
2. AC Support (Time required: About 2 minutes)
2-1 Remove the bottom case. (See procedure 1.) 2-2 Remove the screw marked [270]. The AC support
can then be removed. (Fig. 1, Photo. 1)
3. MAIN Circuit Board (Time required: About 8 minutes)
3-1 Remove the bottom case. (See procedure 1.) 3-2 Remove the AC support. (See procedure 2.) 3-3 Remove the ten (10) screws marked [280], the
twenty-one (21) hexagonal nuts and the eight (8) level knobs marked [A]. The MAIN circuit board can then be removed. (Fig. 1)
The knobs, buttons and meter cover on the MAIN circuit board are not components of the circuit board. When replacing the MAIN circuit board, be sure to remove these parts according to the following procedure.
3-4 Remove the thirty-six (36) volume knobs marked [B],
the four (4) push HPF buttons and the push PFL button from the MAIN circuit board. (Fig. 1)
3-5 Remove the meter cover from the MAIN circuit board.
(Fig. 1)
4. Power Switch and AC Connector (Time required: About 2 minutes each)
4-1 Remove the bottom case. (See procedure 1.) 4-2 Remove the AC support. (See procedure 2.) 4-3 Remove the power switch by bending its claw from
the AC support. (Photo. 2)
4-4 Remove the hexagonal nut and the flat washer. The
AC connector can then be removed from the AC support. (Photo. 2)
2. サポート AC(所要時間:約 2 分)
2-1 ボトムケースを外します。(1項参照) 2-2 [270]のネジ1本を外し、サポートACを外します。
(図 1、写真1)
3. MAIN シート(所要時間:約 8 分)
3-1 ボトムケースを外します。(1項参照) 3-2 サポートAC を外します。(2項参照) 3-3 [280]のネジ 10 本と特殊六角ナット 21 個、[A]のノ
ブ(LEVEL)8個を外し、MAINシートを外します。
(図1)
  ※MAINシート上のノブ、ボタン、ウィンドウMETER
は、シートの構成部品ではありません。MAIN シー トを交換する際は、以下の手順でこれらの部品を取 り外してください。
3-4 MAIN シートから[B]のノブ(VR)3 6 個とボタン
(HPF)4個、ボタン(PFL)1個を外します。(図1)
3-5 MAIN シートからウィンドウMETER を外します。
(図 1)
4. 電源スイッチとACコネクター(所要時間:各約2分)
4-1 ボトムケースを外します。(1項参照) 4-2 サポートAC を外します。(2項参照) 4-3 電源スイッチのツメを曲げて、サポートACから電
源スイッチを外します。(写真 2)
4-4 特殊六角ナット1個と平ワッシャー1個を外して、サ
ポートACからACコネクターを外します。(写真2)
ACsupport
(サポートAC)
Hexagonalnut andflatwasher
(特殊六角ナット  と平ワッシャー)
ACconnector
(ACコネクター)
Claw
(ツメ)
Photo.2 (写真2)Photo.1 (写真1)
(サポートAC)
Powerswitch
(電源スイッチ)
Claw
(ツメ)
13
MG10/2

IC BLOCK DIAGRAM

NJM2068MD-T1 (XJ553A00)
MAIN: IC202, 302, 303, 402, 403, 501, 502, 601, 602, 701, 702, 802
NJM4558M (T1) (IG103520)
MAIN: IC103, 304, 404, 503, 603
Dual Operational Amplifier
+-
+DC Voltage
8
Supply
7
Output B Inverting
6
Input B Non-Inverting
5
Input B
1
Output A +V
Inverting
2
Input A
Non-Inverting
Input A
-DC Voltage Supply
+-
3
4-V
LB1412M (XT547A00)
MAIN: IC803, 805
LED Driver
(IC ブロック図)
NJM4580ED (XT157A00)
MAIN: IC101, 201, 301, 401, 801, 804
Dual Operational Amplifier
1
Output A +V Inverting
2
Input A
Non-Inverting
Input A Ground
3
4-V
+-
+-
8
7
6
5
+DC Voltage Supply
Output B Inverting
Input B Non-Inverting Input B
NJM4556AL
(XP844A00)
MAIN: IC806
Dual Operational Amplifier
+
-
1A2 3 4 5 6 7 8
OUTA-INA+INA+INB-INBOUT
+
B
-
-V +V B
OUT2
OUT1
VCC
VZ
13
RESET OSC ILED
14 1512
OSC
-
11
+
10
IN2
9
-
+
8
IN1
16
+
­+
-
-
+
­+
­+
­+
­+
­+
­+
­+
­+
­+
7
CURENT DRIVER
D1
17
18
D2
19
D3 D4
20
CURENT DRIVER
21
D5
D6
22
23 R S
Q
R
Q
S
Q
R
Q
S
Q
R
Q
S
Q
R
Q
S
Q
D7 D8
2
D9
3
D10
4
D11
5
D12
6
GND
OUT1
OUT2
RESET
1NC
2
D8
3
D9
D10
4
D11
5
D12
6
7
8
IN1
9
10
IN2
11
12
NC
24
D7
23
D6
22
D5
21
D4
20
D3
19
D2
18
17
D1
16
V
CC
15
I LED
14
OSC
13
V
Z
GND
14
MG10/2

CIRCUIT BOARD

MAIN Circuit Board
MIC
LINE
INSERT I/O
(シート基板図)
12
12
12
(MONO)
3/4 5/6
3 L
4 R 6 R
5 L
(MONO)
7 L
8 R
7 L
8 R
9 L
10 R
9 L
10 R
L
R
L
(MONO)
R
ST OUT C-R OUT
L
R
L
R
AUX1 (PRE)
AUX2
SENDRETURN
L
R
PHONES
GAIN
HPF
HIGH
MID
LOW
AUX
PAN
LEVEL
PEAK
1 2 3/4 5/6 7/8 9/10
PEAK
PEAK PEAK
PAN/BAL PAN/BAL
BAL BAL
PHANTOM
+48V
L
RETURN
ST
ST
2TR IN
C-R/PHONES ST
POWER
R
PEAK
+5 +3
+1 0
-1
-3
-5
-7
-10
-15
-20
Component side
Note: See parts list for details of circuit board component parts.
注:シートの部品詳細はパーツリストをご参照ください。
(部品側)
15
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