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MG10/2
MIXING CONSOLE
SERVICE MANUAL
CONTENTS
SPECIFICATIONS ................................................ 3/5
DIMENSIONS ............................................................ 7
PANEL LAYOUT ..................................... 8
CIRCUIT BOARD LAYOUT & WIRING
............................................ 11
DISASSEMBLY PROCEDURE ............................ 12
IC BLOCK DIAGRAM .................................. 14
CIRCUIT BOARD ......................................... 15
INSPECTIONS ....................................................... 17/21
PARTS LIST
BLOCK DIAGRAM & LEVEL DIAGRAM
OVERALL CIRCUIT DIAGRAM
PA 011679 HAMAMATSU, JAPAN 1
200306-14800 Copyright (c) Yamaha Corporation. All rights reserved. PDF-K135 '03.04
MG10/2
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 already 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
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, 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 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
accumulated by grounding yourself to the ground bus in the unit (heavy gauge black wires connect to
this bus.)
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 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:
BLUE : NEUTRAL
BROWN : LIVE
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.
WARNING
Components having special characteristics are marked and must be replaced with parts having specification equal to those
originally installed.
2
MG10/2
SPECIFICATIONS
General Specifications
Frequency Characteristics (ST OUT) 20 Hz20 kHz +1 dB, 3 dB @+4 dBu, 10 k (with gain control at maximum level)
0.1 % (THD+N) @+14 dBu, 20 Hz20 kHz, 10 k (with gain control at maximum level)
Total Harmonic Distortion (ST OUT)
(CHs 1 and 2)
128 dBu Equivalent input noise (CHs 1 and 2)
100 dBu Residual output noise (ST OUT)
ST, Master fader at nominal level and all Ch at minimum
87 dBu (91 dB S/N)
Hum and Noise1 level.
85 dBu (89 dB S/N) All channel mix controls at minimum level.
ST, Master fader and one Ch fader at nominal level.
64 dBu (68 dB S/N)
(CHs 1 and 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
Maximum Voltage Gain 2 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
Monaural/Stereo Input Gain Control 44 dB variable
Monaural/Stereo High Pass Filter 80 Hz 12 dB/octave
70 dB between input channels
Crosstalk (1 kHz)
70 dB between input/output channels (CHs 1 to 6)
±15 dB
Monaural/Stereo Input Channel Equalization: HIGH 10 kHz shelving
Max. Variation3 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 sig-
Monaural/Stereo Input Peak Indicator
nal 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
Level Meters
+5, +3, +1, and 0 points: yellow indicators
1, 3, 5, 7, 10, 15, 20: green indicators
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)
USA and Canada: 120 V AC, 60 Hz
Europe: 230 V AC, 50 Hz
Power Supply
Australia: 240 V AC, 50 Hz
Korea: 220 V AC, 60 Hz
Power Consumption 19 W
Max. Dimensions (W × H × D) 251 × 65 × 290.5 mm
Weight 1.8 kg
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, 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 Input Appropriate Sensitivity* Rated Level Max. Before Connector
Impedance Impedance Clipping Specifications
72 dBu 60 dBu 40 dBu
60 (0.195 mV) (0.775 mV) (7.75 mV)
MIC INPUT 3 k 50600 mic XLR-3-31 type (balanced)
(CH 1-2)
16 28 dBu 16 dBu +4 dBu
(30.9 mV) (123 mV) (1.23 V)
34 46 dBu 34 dBu 14 dBu
(3.88 mV) (15.5 mV) (155 mV) Phone jack (TRS)
LINE INPUT 10 k 600 line (balanced [T: hot; R: cold;
(CH 1, 2) S: ground])
2 dBu +10 dBu +30 dBu
+10 (0.616 V) (2.45 V) (24.5 V)
60 72 dBu 60 dBu 40 dBu
(0.195 mV) (0.775 mV) (7.75 mV)
ST CH MIC INPUT 3 k 50600 mic XLR-3-31 type (balanced)
(CH3/CH4,CH5/CH6)
28 dBu 16 dBu 10 dBu
16 (30.9 mV) (123 mV) (245 mV)
46 dBu 34 dBu 14 dBu
34 (3.88 mV) (15.5 mV) (155 mV)
ST CH LINE INPUT
(CH3(L)/CH4(R), 10 k 600 line Phone jack (unbalanced)
CH5(L)/CH6(R)) 2 dBu +10 dBu +30 dBu
+10 (0.616 V) (2.45 V) (24.5 V)
ST CH INPUT
22 dBu 10 dBu +10 dBu Phone jack (unbalanced);
(CH7(L)/CH8(R), 10 k 600 line (61.6 mV) (245 mV) (2.45 V) RCA pin jack
CH9(L)/CH10(R))
Phone jack (TRS)
CH INSERT IN 20 dBu 0 dBu +20 dBu
(CH 1, 2) 10 k 600 line (77.5 mV) (0.775 V) (7.75 V)
(unbalanced [T: out; R: in;
S: ground])
12 dBu +4 dBu +24 dBu Phone jack (TRS) (unbalanced
AUX RETURN (L, R) 10 k 600 line (195 mV) (1.23 V) (12.3 V) [T: hot; S: ground])
26 dBV 10 dBV +10 dBV
2TR IN (L, R) 10 k 600 line (50.1 mV) (316 mV) (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 Appropriate Max. Before
Output Connectors Rated Level Connector Specifications
Impedance Impedance Clipping
Phone jack (TRS)
ST OUT (L, R) 150 10 k line +4 dBu (1.23 V) +20 dBu (7.75 V) (impedance balanced [T: hot; R: cold; S:
ground])
Phone jack (TRS)
AUX SEND (1, 2) 150 10 k line +4 dBu (1.23 V) +20 dBu (7.75 V) (impedance balanced [T: hot; R: cold; S:
ground])
CH INSERT OUT (CH 1, 2) 150 10 k line 0 dBu (0.775 V) +20 dBu (7.75 V) Phone jack (TRS) R: in; S: ground])
(unbalanced [T: out;
REC OUT (L, R) 600 10 k line 10 dBV (316 mV) +10 dBV (3.16 V) RCA pin jack
Phone jack (TRS)
C-R OUT (L, R) 150 10 k line +4 dBu (1.23 V) +20 dBu (7.75 V) (impedance balanced [T: hot; R: cold; S:
ground])
PHONES 100 40 phone 3 mW 75 mW Stereo phone jack
Where 0 dBu = 0.775 V and 0 dBV= 1 V
4
MG10/2
ST OUT 20 Hz 20 kHz +1 dB, 3 dB @+4 dBu 10 k GAIN
0.1 % THD+N @+14 dBu, 20 Hz 20 kH 10 k GAIN
ST OUT
(CH1 2)
128 dBu (CH1 2)
100 dBu (ST OUT)
ST
87 dBu 91 dB S/N
& *1
85 dBu 89 dB S/N
ST 1
64 dBu 68 dB S/N
(CH1 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
*2
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
44 dB
80 Hz 12 dB/octave
70 dB
(1 kHz)
70 dB (CH1 6)
±15 dB
HIGH 10 kHz
*3 MID 2.5 kHz
LOW 100 Hz
MIC ST CH
3 dB
12 LED 2 L R
+5 +3 +1 0
1 3 5 7 10 15 20
+48 VDC PHANTOM +48 V ON
(PA-10)
BMS-10A
100 V AC 50/60 Hz
19 W
W H D W251 H65 D290.5 mm
1.8 kg
0 dBu = 0.775 V 0 dBV = 1 V
*1 Rs = 150 ohms
@12.7 kHz 6 dB/oct.
@20 kHz dB/oct.
CH MIC INPUT to ST AUX EFFECT SEND
*2 PAN/BAL
*3 / 3 dB
5
MG10/2
*1
MIC INPUT 3k 50 600 72 dBu 60 dBu 40 dBu
60
(CH1-2 0.195 mV 0.775 mV 7.75 mV XLR-3-31
28 dBu 16 dBu +4 dBu
16
30.9 mV 123 mV 1.23 V
LINE INPUT 10 k 600 46 dBu 34 dBu 14 dBu
34
(CH1 2) 3.88 mV 15.5 mV 155 mV TRS
2 dBu +10 dBu +30 dBu T
+10 0.616 V 2.45 V 24.5 V R:
S
ST CH MIC INPUT 3k 50 600 72 dBu 60 dBu 40 dBu
60
(CH3/CH4 CH5/CH6) 0.195 mV 0.775 mV 7.75 mV XLR-3-31
28 dBu 16 dBu 10 dBu
16
30.9 mV 123 mV 245 mV
ST CH LINE INPUT 10 k 600 46 dBu 34 dBu 14 dBu
34
(CH3(L)/CH4(R) 3.88 mV 15.5 mV 155 mV
CH5(L)/CH6(R)) 2 dBu +10 dBu +30 dBu
+10
0.616 V 2.45 V 24.5 V
ST CH INPUT 10 k 600 22 dBu 10 dBu +10 dBu
(CH7(L)/CH8(R) 61.6 mV 245 mV 2.45 V
CH9(L)/CH10(R)) RCA
CH INSERT IN 10 k 600 20 dBu 0 dBu +20 dBu
(CH1 2) 77.5 mV 0.775 V 7.75 V TRS
T R
S
AUX RETURN (L R) 10 k 600 12 dBu +4 dBu +24 dBu
195 mV 1.23 V 12.3 V TRS
T:
S:
2TR IN (L R) 10 k 600 26 dBV 10 dBV +10 dBV
RCA
50.1 mV 316 mV 3.16 V
0 dBu=0.775 V 0 dBV=1 V
*1
ST OUT (L R) 150 10 k +4 dBu 1.23 V +20 dBu 7.75 V TRS
T R:
S:
AUX SEND (1 2) 150 10 k +4 dBu 1.23 V +20 dBu 7.75 V TRS
T R:
S:
CH INSERT OUT 150 10 k 0 dBu 0.775 V +20 dBu 7.75 V TRS
(CH1 2) T:
R S:
REC OUT (L R) 600 10 k 10 dBV 316 mV +10 dBV 3.16 V RCA
C-R OUT (L R) 150 10 k +4 dBu 1.23 V +20 dBu 7.75 V TRS
T R:
S:
PHONES 100 40 3 mW 75 mW
0 dBu=0.775 V 0 dBV=1 V
6
MG10/2
DIMENSIONS
65
251
290.5
Units: mm
7
MG10/2
PANEL LAYOUT
Channel Control Section
Channels Channels Channels
1 and 2 3/4 and 5/6 7/8 and 9/10
(Monaural) (Stereo) (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
1
2
3
4
5
6
7
Master Control Section
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
1
2
3
4
5
6
7
8
MG10/2
Input/Output Section
1 Channel Input Jacks (CHs 1, 2, 3/4, 5/6) 1
2 [INSERT I/O] Jacks (CHs 1, 2) 2
3 Channel Input Jacks (CHs 7/8, 9/10) 3
4 [2TR IN] Jacks 4
5 [REC OUT] (L, R) Jacks 5
6 [ST OUT] (L, R) Jacks 6
7 [C-R OUT] Jacks 7
8 [SEND] Jacks 8
9 [RETURN] L (MONO), R Jacks 9
10 [PHONES] Jack 10
Rear Section
1 [AC ADAPTOR IN] Connector
2 POWER Switch
1
2
9
MG10/2
Connector Polarities
INPUT OUTPUT
Pin 1: Ground
MIC INPUT Pin 2: Hot (+)
Pin 3: Cold ()
LINE INPUT (monaural channels), Tip: Hot (+)
ST OUT, C-R OUT, Ring: Cold ()
AUX1, AUX2* Sleeve: Ground
Ring
Tip: Output
INSERT I/O Ring: Input
Sleeve: Ground
Sleeve Tip
Tip: L
PHONES Ring: R
Sleeve: Ground
RETURN, Tip: Hot
LINE INPUT (stereo channels) Sleeve: Ground
Sleeve Tip
* These jacks will also accept connection to monaural phone plugs. If you use monaural plugs, the connection will be unbalanced.
INPUT OUTPUT
1
MIC INPUT 2 +
3
LINE INPUT +
ST OUT C-R OUT
AUX 1 AUX 2
Output
INSERT I/O Input
L
PHONES R
RETURN
LINE INPUT
10
MG10/2
CIRCUIT BOARD LAYOUT & WIRING
Rear view
Right side view
Top view
MAIN
Power switch and AC connector wiring
(V975620) (Connector assembly 2P BROWN, RED)
Need twist of one rotation. Wiring to MAIN circuit board
Cable Colors
Need twist of
one rotation.
RED
RED
RED
BROWN
V9737300 (MAIN circuit board) V998150 BLACK BROWN
(Connector assembly 3P
BROWN, RED, BLACK) (V998150) is soldering on solder side.
Cable Tie
Shrink Tube
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.
WB071100 (Shrink tube: Seven places) VV104600 (Cable Tie)
Bundle the four cables connected to power switch
by the cable tie and pull to left side.
11
MG10/2
DISASSEMBLY PROCEDURE
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
[270]
[260] [260]
MAIN
Top view
[280] [280] [280] [280] [280]
[250]
[250]
[ B ] x4
[ B ] x30
[ B ] x2
[250]
[250]
[A] [250] [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)
Fig .1
12
MG10/2
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)
Photo.1 Photo.2
13
MG10/2
IC BLOCK DIAGRAM
NJM2068MD-T1 (XJ553A00) NJM4580ED (XT157A00) NJM4556AL (XP844A00)
MAIN: IC202, 302, 303, 402, 403, 501, 502, MAIN: IC101, 201, 301, 401, 801, 804 MAIN: IC806
601, 602, 701, 702, 802 Dual Operational Amplifier Dual Operational Amplifier
NJM4558M (T1) (IG103520)
MAIN: IC103, 304, 404, 503, 603
Dual Operational Amplifier
Output A 1 +V 8
+DC Voltage Output A 1 +V 8
+DC Voltage
Supply Supply
+
+
Inverting Inverting A B
2 7 Output B 2 7 Output B - -
Input A - + Input A - +
Non-Inverting 3 6
Inverting Non-Inverting 3 6
Inverting
Input A + - Input B Input A + - Input B 1 2 3 4 5 6 7 8
-DC Voltage Supply 4 -V 5 Non-Inverting Ground 4 -V 5 Non-Inverting
Input B Input B OUT -IN +IN -V +IN -IN OUT +V
A A A B B B
LB1412M (XT547A00)
MAIN: IC803, 805
LED Driver
VZ RESET OSC ILED
13 12 14 15
OSC
- CURENT
OUT2 11 + DRIVER
-
+ 17 D1
NC 1 24 NC
-
+- + 18 D2 D8 2 23 D7
IN2 10
- D9 3 22 D6
+ 19 D3
OUT1 9 D10 4 21 D5
- CURENT 20 D4
+- + DRIVER
IN1 8 D11 5 20 D4
-
+ 21 D5
D12 6 19 D3
-
22 D6 GND 7 18 D2
+
23 D7 IN1 8 17 D1
R
-
+ SQ 2 D8
OUT1 9 16 VCC
RQ
- D9 IN2 10 15
+ SQ 3 I LED
RQ 11
VCC 16 - OUT2 14 OSC
+ SQ 4 D10
RQ RESET 12 13 VZ
- D11
+ SQ 5
RQ
- D12
+ SQ 6
7
GND
14
MG10/2
CIRCUIT BOARD
MAIN Circuit Board
ST OUT C-R OUT
7L 9L L L L L
MIC 1 2 3/4 5/6
8R 10 R R R
R R
3L 5L L AUX1
LINE 1 2 (MONO) (MONO) 7L 9L (MONO) (PRE)
PHONES
INSERT I/O 1 2 4R 6R 8R 10 R R AUX2
RETURN SEND
GAIN
PEAK PEAK PEAK PEAK
HPF
PHANTOM
+48V POWER
HIGH
L
R
PEAK
+5
MID +3
RETURN +1
ST 0
-1
LOW -3
-5
ST
-7
AUX -10
-15
PAN/BAL PAN/BAL BAL BAL 2TR IN -20
PAN
LEVEL
1 2 3/4 5/6 7/8 9/10 C-R/PHONES ST
Component side
Note: See parts list for details of circuit board component parts.
15
MG10/2
MAIN Circuit Board
Pattern side
16
MG10/2
INSPECTIONS
1. Scope
This inspection specification is applied to the mixer MG10/2.
2. Power Supply
AC Adaptor shall be used.
V981040(H:230V 50Hz) or V981030(U:120V 60Hz), V981220(B:230V 50Hz), V981680(K:220V 60Hz),
V986200(A:240V 50Hz)
3. Power Indicator Inspection
POWER LED shall light when the unit is turned on.
4. Mixer Section Inspection
4.1 Preparation
The load resistances for each output terminals are as follows,
PHONES (L/ R): 40 ohms
Others: 10 kohms
Unless otherwise specified, the operation elements shall be set as follows,
·CH (1-2) INPUT
H·P·F switch OFF
GAIN Trim MAX(-60dBu)
HI, MID, LO EQ Gain control CENTER
AUX Level control PRE(turned counterclockwise fully)
PAN control L(turned counterclockwise fully)
CH VR MAX
·ST CH (3/4, 5/6, 7/8, 9/10)
GAIN Trim MIC: MAX(-60dBu)
LINE: MAX(-34dBu)
HI, MID, LO EQ Gain control CENTER
AUX Level control PRE(turned counterclockwise fully)
BAL control L(turned counterclockwise fully)
CH VR MAX
·MASTER control
STEREO Master VR MAX
AUX RETURN Level control MAX
2TR IN Level control MAX
C-R/PHONES Level control MAX
·Others
PHANTOM switch OFF
4.2 Gain
The output levels shall be within the range specified in the Table 4.2.1-4.2.6.
Table 4.2.1 CH INPUT(1, 2) [dBu]
INPUT
INPUT Gain ST L OUT ST R OUT AUX1 AUX2 C-R OUT L C-R OUT R
Level
q Mic -72 Max 0 ± 2 *1 0 ± 2 *1 -1 ± 2 +5 ± 2 *2 +16 ± 2 *1 +16 ± 2 *1
-28 Min +1 ± 2 *1
Line -46 Max 0 ± 2 *1
1 Measure with the PAN control set at the center position. For others, turn the PAN control counterclockwise fully for the
ST L and turn it clockwise fully for the ST R.
2 Measure with the AUX Level control set at the POST (turn the AUX Level control clockwise fully) position.
17
MG10/2
Table 4.2.2 [dBu]
INSERT OUT
INPUT INPUT Level Gain REC OUT L REC OUT R
1-4/8
Mic 1, 2 -72 Max -12 ± 2
CH INSERT IN 1 0 Unspecified +4.2± 2 +4.2± 2
CH INSERT IN 2 0 Unspecified +4.2± 2
Table 4.2.3 Input Terminal STEREO IN [dBu]
INPUT INPUT CH INPUT Level Gain ST L OUT ST R OUT AUX1 AUX2
-72 Max 0±2 *1 0±2 *1 +1±2 +7±2 *2
Mic
w -28 Min +1±2 *1
e 3,5L +1±2 *1 +1±2 +7±2 *2
PHONE JACK -46 Max
r 4,6R +1±2 *1 -5±2 +1±2 *2
Table 4.2.4 Input Terminal STEREO IN [dBu]
INPUT INPUT CH INPUT Level ST L OUT ST R OUT AUX1 AUX2
t PHONE JACK 7,9L +4±2
-2±2 +4±2 *2
y 8,10R
-22
+4±2
u PIN JACK
7,9L +4±2
i 8,10R +4±2
Table 4.2.5 Input Terminal RETERN L,R [dBu]
INPUT INPUT Level ST L OUT ST R OUT
o L/MONO
-8
+4±2 +4±2
!0 R +4±2
Table 4.2.6 Input Terminal 2TR IN L,R [dBu]
INPUT INPUT Level ST L OUT ST R OUT C-R OUT L C-R OUT R PHONES L PHONES R
!1 L -12±2 +4±2 -7.5±2
-35.8
!2 R -12±2 +4±2 -7.5±2
4.3 Frequency Characteristics
In the signal routes of the Table 4.2.1 to 4.2.6 indicated with q to !2, 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 within the range of 0 dB +1.0/ -4.5 dB compared to the 1kHz (0dB).
In the route q, check every OUT when the signal is fed to CH1, and check only the ST L OUT when the signal is fed to
CH2 and other channels.
In the route r, check only the ST L OUT and the ST R OUT.
4.4 HPF
In the state of the Table 4.2.1 and 4.2.2, feeding 80 Hz -36dBu signal, and setting the GAIN to MIN, the STEREO L OUT
level obtained when the 80 switch is set to ON shall be within the range of -3 dB +2/ -2 dB compared to the level obtained
when the switch is set to OFF.
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MG10/2
4.5 Channel Equalizer Characteristics
In the state checked in 4.2 above, check the output level obtained at ST L OUT in the case of CH INPUT and ST CH INPUT
L and at ST R OUT in the case of ST CH INPUT R when LO, HI and MID of INPUT are moved respectively.
Its level of each frequency shall be within the range specified in the table 4.5.1 compared to the output level obtained when
the EQ gain control is center click position.
If it is without the range, search the frequency, within the range of ±20%, of that the level is within the range of Table 4.5.1.
Table 4.5.1 [dB]
EQ control EQ GAIN Applied frequency Variation width
MAX +12±2
HI 10kHz
MIN -12±2
MAX +15±2
MID 2.5kHz
MIN -15±2
MAX +12±2
LO 100Hz
MIN -12±2
4.6 Crosstalk
Setting the VR to the nominal position, and turning the PAN control (BAL control in the case of ST CH INPUT)
counterclockwise fully, the level of the leakage to ST R OUT shall be -50dBu or less when the output level of ST L OUT is
+20dBu.
Also turning the PAN control clockwise fully, the level of the leakage to ST L OUT shall be -50dBu or less when the output
level of ST R OUT is +20dBu.
In measuring the CH7 to CH10, the level of the leakage to ST OUT shall be -34dBu or less.
4.7 PEAK LED light-up level
In the state 4.1, each LED shall light-up when a signal specified as below is fed to the MIC input.
Table 4.7.1 [dBu]
INPUT PEAK LED
MIC -43±2
4.8 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".
4.9 Distortion Factor
In the signal routes of the Table 4.2.1 to 4.2.6 indicated with q to !2 (except e, r), set the VR of INPUT and MASTER to
the Nominal Position, and set the GAIN to the position specified in the Table (except PHONES).
Then, feeding each 20Hz, 1kHz and 20kHz signal, the distortion shall be less than 0.1%, when the output signal level is
+14dBu.
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 q, check every OUT when the signal is fed to CH1, and check only the ST L OUT when the signal is fed to
CH2 and other channels.
In the route w, turning the PAN/BAL control to L fully, the distortion shall be less than 0.1%, when the ST L OUT signal
level is +4dBu.
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MG10/2
4.10 Maximum Output
In the state 4.9, the distortion factor shall be less than 1% when the output level is +20dBu at ST L OUT, ST R OUT, AUX1
OUT, AUX2 OUT and C-R OUT.
The distortion factor shall be less than 1% when the output level is +7.5dBu at PHONES (L/R).
In measuring the ST L OUT, the ST R OUT, set the PAN or BAL Control to L or R fully respectively.
In measuring the C-R OUT and PHONES, set the C-R/PHONE Control to MAX.
4.11 Equivalent Input Noise
In the state 4.1, shunt the CH INPUT MIC terminal with 150 ohms, the noise level obtained at ST L OUT shall be less than -52dBu.
If it is over than -52dBu, calculate the input converted noise level (= noise level - channel gain) and it shall be less than -128dBu.
Shunt the ST INPUT MIC terminal with 150 ohms, the noise level obtained at ST L OUT shall be less than -48dBu.
If it is over than -48dBu, calculate the input converted noise level (= noise level - channel gain) and it shall be less than -124dBu.
4.12 Residual Noise
In the state 4.1, set the Level Control of all input CH to MIN.
Then when the MASTER VR set to the MAX or MIN position, the noise level shall be less than the level specified in the
Table 4.12.1.
When measuring the AUX OUT, set the all CH AUX Level control to CENTER.
When measuring the C-R OUT and the PHONES, set the ST VR to MIN.
Table 4.12.1 [dBu]
VR STEREO OUT AUX OUT C-R OUT
MAX -81.0 -85.0 -87.0
MIN -100.0 -93.0
4.13 Phase
In the state 4.1, the phase of the input signal and the output signal shall be the same.
But the INSERT OUT signal shall be the reverse.
When a signal is fed to the INSERT IN, the phase of the output signal shall be the reverse.
4.14 PHANTOM
Connect a 10k 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.
4.15 Stability
Shunt the output terminal with the capacitance of 10pF-0.1microF respectively. Then, the unit shall not oscillate.
Shunt the all input terminals with 150 ohms, and set the all VR and EQ Control to MAX.
Then, the unit shall not oscillate.
4.16 Primary Voltage Tolerance
The unit shall work normally with the primary voltage of ±10%.
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MG10/2
INPUT
INPUT Gain ST L OUT ST R OUT AUX1 AUX2 C-R OUT L C-R OUT R
Level
q Mic -72 Max 0 ± 2 *1 0 ± 2 *1 -1 ± 2 +5 ± 2 *2 +16 ± 2 *1 +16 ± 2 *1
-28 Min +1 ± 2 *1
Line -46 Max 0 ± 2 *1
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MG10/2
INSERT OUT
INPUT INPUT Level Gain REC OUT L REC OUT R
1-4/8
Mic 1, 2 -72 Max -12 ± 2
CH INSERT IN 1 0 Unspecified +4.2± 2 +4.2± 2
CH INSERT IN 2 0 Unspecified +4.2± 2
INPUT INPUT CH INPUT Level Gain ST L OUT ST R OUT AUX1 AUX2
-72 Max 0±2 *1 0±2 *1 +1±2 +7±2 *2
Mic
w -28 Min +1±2 *1
e 3,5L +1±2 *1 +1±2 +7±2 *2
PHONE JACK -46 Max
r 4,6R +1±2 *1 -5±2 +1±2 *2