Yamaha Mg12.4 Service Manual

							ABCDE FGH ABCDE FGH
1
2
3
4
5
6
MG12/4
MG16/4
7
to JACK 1/2-CND71   (to P.10-E2)
OP AMP
OP AMP
OP AMP
OP AMP
OP AMP
OP AMPOP AMP
OP AMP
OP AMP
OP AMP OP AMP
OP AMP
OP AMP
OP AMPOP 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 P.8-A3)
(to P.8-A4)
(to P.8-E2)
(to P.8-E3)
(to P.8-E3)
(to P.8-E4)
(to P.8-E4)
MG12/4 CH9(L)/CH10(R)
MG16/4 CH13(L)/CH14(R)
MG12/4 CH11(L)/CH12(R)
MG16/4 CH15(L)/CH16(R)

 OVERALL CIRCUIT DIAGRAM 4/8 MAIN
28CC1-8834988-4
 : Ceramic Capacitor
Note : See parts list for details of circuit board component parts.
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							ABCDE FGH
ABCDE FGH
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)
(from P.7-H2)
(from P.8-A4)
(from P.4-H2)
(from P.5-H2)
(from P.7-H2)
(from P.8-D3)
(from P.8-D3)
(from P.7-H4)
(from P.7-H4)
OP AMP
OP AMPOP AMP
OP AMP
OP AMP OP AMP OP AMP
OP AMP
OP AMP
OP AMP
OP AMP
OP AMP
LED DRIVER
LED DRIVER
to JACK 1/2-CNG71   (to P.10-F1)
OP AMP
OP AMP
OP AMP
OP AMP
to JACK 2/2-CNH02   (to P.10-G5)
to JACK 1/2-CNE71   (to P.10-F4)
to PS-CN02   (to P.11-G2)
(to P.8-E3)
(to P.8-E4)
OP AMP OP AMP
OP AMP
OP AMP
OP AMPOP AMP
OP AMP
OP AMP OP AMP
OP AMP
(from P.4-H1)
(from P.5-H2)
(from P.6-H2)
(from P.7-H2)
(from P.4-H2)
(from P.5-H2)
(from P.6-H3)
(from P.7-H2)
(from P.8-E3) (from P.4-H1)
(from P.5-H1)
(from P.6-H2)
(from P.7-H1)
(from P.4-H1)
(from P.5-H1)
(from P.6-H2)
(from P.7-H2)
(to P.8-E1)
(to P.8-E2)
 OVERALL CIRCUIT DIAGRAM 5/8 MAIN
28CC1-8834988-6 28CC1-8834988-5
Note : See parts list for details of circuit board component parts.
 : Ceramic Capacitor : Mylar Capacitor : Flame Proof Carbon Resistor
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							ABCDE FGH ABCDE FGH
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 for details of circuit board component parts.
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							ABCDE FGH
ABCDE FGH
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
RST OUT R
C-R OUT
ST OUT L
1
2GROUP OUTAUX1
AUX2SEND
PHONES
JACK  2/2
JACK  1/2

 OVERALL CIRCUIT DIAGRAM 7/8 JACK 1/2, JACK 2/2
 : Ceramic Capacitor : Flame Proof Carbon Resistor
Note : See parts list for details of circuit board component parts.28CC1-8834990-2
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							ABCDE FGH ABCDE FGH
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
ZZ
Z
to MAIN-CNF01   (to P.8-D5)

 OVERALL CIRCUIT DIAGRAM 8/8 PS
KIA7815API(X4930A00)
REGULATOR +15V
PS: IC01
KIA7915PI(X4931A00)
REGULATOR -15V
PS: IC02
KIA7805API/P(X4928A00)
REGULATOR +5V
PS: IC05
KIA7812API(X4153A00)
REGULATOR +12V
PS: IC03
1: INPUT
2: GND
3: OUTPUT 1: INPUT
2: GND
3: OUTPUT 1: COMMON
2: INPUT
3: OUTPUT 1: INPUT
2: GND
3: OUTPUT
1
2
3
1
2
3
1
2
3
1
2
3
WARNINGComponents having special characteristics are marked 
Z and must be
replaced with parts having specification equal to those originally installed.
 : Ceramic Capacitor28CC1-8834992
Note : See parts list for details of circuit board component parts.
Z
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