Yamaha i88x Service Manual page 88

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i88X OVERALL CIRCUIT DIAGRAM 1/12 (DM 1/5)
001
DM
ANALOG Circuit block
Component Side
Digital Circuit block
FG2,FG3 and FG4 are solid pattern. (Component side, Pattern side)
RB160L-40(VS597600) 1SS82TD(IF005560)
DIODE DIODE
DM:D908,909
1
2
2
1 : ANODE
2 : CATHODE
NSQ03A04(WC125500) D1F60 (VS201100)
DIODE DIODE
DM:D904
1
2
2
1 : ANODE
2 : CATHODE
D1FS4A-4063(WA295200) 1SS355(VT332900)
DIODE DIODE
DM:D931
1
2
2
1 : ANODE
2 : CATHODE
i88X OVERALL CIRCUIT DIAGRAM 2/12 (DM 2/5)
PHANTOM
DM 002
+48V
ON
CH1
OFF MIC/LINE/Hi-Z
*SW2
(
CH2
*SW3
*SW3
LINE/MIC
CH3
COMMON
Negative phase connection
CH4
Negative phase connection
CH5
Negative phase connection
CH6
Negative phase connection
CH7
Negative phase connection
CH8
Negative phase connection
i88X
Not installed
Power Supply Circuit block
NSQ03A06(WC125300)
DIODE
DM:D901 DM:D902,903,910
1
To JK1-CN101
2
1
1 : ANODE 1 : ANODE
2 : CATHODE 2 : CATHODE
HSU119(V9599200)
DIODE
DM:D905-907 DM:D930
1
1
2
1 : ANODE 1 : ANODE
2 : CATHODE 2 : CATHODE
RB551V-30(V9634300)
DIODE
DM:D1,2,17-21 DM:D3,4,7-16,22-29
1 1
2
1 : ANODE 1 : ANODE
2 : CATHODE 2 : CATHODE
OP AMP
OP AMP
OP AMP
GAIN CH1
OP AMP
*SW2
GAIN CH2
OP AMP
to JK2-CN202
COMMON
A/D CONVERTER
GAIN CH3
OP AMP
OP AMP
GAIN CH4
A/D CONVERTER
OP AMP
OP AMP
GAIN CH5/6
A/D CONVERTER
OP AMP
OP AMP
GAIN CH7/8
REGULATOR
(VARIABLE)
REGULATOR
(VARIABLE)
REGULATOR +5V
DC/DC CONVERTER
Protection
D/A CONVERTER
PEAK CH1
A/D CONVERTER
CONVERTER
PEAK CH2
For Direct Connection Test
between AD and DA
NJM78L05UA(XJ598A00)
REGULATOR +5V
DM: IC37
1 2
1: OUTPUT
3
2: COMMON
3: INPUT
( F) : Metal Film Resistor
( ) : Mylar Capacitor
( ) : Flame Proof Resistor
( ) : Metal Oxide Film Resistor
Terminal for I/O confirmation without operating MLN2.
INVERTER
Soft Mute from CPU
Power-ON Hard Reset Mute
REGULATOR +9V
REGULATOR -9V
REGULATOR +5V
SI-8501L(XS346A00) NJM7909FA (XV872A00)
REGULATOR +5V REGULATOR -9V
DM:IC902
1 : Vout
2 : Soft start
1
switch 2
3
3 : GND
4 : Lin
6 : Vin
to JK3-CN301
Negative phase connection
OP AMP
OP AMP OP AMP
Negative phase
connection
MONITOR
REGULATOR
VOLUME
+5.0V
D/A
OP AMP
Negative phase
connection
D/A
CONVERTER
OP AMP
D/A
CONVERTER
OP AMP
D/A
CONVERTER
OP AMP
Note: See parts list for details of circuit board component parts.
i88X
BA09T(XU583A00)
REGULATOR +9V DM:IC904
DM:IC903 BA05T(X5183A00)
REGULATOR +5V DM:IC905
1 : COMMON
2 : INPUT
1: INPUT
3 : OUTPUT
2: COMMON
1
2 3: OUTPUT
3
( F) : Metal Film Resistor
( ) : Ceramic Capacitor
(
28CC1-8831036 2 1/5
CH1
OP AMP
OP AMP
CH2
PHONES
OP AMP
CH3
OP AMP
CH4
OP AMP
CH5
OP AMP
CH6
OP AMP
CH7
OP AMP
CH8
28CC1-8831036 4 2/5
i88X