Yamaha GX-900 Service Manual page 63

A B
BLOCK DIAGRAM
1
AUX 12
IN
1
AUX
TUNER 14
5
REC
TAPE 15
2
CD 11
4
2
4
9
TUNER
5,6
TAPE PB
CD
TAPE REC
LPF
MD
R 5 7
28
3 1
27
3 L IC3
26
IC5
25
R 1 3
24
7 5
23
L
22
IC4
21
5 6 9 8
20
19 50
18 Vd+6.5/5V
17
16
15
MDM-98A IC4
14
1 2
13 18
13 12
12
3 4
11 36
11 10
10 35
9
8 37
7 38
6 39
5 42
4
4
3
DIGITAL IN
2
1
Vd+6.5/5V
CB403
BACKUP
u5.6V
5 7 Q4
DIGITAL IN IC401 DSEL0
2
SW IC8 55
CD DSEL1
6 14
DIGITAL OUT IC8 56
16
Q401
+3.3V
CD CONTROL
5
DECK CONTROL
TUNER CONTROL
6
C
13 12
3 1 INPUT IC21
SWITCH 13 3 1
INPUT 14 IC4 3 5 7
SWITCH 5
IC3
9,10
Q31,32
IN2A,IN2B
IC8 64,65
9,10
Q29,30
INIA,IN1B
IC8 62,63
REC
3
SWITCH
8
IC5
12,13
Q5,7
RECB
IC8 67
Q6,15
IC8 66
RECA
MUTE
Q1,2
SYSCTL
34
SYSCK
33
SYSI
32
IC2 SYSO
31
M30624FG
/RES
12
13
XL1
15
/PDN
19 8MHz 32.768MHz
XL402 XL401
28
38 39 36 37 62 63 66
MDB
27
Q6
28
IC1
30
Q7 20
|
22
25
26
71
|
80
87
|
89
92
|
97
18,19,30,34 32 50
DECK CONTROL
U801
REMOCON
D E
HP AMP
IC10
49 21 MUTE 5 7
64 28 Q23.24 3 1
VOLUME LEVEL
CONTROL
GEQ
IC7
14 15
36 34
24 25 26
IC8 49,17,16
TUCE,TUDO,TUCLK
22 4 2
18 6 8
YMERSION
11
TONE.CONT.
12
IC814
13
23 24 19 20
BASS TREBLE
VR804 VR802
+12M
12V
-12V
-27V
9.0V
K9V
8
U5.6V
SPEANA
5.0V
IC26
10 - 13
THER
67 64 65 41 - 44 61 16 17 49 15 11
SMUTE 5.0V
59
AMPMUTE
24
IPRT 9.0V
90
SPON
58
PRON
57
SYSTEM CPU
HPIN
85
IC8
ACIN
29
48
49
13
12
|
13
16
51 81,82 4 - 8 83,84
MD
KEY CONT
VOL.
JOG
SW801-807,812-818
ROTARY ROTARY
820-824,826-836
ENCODE ENCODE
SW825 SW801
64
F
IC11
MUTE
3 1
Q21
SMUTE
IC8 59
MUTE
Q801
802
POWER AMP
IC201
MUTE
18 14
Q201
22 15
202
17
±HB
±LB
IC8 11
THER
AMPMUTE
IC8 24
IC8 90
PROTECTION
IPRT
SPON
IC8 58
RY201
u5.6V u5.6V
IC8 57
PRON
Q33
K9V K9V
D211
+HB
Q26 Q206
5.0V -27V -27V
Q25 Q204 -HB
9.0V 12V
+LB D212
12V
Q218
+12M +12M
-LB
Q207
-12V -12V
IC8 15
1 VPRT
| 1 FAC1
FL
12 FL DISPLAY 2
DRIVER
14
V801
IC815 FAC2
58
|
59
64
32
D213
MDB
CDB
VP
-27V
G H
GX-900
SW
OUT
5.0V
HP,IC8 85
HP JACK
JK803
TE201
RY201
+
-
SPEAKER
+
-
IC8 29
ACIN
T203
D215
SUBB
RY203
T202
F217
RY203
F201
65