Yamaha Audiogram 3 Service Manual page 43

H G
BLOCK DIAGRAM (AUDIOGRAM3)
JACK3 MIX3
COMBO
MIC A
[-60 to -16dBu]
INPUT1
MIC/INST
MIC B
[-60 to -16dBu]
SW101
INST
[-44 to 0dBu]
JK101
JK201
LINE L
[-34 to +10dBu]
JK203
INPUT2 JK202
LINE R
[-34 to +10dBu]
JK203
+30dBu
+20dBu
+10dBu
CH IN INST Gain: Min [0dBu]
0dBu
-10dBu
CH IN MIC Gain: Min [-16dBu]
-20dBu
-30dBu
CH IN INST Gain: Max [-44dBu]
-40dBu
-50dBu
CH IN MIC Gain: Max [-60dBu]
-60dBu
F E
PHANTOM (+48V)
Q103–106,
IC101 (8P)
[-6dBu]
HA
7
VR101
Level
IC301 (8P)
(Gain)
Hi-Z
SW101
[-6dBu]
[10 to 54dB]
6
SUM
7
Q101, Q102
2
SUM
1
IC201 (8P)
[-6dBu]
3
HA
1
Level VR201
(Gain)
[6 to 50dB]
VR201
5
HA
7
IC201 (8P)
POWER
PHANTOM
Clip Level Clip Level
ST CH IN LINE Gain: Min [+10dBu]
ST CH IN LINE Gain: Max [-34dBu]
D C
LD401,
LD402
L R
PEAK
SIGNAL
DR
Q401,
IC401 (8P),
IC402 (14P),
Q402
DR
Level
IC302 (8P)
(MASTER)
[-6dBu] [-12dBu] [-2dBu]
6
SUM BA
7 3 1
VR301 IC303 (8P)
2
SUM BA
1 5 7
Q501–503
MUTE
[-20dBu]
LPF
6 7
LIN
12
IC201 (8P)
RIN
13
LPF
2 1
[–6dBu] [-20dBu]
LPF
1 2
LO
16
IC202 (8P)
RO
15
LPF
7 6
LD502
OUT1
GR
OUT2
+5V
+5V
LD501
SW501
RE
IC601 (8P)
+48V +5V
DC-DC
6
+48V
Q501,
IC501 (8P)
-7.5V +5V
DC-DC
-7.5V
6
IC401 (8P)
+7.5V +5V
DC-DC
+7.5V
6
Level (MASTER)
[Nominal: -6dB]
B
AUDIOGRAM3
LD403, JACK3
LD404
RE
GR
JK302
L
Q504
JK301
STEREO OUT
[-2dBu]
JK303
R
Q505
JK301
JK304
PHONES
[0.5mW @ 40ohms]
Q506
Q507
USB
CN701
D-
2
D+
1
GND
4
USB +3.7V 5
REG
10
4
AUDIO
1
IC101 (5P)
IC102
3
Vbus (+5V)
(28P)
SSPND
28
20 21
X101
*S : Soldered
12MHz
IC301 (8P)
SW_IC IN
2
EN1
7
3
EN2
6 4
PSUSB
+30dBu
+20dBu
Clip Level
+10dBu
0dBu
STEREO OUT [-2dBu]
-10dBu
PHONES [0.5mW @ 40ohms] -20dBu
-30dBu
-40dBu
-50dBu
-60dBu
BLOCK DIAGRAM (AUDIOGRAM3)
A
1
2
3
4
5
3
6