Yamaha SB168-ES Service Manual page 153

Q P O N
LD2 CIRCUIT DIAGRAM (SB168-ES)
1
2
3
4
5
6
+48 SIG PEAK +48
7
(Red) (Green) (Red) (Red)
8
INPUT 9 INPUT 10
LED current
+48 PEAK: 4mA
SIG: 9mA
9
10
11
12
24 28CC1-2001041873-3
M L K J
SIG PEAK +48 SIG PEAK +48
(Green) (Red) (Red) (Green) (Red) (Red)
INPUT 11
DTC123JKA (VY67760R) DTA143XKA (WE51640R)
DIGITAL TRANSISTOR
DIGTAL TRANSISTOR
LD2: TR300, TR305, TR310, TR315, LD2: TR301, TR303, TR306, TR308,
TR320, TR325, TR330, TR335 TR311, TR313, TR316, TR318,
TR321, TR323, TR326, TR328,
3 TR331, TR333, TR336, TR338
R OUT
1
2 IN
R
2
1
GND(+)
R1
OUT
IN OUT
IN
1: GND
R2 GND(+)
2: IN
GND
IN OUT
3: OUT
1: GND(+) 2: IN 3: OUT
GND
I H G
to DM-CN402
<Page 12: A-7>
SIG PEAK +48 SIG PEAK
(Green) (Red) (Red) (Green) (Red)
INPUT 12 INPUT 13
KTC3875S (WC52940R)
TRANSISTOR
LD2: TR302, TR304, TR307, TR309,
TR312, TR314, TR317, TR319,
TR322, TR324, TR327, TR329,
TR332, TR334, TR337, TR339
3
3
2
1
3
1
1: EMITTER
2
2
2: BASE
1 3: COLLECTOR
F E D C
+48 SIG PEAK +48 SIG PEAK
(Red) (Green) (Red) (Red) (Green) (Red)
INPUT 14 INPUT 15
LD2 CIRCUIT DIAGRAM (SB168-ES)
B A
SB168-ES
+48 SIG PEAK
(Red) (Green) (Red)
INPUT 16