JBL DSC 1000 Service Manual - page 33
5
5
4
4
3
3
2
2
1
1
D
D
C
C
B
B
A
A
AUTO SWITCH LOGIC
DETECT LOGIC
When the HP insert into the HP jack, the detect pin unconnect to
the channel R, and the detect level is 3.3V, amplifier will be
muted.
When the HP doesn't insert into the HP jack, the detect pin will
connect to the channel R, and the detect level is 0V, amplifier
will work normally.
1239C-PV1
3.3
DSC1000 MAIN BOARD 041011
B
11
22
Tuesday, November 30, 2004
Title
Size
Document Number
Rev
Date:
Sheet
of
Harman Kardon, Northridge, California 91329, USA
PHONE_R
PHONE_L
HPV5
+A12V
CN6
TO PHONEJACK STEREO SW
1
2
3
4
5
3R4
10R
3R3
680R
R136
0
3C1
1UF
3R1
20k 1%
CB90
104
EC45
47uF/16V
ESD2
AVR-M1608C270M*ABB
CB84
104
3C6
220uF/16V
3R2
10R
ESD1
AVR-M1608C270M*ABB
3C3
100uF/10V
R5
10k 1%
3R7
100k
3R8
1M
CB89
104
R120
3k
R81
3k
3C7
220uF/16V
FB8
FB 50R
CB92
104
3R5
20k 1%
3R10
20k 1%
3C2
1UF
3R6
20k 1%
3U2
LM4880M
1
2
3
4
5
6
7
8
AOUT
AIN
BYP
GND
SON
BIN
BOUT
VDD
R6
10k 1%
3R9
680R
C
B
E
4.7K
3
2
1
Q27
SMT3
DTC343TK
ROHM
C
B
E
4.7K
3
2
1
Q19
SMT3
DTC343TK
ROHM
Q18
2SK3018
2
1
3
U13
78L05
3
1
2
IN
OUT
GN
D
DETECT
HP_R
HP_L
AMUTE