JVC KD-S621 Service Manual page 24

TEA6320T-X (IC301) : E.volume
1.Pin layout
SCL
SDA 32
1
VCC
GND 31
2
OUTRR
OUTLR 30
3
OUTRF
OUTLF 29
4
TR
TL 28
5
B2R
B2L 27
6
B1R
B1L 26
7
IVR
IVL 25
8
ILR
ILL 24
9
QSR
QSL 23
10
IDR
IDL 22
11
Vref
MUTE 21
12
ICR
ICL 20
13
CD-CH
CAP
IMD 19
14
IBR
IBL 18
15
TAPE
IAR
IAL 17
16
TUNER
3.Pin functions
Pin
Symbol I/O
No.
Serial data input/output.
1
SDA I/O
Ground.
2 GND -
output left rear.
3
OUTLR O
output left front.
4
OUTLF O
Treble control capacitor left channel or
5 TL I
input from an external equalizer.
Bass control capacitor left channel or
6
B2L -
output to an external equalizer.
Bass control capacitor left channel.
7
B1L -
Input volume 1. left control part.
8 IVL I
Input loudness. left control part.
9
ILL I
Output source selector. left channel.
10
QSL O
Not used
11 IDL -
Not used
12
MUTE -
Input C left source.
13
ICL I
Not used
14 IMO -
15 Input B left source.
IBL I
Input A left source.
16
IAL I
2.Block diagram
10 8
21
31 POWER
SUPPLY
2
19
16
15
13
11
SOURCE
SELECTOR
14
+20 to -31 dB
22 LOUDNESS
20
18
17
23 25
Functions
5
9 7 6
VOLUME 1
BASS
TREBLE
+20 to -31 dB
LEFT
LEFT
LOUDNESS
+15 dB
+12 dB
LEFT
LOGIC
VOLUME 1
BASS
TREBLE
RIGHT
RIGHT
+15 dB
+12 dB
RIGHT
24 26 27 28
Pin
Symbol I/O
No.
17 I
IAR Input A right source.
I
18
IBR Input B right source.
-
19
CAP Electronic filtering for supply.
20 I
ICR Input C right source.
-
21
Vref Reference voltage (0.5Vcc)
-
22
IDR Not used
23 O
QSR Output source selector right channel.
I
24
ILR Input loudness right channel.
I
25
IVR Input volume 1. right control part.
26 -
B1R Bass control capacitor right channel
Bass control capacitor right channel or
27 O
B2R
output to an external equalizer.
Treble control capacitor right channel or
I
28
TR
input from an external equalizer.
29 O Output right front.
OUTRF
30 O Output right rear.
OUTRR
- Supply voltage.
31
Vcc
32 I Serial clock input.
SCL
12
VOLUME 2
MUTE
0 to 55 dB
FUNCTION
BALANCE
ZERO CROSS
FENDER REAR
DETECTOR
VOLUME 2
0 to 55 dB
BALANCE
FENDER FRONT
HC BUS
REC
VOLUME 2
0 to -55dB
BALANCE
FENDER FRONT
VOLUME 2
0 to -55dB
BALANCE
FENDER REAR
Functions
KD-S621
3
4
32
1
29
30
1-25