JVC KS-FX901 Service Manual page 20

KS-FX901/KS-FX801
QQ
3 7 63 1515 0
CXA2560Q (IC401) : Dolby B type noise reduction system with play back equalizer amp.
1.Pin layout & Block diagram
30 29 28
7k/12k
PBFB2 31
PBRIN2 32
300k
-
PBGND 33
+
F2
PBFIN2 34
30k
VCT 35
45k
PBREF 36
30k
PBFIN1 37
F1
+
PBGND 38
-
300k
PBRIN1 39
7k/12k
PBFB1 40
1 2 3
2. Pin function
I/O
Pin No. Symbol
1 PBTC1
-
2 PBOUT1
O
TE
L 13942296513
3 OUTREF1
O
4 TAPEIN1
I
5 Vcc
-
6 NC -
7 LINEOUT1 O
8 TCH1 -
9 NC -
10 MSLPF -
11 G2FB -
12 G1FB -
13 MSTC -
14 MSOUT O
15 NC -
16 NRSW I
17 MUTESW I
18 TAPESW I
19 DRSW I
www
20 MSMODE I
21 MSSW I
22 NC -
23 TCH2 -
24 LINEOUT2 O
1-20
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27 26 25 24 23 22 21
NR
20
100k OFF/B
19
T2
MS MODE
x 1
BIAS
18
MUTE
17
TAPE EQ
NR MODE 16
FWD/RVS
15
Vcc
MS ON/
OFF
LPF
+
14
-
DET
F3
13
x 1
T1
12
OFF/B
100k
11
NR
4 5 6 7 8 9 10
Function
Playback equalizer amplifier
capacitance
Playback equalizer amplifier
output
Output reference
TAPE input
Power supply
Line output
Time constant for the HLS
Cut-off frequency adjustment
of the music sensor LPF
Music signal interval detection
Music signal interval detection
Time constant for detecting
music signal interval
Music sensor out
No use
Dolby NR control
Mute function control
Playback equalizer amplifier
control
Head select control
Music sensor mode control
x ao
Music sensor control
y
. i
Time constant for the HLS
Line output
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8
MSMODE
DRSW
TAPESW
MUTESW
NRSW
NC
MSOUT
MSTC
G1FB
G2FB
Pin No. Symbol
25 DIREF
26 GND
Q Q
27 TAPEIN2
3 6 7 1 3
28 OUTREF2
29 PBOUT2
30 PBTC2
31 PBFB2
32 PBRIN2
33 PBGND
34 PBFIN2
35 VCT
36 PBREF
37 PBFIN1
38 PBGND
39 PBRIN1
u163
40 PBFB1
.
2 9 9 4 2 8
I/O Function
- Resistance for setting the
reference
- Ground
I TAPE input
1 5 0 5 8 2 9 9 4
O Output reference
O Playback equalizer amplifier
output
- Playback equalizer amplifier
capacitance
I Playback equalizer amplifier
feedback
I Playback equalizer amplifier
input
- Playback equalizer amplifier
ground
I Playback equalizer amplifier
input
O Center
O Playback equalizer amplifier
reference
I Playback equalizer amplifier
input
- Playback equalizer amplifier
ground
m
I Playback equalizer amplifier
co
input
I Playback equalizer amplifier
feedback
9 9
2 8 9 9