JVC KS-FX711 Service Manual page 23

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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
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
2. Pin function
Pin No. Symbol
1 PBTC1
2 PBOUT1
TE
L 13942296513
3 OUTREF1
4 TAPEIN1
5 Vcc
6 NC
7 LINEOUT1
8 TCH1
9 NC
10 MSLPF
11 G2FB
12 G1FB
13 MSTC
14 MSOUT
15 NC
16 NRSW
17 MUTESW
18 TAPESW
19 DRSW
www
20 MSMODE
21 MSSW
22 NC
.
23 TCH2
24 LINEOUT2
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28 27 26 25 24 23 22 21
NR
100k
OFF/B
T2
MS MODE
1
BIAS
MUTE
TAPE EQ
NR MODE
FWD/RVS
Vcc
MS ON/
OFF
LPF +
-
DET
+
F3
-
1
T1
OFF/B
100k
NR
3 5 8 9 10
4 6 7
I/O Function
Playback equalizer amplifier
-
capacitance
Playback equalizer amplifier
O
output
Output reference
O
TAPE input
I
Power supply
-
-
Line output
O
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
O
No use
-
Dolby NR control
I
Mute function control
I
Playback equalizer amplifier
I
control
Head select control
I
Music sensor mode control
I
x ao
y
Music sensor control
I
-
i
Time constant for the HLS
-
Line output
O
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8
20 MSMODE
19 DRSW
18 TAPESW
MUTESW
17
NRSW
16
15 NC
14 MSOUT
MSTC
13
12 G1FB
11 G2FB
Pin No. Symbol
25 DIREF
26 GND
Q Q
27 3 6 7 TAPEIN2 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
.
KS-FX711/KS-FX511
2 9 9 4 2 8
I/O Function
- Resistance for setting the
reference
- Ground
1 5 0 5 8 2 9 9 4
I TAPE input
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
m
ground
I Playback equalizer amplifier
co
input
I Playback equalizer amplifier
feedback
9 9
2 8 9 9
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