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KS-FX850R/KS-FX835R/KS-FX820R
Descrption of major ICs
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
I/O
Pin No. Symbol
1
PBTC1
2
PBOUT1
O
3
OUTREF1
O
4
TAPEIN1
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
17
MUTESW
18
TAPESW
19
DRSW
20
MSMODE
21
MSSW
22
NC
23
TCH2
24
LINEOUT2
O
2-12
28
26
23
22
21
27
25
24
NR
100k
OFF/B
T2
MS MODE
x1
BIAS
MUTE
TAPE EQ
NR MODE
FWD/RVS
Vcc
MS ON/
OFF
LPF
+
-
DET
F3
x1
T1
OFF/B
100k
NR
3
5
8
9
10
4
6
7
Function
Playback equalizer amplifier
-
capacitance
Playback equalizer amplifier
output
Output reference
TAPE input
I
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
I
Mute function control
I
Playback equalizer amplifier
I
control
Head select control
I
Music sensor mode control
I
Music sensor control
I
-
Time constant for the HLS
-
Line output
20
MSMODE
19
DRSW
18
TAPESW
MUTESW
17
16
NRSW
15
NC
MSOUT
14
13
MSTC
12
G1FB
11
G2FB
Pin No.
Symbol
25
DIREF
26
GND
27
TAPEIN2
28
OUTREF2
29
PBOUT2
30
PBTC2
31
PBFB2
32
PBRIN2
33
PBGND
34
PBFIN2
35
VCT
36
PBREF
37
PBFIN1
38
PBGND
39
PBRIN1
40
PBFB1
I/O
Function
-
Resistance for setting the
reference
-
Ground
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
ground
I
Playback equalizer amplifier
input
I
Playback equalizer amplifier
feedback
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