Description Of Major Ics - JVC FS-SD550R Service Manual

FS-SD550R/FS-SD770R/FS-SD990R

Description of major ICs

BD3861FS-X (IC501) : Audio sound control
1. Pin layout
32
1
2. Block diagram
32 31 30
0dB~
-70dB
Vcc/2
Vcc/2
Vcc/2
25k 25k 25k
25k 25k 25k
1 2 3
3. Pin function
Pin
Symbol
No.
1 A1 CH1 input pin A
2 A2 CH2 input pin A
3 B1 CH1 input pin B
4 B2 CH2 input pin B
5 C1 CH1 input pin C
6 C2 CH2 input pin C
7 D1 CH1 input pin D
8 D2 CH2 input pin D
9 E1 CH1 input pin E
10 E2 CH2 input pin E
11 MIC Microphone input pin
12 FIL Filter pin
13 GND Ground pin
14 DATA Serial data latch receiving pin
15 CLK Serial clock receiving pin
16 Vcc Power supply pin
1-18
18
17
29 28 27 26
Middle2
Treble1 Treble2
f0=1kHz
f0=10kHz f0=10kHz
Vcc/2
Vcc/2
Vcc/2
25k 25k 25k 25k
25k 25k 25k 25k
4 5 6 7
Function
25 24 23 22
Middle1
Bass1
f0=1kHz
f0=90Hz
0dB~
-59dB
25k 25k 25k
25k 25k 25k
100k
8 9 10 11
Symbol
17 OUT2 CH2 output pin
18 BASS21 CH2 bass filter setting pin
19 BASS22 CH2 bass filter setting pin
20 OUT1 CH1 output pin
21 BASS11 CH1 bass filter setting pin
22 BASS12 CH1 bass filter setting pin
23 MID11 CH1 middle filter setting pin
24 MID12 CH1 middle filter setting pin
25 MID21 CH2 middle filter setting pin
26 MID22 CH2 middle filter setting pin
27 TRE2 CH2 treble filter setting pin
28 TRE1 CH1 treble filter setting pin
29 VOL1 CH1 input volume input pin
30 VOL2 CH2 input volume input pin
31 GOUT2 CH2 input gain output pin
32 GOUT1 CH1 input gain output pin
21 20 19 18
Bass2
f0=90Hz
0dB~
-59dB
Vcc/2 Vcc/2
Vcc/2
Logic
12 13 14 15
Function
17
16