JVC Micro Component System UX-M55, Service Manual

Page: 32 / 36

UX-M55
1-32
GND
L-IN1
L-IN2
L-IN3
L-IN4
L SW-OUT
L VR-IN
L-B1
L-B2
L-B3
L TONE-OUT
L-T1
Vref
CK
VDD
R-IN1
R-IN2
R-IN3
R-IN4
R SW-OUT
R VR-IN
R-B1
R-B2
R-B3
R TONE-OUT
R-T1
STB
DATA 28
27
26
25
24
23
22
21
20
19
18
17
16
15 1
2
3
4
5
6
7
8
9
10
11
12
13
14
1.Terminal Layout
2.Block Diagram
TC9422F (IC301) : System electronic volume
28 1
16 13 14 15
5
3
4
2
24
23
22
21
20
19
18
17
26
25
27
LATCH
DECODER
CIRCUIT
32BIT SR
GND VDD
L-IN1
L-IN2
L-IN3
L-IN4
Vref CK DATA STB
R-T1
R TONE-OUT
R-B3
R-B2
R-B1
R VR-IN
R SW-OUT
R-IN4
R-IN3
R-IN2
R-IN1
INPUT SELECTOR
100k
MAIN VR
50k /64STEP
50k
BASS VR
50k /16STEP
TREBLE VR
50k /16STEP
750
500
13k
GAIN CONTROL
0,6,12,18dB
CAPACITOR FOR
OSCILLATION
50k
1k
13k
6
L SW-OUT
7
L VR-IN
8
L-B1
9
L-B2
10
L-B3
11
L TONE-OUT
12
L-T1
50k
BASS VR
50k /16STEP
TREBLE VR
50k /16STEP
750
500
CAPACITOR FOR
OSCILLATION
13k
13k
1k
50k
INPUT SELECTOR
100k
GAIN CONTROL
0,6,12,18dB
MAIN VR
50k /64STEP