JVC UX-M3R Service Manual page 27

TC9422F (IC301) : System electronic volume
1.Terminal Layout
1 28 VDD
GND
2 27 R-IN1
L-IN1
3 26 R-IN2
L-IN2
4 25 R-IN3
L-IN3
5 24 R-IN4
L-IN4
6 23 R SW-OUT
L SW-OUT
7 22 R VR-IN
L VR-IN
8 21 R-B1
L-B1
9 20 R-B2
L-B2
10 19 R-B3
L-B3
11 18 R TONE-OUT
L TONE-OUT
12 17 R-T1
L-T1
13 16 STB
Vref
14 15 DATA
CK
3.Pin Function
Pin No.
Symbol
1 GND
2 L-IN1
3 L-IN2
4 L-IN3
5 L-IN4
L SW-OUT
6
7 L VR-IN
8 L-B1
9 L-B2
10 L-B3
11 L TONE-OUT
12 L-T1
Vref
13
14 CK
15 DATA
16 STB
17 R-T1
18 R TONE-OUT
19 R-B3
20 R-B2
21 R-B1
22 R VR-IN
23 R SW-OUT
24 R-IN4
25 R-IN3
26 R-IN2
27 R-IN1
VDD
28
2.Block Diagram
INPUT SELECTOR
100k
2
L-IN1
L-IN2 3
L-IN3 4
GAIN CONTROL
L-IN4 5
6
L SW-OUT
MAIN VR
50k /64STEP
7
L VR-IN
L-B1 8
50k
L-B2 9
10
L-B3
CAPACITOR FOR
OSCILLATION
13k
L TONE-OUT 11
500
L-T1 12
750
I/O
- Ground pin
I Audio signal input pin (L-ch)
I Audio signal input pin (L-ch)
I Audio signal input pin (L-ch)
I Audio signal input pin (L-ch)
Audio signal output pin (L-ch)
O
I Main volume input pin (L-ch)
I Tone control tap pin 1 for bus
I Tone control tap pin 2 for bus
I Tone control tap pin 3 for bus
O Tone control output pin (L-ch)
I Tone control tap pin for treble (L-ch)
I Reference voltage input pin
I Clock input pin
I Data input pin
I Strobe input pin
I Tone control tap pin for treble (R-ch)
O Tone control output pin (R-ch)
I Tone control tap pin 3 for bus
I Tone control tap pin 2 for bus
I Tone control tap pin 1 for bus
I Main volume input pin (R-ch)
O Audio signal output pin (R-ch)
I Audio signal input pin (R-ch)
I Audio signal input pin (R-ch)
I Audio signal input pin (R-ch)
I Audio signal input pin (R-ch)
- Power supply voltage pin
GND VDD
1 28
GAIN CONTROL
0,6,12,18dB 0,6,12,18dB
LATCH
DECODER
CIRCUIT
BASS VR BASS VR
50k /16STEP 50k /16STEP
TREBLE VR TREBLE VR
50k /16STEP 50k /16STEP
32BIT SR
50k 50k
13 14 15 16
Vref CK DATA STB
Function
UX-M3R
INPUT SELECTOR
100k
27 R-IN1
26 R-IN2
25 R-IN3
24 R-IN4
R SW-OUT
23
MAIN VR
50k /64STEP
22 R VR-IN
21 R-B1
50k
20 R-B2
R-B3
19
CAPACITOR FOR
OSCILLATION
13k
R Tone-OUT
18
500
17 R-T1
750
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