JVC RC-EX30B Service Manual page 16

RC-EX30
TC9422F(IC401):System Electronic Volume
1.Terminal layout 1.Terminal layout
1 28
2 27
3 26
4 25
5 24
6 23
7 22
8 21
9 20
10 19
11 18
12 17
13 16
14 15
3.Pin function
Pin No. Symbol
1 GND
2 L-IN1
3 L-IN2
4 L-IN3
5 L-IN4
6 L-SW-OUT
7 L-VR-IN
8 L-B1
9 L-B2
10 L-B3
11 L-Tone-OUT
12 L-T1
13 Vref
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
28 V
DD
16
L-IN1
L-IN2
L-IN3
L-IN4
L-SW-OUT
L-VR-IN
L-B1
L-B2
L-B3
10
11
L-Tone-OUT
12
L-T1
I/O
- Ground pin
I Audio signal input pins
I Audio signal input pins
I Audio signal input pins
I Audio signal input pins
I Audio signal input pins
I Main volume input pins
- Tone control tap pin 1 for bus
- Tone control tap Pin 2 for bus
- Tone control tap pin 3 for bus
O Tone control output pins
- Tone control tap pin for treble
I Reference voltage input pin
I Clock input pin
I Data input pin
I Strobe input pin
- Tone control tap pin for treble
O Tone control output pins
- Tone control tap pin 3 for bus
- Tone control tap Pin 2 for bus
- Tone control tap pin 1 for bus
I Main volume input pins
I Audio signal input pins
I Audio signal input pins
I Audio signal input pins
I Audio signal input pins
I Audio signal input pins
- Power supply voltage pin
2.Block diagram 2.Block diagram
GND
1
INPUT SELECTOR
SELECTOR INPUT
100kW
2
3
+ -
4
GAIN CONTROL
GAIN CONTROL
0,6,12,18dB
5
6
MAIN VR MAIN VR
50kW/64STEP
7
+ -
8
50kW
9 + -
- +
CAPACITOR FOR
CAPACITOR FOR
OSCILLATION
VR BASS
BASS VR
50kW/16STEP
13kW
500W
-
TREBLE VR
TREBLE VR
+
50kW/16STEP
750W
50kW 50kW
13 14
Vref CK
Function
VDD
28
INPUT SELECTOR
SELECTOR INPUT
100kW
- +
GAIN CONTROL
GAIN CONTROL
0,6,12,18dB
LATCH
MAIN VR MAIN VR
+
50kW/64STEP
DECODER
CIRCUIT
- +
50kW
+ -
+ -
CAPACITOR FOR
CAPACITOR FOR
OSCILLATION
BASS VR
BASS VR
50kW/
16STEP
13kW
VR TREBLE
TREBLE VR
50kW/
16STEP
32BIT SR
32BIT SR
32BIT SR
15 16
DATA STB
27 R-IN1
26 R-IN2
25 R-IN3
24 R-IN4
23 R-SW-OUT
22 R-VR-IN
21 R-B1
20 R-B2
19
R-B3
18 R-Tone-OUT
500W
17 R-T1
750W