Block Diagram - JVC UX-M3R Service Manual

UX-M3R
BA4558 (IC402) : Dual operational amplifier
1. Terminal layout & Block diagram
1ch
1 3 4
2
OUT1 -IN1 +IN1 V
EE
BU1923F (IC602) : RDS decoder
1. Terminal layout
1
QUAL
16
2
RDATA 15
3
VREF
14
4
MUX 13
5
VDD1
12
6
VSS1 11
7
VSS3
10
8
CMP 9
2. Pin function
PIN
Symbol I/O
No.
1 QUAL O Demodulator quality, good data: Hi, bad data: Low
2 RDATA O Demodulator data
3 VREF - Reference voltage, 1/2 V
4 MUX I Composite signal input
5 VDD1 - Analog power supply
6 VSS1 - Analog power supply
7 VSS3 - Analog ground
8 CMP I
Comparator input, C-junction
9 T1 I Test input, open or connected to ground
10 T2 I Test input, open or connected to ground
11 VSS2 - Digital power supply
12 VDD2 - Digital power supply
13 XI I 4.332MHz crystal oscillator input
14 XO O 4.332MHz crystal oscillator output
15 NC - Not used
16 RCLK O 1187.5Hz demodulator clock
LA4282 (IC401) : Power amplifier
1. Terminal layout & Block diagram
300
Ripple
filter
300
1 2 3 4 5
NF1 IN1 RIPPLE PRE IN2
FILTER GND
1-24
2ch
5 6 7 8
+IN2 -IN2 OUT2 Vcc

2. Block diagram

RCLK
NC
MUX
XO
XI
VDD2
VREF
VSS2
T1
T2
VDD1
VSS1
VDD2
12
VSS2
11
Function
DD1
30k
CH1
Thermal
over voltage
protector
CH2
30k
Vcc
Mute
circuit
6 7 8 9 10 11 12
NF2 OUT2 MUTE POWER Vcc OUT1 POWER
GND2 GND1
2. Pin function
PIN
Symbol I/O
No.
1 OUT1 O
2 -IN1 I
3 +IN1 I
4 V -
EE
5 +IN2 I
6 -IN2 I
7 OUT2 O
8 Vcc -
100k
4
120k
100k -
+
3
anti-aliasing
filter
5
Analog
Power supply
6
PLL
PLL
57kHz
1187.5Hz
Digital RDS/ARI
Power supply
Reference
clock
13 14
Xl XO
2. Pin function
PIN
Symbol I/O
No.
1 NF1 -
2 IN1
3 RIPPLE FILTER -
4 PRE GND -
5 IN2
6 NF2 -
7 OUT2 O
8 MUTE -
9 POWER GND2 -
10 Vcc -
11 OUT1 O
12 POWER GND1 -
Function
A output
A - input
A + input
V-
B + input
B - input
B output
V+
VSS3 CMP
7 8
8th Switched
capacitor filter
comparator
RCLK
16
QUAL
1
Bi-phase Differential
RDATA
2
decoder decoder
Measurement
circuit
10 9
T2
T1
Function
Right channel negative feed back
I Right channel signal input
Ripple filter
PRE GND
Left channel signal input
I
Left channel negative feed back
Left channel output
Mute control
Power GND
Power supply
Right channel output
Power GND