Description Of Major Ics - JVC Mx-GT80 Service Manual

MX-GT80/MX-GT90

Description of major ICs

AN7345(IC302) PB/REC AMP
1. Block diagram
L1
24
1
R1
2. Pin Function
Pin
Symbol I/O
No.
I
1
R1
2
R2
I
3 I
NF2
4 O
OUT2
EQ2 I
5
6 CTL2 I
RIN2 I
7
8 RNF2 I
9 ROUT2 O
LC I
10
I
11
LPF
GND I
12
1-34
L2
NF1 OUT1
EQ1
22
23 21 20
Pre
AMP
EQ
Pre
CTRL
AMP
2
5
3 4
R2 OUT2 EQ2 CTL2
NF2
Function
Playback amplifier input
Playback amplifier input
Playback amplifier negative feedback
Playback amplifier output
Equalizer
Pre Amplifier input switching time
constant
Recording amplifier input
Recording amplifier negative feedback
Recording amplifier output
ALC low cut
ALC low pass filter
EQ
CTL1 RIN1 RNF1 ROUT1 CTL
19 18 16 15
17
Pre
ALC
Source
AMP
CTRL
ALC
AMP
7 8
6 9 10
RIN2 RNF2 LC
ROUT2
Pin
Symbol
No.
13
Vcc
14 RF
EQCTL
15
16
ROUT1
17 RNF1
18 RIN1
CTL1
19
20
EQ1
21
OUT1
NF1
22
L2
23
24
L1
VCC
RF
14
13
REPPLE
REJ
ALC
11
12
LPF GND
I/O
Function
I
Power supply
I Ripple filter
I EQ control
O
Recording amplifier output
Recording amplifier negative feedback
I
I Recording amplifier input
I Pre amplifier input switching control
I Equalizer
Playback amplifier output
O
I Playback amplifier negative feedback
Playback amplifier input
I
Playback amplifier input
I