Description Of Major Ics - JVC MX-GT98V Service Manual

Description of major ICs

AN7345K (IC302) : PB/REC amp.
1. Block diagram
L1
L2
24
23
2
1
R2
R1
2. Pin Function
Pin
Symbol
I/O
No.
I
1 Playback amplifier input
R1
2 Playback amplifier input
R2
I
3 NF2 I Playback amplifier negative feedback
4 O
OUT2 Playback amplifier output
Equlaizer
EQ2 I
5
6 CTL2 I Pre Amplifier input swithing time
constant
RIN2 I
Recording amplifier input
7
8 RNF2 I Recording amplifier negative feedback
ROUT2 O Recording amplifier output
9
ALC low cut
LC I
10
11 I ALC low pass filter
LPF
GND I
12
NF1 OUT1
EQ1
CTL1 RIN1
22
21 20
19 18
Pre
Pre
Source
AMP
CTRL
EQ
Pre
CTRL
AMP
5
3 4
6
OUT2 EQ2 CTL2 RIN2
NF2
Function
MX-GT98V/MX-GT95V/MX-GT88V
EQ
RNF1 ROUT1 CTL
RF
17 16 15 14
ALC REPPLE
AMP
ALC ALC
AMP
7 8 10 11
9
RNF2 LC LPF
ROUT2
Pin
Symbol I/O
No.
13 I
Vcc Power supply
14 RF I Repple filter
I
EQCTL EQ control
15
16 O
ROUT1 Recording amplifier output
17
RNF1 Recording amplifier negative feedback
I
RIN1
18
I Recording amplifier input
Pre amplifier input swithing control
CTL1 I
19
20
EQ1 I Equlayzer
21
Playback amplifier output
OUT1 O
NF1
22 Playback amplifier negative feedback
I
Playback amplifier input
L2 I
23
Playback amplifier input
24 I
L1
MX-GT85V/MX-G78V/MX-G75V
VCC
13
REJ
12
GND
Function
1-35