Description Of Major Ics - JVC XM-PX70WT Service Manual

Description of major ICs

JCV8002-W (IC601) : Head phone amp
1. Pin layout
2. Block diagram
3. Pin function
Pin
Symbol FUNCTION
no.
V
(+B) in power amplifier output steps
1 V
CC2 CC2
Power amplifier output
2 OUT
A
GND in power amplifier output steps
3 PWR GND
Power amplifier output
4 OUT
B
5 DET Smoothness of level detection of boost
6 AGC IN BST amplifier input signal level variable control by input lever to boost AGC input terminal
7 BST OUT Output terminal of BST amplifier2
8 BST NF Terminal NF of BST amplifier2
2
9 LPF Output BST amplifier1
2
10 BST NF NF of BST amplifier1
1
ADD IN
11 ADD amplifier input
12 V Standard potential circuit
ref
13 V IN Standard potential circuit
ref
GND
14 Power part input steps GND
15 BEEP IN Beep input terminal
16 BST SW Beep output terminal
17 MT SW Mute switch
18 PW SW Power On/OFF switch
19 MT TC Mute smoothing Power mute switch
20 V Main parts V
CC1
21 IN Power amplifier input
B
22 IN Power amplifier input
A
23 Beep output terminal
BEEP OUT
B
24 Beep output terminal
BEEP OUT A
24 ~ 19
1
6
7 ~ 12
PW
SW
18 17
MT
MT BST
SW
TC SW
PW MT
19
SW
SW
V
CC1
20
IN B
21
IN A
22
BEEP
OUT B
PW
23
A
BEEP
OUT A
24
PWR
V
CUT A
CC2
GND
1 2
AGC
CC
18
13
16 15 14
Vref
GND
BEEP
IN
IN
BST
BEEP
SW
BST1
BST2
PW
B
BST
AGC
OUT
DET
B
3 4 5
AGC
IN
XM-PX70WT/BU/PN
13
12
Vref
Vref
11
ADD
IN
10
BST
NF1
9
LPF
2
8
BST
NF
2
7
BST
OUT
6
1-11