JVC VS-DT9R Service Manual page 23

Pin No. Symbol
41 X1
42 VSS1
43 FLAG
44 BLKCK
45 /RFDET
46 EQx2
47 EQx4
48 P71/TIO1
49 FWD
50 REW
51 IREFx4
52 P75/BUZ
53 /RESET
54 STAT
55 /DMUTE
56 /P.ON
57 MLD
58 MDATA
59 MCLK
60 P43/AD3
61 P44/AD4
62 P45/AD5
63 /SW2
64 /SW3
LA4905 (IC301) : 2ch BTL power IC
1. Terminal layput
1 23
I/O
- Connect to external crystal oscillator
- Ground terminal
I Flag signal input
I Sub code block clock signal input
I RF signal amplitude detecting signal input
I Equalizer select signal input
I Equalizer select signal input
- Not use
O Loading (EJECT) output
O Loading (LOAD) output
O Switching signal for IREF current (4x mode : L)
- Not use
O Reset signal output (L: reset)
I Status signal input
O Muting output
O Power ON/OFF switching signal output
O Microcomputer command load signal output
O Microcomputer command data output
O Microcomputer command clock signal output
- Not use
- Not use
- Not use
I Mechanism switch (Loading switch)
I Mechanism switch (Chucking completion)
2. Block diagram
8 9 15 14 12 13 16
SW
drive
VH
11
D
C
H.L.S.
B
A
Switching regulator
block
VH 10
Standby Ripple
SW filter
21 20
Function
7 5 6
Amplifier
A B
output
stage
H.L.S. :
Higher
Level signal
CH 1
selector
Input BEEP
amplifier amplifier
2 3
VS-DT9R/VS-DT6R
18 19 17 22
C
D
Pop noise
CH 2
prevention
circuit
Input
amplifier
ON MUTE
muting circuit
4 1 23
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