Circuit Description - Kenwood DM-3090 Service Manual

IC1101 VHiiR3R55//-1:RF Signal Control (IR3R55)
Pin No. Terminal Name
1 RF1
2 RF2
3 RF3
4 RF4
5 REFI
6 REFO
7 RFADD
8 TCGI
9 AIN
10 BIN
11 EIN
12 FIN
13 BIAS
14 AVCC
15* VSTBY
16* XDISC
17* XSGAIN
18 AGND
19 DGND
20 DTEMP
21 LATCH
22 CLOCK
23 DATA
24 DVCC
25 FOUT
26 EOUT
27 BOUT
28 AOUT
29 TCGO
30 WBO
31 22KI
32 22KO
33 ADLPFO
34* NC
35 ADIPO
36 ADIPI
37 ADAGC
38 ADAGI
39 RF2-1
40 EFMO
41* WFMI
42 AVCC
43 AGND
44 EFMAGC
45 EFMAGI
46* ATTR
47 GOUT
48 POUT
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.

CIRCUIT DESCRIPTION

I/O
I RF signal input terminal 1 Input of RF signal output of pickup
RF signal input terminal 2 Input of RF signal output of pickup
I
I RF signal input terminal 3 Input of RF signal output of pickup
I
RF signal input terminal 4 Input of RF signal output of pickup
Reference voltage amp. input terminal
I
Reference voltage amp. output terminal
O
RF1 to 4 resistance addition output terminal
O
Track cross detection signal amp. input terminal for groove
I
Servo signal amp. (focus servo system) inversion input terminal
I
Servo signal amp. (focus servo system) inversion input terminal
I
Servo signal amp. (tracking servo system) inversion input terminal
I
Servo signal amp. (tracking servo system) inversion input terminal
I
Bias input terminal
I
Analog section power terminal
–
Logic signal output terminal (STBY signal inversion signal is output.)
O
Logic signal output terminal (DISC signal inversion signal is output.)
O
O Logic signal output terminal (SGAIN signal inversion signal is output.)
Analog section GND terminal
–
– Digital section GND terminal
Chip temperature detection terminal
–
Latch signal input terminal
I
Clock signal input terminal
I
Serial data input terminal
I
Digital section power terminal
–
Servo signal amp. (tracking servo system) output terminal
O
Servo signal amp. (tracking servo system) output terminal
O
Servo signal amp. (focus servo system) output terminal
O
O Servo signal amp. (focus servo system) output terminal
O Track cross detection signal amp. output terminal for groove
O Comparator output terminal for ADIP signal binary-coding
I
Comparator input terminal for ADIP signal binary-coding
O
ADIP signal HPF amp. output terminal
O
ADIP signal LPF amp. output terminal
NC
–
ADIP signal primp. output terminal
O
O ADIP signal AGC amp. output terminal
ADIP signal AGC smoothing capacitor connection terminal
–
ADIP signal AGC amp. input terminal
I
– RF1 and RF2 difference signal
O RF signal primp. output terminal
RF signal AGC amp. output terminal
O
– Analog section power terminal
Analog section GND terminal
–
– EFM signal AGC smoothing capacitor connection terminal
EFM signal AGC amp. output terminal
I
– Pins 47 and 48 output signal attenuation terminal
O Output of signal of RF1+RF2-RF3-RF4 for groove
Rf1 to 4 resistance addition output for pit
O
DM-3090
Function
9