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DP-7020
CIRCUIT DESCRIPTION
5—2. Explanation of terminals
Pin No.
|Pin Name|
1/0
Function
1~4
Pd~Pa
oO
FL segment control pins (also for key signal).
5
SENSE
1
Signal processing, pin to detect the SENSE signal from servo IC.
l
6
WFCK
|
Q data read-out clock pulse input pin.
7
SUBQ
|
Q data input pin,
8
SLTSW
{
Pickup stops (STOP : 'H').
9
RCI
|
Remoto control input pin.
10
SCOR
|
Sub-code frame sync detection signal input pin.
11
FOK
|
RF amplifier FOK signal input pin (At focus OK : "H').
12
GFS
i
Frame sync signal input pin (in frame sync : 'H').
13
REMUTE | O | Relay mutes (ON : 'L').
14
EMPH | O | De-emphasis control pin (ON : "L').
15
DIRC
oO 4
Servo IC DIRC pin .
16
VLDWN {| ©
| Volume control level goes down.
17
BUSY
| 1/0 ai BUSY signal of serial data. (System contro!)
18
SDATA | I/O | Data signal of serial data. (System control)
, OPNSW
Tray open switch (When open : "L').
20
CLSSW
| Tray close switch (When close : "L').
21~24 | KD0~-KO3
a
Key matrix key return input pins.
25
DATA
ie)
Signal processing, servo IC control output pin (Control data signal).
XLT
fe)
Signal processing, servo IC control output pin (Control data latch signal).
27, | CLK
oO
Signal processing, servo IC control output pin (Control data transmission clock signal).
28
VLUP
O | Volume control level goes up.
29
=
-
Unused.
—_
|_30
|X)
}
System clock pulse input pin.
| 31
:
-
~
Unused.
|
__32
Vss
~_|
GND.
33
XTl
~ | GND.
34
rae
cett al Unused. _
a
|
36
at VLLED | O ac LED for positioning output level (Blink : LEVEL varia).
36
PLYLD
ie)
PLAY LED lights.
37__|
PASLD |_O | PAUSE LED lights.
38
FLSG
O | Key scan signal when FL OFF (FL OFF : "HW.
39
| RESET | |
Reset input pin (Active L').
40-48
|Gi~G12|
O
FL digit control pins.
49
N.C
~__|
Unused.
=e
:
=
50
LCD
O | Signal for laser ON/OFF (Active °L').
=
51
MUTG
0
Muting signal for signal processor.
52
OPNM
10)
Tray OPEN/CLOSE
signat (Active 'H').
53
CLSM
54,55
SI,Sk
[e)
FL segment
ontrol pins (also for key scan signal}.
56
VLOAD
|
FL driver negative power supply (~30V).
57
|
VREF
|
FL pre-driver negative power supply {-5V).
58-63
| Pj~Pe
fe)
FL segment control pins {also for key-scan signal).
64
Voo
-
Power supply (+5V}.
DP-7020
CIRCUIT DESCRIPTION
6. RF AMP CXA1081S (X32-1500-11 : 1C104)
General
The CXA1081S 1s an IC developed for use in Compact Disc
Players.
11 incorporates
a 3-spot
optical
pickup
RF
output
amplifier, a focusing error amplifier, a tracking error amplifier,
and other signal processing circuitry, such as focus OK, mir-
ror, defect, and EFM comparator
circuits, as well as a laser
diode APC (Automatic Power Control) circuit
Features
°
Operates on a signal
+5 V power supply, as well as on a
+5 V dual-voltlage power supply
*
Low power
consumption
(100 mW
with
+5 V, 50 mW
with
+5 V)
©
An APC circurt which accepts either a P-sub or N-sub laser
diode
© A minimum of external parts required
¢
A dise defect detector circuit for improved
playability
6-1. Block diagram
@)
AUTO
ASYMMETRY
Structure
Bipolar silicon monolithic
!C
Functions
©
RF amplifier
*
Focus OK detector circuit
*
Mirror detector circuit
©
Tracking error amplifier
©
Defect detector cucu
©
APC circuit
*
EFM comparator
*
Auto asymmetry
control amplifier
21)
oe rect
COMPARATOR
= DEFECT
FM COMPARATOR
>
ve
OO
IRROR
re
zz
ey
©
ol
ee
or
T
DEFECT
BOTTOM
HOLD
"WwW
TRACKING
ERROR
ame
a
IRF SUMMING]
AMP
RF I-V AMPS)
ro @)
ioe p02 (8)
ioe
Lo
PO
CENTER
VOLTAGE
QUFFER
OQ RF I-v
AMP
(2)
OF
i-v
AMP
v
e
w
°
>
ws
23
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