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DP-7020
7-3. Explanation of terminats
Terminal No. | Terminat name
CIRCUIT DESCRIPTION
Functions
1
TG2
Tracking amplifier gain switching terminal. GND
level.
A®
Non
inverted
input of operational
amplifier 2.
TEO
Output
of operational amplifier 4
TEO
Inverted input of operational amplifier 4.
SENSE
Output of SSP internal status that corresponds tc ADDRESS
of CPU — SSP.
(Changes
in accordance with AODRESS
content
of internal serial register.) See Note
1
Cc. OUT
Signal output
for counting number
of tracks at the time of high speed access.
XRST
All internal
registers are cleared when
CPU
> SSP "L".
Connected with CPU RESET.
See Note 2.
DATA
Serial data transmission ot CPU — SSP. Input is made from LSB. DO~D7
XLT
Latch of serial data of CPU -» SSP. (The contents
of internal serial register are transmitted to each
address decoded
latch.) Transmission
at
"L''. Change
to ''H"' occurs
immediately
after execution
because
no edge trigger
is produced
CPU — SSP serial data transmission clock. Data is read at falling
"H" level before and after transmission
Mirror signal input from RF amptifier
Tracking error signal is input with C couple.
The time constant is determined by one singie track
jump, but it is usually around 2kHz.
Tracking error signal input.
Setting of current
tevel for determining
focus search
voltage,
tracking jump voltage and sled feed voltage
Power supply terminal. Normally —5V.
The capacitor for determining the time constant of charge/discharge waveform for focus search
is Connected,
Power
supply terminal.
Normally
—5V
Focus amplifier gain switching terminal. GND level
Such
information
that a mechanical
shock
was applied
to the player
is input. Simply, a trakcing
error is input through B.P.F,
Input cf focus error signal.
Output of operational ampiifier 1.
Inverted
input of operational amplifier
1.
Output
of operational
output
3.
Inverted input of operational amplifier 3.
Non inverted input of operational amplifier 3.
VUses at the time of one track jump.
Normatly
"H"'.
The direction
of the track
jump
pulse ts
reversed
with
"'L"". Setting is made
in the normal
tracking mode
by changing
to
"HH"
"L" for a fixed length of time with detection of activation, deactivation of TZC
Output of operational ampiitier 2.
{Inverted input of operational amplifier 2.
Tracking amplifier gain switching terminal.
GND
level
Note
1: SENSE
termina! output
GND terminal of IC
-
Gaara postal Ngeactibanah
ach ec
Explenstion
Note 2 : Digital unit timing chart
jupper4bits|
content
terminal output
Te
wna fouas pare
eto Ts SABE
pata
ee Ye Koz Vos
on Ye Y os X o
F
. | focus
7
tage
WOM or igher
{
1
9808 | contaor
Eee
Used ar te ume ot
|
FOCUS PULL opera
ban
tsu ~4 r—t
He when the ATSC
sy
th
Data is loaded at activation ;
infos level exceeds the
6F0:001
RACKING
aS
wand comparator level
CONROE
iVTH + + Vee
© 13%)
CLK
Bur this 5 not used 9
(Dis equipment
|
j
|
|
——
Judgement output oF
tose
tak
positive or negative ot
7
tracking cere cross
+—-+
kK tw
tracking error
1/tck
i
oO
10
TR ACEING
T20
Earn
'
i]
i
a
at
sin.
rack
yumy
eae
DIAG 1s veauced to
XLT~
}
\
LU os apteeuion of
!
FF WO
JUMP
26
|
ton ot
Execution of instruction
1
tf
L
i
tv UMP
rh
7-4. System control
COMMAND
CIRCUIT DESCRIPTION
ADDRESS
DATA
DP-7020
D7
[06 | D5 | 04
D3
02
Dt
DO
+ SENSE
FOCUS CONTROL
o};0
/0
FS4
FS3
FS2
FS1
FOCUS
GAIN
SEARCH
| SEARCH
ON
DOWN
ON
162,
GAIN
ANTI
BREAK
SHOCK
ON
TRACKING*
MODE
SLEOD*
MODE
GAIN SET* TG1, TG2 may be set independentty.
In the case of ANTI SHOCK = 1 (00011XXX}, both TG1, TG2
are inverted when ANT? SCHOCK
=H".
SLED MODE *
TRACKING
MODE *
OFF
OFF
SERVO ON
FWO JUMP
REV JUMP
SERVO ON
FWD MOVE
REV MOVE
27
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