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DP-MA5/MAQ9
CIRCUIT DESCRIPTION
4-3. Pin functions
Pin No. | Pin name
|1/O
Function
1
VC
Middle-point voltage input terminal.
When two power sources are used : GND, when single power source is used : (Vec+GND}/2.
2
|
FGD
When
lowering the high-band gain of the focus servo, insert a capacitor between this terminal and terminal No. 3. |
3
FS3
Change the high-band gain of the focus servo by turning FS3 on and off.
4
FLB
Outside terminal of time constant for raising the low-band of the focus servo.
5
FEO
O | Focus drive output.
6
FE-
Inverted input terminal of focus amplifier.
[7
SRCH
F,
Outside terminai of time constant for making focus search
waveform.
8
TGU
Outside terminal of time constant for changing high-band gain of tracking.
9
TG2
]
Outside terminal of time constant for changing high-band gain of tracking.
AVCC
t+
rs os
TAO
| O | Tracking drive output.
TA-
|
Inverted input terminal of tracking amplifier.
ne
SL+
|_Non-inverted input terminal
of thread amplifier.
SLO
O | Thread drive output.
OlaM!iWia|ajRJwl/w|=fo
4
SL-
Inverted input terminal of thread amplifier.
1
FSET
Terminal for setting the peak for phase compensation of focus tracking.
1
ISET
Ace
Current for determining the height of the focus search track jump thread kick is applied.
1
SSTOP
|
Terminal for ON/OFF detecting signal of limit switch for detecting the most inside line of disc.
1
AVEE
|
20
DIRC
Used to jump over one track. 47kQ pull-up resistor is inserted.
21
LOCK
When
"L", thread runaway-preventive
circuit operates. 47kQ pull-up resistor is inserted.
22
CLK
Clock input for transferring the serial data fromm CPU (having no pull-up resistors).
=a
23
XLT
Latch input from CPU (having no pull-up resistors).
24
DATA
|
Serial data input from CPU (having no pull-up resistors).
25
XRST
Reset when reset input terminal is at ''L" (having no pull-up reisitors).
26
SENS
| © | Outputs FZC, AS, TZC, SSTOP, etc. on receipt of command from CPU.
27
. pan
O | Signa! output for counting tracks.
—
ze
Tn
5 | Outpt terminal of MIRR comparator. (DC voltage : Load of 10kQ connected)
i | 30 =a DFCT
Output terminal of DEFECT comperator.
(DC voltage : Load
10kQ connected)
31
|
ASY
Input terminal of auto asymmetry control.
32
|
EFM
| O | Output terminal of EFM comparator.
(DC voltage : Load of 10kQ connected)
33
FOK
O , Output terminal of focus OK comparator.
(DC voltage : Load of 10kQ connected)
34
CCI
deals|
DEFECT bottom
hold output terminal.
35
CC2
O | Terminal in which DEFECT bottom
hold output is input after capacitive coupling.
36
DVCC
37
CB
ios Terminal to which DEFECT bottom
hold capacitor is connected.
38
CP
Terminal for connecting
MIRR hold comparator.
Non-inverted
input terminal of MIRR comparator.
39
RFI
Terminal in which output of RF summing amplifier is input after capacitive coupling.
40
RFO
O | Output terminal of RF summing amplifier. Check point of eye pattern.
41
| DVEE
|
42
TZC
Input terminal of tracking zero cross comparator.
43
TE
i Input terminal of tracking error.
44
TDFCT
Terminal for connecting the capacitor for time constant in case of defect.
45
|
ATSC
| |
Input terminal of window comparator for detecting ATSC.
46
gi
FZC
|
Terminal for inputting the focus zero cross comparator.
47
FE
Input terminal of focus error.
48
FDFCT
!_ | Terminal for connecting capacitor for time constant in case of defect.
16
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