Samsung MAX-555 - Page 39

4) TRACKING SLED SERVO SYSTEM(KA9220) : WICO1
The diagram of Tracking Sled Servo System is shown in the following. The capacitor between pin15 and 16 has a
time constant, and lowers the high frequency when TG2 is off. The maximum frequency of tracking phase compen-
sation is inversely proportional to the resistance connected to pin7(about 1.2KHz at 470K). The tracking jump in the
direction of FWD and REV is decided when TM3 and TM4 are ON, and the peak voltage induced from tracking coil is
decided by the both TM3 and TM4 current values, and feed back resistance of pin47.
Track jump max. Voltage= TM3(TM4) current x feedback resistance.
ISET VREG
56K SLED
DRIVER
FWD or REV sled kick is carried out when TM5 of TM6 is ON , and the peak voltage added to sled motor is decided by
TM5 or TM current and the feedback resistance of pin no. 41.
Sled jump max. voltage = TM5(TM6) current x feedback resistance.
Each SW current is decided by the resistance connected to pin no.22 and 23.
When the resistance is about 150kQ.
TM3 or TM4 = 11pA;
TM5 or TM6 = 22pA.
This
current
is
value
is
almost
inversely
proportional
to
the
resistor,
variable
within
a
range
of
about
5
to
40y/A
for
TMS.
STOP
is
the
ON/OFF
detection
signal
for
the
limit
SW
or
the
sled
motor’s
innermost
circumference.
5) ROULETTE CONTROL SENSOR
This sensor is composed of infrared LED (ilNuminatorJand PHOTO
IR(receptor),and PHOTO TR is ON or OFF when infrared rays are trans-
SER
mitted
or
blocked
by
the
irregularity
of
the
wing
in
the
bottom
of
ee
Bs
Eley
ROULETTE.
BY
ON/OFF
of
PHOTO
TR,
the
Pulse
signal
which
is
‘ ROULETTE control signal is applied to p-com.
eae ie eae ay
ted amotio dea
Leate es
Spe wee
#8 Bt
* -
MAX-557
-
10
-