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SECTION 2
IC FUNCTION
DESCRIPTION
IC101
(CXA1372Q)
PIN DESIGNATION
40
Pin Name
Pin Description
<
or the center
voltage (2.5 V)
€0
a
oO
<
= o t=]
[oa
s
°
-o-~
H
—
a e
2, 9
°o
s
oO
te
an
c
g 2
Lod
oO
a
iy
tal
oO
low
j=) c
n
©
en
a single
power
supply
is in use.
Time constants for gain switching in normal mode/down
mode and for focus gain are
"zy
GD
my %
F
C
B
he capacitor for low frequency boost in the focus servo loop is connected.
'ocus drive output
verted input to focus amplifier
ime constants
to generate
the focus search waveform
are connected.
ime constants for gain switching in normal mode/up
mode and for tracking gain are
/5|s]
ale
5
8
@ far
img
s
=
&
~
ze 3
rs) 5
Qa
tes]
4]
vv,
P
SRCH
843
5
2
B
g
=
8
3
a
Gq
i] 5
z
al
NS) 2 5
AVCC
Analog power supply (5 V when + dual power
supplies are in use, 5 V when a single
=
o 5 "a
i=
Ko]
o
<
a
5
4
&
—
wy
A
4
racking
drive
output
nverted
input
to tracking
amplifier
Non-inverted
input to sled amplifier
Sled drive output
on-inverted
input to sled amplifier
The 610~kQ
phase compensator
resistor is connected
to this pin.
The current
setting resistor is connected
to this pin.
The limit switch is connected
to this pin.
a °
n n 34
ic
Alaigieleie|3
a digia
<
QIAApHOl+]
10
NaqQii
~]
ISET
a bod Od 0a 0d leat Lawn' _
AVEE
Analog power supply (—5V when + dual power supplies are in use, or GND when a single
power supply is in use.)
Direct control pin.
| LOCK |
|__ SENS |
SENG | CUPDIOE
eee
ee
dk
feral
Digital ground (GND).
(GND when + dual power supplies are in use. GND when a single
power supply is in use.)
| MIRR_ |
EFM
| FOK
CC2
8
fect-bottom-hold
output.
igital power supply (+5 V when + dual power supplies in use.
+5 V when a single
wer supply is in use.)
The defect-bottom-hold
capacitor is connected
to this pin.
RF
s i
DVCC
4
Q &
8
g Q
Q
P
a
FO
E
signal input (input by DC coupling).
Digital power supply (—5 V when + dual power
supplis are in use.
GND
when a single
power supply is in use.)
4 8
E
TDFCT
ATSC
ZC
E
FDFCT
es]
Focus
zero-cross
comparator
input
I
The defect prevention
hold capacitor
is connected
to this pin.
C4 ~
hry
SECTION
3
DISSASSEMBLY
OF BASE UNIT
Note:
Follow
the
disassembly
procedure
in the
nomerical
order given.
@ Turn
the cam
to the direction
of arrow
(Counter
clock wise) by minus screw driver.
@ Take off the disc table.
© Remove the bracket yoke.
@ Remove the MD (BU-5BD1) to the direction of arrow.
BU-5BD1
Te
BRACKET, YOKE
i
8B
4)
ELEC
1. Perfo
2. Use
wise
3. Use t
RF LE
This
Optical
Proced
1, Con
TP (
2. Turi
3. Put
4. Conf
Opti
clear
RF
E-F B
Thi
Optical
Proced
1. Con
and
2. Gro
3. Tur
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