Sony CDP-490 - SECTION 3 DISSASSEMBLY OF BASE UNIT

SECTION 2
IC FUNCTION DESCRIPTION
IC101 (CXA1372Q) PIN DESIGNATION
40
Pin Name Pin Description
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or the center voltage (2.5 V)
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H
—
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9
°o s oO
te
an c
g 2
Lod
oO a iy
tal
oO
low j=) c
n
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en a single power supply is in use.
Time constants for gain switching in normal mode/down mode and for focus gain are
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GD
my
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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
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ze
3
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vv,
P
SRCH
843
5
2 B g = 8 3 a
Gq
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5
z al
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2
5
AVCC Analog power supply (5 V when + dual power supplies are in use, 5 V when a single
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5
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i=
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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.
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Alaigieleie|3 a digia < QIAApHOl+] 10 NaqQii
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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 si
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.
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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