CDX-L400X (serv.man2) - Sony Car Audio Service Manual (repair manual)

1

AEP Model

UK Model

Subject : Change of CD Mechanism

(ECN-CSB03573)

CD mechanism changed into MG-393XA-121//Q and MG-393XC-121//Q from
MG-393X-121//Q in the middle of the production.
When performing service and inspection, check the suffix of the part number of
the servo board.

SERVO BOARD Part No.
MG-393X-121//Q : 1-680-276-2
MG-393XA-121//Q, MG-393XC-121//Q : 1-683-660-1

KSS-720A

KSS-271A

MG-393XA-121//Q

MG-393XC-121//Q

- SERVO BOARD (COMPONENT SIDE) -

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1. Schematic Diagram –CD Mechanism Section– ...................... 3
2. Printed Wiring Boards –CD Mechanism Section– .................. 4
3. Exploded Views ....................................................................... 7
3-1. CD Mechanism Section (1) ................................................. 7
3-2. CD Mechanism Section (2) ................................................. 8
3-3. CD Mechanism Section (3) ................................................. 9
4. Electrical Parts List ................................................................ 10

for schematic diagram:
• All capacitors are in µF unless otherwise noted.  pF: µµF

50 WV or less are not indicated except for electrolytics
and tantalums.

• All resistors are in 

Ω

 and 

1

/

4

 

W or less unless otherwise

specified.

•

%

: indicates tolerance.

•

f

: internal component.

•

C

: panel designation.

•

A

: B+ Line.

• Power voltage is dc 14.4V and fed with regulated dc power

supply from ACC and BATT cords.

• Voltages are taken with a VOM (Input impedance 10 M

Ω

).

Voltage variations may be noted due to normal produc-
tion tolerances.

• Waveforms are taken with a oscilloscope.

Voltage variations may be noted due to normal produc-
tion tolerances.

• Circled numbers refer to waveforms.

• Signal path.

J

: CD

• X

: parts extracted from the component side.

• Y

: parts extracted from the conductor side.

•

a

: Through hole.

•

: Pattern from the side which enables seeing.

(The other layer’s patterns are not indicated.)

Note: The components identified by mark 

0

 or dotted line

with mark 

0

 are critical for safety.

Replace only with part number specified.

Caution:
Pattern face side: Parts on the pattern face side seen from the
(Side B)

pattern face are indicated.

Parts face side: Parts on the parts face side seen from the
(Side A)

parts face are indicated.

•

((

)) : Refer to page of Service manual.

(MODE: CD PLAY)

3

3

((Page 22))

• Voltage is dc with respect to

ground under no-signal conditions.
no mark : CD PLAY

4

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