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E Model

Subject : Production country change of CDX-GT170S and

CDX-GT270S.
Saudi Arabia model addition of CDX-GT270.

The CDX-GT170S (E), CDX-GT270S (E) and CDX-GT270S (Indian) model has been changed in the production country to Thailand from
Chinese.
This service manual, SUPPLEMENT-1 only contains the change.
When servicing and inspecting, check the Model Number Label to see if the model is made in Thailand or Chinese.

SONY

R

MODEL

No.

CDX-GT270S

3-218-591-0    : CDX-GT270S E Model
3-218-743-0    : CDX-GT170S E Model
3-218-752-0    : CDX-GT270 Saudi Arabia Model

MADE IN THAILAND

CDX-GT270

CDX-GT170S

–Model Number Label–

3-291-947-0    : CDX-GT270S Indian Model (Maruti Suzuki)

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1-1.   Printed Wiring Board –Main Section– ................................ 5
1-2.   Schematic Diagram –Main Section (1/4)– .......................... 6
1-3.   Schematic Diagram –Main Section (2/4)– .......................... 7
1-4.   Schematic Diagram –Main Section (3/4)– .......................... 8
1-5.   Schematic Diagram –Main Section (4/4)– .......................... 9
1-6.   Printed Wiring Board –Key Section– ................................ 10
1-7.   Schematic Diagram –Key Section– ................................... 11

2-1.   Main Section ..................................................................... 13
2-2.   Front Panel Section ........................................................... 14
2-3.   CD Mechanism Section (MG-101TC-188//Q) .................. 15

........................................ 16

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Note:
• All capacitors are in µF unless otherwise noted.  (p: pF)

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.

•

f

: internal component.

•

C

: panel designation.

• 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 layers' patterns are not indicated.)

•

A

: B+ Line.

•

B

: B– Line.

•

H

: adjustment for repair.

• Voltages and waveforms are dc with respect to ground

under no-signal (detuned) conditions.

   no mark : FM

(

) : MW/SW

<

> : CD PLAY

∗

: Impossible to measure

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

Ω

).

Voltage variations may be noted due to normal production
tolerances.

• Waveforms are taken with a oscilloscope.

Voltage variations may be noted due to normal production
tolerances.

• Circled numbers refer to waveforms.

• Signal path.

J

: CD PLAY

F

: FM

f

: MW/SW

L

: AUX

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.

Q

C

These are omitted

E

B

E

These are omitted

C

B

C

These are omitted

B

E

Note: The components identified by mark 

0

 or dotted line

with mark 

0

 are critical for safety.

Replace only with part number specified.

Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with

the lead free mark due to their particular size.)

Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40°C higher than

ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350°C.
Caution: The printed pattern (copper foil) may peel away if the

heated tip is applied for too long, so be careful!

• Strong viscosity

Unleaded solder is more viscous (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.

• Usable with ordinary solder

It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.

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