CDX-T70MXDC - Sony Car Audio Service Manual (repair manual)

AEP Model

Model Name Using Similar Mechanism

CDX-T70MX

CD Drive Mechanism Type

MG-276A-159

Optical Pick-up Name

KSS-721A

2005F05-1
© 2005.06

System

Compact disc digital audio system

Frequency response

5 – 20,000 Hz

Wow and flutter

Below the measurable limit

Signal-to-noise ratio

102 dB

Outputs

BUS control output (8 pins)
Analog audio output (RCA pin)

Current drain

800 mA (during CD playback)
800 mA (during loading or ejecting a disc)

Operating temperature –10

°C to +55°C

Dimensions

Approx. 234.4 

× 60 × 159.5 mm (w/h/d) not incl.

projecting parts and controls

Mass

Approx. 1.5 kg

Power requirement

12 V DC car battery (negative earth)

Supplied accessory

Disc magazine (1)

MPEG Layer-3 audio coding technology and patents licensed from Fraunhofer

IIS and Thomson.
Design and specifications subject to change without notice.

SONY MODEL NAME : CDX-T70MXDC
DAIMLERCHRYSLER MODEL NAME : MP3 CDC 6
(Part No. B6 656 05 80)

2

The laser diode in the optical pick-up block may suffer electrostatic
breakdown because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic breakdown and also use
the procedure in the printed matter which is included in the repair
parts.
The flexible board is easily damaged and should be handled with
care.

The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation
exposure.

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be

damaged by heat.

• Keep the temperature of the soldering iron around 270 ˚C

during repairing.

• Do not touch the soldering iron on the same conductor of the

circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering

or unsoldering.

 0

0

When replacing the main chassis assy of mechanism deck which
have the “CAUTION LABEL” attached, please be sure to put a
new CAUTION LABEL (3-223-913-11) to the main chassis assy.

3

    Remove the CASE (LOWER. S) beforehand

1)

Press the lever (MZ LOCK) in the direction of arrow A.

2)

Removal the magazine assy.

:Take out the magazine only when the tray is completely within the

magazine. If the disk or tray is sticking out, turn on the power and
eject the magazine.

This set can playback a CD-R, CD-RW for audio use. When test
this set, use the following test disc.
Test disc for CD-R: TCD-R082LMT (Part No.: J-2501-063-1)
Test disc for CD-RW: TCD-W082L (Part No.: J-2501-063-2)

Installation .......................................................................

3

2-1.

Disassembly Flow ...........................................................

5

2-2.

Front Panel (S) Assy, Case (Upper S) .............................

6

2-3.

Mechanism Deck (MG-276A-159) .................................

6

2-4.

JACK Board .....................................................................

7

2-5.

Belt (TS) ..........................................................................

7

2-6.

MAIN Board ....................................................................

8

2-7.

Escutcheon (S), Slide Variable Resistor
(Elevator Height Sensor) (RV301) ..................................

8

2-8.

MD Motor Assy (Elevator) (M104) .................................

9

2-9.

LE Motor Assy (Chucking) (M103) ................................

9

2-10. RF Board ......................................................................... 10
2-11. Sled Motor Complete Assy (M101) ................................ 10
2-12. Optical Pick-up (KSS-721A) ........................................... 11
2-13. Chassis (EV) Assy ........................................................... 11
2-14. Lever (CHK.L) Assy, Lever (CHK.R) Assy .................... 12
2-15. Chassis (OP) Block Service Assy .................................... 12

.......................... 13

........................................... 14

5-1.

Block Diagram – SERVO Section – ................................ 16

5-2.

Block Diagram – MAIN Section (1/2) – ......................... 17

5-3.

Block Diagram – MAIN Section (2/2) – ......................... 18

5-4.

Printed Wiring Board – RF Board – ................................ 20

5-5.

Schematic Diagram – RF Board – ................................... 21

5-6.

Printed Wiring Board
– MAIN Board (Component Side) – ............................... 22

5-7.

Printed Wiring Board
– MAIN Board (Conductor Side) – ................................. 23

5-8.

Schematic Diagram – MAIN Board (1/3) – .................... 24

5-9.

Schematic Diagram – MAIN Board (2/3) – .................... 25

5-10. Schematic Diagram – MAIN Board (3/3) – .................... 26
5-11. Printed Wiring Board – JACK Board – ........................... 27
5-12. Schematic Diagram – JACK Board – .............................. 27

6-1.

Case Section .................................................................... 35

6-2.

Mechanism Deck Section-1 (MG-276A-159) ................. 36

6-3.

Mechanism Deck Section-2 (MG-276A-159) ................. 37

................................ 38

Lever (MZ LOCK) 

Magazine assy

A

4

This section is extracted from
instruction manual.

c

c

If the disc magazine does not lock properly
Take out the magazine, and after pressing the Z (EJECT) button,

reinsert it.

Press Z (EJECT) button down

Use the unit with the door closed completely
Otherwise, foreign matter may enter the unit and

contaminate the lenses inside the changer.