CDX-A251C - Sony Car Audio Service Manual (repair manual). Page 2

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If the optical pick-up block is defective, please replace the whole
optical pick-up block.
Never turn the semi-fixed resistor located at the side of optical
pick-up block.

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, ob-
serve from more than 30 cm away from the objective lens.

• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

This label is located on the bottom of the chassis.

This set can playback CD-R and CD-ROM discs. The following
test discs should be used to check the capability:

CD-R test disc TCD-R082LMT (Part No. J-2502-063-1)
CD-RW test disc TCD-W082L (Part No. J-2502-063-2)

optical pick-up

semi-fixed resistor

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

This compact disc player is classified as a CLASS 1 LASER
product. The CLASS 1 LASER PRODUCT label is located on the
exterior.

AEP, UK, E, MX Model:

Outputs:

Speaker outputs (sure seal connectors)

Speaker impedance:

4 – 8 ohms

Maximum power output: US, CND, E, MX model:

52 W 

×

 4 (at 4 ohms)

AEP, UK model:
50 W 

×

 4 (at 4 ohms)

Outputs:

Audio outputs terminal (sub/rear switchable)
Power antenna relay control terminal
Power amplifier control terminal

Inputs:

Telephone ATT control terminal (AEP, UK, E, MX)
BUS control input terminal
BUS audio input terminal
Remote control input terminal
Antenna input terminal
AUX input jack (stereo mini jack)

Tone controls:

Low: ±10 dB at 60 Hz (XPLOD)
Mid: ±10 dB at 1 kHz (XPLOD)
High: ±10 dB at 10 kHz (XPLOD)

Power requirements:

12 V DC car battery (negative ground)

Dimensions:

Approx. 178 

×

 50 

×

 178 mm

(7 

1/8

 

×

 2 

×

 7 

1/8

 in.) (w/h/d)

Mounting dimensions:

Approx. 182 

×

 53 

×

 162 mm

(7 

1/4

 

×

 2 

1/8

 

×

 6 

1/2

 in.) (w/h/d)

Mass:

Approx. 1.2 kg (2 lb. 11 oz.)

Supplied accessories:

Card remote commander: RM-X151
Parts for installation and connections (1 set)

US and foreign patents licensed from Dolby Laboratories.

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

This unit cannot be connected to a digital preamplifier or an equalizer
which is Sony BUS system compatible.

• Abbreviation

CND : Canadian model
MX : Mexican model

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