MEX-1HD - Sony Car Audio Service Manual (repair manual). Page 5

5

The laser diode in the optical pick-up block may suffer electro-
static 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 emis-
sion, observe from more than 30 cm away from the objective lens.

• Material: GaAlAs
• Wavelength: 780 nm
• Emission Duration: continuous
• Laser Output Power: less than 44.6 

µ

W*

* This output is the value measured at a distance of 200 mm

from the objective lens surface on the Optical Pick-up Block.

This set is available with two types, Initial Lot type and User Up-
grade type, depending on the software version used in the micro-
computer.
If the Flash Memory (IC1030 on MAIN board) or mounted MAIN
board was replaced, the work (*1) required after parts replace-
ment is different according to the type. Therefore, before parts
replacement, check the type of set, and then perform the work
(*1) necessary for that type. However, if the version check is im-
possible because of a trouble in the set, handle it as a User Up-
grade type.
*1: For the work required after parts replacement, refer to “Setup

After Parts Replacement” and “Version Up After Microcom-
puter Software Related Parts Replacement” (page 22) in the
following section.

Procedure for check the version:
1. Select the “Test Mode” from the test mode main menu by ro-

tating the right jog dial (PUSH LIST), and press the right jog
button (PUSH LIST) to enter the Test Mode.

2. Rotate the right jog dial (PUSH LIST) to select the “Version”,

and press the right jog button (PUSH LIST) to enter the Ver-
sion mode.

3. With the “Version” mode activated, press the right jog button

(PUSH LIST), and the versions of Main, Sub, CD Servo will
be displayed respectively. Check the version of “Main”.
Version by type:
Initial Lot type

: 1.00.05

User Upgrade type : 2.03.02

This set requires the work such as microcomputer software ver-
sion up, system ID setting and HDD formatting, if either of flash
memory, microcomputer (or mounted MAIN, SUB, or SERVO
board) and hard disk drive (HDD) was replaced.
Perform the work required by referring to the “Test mode”, if ei-
ther of the following parts was replaced.

Replacement

Version up

System ID setting

 parts

and HDD processing

Flash memory
(IC1030 on MAIN

a

a

board) *1

Microcomputer
(IC501 on SUB

a

–

board) *1

Flash memory
(IC9 on SERVO

a

–

board) *1

HDD

–

a

*2

*1: Including the case where the mounted board as a whole is re-

placed.

*2: Executing the HDD formatting causes the user’s recorded data

to be all erased, and therefore be careful not to execute this
operation by mistake if the HDD was not replaced.

Version up:

Refer to “Version Up After Microcomputer Software Related
Parts Replacement”.

System ID setting and HDD processing:

Refer to “Relating with ID”.