HCD-MJ1, HCD-MJ1A - Sony Audio Service Manual (repair manual). Page 4

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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
more than 30 cm away from the  objective lens.

A change has been made from CXD2535BR due to a modification of
IC121 on the BD board in this unit.
Accompanying this modification, a portion of the nonü]volatile
memory of IC171 (XC24CO1S) has been changed.
Conversely, when IC121 has been replaced, use CXD2535BR and
rewrite the contents of IC171.

Contents of non-volatile memories CXD2535BR

Address

CXD2535BR

15

93

2D

1A

2E

1A

(1) With the power switched off and the power plug plugged into a

socket. press the BASS/TREBLE button. CLOCK button, and MD
button more than one at a time in order.

(2) Rotate the JOG dial knob and display the “EEP MODE”.

When you press the YES key, the display changes to show
“EEP**@@”.
(Here, **indicates the address, and @@ indicates the data.)

(3) Rotate the JOG dial knob and display the  “EEP 15 @@”.
(4) When you press the CD SYNCHRO button, “EEP 15 @@>@@”

is displayed so then turn the JOG dial knob to show ügEEP 15
@@>93”

(5) Press the YES key and “COMPLETE” will appear for a moment

and data shown as “EEP 15 93” is being rewritten.

(6) Rewrite address 2D and address 2E, into 1A using steps (3) to (5)

above.

(7) When all changes are complete, press the NO key and display

“EEP MODE”.

(8)Press the REPEAT button. If no disc is loaded, the time is dis-

played, so unplug the power plug. If a disc is loaded, the disc is
ejected, then the time is displayed. Unplug the power plug from
the socket to end EEP rewrite mode. (See “How to end test mode”
below.)

Changes in the contents of non-volatile memory are not re-
flected until the power is switched off, then on.

l

Press the REPEAT button.

2 If no disc is loaded, the time is displayed. If a disc is loaded, the

disc is ejected, then the time is displayed .

3 Unplug the power plug from the socket.

      

              

When you press the  DISP  button, 

p button, and  EDIT button at the

same tilne, the system goes into key, fluorescent tube, jogr and LED
check mode.

r

Fluorescent tube check

       

All the lights light up. Then, each time you press the ENTER but-

ton, the display mode changes as shown below.

nAll lit n partially lit l n partially lit 2

r

LED check
When you turn the jog dial, the LEDS change froln all lit to indi-

vidually lit.

r

Key check
      

The EDIT/NO button puts the system into key/jog check mode .
When you press a button, the number is counted up.
However, pressing a button again that you already pressed does

not count up the number.

Turning the jog dial to the right increases the jog count display,

turning the jog dial to the left decreases the jog count.

When you have pressed all the buttons and “KEY= 0K” is dis-

played, pressing any button ends test Inode.