CMT-C7NT, HCD-C7NT - Sony Audio Service Manual (repair manual). Page 42

42

Procedure:
1. Connect an oscilloscope to CN105 pin 4 (TE) and CN105 pin

6

 (VC) on the BD (MD) board.

2. Load a disc (any available on the market). (Refer to Note 1)
3. Press the  M

 “R”

  button to move the optical pick-up outside

the pit.

4. Press the  . 

“R”

  or  >

 “R”

  button to display “EF MO

ADJUST” (C07).

5. Press the

ENTER/YES “R”

button to display “EFB =     MO-

R”. (Laser power READ power/Focus servo ON/tracking servo
OFF/spindle (S) servo ON)

6. Press the  . 

“R”

  or  >

 “R”

  button so that the waveform of

the oscilloscope becomes the specified value.
(When the  . 

“R”

  or  >

 “R”

  button  is pressed, the     of

“EFB=    ” changes and the waveform changes) In this adjustment,
waveform varies at intervals of approx. 2%. Adjust the waveform
so that the specified value is satisfied as much as possible.
(Read power traverse adjustment)

Traverse Waveform

7. Press the  

ENTER/YES “R”  

button and save the result of

adjustment to the non-volatile memory (“EFB =      SAVE”
will be displayed for a moment. Then “EFB =     MO-W” will
be displayed).

8. Press the  . 

“R”

  or  >

 “R”

  button so that the waveform of

the oscilloscope becomes the specified value.
(When the  . 

“R”

  or  >

 “R”

  button is pressed, the     of

“EFB=    ”  changes and the waveform changes) In this
adjustment, waveform varies at intervals of approx. 2%. Adjust
the waveform so that the specified value is satisfied as much as
possible. (Write power traverse adjustment)

Traverse Waveform

9. Press the  

ENTER/YES “R”  

button, and save the adjustment

results in the non-volatile memory. (“EFB =     SAVE” will be
displayed for a moment)

10. “EFB =     MO-P” will be displayed.

The optical pick-up moves to the pit area automatically and
servo is imposed.

A

B

VC

Specification A = B

11. Press the  .

 “R”

  or  >

 “R”

  button until the waveform of

the oscilloscope moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.

Traverse Waveform

12. Press the  

ENTER/YES “R”  

button, and save the adjustment

results in the non-volatile memory. (“EFB =     SAVE” will be
displayed for a moment)
Next “EF MO ADJUST” (C07) is displayed. The disc stops
rotating automatically.

13. Press the  

MD 

Z  button and take out the disc.

14. Load the check disc (TDYS-1).
15. Press the  .

 “R”

  or  >

 “R”

  button to display “EF CD

ADJUST” (C08).

16. Press the  

ENTER/YES “R”  

button to display “EFB =     CD”.

Servo is imposed automatically.

17. Press the  . 

“R”

  or  >

 “R”

  button so that the waveform of

the oscilloscope moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.

Traverse Waveform

18. Press the  

ENTER/YES “R”  

button, display “EFB =     SAVE”

for a moment and save the adjustment results in the non-volatile
memory.
Next “EF CD ADJUST” (C08) will be displayed.

19. Press the  

MD 

Z  button and take out the  check disc.

Adjustment Location: BD (MD) board (see page 44)

A

B

VC

Specification A = B

A

B

VC

Specification A = B

A

B

VC

Specification A = B