CMT-DC500MD, HCD-J300 - Sony Audio Service Manual (repair manual). Page 37

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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.

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  Z  (MD) 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  Z  (MD) button and take out the  check disc.

Adjustment Location: BD board (see page 39)

Procedure:
1. Load the continuously-recorded disc.  (Refer to “5.  USING

THE CONTINUOUSLY RECORDED DISC” (See page 32))

2. Press the

.  “R”

or

>  “R”

button to display “CPLAY1

MODE” (C34).

3. Press the

ENTER/YES “R”

button to display “CPLAY 1MID”.

4. Press the

MENU/NO “R”

button when “C = 

 AD = 

)” is

displayed.

5. Press the

.  “R”

or

>  “R”

button to display “FBIAS

ADJUST” (C09).

6. Press the

ENTER/YES “R”

button to display “

/

 a = 

”.

The first four digits indicate the C1 error rate, the two digits
after “/ ” indicate ADER, and the 2 digits after “a =” indicate
the focus bias value.

7. Press the 

 > “R”

button and find the focus bias value at which

the C1 error rate becomes about 200 (refer to Note 2).

8. Press the

ENTER/YES “R”

button to display “

/

 b = 

”.

9. Press the

. “R”

button and find the focus bias value at which

the C1 error rate becomes about 200.

10. Press the

ENTER/YES “R”

button to display “

/

 c = 

”.

11. Check that the C1 error rate is below 20 and ADER is 00. Then

press the

ENTER/YES “R”

button.

12. If the “(

)” in “

 - 

 - 

 (

)” is above 20, press the

ENTER/

YES “R”

 button.

If below 20, press the

MENU/NO  “R”

button and repeat the

adjustment from step 2.

13. Press thet  Z  (MD) button and take out the disc.

Note 1: The relation between the C1 error and focus bias is as shown in

the following figure. Find points A and B in the following figure
using the above adjustment. The focal point position C is auto-
matically calculated from points A and B.

Note 2: As the C1 error rate changes, perform the adjustment using the

average vale.

A

B

VC

Specification A = B

A

B

VC

Specification A = B

A

B

VC

Specification A = B

C1 error

about 
200

B

C

A

Focus bias value