ZS-M30 - Sony Audio Service Manual (repair manual). Page 25

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12. FOCUS BIAS CHECK
Change the focus bias and check the focus tolerance amount.

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

CONTINUOUSLY-RECORDED DISC”)

2. Turn the JOG dial to display “CPLAY MODE”.
3. Press the  YES/ENTER  button twice to display “CPLAY

MID”.

4. Press the  NO/CANCEL  button when “C1 = 

  AD = 

 ”

is displayed.

5. Turn the JOG dial to display “FBIAS CHECK”.
6. Press the  YES/ENTER  button to display “ 

 / 

 c = 

 ”.

The first four digits indicate the C1 error rate, the two digits
after “  /  ” indicate ADER, and the 2 digits after “c =” indicate
the focus bias value.
Check that the C1 error is below 50 and ADER is below 2.

7.  Press the  YES/ENTER  button and display “ 

 / 

 b = 

 ”.

Check that the C1 error is about 200 and ADER is below 2.

8. Press the  YES/ENTER  button and display “ 

 / 

 a = 

 ”.

Check that the C1 error is about 200 and ADER is below 2.

9. Press the  NO/CANCEL  button, then press the  Z  (MD)

button and take out the disc.

 If the C1 error and ADER are above other than the speci-

fied value at points A (step 8. in the above) or B (step 7. in
the above), the focus bias adjustment may not have been
carried out properly. Adjust perform the beginning again.

Set the CD test mode when performing confirmations.
After completing the confirmation, release the CD test mode.

In the CD test mode, the set works as following sequence.

2.

 CD

test mode 2

Press the

  x  

(CD) button

Press the

  x  

(CD) button

3. STOP mode 2

4. FOCUS mode

5. ALL SERVO

ON mode 

6.  LPC OFF 

mode

7. TRACKING 

GAIN UP mode 

8. High speed

mode

 

Press the

  u  

(CD) button

Press the

  u  

(CD) button

Press the  

x

  (CD) 

button.

Press the  

u 

,(CD) 

 

button.

 

 

 

 

Press the  

x

  (CD) 

button.

Press the  

x

  (CD) 

button.

Press the  

x

  (CD) 

button.

Press the  

x

  (CD) 

button.

Press the  

u 

,(CD) 

button.

Press the  

u 

,(CD) 

button.

Press the  

u 

,(CD) 

button.

Press the  

u 

,(CD) 

button.

Press the  

u 

,(CD) 

button.

1.

 CD

test mode 1

Enter the
CD test mode

CD test mode