Sony HCD-C5 service manual Focus Bias Check, Play Check, Self-Recording/playback Check

HCD-C5

9.Press the ENTER/YES “R” button to display “EFB = MO- P”.

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

10.Observe the waveform of the oscilloscope, and check that the specified value is satisfied. Do not press the . “R” or

>“R” button.

Traverse Waveform

A

VC

B

Specified value : Below 10% offset value

Offset value (%) = IA – BI X 100 2 (A + B)

11.Press the ENTER/YES “R” button to display “EF MO CHECK” (C14).

The disc stops rotating automatically.

12.Press the MD Z button and take out the disc.

13.Load the check disc (TDYS-1).

14.Press the . “R” or > “R” button and display “EF CD CHECK” (C15).

15.Press the ENTER/YES “R” button to display “EFB = CD”. Servo is imposed automatically.

16.Observe the waveform of the oscilloscope, and check that the specified value is satisfied. Do not press the . “R” or

>“R” button.

Traverse Waveform

A

VC

B

Specified value : Below 10% offset value

Offset value (%) = IA – BI X 100 2 (A + B)

17.Press the ENTER/YES “R” button to display “EF CD CHECK” (C15).

18.Press the MD Z button and take out the check disc (TDYS-1).

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

6-7. Focus Bias Check

Change the focus bias and check the focus tolerance amount.

Procedure:

1.Load the test disc (MDW-74/GA-1).

2.Press the . “R” or > “R” button to display “CPLAY 1MODE” (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 CHECK” (C16).

6.Press the ENTER/YES “R” 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 20 and ADER is below 2.

7.Press the ENTER/YES “R” button to display “ / b =

”.

Check that the C1 error is about 100 and ADER is below 2.

8.Press the ENTER/YES “R” button to display “ / a =

”.

Check that the C1 error is about 100 and ADER is below 2.

9.Press the MENU/NO “R” button, then press the MD Z button and take out the test disc.

6-8. C PLAY Check

MO Error Rate Check

Procedure:

1.Load the test disc (MDW-74/GA-1).

2.Press the . “R” or > “R” button to display “CPLAY 1MODE” (C34).

3.Press the ENTER/YES “R” button to display “CPLAY 1MID”.

4.The display changes to “C = AD = ”.

5.If the C1 error rate is below 20, check that ADER is 00.

6.Press the MENU/NO “R” button to stop playback, then press the MD Z button and take out the test disc.

CD Error Rate Check

Procedure:

1.Load the check disc (TDYS-1).

2.Press the . “R” or > “R” button to display “CPLAY 1MODE” (C34).

3.Press the ENTER/YES “R” button to display “CPLAY 1MID”.

4.The display changes to “C = AD = )”.

5.Check that the C1 error rate is below 20.

6.Press the MENU/NO “R” button to stop playback, then press the MD Z button and take out the check disc.

6-9. Self-Recording/playback Check

Prepare a continuous recording disc using the unit to be repaired and check the error rate.

Procedure:

1.Load a recordable disc (blank disc).

2.Press the . “R” or > “R” button to display “CREC 1MODE” (C34).

3.Press the ENTER/YES “R” button to display “CREC 1MID”.

4.When recording starts, “ REC ” and display “CREC 1 @@@@”

(@@@@ is the address).

5.About 1 minute later, press the MENU/NO “R” button to stop continuous recording.

6.Press the . “R” or >“R” button to display “CPLAY 1 MODE” (C34).

7.Press the ENTER/YES “R” button to display “CPLAY 1 MID”.

8.“C = AD = )” will be displayed.

9.Check that the C1 error becomes below 20 and the AD error below 2.

10.Press the MENU/NO “R” button to stop playback, then press the MD Z button and take out the disc.

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