Sony HCD-VZ50MD Service Manual page 47

4. The display changes to "C1 =
5. If the C1 error rate is below 20, check that ADER is 00.
6. Press the CLEAR buttonwhile REC IT is lit, stop playback,
press the MD Z button while REC IT is off, and remove the
test disc.
6-15. FOCUS BIAS CHECK
Change the focus bias and check the focus tolerance amount.
Checking Procedure :
1. Load a continuously recorded test disc (MDW-74/GA-1).
(Refer to "6-5. Using the Continuously Recorded Disc".)
2. Move the multi-stick and display "CPLAY1 MODE"(C34).
3. Press the PUSH ENTER button twice and display "CPLAY1
MID".
4. Press the CLEAR button while REC IT is lit when "C1 =
AD = " is displayed.
5. Move the multi-stick and display "FBIAS CHECK"(C16).
6. Press the PUSH ENTER button and display "
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 PUSH ENTER button and display "
Check that the C1 error is below 100 and ADER is below 2.
8. Press the PUSH ENTER button and display "
Check that the C1 error is below 100 and ADER is below 2
9. Press the CLEAR button while REC IT is lit, next press the
MD Z button while REC IT is off and remove the continuously
recorded disc.
Note 1 : 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.
6-16. AUTO GAIN CONTROL OUTPUT LEVEL
ADJUSTMENT
Be sure to perform this adjustment when the optical pick-up is re-
placed.
If the adjustment results becomes "Adjust NG!", the optical pick-
up may be faulty or the servo system circuits may be abnormal.
6-16-1. CD Auto Gain Control Output Level Adjustment
Adjusting Procedure :
1. Insert the check disc (MD) TDYS-1.
2. Move the multi-stick to display "AG Set (CD)" (C11).
3. When the PUSH ENTER button is pressed, the adjustment will
be performed automatically.
"Complete!" will then be displayed momentarily when the value
is recorded in the non-volatile memory, after which the display
changes to "AG Set (CD)" (C11).
4. Press the MD Z button while REC IT is off and remove the
disc.
6-16-2. MO Auto Gain Control Output Level Adjustment
Adjusting Procedure :
1. Insert the reference disc (MDW-74/GA-1) for recording.
2. Move the multi-stick to display "AG Set (MO)" (C10).
3. When the PUSH ENTER button is pressed, the adjustment will
be performed automatically.
"Complete!" will then be displayed momentarily when the value
is recorded in the non-volatile memory, after which the display
changes to "AG Set (MO)" (C10).
4. Press the MD Z button while REC IT is off and remove the
disc.
AD = ".
/ c = ".
/ b = ".
/ a = ".
6-17. ADJUSTING POINTS AND CONNECTING
POINTS
[BD (MD) BOARD] (SIDE A)
CN101
D101
[BD (MD) BOARD] (SIDE B)
IC190
23 1 27
CN103
NOTE:It is useful to use the jig. for checking the waveform. (Refer
to Servicing Note on page 9.)
IC101
CN105
IC102
*
NOTE
IC151
IC195
1
CN102
1
7
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