![background image](http://html.mh-extra.com/html/sony/hcd-vz50md/hcd-vz50md_service-manual_1329759047.webp)
47
4. The display changes to “C1 =
AD =
”.
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 “
/
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 PUSH ENTER button and display “
/
b =
”.
Check that the C1 error is below 100 and ADER is below 2.
8. Press the PUSH ENTER button and display “
/
a =
”.
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.
NOTE:It is useful to use the jig. for checking the waveform. (Refer
to Servicing Note on page 9.)
[BD (MD) BOARD] (SIDE B)
D101
IC151
23
1 27
1
1
7
IC101
CN101
CN103
CN102
IC195
IC190
CN105
IC102
*
NOTE
6-17. ADJUSTING POINTS AND CONNECTING
POINTS
[BD (MD) BOARD] (SIDE A)
Summary of Contents for HCD-VZ50MD
Page 8: ...8 BD CD board BD CD BOARD To repair the BD CD board remove the bottom plate Bottom view ...
Page 57: ...HCD VZ50MD 57 57 7 4 SCHEMATIC DIAGRAM DECK SECTION E Page 64 TO MAIN BOARD 16 ...
Page 64: ...HCD VZ50MD 64 64 7 11 SCHEMATIC DIAGRAM MAIN 1 4 SECTION ...
Page 65: ...HCD VZ50MD 65 65 7 12 SCHEMATIC DIAGRAM MAIN 2 4 SECTION See page 89 for IC Block Diagrams ...
Page 67: ...HCD VZ50MD 67 67 7 14 SCHEMATIC DIAGRAM MAIN 4 4 SECTION See page 89 for IC Block Diagrams ...
Page 71: ...HCD VZ50MD 71 71 7 18 SCHEMATIC DIAGRAM DIGITAL 2 2 SECTION See page 92 for IC Block Diagrams ...
Page 73: ...HCD VZ50MD 73 73 7 20 SCHEMATIC DIAGRAM AMP SECTION ...
Page 77: ...HCD VZ50MD 77 77 7 24 SCHEMATIC DIAGRAM SWITCH SECTION ...
Page 83: ...HCD VZ50MD 83 83 7 32 SCHEMATIC DIAGRAM POWER SUPPLY SECTION ...