Sony HCD-J3MD Service Manual page 41

5-13. ERROR RATE CHECK
5-13-1. CD Error Rate Check
Checking Procedure :
1. Load a check disc (MD) TDYS-1.
2. Press the lm/TUNING – button or ML/TUNING +
button and display "CPLAY MODE".
3. Press the ENTER/YES "R" button twice and display "CPLAY
MID".
4. The display changes to "C1 =
5. Check that the C1 error rate is 20 or less.
6. Press the MENU/NO "R" button, stop playback, press the A
(MD) button, and remove the test disc.
5-13-2. MO Error Rate Check
Checking Procedure :
1. Load a test disc (MDW-74/AU-1).
2. Press the lm/TUNING – button or ML/TUNING +
button and display "CPLAY MODE".
3. Press the ENTER/YES "R" button and display "CPLAY MID".
4. The display changes to "C1 =
5. If the C1 error rate is 50 or less, check that ADER is 2 or less.
6. Press the MENU/NO "R" button, stop playback, press the A
(MD) button, and remove the test disc.
5-14. FOCUS BIAS CHECK
Change the focus bias and check the focus tolerance amount.
Checking Procedure :
1. Load a test disc (MDW-74/AU-1).
2. Press the lm/TUNING – button or ML/TUNING +
button and display "CPLAY MODE".
3. Press the ENTER/YES "R" button twice and display "CPLAY
MID".
4. Press the MENU/NO "R" button when "C1 =
is displayed.
5. Press the lm/TUNING – button or ML/TUNING +
button and display "FBIAS CHECK".
6. Press the ENTER/YES "R" 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 50 or less and ADER is 2 or less.
7. Press the ENTER/YES "R" button and display "
".
Check that the C1 error is 220 or less and ADER is 2 or less.
8. Press the ENTER/YES "R" button and display "
".
Check that the C1 error is 220 or less and ADER is 2 or less.
9. Press the MENU/NO "R" button, next press the A (MD) button,
and remove the test disc.
Note 1 : If the C1 error and ADER are above other than the specified
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.
AD = ".
AD = ".
AD = "
/ c =
/ b =
/ a =
5-15. Auto Gain Control Output Level
Adjustment
Be sure to perform this adjustment when the pickup is replaced.
If the adjustment results becomes "Adjust NG!", the pickup may be
faulty or the servo system circuits may be abnormal.
5-15-1. CD Auto Gain Control Output Level Adjustment
Adjusting Procedure :
1. Insert the check disc (MD) TDYS-1.
2. Press the lm/TUNING – button or ML/TUNING +
button to display "AG Set (CD)".
3. When the ENTER/YES "R" 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)".
4. Press the A (MD) button to remove the disc.
5-15-2. MO Auto Gain Control Output Level Adjustment
Adjusting Procedure :
1. Insert the reference disc (MDW-74/AU-1) for recording.
2. Press the lm/TUNING – button to display "AG Set (MO)".
3. When the ENTER/YES "R" 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)".
4. Press the A (MD) button to remove the disc.
5-15. ADJUSTING POINTS AND CONNECTING
POINTS
[BD (MD) BOARD] (SIDE A)
CN101
D101
GND
CN110
I+3V
IOP
TE
RF
VC
NOTE
IC171
[BD (MD) BOARD] (SIDE B)
IC192
NOTE:It is useful to use the jig for checking the waveform. (Refer
to Servicing Note on page 11.)
IC101
IC121
41