Sony HCD-MD373 Manual Do Utilizador
34
9. Press the ENTER/YES “R” button display “EFB =
MO-P”.
Then, the optical pick-up moves to the pit area automatically
and servo is imposed.
and servo is imposed.
10. Observe the waveform of the oscilloscope, and check that the
specified value is satisfied. Do not press the
=0/MD/CD
TUNING– button or
)+/MD/CD/TUNING+ button.
(Traverse Waveform)
11. Press the ENTER/YES “R” button display “EF MO CHECK”
The disc stops rotating automatically.
12. Press the
6 (MD) button and remove the disc.
13. Load the check disc (MD) TDYS-1.
14. Press the
14. Press the
)+/MD/CD/TUNING + button and display
“EF CD CHECK”.
15. Press the ENTER/YES “R” button and 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
=0/MD/CD
TUNING– button or
)+/MD/CD/TUNING+ button.
(Traverse Waveform)
17. Press the ENTER/YES “R” button and display “EF CD
CHECK”.
18. Press the
6 (MD) button and remove the check disc (MD)
TDYS-1.
Note 1 : MO reading data will be erased during if a recorded disc is
used in this adjustment.
Note 2 : If the traverse waveform is not clear, connect the oscillo-
scope as shown in the following figure so that it can be
seen more clearly.
seen more clearly.
5-6-4. Focus Bias Check
Change the focus bias and check the focus tolerance amount.
Checking Procedure :
1. Load a test disk (MDW-74/AU-1).
2. Press the
Checking Procedure :
1. Load a test disk (MDW-74/AU-1).
2. Press the
=0/MD/CD/TUNING – button or )+/
MD/CD/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 =
AD =
”
is displayed.
5. Press the
=0/MD/CD/TUNING – button or )+/
MD/CD/TUNING + button and display “FBIAS CHECK”.
6. Press the ENTER/YES “R” 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 220 and ADER is below 2.
after “/” indicate ADER, and the 2 digits after “c =” indicate the
focus bias value.
Check that the C1 error is below 220 and ADER is below 2.
7. Press the ENTER/YES “R” button and display “
/
b =
”.
Check that the C1 error is below 220 and ADER is below 2.
8. Press the ENTER/YES “R” button and display “
/
a =
”.
Check that the C1 error is below 220 and ADER is below 2.
9. Press the MENU/NO “R” button, next press the
6 (MD) but-
ton, and remove the test disc.
5-6-5. C PLAY Checking
MO Error Rate Check
Checking Procedure :
1. Load a test disk (MDW-74/AU-1).
2. Press the
1. Load a test disk (MDW-74/AU-1).
2. Press the
=0/MD/CD/TUNING – button or )+/
MD/CD/TUNING + button and display “CPLAY MODE”.
3. Press the ENTER/YES “R” button and display “CPLAY MID”.
4. The display changes to “C1 =
4. The display changes to “C1 =
AD =
”.
5. If the C1 error rate is below 80, check that ADER is below 2.
6. Press the MENU/NO “R” button, stop playback, press the
6. Press the MENU/NO “R” button, stop playback, press the
6
(MD) button, and test disc.
CD Error Rate Check
Checking Procedure :
1. Load a check disc (MD) TDYS-1.
2. Press the
1. Load a check disc (MD) TDYS-1.
2. Press the
=0/MD/CD/TUNING – button or )+/
MD/CD/TUNING + button and display “CPLAY MODE”.
3. Press the ENTER/YES “R” button twice and display “CPLAY
MID”.
4. The display changes to “C1 =
AD =
”.
5. Check that the C1 error rate is below 50.
6. Press the MENU/NO “R” button, stop playback, press the
6. Press the MENU/NO “R” button, stop playback, press the
6
(MD) button, and the test disc.
5-6-6. Self-Recording/playback Check
Prepare a continuous recording disc using the unit to be repaired
and check the error rate.
and check the error rate.
Checking Procedure :
1. Insert a recordable disc (blank disc) into the unit.
2. Press the
1. Insert a recordable disc (blank disc) into the unit.
2. Press the
=0/MD/CD/TUNING – button or )+/
MD/CD/TUNING + button to display “CREC MODE”.
3. Press the ENTER/YES “R” button to display the “CREC MID”.
4. When recording starts,
4. When recording starts,
r REC indicator lights up displayed,
this becomes “CREC (@@@@)" (@@@@ is the address), and
recording starts.
recording starts.
5. About 1 minute later, press the MENU/NO “R” button to stop
continuous recording.
6. Press the
=0/MD/CD/TUNING – button or )+/
MD/CD/TUNING + button to display “C PLAY MODE”.
7. Press the ENTER/YES “R” button to display “C PLAY MID”.
VC
A
B
Specified value : Below 10% offset value
Offset value (%) = X 100
I
A – BI
2 (A + B)
VC
A
B
Specified value : Below 10% offset value
Offset value (%) = X 100
I
A – BI
2 (A + B)
330 k
Ω
Oscilloscope
10pF
BD (MD) board
CN110 pin
3
(TE)
CN110 pin
1
(VC)