Sony MDS-JA333ES Service Manual page 30

5-6-3. Traverse Check
Note 1 : If the recorded disc is used for this adjustment, the
data is deleted.
Note 2 : If the traverse waveform is not clear, connect the
oscilloscope as shown below so that it can be seen more
clearly.
BD board
330kΩ
CN110 3-pin (TEO)
CN110 1-pin (VC)
Connection:
BD board
CN110 3-pin (TEO)
CN110 1-pin (VC)
Checking procedure:
1. Connect the oscilloscope to the CN110 3-pin (TEO) and the
CN110 1-pin (VC) of the BD board.
2. Load a recordable disc (any available on the market). (Refer to
Note 1.)
The disc is loaded by pushing the tray.
3. Press the M button to move the optical pick-up outside the
pit.
4. Rotate the lAMSL knob to display "EF MO CHECK"
(C14).
5. Press the YES button to display "EFB =
(Laser power READ power, focus servo ON, tracking servo OFF,
and spindle (S) servo ON are set)
6. Observe the waveform of the oscilloscope and confirm it is
within the specified value. Do not rotate the lAMSL
knob at that time.
(Read power traverse check)
(Traverse Waveform)
VC
Specification: Offset value 10% or less
AB
Offset value % =
2(A+B)
7. Press the YES button to display "EFB =
30
Oscilloscope (DC range)
10pF
Oscilloscope (DC range)
V : 0.5V/div
H : 10ms/div
MO-R".
A
B
× 100
MO-W".
8. Observe the waveform of the oscilloscope and confirm it that is
within the specified value. Do not rotate the lAMSL
knob at this time.
(Write power traverse check)
(Traverse Waveform)
VC
Specification: Offset value 10% or less
Offset value % =
2(A+B)
9. Press the YES button to display "EFB =
optical pick-up moves to the internal circumference of the pit
area automatically and servo is imposed.
10. Observe the waveform of the oscilloscope and confirm that it is
within the specified value. Do not rotate the lAMSL
knob at this time.
(Traverse Waveform)
VC
Specification: Offset value 10% or less
Offset value % =
2(A+B)
11. Press the YES button to display "EF MO CHECK" (C14).
The disc stops rotating automatically.
12. Press the A button to eject the disc.
13. Load the check disc (MD) TDYS-1.
14. Rotate the lAMSL knob to display "EF CD CHECK"
(C15).
15. Press the YES button to display "EFB =
imposed automatically.
16. Observe the waveform of the oscilloscope and confirm that it is
within the specified value. Do not rotate the lAMSL
knob at this time.
(Traverse Waveform)
VC
Specification: Offset value 10% or less
AB
Offset value % =
2(A+B)
17. Press the YES button to display "EF CD CHECK" (C15).
18. Press the A button to eject the check disc (MD) TDYS-1.
AB
× 100
MO-P". The
AB
× 100
CD". The servo is
× 100
A
B
A
B
A
B