Traverse (E-F Balance) Adjustment - Sony HMD-M11 Service Manual

5-7. TRAVERSE (E-F BALANCE) ADJUSTMENT

Note 1: Data will be erased during MO reading if a recorded
disc is used in this adjustment.
Note 2: If the traverse waveform is not clear, connect the os-
cilloscope as shown in the following figure so that it
can be seen more clearly.
BD board
330 k Ω
CN110 pin 3 (TEO)
CN110 pin 2 (VC)
Connection:
BD board
CN110 pin 3 (TEO)
CN110 pin 2 (VC)
Adjusting Method:
1. Connect an oscilloscope to CN110 pin 3 (TEO) and CN110
pin 2 (VC) of the BD board.
2. Load a MO disc (any available on the market). (Refer to note
1.)
3. Press the VOL + button or VOL – button and move the op-
tical pick-up outside the pit.
4. Press the = 0 button or ) + button and display
"EFBAL ADJUST".
5. Press the YES button and display "EFB=
(Laser power READ power/Focus servo ON/tracking servo
OFF/spindle (S) servo ON)
6. Press the = 0 button or ) + button so that the
waveforms of the oscilloscope becomes the specified value.
(When the = 0 button or ) + button is pressed,
the " " of "EFB= MO-R" changes and the waveform
changes.)
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
(MO read power traverse adjustment)
(Traverse Waveform)
VC
specification: A=B
7. Press the YES button, and save the result of adjustment to
the non-volatile memory.
("EFB= SAVE" will be displayed for a moment. Then
"EFB= MO-W" will be displayed.)
oscilloscope
(DC range)
+
–
10 pF
oscilloscope
(DC range)
+
V: 0.1 V/div
–
H: 10 ms/div
MO-R".
A
B
8. Press the = 0 button or ) + button so that the
waveforms of the oscilloscope becomes the specified value.
(When the = 0 button or ) + button is pressed,
the " " of "EFB=
changes.)
In this adjustment, waveform varies at intervals of approx.
2%. Adjust the waveform so that the specified value is satis-
fied as much as possible.
(MO write power traverse adjustment)
(Traverse Waveform)
VC
specification: A=B
9. Press the YES button, and save the result of adjustment to
the non-volatile memory.
("EFB= SAVE" will be displayed for a moment. Then
"EFB= MO-P" will be displayed.)
10. The optical pick-up moves to the pit area automatically and
servo is imposed.
11. Press the = 0 button or ) + button until the wave-
forms of the oscilloscope moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
(Traverse Waveform)
VC
specification: A=B
12. Press the YES button, and save the result of adjustment to the
non-volatile memory.
("EFB= SAVE" will be displayed for a moment. Then
"EFBAL CD" will be displayed.)
The disc stops rotating automatically.
13. Press the 6 button and remove the MO disc.
14. Load the test disc TDYS-1.
15. Press the YES button and display "EFB=
Servo is imposed automatically.
16. Press the = 0 button or ) + button until the wave-
forms of the oscilloscope moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
(Traverse Waveform)
VC
specification: A=B
17. Press the YES button, and save the result of adjustment to the
non-volatile memory.
("EFB= SAVE" will be displayed for a moment. Then
"EFBAL ADJUST" will be displayed.)
18. Press the 6 button and remove the test disc TDYS-1.
– 35 –
MO-W" changes and the waveform
A
B
A
B
CD".
A
B