Sony ZS-M35 Service Manual page 28

9. EF 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 oscilloscope
as shown in the following figure so that it can be seen more
clearly.
BD board
CN110 pin 3 (TEO)
CN110 pin 1 (VC)
Connection:
BD board
CN110 pin 3 (TEO)
CN110 pin 1 (VC)
Adjusting Procedure:
1. Connect an oscilloscope to CN110 pin 3 (TEO) and CN110
pin 1 (VC) on the BD board.
2. Load a disc (any available on the market). (Refer to Note 1)
3. Press the > button to move the optical pick-up outside the
pit.
4. Press the u (MD) or x (MD) button to display "EFBAL
ADJUST".
5. Press the [RADIO/BAND] button to display "EFB =
(Laser power READ power/Focus servo ON/tracking servo OFF/
spindle (S) servo ON)
6. Press the u (MD) or x (MD) button so that the waveform
of the oscilloscope becomes the specified value.
(When the u (MD) or x (MD) button is pressed, the
"EFB = " changes and the waveform changes ) In this adjust-
ment, waveform varies at intervals of approx. 2 %. Adjust the
waveform so that the specified value is satisfied as much as
possible.
(Read power traverse adjustment)
Traverse Waveform
VC
Specification A = B
7. Press the [RADIO/BAND] button and save the result of adjust-
ment to the non-volatile memory. ("EFB =
displayed for a moment. Then "EFB =
played)
oscilloscope
(DC range)
330 k Ω
+
–
10 pF
oscilloscope
(DC range)
+
V: 0.1 V/div
–
H: 10 ms/div
MO-R".
A
B
SAVE" will be
MO-W" will be dis-
8. Press the u (MD) or x (MD) button so that the waveform
of the oscilloscope becomes the specified value.
(When the JOG dial is turned, the
the waveform changes) In this adjustment, waveform varies at
intervals of approx. 2%. Adjust the waveform so that the speci-
fied value is satisfied as much as possible.
(Write power traverse adjustment)
Traverse Waveform
VC
Specification A = B
9. Press the [RADIO/BAND] button, and save the adjustment re-
sults in the non-volatile memory. ("EFB =
displayed for a moment)
10. "EFB = MO-P" will be displayed.
The optical pick-up moves to the pit area automatically and
servo is imposed.
11. Press the u (MD) or x (MD) button until the waveform 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
of
12. Press the [RADIO/BAND] button, and save the adjustment re-
sults in the non-volatile memory. ("EFB =
displayed for a moment)
Next "EFBAL ADJUST" is displayed. The disc stops rotating
automatically.
13. Press the Z (MD) button and take out the disc.
14. Load the check disc (MD) TDYS-1.
15. Press the [RADIO/BAND] button to display "EFB =
is imposed automatically.
16. Turn the JOG dial so that the waveform 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
– 28 –
of "EFB- " changes and
A
B
SAVE" will be
A
B
SABE" will be
CD". Servo
A
B