Sony MDS-W1, Service Manual

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KMS
260A
27X40
B0825
N
Iop = 82.5 mA in this case
Iop (mA) = Digital voltmeter reading (mV)/1 (
Ω
)
7. Then, rotate the AMS knob and display “LDPWR CHECK”
(S: 2).
8. Press the YES button once and display “LD 0.9 mW $ ”.
Check that the reading of the laser power meter become 0.85 to
0.91 mW.
9. Press the YES button once more and display “LD 7.0 mW $
”. Check that the reading the laser power meter and digital
volt meter satisfy the specified value.
Note down the digital voltmeter reading value.
Specified Value :
Laser power meter reading : 7.0 ± 0.1 mW
Digital voltmeter reading : Optical pick-up displayed value ± 10%
(Optical pick-up label)
10. Press the MENU/NO button and display “LDPWR CHECK”
and stop the laser emission.
(The MENU/NO button is effective at all times to stop the
laser emission.)
11. Rotate the AMS knob to display “Iop.Write” (S: 28).
12. Pr ess the YES button. When the display becomes
Ref=@@@.@ (@ is an arbitrary number), press the YES button
to display “Measu=@@@.@” (@ is an arbitrary number).
13. The numbers which can be changed will blink. Input the Iop
value noted down at step 9.
To select the number : Rotate the AMS knob.
To select the digit : Press the AMS knob
14. When the YES button is pressed, “Complete!” will be displayed
momentarily. The value will be recorded in the non-volatile
memory and the display will become “Iop Write”.
Note 1: After step 4, each time the YES button is pressed, the
display will be switched between “LD 0.7 mW $ ”, “LD
6.2 mW $ ”, and “LD Wp $ ”. Nothing needs
to be performed here.
(For details of the method for checking
this value, refer to “5-8. Recording and
Displaying IOP Information”.)
5-11. TRAVERSE ADJUSTMENT
Connection :
Adjusting Procedure :
1. Connect an oscilloscope to CN110 pin
3
(TEO) and CN110
pin
1
(VC) of the BD board.
2. Load a disc (any available on the market). (Refer to Note 1.)
3. Press the
)
button and move the optical pick-up outside the
pit.
4. Rotate the AMS knob and display “EF MO ADJUS” (S: 11).
5. Press the YES button and display “EFB =
MO-R”.
(Laser power READ power/Focus servo ON/tracking servo OFF/
spindle (S) servo ON)
6. Rotate the AMS knob so that the waveform of the oscilloscope
becomes the specified value.
(When the AMS knob is rotated, the
of “EFB= ” changes
and the waveform changes.) In this adjustment, waveform var-
ies 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)
7. Press the YES button and save the result of adjustment to the
non-volatile memory (“EFB = SAV” will be displayed for a
moment. Then “EFB = MO-W” will be displayed).
8. Rotate the AMS knob so that the waveform of the oscilloscope
becomes the specified value.
(When the AMS knob is rotated, the
of “EFB- ” changes
and the waveform changes.) In this adjustment, waveform var-
ies at intervals of approx. 2%. Adjust the waveform so that the
specified value is satisfied as much as possible.
(Write power traverse adjustment)
(Traverse Waveform)
9. Press the YES button, and save the adjustment results in the
non-volatile memory. (“EFB = SAV” will be 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.
V : 0.5 V/div
H : 10 ms/div
Input : DC mode
Oscilloscope
BD board
CN110 pin
3
(TEO)
CN110 pin
1
(VC)
VC
A
B
Specification A = B
VC
A
B
Specification A = B