Sony MDS-JE520 Service Manual page 40

7. Then, rotate the AMS knob and display "LDPWR CHECK"
(C02).
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)
(For details of the method for checking
KMS 260A
this value, refer to "5-8. Recording and
27X40
Displaying IOP Information".)
B0825
Iop = 82.5 mA in this case
Iop (mA) = Digital voltmeter reading (mV)/1 ( )
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".
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 $
6.2 mW $ ", and "LD Wp
to be performed here.
5-11. TRAVERSE ADJUSTMENT
Connection :
".
Adjusting Procedure :
1. Connect an oscilloscope to CN110 pin 3 (TE) and CN110 pin
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
4. Rotate the AMS knob and display "EF MO ADJUS" (C10).
5. Press the YES button and display "EFB =
6. Rotate the AMS knob so that the waveform of the oscilloscope
", "LD
7. Press the YES button and save the result of adjustment to the
$ ". Nothing needs
8. Rotate the AMS knob so that the waveform of the oscilloscope
9. Press the YES button, and save the adjustment results in the
10. "EFB =
– 40 –
BD board
CN110 pin 3 (TE)
CN110 pin 2 (VC)
2 (VC) of the BD board.
pit.
(Laser power READ power/Focus servo ON/tracking servo OFF/
spindle (S) servo ON)
becomes the specified value.
(When the AMS knob is rotated, the
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)
VC
Specification A = B
non-volatile memory ("EFB =
moment. Then "EFB = MO-W" will be displayed).
becomes the specified value.
(When the AMS knob is rotated, the
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)
VC
Specification A = B
non-volatile memory. ("EFB =
moment.)
MO-P". will be displayed.
The optical pick-up moves to the pit area automatically and servo
is imposed.
Oscilloscope
V : 0.5 V/div
H : 10 ms/div
Input : DC mode
MO-R".
of "EFB= " changes
A
B
SAV" will be displayed for a
of "EFB- " changes
A
B
SAV" will be displayed for a