Sony MDS-PC3 - Manual (Page 31)

31
KMS 260B
20101
H0576
Iop = 57.6 mA in this case
Iop (mA) = Digital voltmeter reading (mV)/1 (
Ω )
7. Then, rotate the AMS knob and display “LDPWR CHECK”
(C13).
8. Press the @/1 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 @/1 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 ± 0.2 mW
Digital voltmeter reading : Optical pick-up displayed value ± 10%
(Optical pick-up label)
10. Press the x/Z button and display “LDPWR CHECK” (C13)
and stop the laser emission.
(The x/Z button is effective at all times to stop the laser
emission.)
11. Rotate the AMS knob to display “Iop Write” (C05).
12. Press the @/1 button. When the display becomes
Ref=@@@.@ (@ is an arbitrary number), press the @/1 button
to display “Measu=@@@.@” (@ is an arbitrary number).
13. The numbers which can be changed will blink. Input 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 @/1 button is pressed, “Complete! !” will be dis-
played momentarily. The value will be recorded in the non-vola-
tile memory and the display will become “Iop Write” (C05).
Note 1: After step 4, each time the @/1 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”.)
5-12. TRAVERSE ADJUSTMENT
Connection :
Adjusting Procedure :
1. Connect an oscilloscope to CN105 pin 4 (TE) and CN105 pin
6 (VC) of the BD board.
2. Load a test disc (MDW-74/GA-1). (Refer to Note 1.)
3. Rotate the AMS knob and display “EF MO ADJUST” (C07).
4. Press the @/1 button and display “EFB =
MO-R”.
(Laser power READ power/Focus servo ON/tracking servo OFF/
spindle (S) servo ON)
5. 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)
6. Press the @/1 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).
7. Rotate the AMS knob so that the waveform of the oscilloscope
becomes the specified value.
(When the AMS knob is rotated, the
of “EFB- MO-W”
changes and the waveform changes.) In this adjustment, wave-
form varies 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)
8. Press the @/1 button, and save the adjustment results in the
non-volatile memory. (“EFB = SAVE” will be displayed for
a moment.)
9. “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
CN105 pin 4 (TE)
CN105 pin 6 (VC)
VC
A
B
Specification A = B
VC
A
B
Specification A = B
R
5-11. Iop NV SAVE
Write the reference values in the nonvolatile memory to perform
“Iop Compare”. As this involves rewriting the reference values, do
not perform this procedure except when adjusting the laser power
during replacement of the optical pick-up and when replacing the
IC102. Otherwise the optical pick-up check may deteriorate.
Note: Perform this function with the optical pick-up set at room
temperature.
Procedure
1. Rotate the AMS knob to display “Iop NV Save” (C06).
2. Press the @/1 button and display “Iop [stop]”.
3. After the display changes to “Iop =xxsave?”, press the @/1
button.
4. After “Complete!” is displayed momentarily, the display changes
to “Iop 7.0 mW”.
5. After the display changes to “Iop=yysave?”, press the @/1
button.
6. When “Complete!” is displayed, it means that Iop NV saving
has been completed.