27
KMS
260A
27X40
B0825
T
IOP = 82.5 mA in this case
IOP (mA) = Digital voltmeter reading (mV)/1 (
Ω
)
5. Then “MD LD 7.0 mW $
” will be displayed.
6. Rotate the
l L
knob so that the reading of the laser
power meter becomes 6.9 to 7.1 mW, press the ENTER/YES
button and save it.
Note :
Do not perform the emission with 7.0 mW more than 15
seconds continuously.
7. Then, rotate the
l L
knob and display “MD LDPWR
CHECK”.
8. Press the ENTER/YES button once and display “MD 0.9 mW
***
$
”. Check that the reading of the laser power meter be-
come 0.85 to 0.91 mW. (
***
means the IOP value)
9. Press the ENTER/YES button once more and display “MD 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 “MD LDPWR
CHECK” and stop the laser emission.
(The MENU/NO button is effective at all times to stop the
laser emission.)
11. Rotate the
l L
knob to display “MD Iop Write”.
12. Press the ENTER/YES button. When the display becomes
Ref=@@@.@ (@ is an arbitrary number), press the ENTER/
YES button to display “MD Measu=@@@.@” (@ is an arbi-
trary 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
l L
knob.
To select the digit : Press the SYNCHRO REC button.
Selection of digit : Press the SYNCHRO REC button.
14. When the ENTER/YES button is pressed, “Complete!” will
be displayed momentarily. The value will be recorded in the
non-volatile memory and the display will become “MD Iop
Write”.
Note 1:
After step 4, each time the ENTER/YES button is pressed,
the display will be switched between “MD 0.7 mW
***
$
”, “MD 6.2 mW
***
$
”, and “MD Wp
***
$
”. Nothing needs to be performed here.
(For details of the method for checking
this value, refer to “5-8. Recording and
Displaying the IOP Information”.)
5-11. TRAVERSE ADJUSTMENT
Connection :
Adjusting Procedure :
1. Connect an oscilloscope to CN110 pin
3
(TE) 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
M
button and move the optical pick-up outside the
pit.
4. Rotate the
l L
knob and display “MD EF MO
ADJUST”.
5. Press the ENTER/YES button and display “MD EFB =
MO-R”.
(Laser power READ power/Focus servo ON/tracking servo OFF/
spindle (S) servo ON)
6. Rotate the
l L
knob so that the waveform of the oscillo-
scope becomes the specified value.
(When the
l L
knob is rotated, the
of “MD EFB=
” changes and the waveform changes.) In this adjustment,
waveform varies at intervals of approx. 2%. Adjust the wave-
form so that the specified value is satisfied as much as possible.
(Read power traverse adjustment)
(Traverse Waveform)
7. Press the ENTER/YES button and save the result of adjustment
to the non-volatile memory (“MD EFB =
SAVE” will be dis-
played for a moment. Then “MD EFB =
MO-W” will be
displayed).
8. Rotate the
l L
knob so that the waveform of the oscillo-
scope becomes the specified value.
(When the
l L
knob is rotated, the
of “MD EFB-
”
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)
V : 0.5 V/div
H : 10 ms/div
Input : DC mode
Oscilloscope
BD board
CN110 pin
3
(TE)
CN110 pin
1
(VC)
VC
A
B
Specification A = B
VC
A
B
Specification A = B
