40
MXD-D400
9. Press the
[YES]
button once more to display “L 8.65 mW $
”. Check that the reading the laser power meter and digital
voltmeter satisfy the specified value.
Note down the digital voltmeter reading value.
Specified Value:
Laser power meter reading : 8.1 to 8.7 mW (KMS-262A)
8.4 to 8.9 mW (KMS-262E)
Digital voltmeter reading : Value on the optical pick-up label
±
10%
(Optical pick-up label)
10. Press the
[MENU/NO]
button to display “LDPWR CHECK”
(C13) and stop the laser emission.
(The
[MENU/NO]
button is effective at all times to stop the
laser emission.)
11. Turn the
l
AMS
L
(MD) knob to display “Iop Write”
(C05).
12. Press the
[YES]
button. When the display becomes
Ref=@@@.@ (@ is an arbitrary number), press the
[YES]
button to display “Measu=@@@.@” (@ is an arbitrary num-
ber).
13. The numbers which can be changed will blink. Input the Iop
value noted down at step 9.
To select the number : Turn the
l
AMS
L
(MD) knob.
To select the digit : Press the
l
AMS
L
(MD) knob.
14. When the
[YES]
button is pressed, “Complete!” will be dis-
played momentarily. The value will be recorded in the non-
volatile memory and the display will become “Iop Write”
(C05).
Note:
After step 9, each time the
[YES]
button is pressed, the display
will be switched “L 0.73 mW $
”, “L 7.70 mW $
”, and “L
Wp
$
”. Nothing needs to be performed here.
Adjustment Location: BD (MD) board (see page 43)
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
IC12. Otherwise the optical pick-up check may deteriorate.
Note:
Perform this function with the optical pick-up set at room tempera-
ture.
Procedure:
1. Rotate the
l
AMS
L
(MD) knob to display “Iop NV
Save” (C06).
2. Press the
[YES]
button and display “Iop [stop]”.
3. After the display changes to “Iop =xxsave?”, press the
[YES]
button.
4. After “Complete!” is displayed momentarily, the display
changes to “Iop 8.4 mW”.
5. After the display changes to “Iop=yysave?”, press the
[YES]
button.
6. When “Complete!” is displayed, it means that Iop NV saving
has been completed.
5-13. TRAVERSE ADJUSTMENT
Connection:
Adjusting Procedure:
1. Connect an oscilloscope to CN105 pin
4
(TE) and CN105
pin
6
(VC) on the BD (MD) board.
2. Load a disc (any available on the market). (Refer to Note 1)
3. Turn the
l
AMS
L
(MD) knob to display “EF MO
ADJUS” (C07).
4. Press the
[YES]
button to display “EFB =
MO-R”.
(Laser power READ power/Focus servo ON/tracking servo
OFF/spindle (S) servo ON)
5. Turn the
l
AMS
L
(MD) knob so that the waveform of
the oscilloscope becomes the specified value.
(When the
l
AMS
L
(MD) knob is turned, the
of
“EFB=
” changes and the waveform changes.) In this ad-
justment, 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
6. Press the
[YES]
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).
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.
+
–
oscilloscope
(DC range)
10 pF
330 k
Ω
CN105 pin
4
(TE)
CN105 pin
6
(VC)
BD (MD) board
+
–
oscilloscope
(DC range)
V: 0.1 V/div
H: 10 ms/div
BD (MD) board
CN105 pin
4
(TE)
CN105 pin
6
(VC)
A
B
VC
Specification A = B
KMS
262E
20101
B0576
Iop = 57.6 mA in this case
Iop (mA) = Digital voltmeter reading (mV)/1 (
Ω
)
(For details of the method for
checking this value, refer to “5-9.
Recording and Displaying the Iop
Information”.)
