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MXD-D400
5-6.
USING THE CONTINUOUSLY RECORDED
DISC
* This disc is used in focus bias adjustment and error rate check.
The following describes how to create a continuous recording
disc.
1. Insert a disc (blank disc) commercially available.
2. Rotate the
l AMS L
2MODE" (C37).
[YES]
3. Press the
button again to display "CREC 2MID".
Display "CREC 2(0300)" and start to recording.
4. Complete recording within 5 minutes.
[MENU/NO]
5. Press the
button and stop recording .
[EJECT]
6. Press the
button and remove the disc.
The above has been how to create a continuous recorded data for
the focus bias adjustment and error rate check.
Note: Be careful not to apply vibration during continuous recording.
5-7.
CHECKS PRIOR TO REPAIRS
These checks are performed before replacing parts according to
"approximate specifications" to determine the faulty locations. For
details, refer to "Checks Prior to Parts Replacement and Adjust-
ments" (see page 13).
5-7-1. Temperature Compensation Offset Check
When performing adjustments, set the internal temperature and
room temperature to 22 to 28ºC.
Checking Procedure:
1. Rotate the
l AMS L
CHECK" (C12).
[YES]
2. Press the
button.
3. "T=@@(##) [OK" should be displayed. If "T=@@ (##) [NG]"
is displayed, it means that the results are bad.
(@@ indicates the current value set, and ## indicates the value
written in the non-volatile memory.)
5-7-2. Laser Power Check
Before checking, check the Iop value of the optical pick-up.
(Refer to 5-9. Recording and Displaying the Iop Information (see
page 39.)
Connection:
Optical pick-up
objective lens
BD (MD) board
CN105 pin 1 (I +3 V)
CN105 pin 2 (IOP)
36
(MD) knob and display "CREC
(MD) knob to display "TEMP
laser
power meter
digital voltmeter
+
–
Checking Procedure:
1. Set the laser power meter on the objective lens of the optical
pick-up.
Connect the digital volt meter to CN105 pin 1 (I+3V) and
CN105 pin 2 (IOP).
2. Then, rotate the
l AMS L
"LDPWR CHECK" (C13).
[YES]
3. Press the
button once and display "L 0.93 mW $
Check that the reading of the laser power meter becomes the
specified value.
Note: Never allow the laser emission at 8.65 mW for 1.5 seconds or longer.
Specified Value: 0.84 to 0.92 mW (KMS-262A)
0.90 to 0.96 mW (KMS-262E)
[YES]
4. Press the
button once more and display " L 8.65 mW $
". Check that the reading the laser power meter and digital
volt meter satisfy the specified 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 : Optical pick-up displayed value ± 10%
(Optical pick-up label)
(For details of the method for
KMS
262E
checking this value, refer to "5-9.
20101
Recording and Displaying the Iop
B0576
Information".)
Iop = 57.6 mA in this case
Iop (mA) = Digital voltmeter reading (mV)/1 ( Ω )
[MENU/NO]
5. Press the
button and display "LDPWR CHECK"
(C13) and stop the laser emission.
[MENU/NO]
(The
button is effective at all times to stop the
laser emission.)
Note: After step 4, each time the
will be switched between "L 0.73 mW $
and "L Wp
$
". Nothing needs to be performed here.
Check Location: BD (MD) board (see page 43)
5-7-3. Iop Compare
The current Iop value at laser power 8.65 mW (KMS-262E) or 8.4
mW (KMS-262A) output and reference Iop value (set at shipment)
written in the nonvolatile memory are compared, and the rate of
increase/decrease will be displayed in percentage.
Note: Perform this function with the optical pick-up set at room
temperature.
Procedure:
1. Rotate the
l AMS L
pare" (C27).
[YES]
2. Press the
button and start measurements.
3. When measurements complete, the display changes to
"±xx%yy".
xx is the percentage of increase/decrease, and OK or NG is
displayed at yy to indicate whether the percentage of increase/
decrease is within the allowable range.
[MENU/NO]
4. Press the
button to end this mode.
(MD) knob and display
[YES]
button is pressed, the display
", "L 7.70 mW $
(MD) knob to display "Iop Com-
".
",
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