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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.
[
AMS
]
2. Turn the
.
>
(C35).
[YES]
3. Press the
button to display "CREC 1MID".
Display "CREC 1(0300)" and start to recording.
4. Complete recording within 5 minutes.
[MENU/NO]
5. Press the
button and stop recording .
6. Press the
Z
button and remove the disc.
The above has been how to create a continuous recorded disc 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 "5-1. Parts Replacement and Adjustments" (see
page 20).
5-7-1. Temperature Compensation Offset Check
When performing adjustments, set the internal temperature and
room temperature to 22 to 28ºC.
Procedure:
[
AMS
]
1. Turn the
.
>
(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
Check the type and IOP value of the optical pick-up before checks.
(Refer to 5-4. How to Distinguish between Optical pick-up KMS-
260B and KMS-260E (see page 22), 5-9. Recording and Display-
ing the IOP Information (see page 26))
Connection:
Optical pick-up
objective lens
BD board
CN105 pin 1 (I+3V)
CN105 pin 2 (IOP)
knob to display "CREC 1MODE"
knob to display "TEMP CHECK"
laser
power meter
digital voltmeter
+
–
Procedure:
1. Set the laser power meter on the objective lens of the opti-
cal pick-up. (When it cannot be set properly, press
the
button or
button to move the optical pick-up.)
m
M
Connect the digital voltmeter to CN105 pin 1 (I+3V) and CN105
pin 2 (IOP).
[
AMS
2. Then, turn the
.
CHECK" (C13).
[YES]
3. Press the
button once to display "LD 0.9mW$ ". Check
that the reading of the laser power meter become 0.85 to 0.91
mW (KMS-260B) or 0.90 to 0.96 mW (KMS-260E).
[YES]
4. Press the
button once more to display " LD 7.0mW$ ".
Check that the reading the laser power meter and digital voltmeter
satisfy the specified value.
Specified Value:
Laser power meter reading : 7.0 ± 0.2 mW (KMS-260B)
7.25 ± 0.25 mW (KMS-260E)
Digital voltmeter reading : Optical pick-up displayed value ± 10%
(Optical pick-up label)
For details of the method for
KMS260B or E
checking this value, refer to
20101
"5-9. Recording and Displaying
B0825
the IOP Information"
lOP=82.5 mA in this case
lOP (mA) = Digital voltmeter reading (mV)/1 ( Ω )
[MENU/NO]
5. Press the
button to 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 "LD 0.7W$
"LD WP
$
". Nothing needs to be performed here.
Checking Location: BD board (see page 30)
5-7-3. Iop Compare
The current Iop value at laser power 7.0 mW 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:
[
AMS
]
1. Turn the
knob to display "Iop Compare" (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.
MDS-S9
]
knob to display "LDPWR
>
[YES]
button is pressed, the display
", "LD 6.2mW$
", and
23
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