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5. 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. Press the . "R" or > "R" button and display "CREC 1MODE"
(C35).
3. Press the ENTER/YES "R" button again to display "CREC 1
MID".
Display "CREC 1(0300)" and start to recording.
4. Complete recording within 5 minutes.
5. Press the MENU/NO "R" button and stop recording .
6. Press the MD Z 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.
6. 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 Adjustments
in MD" (see page 30).
6-1. Temperature Compensation Offset Check
When performing adjustments, set the internal temperature and room
temperature to 22 to 28ºC.
Procedure:
1. Press the
or
. "R"
> "R"
CHECK" (C12).
2. Press the
ENTER/YES "R"
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.)
6-2. Laser Power Check
Before starting adjustment;
The laser power adjustment value changes depending upon the types
of the optical pick-up (KMS-260B or KMS-260E).
Check the type of the optical pick-up before starting adjustment.
(See the illustrations "The method of identifying the optical pick-
up" on page 41)
Before checking, check the Iop value of the optical pick-up.
(Refer to 8. Recording and Displaying the Iop Information (see page
40))
Connection:
Optical pick-up
objective lens
BD (MD) board
CN105 pin 1 (I+3V)
CN105 pin 2 (IOP)
button to display "TEMP
button.
laser
power meter
digital voltmeter
+
–
Procedure:
1. Set the laser power meter on the objective lens of the optical
pick-up. (When it cannot be set properly, press the m
or M
"R"
button to move the optical pick-up.)
Connect the digital volt meter to CN105 pin 1 (I+3V) and
CN105 pin 2 (IOP).
2. Then, press the
. "R"
"LDPWR CHECK" (C13).
3. Press the
button once and display "LD 0.9mW$
ENTER/YES "R"
". Check that the reading of the laser power meter becomes
specified value.
KMS-260B
SPECIFIED VALUE
KMS-260E
4. Press the
ENTER/YES "R"
7.0mW$
". Check that the reading the laser power meter and
digital volt meter satisfy the specified value.
Specified Value:
Laser power meter reading :
KMS-260B
7.0 to 0.2 mW
KMS-260E
7.25 to 0.25 mW
Digital voltmeter reading : Optical pick-up displayed value
(Optical pick-up label)
For details of the method for
KMS260B
checking this value, refer to
20101
"8. Recording and Displaying
H0576
the Iop Information"
lOP = 57.6 mA in this case
lOP (mA) = Digital voltmeter reading (mV)/1 ( )
5. Press the MENU/NO "R" button and display "LDPWR
CHECK" (C13) and stop the laser emission.
(The MENU/NO "R" button is effective at all times to stop the
laser emission.)
Note: After step 4, each time the
display will be switched to "LD 0.7W$
"LD WP
$
". Nothing needs to be performed here.
Checking Location: BD (MD) board (see page 44)
6-3. 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 tempera-
ture.
Procedure:
1. Press the . "R" or > "R" button to display "Iop Compare"
(C27).
2. Press the ENTER/YES "R" 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.
4. Press the MENU/NO "R" button to end.
HCD-C5
"R"
button
or
button and display
> "R"
0.85 to 0.91 mW
0.90 to 0.96 mW
button once more and display " LD
ENTER/YES "R"
button is pressed, the
"and "LD 6.2mW$
10%
"
37
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