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5-5. Creating Continuos Recorded Disc
• This disc is used in focus bias adjustment and error rate check.
The following describes how to create a continuos recording disc.
1. Load a disc (blank disc) commercially available.
the disc is loaded by pushing the tray.
2. Rotate the
l
AMS
L
knob and display “CREC 1MODE”
(C35).
3. Press the YES button to display “CMEC 1MID”.
“CREC1 (0300)” is displayed for a moment and recording starts.
4. Complete recording within 5 minutes.
5. Press the MENU/NO button to stop recording.
6. Press the
A
button to eject the disc.
The above has been how to create a continuos recording data for
the focus bias adjustment and error rate check.
Note:
• Be careful not to apply vibration during continuos recording.
5-6. Check before Repairing
This check aims at locating the approximate position of cause of
trouble before starting to replace parts using specifications.
For detailed information, refer to [Checks before Part Replacement
and Adjustment] of Service note.
5-6-1. Temperature Compensation Offset Check
Before adjustment, set the internal temperature and the ambient
temperature are between 22 and 28
°
C.
Checking procedure:
1. Rotate the
l
AMS
L
knob to display “TEMP CHECK”
(C12).
2. Press the YES button.
3. It is OK when “T=@@(##)[OK” appears. It is NG when
“T=@@(##)[NG” appears. (@@ is the current value. ## is the
value that is written in the non-volatile memory.)
5-6-2. Laser Power Check
Before check:
• Refer to Section 1 “Service note” How to open the disc tray when
power switch is turned off, and laser power check.
• Check the IOP value of optical pick-up. (Refer to Section 5-8
“Recording and displaying the IOP information”.)
Connection:
Checking procedure:
1. Insert the laser power meter from the disc inlet and set it on the
objective lens of the optical pick-up. (When it cannot be set
properly, press the
m
button and
M
button to move the
optical pick-up.)
Connect the digital voltmeter to CN110
5
-pin (I+3V) and the
CN110
4
-pin (IOP).
2. Rotate the
l
AMS
L
knob to display “LDPWR CHECK”
(C13).
3. Press the YES button once to display “LD 0.9mW $ ”.
Confirm that the reading of the laser power meter is 0.84 to
0.92 mW.
4. Press the YES button once again to display “LD 7.0mW $ ”.
Confirm that the readings of the laser power meter and digital
bolt meter satisfy the specified value.
5. Then press the YES button once again to display “LD
6.2mW $ ”.
Specification:
Laser power meter reading: 7.0 ± 0.2 mW
Digital bolt meter reading: Optical pick-up displayed value ± 10 %
6. Press the MENU/NO button to display “LDPWR CHECK”
(C13) and stop laser emission.
(The MENU/NO button is effective at all times to stop the
laser emission.)
Note 1
: After step 4, the display of “LD 0.7mW$ ” “LD
6.2mW$ ”, “LD Wp $ ” is switched every
time when pressing the YES button. Operation is not
necessary for these displays.
Laser power meter
Optical pick-up
objective lens
Digital voltmeter
CN110
5
-pin (I+3V)
CN110
4
-pin (IOP)
BD board
KMS
260B
24391
H0528
(For the checking procedure of
this value, refer to Section 5-8
“Recording and displaying the
IOP information”.)
IOP = 52.8 mA in this case
IOP (mA) = digital bolt meter reading (mV)/1 (W)
(Optical pick-up label)