5.Then “LD 7.0 mW $ ” will be displayed.
6.Press the =0/MD/CD/TUNING – button or )+/ MD/CD/TUNING + button so that the reading of the laser power meter becomes 6.9 to 7.1 mW, press the ENTER/YES “R” but-
ton and save it.
Note : Do not perform the emission with 7.0 mW more than 15 seconds continuously.
7.Then, Press the =0/MD/CD/TUNING – button or )+/MD/CD/TUNING + button and display “LDPWR
CHECK”.
8.Press the ENTER/YES “R” button once and display “LD 0.9 mW $ ”. Check that the reading of the laser power meter be- come 0.85 to 0.91 mW.
9.Press the ENTER/YES “R” button once more and display “LD 7.0 mW $ ”. Check that the reading the laser power meter and digital volt meter satisfy the specified value.
Note down the digital voltmeter reading value.
Specified Value :
Laser power meter reading : 7.0 ± 0.1 mW
Digital voltmeter reading : Optical
(Optical
KMS260A | (For details of the method for checking | |
27X40 | this value, refer to | |
Displaying IOP Information”.) | ||
B0825 | ||
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N |
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Iop = 82.5 mA in this case
Iop (mA) = Digital voltmeter reading (mV)/1 (Ω)
10. Press the MENU/NO “R” button and display “LDPWR CHECK” and stop the laser emission.
(The MENU/NO “R” button is effective at all times to stop the laser emission.)
11. Press the =0/MD/CD/TUNING – button or)+/ MD/CD/TUNING + button to display “Iop.Write”.
12. Press the ENTER/YES “R” button. When the display becomes Ref=@@@.@ (@ is an arbitrary number), press the ENTER/
YES “R” button to display “Measu=@@@.@” (@ is an arbi- trary number).
13. The numbers which can be changed will blink. Input the Iop value noted down at step 9.
To select the number : Press the =0/MD/CD/TUNING –
button or )+/MD/CD/TUNING + button. To select the digit : Press the SYNC REC button.
14. When the ENTER/YES “R” button is pressed, “Complete!” will be displayed momentarily. The value will be recorded in the
Note 1: After step 4, each time the ENTER/YES “R” button is pressed, the display will be switched between “LD 0.7 mW
$ ”, “LD 6.2 mW $ ”, and “LD Wp $ ”. Nothing needs to be performed here.
5-11. TRAVERSE ADJUSTMENT
Connection :
Oscilloscope
BD (MD) board
CN110 pin 3 (TE)
CN110 pin 1 (VC)
V : 0.5 V/div
H : 10 ms/div
Input : DC mode
Adjusting Procedure :
1.Connect an oscilloscope to CN110 pin 3 (TE) and CN110 pin 1 (VC) of the BD board.
2.Load a disc (any available on the market). (Refer to Note 1.)
3.Press the )+/MD/CD/TUNING + button continuously and move the optical
4.Press the =0/MD/CD/TUNING – button or )+/ MD/CD/TUNING + button and display “EF MO ADJUST”.
5. Press the ENTER/YES “R” button and display “EFB = | MO- | ||
R”. |
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(Laser power READ power/Focus servo ON/tracking servo OFF/ spindle (S) servo ON)
6.Press the =0/MD/CD/TUNING – button or )+/ MD/CD/TUNING + button so that the waveform of the oscillo-
scope becomes the specified value.
(When the =0/MD/CD/TUNING – button or)+/ MD/CD/TUNING + button is pressed, the of “EFB= ” changes and the waveform changes.) In this adjustment, wave- form 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)
A
VC
B
Specification A = B
7.Press the ENTER/YES “R” button and save the result of ad-
justment to the
displayed for a moment. Then “EFB =
8.Press the =0/MD/CD/TUNING – button or )+/ MD/CD/TUNING + button so that the waveform of the oscillo-
scope becomes the specified value.
(When the =0/MD/CD/TUNING – button or)+/ MD/CD/TUNING + button is pressed, the of “EFB- ” changes and the waveform changes.) In this adjustment, wave- form varies at intervals of approx. 2%. Adjust the waveform so
that the specified value is satisfied as much as possible. (Write power traverse adjustment)
(Traverse Waveform)
A
VC
B
Specification A = B
36