6-6. LASER POWER ADJUSTMENT6-7. TRAVERSE ADJUSTMENT
Connection :Laser powerConnection :
Oscilloscope
meter
BD (MD) board
TP (TEO)
Optical pick-upTP (VC)
objective lens
Adjusting Procedure:
Digital volt meter
1. Connect an oscilloscope to TP (TEO) and TP (VC) of CN110 of
the BD (MD) board.
2. Load a recordable disc (any available on the market). (Refer to
BD (MD) board
TP (I+3V)Note 1.)
TP (IOP)3. Press the = 0 or ) + button to move the optical
pick-up outside the pit.
4. Rotate the VOLUME knob to display OEFBAL ADJUST�.
Adjusting Procedure:
5. Press the p (CD) button to display MO-R�.OEFB =
1. Set the laser power meter on the objective lens of the optical
(Laser power READ power/Focus servo ON/tracking servo OFF/
pick-up from the disc slot. (If it cannot be set properly, press the
spindle (S) servo ON)
= 0 or ) + button to move the optical pick-up).
6. Rotate the VOLUME knob so that the oscilloscope waveform
Connect the digital voltmeter to TP (I+3V) and TP (IOP) of the
becomes the specified value. (Rotating the VOLUME knob
BD (MD) board.
changes the OEFB= � value and the waveform.) The waveform
2. Rotate the VOLUME knob to display OLDPWR ADJUST�.
changes by about 2% everytime when adjusted. Adjust as close
(Laser power: For adjustment)
as possible to the specified value.
3. Press the p (CD) button once to display OLD 0.9 mW $ �.
(Read power traverse adjustment)
4. Rotate the VOLUME knob so that the laser power meter reads
0.86 to 0.92 mW. Set the range knob of the laser power meter to
(Traverse Waveform)
10 mW, press the p (CD) button, and save the adjustment results
in the non-volatile memory. (OLD SA� is displayVE $ ed
momentarily.)A
5. OLD 7.0 mW $ � is next displayed.
VC
6. Rotate the VOLUME knob so that the laser power meter reads
6.9 to 7.1 mW, press the p (CD) button, and save the adjustmentB
results in the non-volatile memory.� (OLD SA is displaVE $ yed
momentarily.)Specified value : A = B
Note:Do not emit 7.0 mW continuously for more than 15 seconds.
7. Rotate the VOLUME knob to display OLDPWR CHECK�.
7. Press the p (CD) button and save the adjustment results in the
8. Press the p (CD) button once to display OLD 0.9 mW $ �.
non-volatile memory (displayed as SAOEFB = VE�
Check that the laser power meter reading is 0.85 to 0.91 mW.
momentarliy and then displayed as OEFB = MO-W�).
9. Press the p (CD) button another time to diaplay OLD 7.0 mW
8. Rotate the VOLUME knob so that the oscilloscope waveform
$ �.
becomes the specified value.
Check that the readings of the laser power meter and digital
(Rotating the VOLUME knob changes the � valueOEFB=
voltmeter become the specified value.
and the waveform.) The waveform changes by about 2%
everytime when adjusted. Adjust as close as possible to the
Specified Value :
specified value.
Laser power meter reading : 7.0 ? 0.1 mW
(Write Power Traverse Adjustment)
Digital voltmeter reading : Value displayed on optical pick-up label
? 10%
(Traverse Waveform)
(Optical pick-up label)
A
KMS
260A
27X40VC
B0825NB
Iop = 82.5 mA in this case
Iop (mA) = Digital voltmeter reading (mV)/1 (W)Specified value : A = B
10. Press the ^ (CD) button to display OLDPWR CHECK� and
9. Press the p (CD) button to save the adjustment results in the
stop the laser emission.
(The ^ (CD) button is effective at all times to stop the lasernon-volatile memory (displayed as SAOEFB = VE�
emission.)momentarliy).
� 25 � |
ACEC
