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– 27 –
6-6.
LASER POWER ADJUSTMENT
Connection :
KMS
260A
27X40
B0825
N
Iop = 82.5 mA in this case
Iop (mA) = Digital voltmeter reading (mV)/1 (
Ω
)
6-7.
TRAVERSE ADJUSTMENT
Connection :
Adjusting Procedure:
1. Connect an oscilloscope to TP69 (TEO) and TP1003 (VC) of
the BD (MD) board.
2. Load a recordable disc (any available on the market). (Refer
to Note 1.)
3. Press the
=0
or
)+
button to move the optical
pick-up outside the pit.
4. Press the
[/–]
button to display “EFBAL ADJUST”.
5. Press the
p
(CD) button to display “EFB =
MO-R”.
(Laser power READ power/Focus servo ON/tracking servo
OFF/spindle (S) servo ON)
6. Press the
[/–]
button so that the oscilloscope wave-
form becomes the specified value. (Press the
[/–]
button changes the “EFB=
” value and the waveform.) The
waveform changes by about 2% everytime when adjusted.
Adjust as close as possible to the specified value.
(Read power traverse adjustment)
(Traverse Waveform)
7. Press the
p
(CD) button and save the adjustment results in
the non-volatile memory (displayed as “EFB =
SAVE”
momentarliy and then displayed as “EFB =
MO-W”).
8. Press the
[/–]
button so that the oscilloscope wave-
form becomes the specified value.
(Pressing the
[/–]
button changes the “EFB=
”
value and the waveform.) The waveform changes by about 2%
everytime when adjusted. Adjust as close as possible to the
specified value.
(Write Power Traverse Adjustment)
(Traverse Waveform)
Laser power
meter
Optical pick-up
objective lens
Digital volt meter
TP (I+3V)
TP (IOP)
BD (MD) board
Adjusting Procedure:
1. Set the laser power meter on the objective lens of the optical pick-
up from the disc slot. (If it cannot be set properly, press the
=0
or
)+
button to move the optical pick-up).
Connect the digital voltmeter to TP (I+3V) and TP (IOP) of
the BD (MD) board.
2. Press the
[/–]
button to display “LDPWR ADJUST”.
(Laser power: For adjustment)
3. Press the
p
(CD) button once to display “LD 0.9 mW $
”.
4. Press the
[/–]
button so that the laser power meter
reads 0.86 to 0.92 mW. Set the range knob of the laser power
meter to 10 mW, press the
p
(CD) button, and save the ad-
justment results in the non-volatile memory. (“LD SAVE $
” is displayed momentarily.)
5. “LD 7.0 mW $
” is next displayed.
6. Press the
[/–]
button so that the laser power meter
reads 6.9 to 7.1 mW, press the
p
(CD) button, and save the
adjustment results in the non-volatile memory. (“LD SAVE $
” is displayed momentarily.)
Note:
Do not emit 7.0 mW continuously for more than 15 seconds.
7. Press the
[/–]
button to display “LDPWR CHECK”.
8. Press the
p
(CD) button once to display “LD 0.9 mW $
”.
Check that the laser power meter reading is 0.85 to 0.91 mW.
9. Press the
p
(CD) button another time to diaplay “LD 7.0
mW $
”.
Check that the readings of the laser power meter and digital
voltmeter become the specified value.
Specified Value :
Laser power meter reading : 7.0 ± 0.1 mW
Digital voltmeter reading : Value displayed on optical pick-up la-
bel ± 10%
(Optical pick-up label)
10. Press the
^
(CD) button to display “LDPWR CHECK” and
stop the laser emission.
(The
^
(CD) button is effective at all times to stop the laser
emission.)
VC
A
B
Specified value : A = B
VC
A
B
Specified value : A = B
9. Press the
p
(CD) button to save the adjustment results in the
non-volatile memory (displayed as “EFB =
SAVE”
momentarliy).
Oscilloscope
TP69 (TEO)
TP1003 (VC)
BD (MD) board
V: 0.5 v/div H: 10 ms/div
Input: DC mode
Summary of Contents for HCD-MD1EX - System
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