35
6. Turn the [ AMS ] (MD) knob so that the reading of
the laser power meter becomes 6.9 to 7.1 mW, press the [YES]
button to save it.
Note: Do not perform the emission with 7.0 mW more than 15 seconds
continuously.
7. Then, turn the [ AMS ] (MD) knob to display
“LDPWR CHECK” (C02).
8. Press the [YES] button once to display “LD 0.9 mW $ ”.
Check that the reading of the laser power meter become 0.85
to 0.91 mW.
9. Press the [YES] button once more to display “LD 8.4 mW $
”. Check that the reading the laser power meter and digital
voltmeter satisfy the specified value.
Note down the digital voltmeter reading value.
Specified Value:
Laser power meter reading: 8.4 ± 0.2 mW
Digital voltmeter reading : Value on the optical pick-up label
±10%
10. Press the
[MENU/NO] button to display “LDPWR CHECK”
and stop the laser emission.
(The [MENU/NO] button is effective at all times to stop the
laser emission.)
11. Turn the [ AMS ] (MD) knob to display “Iop Write”
(C28).
12. Press the
[YES] button. When the display becomes
Ref=@@@.@ (@ is an arbitrary number), press the [YES]
button to display “Measu=@@@.@” (@ is an arbitrary num-
ber).
13. The numbers which can be changed will blink. Input the Iop
value noted down at step 9.
To select the number : Turn the [ AMS ] (MD) knob.
To select the digit : Press the [ AMS ] (MD) knob.
14. When the [YES] button is pressed, “Complete!” will be dis-
played momentarily. The value will be recorded in the non-
volatile memory and the display will become “Iop Write”.
Note 1: After step 4, each time the [YES] button is pressed, the display
will be switched “LD 0.7 mW $ ”, “LD 7.5 mW $ ”, and
“LD Wp $ ”. Nothing needs to be performed here.
KMS262A
27X40
B0825
lOP=82.5 mA in this case
lOP (mA) = Digital voltmeter reading (mV)/1 (
Ω
)
(Optical pick-up label)
lL
lL
lL
lL
lL
11. TRAVERSE ADJUSTMENT
Connection :
Adjusting Procedure :
1. Connect an oscilloscope to CN110 pin 3 (TEO) and CN110
pin 1 (VC) on the BD (MD) board.
2. Load a disc (any available on the market). (Refer to Note 1)
3. Press the M (MD) button to move the optical pick-up out-
side the pit.
4. Turn the [ AMS ] (MD) knob to display “EF MO
ADJUS” (C10).
5. Press the [YES] button to display “EFB = MO-R”.
(Laser power READ power/Focus servo ON/tracking servo
OFF/spindle (S) servo ON)
6. Turn the
[ AMS ] (MD) knob so that the waveform
of the oscilloscope becomes the specified value.
(When the [ AMS ] (MD) knob is turned, the of
“EFB= ” changes and the waveform changes.) In this ad-
justment, waveform 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
7. Press the [YES] button and save the result of adjustment to the
non-volatile memory (“EFB = SAV” will be displayed for
a moment. Then “EFB = MO-W” will be displayed).
Note 1:Data will be erased during MO reading if a recorded disc is
used in this adjustment.
Note 2:If the traverse waveform is not clear, connect the oscilloscope
as shown in the following figure so that it can be seen more
clearly.
+
–
oscilloscope
(DC range)
10 pF
330 k
Ω
CN110 pin
3
(TEO)
CN110 pin
1
(VC)
BD (MD) board
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