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5-5. TEMPERATURE COMPENSATION OFFSET
ADJUTMENT
Save the temperature data at that time in the non-volatile memory
as 25 ˚C reference data.
Note :
1. Usually, do not perform this adjustment.
2. Perform this adjustment in an ambient temperature of 22 ˚C
to 28 ˚C. Perform it immediately after the power is turned on
when the internal temperature of the unit is the same as the
ambient temperature of 22 ˚C to 28 ˚C.
3. When D101 has been replaced, perform this adjustment after
the temperature of this part has become the ambient
temperature.
Adjusting Method :
1. Rotate the AMS knob and display “TEMP ADJUST”.
2. Press the YES button and select the “TEMP ADJUST” mode.
3. “TEMP = ” and the current temperature data will be
displayed.
4. To save the data, press the YES button.
When not saving the data, press the EDIT/NO button.
5. When the YES button is pressed, “TEMP = SAVE” will be
displayed and turned back to “TEMP ADJUST” display then.
When the EDIT/NO button is pressed, “TEMP ADJUST” will
be displayed immediatelly.
Specified Value :
The “TEMP = ” should be within “E0 - EF”, “F0 - FF”, “00 -
0F”, “10 - 1F” and “20 - 2F”.
5-6. LASER POWER ADJUSTMENT
Connection :
Laser power
meter
Optical pick-up
objective lens
Digital volt meter
BD board
CN110 pin
5
(I+3V)
CN110 pin
4
(IOP)
Adjusting Method :
1. Set the laser power meter on the objective lens of the optical
pick-up. (When it cannot be set properly, press the 0 button
or ) button to move the optical pick-up.)
Connect the digital volt meter to CN110 pin 5 (I+3V) and
CN110 pin 4 (IOP).
2. Rotate the AMS knob and display “LDPWR ADJUST”.
(Laser power : For adjustment)
3. Press the YES button once and display “LD 0.9 mW $ ”.
4. Rotate the AMS knob so that the reading of the laser power
meter becomes 0.86 to 0.92 mW. Press the YES button after
setting the range knob of the laser power meter, and save the
adjustment results. (“LD SAVE $ ” will be displayed for a
moment.)
5. Then “LD 7.0 mW $ ” will be displayed.
6. Rotate the AMS knob so that the reading of the laser power
meter becomes 6.9 to 7.1 mW, press the YES button and save
it.
Note : Do not perform the emission with 7.0 mW more than 15
seconds continuously.
7. Then, rotate the AMS knob and display “LDPWR CHECK”.
8. Press the YES button once and 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 and display “LD 7.0 mW $
”. Check that the reading the laser power meter and digital
volt meter satisfy the specified value.
Specified Value :
Laser power meter reading : 7.0 ± 0.1 mW
Digital voltmeter reading : Optical pick-up displayed value ± 10%
KMS
260A
27X40
B0825
N
Iop = 82.5 mA in this case
Iop (mA) = Digital voltmeter reading (mV)/1 (
Ω
)
(Optical pick-up label)
10. Press the EDIT/NO button and display “LDPWR CHECK” and
stop the laser emission.
(The EDIT/NO button is effective at all times to stop the laser
emission.)