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4-6. Laser Power Adjustment
Connection :
laser power meter
Optical pickup
objective lens
+
–
digital voltmeter
BD (MD) board
TP (I+5V)
TP (IOP)
Adjusting Method :
1. Set the laser power meter on the objective lens of the optical pickup.
(When it cannot be set properly, press the
0
button or
)
but-
ton and move the optical pickup.)
Connect the digital volt meter to TP (IOP) and TP (I+5V).
2. Rotate the JOG dial and display “LDPWR ADJUST”.
(Laser power : For adjustment)
3. Press the YES button twice and display “LD $ 4B = 3.5mW”.
4. Adjust RV102 of the BD (MD) board so that the reading of the
+0.1
laser power meter becomes 3.4
- 0
mW.
5. Press the YES button and display “LD $ 96 = 7.0mW”.
(Laser power : MO writing)
6. Check that the laser power meter and digital voltmeter readings
satisfy the specified value.
Specification :
KMS210A
27X40
B0825
IOP = 82.5mA in this case
IOP (mA) = Digital voltmeter reading (mV) / 1(
Ω
)
Laser power meter reading : 7.0
±
0.3 mW
Digital voltmeter reading
: Optical pickup displayed value
±
10%
(Optical pickup label)
7. Press the YES button and display “LD $ 0F = 0.7mW”.
(Laser power : MO reading)
8. Check that the laser power meter at this time satisfies the speci-
fied value.
Specification :
Laser power meter reading : 0.70 ± 0.1mW
9. Press the NO button and display “LDPWR ADJUST”, and stop
laser emission.
(The NO button is effective at all times to stop the laser emis-
sion.)
6-5. Temperature Compensation Offset Adjustment
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
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 JOG dial 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 NO button.
5. When the YES button is pressed, “TEMP = SAVE”will be
displayed for some time, followed by “TEMP ADJUST”.
When the NO button is pressed, “TEMP ADJUST” will be dis-
played.
Specifications :
The temperature should be within “TEMP = EO” to “TEMP = IF”.
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