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5-8.
RECORDING AND DISPLAYING THE IOP INFORMATION
5-10. LASER POWER ADJUSTMENT
Check the IOP value of the optical pick-up before adjustments. (Refer to 8. Recording and Displaying IOP Information) Connection :
laser power meter
The IOP data can be recorded in the non-volatile memory. The IOP value on the optical pick-up label and the IOP value after the adjustment will be recorded. Recording these data eliminates the need to read the label on the optical pick-up. Recording Procedure : 1. Press the l m or M L button to display �Iop Write�, and press the ENTER/YES �R� button. 2. The display becomes Ref=@@@.@ (@ is an arbitrary number) and the numbers which can be changed will blink. 3. Input the IOP value on the optical pick-up label. To select the number : Press the l m or M L button. To select the digit : Press the [SYNC REC] button. 4. When the ENTER/YES �R� button is pressed, the display becomes �Measu=@@@.@� (@ is an arbitrary number). 5. As the adjustment results are recorded for the step 4 value. Leave it as it is and press the ENTER/YES �R� button. 6. �Complete!� will be displayed momentarily. The value will be recorded in the non-volatile memory and the display will become �Iop Write�. Display Procedure : 1. Press the l m or M L button to display �Iop Read�. 2. �@@.@/##.#� is displayed and the recorded contents are displayed. @@.@ indicates the IOP value on the optical pick-up label. ##.# indicates the IOP value after adjustment 3. To end, press the [CD-MD SYNC] button or MENU/NO �R� button to display �Iop Read�.
Optical pick-up objective lens
digital voltmeter BD (MD) board CN110 pin 5 (I+3V) CN110 pin 4 (IOP)
+ �
5-9.
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 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 Procedure : 1. Set the laser power meter on the objective lens of the optical pick-up. (When it cannot be set properly, press the l m or M L button to move the optical pick-up) Connect the digital voltmeter to CN110 pin 5 (I+3V) and CN110 pin 4 (IOP) on the BD (MD) board. 2. Press the l m or M L button to display �LDPWR ADJUST�. (Laser power : For adjustment) 3. Press the ENTER/YES �R� button once to display �LD 0.9 mW $ �. 4. Press the l m or M L button so that the reading of the laser power meter becomes 0.85 to 0.91 mW. Press the ENTER/YES �R� 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. Press the l m or M L button so that the reading of the laser power meter becomes 6.9 to 7.1 mW, press the ENTER/YES �R� button to save it.
Note: Do not perform the emission with 7.0 mW more than 15 seconds continuously. 7. Then, press the l m or M L button to display
�LDPWR CHECK�. 8. Press the ENTER/YES �R� 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 ENTER/YES �R� button once more to display �LD 7.0 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 : 7.0 ± 0.2 mW Digital voltmeter reading : Value on the optical pick-up label ±10%
(Optical pick-up label) KMS260A 27X40 B0825
Adjusting Procedure : 1. Press the l m or M L button to display �TEMP ADJUST�. 2. Press the ENTER/YES �R� button to select the �TEMP ADJUST� mode. 3. �TEMP = [OK]� and the current temperature data will be displayed. 4. To save the data, press the ENTER/YES �R� button. When not saving the data, press the MENU/NO �R� button. 5. When the ENTER/YES �R� button is pressed, �TEMP = SAVE� will be displayed and turned back to �TEMP ADJUST� display then. When the MENU/NO �R� button is pressed, �TEMP ADJUST� will be displayed immediately. Specified Value : The �TEMP = � should be within �E0 - EF�, �F0 - FF�, �00 0F�, �10 - 1F� and �20 - 2F�.
lOP=82.5 mA in this case lOP (mA) = Digital voltmeter reading (mV)/1 (�)
10. Press the MENU/NO �R� button to display �LDPWR CHECK� and stop the laser emission. (The MENU/NO �R� button is effective at all times to stop the laser emission.) 11. Press the l m or M L button to display �Iop Write�.
34
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