SONY MZNH900
Service Manual

MZ-NH900

3-6. Laser Power Check Procedure: 1. In the test mode (Display Check mode), press the [VOL+] key to enter the Manual mode. 2. Open the lid and press the . key continuously until the optical pick-up moves to the most inward track. 3. Set the laser power meter so that the laser beam from the optical pick-up aims at the objective lens of laser power meter at right angle. 4. Press the [VOL--] key once to display as follows.
Display

Example of Calculation:
Result Item No. 0211 0212 0213 0214 0215 0216 Parameter Pr_nominal 2.50 mW Decimal 50 30 147 40 38 116 Hexadecimal 32h 1Eh 93h 28h 26h 74h

Kr �0.3 %/°C Pw_nominal 7.35 mW Kw �0.4 %/°C Prmin 1.9 mW Pwmin 5.8 mW

9 DESIGN

Procedure: 1. In the test mode (Display Check mode), press the [VOL+] key to enter the Manual mode. 2. Press the > key once, press the [VOL+] key once, and press the > key once again to display as follows.
Display

5. Press the > key three times to select the item number 9111 and display as follows.
Display

210 DiscPr

111 ###S**

6. Confirm that the value of laser power meter is 0.67 mW ± 21%. 7. Press the > key to select the item number 9112. 8. Confirm that the value of laser power meter is 0.76 mW ± 18%. 9. Press the > key to select the item number 9113. 10. Confirm that the value of laser power meter is 6.25 mW ± 12%. 11. Press the x key four times and back to the Display Check mode. 3-7. Setting The Adjustment Values 3-7-1. Hi-MD3 setting Preparation: 1. Perform calculation every item based on the data given by the Hi-MD3 adjustment disc by referring to the following table. (Round off the value in decimal place) 2. Convert the calculated value into hexadecimal number.
Note: The Hi-MD3 adjustment parameters vary depending on the disc, and therefore use the parameters of the disc used when performing the adjustment. Item No. 0211 (*1) 0212 0213 (*2) 0214 0215 0216 Calculating formula (*3) Pr_nominal / 0.05 Por / 0.05 Kr � (�100) Pw_nominal / 0.05 Ppw / 0.05 Kw � (�100) Prmin / 0.05 Pwmin / 0.05

3. Press the > key once to select the item number 0211. 4. Adjust with [VOL+]/[VOL--] keys so that the adjustment value of LCD becomes calculated value. 5. Press the X key to write the adjusted value. 6. Press the > key to next item. 7. Repeat adjustment from step 4 until item number 0216. 3-7-2. Other setting 1. In the test mode (Display Check mode), press the [VOL+] key to enter the Manual mode. 2. Press the > key five time to select the item number 0113 and display as follows.
Display

113 ###S**
adjustment value (hexadecimal)

3. Press the [VOL+]/[VOL--] key and set the according value to each model type and destination referring to the following table. 4. Press the X key to write the adjusted value.
Destination US Canadian, Australian AEP, UK, East European E18, Hong Kong, Taiwan, Korean, Chinese, Tourist Adjustment value 41 21 A1 25

� Abbreviation E18: 100V - 240V AC area in E model Table 3-7-2. Mode Type and Destination Setting

*1) If the �Pr_nominal� value is indicated, use the �Pr_nominal� value and not used �Por� value. *2) If the �Pw_nominal� value is indicated, use the �Pw_nominal� value and not used �Ppw� value. *3) Round off after the decimal point.

Table 3-7-1. Hi-MD3 adjustment parameter

20