Sony Walkman MZ-MH900, Service Manual

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20
MZ-NH900
Example of Calculation:
Item No. Parameter
Result
Decimal Hexadecimal
0211 Pr_nominal 2.50 mW 50 32h
0212 Kr
−
0.3 %/
°
C 30 1Eh
0213 Pw_nominal 7.35 mW 147 93h
0214 Kw
−
0.4 %/
°
C 40 28h
0215 Prmin 1.9 mW 38 26h
0216 Pwmin 5.8 mW 116 74h
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
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
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 Adjustment value
US 41
Canadian, Australian 21
AEP, UK, East European A1
E18, Hong Kong, Taiwan, Korean,
25
Chinese, Tourist
•
Abbreviation
E18: 100V - 240V AC area in E model
Table 3-7-2. Mode Type and Destination Setting
210
DiscPr
113
###S**
adjustment value (hexadecimal)
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
5. Press the
>
key three times to select the item number 9111
and display as follows.
Display
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. Calculating formula ( * 3)
0211 Pr_nominal / 0.05
(*1) Por / 0.05
0212 Kr
×
(
−
100)
0213 Pw_nominal / 0.05
(*2) Ppw / 0.05
0214 Kw
×
(
−
100)
0215 Prmin / 0.05
0216 Pwmin / 0.05
*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
9
DESIGN
111
###S**