Sony MDS-S50 - Manual (Page 29)

29
MDS-S50
6. Turn the [ AMS ] knob so that the reading of the laser
power meter becomes 6.9 to 7.1 mW, press the [YES] button
to save it. (“LD SAVE $ ” will be displayed for a moment)
Note: Do not perform the emission with 7.0 mW more than 15 seconds
continuously.
7. Then, turn the [ AMS ] knob to display “LDPWR
CHECK” (C13).
8. Press the [YES] button once to display “LD 0.9mW$ ”.
Check that the reading of the laser power meter become 0.85
to 0.91 mW.
9. Press the [YES] button once more to display “LD 7.0mW$
”. 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%
10. Press the [MENU/NO] button to display “LDPWR CHECK”
(C13) and stop the laser emission.
(The
[MENU/NO] button is effective at all times to stop the
laser emission)
11. Turn the [ AMS ] knob to display “Iop Write” (C05).
12. Press the [YES] button. When the display becomes
Ref=@@@.@ (@ is an arbitrary number), press the [YES]
button to display “Measu=@@@.@” (@ is an arbitrary
number).
13. The numbers which can be changed will blink. Input the IOP
value noted down at step 9.
To select the number : Turn the
[ AMS ] knob.
To select the digit : Press the [ AMS ] knob.
14. When the [YES] button is pressed, “Complete!!” will be dis-
played momentarily. The value will be recorded in the non-
volatile memory and the display will become “Iop Write”
(C05).
Note: After step 9, each time the [YES] button is pressed, the display
will be switched “LD 0.7mW$ ”, “LD 6.2mW$ ”, and “LD
Wp $ ”. Nothing needs to be performed here.
Adjustment Location: BD board (see page 32)
5-11. Iop NV SAVE
Write the reference values in the nonvolatile memory to perform
“Iop compare”. As this involves rewriting the reference values, do
not perform this procedure except when adjusting the laser power
during replacement of the optical pick-up and when replacing the
IC102. Otherwise the optical pick-up check may deteriorate.
Note: Perform this function with the optical pick-up set at room
temperature.
Procedure:
1. Turn the
[ AMS ] knob to display “Iop NV Save” (C06).
2. Press the [YES] button and display “Iop [stop]”.
3. After the display changes to “Iop =xxsave?”, press the [YES]
button.
5-12. TRAVERSE ADJUSTMENT
Connection:
Procedure:
1. Connect an oscilloscope to CN105 pin 4 (TE) and CN105
pin 6 (VC) on the BD board.
2. Load a disc (any available on the market). (Refer to Note 1)
3. Press the
M button to move the optical pick-up outside the
pit.
4. Turn the [ AMS ] knob to display “EF MO ADJUST”
(C07).
5. Press the [YES] button to display “EFB = MO-R”.
(Laser power READ power/Focus servo ON/tracking servo
OFF/spindle (S) servo ON)
6. Turn the [ AMS ] knob so that the waveform of the
oscilloscope becomes the specified value.
(When the
[ AMS ] knob is turned, the of “EFB= ”
changes and the waveform changes) In this adjustment, wave-
form varies at intervals of approx. 2%. Adjust the waveform
so that the specified value is satisfied as much as possible.
(Read power traverse adjustment)
Traverse Waveform
7. Press the [YES] button and save the result of adjustment to the
non-volatile memory (“EFB = SAVE” will be displayed for
a moment. Then “EFB = MO-W” will be displayed).
Note 1: Data will be erased during MO reading if a recorded disc is
used in this adjustment.
Note 2: If the traverse waveform is not clear, connect the oscilloscope
as shown in the following figure so that it can be seen more
clearly.
KMS262B
20101
B0825
lOP=82.5 mA in this case
lOP (mA) = Digital voltmeter reading (mV)/1 (
Ω )
(Optical pick-up label)
For details of the method for
checking this value, refer to
“5-8. Recording and Displaying
the IOP Information”
+
–
oscilloscope
(DC range)
V: 0.1 V/div
H: 10 ms/div
BD board
CN105 pin 4 (TE)
CN105 pin 6 (VC)
A
B
VC
Specification A = B
4. After “Complete!” is displayed momentarily, the display changes
to “Iop 7.0mW”.
5. After the display changes to “Iop=yysave?”, press the [YES]
button.
6. When “Complete!” is displayed, it means that Iop NV saving
has been completed.
+
–
oscilloscope
(DC range)
10 pF
330 k
Ω
CN105 pin 4 (TE)
CN105 pin 6 (VC)
BD board
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