Sony MXD-D4 Service Manual page 39

[ AMS
6. Turn the
l L
the laser power meter becomes 8.2 to 8.6 mW, press the
button to save it.
Note: Do not perform the emission with 7.0 mW more than 15 seconds
continuously.
[ AMS
7. Then, turn the l
"LDPWR CHECK" (C13).
[YES]
8. Press the button once to display "LD 0.9 mW $
Check that the reading of the laser power meter become 0.85
to 0.91 mW.
[YES]
9. Press the button once more to display "LD 8.4 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 : 8.4 ± 0.3 mW
Digital voltmeter reading : Value on the optical pick-up label
±10%
(Optical pick-up label)
(For details of the method for
KMS
262A
checking this value, refer to "8.
20101
Recording and Displaying the Iop
B0825
Information".)
Iop = 82.5 mA in this case
Iop (mA) = Digital voltmeter reading (mV)/1 ( Ω )
[MENU/NO]
10. Press the button to display "LDPWR CHECK"
(C13) and stop the laser emission.
[MENU/NO]
(The button is effective at all times to stop the
laser emission.)
[ AMS
11. Turn the l L
(C05).
[YES]
12. Press the button. When the display becomes
Ref=@@@.@ (@ is an arbitrary number), press the
button to display "Measu=@@@.@" (@ is an arbitrary num-
ber).
13. The numbers which can be changed will blink. Input the Iop
value noted down at step 9.
To select the number : Turn the
To select the digit : Press the
[YES]
14. When the 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 4, each time the
will be switched "LD 0.7 mW $
Wp $ ". Nothing needs to be performed here.
Adjustment Location: BD (MD) board (see page 42)
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:
[ AMS
1. Rotate the
l L
Save" (C06).
[YES]
2. Press the button and display "Iop [stop]".
3. After the display changes to "Iop =xxsave?", press the
button.
]
(MD) knob so that the reading of
]
L (MD) knob to display
]
(MD) knob to display "Iop Write"
[ AMS ]
(MD) knob.
l L
[ AMS ]
(MD) knob.
l L
[YES]
button is pressed, the display
", "LD 7.5 mW $ ", and "LD
]
(MD) knob to display "Iop NV
4. After "Complete!" is displayed momentarily, the display changes
[YES]
to "Iop 7.0 mW".
5. After the display changes to "Iop=yysave?", press the
button.
6. When "Complete!" is displayed, it means that Iop NV saving
has been completed.
".
12. TRAVERSE ADJUSTMENT
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.
BD (MD) board
CN105 pin 4 (TE)
CN105 pin 6 (VC)
Connection:
BD (MD) board
CN105 pin 4 (TE)
CN105 pin 6 (VC)
Adjusting Procedure:
1. Connect an oscilloscope to CN105 pin 4 (TE) and CN105
pin 6 (VC) on the BD (MD) board.
2. Load a disc (any available on the market). (Refer to Note 1)
3. Press the M
side the pit.
[YES]
[
4. Turn the l
ADJUST" (C07).
[YES]
5. Press the
(Laser power READ power/Focus servo ON/tracking servo
OFF/spindle (S) servo ON)
[
6. Turn the l
of the oscilloscope becomes the specified value.
[
(When the
"EFB= " changes and the waveform changes.) In this ad-
justment, waveform 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
VC
Specification A = B
[YES]
7. Press the
non-volatile memory ("EFB =
a moment. Then "EFB =
[YES]
oscilloscope
330 k Ω
10 pF
oscilloscope
(DC range)
+
–
(MD) button to move the optical pick-up out-
AMS ]
L (MD) knob to display "EF MO
button to display "EFB =
AMS ]
L (MD) knob so that the waveform
AMS ]
l L (MD) knob is turned, the
button and save the result of adjustment to the
SAVE" will be displayed for
MO-W" will be displayed).
[YES]
(DC range)
+
–
V: 0.1 V/div
H: 10 ms/div
MO-R".
of
A
B
39