Sony MDS-NT1 Service Manual page 32

MDS-NT1
[JOG UP] [JOG DOWN]
6. Click the or
the laser power meter becomes specified value, click the
[ENTER/YES]
to save it.
Specified Value:
Laser power meter reading: 8.2 to 8.6 mW (KMS-262A)
8.5 to 8.8 mW (KMS-262E)
Note: Do not perform the emission with 8.4 mW more than 15 seconds
continuously.
[JOG UP]
7. Then, click the
"LDPWR CHECK" (C13).
[ENTER/YES]
8. Click the once to display "L 0.90 mW $
Check that the reading of the laser power meter become speci-
fied value.
Specified Value:
Laser power meter reading: 0.84 to 0.92 mW (KMS-262A)
0.90 to 0.96 mW (KMS-262E)
[ENTER/YES]
9. Click the button once more to display "L 8.40
mW $ " (KMS-262A) or "L 8.65 mW $
Check that the reading the laser power meter and digital volt-
meter satisfy the specified value.
Note down the digital voltmeter reading value.
Specified Value:
Laser power meter reading : 8.4
8.65
Digital voltmeter reading : Value on the optical pick-up label
(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 ( )
[MENU/NO]
10. Click the to display "LDPWR CHECK" (C13)
and stop the laser emission.
[MENU/NO]
(The is effective at all times to stop the laser
emission.)
[JOG UP] [JOG DOWN]
11. Click the or
(C05).
[ENTER/YES]
12. Click the
Ref=@@@.@ (@ is an arbitrary number), click the
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 : Click the
To select the digit : Click the
[ENTER/YES]
14. When the
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 "L 0.70 mW $
Nothing needs to be performed here.
Adjustment Location: BD board (see page 35)
32
so that the reading of
[JOG DOWN]
or to display
" (KMS-262E).
0.3 mW (KMS-262A)
0.25 mW (KMS-262E)
10%
to display "Iop Write"
. When the display becomes
[ENTER/YES]
[JOG UP] [JOG DOWN]
or
[PUSH]
.
is clicked, "Complete!" will be dis-
[ENTER/YES]
is clicked, the display
" and "LD 7.50 mW $
5-12. 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 tempera-
ture.
Procedure:
[JOG UP]
1. Click the
(C06).
[ENTER/YES]
". 2. Click the
3. After the display changes to "Iop =xxsave?", click the
4. After "Complete!" is displayed momentarily, the display changes
to "Iop 8.4 mW".
5. After the display changes to "Iop=yysave?", click the
6. When "Complete!" is displayed, it means that Iop NV saving
has been completed.
5-13. 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 board
CN105 pin 4 (TE)
CN105 pin 6 (VC)
Connection:
BD 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 board.
2. Load a disc (any available on the market). (Refer to Note 1)
[STOP]
3. Click the
pick-up outside the pit.
[JOG UP]
4. Click the
ADJUST" (C07).
[ENTER/YES]
5. Click the
(Laser power READ power/Focus servo ON/tracking servo
.
OFF/spindle (S) servo ON)
[JOG UP]
6. Click the
of the oscilloscope becomes the specified value.
[JOG UP]
(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
[JOG DOWN]
or to display "Iop NV Save"
and display "Iop [stop]".
[ENTER/YES]
[ENTER/YES]
oscilloscope
(DC range)
330 k
+
–
10 pF
oscilloscope
(DC range)
+
V: 0.1 V/div
–
H: 10 ms/div
[FF]
after the clicked to move the optical
[JOG DOWN]
or to display "EF MO
to display "EFB = MO-R".
[JOG DOWN]
or so that the waveform
[JOG DOWN]
or is clicked, the
A
B
.
.
of