Sony HCD-VZ50MD Service Manual page 45

7. Then, move the multi-stick and display "LDPWR CHECK"
(C13).
8. Press the PUSH ENTER button once and display "LD 0.9 mW
$ ". Check that the reading of the laser power meter become
0.85 to 0.91 mW.
9. Press the PUSH ENTER button once more and display "LD
7.0 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 : 7.0 ± 0.1 mW
Digital voltmeter reading : Optical pick-up displayed value ± 10%
(Optical pick-up label)
(For details of the method for checking
KMS
260B
this value, refer to "6-8. Recording and
20101
Displaying the Iop Information".)
H0576
R
Iop = 57.6 mA in this case
Iop (mA) = Digital voltmeter reading (mV)/1 ( Ω )
10. Press the CLEAR button while REC IT is lit and display
"LDPWR CHECK" (C13) and stop the laser emission.
(The CLEAR button is effective at all times to stop the laser
emission.)
11. Move the multi-stick to display "Iop Write"(C05).
12. Press the PUSH ENTER button. When the display becomes
Ref=@@@.@ (@ is an arbitrary number), press the PUSH
ENTER button to display "Measu=@@@.@" (@ is an arbi-
trary number).
13. The numbers which can be changed will blink. Input the Iop
value noted down at step 9.
To select the number : Move the multi-stick.
To select the digit : Press the MD REC MODE button while
REC IT is lit.
14. When the PUSH ENTER button is pressed, "Complete!" will
be displayed momentarily. The value will be recorded in the non-
volatile memory and the display will become "Iop Write" (C05).
Note 1: After step 4, each time the PUSH ENTER button is
pressed, the display will be switched between "LD 0.7 mW
$ ", "LD 6.2 mW $
needs to be performed here.
6-11. 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. Move the multi-stick to display "Iop NV Save" (C06).
2. Press the PUSH ENTER button and display "Iop [stop]".
3. After the display changes to "Iop =xxsave?", press the PUSH
ENTER button.
4. After "Complete!" is displayed momentarily, the display changes
to "Iop 7.0 mW".
5. After the display changes to "Iop=yysave?", press the PUSH
ENTER button.
6. When "Complete!" is displayed, it means that Iop NV saving
has been completed.
", and "LD Wp $ ". Nothing
6-12. TRAVERSE ADJUSTMENT
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) of the BD board.
2. Load a test disc (MDW-74/GA-1). (Refer to Note 1.)
3. Press the m or M button while REC IT is off and move the
optical pick-up outside the pit.
4. Move the multi-stick and display "EF MO ADJUS" (C14).
5. Press the PUSH ENTER button and display "EFB =
(Laser power READ power/Focus servo ON/tracking servo OFF/
spindle (S) servo ON)
6. Move the multi-stick so that the waveform of the oscilloscope
becomes the specified value.
(When the Multi sitck is moved, the
and the waveform changes.) In this adjustment, waveform var-
ies 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
7. Press the PUSH ENTER button and save the result of adjust-
ment to the non-volatile memory ("EFB =
displayed for a moment. Then "EFB =
played).
8. Move the multi-stick so that the waveform of the oscilloscope
becomes the specified value.
(When the Multi stick is moved, the
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.
(Write power traverse adjustment)
(Traverse Waveform)
VC
Specification A = B
9. Press the PUSH ENTER button, and save the adjustment re-
sults in the non-volatile memory. ("EFB =
displayed for a moment.)
10. "EFB = MO-P". will be displayed.
The optical pick-up moves to the pit area automatically and servo
is imposed.
Oscilloscope
V : 0.5 V/div
H : 10 ms/div
Input : DC mode
MO-R".
of "EFB= " changes
A
B
SAVE" will be
MO-W" will be dis-
of "EFB- MO-W"
A
B
SAVE" will be
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