27
KMS
260B
20101
H0576
Iop = 57.6 mA in this case
Iop (mA) = Digital voltmeter reading (mV)/1 (
Ω
)
7. Then, rotate the AMS knob and display “LDPWR CHECK”.
8. Press the YES 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 YES 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 ± 0.2 mW
Digital voltmeter reading : Optical pick-up displayed value ± 10%
(Optical pick-up label)
10. Press the MENU/NO button and display “LDPWR CHECK”
and stop the laser emission.
(The MENU/NO button is effective at all times to stop the
laser emission.)
11. Rotate the AMS knob to display “Iop.Write”.
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 : Rotate the AMS knob.
To select the digit : Press the AMS knob
14. When the YES 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”.
Note 1:
After step 4, each time the YES button is pressed, the
display will be switched between “LD 0.7 mW $
”, “LD
6.2 mW $
”, and “LD Wp
$
”. Nothing needs
to be performed here.
(For details of the method for checking
this value, refer to “5-8. Recording and
Displaying IOP Information”.)
5-12. TRAVERSE ADJUSTMENT
Connection :
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
button and move the optical pick-up outside the
pit.
4. Rotate the AMS knob and display “EF MO ADJUST”.
5. Press the YES button and display “EFB =
MO-R”.
(Laser power READ power/Focus servo ON/tracking servo OFF/
spindle (S) servo ON)
6. Rotate the AMS knob so that the waveform of the oscilloscope
becomes the specified value.
(When the AMS knob is rotated, the
of “EFB=
” changes
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)
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).
8. Rotate the AMS knob so that the waveform of the oscilloscope
becomes the specified value.
(When the AMS knob is rotated, the
of “EFB-
MO-W”
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)
9. Press the YES button, and save the adjustment results in the
non-volatile memory. (“EFB =
SAVE” will be 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.
V : 0.5 V/div
H : 10 ms/div
Input : DC mode
Oscilloscope
BD board
CN105 pin
4
(TE)
CN105 pin
6
(VC)
VC
A
B
Specification A = B
VC
A
B
Specification A = B
R
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 OP and when replacing the IC102.
Otherwise the OP check may deteriorate.
Note:
Perform this function with the optical pick-up set at room
temperature.
Procedure
1. Rotate 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.
4. After “Complete!” is displayed momentarily, the display changes
to “Iop 7.0 mW”.
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.
Summary of Contents for MDS-JE440 - Md Player
Page 42: ...MDS JE440 42 42 6 10 SCHEMATIC DIAGRAM MAIN SECTION 3 3 See page 47 for IC Block Diagrams ...
Page 43: ...MDS JE440 43 43 6 11 PRINTED WIRING BOARD POWER SECTION ...
Page 44: ...MDS JE440 44 44 6 12 PRINTED WIRING BOARD DISPLAY SECTION ...
Page 45: ...MDS JE440 45 45 6 13 SCHEMATIC DIAGRAM DISPLAY SECTION See page 34 for Waveforms ...
