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MDS-JE770
7. Then, rotate the l AMS L knob and display “LDPWR
CHECK”(C13).
8. Press the YES button once and display “LD 0.9 mW $ ”.
Check that the reading of the laser power meter become the speci-
fied value.
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 : LD 0.9mW : 0.85-0.91mW (260B)
0.90-0.96mW (260E)
LD 7.0mW : 6.90-7.10mW (260B)
7.20-7.30mW (260E)
Digital voltmeter reading : Optical pick-up displayed value ± 10%
(Optical pick-up label)
10. Press the MENU/NO button and display “LDPWR CHECK”
(C13) and stop the laser emission.
(The MENU/NO button is effective at all times to stop the
laser emission.)
11. Rotate the l AMS L 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 : Rotate the l AMS L knob.
To select the digit : Press the l AMS L 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”(C05).
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.
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 l AMS L knob and display “EF MO
ADJUS”(C07).
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 l AMS L knob so that the waveform of the
oscilloscope becomes the specified value.
(When the l AMS L knob is rotated, the of “EFB=
” changes and the waveform changes.) In this adjustment,
waveform varies at intervals of approx. 2%. Adjust the wave-
form 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 l AMS L knob so that the waveform of the
oscilloscope becomes the specified value.
(When the l AMS L knob is rotated, the of “EFB-
MO-W” changes and the waveform changes.) In this adjustment,
waveform varies at intervals of approx. 2%. Adjust the wave-
form 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 mod
e
Oscilloscope
BD board
CN105 pin 4 (TE)
CN105 pin 6 (VC)
VC
A
B
Specification A = B
VC
A
B
Specification A = B
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 l AMS L 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.
KMS
260B
20101
H0576
Iop = 57.6 mA in this case
Iop (mA) = Digital voltmeter reading (mV)/1 (
Ω
)
(For details of the method for checking
this value, refer to “5-8. Recording and
Displaying IOP Information”.)
R