29
MDS-JB980
5-8. RECORDING AND DISPLAYING THE Iop
INFORMATION
The Iop data can be recorded in the non-volatile memory. The Iop
value on the label of the optical pick-up and the Iop value after the
adjustment will be recorded. Recording these data eliminates the
need to read the label on the optical pick-up.
Recording Procedure :
1. While pressing the
l
AMS
L
knob and
x
button, con-
nect the power plug to the outlet, and release the
l
AMS
L
knob and
x
button.
2. Rotate the
l
AMS
L
knob to display “[Service]”, and
press the YES button.
3. Rotate the
l
AMS
L
knob to display “Iop Write” (C05),
and press the YES button.
4. The display becomes Ref=@@@.@ (@ is an arbitrary number)
and the numbers which can be changed will blink.
5. Input the Iop value written on the optical pick-up.
To select the number : Rotate the
l
AMS
L
knob.
To select the digit : Press the
l
AMS
L
knob
6. When the YES button is pressed, the display becomes
“Measu=@@@.@” (@ is an arbitrary number).
7. As the adjustment results are recorded for the 6 value. Leave it
as it is and press the YES button.
8. “Complete!” will be displayed momentarily. The value will be
recorded in the non-volatile memory and the display will be-
come “Iop Write” (C05).
Display Procedure :
1. Rotate the
l
AMS
L
knob to display “Iop Read” (C26).
2. “@@.@/##.#” is displayed and the recorded contents are
displayed.
@@.@ indicates the Iop value labeled on the pick-up.
##.# indicates the Iop value after adjustment
3. To end, press the
l
AMS
L
button or MENU/NO
button to display “Iop Read” (C26).
5-9. TEMPERATURE COMPENSATION OFFSET
ADJUSTMENT
Save the temperature data at that time in the non-volatile memory
as 25 ˚C reference data.
Note :
1. Usually, do not perform this adjustment.
2. Perform this adjustment in an ambient temperature of 22 ˚C to
28 ˚C. Perform it immediately after the power is turned on when
the internal temperature of the unit is the same as the ambient
temperature of 22 ˚C to 28 ˚C.
3. When D101 has been replaced, perform this adjustment after
the temperature of this part has become the ambient tempera-
ture.
Adjusting Procedure :
1. Rotate the
l
AMS
L
knob and display “TEMP ADJUS”
(C03).
2. Press the YES button.
3. “TEMP =
[OK]” and the current temperature data will be
displayed.
4. To save the data, press the YES button.
When not saving the data, press the MENU/NO button.
5. When the YES button is pressed, “TEMP =
SAVE” will be
displayed and turned back to “TEMP ADJUS” (C03) display
then. When the MENU/NO button is pressed, “TEMP ADJUS”
(C03) will be displayed immediatelly.
Specified Value :
The “TEMP =
” should be within “E0 - EF”, “F0 - FF”, “00 -
0F”, “10 - 1F” and “20 - 2F”.
5-10. LASER POWER ADJUSTMENT
Check the Iop value of the optical pick-up before adjustments.
(Refer to 5-8. Recording and Displaying Iop Information.)
Connection :
Adjusting Procedure :
1. Set the laser power meter on the objective lens of the optical
pick-up. (When it cannot be set properly, press the
m
button
or
M
button to move the optical pick-up.)
Connect the digital volt meter to CN105 pin
1
(I+3V) and
CN105 pin
2
(Iop).
2. Rotate the
l
AMS
L
knob and display “LDPWR
ADJUS” (C04).
(Laser power : For adjustment)
3. Press the YES button once and display “L 0.93 mW $
”.
4. Rotate the
l
AMS
L
knob so that the reading of the laser
power meter becomes the specified value. Press the YES
button after setting the range knob of the laser power meter, and
save the adjustment results. (“L SAVE $
” will be displayed
for a moment.)
5. Then “L 7.25 mW $
” will be displayed.
6. Rotate the
l
AMS
L
knob so that the reading of the
laser power meter becomes the specified value, press the
YES button and save it.
Note : Do not perform the emission with 7.25 mW more than 15
seconds continuously.
7. Then, rotate the
l
AMS
L
knob and display “LDPWR
CHECK” (C13).
8. Press the YES button once and display “L 0.93 mW $
”.
Check that the reading of the laser power meter become the speci-
fied value.
9. Press the YES button once more and display “L 7.25 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 : L 0.93mW : 0.85-0.91mW (260B)
0.90-0.96mW (260E)
L 7.25mW : 6.90-7.10mW (260B)
7.20-7.30mW (260E)
Digital voltmeter reading : Optical pick-up displayed value ± 10%
(Optical pick-up label)
Laser power
meter
Optical pick-up
objective lens
Digital volt meter
BD board
CN105 pin
1
(I+3V)
CN105 pin
2
(Iop)
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
