Sony MDS-JB930 Service Manual page 26

7. INITIAL SETTING OF ADJUSTMENT VALUE
Note:
Mode which sets the adjustment results recorded in the non-volatile
memory to the initial setting value. However the results of the tempera-
ture compensation offset adjustment will not change to the initial setting
value.
If initial setting is performed, perform all adjustments again excluding the
temperature compensation offset adjustment.
For details of the initial setting, refer to "4. Precautions on Adjustments"
and execute the initial setting before the adjustment as required.
Setting Procedure :
[ AMS ]
±
1. Turn the ≠ knob to display "ADJ CLEAR" (C24).
[YES]
2. Press the button. "Complete!" will be displayed mo-
mentarily and initial setting will be executed, after which "ADJ
CLEAR" will be displayed.
8. RECORDING AND DISPLAYING THE IOP
INFORMATION
The IOP data can be recorded in the non-volatile memory. The
IOP value on the optical pick-up label 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 :
[ AMS ]
≠ ±
1. Turn the
[YES]
and press the button.
2. The display becomes Ref=@@@.@ (@ is an arbitrary num-
ber) and the numbers which can be changed will blink.
3. Input the IOP value on the optical pick-up label.
To select the number : Turn the
To select the digit : Press the
[YES]
4. When the button is pressed, the display becomes
"Measu=@@@.@" (@ is an arbitrary number).
5. As the adjustment results are recorded for the 6 value. Leave it
[YES]
as it is and press the
6. "Complete!" will be displayed momentarily. The value will be
recorded in the non-volatile memory and the display will be-
come "Iop Write".
Display Procedure :
[ AMS ]
1. Turn the ≠ ±
2. "@@.@/##.#" is displayed and the recorded contents are dis-
played.
@@.@ indicates the IOP value on the optical pick-up label.
##.# indicates the IOP value after adjustment
[ AMS ]
3. To end, press the ≠
to display "Iop Read".
26
knob to display "Iop Write" (C28),
[ AMS ]
≠ ± knob.
[ AMS ]
≠ ±
knob
button.
knob to display "Iop Read"(C27).
[MENU/NO]
± button or button
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 tem-
perature of this part has become the ambient temperature.
Adjusting Procedure :
[ AMS ]
1. Turn the ±
≠
(C09).
[YES]
2. Press the button to select the "TEMP ADJUS" mode.
3. "TEMP = [OK" and the current temperature data will be
displayed.
4. To save the data, press the
When not saving the data, press the
[YES]
5. When the button is pressed, "TEMP =
be displayed and turned back to "TEMP ADJUS" display then.
[MENU/NO]
When the button is pressed, "TEMP ADJUS" will
be displayed immediately.
Specified Value :
The "TEMP = " should be within "E0 - EF", "F0 - FF", "00 -
0F", "10 - 1F" and "20 - 2F".
10. LASER POWER ADJUSTMENT
Check the IOP value of the optical pick-up before adjustments.
(Refer to 8. Recording and Displaying IOP Information)
Connection :
Optical pick-up
objective lens
BD board
CN110 pin 5 (I +3V)
CN110 pin 4 (IOP)
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 0 button
[ ]
or ) button to move the optical pick-up)
Connect the digital voltmeter to CN110 pin 5 (I+3V) and
CN110 pin 4 (IOP) on the BD board.
[ AMS ]
±
2. Turn the ≠
(C10).
(Laser power : For adjustment)
[YES]
3. Press the button once to display "LD 0.9 mW $
[ AMS ]
4. Turn the ±
≠
ser power meter becomes 0.85 to 0.91 mW. Press the
button after setting the range knob of the laser power meter,
and save the adjustment results. ("LD SAVE $
played for a moment)
5. Then "LD 7.0 mW $ " will be displayed.
[ AMS ]
6. Turn the ≠ ±
ser power meter becomes 6.9 to 7.1 mW, press the
button to save it.
Note: Do not perform the emission with 7.0 mW more than 15 seconds
continuously.
knob to display "TEMP ADJUS"
[YES]
button.
[MENU/NO]
button.
SAVE" will
laser
power meter
digital voltmeter
+
–
[ ]
knob to display "LDPWR ADJUS"
knob so that the reading of the la-
[YES]
" will be dis-
knob so that the reading of the la-
[YES]
".