Initial Setting Of The Adjustment Value; Temperature Compensation Offset Adjustment; Laser Power Adjustment - Sony MDS-SP55 Service Manual

5-7. 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
temperature 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 "5-4. Precautions for Ad-
justments" and execute the initial setting before the adjustment as
required.
Setting Procedure :
1. Rotate the l L knob to display "MD ADJ CLEAR".
2. Press the ENTER/YES button. "Complete!!" will be displayed
momentarily and initial setting will be executed, after which "MD
ADJ CLEAR" will be displayed.
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. When the power OFF (STANDBY), press the ?/1 button (TA)
while pressing the s button and ENTER/YES button to-
gether.
2. Press the MENU/NO button, and when "Check" is displayed.
3. Rotate the l L knob to display "MD [Service]", and
press the ENTER/YES button.
4. Rotate the l L knob to display "MD Iop Write", and
press the ENTER/YES button.
5. The display becomes Ref=@@@.@ (@ is an arbitrary number)
and the numbers which can be changed will blink.
6. Input the IOP value written on the optical pick-up.
To select the number : Rotate the l L knob.
To select the digit : Press the SYNCHRO REC button.
7. When the ENTER/YES button is pressed, the display becomes
"MD Measu=@@@.@" (@ is an arbitrary number).
8. As the adjustment results are recorded for the 7 value. Leave it
as it is and press the ENTER/YES button.
9. "Complete!!" will be displayed momentarily. The value will be
recorded in the non-volatile memory and the display will be-
come "MD Iop Write".
Display Procedure :
1. Rotate the l L knob to display "MD Iop Read".
2. "MD @@.@/##.#" 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 L button or MENU/NO button to
display "MD Iop Read".
26
5-9. TEMPERATURE COMPENSATION OFFSET
ADJUTMENT
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 L knob and display "MD TEMP ADJUST".
2. Press the ENTER/YES button and select the "MD TEMP
ADJUST" mode.
3. "MD TEMP = [OK]" and the current temperature data will
be displayed.
4. To save the data, press the ENTER/YES button.
When not saving the data, press the MENU/NO button.
5. When the ENTER/YES button is pressed, "MD TEMP =
SAVE" will be displayed and turned back to "MD TEMP
ADJUST" display then. When the MENU/NO button is pressed,
"MD TEMP ADJUST" will be displayed immediatelly.
Specified Value :
The "MD 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 the 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 m button
or M button to move the optical pick-up.)
Connect the digital volt meter to CN110 pin 5 (I+3V) and
CN110 pin 4 (IOP).
2. Rotate the l L knob and display "MD LDPWR AD-
JUST".
(Laser power : For adjustment)
3. Press the ENTER/YES button once and display "MD LD 0.9
mW $ ".
4. Rotate the l L knob so that the reading of the laser
power meter becomes 0.85 to 0.91 mW. Press the ENTER/YES
button after setting the range knob of the laser power meter, and
save the adjustment results. ("MD LD SAVE $
played for a moment.)
Laser power
meter
Digital volt meter
" will be dis-