Temperature Compensation Offset Adjustment; Laser Power Adjustment - Sony HCD-MD313 Service Manual

5-5. TEMPERATURE COMPENSATION OFFSET
ADJUSTMENT
Save the temperature data at that time in the non-volatile memory
as 25 °C reference data.
Notes:
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 Method:
1. Turn the VOLUME knob and display "TEMP ADJUST".
2. Press the p (CD) button to change the display to "TEMP =
" (The numbers " " displayed shows you the current tem-
perature.)
3. To save the data, press the p (CD) button.
When not saving the data, press the ^ (CD) button.
4. When the p (CD) button is pressed, "TEMP=
be displayed for some time, followed by "TEMP ADJUST".
When the ^ (CD) button is pressed, "TEMP ADJUST" will
be displayed immediately.
Specifications:
The temperature should be within "E0-EF", "F0-FF", "00-0F",
"10-1F" and "20-2F".

5-6. LASER POWER ADJUSTMENT

Connection:
Optical pick-up
TP1004 (I+3 V)
TP1005 (IOP)
Adjusting Method:
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 and move the optical
pick-up.)
Connect the digital voltmeter to TP1004 (I+3 V) and TP1005
(IOP) of the BD board.
SAVE" will
2. Turn the VOLUME knob and display "LDPWR ADJUST".
(Laser power: for adjustment)
3. Press the p (CD) button and display "LD 0.9 mW $
4. Turn the VOLUME knob so that the reading of the laser power
meter becomes 0.82 to 0.91 mW.
Set the range control on the laser power meter to 10 mW, then
press the p (CD) button to save the adjustment result in the
non- volatile memory.
("LD SAVE $
5. Then "LD 7.0 mW $
6. Turn the VOLUME knob so that the reading of the laser power
meter becomes 6.9 to 7.1 mW, press the p (CD) button and
save the adjustment result in the nonvolatile memory.
("LD SAVE $
Note: Do not perform the emission with 7.0 mW more than 15 seconds
continuously.
7. Turn the VOLUME knob and display "LDPWR CHECK".
8. Press the p (CD) button and display "LD 0.9 mW $
Check that the reading of the laser power meter becomes 0.80
to 0.96 mW.
9. Press the p (CD) button and display "LD 7.0 mW $
Check that the reading of the laser power meter and digital volt-
meter satisfy the specified value.
Specification:
Laser power meter reading : 7.0 ± 0.2 mW
Digital voltmeter reading : Optical pick-up displayed value ±10%
(Optical pick-up label)
lOP=56.7 mA in this case
lOP (mA) = Digital voltmeter reading (mV)/1 ( Ω )
10. Press the ^ (CD) button and display "LDPWR CHECK",
and stop the laser emission.
(The ^ (CD) button is effective at all times to stop the laser
emission.)
– 20 –
laser
power meter
objective lens
digital voltmeter
BD board
+
–
" will be displayed for a moment.)
"will be displayed.
" will be displayed for a moment.)
KMS260A
27X40
B0567
".
".
".