Temperature Compensation Offset Adjustment; Laser Power Adjustment - Sony HCD-EX770 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. Turning the SELECTOR knob and display "TEMP AD-
JUST".
2. Press the ENTER/YES button and select the "TEMP AD-
JUST" mode.
3. "TEMP = " and the current temperature a data will be dis-
played.
4. To save the data, press the ENTER/YES button.
When not saving the data, press the EDIT/NO button.
5. When the ENTER/YES button is pressed, "TEMP=
SAVE" will be displayed for some time, followed by "TEMP
ADJUST".
When the EDIT/NO 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
objective lens
BD board
CN110 pin 5 (I+3 V)
CN110 pin 4 (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 CN110 pin 5 (I+3 V) and
CN110 pin 4 (IOP) of the BD board.
2. Turning the SELECTOR knob and display "LDPWR AD-
JUST".
(Laser power: for adjustment)
3. Press the ENTER/YES button and display "LD 0.9 mW $
4. Turning the SELECTOR knob so that the reading of the la-
ser power meter becomes 0.82 to 0.91 mW.
Set the range control on the laser power meter to 10 mW, then
press the ENTER/YES button to save the adjustment result
in the non- volatile memory.
("LD SAVE $ " will be displayed for a moment.)
5. Then "LD 7.0 mW $
6. Turning the SELECTOR knob so that the reading of
the laser power meter becomes 6.9 to 7.1 mW, press the
ENTER/YES button and save the adjustment result in the non-
volatile memory.
("LD SAVE $ " will be displayed for a moment.)
Note: Do not perform the emission with 7.0 mW more than 15
seconds continuously.
7. Turning the SELECTOR knob and display "LDPWR
CHECK".
8. Press the ENTER/YES 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 ENTER/YES button and display "LD 7.0 mW $
Check that the reading of the laser power meter and digital
voltmeter satisfy the specified value.
Specification:
Laser power meter reading : 7.0 ± 0.2 mW
Digital voltmeter reading
(Optical pick-up label)
KMS260A
27X40
B0825
lOP=82.5 mA in this case
lOP (mA) = Digital voltmeter reading (mV)/1 ( Ω )
10. Press the EDIT/NO button and display "LDPWR CHECK",
and stop the laser emission.
(The EDIT/NO button is effective at all times to stop the la-
ser emission.)
– 28 –
laser
power meter
digital voltmeter
+
–
"will be displayed.
: Optical pick-up displayed value ±10%
".
".
".