Sony MINIDISC ZS-M35, Service Manual

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7. 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:
1. Press the
u
(MD) or
x
(MD) button to display “TEMP
ADJUST”.
2. Press the [RADIO/BAND] button to select the “TEMP ADJUST”
mode.
3. “TEMP = ” and the current temperature data will be displayed.
4. To save the data, press the
[RADIO/BAND]
button.
When not saving the data, press the [REC/REC MODE] button.
5. When the [RADIO/BAND] button is pressed, “TEMP = SAVE”
will be displayed and turned back to “TEMP ADJUST” display
then. When the
[REC/REC MODE] button is pressed, “TEMP
ADJUST” will be displayed immediately.
Specified Value:
The “TEMP =
” should be within “E0 - EF”, “F0 - FF”, “00 -
0F”, “10 - 1F” and “20 - 2F”.
8. LASER POWER ADJUSTMENT
Connection:
7. Then, press the u (MD) or x (MD) to display “LDPWR
CHECK”.
8. Press the
[RADIO/BAND]
button once to display “LD 0.9mW $
”. Check that the reading of the laser power meter become
0.85 to 0.91 mW.
9. Press the
[RADIO/BAND]
button once more to display “LD 7.0
mW $ ”. Check that the reading the laser power meter and
digital voltmeter satisfy the specified value.
Note down the digital voltmeter reading value.
Specified Value:
Laser power meter reading : 7.0 ± 0.2 mW
Digital voltmeter reading
: Value on the optical pick-up label
± 10%
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
.
but-
ton or
>
button to move the optical pick-up)
Connect the digital voltmeter to CN110 pin 5 (I+3 V) and
CN110 pin 4 (IOP) on the BD board.
2. Press the u (MD) or x (MD) button to display “LDPWR
ADJUST”.
(Laser power: For adjustment)
3. Press the [RADIO/BAND] button once to display “LD 0.9 mW $
”.
4. Press the
u
(MD) or
x
(MD) button so that the reading of
the laser power meter becomes 0.85 to 0.91 mW. Press the
[RADIO/BAND] button after setting the range knob of the laser
power meter, and save the adjustment results. (“LD SAVE $
” will be displayed for a moment)
5. Then “LD 7.0 mW $ ” will be displayed.
6. Press the
u
(MD) or
x
(MD) button and adjust so that the
reading on the laser power meter is 6.9 to 7.1 mV. Press the
[RADIO/BAND]
button to save the setting.
Note:
Do not perform the emission with 7.0 mW more than 15 seconds
continuously.
10. Press the [REC/REC MODE] button to display “LDPWR CHECK”
and stop the laser emission.
(The
[REC/REC MODE] button is effective at all times to stop
the laser emission)
Note 1: After step 9, each time the [RADIO/BAND] button is pressed, the
display will be switched “LD 0.7 mW $ ”, “LD 6.2 mW $ ”,
and “LD WP $ ”. Nothing needs to be performed here.
( = correction)
Optical pick-up
objective lens
laser
power meter
+
–
BD board
digital voltmeter
CN110 pin
5
(I +3V)
CN110 pin 4 (IOP)
KMS260B
27X40
B0825
lOP=82.5 mA in this case
lOP (mA) = Digital voltmeter reading (mV)/1 (
Ω
)
(Optical pick-up label)