Sony ZS-M50 Service Manual page 22

5-6. LASER POWER ADJUSTMENT
Connections:
Laser power meter
Digital voltmeter
CN110 5 pin (I+3V)
CN110 4 pin (IOP)
[BD BOARD] (SIDE A)
Procedure:
1. Insert the laser power meter into the disk loading port and set
atop the objective lens of the optical pickup (if this cannot be
done successfully, shift the optical pickup using the 0 and
) buttons).
Connect the digital voltmeter to the CN110 5 pin (I+3V) and
CN110 4 pin (IOP).
2. Turn the AMS dial until " LDPWR ADJUST " is displayed.
(Laser power: adjustment purposes)
3. Press the YES/ENTER button once to display " LD 0.9mW $
".
4. Turn the AMS dial so that the laser power meter reading is be-
tween 0.86 – 0.92mW. After setting the range dial of the laser
power meter to 10mW, press the YES/ENTER button to save
the adjustment result to the non-volatile storage memory (at this
time, " LD SAVE $ " will be displayed for an instant).
5. Next, " LD 7.0mW $ " will be displayed.
6. Turn the AMS dial so that the laser power meter reading is be-
tween 6.9 – 7.1mW, then press the YES/ENTER button to save
the adjustment result (at this time, " LD SAVE $
displayed for an instant).
Do not emit the 7.0mW emission more than 15 seconds con-
Note:
tinuously.
7. Next, turn the AMS dial until " LDPWR CHECK " is displayed.
8. Press the YES/ENTER button once to display " LD 0.9mW $
".
At this time, check to see that the laser power meter reading is
between 0.85 – 0.91mW.
9. Next, press the YES/ENTER button once more to display " LD
7.0mW $ ".
At this time check to see that the laser power meter and digital
voltmeter reading comply with the specified values.
Optical pick-up
objective lens
" will be
Specified values:
Laser power meter reading : 6.9–7.1mW
Digital voltmeter reading : ±10% the value on the label of the opti-
cal pickup.
(Optical pick-up label)
KMS
In this case, Iop = 82.5mA
Iop(mA) = digital voltmeter reading (mV)/1(Ω)
10. Press the NO/CANCEL button to display " LDPWR CHECK "
and stop laser emission. (The NO/CANCEL button can be used
at anytime to stop laser emission)
5-7. TRAVERSE ADJUSTMENT
Connection:
Oscilloscope
CN110 3 pin (TEO)
VOLT/DIV : 0.5V
TIME/DIV : 10msec
Input: DC mode
[BD BOARD] (SIDE A)
Procedure:
1. Connect the oscilloscope to the CN110 3 pin (TEO) and CN110
2 pin (VC) of the BD board.
2. Insert a disk (any commercially available disk) that may be re-
corded on (see Note 1).
3. Press the 0 or ) button to shift the optical pick-up to the
outer edge of the pit.
4. Turn the AMS dial until " EFBAL ADJUST " is displayed.
5. Press the YES/ENTER button to display " EFB=
(The unit will be in the condition of: laser power READ power,
focus servo ON, tracking servo OFF and spindle (S) servo ON.)
6. Turn the AMS dial so that the waveform on the oscilloscope is
that of the specified value (turning the AMS dial will change
the numbers of " EFB=
this adjustment, the waveform changes for approximately ev-
ery 2%. Adjust the waveform closest to the specified value.
(read power traverse adjustment)
(Traverse waveform)
VC
Specification: A=B
– 22 –
260A
27X40
B0825
CN110 2 pin (VC)
" as well as the waveform). During
MO-R ".
A
B