Sony HCD-MD333 - Hi Fi Cd/minidisc Component, Руководство по обслуживанию

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6-6. LASER POWER ADJUSTMENT
Connection :
KMS 260A
27X40
B0825
N
Iop = 82.5 mA in this case
Iop (mA) = Digital voltmeter reading (mV)/1 (
Ω
)
6-7. TRAVERSE ADJUSTMENT
Connection :
Adjusting Procedure:
1. Connect an oscilloscope to TP (TEO) and TP (VC) of CN110 of
the BD (MD) board.
2. Load a recordable disc (any available on the market). (Refer to
Note 1.)
3. Press the
= 0
or
) +
button to move the optical
pick-up outside the pit.
4. Rotate the VOLUME knob to display “EFBAL ADJUST”.
5. Press the
p
(CD) button to display “EFB = MO-R”.
(Laser power READ power/Focus servo ON/tracking servo OFF/
spindle (S) servo ON)
6. Rotate the VOLUME knob so that the oscilloscope waveform
becomes the specified value. (Rotating the VOLUME knob
changes the “EFB=
” value and the waveform.) The waveform
changes by about 2% everytime when adjusted. Adjust as close
as possible to the specified value.
(Read power traverse adjustment)
(Traverse Waveform)
7. Press the
p
(CD) button and save the adjustment results in the
non-volatile memory (displayed as “EFB = SAVE”
momentarliy and then displayed as “EFB = MO-W”).
8. Rotate the VOLUME knob so that the oscilloscope waveform
becomes the specified value.
(Rotating the VOLUME knob changes the “EFB=
” value
and the waveform.) The waveform changes by about 2%
everytime when adjusted. Adjust as close as possible to the
specified value.
(Write Power Traverse Adjustment)
(Traverse Waveform)
Laser power
meter
Optical pick-up
objective lens
Digital volt meter
TP (I+3V)
TP (IOP)
BD (MD) board
Adjusting Procedure:
1. Set the laser power meter on the objective lens of the optical
pick-up from the disc slot. (If it cannot be set properly, press the
= 0
or
) +
button to move the optical pick-up).
Connect the digital voltmeter to TP (I+3V) and TP (IOP) of the
BD (MD) board.
2. Rotate the VOLUME knob to display “LDPWR ADJUST”.
(Laser power: For adjustment)
3. Press the
p
(CD) button once to display “LD 0.9 mW $ ”.
4. Rotate the VOLUME knob so that the laser power meter reads
0.86 to 0.92 mW. Set the range knob of the laser power meter to
10 mW, press the
p
(CD) button, and save the adjustment results
in the non-volatile memory. (“LD SAVE $ ” is displayed
momentarily.)
5. “LD 7.0 mW $ ” is next displayed.
6. Rotate the VOLUME knob so that the laser power meter reads
6.9 to 7.1 mW, press the
p
(CD) button, and save the adjustment
results in the non-volatile memory. (“LD SAVE $ ” is displayed
momentarily.)
Note: Do not emit 7.0 mW continuously for more than 15 seconds.
7. Rotate the VOLUME knob to display “LDPWR CHECK”.
8. Press the
p
(CD) button once to display “LD 0.9 mW $ ”.
Check that the laser power meter reading is 0.85 to 0.91 mW.
9. Press the
p
(CD) button another time to diaplay “LD 7.0 mW
$ ”.
Check that the readings of the laser power meter and digital
voltmeter become the specified value.
Specified Value :
Laser power meter reading : 7.0 ± 0.1 mW
Digital voltmeter reading : Value displayed on optical pick-up label
± 10%
(Optical pick-up label)
10. Press the
^
(CD) button to display “LDPWR CHECK” and
stop the laser emission.
(The
^
(CD) button is effective at all times to stop the laser
emission.)
VC
A
B
Specified value : A = B
VC
A
B
Specified value : A = B
9. Press the
p
(CD) button to save the adjustment results in the
non-volatile memory (displayed as “EFB = SAVE”
momentarliy).
Oscilloscope
TP (TEO)
TP (VC)
BD (MD) board