Sony DHC-MD333 / HCD-MD333 Service Manual ▷ View online
– 25 –
6-6. LASER POWER ADJUSTMENT
Connection :
KMS
260A
27X40
B0825
B0825
N
Iop = 82.5 mA in this case
Iop (mA) = Digital voltmeter reading (mV)/1 (
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
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 =
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)
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=
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)
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=
(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)
everytime when adjusted. Adjust as close as possible to the
specified value.
(Write Power Traverse Adjustment)
(Traverse Waveform)
Laser power
meter
meter
Optical pick-up
objective lens
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
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.
= 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 $
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 $
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 $
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.
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%
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.)
(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
– 26 –
10. Next “EFB =
MO-P” is displaed, the optical pick-up moves
to the internal circumference of the pit and servo is imposed.
11. Rotate the VOLUME knob so that the oscilloscope waveform
becomes the specified value.
The waveform changes by about 2% everytime when adjusted.
Adjust as close as possible to the specified value.
The waveform changes by about 2% everytime when adjusted.
Adjust as close as possible to the specified value.
(Traverse Waveform)
12. Press the p (CD) button and save the adjustment results in the
non-volatile memory (displayed as “EFB =
SAVE”
momentarliy).
“EFBAL: CD is next displayed and the disc stops rotating
automatically.
“EFBAL: CD is next displayed and the disc stops rotating
automatically.
13. Press the 6 (MD) button and remove the disc.
14. Load the check disc (MD) TDYS-1.
15. Press the p (CD) button to display “EFB =
14. Load the check disc (MD) TDYS-1.
15. Press the p (CD) button to display “EFB =
CD”. The servo
is imposed automatically.
16. Rotate the VOLUME knob so that the oscilloscope waveform
becomes the specified value.
The waveform changes by about 2% everytime when adjusted.
Adjust as close as possible to the specified value.
The waveform changes by about 2% everytime when adjusted.
Adjust as close as possible to the specified value.
(Traverse Waveform)
17. Press the p (CD) button and save the adjustment results in the
non-volatile memory after “EFB =
SAVE” is momentarliy
displayed.
“EFBAL ADJUST” is next displayed.
“EFBAL ADJUST” is next displayed.
18. Press the 6 (MD) button and remove the check disc (MD)
TDYS-1.
Note 1 : The data will be overwritten on the MO and erased when a
recorded disc is used in this adjustment.
Note 2 : If the traverse waveform is not clear, connect the oscillo-
scope as shown in the following figure so that it can be
seen more clearly.
seen more clearly.
VC
A
B
Specified value : A = B
VC
A
B
Specified value : A = B
330 k
Ω
Oscilloscope
10pF
BD (MD) board
TP (TEO)
TP (VC)
6-8. FOCUS BIAS ADJUSTMENT
Adjusting Procedure :
1. Load a continuously recorded disc (Refer to 6-4. Creating the
1. Load a continuously recorded disc (Refer to 6-4. Creating the
Continuously Recorded Disc”).
2. Rotate the VOLUME knob to display “CPLAY MODE”.
3. Press the p (CD) button to display “CPLAY MID”.
4. When “C1 =
3. Press the p (CD) button to display “CPLAY MID”.
4. When “C1 =
AD =
” is displayed, press the ^ (CD)
button.
5. Rotate the VOLUME knob to display “FBIAS ADJUST”.
6. Press the p (CD) button to display “
6. Press the p (CD) button to display “
/
a =
”.
The first four digits indicate the C1 error rate, the two digits
after the “/” indicate ADER and the two digits after “a =” indicate
the focus bias value.
after the “/” indicate ADER and the two digits after “a =” indicate
the focus bias value.
7. Rotate the VOLUME knob in the clockwise direction, and look
for the focus bias value at which the C1 error rate becomes
approximately approx. 200. (Refer to Note 2).
approximately approx. 200. (Refer to Note 2).
8. Press the p (CD) button to display “
/
b =
”.
9. Rotate the VOLUME knob in the counterclockwise direction,
and look for the focus bias value at which the C1 error rate
becomes approx. 200.
Check that the C1 error rate becomes almost equal to the value
set in step 7.
becomes approx. 200.
Check that the C1 error rate becomes almost equal to the value
set in step 7.
10. Press the p (CD) button to display “
/
c =
”.
11. Check that the C1 error rate is below 50 and that ADER is 00.
and press the p (CD) button.
12. If the value of “(
)” in the “
-
-
(
)” displayed is
above 20, press the p (CD) button.
If below, press the ^ (CD) button and start from step 2 again.
If below, press the ^ (CD) button and start from step 2 again.
13. Press the 6 button and remove the continuously recorded disc.
Note 1 : The following figure shows the relation between the C1
Note 1 : The following figure shows the relation between the C1
error and focus bias value. Look for points a and b in the
following figure by the adjustment avove. The focus
position (point c) is automatically calculated from points
a and b.
following figure by the adjustment avove. The focus
position (point c) is automatically calculated from points
a and b.
Note 2 : As the C1 error rate changes, use the average value in the
adjustment.
C1 error
approx.
200
200
b
c
a
Focus bias value
(F. BIAS)
(F. BIAS)
– 27 –
6-9. ERROR RATE CHECK
6-9-1. CD Error Rate Check
Checking Procedure :
1. Load a check disc (MD) TDYS-1.
2. Rotate the VOLUME knob to display “CPLAY MODE”.
3. Press the p (CD) button to display “CPLAY MID”.
4. “C1 =
1. Load a check disc (MD) TDYS-1.
2. Rotate the VOLUME knob to display “CPLAY MODE”.
3. Press the p (CD) button to display “CPLAY MID”.
4. “C1 =
AD =
” is displayed.
5. Check that the C1 error rate is below 20.
6. Press the ^ (CD) button to stop playback. Then press the
6. Press the ^ (CD) button to stop playback. Then press the
6 (MD) button, and remove the check disc (MD).
6-9-2. MO Error Rate Checking
Checking Procedure :
1. Load a continuously recorded disc (Refer to 6-4. Creating the
1. Load a continuously recorded disc (Refer to 6-4. Creating the
Continuously Recorded Disc”).
2. Rotate the VOLUME knob to display “CPLAY MODE”.
3. Press the p (CD) button to display “CPLAY MID”.
4. “C1 =
3. Press the p (CD) button to display “CPLAY MID”.
4. “C1 =
AD =
” is displayed.
5. Check that the C1 error rate is below 50 and ADER is 00.
6. Press the ^ (CD) button to stop playback. Then press the
6. Press the ^ (CD) button to stop playback. Then press the
6 (MD) button, and remove the disc.
6-10. FOCUS BIAS CHECK
Change the focus bias value and check the focus tolerance amount.
Checking Procedure :
1. Load a continuously recorded disc (Refer to 6-4. Creating the
1. Load a continuously recorded disc (Refer to 6-4. Creating the
Continuously Recorded Disc”).
2. Rotate the VOLUME knob to display “CPLAY MODE”.
3. Press the p (CD) button to display “CPLAY MID”.
4. When “C1 =
3. Press the p (CD) button to display “CPLAY MID”.
4. When “C1 =
AD =
” is displayed, press the ^ (CD)
button.
5. Rotate the VOLUME knob to display “FBIAS CHECK”.
6. Press the p (CD) button to display “
6. Press the p (CD) button to display “
/
c =
”.
The first four digits indicate the C1 error, the two digits after the
“/” indicate ADER and the two digits after “c =” indicate the
focus bias value.
Check that the C1 error is below 50 and ADER is 00.
“/” indicate ADER and the two digits after “c =” indicate the
focus bias value.
Check that the C1 error is below 50 and ADER is 00.
7. Press the p (CD) button to change the display to “
/
b =
”.
Check that the C1 error does not drop below 220 and ADER
does not remain above 00.
does not remain above 00.
8. Press the p (CD) button to change the display to “
/
a =
”.
Check that the C1 error does not drop below 220 and ADER
does not remain above 00.
does not remain above 00.
9. Press the ^ (CD) button, press the 6 (MD) button next, and
remove the continuously recorded disc.
Note 1 : If the C1 error is above 220 or ADER is above 00 only for
point a (step 8 above) and point b (step 7 above), the focus
bias may not adjusted properly. In this case, adjust again.
bias may not adjusted properly. In this case, adjust again.
– 28 –
6-11. ADJUSTING POINTS AND CONNECTING POINTS
[BD (MD) BOARD] (SIDE A)
D101
IC192
IC171
IC101
Q102
IC121
IC316
Q163
TP (IOP)
TP
(VC)
(VC)
TP
(TEO)
(TEO)
TP (I + 3V)
[BD (MD) BOARD] (SIDE B)
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