Sony MDS-JA50ES Service Manual ▷ View online
— 33 —
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
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.
the internal temperature of the unit is the same as the ambient
temperature.
3. When D101 has been replaced, perform this adjustment after
the temperature of this part has become the ambient tempera-
ture.
ture.
Adjusting Method :
1. Rotate the AMS knob and display “TEMP ADJUS”.
2. Press the YES button and select the “TEMP ADJUS” mode.
3. “TEMP =
1. Rotate the AMS knob and display “TEMP ADJUS”.
2. Press the YES button and select the “TEMP ADJUS” mode.
3. “TEMP =
” and the current temperature data will be displayed.
4. To save the data, press the YES button.
When not saving the data, press the NO button.
5. When the YES button is pressed, “TEMP =
SAV” will be
displayed for some time, followed by “TEMP ADJUS”.
When the NO button is pressed, “TEMP ADJUS” will be dis-
played.
When the NO button is pressed, “TEMP ADJUS” will be dis-
played.
Specifications :
The “TEMP =
” should be within “E0 - EF”, “F0 - FF”, “00 -
0F”, “10 - 1F” and “20 - 2F”.
Laser Power Adjustment
Connection :
Laser power
meter
meter
Optical pick-up
objective lens
objective lens
Digital voltmeter
BD board
TP (I + 5V)
TP (IOP)
Adjusting Method :
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. (When it cannot be set properly, press the
0 button
or
) button and move the optical pick-up.)
Connect the digital volt meter to TP (IOP) and TP (I+5V).
2. Rotate the AMS knob and display “LDPWR ADJUS”.
(Laser power : For adjustment)
3. Press the YES button twice and display “LD $ 4B = 3.5 m”.
4. Adjust RV102 of the BD board so that the reading of the laser
4. Adjust RV102 of the BD board so that the reading of the laser
power meter becomes 3.4 mW.
5. Press the YES button and display “LD $ 96 = 7.0 m”.
(Laser power : MO writing)
6. Check that the laser power meter and digital voltmeter readings
satisfy the specified value.
Specification :
Laser power meter reading : 7.0 ± 0.3 mW
Digital voltmeter reading : Optical pickup displayed value ± 10%
Digital voltmeter reading : Optical pickup displayed value ± 10%
(Optical pickup label)
+0.1
–0
–0
KMS
210A
27X40
B0825
B0825
n
lop = 82.5 mA in this case
lop (mA) = Digital voltmeter reading (mV)/ 1 (
lop (mA) = Digital voltmeter reading (mV)/ 1 (
Ω
)
7. Press the YES button and display “LD $ 0F = 0.7 m”.
(Laser power : MO reading)
8. Check that the laser power meter at this time satisfies the speci-
fied value.
Specification :
Laser power meter reading : 0.70 ± 0.1 mW
9. Press the NO button and display “LDPWR ADJUS”, and stop
laser emission.
(The NO button is effective at all times to stop the laser emis-
sion.)
(The NO button is effective at all times to stop the laser emis-
sion.)
— 34 —
Traverse Adjustment
Connection :
11. Rotate the AMS knob until the waveform of the oscilloscope
moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 3%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
In this adjustment, waveform varies at intervals of approx. 3%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
(Traverse Waveform)
VC
A
B
Specification A=B
12. Press the YES button, display “EFB = $ SAV” for a moment
and save the adjustment results in the non-volatile memory.
Next “EFBAL CD” is displayed. The disc stops rotating auto-
matically.
Next “EFBAL CD” is displayed. The disc stops rotating auto-
matically.
13. Press the
§OPEN/CLOSE button and remove the MO disc.
14. Load the check disc (MD) TDYS-1.
15. Press the YES button and display “EFB = $ CD”. Servo is
15. Press the YES button and display “EFB = $ CD”. Servo is
imposed automatically.
16. Rotate the AMS knob so that the waveform of the oscilloscope
moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 3%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
In this adjustment, waveform varies at intervals of approx. 3%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
(Traverse Waveform)
VC
A
B
Specification A=B
17. Press the YES button, display “EFB = $ SAV” for a moment
and save the adjustment results in the non-volatile memory.
Next “EFBAL ADJUS” is displayed.
Next “EFBAL ADJUS” is displayed.
18. Press the
§OPEN/CLOSE button and remove the test disc
TDYS-1.
Note 1 : Data will be erased during MO reading if 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.
BD board
TP (TEO)
TP (VC)
330k
Ω
10pF
Oscilloscope
Oscilloscope
BD board
TP (TEO)
TP (VC)
Adjusting method :
1. Connect an oscilloscope to TP (TEO) and TP (VC) of the BD
1. Connect an oscilloscope to TP (TEO) and TP (VC) of the BD
board.
2. Load a MO disc (any available on the market).
3. Press the
3. Press the
0 button or ) button and move the optical pick-
up outside the pit.
4. Rotate the AMS knob and display “EFBAL ADJUS”.
5. Press the YES button and display “EFBAL MO-W”.
5. Press the YES button and display “EFBAL MO-W”.
(Laser power WRITE power/Focus servo ON/tracking servo
OFF/spindle (S) servo ON)
OFF/spindle (S) servo ON)
6. Adjust RV101 of the BD board so that the waveform of the os-
cilloscope becomes the specified value.
(MO groove write power traverse adjustment)
(MO groove write power traverse adjustment)
(Traverse Waveform)
VC
A
B
Specification A = B
7. Press the YES button and display “EFB = $ MO-R”.
(Laser power : MO reading)
8. Rotate the AMS knob so that the waveform of the oscilloscope
becomes the specified value.
(When the AMS knob is rotated, the of “EFB = $ ” changes
and the waveform changes.) In this adjustment, waveform var-
ies at intervals of approx. 3%. Adjust the waveform so that the
specified value is satisfied as much as possible.
(MO groove read power traverse adjustment)
(When the AMS knob is rotated, the of “EFB = $ ” changes
and the waveform changes.) In this adjustment, waveform var-
ies at intervals of approx. 3%. Adjust the waveform so that the
specified value is satisfied as much as possible.
(MO groove read power traverse adjustment)
(Traverse Waveform)
VC
A
B
Specification A=B
9. Press the YES button, display “EFB = $ SAV” for a moment
and save the adjustment results in the non-volatile memory.
Next “EFBAL MO-P” is displayed.
Next “EFBAL MO-P” is displayed.
10. Press the YES button and display “EFB = $ MO-P”.
The optical pick-up moves to the pit area automatically and
servo is imposed.
servo is imposed.
— 35 —
Focus Bias Adjustment
Adjusting Method :
1. Load a continuously recorded disc (Refer to “Page 32 Creating
1. Load a continuously recorded disc (Refer to “Page 32 Creating
Continuously Recorded Disc”.).
2. Rotate the AMS knob and display “CPLAY MODE”.
3. Press the YES button twice and display “CPLAY MID”.
4. Press the NO button when “C1 =
3. Press the YES button twice and display “CPLAY MID”.
4. Press the NO button when “C1 =
AD =
” is displayed.
5. Rotate the AMS knob and display “FBIAS ADJUS”.
6. Press the YES button and display “
6. Press the YES button and display “
/
a =
”.
The first four digits indicate the C1 error rate, the two digits
after [/] indicate ADER, and the 2 digits after [a =] indicate the
focus bias value.
after [/] indicate ADER, and the 2 digits after [a =] indicate the
focus bias value.
7. Rotate the AMS knob in the clockwise direction and find the
focus bias value at which the C1 error rate becomes 220.
8. Press the YES button and display “
/
b =
”.
9. Rotate the AMS knob in the counterclockwise direction and find
the focus bias value at which the C1 error rate becomes 220.
10. Press the YES button and display “
/
c =
”.
11. Check that the C1 error rate is below 50 and ADER is 00. Then
press the YES button.
12. If the “(
” in “
-
-
(
” is above 20, press the YES
button.
If below 20, press the NO button and repeat the adjustment
from step 2 again.
If below 20, press the NO button and repeat the adjustment
from step 2 again.
13. Press the NO button and press the
§OPEN/CLOSE button to
remove the continuously recorded disc.
Note 1 : The relation between the C1 error and focus bias is as
shown in the following figure. Find points a and b in the
following figure using the above adjustment. The focal
point position C is automatically calculated from points a
and b.
following figure using the above adjustment. The focal
point position C is automatically calculated from points a
and b.
Note 2 : As the C1 error rate changes, perform the adjustment us-
ing the average value.
Error Rate Check
CD Error Rate Check
Checking Method :
1. Load a check disc (MD) TDYS-1.
2. Rotate the AMS knob and display “CPLAY MODE”.
3. Press the YES button twice and display “CPLAY MID”.
4. “C1 =
1. Load a check disc (MD) TDYS-1.
2. Rotate the AMS knob and display “CPLAY MODE”.
3. Press the YES button twice and display “CPLAY MID”.
4. “C1 =
AD =
” is displayed.
5. Check that the C1 error rate is below 20.
6. Press the NO button, stop playback, press the
6. Press the NO button, stop playback, press the
§OPEN/CLOSE
button, and remove the test disc.
MO Error Rate Check
Checking Method :
1. Load a continuously recorded disc (Refer to “Page 32 Creating
1. Load a continuously recorded disc (Refer to “Page 32 Creating
Continuously Recorded Disc”.).
2. Rotate the AMS knob and display “CPLAY MODE”.
3. Press the YES button twice and display “CPLAY MID”.
4. “C1 =
3. Press the YES button twice and display “CPLAY MID”.
4. “C1 =
AD =
” is displayed.
5. If the C1 error rate is below 50, check that ADER is 00.
6. Press the NO button, stop playback, press the
6. Press the NO button, stop playback, press the
§OPEN/CLOSE
button, and remove the continuously recorded disc.
Focus Bias Check
Change the focus bias and check the focus tolerance amount.
Checking Method :
1. Load a continuously recorded disc (Refer to “Page 32 Creating
Checking Method :
1. Load a continuously recorded disc (Refer to “Page 32 Creating
Continuously Recorded Disc”.).
2. Rotate the AMS knob and display “CPLAY MODE”.
3. Press the YES button twice and display “CPLAY MID”.
4. Press the NO button when “C1 =
3. Press the YES button twice and display “CPLAY MID”.
4. Press the NO button when “C1 =
AD =
” is displayed.
5. Rotate the AMS knob and display “FBIAS CHECK”.
6. Press the YES button and display “
6. Press the YES button and display “
/
c =
”.
The first four digits indicate the C1 error rate, the two digits
after [/] indicate ADER, and the 2 digits after [c =] indicate the
focus bias value.
Check that the C1 error is below 50 and ADER is 00.
after [/] indicate ADER, and the 2 digits after [c =] indicate the
focus bias value.
Check that the C1 error is below 50 and ADER is 00.
7. Press the YES button and display “
/
b =
”.
Check that the C1 error is not below 220 and ADER is not
above 00 every time.
above 00 every time.
8. Press the YES button and display “
/
a =
”.
Check that the C1 error is not below 220 and ADER is not above
00 every time.
00 every time.
9. Press the NO button, next press the
§OPEN/CLOSE button,
and remove the continuously recorded disc.
Note 1 : If the C1 error and ADER are above 00 at points a or b,
the focus bias adjustment may not have been carried out
properly. Adjust perform the beginning again.
properly. Adjust perform the beginning again.
C1 error
Focus bias value
(F. BIAS)
(F. BIAS)
b
220
c
a
— 36 —
Adjusting Points and Connecting Points
[BD BOARD] (SIDE A)
D101
IC191
[BD BOARD] (SIDE B)
(IOP)
(I + 5V)
RV101
(VC)
RV102
(TEO)
IC121
IC171
IC101
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