Sony DHC-NX5MD / HMC-NX5MD Service Manual ▷ View online
33
5-6-7. Focus Bias Check
Change the focus bias and check the focus tolerance amount.
Checking Procedure :
1. Load a continuously recorded test disc (MDW-74/GA-1).
Change the focus bias and check the focus tolerance amount.
Checking Procedure :
1. Load a continuously recorded test disc (MDW-74/GA-1).
(Refer to “5-5. Using the Continuously Recorded Disc”.)
2. Rotate the MD JOG knob and display “CPLAY 1MODE” (C34).
3. Press the ENTER/YES button and display “CPLAY1 MID”.
4. Press the MENU/NO button when “C =
3. Press the ENTER/YES button and display “CPLAY1 MID”.
4. Press the MENU/NO button when “C =
AD =
” is
displayed.
5. Rotate the MD JOG knob and display “FBIAS CHECK” (C16).
6. Press the ENTER/YES button and display “
6. Press the ENTER/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 20 and ADER is below 2.
after [/] indicate ADER, and the 2 digits after [c =] indicate the
focus bias value.
Check that the C1 error is below 20 and ADER is below 2.
7. Press the ENTER/YES button and display “
/
b =
”.
Check that the C1 error is below 100 and ADER is below 2.
8. Press the ENTER/YES button and display “
/
a =
”.
Check that the C1 error is below 100 and ADER is below 2.
9. Press the MENU/NO button, next press the A button, and
remove the test disc.
5-6-8. C PLAY Check
MO Error Rate Check
Checking Procedure :
1. Load a continuously recorded test disc (MDW-74/GA-1).
Checking Procedure :
1. Load a continuously recorded test disc (MDW-74/GA-1).
(Refer to “5-5. Using the Continuously Recorded Disc”.)
2. Rotate the MD JOG knob and display “CPLAY1MODE” (C34).
3. Press the ENTER/YES button and display “CPLAY1 MID”.
4. The display changes to “C1 =
3. Press the ENTER/YES button and display “CPLAY1 MID”.
4. The display changes to “C1 =
AD =
”.
5. If the C1 error rate is below 20, check that ADER is 00.
6. Press the MENU/NO button, stop playback, press the A but-
6. Press the MENU/NO button, stop playback, press the A but-
ton, and test disc.
CD Error Rate Check
Checking Procedure :
1. Load a check disc (MD) TDYS-1.
2. Rotate the MD JOG knob and display “CPLAY1MODE” (C34).
3. Press the ENTER/YES button twice and display “CPLAY1 MID”.
4. The display changes to “C1 =
Checking Procedure :
1. Load a check disc (MD) TDYS-1.
2. Rotate the MD JOG knob and display “CPLAY1MODE” (C34).
3. Press the ENTER/YES button twice and display “CPLAY1 MID”.
4. The display changes to “C1 =
AD =
”.
5. Check that the C1 error rate is below 20.
6. Press the MENU/NO button, stop playback, press the A but-
6. Press the MENU/NO button, stop playback, press the A but-
ton, and the test disc.
5-6-9. Self-Recording/playback Check
Prepare a continuous recording disc using the unit to be repaired
and check the error rate.
Prepare a continuous recording disc using the unit to be repaired
and check the error rate.
Checking Procedure :
1. Insert a recordable test disc (MDW-74/GA-1) into the unit.
2. Rotate the MD JOG knob to display “CREC 1MODE” (C35).
3. Press the ENTER/YES button to display the “CREC1 MID”.
4. When recording starts, “
1. Insert a recordable test disc (MDW-74/GA-1) into the unit.
2. Rotate the MD JOG knob to display “CREC 1MODE” (C35).
3. Press the ENTER/YES button to display the “CREC1 MID”.
4. When recording starts, “
REC
” is displayed, this becomes
“CREC (@@@@)” (@@@@ is the address), and recording
starts.
starts.
5. About 1 minute later, press the MENU/NO button to stop
continuous recording.
6. Rotate the MD JOG knob to display “CPLAY1MODE” (C34).
7. Press the ENTER/YES button to display “C PLAY1 MID”.
8. “C1 =
7. Press the ENTER/YES button to display “C PLAY1 MID”.
8. “C1 =
AD =
” will be displayed.
9. Check that the C1 error becomes below 20 and the AD error
below 2.
10. Press the MENU/NO button to stop playback, and press the
A button and remove the disc.
330 k
Ω
Oscilloscope
10pF
BD (MD) board
CN105 pin 4 (TE)
CN105 pin 6 (VC)
16. Observe the waveform of the oscilloscope, and check that the
specified value is satisfied. Do not rotate the MD JOG knob.
(Traverse Waveform)
17. Press the ENTER/YES button and display “EF CD CHECK”
(C15).
18. Press the A button and remove the check disc (MD) TDYS-1.
Note 1 : MO reading data will be erased during 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.
VC
A
B
Specified value : Below 10% offset value
Offset value (%) = X 100
IA – BI
2 (A + B)
34
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. (When it cannot be set properly, press the m button
or M button to move the optical pick-up.)
Connect the digital volt meter to CN105 pin 1 (I+3V) and
CN105 pin 2 (IOP).
or M button to move the optical pick-up.)
Connect the digital volt meter to CN105 pin 1 (I+3V) and
CN105 pin 2 (IOP).
2. Rotate the MD JOG knob and display “LDPWR ADJUS” (C04).
(Laser power : For adjustment)
3. Press the ENTER/YES button once and display “LD 0.9 mW $
”.
4. Rotate the MD JOG knob so that the reading of the laser power
meter becomes 0.85 to 0.91 mW. Press the ENTER/YES but-
ton after setting the range knob of the laser power meter, and
save the adjustment results. (“LD SAVE $
ton 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. Rotate the MD JOG knob so that the reading of the laser power
meter becomes 6.9 to 7.1 mW, press the ENTER/YES button
and save it.
and save it.
Note : Do not perform the emission with 7.0 mW more than 15
seconds continuously.
Note :
1. Usually, do not perform this adjustment.
2. Perform this adjustment in an ambient temperature of 22 ˚C to
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.
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 temperature of this part has become the ambient tempera-
ture.
ture.
Adjusting Procedure :
1. Rotate the MD JOG knob and display “TEMP ADJUS” (C03).
2. Press the ENTER/YES button and select the “TEMP ADJUS”
1. Rotate the MD JOG knob and display “TEMP ADJUS” (C03).
2. Press the ENTER/YES button and select the “TEMP ADJUS”
(C03) mode.
3. “TEMP =
[OK]” and the current temperature data will be
displayed.
4. To save the data, press the ENTER/YES button.
When not saving the data, press the MENU/NO button.
5. When the ENTER/YES button is pressed, “TEMP =
SAVE”
will be displayed and turned back to “TEMP ADJUS” (C03)
display then. When the MENU/NO button is pressed, “TEMP
ADJUS” (C03) will be displayed immediatelly.
display then. When the MENU/NO button is pressed, “TEMP
ADJUS” (C03) will be displayed immediatelly.
Specified Value :
The “TEMP =
The “TEMP =
” should be within “E0 - EF”, “F0 - FF”, “00 -
0F”, “10 - 1F” and “20 - 2F”.
5-10. LASER POWER ADJUSTMENT
Check the Iop value of the optical pick-up before adjustments.
(Refer to 5-8. Recording and Displaying the Iop Information.)
(Refer to 5-8. Recording and Displaying the Iop Information.)
Connection :
5-7. INITIAL SETTING OF ADJUSTMENT VALUE
Note:
Mode which sets the adjustment results recorded in the non-vola-
tile memory to the initial setting value. However the results of the
temperature compensation offset adjustment will not change to the
initial setting value.
If initial setting is performed, perform all adjustments again ex-
cluding the temperature compensation offset adjustment.
For details of the initial setting, refer to “5-4. Precautions for Ad-
justments” and execute the initial setting before the adjustment as
required.
Mode which sets the adjustment results recorded in the non-vola-
tile memory to the initial setting value. However the results of the
temperature compensation offset adjustment will not change to the
initial setting value.
If initial setting is performed, perform all adjustments again ex-
cluding the temperature compensation offset adjustment.
For details of the initial setting, refer to “5-4. Precautions for Ad-
justments” and execute the initial setting before the adjustment as
required.
Setting Procedure :
1. Rotate the MD JOG knob to display “ADJ CLEAR” (C28).
2. Press the ENTER/YES button. “Complete!” will be displayed
1. Rotate the MD JOG knob to display “ADJ CLEAR” (C28).
2. Press the ENTER/YES button. “Complete!” will be displayed
momentarily and initial setting will be executed, after which “ADJ
CLEAR” (C28) will be displayed.
CLEAR” (C28) will be displayed.
5-8. RECORDING AND DISPLAYING THE Iop
INFORMATION
The IOP data can be recorded in the non-volatile memory. The Iop
value on the label of the optical pick-up and the Iop value after the
adjustment will be recorded. Recording these data eliminates the
need to read the label on the optical pick-up.
value on the label of the optical pick-up and the Iop value after the
adjustment will be recorded. Recording these data eliminates the
need to read the label on the optical pick-up.
Recording Procedure :
1. While pressing the MD JOG knob and s button, connect the
1. While pressing the MD JOG knob and s button, connect the
power plug to the outlet, and release the MD JOG knob and s
button.
button.
2. Rotate the MD JOG knob to display “[Service]”, and press the
ENTER/YES button.
3. Rotate the MD JOG knob to display “Iop Write” (C05), and
press the ENTER/YES button.
4. The display becomes Ref=@@@.@ (@ is an arbitrary number)
and the numbers which can be changed will blink.
5. Input the Iop value written on the optical pick-up.
To select the number : Rotate the MD JOG knob.
To select the digit : Press the MD JOG knob
To select the digit : Press the MD JOG knob
6. When the ENTER/YES button is pressed, the display becomes
“Measu=@@@.@” (@ is an arbitrary number).
7. As the adjustment results are recorded for the 6 value. Leave it
as it is and press the ENTER/YES button.
8. “Complete!” will be displayed momentarily. The value will be
recorded in the non-volatile memory and the display will be-
come “Iop Write” (C05).
come “Iop Write” (C05).
Display Procedure :
1. Rotate the MD JOG knob to display “Iop Read” (C26).
2. “@@.@/##.#” is displayed and the recorded contents are dis-
1. Rotate the MD JOG knob to display “Iop Read” (C26).
2. “@@.@/##.#” is displayed and the recorded contents are dis-
played.
@@.@ indicates the Iop value labeled on the optical pick-up.
##.# indicates the Iop value after adjustment
@@.@ indicates the Iop value labeled on the optical pick-up.
##.# indicates the Iop value after adjustment
3. To end, press the MD JOG button or MENU/NO button to
display “Iop Read” (C26).
5-9. TEMPERATURE COMPENSATION OFFSET
ADJUTMENT
Save the temperature data at that time in the non-volatile memory
as 25 ˚C reference data.
as 25 ˚C reference data.
Laser power
meter
meter
Optical pick-up
objective lens
objective lens
Digital volt meter
BD (MD) board
CN105 pin 1 (I+3V)
CN105 pin 2 (IOP)
35
KMS
260B
20101
H0576
H0576
Iop = 57.6 mA in this case
Iop (mA) = Digital voltmeter reading (mV)/1 (
Iop (mA) = Digital voltmeter reading (mV)/1 (
Ω)
7. Then, rotate the MD JOG knob and display “LDPWR CHECK”
(C13).
8. Press the ENTER/YES button once and display “LD 0.9 mW $
”. Check that the reading of the laser power meter become
0.85 to 0.91 mW.
9. Press the ENTER/YES button once more and display “LD 7.0
mW $
”. Check that the reading the laser power meter and
digital volt meter satisfy the specified value.
Note down the digital voltmeter reading value.
Note down the digital voltmeter reading value.
Specified Value :
Laser power meter reading : 7.0 ± 0.2 mW
Digital voltmeter reading : optical pick-up displayed value ± 10%
Laser power meter reading : 7.0 ± 0.2 mW
Digital voltmeter reading : optical pick-up displayed value ± 10%
(Optical pick-up label)
10. Press the MENU/NO button and display “LDPWR CHECK”
(C13) and stop the laser emission.
(The MENU/NO button is effective at all times to stop the
laser emission.)
(The MENU/NO button is effective at all times to stop the
laser emission.)
11. Rotate the MD JOG knob to display “Iop Write” (C05).
12. Press the ENTER/YES button. When the display becomes
12. Press the ENTER/YES button. When the display becomes
Ref=@@@.@ (@ is an arbitrary number), press the ENTER/
YES button to display “Measu=@@@.@” (@ is an arbitrary
number).
YES button to display “Measu=@@@.@” (@ is an arbitrary
number).
13. The numbers which can be changed will blink. Input the Iop
value noted down at step 9.
To select the number : Rotate the MD JOG knob.
To select the digit : Press the MD JOG knob
To select the number : Rotate the MD JOG knob.
To select the digit : Press the MD JOG knob
14. When the ENTER/YES button is pressed, “Complete!” will be
displayed momentarily. The value will be recorded in the non-
volatile memory and the display will become “Iop Write” (C05).
volatile memory and the display will become “Iop Write” (C05).
Note 1: After step 4, each time the ENTER/YES button is pressed,
the display will be switched between “LD 0.7 mW $
”,
“LD 6.2 mW $
”, and “LD Wp $
”. Nothing needs to
be performed here.
(For details of the method for checking
this value, refer to “5-8. Recording and
Displaying the IOP Information”.)
this value, refer to “5-8. Recording and
Displaying the IOP Information”.)
5-12. TRAVERSE ADJUSTMENT
Connection :
Adjusting Procedure :
1. Connect an oscilloscope to CN105 pin 4 (TE) and CN105 pin
1. Connect an oscilloscope to CN105 pin 4 (TE) and CN105 pin
6
(VC) of the BD board.
2. Load a test disc (MDW-74/GA-1). (Refer to Note 1.)
3. Press the M button and move the optical pick-up outside the
3. Press the M button and move the optical pick-up outside the
pit.
4. Rotate the MD JOG knob and display “EF MO ADJUS” (C14).
5. Press the ENTER/YES button and display “EFB =
5. Press the ENTER/YES button and 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 MD JOG knob so that the waveform of the oscillo-
scope becomes the specified value.
(When the MD JOG knob is rotated, the
(When the MD JOG knob is rotated, the
of “EFB=
”
changes and the waveform changes.) In this adjustment, wave-
form varies at intervals of approx. 2%. Adjust the waveform so
that the specified value is satisfied as much as possible.
(Read power traverse adjustment)
form varies at intervals of approx. 2%. Adjust the waveform so
that the specified value is satisfied as much as possible.
(Read power traverse adjustment)
(Traverse Waveform)
7. Press the ENTER/YES button and save the result of adjustment
to the non-volatile memory (“EFB =
SAVE” will be displayed
for a moment. Then “EFB =
MO-W” will be displayed).
8. Rotate the MD JOG knob so that the waveform of the oscillo-
scope becomes the specified value.
(When the MD JOG knob is rotated, the
(When the MD JOG knob is rotated, the
of “EFB-
MO-
W” changes and the waveform changes.) In this adjustment,
waveform varies at intervals of approx. 2%. Adjust the wave-
form so that the specified value is satisfied as much as possible.
(Write power traverse adjustment)
waveform varies at intervals of approx. 2%. Adjust the wave-
form so that the specified value is satisfied as much as possible.
(Write power traverse adjustment)
(Traverse Waveform)
9. Press the ENTER/YES button, and save the adjustment results
in the non-volatile memory. (“EFB =
SAVE” will be displayed
for a moment.)
10. “EFB =
MO-P”. will be displayed.
The optical pick-up moves to the pit area automatically and servo
is imposed.
is imposed.
V : 0.5 V/div
H : 10 ms/div
Input : DC mode
H : 10 ms/div
Input : DC mode
Oscilloscope
BD (MD) board
CN105 pin 4 (TE)
CN105 pin 6 (VC)
VC
A
B
Specification A = B
VC
A
B
Specification A = B
R
5-11. Iop NV SAVE
Write the reference values in the nonvolatile memory to perform
“Iop compare”. As this involves rewriting the reference values, do
not perform this procedure except when adjusting the laser power
during replacement of the optical pick-up and when replacing the
IC102. Otherwise the optical pick-up check may deteriorate.
Write the reference values in the nonvolatile memory to perform
“Iop compare”. As this involves rewriting the reference values, do
not perform this procedure except when adjusting the laser power
during replacement of the optical pick-up and when replacing the
IC102. Otherwise the optical pick-up check may deteriorate.
Note: Perform this function with the optical pick-up set at room
temperature.
Procedure
1. Rotate the MD JOG knob to display “Iop NV Save” (C06).
2. Press the ENTER/YES button and display “Iop [stop]”.
3. After the display changes to “Iop =xxsave?”, press the ENTER/
1. Rotate the MD JOG knob to display “Iop NV Save” (C06).
2. Press the ENTER/YES button and display “Iop [stop]”.
3. After the display changes to “Iop =xxsave?”, press the ENTER/
YES button.
4. After “Complete!” is displayed momentarily, the display changes
to “Iop 7.0 mW”.
5. After the display changes to “Iop=yysave?”, press the ENTER/
YES button.
6. When “Complete!” is displayed, it means that Iop NV saving
has been completed.
36
11. Rotate the MD JOG knob until the waveform of the oscillo-
scope moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
(Traverse Waveform)
12. Press the ENTER/YES button, and save the adjustment results
in the non-volatile memory. (“EFB =
SAVE” will be dis-
played for a moment.)
Next “EF MO ADJUS” (C07) is displayed. The disc stops ro-
tating automatically.
Next “EF MO ADJUS” (C07) is displayed. The disc stops ro-
tating automatically.
13. Press the A button and remove the disc.
14. Load the check disc (MD) TDYS-1.
15. Roteto MD JOG knob and display “EF CD ADJUS” (C08).
16. Press the ENTER/YES button and display “EFB =
14. Load the check disc (MD) TDYS-1.
15. Roteto MD JOG knob and display “EF CD ADJUS” (C08).
16. Press the ENTER/YES button and display “EFB =
CD”.
Servo is imposed automatically.
17. Rotate the MD JOG knob so that the waveform of the oscillo-
scope moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
(Traverse Waveform)
18. Press the ENTER/YES button, display “EFB =
SAVE” for
a moment and save the adjustment results in the non-volatile
memory.
Next “EF CD ADJUS” (C08) will be displayed.
memory.
Next “EF CD ADJUS” (C08) will be displayed.
19. Press the A button and remove the check disc (MD) TDYS-1.
Note 1 : MO reading data will be erased during 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.
5-13. FOCUS BIAS ADJUSTMENT
Adjusting Procedure :
1. Load a test disk (MDW-74/GA-1).
2. Rotate the MD JOG knob and display “CPLAY1MODE” (C34).
3. Press the ENTER/YES button and display “CPLAY1 MID”.
4. Press the MENU/NO button when “C1 =
1. Load a test disk (MDW-74/GA-1).
2. Rotate the MD JOG knob and display “CPLAY1MODE” (C34).
3. Press the ENTER/YES button and display “CPLAY1 MID”.
4. Press the MENU/NO button when “C1 =
AD =
” is
displayed.
5. Rotate the MD JOG knob and display “FBIAS ADJUS” (C09).
6. Press the ENTER/YES button and display “
6. Press the ENTER/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 MD JOG knob in the clockwise direction and find
the focus bias value at which the C1 error rate becomes 220
(Refer to Note 2).
(Refer to Note 2).
8. Press the ENTER/YES button and display “
/
b =
”.
9. Rotate the MD JOG knob in the counterclockwise direction
and find the focus bias value at which the C1 error rate becomes
220.
220.
10. Press the ENTER/YES button and display “
/
c =
”.
11. Check that the C1 error rate is below 20 and ADER is 00. Then
press the ENTER/YES button.
12. If the “(
” in “
-
-
(
” is above 20, press the ENTER/
YES button.
If below 20, press the MENU/NO button and repeat the
adjustment from step 2.
If below 20, press the MENU/NO button and repeat the
adjustment from step 2.
13. Press the A button to remove the test 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 vale.
VC
A
B
Specification A = B
VC
A
B
Specification A = B
330 k
Ω
Oscilloscope
10pF
BD (MD) board
CN105 pin 4 (TE)
CN105 pin 6 (VC)
C1 error
220
b
c
a
Focus bias value
(F. BIAS)
(F. BIAS)
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