Sony CMT-J3MD / HCD-J3MD Service Manual ▷ View online
37
VC
A
B
Specified value : 10% or less of the offset value
Offset value (%) = X 100
I
A – BI
2 (A + B)
VC
A
B
Specified value : 10% or less of the offset value
Offset value (%) = X 100
I
A – BI
2 (A + B)
330 k
Ω
Oscilloscope
10pF
BD (MD) board
CN110 pin
3
(TE)
CN110 pin
1
(VC)
9. Press the ENTER/YES “R” button and display “EFB =
MO-P”.Then, the optical pick-up moves to the pit area
automatically and servo is locked.
automatically and servo is locked.
10. Observe the waveform of the oscilloscope, and check that the
specified value is satisfied. Do not press the lm/TUNING
– button or ML/TUNING + button.
– button or ML/TUNING + button.
(Traverse Waveform)
11. Press the ENTER/YES “R” button and display “EF MO CHECK”
The disc stops rotating automatically.
12. Press the A (MD) button and remove the disc.
13. Load the check disc (MD) TDYS-1.
14. Press the ML/TUNING + button and display “EF CD
13. Load the check disc (MD) TDYS-1.
14. Press the ML/TUNING + button and display “EF CD
CHECK”.
15. Press the ENTER/YES “R” button and display “EFB =
CD”. Servo is locked automatically.
16. Observe the waveform of the oscilloscope, and check that the
specified value is satisfied. Do not press the lm/TUNING
– button or ML/TUNING + button.
– button or ML/TUNING + button.
(Traverse Waveform)
17. Press the ENTER/YES “R” button and display “EF CD
CHECK”.
18. Press the A (MD) 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
oscilloscope as shown in the following figure so that it can
be seen more clearly.
be seen more clearly.
5-6-4. Focus Bias Check
Change the focus bias and check the focus tolerance amount.
Checking Procedure :
1. Load a test disk (MDW-74/AU-1).
2. Press the lm/TUNING – button or ML/TUNING
Checking Procedure :
1. Load a test disk (MDW-74/AU-1).
2. Press the lm/TUNING – button or ML/TUNING
+ button and display “CPLAY MODE”.
3. Press the ENTER/YES “R” button twice and display “CPLAY
MID”.
4. Press the MENU/NO “R” button when “C1 =
AD =
”
is displayed.
5. Press the lm/TUNING – button or ML/TUNING
+ button and display “FBIAS CHECK”.
6. Press the ENTER/YES “R” 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 50 or less and ADER is 2 or less.
after “/” indicate ADER, and the 2 digits after “c =” indicate the
focus bias value.
Check that the C1 error is 50 or less and ADER is 2 or less.
7. Press the ENTER/YES “R” button and display “
/
b =
”.
Check that the C1 error is 220 or less and ADER is 2 or less.
8. Press the ENTER/YES “R” button and display “
/
a =
”.
Check that the C1 error is 220 or less and ADER is 2 or less.
9. Press the MENU/NO “R” button, next press the A (MD)
button, and remove the test disc.
5-6-5. C PLAY Checking
MO Error Rate Check
Checking Procedure :
1. Load a test disk (MDW-74/AU-1).
2. Press the lm/TUNING – button or ML/TUNING
1. Load a test disk (MDW-74/AU-1).
2. Press the lm/TUNING – button or ML/TUNING
+ button and display “CPLAY MODE”.
3. Press the ENTER/YES “R” button and display “CPLAY MID”.
4. The display changes to “C1 =
4. The display changes to “C1 =
AD =
”.
5. If the C1 error rate is 50 or less, check that ADER is 2 or less.
6. Press the MENU/NO “R” button, stop playback, press the A
6. Press the MENU/NO “R” button, stop playback, press the A
(MD) button, and test disc.
CD Error Rate Check
Checking Procedure :
1. Load a check disc (MD) TDYS-1.
2. Press the lm/TUNING – button or ML/TUNING
1. Load a check disc (MD) TDYS-1.
2. Press the lm/TUNING – button or ML/TUNING
+ button and display “CPLAY MODE”.
3. Press the ENTER/YES “R” button twice and display “CPLAY
MID”.
4. The display changes to “C1 =
AD =
”.
5. Check that the C1 error rate is 20 or less.
6. Press the MENU/NO “R” button, stop playback, press the A
6. Press the MENU/NO “R” button, stop playback, press the A
(MD) button, and the test disc.
5-6-6. Self-Recording/playback Check
Prepare a continuous recording disc using the unit to be repaired
and check the error rate.
and check the error rate.
Checking Procedure :
1. Insert a recordable disc (blank disc) into the unit.
2. Press the lm/TUNING – button or ML/TUNING
1. Insert a recordable disc (blank disc) into the unit.
2. Press the lm/TUNING – button or ML/TUNING
+ button to display “CREC MODE”.
3. Press the ENTER/YES “R” button to display the “CREC MID”.
4. When recording starts, z MD indicator lights up displayed,
4. When recording starts, z MD indicator lights up displayed,
this becomes “CREC (@@@@)" (@@@@ is the address), and
recording starts.
recording starts.
5. About 8 seconds later, press the MENU/NO “R” button to stop
continuous recording.
6. Press the lm/TUNING – button or ML/TUNING
+ button to display “C PLAY MODE”.
7. Press the ENTER/YES “R” button to display “C PLAY MID”.
38
Laser power
meter
meter
Optical pick-up
objective lens
objective lens
Digital voltmeter
BD (MD) board
CN110 pin
5
(I+3V)
CN110 pin
4
(IOP)
8. “C1 =
AD =
” will be displayed.
9. Check that the C1 error becomes 50 or less and the AD error 2
or less.
10. Press the MENU/NO “R” button to stop playback, and press
the A (MD) button and remove the disc.
5-7. Initial Setting of Adjustment Value
Note:
This is mode that is used to return the adjustment results recordedin
the non-volatile memory to the initial setting value. However the
results of the temperature compensation offset adjustment cannot
be returned to the initial setting value.
If the setting are returned to the initial setting value, perform all
adjustments again excluding the temperature compensation offset
adjustment.
For details of the initial setting, refer to “5-4. Precautions on
Adjustments” and execute the initial setting before the adjustment
as required.
This is mode that is used to return the adjustment results recordedin
the non-volatile memory to the initial setting value. However the
results of the temperature compensation offset adjustment cannot
be returned to the initial setting value.
If the setting are returned to the initial setting value, perform all
adjustments again excluding the temperature compensation offset
adjustment.
For details of the initial setting, refer to “5-4. Precautions on
Adjustments” and execute the initial setting before the adjustment
as required.
Setting Procedure :
1. Press the lm/TUNING – button or ML/TUNING +
1. Press the lm/TUNING – button or ML/TUNING +
button to display “ADJ CLEAR”.
2. Press the ENTER/YES “R” button. “Complete!” will be
displayed momentarily and initial setting will be executed, after
which “ADJ CLEAR” will be displayed.
which “ADJ CLEAR” 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 pickup 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 pickup 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. When the power ON, press the ?/1 button while pressing the
1. When the power ON, press the ?/1 button while pressing the
s button and z TAPE button together.
2. Press the lm/TUNING – button or ML/TUNING +
button to display “[Service]”, and press the ENTER/YES “R”
button. (If nothing is displayed, press the FUNCTION button
and set the function to “MD”.
button. (If nothing is displayed, press the FUNCTION button
and set the function to “MD”.
3. Press the lm/TUNING – button or ML/TUNING +
button to display “Iop Write”, and press the ENTER/YES “R”
button.
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 : Press the lm/TUNING – button
or ML/TUNING + button.
To select the digit : Press the SYNCHRO REC button.
or ML/TUNING + button.
To select the digit : Press the SYNCHRO REC button.
Note: If a message “Cannot SYNC!” or “NO TAPE” appears
momentarily, press the SYNCHRO REC button several times
until “CD-MD SYNC?” appears momentarily.
until “CD-MD SYNC?” appears momentarily.
6. When the ENTER/YES “R” 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 “R” button.
8. “Complete!” will be displayed momentarily. The value will be
recorded in the non-volatile memory and the display will become
“Iop Write”.
“Iop Write”.
Display Procedure :
1. Press the lm/TUNING – button or ML/TUNING +
1. Press the lm/TUNING – button or ML/TUNING +
button to display “Iop Read”.
2. When the ENTER/YES “R” button is pressed, “@@.@/##.#”
will be displayed and the recorded contents are displayed.
@@.@ indicates the Iop value labeled on the pick-up.
##.# indicates the Iop value after adjustment
@@.@ indicates the Iop value labeled on the pick-up.
##.# indicates the Iop value after adjustment
3. To end, press the MENU/NO “R” button to display “Iop Read”.
5-9. 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
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 of 22 ˚C to 28 ˚C.
when 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 temperature.
Adjusting Procedure :
1. Press the lm/TUNING – button or ML/TUNING +
1. Press the lm/TUNING – button or ML/TUNING +
button and display “TEMP ADJUST”.
2. Press the ENTER/YES “R” button and select the “TEMP
ADJUST” mode.
3. “TEMP =
[OK]” and the current temperature data will be
displayed.
4. To save the data, press the ENTER/YES “R” button.
When not saving the data, press the MENU/NO “R” button.
5. When the ENTER/YES “R” button is pressed, “TEMP =
SAVE” will be displayed and turned back to “TEMP ADJUST”
display then. When the MENU/NO “R” button is pressed,
“TEMP ADJUST” will be displayed immediately.
display then. When the MENU/NO “R” button is pressed,
“TEMP ADJUST” will be displayed immediately.
Specified Value :
The “TEMP =
” should be within “E0 - EF”, “F0 - FF”, “00 -
0F”, “10 - 1F” and “20 - 2F”.
5-10. LASER POWER ADJUSTMENT
Before starting adjustment:
Check the IOP value of the optical pick-up before adjustments.
(Refer to “5-8. Recording and Displaying IOP Information”.)
Check the IOP value of the optical pick-up before adjustments.
(Refer to “5-8. Recording and Displaying IOP Information”.)
Connection :
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 lm/
TUNING – button or ML/TUNING + button continuously
to move the optical pick-up.)
Connect the digital voltmeter to CN110 pin 5 (I+3V) and CN110
pin 4 (IOP).
TUNING – button or ML/TUNING + button continuously
to move the optical pick-up.)
Connect the digital voltmeter to CN110 pin 5 (I+3V) and CN110
pin 4 (IOP).
2. Press the lm/TUNING – button or ML/TUNING +
button and display “LDPWR ADJUST”.
(Laser power : For adjustment)
(Laser power : For adjustment)
39
5-11. TRAVERSE ADJUSTMENT
Connection :
V : 0.5 V/div
H : 10 ms/div
Input : DC mode
H : 10 ms/div
Input : DC mode
Oscilloscope
BD (MD) board
CN110 pin
3
(TE)
CN110 pin
1
(VC)
VC
A
B
Specification : A = B
VC
A
B
Specification : A = B
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
)
(For details of the method for checking
this value, refer to “5-8. Recording and
Displaying IOP Information”.)
this value, refer to “5-8. Recording and
Displaying IOP Information”.)
10. Press the MENU/NO “R” button and display “LDPWR
CHECK” and stop the laser emission.
(The MENU/NO “R” button is effective at all times to stop the
laser emission.)
(The MENU/NO “R” button is effective at all times to stop the
laser emission.)
11. Press the lm/TUNING – button or ML/TUNING +
button to display “Iop Write”.
12. Press the ENTER/YES “R” button. When the display becomes
Ref=@@@.@ (@ is an arbitrary number), press the ENTER/
YES “R” button to display “Measu=@@@.@” (@ is an
arbitrary number).
YES “R” 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 : Press the lm/TUNING – button
or ML/TUNING + button.
To select the digit : Press the SYNCHRO REC button.
Selection of digit : Press the SYNCHRO REC button and the
To select the number : Press the lm/TUNING – button
or ML/TUNING + button.
To select the digit : Press the SYNCHRO REC button.
Selection of digit : Press the SYNCHRO REC button and the
ENTER/START button at the same time
quickly. Note 1:
quickly. Note 1:
Note 1: If a message “Cannot SYNC!” or “NO TAPE” appears
momentarily, press SYNCHRO REC button several times
until “CD-MD SYNC?” appears momentarily.
until “CD-MD SYNC?” appears momentarily.
14. When the ENTER/YES “R” 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”.
the non-volatile memory and the display will become “Iop
Write”.
Note 2: After step 9, each time the ENTER/YES “R” 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.
7. Press the ENTER/YES “R” 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. Press the lm/TUNING – button or ML/TUNING +
button so that the waveform of the oscilloscope becomes the
specified value.
(When the lm/TUNING – button or ML/TUNING
+ button is pressed, the
specified value.
(When the lm/TUNING – button or ML/TUNING
+ button is pressed, the
of “EFB-
” changes and the
waveform changes.) In this adjustment, waveform varies at
intervals of approx. 2%. Adjust the waveform so that the specified
value is satisfied as much as possible.
(Write power traverse adjustment)
intervals of approx. 2%. Adjust the waveform so that the specified
value is satisfied as much as possible.
(Write power traverse adjustment)
(Traverse Waveform)
3. Press the ENTER/YES “R” button once and display “LD 0.9
mW $
”.
4. Press the lm/TUNING – button or ML/TUNING +
button so that the reading of the laser power meter becomes 0.85
to 0.91 mW. Press the ENTER/YES “R” button after setting the
range knob of the laser power meter, and save the adjustment
results. (“LD SAVE $
to 0.91 mW. Press the ENTER/YES “R” button 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. Press the lm/TUNING – button or ML/TUNING +
button so that the reading of the laser power meter becomes
6.9 to 7.1 mW, press the ENTER/YES “R” button and save it.
6.9 to 7.1 mW, press the ENTER/YES “R” button and save it.
Note : Do not perform the emission with 7.0 mW more than 15
seconds continuously.
7. Then, press the lm/TUNING – button or ML/
TUNING + button and display “LDPWR CHECK”.
8. Press the ENTER/YES “R” button once and display “LD 0.9
mW $
”. Check that the reading of the laser power meter
becomes 0.85 to 0.91 mW.
9. Press the ENTER/YES “R” 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
±
0.1 mW
Digital voltmeter reading : Optical pick-up displayed value
±
10%
(Optical pick-up label)
Adjusting Procedure :
1. Connect an oscilloscope to CN110 pin 3 (TE) and CN110 pin
1. Connect an oscilloscope to CN110 pin 3 (TE) and CN110 pin
1
(VC) of the BD board.
2. Load a disc (any available on the market). (Refer to Note 1.)
3. Press the ML/TUNING + button continuously and move
3. Press the ML/TUNING + button continuously and move
the optical pick-up outside the pit.
4. Press the lm/TUNING – button or ML/TUNING +
button and display “EF MO ADJUST”.
5. Press the ENTER/YES “R” button and display “EFB =
MO-
R”.
(Laser power READ power/Focus servo ON/tracking servo OFF/
spindle (S) servo ON)
(Laser power READ power/Focus servo ON/tracking servo OFF/
spindle (S) servo ON)
6. Press the lm/TUNING – button or ML/TUNING +
button so that the waveform of the oscilloscope becomes the
specified value.
(When the lm/TUNING – button or ML/TUNING
+ button is pressed, the
specified value.
(When the lm/TUNING – button or ML/TUNING
+ button is pressed, the
of “EFB=
” changes and the
waveform changes.) In this adjustment, waveform varies at
intervals of approx. 2%. Adjust the waveform so that the specified
value is satisfied as much as possible.
(Read power traverse adjustment)
intervals of approx. 2%. Adjust the waveform so that the specified
value is satisfied as much as possible.
(Read power traverse adjustment)
(Traverse Waveform)
40
9. Press the ENTER/YES “R” 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.
servo is imposed.
11. Press the lm/TUNING – button or ML/TUNING +
button until the waveform of the oscilloscope 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.
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.
(Traverse Waveform)
12. Press the ENTER/YES “R” button, and save the adjustment
results in the non-volatile memory. (“EFB =
SAVE” will be
displayed for a moment.)
Next “EF MO ADJUST” is displayed. The disc stops rotating
automatically.
Next “EF MO ADJUST” is displayed. The disc stops rotating
automatically.
13. Press the A (MD) button and remove the disc.
14. Load the check disc (MD) TDYS-1.
15. Press the lm/TUNING – button or ML/TUNING +
14. Load the check disc (MD) TDYS-1.
15. Press the lm/TUNING – button or ML/TUNING +
button and display “EF CD ADJUST”.
16. Press the ENTER/YES “R” button and display “EFB =
CD”. Servo is locked automatically.
17. Press the lm/TUNING – button or ML/TUNING +
button so that the waveform of the oscilloscope 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.
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.
(Traverse Waveform)
18. Press the ENTER/YES “R” button, display “EFB =
SAVE”
for a moment and save the adjustment results in the non-volatile
memory.
Next “EF CD ADJUST” will be displayed.
memory.
Next “EF CD ADJUST” will be displayed.
19. Press the A (MD) 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
oscilloscope as shown in the following figure so that it can
be seen more clearly.
be seen more clearly.
5-12. FOCUS BIAS ADJUSTMENT
Adjusting Procedure :
1. Load a test disk (MDW-74/AU-1).
2. Press the lm/TUNING – button or ML/TUNING +
1. Load a test disk (MDW-74/AU-1).
2. Press the lm/TUNING – button or ML/TUNING +
button and display “CPLAY MODE”.
3. Press the ENTER/YES “R” button and display “CPLAY MID”.
4. Press the MENU/NO “R” button when “C1 =
4. Press the MENU/NO “R” button when “C1 =
AD =
”
is displayed.
5. Press the lm/TUNING – button or ML/TUNING +
button and display “FBIAS ADJUS”.
6. Press the ENTER/YES “R” 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. Press the ML/TUNING + button and find the focus bias
value at which the C1 error rate becomes about 200 (Refer to
Note 2).
Note 2).
8. Press the ENTER/YES “R” button and display “
/
b =
”.
9. Press the lm/TUNING – button and find the focus bias
value at which the C1 error rate becomes about 200.
10. Press the ENTER/YES “R” button and display “
/
c =
”.
11. Check that the C1 error rate is 50 or less and ADER is 00. Then
press the ENTER/YES “R” button.
12. If the “(
)” in “
-
-
(
)” is above 20, press the ENTER/
YES “R” button.
If 20 or less, press the MENU/NO“R” button and repeat the
adjustment from step 2.
If 20 or less, press the MENU/NO“R” button and repeat the
adjustment from step 2.
13. Press the A (MD) button to remove the test disc.
Selection of digit : Press the SYNCHRO REC button and the
ENTER/START button at the same time
quickly. Note 1:
quickly. Note 1:
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 using
the average vaue.
VC
A
B
Specification : A = B
VC
A
B
Specification : A = B
330 k
Ω
Oscilloscope
10pF
BD (MD) board
CN110 pin
3
(TE)
CN110 pin
1
(VC)
C1 error
about
200
200
b
c
a
Focus bias value
(F. BIAS)
(F. BIAS)
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