Sony HCD-MD555 Service Manual ▷ View online
— 45 —
Traverse Check
Connection :
Adjusting Method :
1. Connect an oscilloscope to TP233 (TEO) and TP416 (VC) of
1. Connect an oscilloscope to TP233 (TEO) and TP416 (VC) of
the BD board.
2. Insert an MO disc (any MO disc available on the market). (Refer
to Note 1.)
3. Press the
) button and move the optical pickup toward
outer circumference of the pit area.
4. Rotate the MULTI JOG knob and let the display “EF MO
CHECK” (03) appear.
5. Press the ENTER/YES button and let the display “EFB =
MO-R” appear.
(The read laser power, the focus servo is turned ON the tracking
servo is turned OFF and the spindle (S) servo is turned ON.)
servo is turned OFF and the spindle (S) servo is turned ON.)
6. Observe waveform on an oscilloscope and confirm that
waveform on an oscilloscope satisfies the specified value. Do
not rotate the MULTI JOG knob at this time.
(Read power traverse check)
not rotate the MULTI JOG knob at this time.
(Read power traverse check)
7. Press the ENTER/YES button and let the display “EFB =
MO-W” appear.
8. Observe waveform on an oscilloscope to confirm that waveform
on an oscilloscope satisfies the specified value. Do not rotate
the MULTI JOG knob at this time.
(Write power traverse check)
the MULTI JOG knob at this time.
(Write power traverse check)
9. Press the ENTER/YES button and let the display “EFB =
MO-P” appear.
The optical pickup moves toward inner circumference of the
pit area. and the servo locks in.
The optical pickup moves toward inner circumference of the
pit area. and the servo locks in.
V : 0.5V/div H : 10ms/div
Input : DC mode
Input : DC mode
TP233 (TEO)
TP416 (VC)
BD board
Oscilloscope
A-B
2(A+B)
VC
A
B
(Traverse waveform)
Specified value : Offset value 10% or less
Offset value (%) =
×
100
A-B
2(A+B)
VC
A
B
(Traverse waveform)
Specified value : Offset value 10% or less
Offset value (%) =
×
100
10. Observe waveform on an oscilloscope to confirm that waveform
on an oscilloscope satisfies the specified value. Do not rotate
the MULTI JOG knob at this time.
the MULTI JOG knob at this time.
11. Press the ENTER/YES button and let the display “EF MO
CHECK” appear. The disc stops rotating automatically.
12. Press the MD
§ button and remove the MO disc.
13. Insert the check disc (MD) TDYS-1.
14. Rotate the MULTI JOG knob and let the display “EF CD
14. Rotate the MULTI JOG knob and let the display “EF CD
CHECK” (04) appear.
15. Press the ENTER/YES button and let the display “EFB =
CD” appear. The servo locks in automatically.
16. Observe waveform on an oscilloscope to confirm that waveform
on an oscilloscope satisfies the specified value. Do not rotate
the MULTI JOG knob at this time.
the MULTI JOG knob at this time.
17. Press the ENTER/YES button and let the display “EF CD
CHECK” appear.
18. Press the MD
§ button and remove the check disk (MD) TDYS-
1.
Note 1 :
If any recorded disc is used for this check, all the data
will be erased during writing into MO.
will be erased during writing into MO.
Note 2 :
If the traverse waveform is difficult to see, connect an
oscilloscope as shown in the following figure so that it
can be seen more clearly.
oscilloscope as shown in the following figure so that it
can be seen more clearly.
A-B
2(A+B)
VC
A
B
(Traverse waveform)
Specified value : Offset value 10% or less
Offset value (%) =
×
100
A-B
2(A+B)
VC
A
B
(Traverse waveform)
Specified value : Offset value 10% or less
Offset value (%) =
×
100
TP233 (TEO)
10pF
TP416 (VC)
330k
Ω
BD board
Oscilloscope
— 46 —
Focus Bias Check
Change the focus bias and check the focus tolerance amount.
Checking Method :
1.
Checking Method :
1.
Load a test disc (MDW-74/AU-1).
2.
Rotate the MULTI JOG knob and display “CPLAY MODE”
(S:30).
(S:30).
3.
Press the ENTER/YES button twice and display “CPLAY
MID”.
MID”.
4.
Press the MENU/NO button when “C =
AD =
” is
displayed.
5.
Rotate the MULTI JOG knob and display “FBIAS
CHECK”(05).
CHECK”(05).
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 220 and ADER is 2.
after [/] indicate ADER, and the 2 digits after [c =] indicate the
focus bias value.
Check that the C1 error is below 220 and ADER is 2.
7.
Press the ENTER/YES button and display “
/
b
=
”.
Check that the C1 error is not below 220 and ADER is 2.
8.
Press the ENTER/YES button and display “
/
a
=
”.
Check that the C1 error is not below 220 and ADER is 2.
9.
Press the MENU/NO button, next press the MD
§ button,
and remove the disc.
C PLAY Check
MO Error Rate Check
MO Error Rate Check
Checking Method :
1.
1.
Load a test disc (MDW-74/AU-1).
2.
Rotate the MULTI JOG knob and display “CPLAY
MODE”(S:30).
MODE”(S:30).
3.
Press the ENTER/YES button twice and display “CPLAY
MID”.
MID”.
4.
“C =
AD =
” is displayed.
5.
Check that C1 error rate is below 80 and ADER is 2.
6.
Press the MENU/NO button, stop playback, press the MD
§
button, and remove the test disc.
CD Error Rate Check
Checking Method :
1.
1.
Load a test disc (MD) TDYS-1.
2.
Rotate the MULTI JOG knob and display “CPLAY MODE”
(S:30).
(S:30).
3.
Press the ENTER/YES button twice and display “CPLAY
MID”.
MID”.
4.
“C =
AD =
” is displayed.
5.
Check that the C1 error rate is below 50.
6.
Press the MENU/NO button, stop playback, press the MD
§
button, and remove the check disc (MD).
Self-Record/Playback Check
The set that is being repaired, creates a continuous record/playback
disc by itself and checks the error rate.
Checking Method :
1. Insert a disc (blank disc) to which data is allowed to be recorded.
2. Rotate the MULTI JOG knob and let the display “CREC
disc by itself and checks the error rate.
Checking Method :
1. Insert a disc (blank disc) to which data is allowed to be recorded.
2. Rotate the MULTI JOG knob and let the display “CREC
MID” (S: 31) appear.
3. Press the ENTER/YES button and let the display “CREC
MID” appear.
4. As recording is started, the message
REC
appears and then
the message changes to “CREC” (@@@@” (@@@@ means
address) indicating that recording is started.
address) indicating that recording is started.
5. About one minute later, press the MENU/NO button to stop
the continuos recording.
6. Rotate the MULTI JOG knob and let the display “CPLAY
MID” (S: 30) appear.
7. Press the ENTER/YES button and let the display “CPLAY
MID” appear.
8. “C =
AD =
” appear.
9. Check that C1 error is 80 or less and AD error is 2 or less.
10. Press the MENU/NO button to stop playing back. Press the
10. Press the MENU/NO button to stop playing back. Press the
MD
§ button and remove the disc.
Initial Setting of Adjustment Value
Note :
This is the mode which sets and returns the adjustment result value
that is recorded in the non-volatile memory, to the initial setting
value. However, the resultant value of the temperature compensation
offset adjustment is not set or not returned to the initial setting value.
If the initial setting is executed, all adjustment steps must be
performed again from the beginning excluding temperature
compensation offset adjustment.
For this initial setting, refer to “Precaution for Adjustment” (Page
43). Perform the initial setting before starting adjustments as
necessitated.
that is recorded in the non-volatile memory, to the initial setting
value. However, the resultant value of the temperature compensation
offset adjustment is not set or not returned to the initial setting value.
If the initial setting is executed, all adjustment steps must be
performed again from the beginning excluding temperature
compensation offset adjustment.
For this initial setting, refer to “Precaution for Adjustment” (Page
43). Perform the initial setting before starting adjustments as
necessitated.
Setting Method :
1. Rotate the MULTI JOG knob and let the display “ADJ
1. Rotate the MULTI JOG knob and let the display “ADJ
CLEAR” (24) ) appear.
2. When the ENTER/YES button is pressed, “Complete!”
appears for a moment and the initial setting is executed. Then
“ADJ CLEAR” appears.
“ADJ CLEAR” appears.
— 47 —
Recording and Display of IOP Information
The IOP data can be recorded in the non-volatile memory. The two
types of IOP data can be recorded in the non-volatile memory. One
is the unique IOP value of the optical pickup that is indicated on the
label of the optical pickup. The other is the IOP value after
completion of adjustment. When you want to check the unique
IOP value of the optical pickup, you need not to turn around the set
to look at the label since the IOP information is recorded in the non-
volatile memory.
types of IOP data can be recorded in the non-volatile memory. One
is the unique IOP value of the optical pickup that is indicated on the
label of the optical pickup. The other is the IOP value after
completion of adjustment. When you want to check the unique
IOP value of the optical pickup, you need not to turn around the set
to look at the label since the IOP information is recorded in the non-
volatile memory.
Recording Method :
1. Rotate MULTI JOG and let the display “[Service]” appear.
1. Rotate MULTI JOG and let the display “[Service]” appear.
Press the ENTER/YES button.
2. Rotate the MULTI JOG knob and let the display “Iop Write”
(28) appear. Press the ENTER/YES button.
3. The display changes to “Ref=@@@@” (@ is an arbitrary
number). The numbers that can be modified, flash.
4. Enter the IOP value that is indicated on the label of the optical
pickup.
To select number: Rotate MULTI JOG .
To select the digit : Press the MD WALKMAN SYNC .
To select number: Rotate MULTI JOG .
To select the digit : Press the MD WALKMAN SYNC .
5. Press the ENTER/YES button and the display changes to
“Measu=@@@.@” (@ is an arbitrary number).
6. The resultant value of adjustment is saved in the non-volatile
memory by simply pressing the ENTER/YES button in this
step 6. Therefore, press the ENTER/YES button without
changing the value on display.
step 6. Therefore, press the ENTER/YES button without
changing the value on display.
7. The message “Complete!” appears for a moment. The values
are saved in the non-volatile memory. The display changes to
“lop Write”.
“lop Write”.
How to Display the IOP Values:
1. Rotate MULTI JOG and let the display “lop Read” (27) appear.
2. “@@.@/##.#” appears and the saved contents are displayed as
1. Rotate MULTI JOG and let the display “lop Read” (27) appear.
2. “@@.@/##.#” appears and the saved contents are displayed as
follows:
@@.@ : Iop value that is indicated on the label of the optical
@@.@ : Iop value that is indicated on the label of the optical
pickup
##.# :
Iop value that is the resultant value of adjustment
3. Press the MENU/NO button to end the display and to show
the message “Iop Read”.
Temperature Compensation Offset Adjustment
Save the temperature data at that time in the non-volatile memory
as 25 ˚C reference data.
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
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 temperature.
Adjusting Method :
1.
1.
Rotate the MULTI JOG knob and display “TEMP ADJUST”.
2.
Press the ENTER/YES button and select the “TEMP
ADJUST” mode.
ADJUST” mode.
3.
“TEMP =
” 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.
When not saving the data, press the MENU/NO button.
5.
When the ENTER/YES button is pressed, “TEMP =
SAV” will be displayed for some time, followed by “TEMP
ADJUST”.
When the MENU/NO button is pressed, “TEMP ADJUST”
will be displayed.
SAV” will be displayed for some time, followed by “TEMP
ADJUST”.
When the MENU/NO button is pressed, “TEMP ADJUST”
will be displayed.
Specifications :
The “TEMP =
” should be within “E0 - EF”, “F0 - FF”, “00 -
0F”, “10 - 1F” and “20 - 2F”.
Laser Power Adjustment
Before starting the adjustment:
Check the IOP value of the optical pickup beforehand. (Refer to
section “ Recording and Display of IOP Information”.)
Check the IOP value of the optical pickup beforehand. (Refer to
section “ Recording and Display of IOP Information”.)
Connection :
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 MULTI JOG knob and display “LDPWR
ADJUST”.
(Laser power : For adjustment)
(Laser power : For adjustment)
3. Press the ENTER/YES button once and let the display “LD
0.9 mW $
” appear.
4. Rotate MULTI JOG until the laser power meter reading is in
the range of 0.85 to 0.91 mW. Select the 10 mW range of the
laser power meter and press the ENTER/YES button to save
the resultant value of adjustment in the non-volatile memory.
(The message “LD SAVE $
laser power meter and press the ENTER/YES button to save
the resultant value of adjustment in the non-volatile memory.
(The message “LD SAVE $
” appears for a moment.)
Optical pickup
objective lens
objective lens
Laser power meter
TP170 (I+3V)
TP169 (IOP)
BD board
Digital voltmeter
— 48 —
5. Then the message “LD 7.0m W$
” appears.
6. Rotate MULTI JOG so that the laser power meter reading is
in the range of 6.9 to 7.1 mW. Press the ENTER/YES button
to save the resultant value of adjustment in the non-volatile
memory. (The message “LD SAVE $
to save the resultant value of adjustment in the non-volatile
memory. (The message “LD SAVE $
” appears for a
moment.)
Note:
Do not continue emission of 7.0 mW for 15 seconds or longer.
7. Rotate MULTI JOG and let the display “LDPWR CHECK”
(02) appear.
8. Press the ENTER/YES button once and let the display “LD
0.9 mW $
” appear.
Check that the laser power meter reading is in the range of 0.85
to 0.91 mW.
to 0.91 mW.
9. Press the ENTER/YES button once and let the display “LD
7.0mW $
” appear.
Check that the laser power meter and digital voltmeter readings
satisfy the specified value. Take note of the digital voltmeter
reading.
satisfy the specified value. Take note of the digital voltmeter
reading.
Specification :
Laser power meter reading : 7.0 ± 0.1 mW
Digital voltmeter reading : The value that is indicated on the label
of the optical pickup ± 10 %
Laser power meter reading : 7.0 ± 0.1 mW
Digital voltmeter reading : The value that is indicated on the label
of the optical pickup ± 10 %
10. Press the MENU/NO button and let the display “LDPWR
CHECK” appear to stop laser emission.
(The MENU/NO button can be accepted at all times to stop
the laser emission.)
(The MENU/NO button can be accepted at all times to stop
the laser emission.)
11. Rotate MULTI JOG and let the display “Iop Write” appear.
12. Press the ENTER/YES button. When the display changes to
12. Press the ENTER/YES button. When the display changes to
“Ref=@@@@” (@ is an arbitrary number), press the ENTER/
YES button and let the message “Measu=@@@.@”. (@ is an
arbitrary number) appear.
YES button and let the message “Measu=@@@.@”. (@ is an
arbitrary number) appear.
13. The numbers that can be modified, flash. Enter the IOP value
that is taken note of in step 9.
To select number: Rotate MULTI JOG .
To select the digit : Press the MD WALKMAN SYNC .
To select number: Rotate MULTI JOG .
To select the digit : Press the MD WALKMAN SYNC .
14. When the ENTER/YES button is pressed, the message
“Complete!” appears for a moment. The values are saved in
the non-volatile memory. The display changes to “lop Write”.
the non-volatile memory. The display changes to “lop Write”.
Note 1:
Every time when the ENTER/YES button is pressed
upon completion of step 9, the display changes in the order
starting from “LD 0.7m W$
upon completion of step 9, the display changes in the order
starting from “LD 0.7m W$
”, “LD 6.2m W$
”,
“LD WP
ホセイ$
” and “LDWP correction $
”.
This is just a display and any operations are not necessary.
Traverse Adjustment
Connection :
Adjusting method :
1. Connect an oscilloscope to TP233 (TEO) and TP416 (VC) of
1. Connect an oscilloscope to TP233 (TEO) and TP416 (VC) of
the BD board.
2. Insert an MO disc (any MO disc available on the market). (Refer
to Note 1.)
3. Press the
) button and move the optical pickup toward
outer circumference of the pit area.
4. Rotate MULTI JOG and let the display “EF MO ADJUST”
(11) appear.
5. Press the ENTER/YES button and let the display “EFB =
MO-R” appear.
(The read laser power is turned on, the focus servo is turned
ON, the tracking servo is turned OFF and the spindle (S) servo
is turned ON.)
(The read laser power is turned on, the focus servo is turned
ON, the tracking servo is turned OFF and the spindle (S) servo
is turned ON.)
6. Rotate the MULTI JOG until the waveform on an oscilloscope
satisfies the specified value. (When the MULTI JOG is rotated,
the numbers
of “EFB =
” changes and the waveform
also changes.) The waveform changes at the step of approx. 2
% in this adjustment. Adjust the waveform until the waveform
becomes as closest as possible to the satisfied value.
(Read power traverse adjustment)
% in this adjustment. Adjust the waveform until the waveform
becomes as closest as possible to the satisfied value.
(Read power traverse adjustment)
7. Press the ENTER/YES button to save the resultant data of
adjustment in the non-volatile memory. (“EFB =
SAVE” is
displayed for a moment. Then “EFB =
MO-W” is displayed.)
8. Rotate the MULTI JOG until the waveform on an oscilloscope
satisfies the specified value. (When the MULTI JOG is rotated,
the numbers
of “EFB =
” changes and the waveform
also changes.) The waveform changes at the step of approx. 2
% in this adjustment. Adjust the waveform until the waveform
becomes as closest as possible to the satisfied value.
(Write power traverse adjustment)
% in this adjustment. Adjust the waveform until the waveform
becomes as closest as possible to the satisfied value.
(Write power traverse adjustment)
9. Press the ENTER/YES button to save the resultant data of
adjustment in the non-volatile memory. (“EFB =
SAVE” is
displayed for a moment.)
KMS
260A
27X40
B0825
B0825
(Label of optical pickup)
For the procedure to check this value,
refer to section “Recording and
Display of IOP Information”.
refer to section “Recording and
Display of IOP Information”.
Iop = 82.5 mA in this example
Iop (mA) = Digital voltmeter reading (mV) / 1(
Iop (mA) = Digital voltmeter reading (mV) / 1(
Ω
)
V : 0.5V/div H : 10ms/div
Input : DC mode
Input : DC mode
TP233 (TEO)
TP416 (VC)
BD board
Oscilloscope
VC
A
B
(Traverse Waveform)
Specification : A = B
VC
A
B
(Traverse Waveform)
Specification : A = B
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