Sony HCD-MD555 Service Manual ▷ View online
— 49 —
10. “EFB =
MO-P” appears.
The optical pickup moves toward inner circumference of the
pit area. and the servo locks in.
pit area. and the servo locks in.
11. Rotate MULTI JOG . 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.
waveform becomes as closest as possible to the satisfied value.
12. 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 “EF MO ADJUST” is displayed. The disc stops rotating
automatically.
Then “EF MO ADJUST” is displayed. The disc stops rotating
automatically.
13. Press the MO
§ button and remove the MO disc.
14. Insert the check disc (MD) TDYS-1.
15. Rotate MULTI JOG and let the display “EF CD ADJUST”
15. Rotate MULTI JOG and let the display “EF CD ADJUST”
(12) appear.
16. Press the ENTER/YES button and let the display “EFB =
CD” appear. The servo locks in automatically.
17. Rotate MULTI JOG . 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.
waveform becomes as closest as possible to the satisfied value.
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 ADJUST” is displayed.
memory.
Next “EF CD ADJUST” is displayed.
19. Press the MD
§ button and remove the check disc (MD)
TDYS-1.
Note 1 :
Data will be erased during MO reading if a recorded disc
is used in this adjustment.
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.
oscilloscope as shown in the following figure so that it
can be seen more clearly.
VC
A
B
(Traverse Waveform)
Specification : A = B
VC
A
B
(Traverse Waveform)
Specification : A = B
TP233 (TEO)
10pF
TP416 (VC)
330k
Ω
BD board
Oscilloscope
Focus Bias Adjustment
Adjusting Method :
1. Load a test disc (MDW-74/AU-1).
2. Rotate the MULTI JOG knob and display “CPLAY MODE
1. Load a test disc (MDW-74/AU-1).
2. Rotate the MULTI JOG knob and display “CPLAY MODE
”(29).
3. Press the ENTER/YES button twice and display “CPLAY
MID”.
4. Press the MENU/NO button when “C =
AD =
” is
displayed.
5. Rotate the MULTI JOG knob and display “FBIAS ADJUST”
(13).
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 MULTI JOG knob in the clockwise direction and
find the focus bias value at which the C1 error rate becomes
220. (Refer to Note 2.)
220. (Refer to Note 2.)
8. Press the ENTER/YES button and display “
/
b
=
”.
9. Rotate the MULTI 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 50 and ADER is 00. Then
press the ENTER/YES button.
12. If the “(
” in “
-
-
(
” is above 20, press the YES
button.
If below 20, press the MENU/NO button and repeat the
adjustment from step 2 again.
If below 20, press the MENU/NO button and repeat the
adjustment from step 2 again.
13. Press the MD
§ 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.
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.
Note 2 :
As the C1 error rate changes, perform the adjustment
using the average value.
using the average value.
C1 error
Focus bias value
(F. BIAS)
(F. BIAS)
b
c
a
Approx.
220
220
— 50 —
Error Rate Check
CD Error Rate Check
Checking Method :
1. Load a check disc (MD) TDYS-1.
2. Rotate the MULTI JOG knob and display “CPLAY MODE”
1. Load a check disc (MD) TDYS-1.
2. Rotate the MULTI JOG knob and display “CPLAY MODE”
(30).
3. Press the ENTER/YES button twice and display “CPLAY
MID”.
4. “C =
AD =
” is displayed.
5. Check that the C1 error rate is below 20.
6. Press the MENU/NO button, stop playback, press the MD
6. Press the MENU/NO button, stop playback, press the MD
§
button, and remove the check disc (MD).
MO Error Rate Check
Checking Method :
1. Load a test disc (MDW-74/AU-1).
2. Rotate the MULTI JOG knob and display “CPLAY MODE”
1. Load a test disc (MDW-74/AU-1).
2. Rotate the MULTI JOG knob and display “CPLAY MODE”
(30).
3. Press the ENTER/YES button twice and display “CPLAY
MID”.
4. “C =
AD =
” is displayed.
5. If the C1 error rate is below 50, check that ADER is 2.
6. Press the MENU/NO button, stop playback, press the MD
6. Press the MENU/NO button, stop playback, press the MD
§
button, and remove the test disc.
Focus Bias Check
Change the focus bias and check the focus tolerance amount.
Checking Method :
1. Load a test disc (MDW-74/AU-1).
2. Rotate the MULTI JOG knob and display “CPLAY MODE”
Checking Method :
1. Load a test disc (MDW-74/AU-1).
2. Rotate the MULTI JOG knob and display “CPLAY MODE”
(30).
3. Press the ENTER/YES button twice and display “CPLAY
MID”.
4. Press the MENU/NO button when “C =
AD =
” is
displayed.
5. Rotate the MULTI JOG knob and display “FBIAS 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 50 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 50 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 below 220 and ADER is 2.
9. Press the MENU/NO button, next press the MD
§ button,
and remove the continuously recorded disc.
Note 1 :
If the C1 error and ADER are above 00 at points a (step
8.) or b (step 7.), the focus bias adjustment may not have
been carried out properly. Adjust perform the beginning
again.
8.) or b (step 7.), the focus bias adjustment may not have
been carried out properly. Adjust perform the beginning
again.
Auto Gain Control Output Level Adjustment
Be sure to perform this adjustment when the pickup is replaced.
If the adjustment ends in the message “Adjust NG!”, it is suspected
that the optical pickup is defective or the servo system circuit is
defective.
If the adjustment ends in the message “Adjust NG!”, it is suspected
that the optical pickup is defective or the servo system circuit is
defective.
CD Auto Gain Control Output Level Adjustment
Adjusting Method :
1. Insert the check disc (MD) TDYS-1.
2. Rotate MULTI JOG and let the display “AG Set (CD)” (26)
1. Insert the check disc (MD) TDYS-1.
2. Rotate MULTI JOG and let the display “AG Set (CD)” (26)
appear.
3. When the ENTER/YES button is pressed, the adjustment is
performed automatically and result of the adjustment is saved
in the non-volatile memory. After the adjustment result is saved
in the non-volatile memory, “Complete!” appears and then “AG
Set (CD)” is displayed indicating that the adjustment is complete.
in the non-volatile memory. After the adjustment result is saved
in the non-volatile memory, “Complete!” appears and then “AG
Set (CD)” is displayed indicating that the adjustment is complete.
4. Press the MD
§ button and remove the MO disc.
MO Auto Gain Control Output Level Adjustment
Adjusting Method :
1. Insert the recording reference disc (MDW-74/AU-1).
2. Rotate MULTI JOG and let the display “AG Set (MO)” (25)
1. Insert the recording reference disc (MDW-74/AU-1).
2. Rotate MULTI JOG and let the display “AG Set (MO)” (25)
appear.
3. When the ENTER/YES button is pressed, the adjustment is
performed automatically and result of the adjustment is saved
in the non-volatile memory. After the adjustment result is saved
in the non-volatile memory, “Complete!” appears and then “AG
Set (MO)” is displayed indicating that the adjustment is
complete.
in the non-volatile memory. After the adjustment result is saved
in the non-volatile memory, “Complete!” appears and then “AG
Set (MO)” is displayed indicating that the adjustment is
complete.
4. Press the MD
§ button and remove the MO disc.
— 51 —
Note:
A clear RF signal waveform means that the shape “
◊
” can
be clearly distinguished at the center of the waveform.
RF signal waveform
E-F Balance (Traverse) Check
1. Solder the lead wire to TP308 (ADJ) on MAIN board.
2. Connect oscilloscope to test point TP (TE) on SERVO board.
3. Turn the
2. Connect oscilloscope to test point TP (TE) on SERVO board.
3. Turn the
U (power) switch on to set the ADJ mode.
4. Set the function switch to the CD position.
5. Connect the lead wire to ground, that is connected in step 1.
6. Insert the disc (YEDS-18) and start playing back.
7. Press the DISPLAY button. (Tracking servo and sled servo
5. Connect the lead wire to ground, that is connected in step 1.
6. Insert the disc (YEDS-18) and start playing back.
7. Press the DISPLAY button. (Tracking servo and sled servo
are turned OFF.)
8. Check the level B of the oscilloscope's waveform and the A
(DC voltage) of the center of the Traverse waveform.
Confirm the following :
A/B
Confirm the following :
A/B
×
100 = less than ± 22%
9. Press the DISPLAY button. (The tracking servo and sledding
servo are turned ON.) Confirm the C (DC voltage) is almost
equal to the A (DC voltage) is step 8.
equal to the A (DC voltage) is step 8.
10. Disconnect the lead wire of TP308 (ADJ) connected in step 1.
Note:
1.
CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
Therefore, check each item in order given.
2.
Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3.
Use an oscilloscope with more than 10M
Ω
impedance.
4.
Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.
when the signal level is low than specified value with the
following checks.
S Curve Check
Procedure :
1. Connect oscilloscope to test point TP (FEO) on SERVO board.
2. Connect between test point TP (FEI) and TP (VC) by lead wire.
3. Connect TP (AGCON) to ground by lead wire.
4. Turn
1. Connect oscilloscope to test point TP (FEO) on SERVO board.
2. Connect between test point TP (FEI) and TP (VC) by lead wire.
3. Connect TP (AGCON) to ground by lead wire.
4. Turn
U (power) switch on.
5. Put disc (YEDS-18) in and turn
U (power) switch on again
and actuate the focus search. (actuate the focus search when
disc table is moving in and out.)
disc table is moving in and out.)
6. Check the symmetry of the oscilloscope waveform (S-curve)
and the level (p-p value).
7. After check, remove the lead wire TP (FOK) connected in step
2.
Note :
Try to measure several times to make sure than the ratio of
A : B or B : A is more than 10 : 7. (Take sweep time as long
as possible and light up the brightness to obtain best
waveform.)
A : B or B : A is more than 10 : 7. (Take sweep time as long
as possible and light up the brightness to obtain best
waveform.)
RF Level Check
Procedure :
1. Connect oscilloscope to test point TP (RF).
2. Turn
1. Connect oscilloscope to test point TP (RF).
2. Turn
U (power) switch on.
3. Put disc (YEDS-18) in to play.
4. Confirm that oscilloscope waveform is clear and check RF signal
4. Confirm that oscilloscope waveform is clear and check RF signal
level is correct or not.
CD SECTION
TP (FEO)
BD board
TP (VC)
oscilloscope
A
B
symmetry
level 2.4
±
0.7Vp-p
TP (RF)
BD board
TP (VC)
oscilloscope
VOLT/DIV : 200mV
TIME/DIV : 500ns
TIME/DIV : 500ns
level: 1.2
±
0.2 Vp-p
TP (FEO)
BD board
TP (VC)
oscilloscope
0V
B
A (DC voltage)
level: 1.3
±
0.6Vp-p
Traverse waveform
Center of the waveform
0V
C (DC voltage)
Traverse waveform
Tracking servo
Sledding servo
Sledding servo
OFF
Tracking servo
Sledding servo
Sledding servo
ON
— 52 —
Check Location :
[BD (CD) Board] (Side A)
[BD (MD) Board] (Side A)
[MAIN Board]
[BD (MD) Board] (Side B)
TP
(VC)
TP
(AGCCON)
TP(VC)
TP(FEI)
TP
(TEO)
TP
(FEO)
TP
(RF)
IC102
IC101
IC103
IC302
IC300
IC100
CN300
TP308
IC316
TP169
TP170
TP233
IC121
IC124
IC101
D101
CN101
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