DOWNLOAD Sony HCD-ZX50MD Service Manual ↓ Size: 11.08 MB | Pages: 127 in PDF or view online for FREE

45

Checking Procedure :
1. Load a continuously recorded test disc (MDW-74/GA-1).

(Refer to “6-5. Using the Continuously Recorded Disc”.)

2. Move the multi-stick and display “CPLAY1MODE”(C34).
3. Press the  PUSH ENTER  button and display “CPLAY1MID”.
4. The display changes to “C1 = 

 AD = 

”.

5. If the C1 error rate is below 20, check that ADER is 00.
6. Press the  CLEAR  button while REC IT is lit, stop playback,

press the  MD Z  button while REC IT is off, and test disc.

Checking Procedure :
1. Load a check disc (MD) TDYS-1.
2. Move the multi-stick and display “CPLAY1MODE”(C34).
3. Press the  PUSH ENTER  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  CLEAR  button while REC IT is lit, stop playback,

press the  MD Z  button while REC IT is off, and the test disc.

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. Move the multi-stick to display “CREC 1MODE”(C35).
3. Press the  PUSH ENTER  button to display the “CREC 1MID”.
4. When recording starts, “  

  ” is displayed, this becomes

“CREC (@@@@)” (@@@@ is the address), and recording
starts.

5. About 1 minute later, press the  CLEAR  button to stop continu-

ous recording while REC IT is lit.

6. Move the multi-stick to display “CPLAY1MODE”(C34).
7. Press the  PUSH ENTER  button to display “CPLAY1MID”.
8. “C1 = 

 AD = 

” will be displayed.

9. Check that the C1 error becomes below 20 and the AD error

below 2.

10. Press the  CLEAR  button to stop playback while REC IT is lit,

and press the  MD Z  button while REC IT is off and remove
the disc.

Ω

4

6

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 “6-5. Using the Continuously Recorded Disc”.)

2. Move the multi-stick and display “CPLAY1MODE”(C34).
3. Press the  PUSH ENTER  button and display “CPLAY1MID”.
4. Press the  CLEAR  button while REC IT is lit when “C = 

AD = 

” is displayed.

5. Move the multi-stick and display “FBIAS CHECK”(C16).
6. Press the  PUSH ENTER  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.

7. Press the  PUSH ENTER  button and display “ 

/

 b = 

”.

Check that the C1 error is below 100 and ADER is below 2.

8. Press the  PUSH ENTER  button and display “ 

/

 a = 

”.

Check that the C1 error is below 100 and ADER is below 2.

9. Press the  CLEAR  button while REC IT is lit, next press the

MD Z  button while REC IT is off, and remove the test disc.

16. Observe the waveform of the oscilloscope, and check that the

specified value is satisfied. Do not move the Multi stick.

(Traverse Waveform)

17. Press the  PUSH ENTER  button and display “EF CD CHECK”

(C15).

18. Press the  MD Z  button while REC IT is off 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.

IA – BI

46

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 “6-4. Precautions on Ad-
justments” and execute the initial setting before the adjustment as
required.

Setting Procedure :
1. Move the multi-stick to display “ADJ CLEAR” (C28).
2. Press the  PUSH ENTER  button. “Complete!” will be displayed

momentarily and initial setting will be executed, after which “ADJ
CLEAR” (C28) will be displayed.

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.

Recording Procedure :
1. Move the multi-stick to display “Iop Write” (C05), and press the

PUSH ENTER  button.

2. The display becomes Ref=@@@.@ (@ is an arbitrary number)

and the numbers which can be changed will blink.

3. Input the Iop value written on the optical pick-up.

To select the number : Move the multi-stick.
To select the digit : Press the  MD REC MODE  button while

REC IT is lit.

4. When the  PUSH ENTER  button is pressed, the display be-

comes “Measu=@@@.@” (@ is an arbitrary number).

5. As the adjustment results are recorded for the 6 value. Leave it

as it is and press the  PUSH ENTER  button.

6. “Complete!” will be displayed momentarily. The value will be

recorded in the non-volatile memory and the display will be-
come “Iop Write” (C05).

Display Procedure :
1. Move the multi-stick to display “Iop Read”(C26).
2. Press the PUSH ENTER button.
2. “@@.@/##.#” is displayed and the recorded contents are dis-

played.
@@.@ indicates the Iop value labeled on the pick-up.
##.# indicates the Iop value after adjustment

3. To end, press the  CLEAR  button while REC IT is lit, or press

the  MD REC MODE  button while REC IT is lit and display
“Iop Read” (C26).

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

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.

3. When D101 has been replaced, perform this adjustment after

the temperature of this part has become the ambient tempera-
ture.

1

2

Adjusting Procedure :
1. Move the multi-stick and display “TEMP ADJUS” (C03).
2. Press the  PUSH ENTER  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  PUSH ENTER  button.

When not saving the data, press the  CLEAR  button while REC
IT is lit.

5. When the  PUSH ENTER  button is pressed, “TEMP = 

 SAVE”

will be displayed and turned back to “TEMP ADJUS” (C03)
display then. Pressing the  CLEAR  button while REC IT is lit
displays “TEMP ADJUS” (C03) immediately.

The “TEMP =  

” should be within “E0 - EF”, “F0 - FF”, “00 -

0F”,  “10 - 1F” and “20 - 2F”.

Check the Iop value of the optical pick-up before adjustments.
(Refer to 6-8. Recording and Displaying Iop Information.)

Connection :
Adjusting Procedure :
1. Set the laser power meter on the objective lens of the optical

pick-up. (When it cannot be set properly,press the m  or M
button while REC IT is off and move the optical pick-up.)
Connect the digital volt meter to CN105 pin 1 (I+3V) and
CN105 pin 2 (IOP).

2. Move the multi-stick and display “LDPWR ADJUS” (C04).

(Laser power : For adjustment)

3. Press the  PUSH ENTER  button once and display “LD 0.9 mW

$ 

”.

4. Move the multi-stick so that the reading of the laser power meter

becomes 0.85 to 0.91 mW. Press the  PUSH ENTER  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. Move the multi-stick so that the reading of the laser power meter

becomes 6.9 to 7.1 mW, press the  PUSH ENTER  button and
save it.

Note : Do not perform the emission with 7.0 mW more than 15

seconds continuously.

47

KMS

260B

20101
H0576

Iop = 57.6 mA in this case
Iop (mA) = Digital voltmeter reading (mV)/1 (

Ω

)

7. Then, move the multi-stick and display “LDPWR CHECK”

(C13).

8. Press the  PUSH ENTER  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  PUSH ENTER  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.

Laser power meter reading : 7.0 ± 0.1 mW
Digital voltmeter reading : Optical pick-up displayed value ± 10%

(Optical pick-up label)

10. Press the  CLEAR  button while REC IT is lit and display

“LDPWR CHECK” (C13) and stop the laser emission.
(The  CLEAR  button is effective at all times to stop the laser
emission.)

11. Move the multi-stick to display “Iop Write”(C05).
12. Press the  PUSH ENTER  button. When the display becomes

Ref=@@@.@ (@ is an arbitrary number), press the  PUSH
ENTER  button to display “Measu=@@@.@” (@ is an arbi-
trary number).

13. The numbers which can be changed will blink. Input the Iop

value noted down at step 9.
To select the number : Move the multi-stick.
To select the digit : Press the  MD REC MODE  button while

REC IT is lit.

14. When the  PUSH ENTER  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).

Note 1: After step 4, each time the  PUSH ENTER  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 “6-8. Recording and
Displaying the IOP Information”.)

Adjusting Procedure :
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  or M  button while REC IT is off and move the

optical pick-up outside the pit.

4. Move the multi-stick and display “EF MO ADJUS” (C14).
5. Press the  PUSH ENTER  button and display “EFB = 

 MO-R”.

(Laser power READ power/Focus servo ON/tracking servo OFF/
spindle (S) servo ON)

6. Move the multi-stick so that the waveform of the oscilloscope

becomes the specified value.
(When the Multi sitck is moved, the 

 of “EFB= 

” changes

and the waveform changes.) In this adjustment, waveform var-
ies 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  PUSH ENTER  button and save the result of adjust-

ment to the non-volatile memory (“EFB = 

 SAVE” will be

displayed for a moment. Then “EFB = 

 MO-W” will be dis-

played).

8. Move the multi-stick so that the waveform of the oscilloscope

becomes the specified value.
(When the Multi stick is moved, the 

 of “EFB- 

 MO-W”

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.
(Write power traverse adjustment)

(Traverse Waveform)

9. Press the  PUSH ENTER  button, and save the adjustment re-

sults 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.

4

6

R

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. Move the multi-stick to display “Iop NV Save” (C06).
2. Press the  PUSH ENTER  button and display “Iop [stop]”.
3. After the display changes to “Iop =xxsave?”, press the  PUSH

ENTER  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  PUSH

ENTER  button.

6. When “Complete!” is displayed, it means that Iop NV saving

has been completed.

48

11. Move the multi-stick 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.

(Traverse Waveform)

12. Press the  PUSH ENTER  button, and save the adjustment re-

sults in the non-volatile memory. (“EFB = 

 SAVE” will be

displayed for a moment.)
Next “EF MO ADJUS” (C07) is displayed. The disc stops ro-
tating automatically.

13. Press the  MD Z  button while REC IT is off and remove the

disc.

14. Load the check disc (MD) TDYS-1.
15. Move the multi-stick and display “EF CD ADJUS” (C08).
16. Press the  PUSH ENTER  button and display “EFB = 

 CD”.

Servo is imposed automatically.

17. Move the multi-stick 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.

(Traverse Waveform)

18. Press the  PUSH ENTER  button, display “EFB = 

 SAVE”

for a moment and save the adjustment results in the non-vola-
tile memory.
Next “EF CD ADJUS” (C08) will be displayed.

19. Press the  MD Z  button while REC IT is off 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.

Adjusting Procedure :
1. Load a test disk (MDW-74/GA-1).
2. Move the multi-stick and display “CPLAY1MODE”(C34).
3. Press the  PUSH ENTER  button and display “CPLAY1MID”.
4. Press the  CLEAR  button while REC IT is lit when “C1 = 

AD = 

” is displayed.

5. Move the multi-stick and display “FBIAS ADJUS”(C09).
6. Press the  PUSH ENTER  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.

7. Move the multi-stick in the right direction and find the focus

bias value at which the C1 error rate becomes 220 (Refer to
Note 2).

8. Press the  PUSH ENTER  button and display “ 

/

 b = 

”.

9. Move the multi-stick in the left direction and find the focus bias

value at which the C1 error rate becomes 220.

10. Press the  PUSH ENTER  button and display “ 

/

 c =

”.

11. Check that the C1 error rate is below 20 and ADER is 00. Then

press the  PUSH ENTER  button.

12. If the “(

” in “

 - 

 - 

 (

” is above 20, press the  PUSH

ENTER  button.
If below 20, press the  CLEAR  button while REC IT is lit and
repeat the adjustment from step 2.

13. Press the  MD Z  button while REC IT is off and 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.

Note 2 : As the C1 error rate changes, perform the adjustment us-

ing the average vale.

Ω

4

6