DOWNLOAD Sony MDS-B6P Service Manual ↓ Size: 1.12 MB | Pages: 58 in PDF or view online for FREE

— 33 —

Note : The erasing-protection tab is not detected during the test mode. Recording will start regardless of the position of the erasing-protection

tab when the 

r (REC) button is pressed.

Contents

Sets continuous playback when pressed in the STOP state. When pressed during continuous playback, the tracking servo turns ON/OFF.

Stops continuous playback.

The sled moves to the outer circumference only when this is pressed.

The sled moves to the inner circumference only when this is pressed.

Switches between the pit and groove modes when pressed.

Switches the spindle servo mode (CLVS and A).

Switches the display when pressed.Returns to previous step. Stops operations.

Function

^

p

)

0

SINGLE

A. MODE

DISPLAY

Each time the DISPLAY button is pressed, the display changes in the following order.
MODE display

nError rate displaynAddress display

1. MODE display

Displays “TEMP ADJUST”, “CPLAY MODE”, etc.

2. Error rate display

Error rates are displayed as follows.
C1 = 

AD = 

C1 = : Indicates C1 error
AD = : Indicates ADER

3. Address display

Addresses are displayed as follows.
h = 

s = 

 (MO pit and CD)

h = 

a = 

 (MO groove)

h = : Header address
s = : SUBQ address
a = : ADIP address
* is displayed when the address cannot be read.

During continuous playback

Tracking servo OFF

CLV LOCK

Pit

High reflection

CLV-S

ABCD adjustment completed

STOP

Tracking servo ON

CLV UNLOCK

Groove

Low reflection

CLV-A

Display

Contents

Light

Off

Blinking

^ LED

e LED

SYNC

TRACK

DISC

SPEED

A. PAUSE

REPEAT 1

Focus auto gain successful
Tracking auto gain failed

1 As loading related operations will be performed regardless of the test mode operations being performed, be sure to check that the disc is

stopped before setting and removing it.
Even if the EJECT button is pressed while the disc is rotating during continuous playback, the disc will not stop rotating.
Therefore, it will be ejected while rotating.
Always press the EDIT/NO button first before pressing the EJECT button.

2 Most buttons can not be used while the error rate is displayed due to bugs of IC121 CXD2535CR.

Focus auto gain successful
Tracking auto gain failed

— 34 —

To check the emission of the laser diode during adjustments, never
view directly from the top as this may lose your eye-sight.

As the laser diode in the optical pick-up is easily damaged by static
electricity, solder the laser tap of the flexible board when using it.
Before disconnecting the connector, desolder first. Before connect-
ing the connector, be careful not to remove the solder. Also take ad-
equate measures to prevent damage by static electricity. Handle the
flexible board with care as it breaks easily.

1) When replacing the following parts, perform the adjustments and

checks with 

® in the order shown in the following table.

Optical

Pick-up

BD Board

G

®

®

®

®

®

®

®

®

®

®

G

G

G

®

®

®

®

®

1. Temperature

compensation
offset adjustment

2. Laser power

adjustment

3. Traverse

adjustment

4. Focus bias

adjustment

5. Error rate check

IC171

IC101, IC121, IC191

D101

G

2) Set the test mode when performing adjustments.

After completing the adjustments, exit the test mode.

3) Perform the adjustments in the order shown.
4) Use the following tools and measuring devices.

• MD test disc (CD) MDW-74/AU-1 (Parts No. 8-892-341-41)
• MD test disc TDYS-1

(Parts No. 4-963-646-01)

• Laser power meter LPM-8001

(Parts No. J-2501-046-A)

• Oscilloscope
• Digital voltmeter
• Thermometer

5) When observing several signals on the oscilloscope, etc.,

make sure that VC and GND do not connect inside the oscillo-
scope.
(VC and GND will become short-circuited.)

laser tap

— 35 —

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 tem-
perature.

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

temperature of this part has become the ambient temperature.

Adjusting Method :
1. Rotate the AMS knob and display “TEMP ADJUST”.
2. Press the ENTER/YES button and select the “TEMP 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 EDIT/NO button.

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

 SAVE”

will be displayed for some time, followed by “TEMP ADJUST”.
When the EDIT/NO button is pressed, “TEMP ADJUST” will be
displayed.

The “TEMP =  

” should be within “E0 - EF”, “F0 - FF”, “00 - 0F”,

“10 - 1F” and “20 - 2F”.

+0.1
–0

Laser power
meter

Optical pick-up
objective lens

Digital voltmeter

KMS

210A

27X40
B0825

n

lop = 82.5 mA in this case
lop (mA) = Digital voltmeter reading (mV)/ 1 (

Ω

)

7. Press the ENTER/YES button and display “LD $ 0F = 0.7 mW”.

(Laser power: MO reading)

8. Check that the laser power meter at this time satisfies the speci-

fied value.

Laser power meter reading : 0.70 ± 0.1 mW

9. Press the EDIT/NO button and display “LDPWR ADJUST’, and

stop laser emission.
(The EDIT/NO button is effective at all times to stop the laser
emission.)

BD board
TP (I + 5V)
TP (IOP)

Adjusting Method :
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 AMS knob and display “LDPWRADJUST”.

(Laser power : For adjustment)

3. Press the ENTER/YES button twice and display “LD $ 4B = 3.5

mW”.

4. Adjust RV102 of the BD board so that the reading of the laser

power meter becomes 3.4

 mW.

5. Press the ENTER/YES button and display “LD $ 96 = 7.0 mW”.

(Laser power:MO reading)

6. Check that the laser power meter and digital voltmeter readings

satisfy the specified value.

Laser power meter reading : 7.0 ± 0.3 mW
Digital voltmeter reading : Optical pick-up displayed value ± 10%

(Optical pick-up label)

— 36 —

11. Rotate the AMS knob until the waveform of the oscilloscope

moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 3%.
Adjust the waveform so that the specified value is satisfied as
much as possible.

(Traverse Waveform)

Oscilloscope

BD board
TP (TEO)
TP (VC)

Adjusting method :
1. Connect an oscilloscope to TP (TEO) and TP (VC) of the BD

board.

2. Load a MO disc (any available on the market).
3. Press the 

0 button or ) button and move the optical pick-up

outside the pit.

4. Rotate the AMS knob and display “EFBAL ADJUST”.
5. Press the ENTER/YES button and display “EFBAL MO-W”.

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

6. Adjust RV101 of the BD board so that the waveform of the oscil-

loscope becomes the specified value.
(MO groove write power traverse adjustment)

(Traverse Waveform)

VC

A

B

VC

A

B

Specification A = B

7. Press the ENTER/YES button and display “EFB = $   MO-R”.

(Laser power : MO reading)

8. Rotate the AMS knob so that the waveform of the oscilloscope

becomes the specified value.
(When the AMS knob is rotated, the   of “EFB-   ” changes and
the waveform changes.) In this adjustment, waveform varies at
intervals of approx. 3%. Adjust the waveform so that the speci-
fied value is satisfied as much as possible.
(MO groove read power traverse adjustment)

(Traverse Waveform)

VC

A

B

Specification A = B

9. Press the ENTER/YES button, display “EFB = $   SAVE” for a

moment and save the adjustment results in the non-volatile
memory.
Next “EFBAL MO-P” is displayed.

10. Press the ENTER/YES button and display “EFB = $   MO-P”.

The optical pick-up moves to the pit area automatically and servo
is imposed.

Specification A = B

VC

A

B

12. Press the ENTER/YES button, display “EFB =   SAVE” for a

moment and save the adjustment results in the non-volatile
memory.
Next “EFBAL CD” is displayed. The disc stops rotating auto-
matically.

13. Press the EJECT button and remove the MO disc.
14. Load the test disc TDYS-1.
15. Press the ENTER/YES button and display “EFB =   CD”. Servo

is imposed automatically.

16. Rotate the AMS knob so that the waveform of the oscilloscope

moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 3%.
Adjust the waveform so that the specified value is satisfied as
much as possible.

(Traverse Waveform)

Specification A = B

17. Press the ENTER/YES button, display “EFB = $   SAVE” for a

moment and save the adjustment results in the non-volatile
memory.
Next “EFBAL ADJUST” is displayed.

18. Press the EJECT button and remove the test disc TDYS-1.

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.

Oscilloscope

330k

Ω

10pF

TP (TEO)

TP (VC)