Technicolor - Thomson CDP-CX57 Benutzerhandbuch

– 17 –

1. CD Block is basically designed to operate without adjustment. There-

fore, 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.

11. Turn OFF the power, and remove the lead wire connected at

step 7.

A clear RF signal waveform means that the shape “

◊

” can be

clearly distinguished at the center of the waveform.

Procedure :
1. Press the

I

/

u

button and turn ON the power supply.

2. Open the front cover, and press the 

[PLUS ONE]

 button.

3. Set the disc (YEDS-18) into the “PLUS ONE” slit.
4. Close the front cover, and chuck the disc.
5. Press the

I

/

u

button and turn OFF the power.

6. Connect the oscilloscope to TP (FE) of the BD board.
7. Connect TP (ADJ) of the MAIN board and connect TP (GND)

with a lead wire.

8. Press the

I

/

u

button and turn ON the power.

9. The first track will be played back automatically. When the

[CHECK]

 button is pressed, “S-JI mode” will be displayed on

the fluorescent indicator tube, and focus search will be repeated.

10. Check the oscilloscope waveform (S-curve) is symmetrical be-

tween A and B. And confirm peak to peak level within 1.8 ±
0.6 Vp-p.

11. Turn OFF the power, and remove the lead wire connected at

step 7.

• 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.

Procedure :
1. Press the

I

/

u

button and turn ON the power supply.

2. Open the front cover, and press the [PLUS ONE] button.
3. Set the disc (YEDS-18) into the “PLUS ONE” slit.
4. Close the front cover, and chuck the disc.
5. Press the

I

/

u

button and turn OFF the power.

6. Connect the oscilloscope to TP (RF) of the BD board.
7. Connect TP (ADJ) of the MAIN board and connect TP (GND)

with a lead wire.

8. Press the

I

/

u

button and turn ON the power.

9. Playback the fifth track of the disc.
10. Confirm that oscilloscope waveform is clear and check RF

signal level is correct or not.

The procedure for this checking method differs for when a gen-
eral remote control unit is used and not used.

When a general remote commander is used:
1. Press the

I

/

u

button and turn ON the power supply.

2. Open the front cover, and press the 

[PLUS ONE]

 button.

3. Set the disc (YEDS-18) into the “PLUS ONE” slit.
4. Close the front cover, and chuck the disc.
5. Press the

I

/

u

button and turn OFF the power.

6. Connect the oscilloscope to TP (TE) of the BD board.
7. Connect TP (ADJ) of the MAIN board and connect TP (GND)

with a lead wire.

8. Press the

I

/

u

button and turn ON the power.

9. Playback the fifth track of the disc.
10. Press the 

[3]

 button on the remote commander. (The tracking

servo and the sledding servo are turned OFF.)

11. Check the level B of the oscilliscope's waveform and the A

(DC voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than ± 10%

BD board

TP (FE)

TP (VC)

+
–

oscilloscope

symmetry

S-curve waveform

within 1.8 

±

 0.6 Vp-p

A

B

BD board

TP (RF)

TP (VC)

+
–

oscilloscope

(AC range)

level: 1.8      Vp-p

+0.3
–0.2

VOLT/DIV : 200 mV
TIME/DIV : 500 ns

RF signal waveform

BD board

TP (TE)

TP (VC)

+
–

oscilloscope

Center of the 
waveform

Traverse waveform

B

A (DC voltage)

0 V

level: 0.9 

±

 0.45 Vp-p

Traverse waveform

C (DC 
voltage)

0 V

Tracking servo
Sled servo
         OFF

Tracking servo
Sled servo
           ON

12. Press the 

[8]

 button on the remote control unit. (The tracking

servo and sledding servo are turned ON.) Confirm the C (DC
voltage) is almost equal to the A (DC voltage) is step 11.

13. Turn OFF the power, and remove the lead wire connected at

step 7.