HCD-V4800, LBT-V4800, LBT-V4800R - Sony Audio Service Manual (repair manual). Page 17

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VIDEO CD COLOR BAR MODE
On this mode, the data of the color bar signal as a picture signal
and the 1 kHz sine wave signal as a sound signal are output by the
mechanism controller (IC701) for the video CD signal check.
When measurement of the voltage and waveform on the VIDEO
board, perform it in this mode.
For reference, the color bar signal can be observed at J9001
(VIDEO OUT) and the sound signal can be observed at J101
(VIDEO (AUDIO) OUT) using an oscilloscope.
Procedure:
1. Turned power switch on.
2. Press the  FUNCTION  button to select the CD.
3. Connect the SL701 on the VIDEO board with solder.
4. After measuring, remove the soldering installed.

+
–

oscilloscope

75 

Ω

set

J9001 (VIDEO OUT)

B

H

C

A

A = 0.9 to 1.1 Vp-p
B = 0.678 to 0.75 Vp-p
C = 0.214 to 0.328 Vp-p

 (SIDE-B)

E-F BALANCE MODE
Refer to the SECTION 6 ELECTRICAL ADJUSTMENTS page
21.
Procedure:
1. Turned power switch on.
2. Press the  FUNCTION  button to select the CD.
3. Connect the SL701 and SL703 on the VIDEO board with sol-

der.

4. Press the  

· button in playback.

5. Every pressing the  REPEAT  button, the tracking servo and

sledding servo are turned on or off.

6. When the servo is off, the counter on front panel will not be

changed.

7. After measuring, remove the soldering installed.

SL702

SL701

IC751

SL703

IC251