Sony HCD-V5900 Service Manual page 17

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.
set
J9001 (VIDEO OUT)
B
A
C
A = 0.9 to 1.1 Vp-p
B = 0.678 to 0.75 Vp-p
C = 0.214 to 0.328 Vp-p
Fig. 1 Video CD Color Bar Signal Output from J9001
(VIDEO OUT)
[VIDEO BOARD] (SIDE-B)
SL703
SL702
IC251
IC751
SL701
oscilloscope
+
75 Ω
–
H
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 solder.
4. Press the · button in playback.
5. Press 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.
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