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Verfügbare Sprachen
VC-A30G(BR) VC-A30S(BR)
VC-A30GMI(BR) VC-A30SM(BR)
VC-A30QM(BR) VC-A30SV(BR)
1. Place the unit to the record mode.
2. Feed the colour bar (stair-case waveform) signal
to the video input terminal.
3. Observing the waveform
on the oscilloscope
screen
(external
trigger
at video
output
terminal), take the following steps.
a) Connect the oscilloscope's GND and SIG leads
to TP302 and TP301, respectively.
(For
convenient
connection
of
the
oscilloscope, use QCNW-6443GEZZ.)
b) Turn R208 (recording Y control) to minimum.
c) Adjust R504 (recording chroma control) so
that the red level be 24 + 2mVp-p as shown in
Figure 2-7.
4. Adjust R208 (recording Y control) so that the
sync tip be 140 + 10mVp-p as shown
in Figure
2-8.
24+ 2mVp-p
10mVidiv
10usec/div
50mVidiv
|_| 10psec/div
Figure.2-8.
@ ADJUSTMENT
OF THE Y/C PLAYBACK
CIRCUIT
Adjustment of playback video signal level
Measurin
.
[Mode
[Playback
Tape used
Alignment tape (VROCPSV)
(stair-case waveform)
Fin @ of 20
Adjusting point
R201
(playback level control)
Specification
2.0+0.1Vp-p
1. Insert the alignment tape (stair-case waveform)
and place the unit to the playback mode.
2. Hook up the oscilloscope to pin @ of 1C201.
Adjust R201 (playback level control) so that the
on-screen waveform be 2.0 + 0.1 Vp-p as shown
in Figure 2-9.
36
Figure 2-9.
Adjustment of delay level
Measuring
;
sactetiment
Dual-beam oscilloscope
[wode
| Playback
Tape used
Alignment tape
(VROCPSV)
(Stair-case waveform)
Test point
CH-1; TP204
CH-2; TP205
Adjusting point
R202 (delay level control)
CH-2 level = CH-1 level
1. Insert the alignment tape and play it.
2. Adjust R202 (delay level control) so that the
levels for CH-1 and CH-2 are the same as shown
in Figure 2-10.
eye
CH-2
10psec/div
Figure 2-10.
Adjustment of the APC
[Mode
—laybock =i
Alignment tape (VROCPSV)
(Stair-case waveform)
Adjusting point
R501 (APC control)
Specification
4.433619MHz + 50Hz
1. Insert the alignment tape and place the unit to
the playback mode.
2. Connect the frequency counter to pin @) of CB
connector. Adjust R501 (APC control) so that the
counter reading be 4.433619MHz + 50Hz.
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