VC-M H80
VC-MH90
Figure
5-6
(c).
CHECKING
OF,PLAYBACK
LEVEL
I
Measuring
I
Osci I loscope
instrument
I
Mode
Record/Playback
Input signal
EIA colour bar (1
.OVp-p)
Test point
VIDEO OUT jack
Specification
1.0
+
O.lVp-p
1. Be sure that E-E level has been correctly
specificed.
2. Connect a 75 ohm terminating resistor to the
VIDEO OUT jack and connect an oscilloscope
across this terminating resistor.
(See Note below.)
3. Feed a colour bar signal to the VIDEO IN jack and
set the unit in recording mode.
4. Play the colour bar portion of the recorded tape.
5. Make sure that the output signal amplitude is
1 .OVp-p as shown in Figure
5-7.
Note:
If the 75 ohm terminating resistor is missing, the
signal amplitude will be doubled.
Figure
5-7.
:
ADJUSTMENT OF VCO
Measuring
instrument
Mode
input signal
Test point
Control
Specification
DC volmeter, Monitor TV
Recording or E-E
EIA colour bar (1
.OVp-p)
TP5901
(Sig.), TP5902 (GND)
c5902
2.5
+
0.25Vpp
. .
1. Have the unit receiver a good TV broadcast or
feed a colour bar signal to the VIDEO IN jack.
2. Connect a DC voltmeter to test points
TP5901
(Sig.)
and
TP5902(GND).
3. Press the MODE OSD button on the remote
control so
thatmormal
screen is selected.
4. Adjust
C5902
(VCO control) so that the DC
voltmeter reads
2.5+0.25V
and the on screen
display is shown normally.
Figure
5-8.
40
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