Sharp VC-MH80 Service Manual page 40

CHECKING OF,PLAYBACK LEVEL
Osci I loscope
Measuring
instrument
I
Mode Record/Playback
EIA colour bar (1 .OVp-p)
Input signal
VIDEO OUT jack
Test point
1.0 + O.lVp-p
Specification
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.
ADJUSTMENT OF VCO
Measuring
instrument
I
Mode
input signal
Test point
Control
Specification
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
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.
40
DC volmeter, Monitor TV
Recording or E-E
EIA colour bar (1 .OVp-p)
2.5 + 0.25Vpp
. .