GE 4PE350A3 Instructions Manual page 41

COLOR CAMERA
EBI-6351
Timng and Calibration Generator
Board, PL -7674517
Refer to Figs. 26 through 30.
CALIBRATION PULSE OUTPUT
1. Check for horizontal blanking at TP-3.
It
should be approximately 4.0 volts peak -
to -peak.
2. Check the calibration sawtooth at TEST
POINT TP-1. It should be adjustable from
0.4 volt to 1.0 volt peak -to -peak, using the
CALIB ADJ control, R10.
3. Turn the CALibrate switch on the local
Camera control panel ON.
4. Set the amplitude of the calibration saw -
tooth to 0.7 volt peak -to -peak.
5. Using an oscilloscope, check the ampli-
tude of the calibration pulse at the following
points:
Output
Test Point
Amplitude
White
Red
Blue
Green
J1-14 0.70 v p -p, t 1%
J1 -R
0.24 v p -p, t 1%
J1 -P 0.24 v p -p, t 1%
J1-13
0.24 v p -p, t 1%
SQUASH PULSE AND POWER SUPPLY TRIG-
GER OUTPUT
1. Check for a 15 -kHz sine wave voltage
(from the drive converter board, PL -7674581)
at TP-2. It should be at least 20 volts peak -
to -peak.
2. Check the squash pulse at TP-4. It
should be 4.0 volts ± 0.5 peak -to -peak. The
pulse width should be 7.0 microseconds ± 0.5
at the tip.
3. Check the power supply trigger voltage
at J1 -B. It should be 20 volts
1.0 peak -to -
peak. The pulse width should be 1.0 micro-
second ± 0.5 at the tip.
SINE WAVE BUFFERS
1. Measure the sine wave at J1-6 (view-
finder high -voltage power supply). It should
be 20 volts ± 1.0.
2. Measure the sine wave at J1-7 (Camera
sweep). It should be 20 volts ± 1.0.
3. Check the sine wave atJl-F (viewfinder
sweep). It should be 20 volts t 1.0.
4. Adjusting the V F PHASE control, R12,
the sine wave should be phaseable over a
range of 5.0 microseconds. The amplitude
of this signal changes approximately four
volts, from 10 to 15 volts peak -to -peak.
TALLY LIGHT CIRCUIT
When +20 volts
is
applied to J1 -D, the
tally lights should light.
RELAY OPERATION
1. Closing the CALibrate switch on the
local Camera control panel should apply +20
volts to J1 -M; relay K2 should close, allow-
ing signals to appear at the calibration out-
puts.
2. Depressing a TEST (2 or 3) push but-
ton on the monitor selector panel, Model
4TC68B1, should apply +20 volts to J1-9.
Relay K1 should close, followed by relay
K2. The appropriate test video input signal
at J1 -K should appear at the outputs of the
Camera preamplifiers, J1-14, J1 -R, J1 -P,
and J1-13.
TEST POINTS
Additional test points may be located by
referring to the Schematic Diagram. These
test points further facilitate setup and main-
tenance.
Camera Sweep Board, PL -7674641
Refer to Figs. 31 through 36.
1. Check for the 15 -kHz sine wave voltage
from the drive converter board at J1 -V. It
should be at least 20 volts peak -to -peak.
2. Check the horizontal sweep with the
WIDTH control set at maximum. It should
be greater than 60 volts peak -to -peak.
3. Check the
vertical sweep with
the
HEIGHT control set at maximum. It should
be greater than 7.0 volts peak -to -peak.
4. Check the voltage across R74. It should
be 4.2 volts ± 0.5.
5. Check the vertical sawtooth skew am-
plitude. It should be 3.5 volts ± 0.05 peak -
to -peak.
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