GE 4PE350A3 Instructions Manual page 45

COLOR CAMERA
EBI-6351
The primary function of this panel is to
facilitate Camera registration. With the prop-
er setting of the WIDTH control, the nominal
peak -to -peak voltages for
the horizontal
sweep return may be monitored by using
an oscilloscope for the W, R, B, and G
channels.
The resulting voltages may be
compared with the waveforms for the reg-
istration control panel.
The HEIGHT control settings and wave-
forms for the vertical sweep return may be
checked in the same manner as described
previously.
The other potentiometers on this panel
can be checked, using the oscilloscope and
observing that the control has the proper
operating characteristics. These controls
should turn from CW to CCW, or vice versa,
without drag or skipping. Replace any ques-
tionable component using the Parts List in
this instruction book.
Local Camera Control Panel,
PL -7674510
Refer to Figs. 69 and 70.
This panel is the central setup and read-
out point containing the various potentiom-
eters, switches, and a meter.
The input and output voltage and video
level readings are monitored through the d -c
metering printed circuit board. Periodic
inspection of open switch contacts for dirt
and scoring insures satisfactory operation.
Check toggle switches for make and break
operation during the course of normal op-
eration. The potentiometers can be checked,
using an oscilloscope and observing that they
have the proper operating characteristics.
They should turn from CW to CCW, or vice
versa, without drag or skipping. Replace any
questionable component using the Farts List
in this instruction book.
Camera Vertical Transformer
Refer to Figs. 71 and 72.
Use an oscilloscope to make the following
voltage checks:
1. The voltage at terminal 6 should read
2.0 volts ± 0.5 peak -to -peak at the vertical
rate.
2. The voltage at terminal 1 should read
4.0 volts = 1.0 peak -to -peak at the vertical
rate.
3. The voltage at terminal 5 should read
16 volts ± 4.0 peak -to -peak at the vertical
rate.
4. The voltage at terminal 4 should read
14 volts ± 4.0 peak -to -peak at the vertical
rate.
NOTE
The transformer readings
are
dependent upon the setting of the
vertical HEIGHT control which ac-
counts for the wide tolerances.
Filter Disk
Refer to Fig. 3
The filter disk is located in front of the
prism. It contains eight filters which are
selected by the numbered control wheel.
The filter disk control wheel is located
and protrudes from the right-hand Camera
door. A numbered chart corresponding to
the numbers on the control wheel designates
each filter function relative to the lighting
conditions encountered when using the Color
C amera.
Voltage Waveform Phase Relationships
When using waveforms as a means for
troubleshooting transistor circuitry, there
are certain basic transistor characteristics
which should be understood by service per-
sonnel. These exist between common emit-
ter, common collector, and common base
amplifier stages. For the sake of simplicity,
a positive going sine wave is used as the
reference voltage waveform; the same prin-
ciples, however, apply to any other form of
voltage waveform.
COMMON EMITTER AMPLIFIER
A positive -going voltage waveform applied
to the base of this amplifier results in a
voltage waveform on its collector which is
180 degrees out -of -phase with that on its
base as shown in Sketch B.
31