B&K 1076, Инструкция по эксплуатации, Страница: 14 / 64

picture is not in sync, rotate sync amplitude control to the opposite
phase, or -50 volts. This illustrates how the sync signal is used.
19. Plug the test lead into the 400 cycle Audio Tone jack and connect
the other end of the cable to the grid of the first audio amplifier
tube. With the Audio Switch in the "Tone" position, the 400 cycle
signal will be heard in the TV monitor loudspeaker. (NOTE:­
The Audio Gain Control of the Television Analyst does not control
the gain of this tone signal). Move the test signal lead to the grid
of the audio output tube. The tone again will be heard in the
receiver speaker.
20. Remove the audio signal lead from the monitor receiver and con­
nect the cable from the Vertical Grid Drive jack on the Analyst
to the grid of the vertical output amplifier tube of the monitor
receiver. Remove the vertical oscillator of the monitor receiver.
If it cannot be removed because it .is a dual purpose tube, or a
series heater set, disable the oscillator circuit. Notice that the pulse
from the Analyst will · operate the vertical amplifier and produce a
vertical sweep on the TV monitor receiver. The magnitude of the
vertical sweep can be controlled by t�e Vertical Drive Amplitude
control. This sweep may not be linear, or it may not fill the complete
vertical size of the picture tube because the pulse' may not be matched
to this particular vertical output circuit. However, it can very nicely
and qualitatively determine whether the vertical amplifier circuit
is operating correctly.
21. Remove the vertical 'pulse lead from the monitor and the Television
Analyst. Connect the lead from the Horizontal Grid Drive Pulse
output jack on the Analyst to the grid of the horizontal output tube
(6BG6-6BQ6). Disable the TV set horizontal oscillator, or remove
it from its socket. Note: Do not turn the TV set on without any
horizontal driving pulse to the horizontal output tube ( either from
the Analyst or the horizontal oscillator of set. Without driving pulses
to the horizontal output tube, the tube will burn up).
You will notice that the horizontal output of the monitor receiver
has a complete horizontal sweep and provides high voltage through
the high voltage rectifier, of the receiver. This will provide a quick
check to determine whether the fault is with the oscillator circuit
or the output circuit in trouble shooting horizontal circuits.
22. Remove the Horizontal Grid Driving lead. Connect a test lead from
the Plate Drive .Jack on the Television Analyst to the plate cap
connector of the flyback transformer ( the horizontal output tube
plate cap) of the test receiver. We are actually replacing the
horizontal section, including the output tube of the receiver with
the horizontal section and output tube in the Analyst. Put the
Plate Drive Selector switch on the Television Analyst to the Hori­
zontal position. Turn on the test receiver. The test receiver will
now have full Horizontal scan and high voltage. The Television
Analyst is providing complete drive for the horizontal output trans­
former of the test receiver. The B+ Boost indicator on the Tele­
vision Analyst will also light indicating that B+ Boost is present
in the test receiver.
23. Remove the horizontal plate drive lead from the plate cap of the
flyback, and restore set to original condition. Now connect plate
drive lead to the plate pin of the vertical output tube of the test
receiver. Remove the vertical output tube of the test receiver. Put the
Plate Drive Selector switch of the Television Analyst to the Vertical
position. Apply power to the test receiver. Vertical scan will now
result. The size of the scan on the test receiver can be adjusted
by means of the Vertical Drive Amplitude control on the front of
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