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DIDS -4 02 -2M 1 0
Para 4-1.
6/4-1.
7~
4-1.6 Monoscope Preamplifier A 7 (figure 4-6)
a.
Check the de voltages on the board (figure 4-1).
b.
Check the waveform at pin A, the output of the preamplifier (figure
4-6).
If the waveform is not present, check that the proper wave-
form is present at pinF (figure 4-6), the input to the preamplifier.
Check that all leads are properly fastened to terminals.
Replace
monos cope preamplifier A 7.
Check monos cope VI.
If signal is
present (at the output of the preamplifier), troubleshoot video ampli-
fie r AB.
I
--
l'
c-
~
.
1-_
"-++-+*-++++-+-+..j..~+->-t+t+-Y--t-4t~+I.f-"'" ~->-++
-
-
,
~
'-!"' • •
'++-~W--+-l--I-
4 ....
-1+--I-jll
>-+-<+
t,
t
t
'~I
I
A
F
Figure 4-6.
Monoscope Preamplifier A 7 Waveforms
4-1. 7 Video Amplifier AB (figure 4-7)
4-12
a.
Check the de voltages on the board (figure 4-1).
b.
Check the input waveform at pin K.
If it is not present, refer to
paragraph 2-3.2.
c.
Check the blanking signal at pin L.
If it is not present, check the
output from circuit board A 14, pin 2 (figure 4-1) and wiring.
d.
Check the CRT protect signal at terminal H.
This waveform will
be improper or the voltage more than 1 V when either the vertical
or horizontal sweep is not being generated.
Troubleshoot appro-
priate deflection amplifier A2(paragraph 4-1. 3 or 4-1. 4).
e.
Check the video output waveform at pin B.
If improper, replace
video amplifier AB.
Adjust the video level control (paragraph
2-3.2) only if necessary.
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