TEST
#2
VERTICAL
DEFLECTION
AMPLIFIER
(Y1-Y2-CHOP-AL
T)
U102 incorrectly installed or fault
3
r
switch SW4 incorrectly wired or
f<
sw
'i_
~
~
Make
sure
Verti
c
al
Mode
swit
ch
Measure the voltage on
U102
. These voltages
(Y1-Y2-CHOP-ALT) is
in
the
Y1
position. Measure
should be: pin 6 greater than +2.4
~
olts
;
pins 2, 3,
~/._
th
e voltage at the collector (c)
of
0118
. This voltage
and 8 less than + .8 volts.
Measure the pin 8 of U101. This '
should be +9.0 volts. Then measure the voltage at
the collector of
0117
. This voltage should be + .6
~~
less than + .8 volt.
volts. NOTE: These voltages will be reversed with
)
the Verti
cal
Mode
~
switch in the
Y2
position.
0117
or
01
18 incorrectly installed or faulty.
~~
2>
~
Measure the voltages at the collector
of
0115
and
Measure the voltage at the drain (pin 6) of 0101 and
0101 faulty. Check associated cira
adjust the VERTICAL DC BAL control to obtain 0 volt
0116
. These voltages should be the same.
DC.
incorrect parts values).
~E?
~
·-
The vertical deflection amplifier circuits are
Tum the power o
ff
and short
th
e base of
0113
to
the
operating properly.
base of
0114
. Turn the Oscilloscope on.
~)
t3>
0113
or
0114
incorrectly installed o
The collector voltages of 0115 and
0116
are the
associated
circuitry (soldering,
ir
same.
values).
~
Turn the power off and remove the short connected
between
0113
and
0114
.
Th
en short the base of
0111
toth
ebase
of0112
. Turn the Oscilloscope on.
~/
tV
The collector voltages of 0115 and
0116
are
th
e
0111 or
0112
incorrectly installed
associated
circuitry
(soldering,
same.
values).
~E~
Turn the power off and remove the short connected
between 0111 and 0112. Then short the base of
0104
to the base
of010
5. Turn the Oscilloscope on.
v
tV
The collector voltages of 0115 and
0116
ar
e the
0104
or
0105
incorrectly installed c
associated
c
ir
cuitry
(soldering,
i
same.
values).
~~
Turn the power off and remove the short connected
between
0104
and
0105
. Then
sh
ort pin 4
to
pin 8 of
0102
. Turn the Oscilloscope on.
v
~
The collector voltages of 011 5 and
0116
are the
0102
faulty. Check associated ciret
sam
e.
~
incorrect parts values).
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