Service manual
Table Of Contents
No
picture
(no raster)
with
normal
sound
NOTE:
1702
locations are
in
(
).
[Cause]
Malfunction
of
the video amplifier
IC201,
X202
(lC201,
0201)
The video signal and
the
audio signal
output
are supplied respectively
to
the video amplifier
IC20
1
and
the
audio
circuit
IC601 . Sound is had
but
no picture; therefore, the
faulty
part is IC201 and its
external elements. Since pin
16
of
the IC201
to
the
cathode
of
CRT is connected by a DC-coupled
amplifier, a
fault
raising the
emitter
voltage
of
X202
(0201)
will
cause the three initial
ouptut
tran-
sistors
to
cut
off,
resulting in no raster.
Check also
the
screen grid
circuit
for
igniting
the
CRT heater and the high voltage module.
No
sound
(with
normal
picture)
NOTE: 1701 -
Flowchart
1702
-
Audio
circuit
has been reduced
to
IC601.
[Cause]
Trouble
in
the
audio
circuit
IC601,
X601,
X603
or
X604
are
faulty.
•
C60S
open
•
IC601
is
faulty
NO
How
is
110V
collector (Normal)
voltage
of
X602?
OV
.X602,
X603
short
.FR6010pen
•
X601
(open I
•
T602
(shortl
•
X601
(shortl
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