Operating instructions
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Apply
a signal to
terminal 2 of
V8,
and listen for
a low-volume
signal in
both the
speaker
and headset. This
will check
the
speaker, headset,
output
transformer,
headset
connectors,
and
speaker
switch. If
there
is no
signal,
examine these
components
and asso-
ciated
wiring.
Place
the audio signal
on
pin
6 of
V8.
Listen
for an increased
output
(rela-
tive to the test in
(1)
above)
in the
headset
or speaker. If
the output
is
weak
or distorted, check
the tube. If
no signal
is
heard,
check for
-4
volts
dc at
pin
8 of
J4,
Bf
and screen
voltage of
V8. Check resistors R24,
R25,
and R26
and capacitors
C37
and
c38.
(3)
Apply
the
audio signal to
pin
2
of. Y6
and listen
for the signal in
the
head-
set
or speaker. If
there is
no
signal,
check capacitor
C34, resistor R19B
(4.F.
GAIN control), resistor
R22,
and capacitor
C35.
(4)
Apply
the
audio
signal
to
pin
6 of
V6
and listen for
an increased
output
(relative
to
(1)
,
(2),
and
(3)
above)
in
the
speaker or headset. If
the sig-
nal
is
weak, check the
plate
and screen
voltages
of V6. If there
is
no
signal,
check
the tube and
the
wiring.
If the
signal is
distorted, check coupling ca-
ttz
crc c2ú
R23
v3 R9
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bottom aiew
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(1)
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