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TROUBLE-SHOOTING CHART
SYMPTOM
CAUSE
REMEDY
House power
line
Fuse
blows;
Short
in line
cord, J2,
J3
or
associated
Repair
fuse,
FI, remains
intact.
equipment plugged
into
J2
or J3.
'
.
Fuse, FI, blows*
If
the amplifier causes
a replacement
fuse
to
Check
and
repair or
replace*
blow
with
rectifier
tube
V5
removed,
primary
or
high voltage
secondary windings
of
T2
are
Incorrectly
wired
or shorted*
If
the amplifier
does
not cause
FI
to
blow
Check
and
repair or replace*
when
V5
is
out
of the socket,
but does
cause
FI
to
blow
when V5
is
placed back
In
the socket, then
check
for
short
In
B+
circuits,
or
defective
V5, CIO,
C
II
*
V5
filament not
lit.
Incorrect
wiring
of
ft!,
leads
to
V5
socket*
5V
HI.
winding
of
T2 open.
Repair
Replace
12.
Any
or
all
other tube filaments
not
Ilf.
Open
lead
from
6*
3
V
winding
of
T2,
6.
3
V
winding
of
T2 open*
Repair
Replace
T2.
DC
voltage at
V5
cathode
{pin
8)
Is
incorrect as specified
below*
a)
No
voltage*
Defective
V5,
CIO
shorted internally
or externally*
Replace
Replace
Connection
to
center-tap
of
high-
voltage winding
of
T2
is
open*
Open
R22.
Repair
Replace
b)
Low
voltage.
C11
shorted Internally
or
externa
My*
Replace
or repair
i'
Connection
to
C
10
from pin
8
of
V5
is
broken, or
open CIO.
Repair or replace
Excessive current drain
In
amplifier.
Repair
c)
High
voltage.
Output
tubes
V3 & V4
over-
biased
and
not
drawing
current*
V3
or
V4
defective.
Repair
Replace
Open
R9
or RIO,
Shorted R22,
Replace
Repair or
Replace
7
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Table of Contents
Troubleshooting
