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TROUBLE-SHOOTING CHART
SYMPTOM
CAUSE
REMEDY
Preamplifier causes
power
line
fuse
to
blow.
Line cordy
J18yJ19,
primary
or high
voltage secondary windings
of T1 in-
correctly wired.
Repair
Pri./h.v.
sec.
windings
of
T1
shorted.
Replace
Any
tube filament not
lit.
Open
leod
from
6.
3V
winding
of Tl.
6.
3V
winding
of
Tl
open.
Repair
Replace
DC
voltage
at
V6
cathode
(pin
7)
is
incorrect
as
specified
below.
a)
No
voltage.
Defective
V6
C27A
shorted
intemaliy
or externally.
Open
R58
Connection
to
center-tap
of high
voltage
winding
of
Tl
is
open.
Replace
Replace
(or
repair)
Replace
Repair
b)
Low
voltage.
C27A O.K.
bot
C27B
or
C
shorted.
C27
open
or
rto
connection.
Excessive current drain
in
amplifier
Replace
Replace
(or
repair)
Repair
e)
High
voltage.
Tubes
V1-V4
defective or over-biased
and
not
drawing normol
current.
Repair
(or
replace)
Op«n
R53
or
ft54.
Roplaco
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Troubleshooting
