PRECAUTIONS
1.
Always disconnect
the
chassis from power line when soldering. Turning
the
power switch
OFF
is
not
enough.
Power line leakage passing through
the
heating element may destroy
the
transistors.
2. Never
attempt
to
do
any work
on
the
transistor amplifiers
without
first disconnecting
the
AC line cord and
waiting until
the
power supply filter capacitors have discharged.
3. Replacement for
output
and driver transistors, if necessary,
must
be made from
the
same beta group
as
the
original
type.
4.
If
one
output
transistor burns
out
(open
or
short) always remove
all
the
output
transistors
in
that
channel
and
check
the
bias adjustment,
the
control and
other
parts
in
the
network
with an
ohmmeter
before inserting a new
transistor.
All
transistors
in
one channel will be destroyed if
the
base biasing circuit
is
open
on
the
emitter
end.
5. When mounting a replacement power transistor, be sure
that
the
bottom
of
the
flange,
the
mica insulators
and
the
surface
of
the
heat sink are free
of
foreign
matter,
for
they
may cause transistor failure.
6. Silicon grease must be applied between
the
transistor and
the
mica insulator, and between
the
mica insulator and
the
heat
sink for
better
heat
conduction.
7. Fuses must be replaced with size and
type
indicated. Use
of
other
types
can expose
components
to
destructive
current
levels.
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