Function
Procedure Indication
Fuse Test
A function to test whether any
fuse is good or blown open.
This amplifier is equipped with a
fuse tester in the lower right
corner of the Fuse/AC rear
panel. There are two fuse
holders, one larger and one
smaller, and a switch labeled
FUSE TEST. The Fuse test
system and the two fuse holders
are not part of the amplifier’s
protection circuitry, but are just
connected to a low voltage
sufficient to turn on the light if
the fuse in either holder is good,
and spare fuses may be kept in
either holder.
CAUTION: High voltages
present.
Do not remove any
fuses while the amplifier is
powered on. The fuse test
must only be done while the
amplifier is in standby mode.
Be sure that sufficient space
behind the amplifier is available
so that the fuse test assembly
can be accessed safely.
Remove any fuses that may be
inside either of the two fuse
holders in the test area. The
Fuse holders are connected in
parallel, and so the test will be
invalid if the user has fuses in
both fuse holders.
Note that there are two sizes of
fuses in the amplifier. Remove
the fuse to be tested from its
original fuse holder, and install
it in the appropriate sized fuse
holder.
To test either type of fuse,
insert the fuse into the
appropriate fuse holder, and
press the momentary Fuse Test
switch down.
If the fuse is good the light
turns on when the switch is
depressed, and if the fuse
is blown the light will not
turn on, indicating a fuse
that needs replacement.
Remove the tested fuse
and only reuse it if the test
result is good.
Otherwise, a new
replacement fuse is
needed. Contact your
authorized VTL dealer or
the VTL factory for
replacement fuses.
CAUTION: High voltages
present. For continued
protection against risk of
fire replace only with
fuses of same type and
rating.
S-400 Amplifier Owner’s Manual
VTL
38
