BSS Audio FDS-318 Owner's Manual - Manual (Page 14)

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Fig 8.1 Mains fuse on
rear panel.
The incoming mains power is fused within the FDS-318 by the fuse holder
mounted on the rear panel (See figure 8.1). If it needs to be replaced it should
be properly rated as: 20mm 250V, T200mA for 240V voltage setting or
T250mA for 120V voltage setting. It is most important for continued safety that
this specification is strictly adhered to.
It is very unlikely that a fuse will blow during normal operation, and must be
treated with some caution as to the cause if it should do so. One of the most
likely reasons will be due to the incorrect setting of the voltage selector switch.
Another reason can be the inadvertent connection of line to line, rather than
line to neutral phase voltages when using a 3-phase power connection. In
either case, the transient suppressors can become damaged and constantly
blow replacement fuses. You can rest assured that your unit has been protected
from damage, but the transient suppressors will need to be replaced as soon as
possible for continued protection. Refer to section 12.2 for information on this
procedure.
8.3 AC Power
Fusing
When the FDS-318 is switched on with the power on/off switch (located on the
rear panel), the frontpanel LEDs showing the selected MODE will be
illuminated. This indicated that the internal power supply circuitry is
functioning correctly.
Should an incorrect sequence of MODE LEDs be illuminated, or the output
signal LEDs become illuminated with no input signal present, then an internal
DC fuse may have failed. Refer to section 12.3 for information on how to
check the unit for this problem.
8.4 Powering up
Connecting to power