Test the Ground Fault Interrupt Circuit before using the Rackpower 320.
Place all Ground Control Switches in the “Ground” position. Connect all
desired equipment and turn on the Rackpower 320.
A ground loop is one of the causes of annoying low frequency “hum”
that can appear in an audio system when several pieces of equipment are
connected to the same power source. To test for a ground loop lift the
Ground Control Switch to a single outlet, beginning with outlet #1 and
continuing with #2, #3 and so on until the ground hum disappears or is
greatly reduced compared to the original volume.
Through this process the hum may have been eliminated, but some
grounds have been unnecessarily lifted that belong to equipment that
was not causing the hum. Leaving the last outlet you operated in the
“Lifted” position, the Ground Control Switches should be returned one
at a time to the “Ground” position. If the hum returns after grounding a
particular outlet that outlet should be relifted.
Note that if equipment is connected to the Rackpower 320 by a power
cord that does not have a 3rd pin ground, lifting the ground to that outlet
will have no effect.
TROUBLESHOOTING
The Rackpower 320 is ruggedly designed and constructed from high
quality components to give years of dependable power for your equip-
ment. It requires neither maintenance or adjustment. In the unlikely
event of malfunction, the following checklist will be helpful.
OBSERVATIONS
1. The Rackpower 320 will not come on or turns itself off.
a. Check that the power switch is in the “on” position.
b. Check to see that the unit is plugged in.
c. Make sure main AC line power is available from the source.
d. Check that the ground fault interrupt circuit has been set and
that the pilot light is on. If this protection circuit will not
reset it may be experiencing a dangerous ground or neu
tral fault. Unplug the Rackpower 320 and contact a
qualified electrical technician.
e. Check that the circuit breaker is not tripped and that the cur-
rent load on the unit does not exceed its rated 15 amp capacity. If the
