NKI1480B DAX60 and DAX120 Amplifiers—Installation
Page 10 of 18 (Jul-98)
fuse. Use a fast-blow fuse: 2.5 Amps for the DAX6O, 5 Amps for the DAX12O
(but only half of these values if the amplifier is operating from a 240-VAC line).
The fuse holder is on the rear of the amplifier, below the power transformer. You
will need a Phillips screwdriver to remove the center plug; you may find a scissors-
nosed pliers helpful in removing the fuse. If the replacement fuses continue to
blow, unplug the amplifier and consult a qualified service representative.
Initial Troubleshooting
Consult the following troubleshooting table when experiencing any difficulties:
Problem
Possible Causes
Low volume or distorted sound.
Check whether all the input and output
connections are properly made and fastened.
Turn the volume down to determine if the
speakers are being overdriven.
Amplifier does not operate.
Make sure the power cord is plugged in to an
operating outlet.
Examine the input and output lines for (1)
obvious shorts (among themselves and between
them and the chassis or surrounding equipment)
and/or (2) broken connections.
Replace the fuse, if all else checks out.
Unplug the unit and contact your local
distributor (if all else fails).
The 28-VDC output cycles off
and on, or remains off.
There are two circuit breakers protecting this
output. CB2 is a 1.6-Amp thermal breaker that
shuts down the circuit when the DC current
flow significantly exceeds the output’s 1.2-
ampere rating, then automatically resets. It will
continue cycling off and on until the problem is
corrected. If the amplifier remains off, CBl
(3.15 Amps) may have tripped. Check for a
short in the connections; then try manually
resetting CB1—by poking a small screwdriver
through the access hole in the front cover (at the
upper left corner of the DAX6O,or the lower
left corner of the DAX12O).
If the problem does not lie in the load or the
connections, one of the breakers may be
defective. Disconnect the load and call your
Rauland distributor.