Nx Amplifier Troubleshooting - Ashly nX Series Operating Manual

Operating Manual - nX, nXe, and nXp 150W/75W Power Amplifiers
 14 nX AMPLIFIER TROUBLESHOOTING
No AC Power
1) Is the detachable AC power cord properly installed? Is it plugged into a known live outlet?
2) Has the power switch been disabled? (sec 4.7, 9.4a, 10.2)
3) Is the power-on delay time set high? (sec 3, 9.2c)
4) Is the amp asleep?
No Amplifier Output
1) Is the amplifier in standby mode? (sec 4.7, 6.3, 9.4a, 10.1)
2) Is there signal getting to the amplifier?
3) Is the input signal properly wired
4) Are output connectors properly wired
5) Are front panel, remote control, or software attenuators turned down?
6) Is the amp channel muted from within the control surface, DSP section, remote control, out-
put mixer, or event scheduler?
7) Are dynamics or gain tool settings in the DSP section allowing signal to pass properly?
8) Is the signal properly routed to the desired output in the DSP matrix router?
9) Is the fader level set properly in the DSP matrix mixer?
10) If using a DSP crossover on the outputs, are the filter frequency settings correct?
11) Did the event scheduler mute an output, change a preset or output channel source?
12) Is the amplifier in protect mode? see below, or
Protect LED is On
1) Does the amp still function, (fan still running)? If so, one or more channels of the ampli-
fier are applying live countermeasures to compensate for overheating, power limiting, or a power
supply voltage fault condition. The amp will continue to operate in a reduced capacity until the fault
condition is no longer present. Countermeasures include automatic attenuation of overheated or
excessive output power, and treatments for DC power supply voltage irregularities.
2) Has the amp shut down (fan stopped) with protect, sleep, and power switch LEDs all
on? If so, a critical situation has triggered a fail-safe fault response, latching the amplifier into its
shut-down state. AC power must be cycled to recover from this state. These conditions may be due
to internal component failure, so before cycling power, disconnect all speaker loads. The three criti-
cal fault conditions are:
A) Power Supply Fault - If protect, sleep, and power LED are on, and one or more channel's
clip/mute LED is also on, there is a power supply voltage fault condition on the muted channel(s).
B) Output DC Fault - If protect, sleep, and power LED are on, and one or more channel's
clip/mute LED and signal LED are also on, there is a DC output fault on the indicated channel(s).
C) High Temperature Fault - If protect, sleep, and power LED are on, and one or more
channel's clip/mute LED and temp LED are also on, there is a high temperature fault on the indicated
channels that could not be compensated for using countermeasures.
In all cases, if the protect, sleep, and power switch LED remain on after cycling power, the
critical fault condition still remains and the amplifier requires servicing.
52
(sec 4.6)
(sec 2.2)?
(sec 2.3, 5.6)
(sec 9.4d)
(sec 4.6)
(sec 9.4d)
(sec 9.4g)