Operating Manual - nX, nXe, and nXp 150W/75W Power Amplifiers
52
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?
(sec 4.6)
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
(sec 2.2)
?
4) Are output connectors properly wired
(sec 2.3
,
5.6)
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?
(sec 9.4d)
9) Is the fader level set properly in the DSP matrix mixer?
(sec 9.4d)
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?
(sec 9.4g)
12) Is the amplifier in protect mode? see below, or
(sec 4.6)
Protect LED is On
1)
Does the amp still function
, (fan still running)? If so, this means that one or more channels of
the amplifier are applying live countermeasures to compensate for overheating, power limiting, or
a power supply voltage fault condition, and the amp will continue to operate in a reduced capac-
ity 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, this indicates a critical situation where a fail-safe fault response has been triggered, latching
the amplifier into its shut-down state until the AC power is cycled. These conditions may be due to
internal component failure, so
before cycling power, disconnect all speaker loads
. The three critical
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.
Clip/Mute LED Stays On
1) Is the front panel level control, remote DC level, or software control surface fader fully off?
2) Is the amplifier muted from software, a remote control devices, or an event scheduler action?
Attenuators Don't Work
1) Are the rear panel or remote attenuators disabled? (sec
4.4
,
9.4a
)
Amplifier Not Recognized in Protea
ne
Software
1) Is the PC successfully communicating with the network?
(sec 8)
2) Is the amplifier successfully communicating with the network?
(sec 8)
3) Does the amplifier name appear as green text in the Ashly network device tree?
(sec 9.1a)
