Ashly nX Series, Operating Manual

Page: 52 / 60

Operating Manual - nX, nXe, and nXp 150W/75W Power Amplifiers
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
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, output
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 (LED ERROR CODES)
1) Does the amp still function, (fan still running) ? If so, one or more channels of the amplifier
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 condi-
tion is no longer present. Countermeasures include automatic attenuation of overheated or exces-
sive 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.
D) Microcontroller Thermal Fault - If protect, sleep, and power LED are on, and the temp and clip
LEDs are lit on all channels, there is a micro-controller thermal fault. This is not likely to occur unless
the fan fails and/or the amp is running in an unventilated environment.
3) Has the amp shut down (fan stopped) with Protect, Power Switch LED and Clip/Mute
LEDs all on? If so, this indicates that the power supply has shut down due to excessively high or
low AC Mains voltage. The amplifier will automatically recover as soon as the AC voltage returns to
a safe operating level. (See sec 15 -
Operating Voltage Range
)
If the protect, sleep, and power switch LED remain lit after cycling power, after the amplifier is
allowed to cool, and after verifying that the AC mains are within an acceptable range, the critical
fault condition still remains and the amplifier may require servicing.