Ps-audio TRIO A-100 User Manual download pdf (Page 10)

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Troubleshooting 6

Troubleshooting

Owner’s Reference A-100 Power Ampliﬁ er

If no sound comes out of the A-100 Power Ampliﬁ er there are several areas to check. Either you are

not getting an audio signal into the ampliﬁ er, you are not properly connected to the loudspeakers so

the audio can get out of the ampliﬁ er, or there is no power from the AC socket.

It is obviously important that the A-100 Power Ampliﬁ er receive a high level signal from the preampliﬁ er,

surround processor or whatever source you are feeding it. One way to determine if this is the case,

would be to ﬁ rst go to your loudspeaker. Place your ear near the tweeter and listen for a very slight

hiss. If you hear one, chances are good the amp is working ﬁ ne, connected properly at the speakers

and you have an input problem. If you suspect an input problem, the ﬁ rst thing to check is the rear

panel switch. The switch on the rear of the A-100 Power Ampliﬁ er is an input selector. With a source

connected to the preamp and the preamp volume turned up, click the rear mounted input selector on

the A-100 Power Ampliﬁ er to both positions and see if this solves the problem.

If not, place the switch to the proper position and replace the interconnects between the preamp and

power amp. At last resort, if you suspect an input problem, try another preamp, or plug the output of

your CD player or DVD player directly into the A-100 Power Ampliﬁ er. Be careful to choose a CD or

DVD with relatively soft music because this will play very loudly.

If you suspect an output problem, use the same technique of placing your ear very close to the

speaker’s tweeter while the A-100 Power Ampliﬁ er is turned on. You should hear a very slight amount

of hiss from the tweeter. If you do not, check the speaker cable/amp connection. Make sure the

amp’s front panel light is on, indicating proper performance.

If there is no sound and you are convinced the A-100 Power Ampliﬁ er has power and its front panel

light is lit, contact your dealer, distributor or PS Audio for further assistance.

If there is an excessive amount of hiss or noise from the loudspeaker, it is probably not from the A-100

Power Ampliﬁ er as this amp has extremely low self noise. Turn the amp off, remove the interconnect

cables from the A-100 Power Ampliﬁ er and then turn the ampliﬁ er back on. Listen once again to see if

the noise has been diminished. If it has, chances are good you either need to replace your preampliﬁ er

with a quieter one or you may need to experiment with better shielded interconnect cables.

If you experience a hum through the speakers this can be caused by several things. The ﬁ rst is the

source. If there is an excessive amount of buzz or noise from the loudspeaker, it may be caused by a

ground loop, a light dimmer in the home, poor AC power, or any number of causes. The quickest way

to determine where to start your search is to simply turn the amp off, disconnect the cables feeding

its input, and see if the hum goes away when you turn it back on. If it does, it’s most likely a ground

loop or buzz from a dimmer.

The easiest way to ﬁ gure out where ground loop problems lie is by the process of elimination. You

need to determine where the hum or buzz is coming from within your system.

If the hum/buzz goes away when you remove the inputs to the power amp, your next step will be

No sound comes

out of the amp

Check the input

If you suspect an

output problem

If there is a lot

of hiss in your

speaker

Check the rear

input selector ﬁ rst

Try another

source

If you have hum

or buzz

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Ps-audio TRIO A-100 User Manual Page 10

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