Trouble Shooting - T+A A 1560 User Manual

Many problems have
correspondingly simple solution. The following section
describes a few difficulties you may encounter, and the
measures you need to take to cure them. If you find it
impossible to solve a problem with the help of these
notes please disconnect the unit from the mains and ask
your authorised  specialist dealer for advice.
Problem: Amplifier does not switch on, or does
not respond to the controls.
Cause 1: Mains lead not plugged in correctly at
amplifier or mains socket.
Remedy: Check connections, push plugs in firmly
Cause 2: Mains fuse burned out.
Remedy: Replace the fuse in the mains input
socket. Be sure to use a fuse rated at the
values printed on the amplifier.
Problem: The unit cannot be operated.
Cause: Static discharge or powerful interference
(e. g. lightning)
contents of the processor memory.
Remedy:
Disconnect the mains supply, wait about
3 minutes, and plug in again. Switch the
amplifier on.
Problem: No output signal at the loudspeakers,
LEDs over the 
buttons flash alternately (PROTECTION
circuit tripped).
Cause 1: The PROTECTION circuit has cut in due
to overheating or excessive levels.
Remedy: Reduce volume; if the amplifier does not
switch on again automatically after about
20 seconds it has become too hot and
should be left for a few minutes to cool off.
Cause 2: Short circuit in the loudspeaker cables,
e. g. projecting wire ends at the speaker
terminals, or mechanical damage to the
cable.
Remedy: Check speaker leads and terminals, twist
wire ends
damaged cable.
Cause 3:
Excessive levels due to poor earth
contact.
Remedy:
Unplug input lead and wait to see if the
power amplifier
automatically. If so, check and replace
input leads if necessary.

Trouble shooting

a simple cause and
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 and  
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switches on again
a
Problem: When volume is very high the unit
switches off repeatedly.
Cause 1:
Overheating due to bad ventilation.
Remedy:
Remove obstructions to ventilation.
Cause 2:
Overheating
loudspeaker impedance.
Remedy:
The impedance of each speaker must not
be lower than 4 Ω (that means - DIN rating
– an impedance minimum >3.2 Ω).
Problem: Flat sound image, insufficient bass
response.
Cause: The loudspeaker cables are not connected
"in phase".
Remedy:
Refer to the wiring diagram, check the
connections between the loudspeaker
leads and speakers, and the speaker
terminals on the amplifier. Correct where
necessary.
33
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