T+A A 1560, Руководство пользователя

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33
Trouble shooting
Many problems have a simple cause and a
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) have corrupted the
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
    and    
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 together neatly, replace
damaged cable.
Cause 3: Excessive levels due to poor earth
contact.
Remedy: Unplug input lead and wait to see if the
power
amplifier switches on again
automatically. If so, check and replace
input leads if necessary.
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 due to inadequate
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.