T+A M 10, User Manual

Page: 45 / 54

45
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: Mains lead not plugged in correctly at
amplifier or mains socket.
Remedy: Check connections, push plugs in firmly
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 loudspeaker,    
LED flashes 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.
Cause 4: Mains interference / low voltage
Remedy:
If the mains voltage should fall to an
extreme level, or if powerful interference
should occur in the mains cables, the
M10
automatically switches the loudspeaker
outputs off in order to avoid adverse
effects on sound quality, and possible
damage to the loudspeakers.
When the mains supply is stable again,
the speaker outputs are automatically
switched back on.
Problem: When volume is very high the unit
switches off repeatedly.
Cause: Overheating due to bad ventilation.
Remedy:
Remove obstructions to ventilation.
Problem: M10 switches off, Problem LED flickers
Cause:
Extreme overheating
Remedy:
If the M10 suffers extreme overheating,
the cause may be an inadequate supply of
cooling air.
If this should occur, please disconnect the
M10 from the mains (pull the mains plug
out), and leave it to cool down for about
thirty minutes. Ensure that the machine is
not enclosed in any way, and that plenty of
air can reach it. Switch the amplifier on
again when it has cooled down. If it
switches off again, please refer to the
chapter entitled “Trouble-shooting” for
further information.
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.