user manual
TFS-780
TFS-780 user manual
Page 49
The faults listed above are governed by the EPC-780's protective features. The following are
more basic sound system faults:
Weak but clear sound
Weak but clear soundWeak but clear sound
Weak but clear sound
The signal level bargraph is probably reading low. If so, check attenuator and gain control
settings. Check the signal source's drive level. Likely causes include shorted input lines and
erroneous connections. If the bargraph is responding up to 0dB, check the output
connections and the drive-units.
Intermittent Sound
Intermittent SoundIntermittent Sound
Intermittent Sound
This is caused by a mechanically loose connection somewhere. Try exchanging cables or
shaking them to see if this triggers or changes the intermittence.
Coloured sound
Coloured soundColoured sound
Coloured sound
TMC amplifiers are unlikely to develop a frequency response problem, at least without more
serious effects. So a weird frequency response must be traced to either blown or mis-
connected drive-units, or misuse of preceding active crossovers and/or equalisers.
Noise, hum, and buzzes
Noise, hum, and buzzesNoise, hum, and buzzes
Noise, hum, and buzzes
If there is excess hiss, consider the output of the programme source. When set-up to real-
world requirements, some ancillary equipment such as digital signal processors produce
substantial hiss. In this case attention should be given to optimising the entire system's gain
structure. If a loud hiss persists when the input cables are disconnected, contact your
TURBOSOUND dealer for advice.
Hum is nearly always caused by grounding faults, errors and peculiarities. Because the AMP-
780 rack and LMS-D6 have been designed to be hum-free as a complete system, the search
must be directed at the interconnecting cables or the preceding equipment. Check cable
shield, signal ground and mains earth connections are intact. Then check for loops: the
resistance between mains earth (chassis ground) and signal ground in the system should be
above 20 Ohms.
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