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Fa ult Finding Guide
Repairing a sound mixing console requires specialist skills, but
basic Fault Finding is within the scope of any user if a few
basic rules are followed.
• Get to know the Block Diagram of your console (see inside
rear cover)
• Get to know what each component in the system is
supposed to do.
• Learn where to look for common trouble spots.
The Block Diagram (see inside rear cover) is a representative
sketch of all the components of the console, showing how
they connect together and how the signal flows through the
system. Once you have become familiar with the various
component blocks you will find the Block Diagram quite easy
to follow and you will have gained a valuable understanding
of the internal structure of the console.
Each Component has a specific function and only by getting
to know what each part is supposed to do will you be able to
tell if there is a genuine fault! Many ‘faults’ are the result of
incorrect connection or control settings which may have been
overlooked.
Basic Troubleshooting is a process of applying logical
thought to the signal path through the console and tracking
down the problem by elimination.
• Swap input connections to check that the source is really
present. Check both Mic and Line inputs.
• Eliminate sections of the channel by using the insert point
to re-route the signal to other inputs that are known to be
working.
• Route channels to different outputs or to auxiliary sends to
identify problems on the Master section.
• Compare a suspect channel with an adjacent channel
which has been set up identically. Use PFL and AFL to
monitor the signal in each section.
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