32
à
When a piece of equipment is supplied with a three pin mains/line supply
lead all three pins must be connected in the correct fashion - see your
dealer if in doubt.
à
Check all interconnecting signal leads for good connections, both internal
connections and firm contact with the sockets. While the centre pin may
make firm contact, it is very important that the outer contact is also firm.
à
Never remove the earth/ground wire from the mains/line supply of any
piece of equipment. This could be hazardous.
Broken Earth Connections
This is a common cause of hum and noise in the system. In many instances, the
only way to eliminate the possibility of hum problems arising through a broken
earth connection somewhere in the system is to physically check every
connection.
Identifying
and Isolating
Problems
When experiencing a problem, such as one channel not working, or a noise in
one channel, it is good practice to adopt a method of isolating the problem to a
specific item or area. This practice will assist in diagnosing, curing, or at least
advising your technician of the problem and result in a saving of time, money
and perhaps frustration.
A logical approach to isolating the probable cause of the problem is to start at
the loudspeakers and work back to the music source, eliminating each piece of
equipment in turn.
Caution! Observe precautions regarding volume control settings. Please make all
changes at minimum volume setting. Only increase the volume after the
connections have been made.
Check that the entire system is connected in the proper manner and that the
mains/line supply is connected and switched on.
For clarity during this section, we have labeled one loudspeaker ‘A’ and the
other loudspeaker ‘B’. In this example, loudspeaker ‘A’ appears faulty.
Initial system connections
PREAMPLIFIER
AMPLIFIER
A
B
