Identifying
and Isolating
Problems
Caution!
When a piece of equipment is supplied with a threepin mains/line supply lead all three pins must be connected in the correct fashion - see your dealer if in doubt.
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.
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.
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.
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 labelled one loudspeaker ‘A’ and the other loudspeaker ‘B’. In this example, loudspeaker ‘A’ appears faulty.
Initial system connections
PREAMPLIFIER
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