Precision Power TD450 - Manual (Page 15)

N o i s e s W h i l e t h e E n g i n e i s O n
A l t e r n a t o r w h i n e :
This noise changes in frequency with engine RPM. Check for:
.
Excessive input level setting on the amplifier
.
High resistance in cabling or corroded and/or loose connections
.
Polarity of the input cables
If the problem persists, check the whines and pops checklist below.
T i c k s / b u z z :
This noise should go faster and slower with engine RPM, but not really change in
frequency. This is due to the ignition or the fuel pump.
.
Try moving the input cables to avoid contact with the fuel pump or wiring
If the problem persists, check the whines and pops checklist below.
A c c e s s o r y p o p :
This popping noise occurs as the result of turn signals, brake lights, etc. You can
try:
.
Moving the cables to avoid contact with the wires for the accessories
.
Relocating various ground connections
W h i n e s a n d p o p s :
If you have a combination of noises, or if one or more of the problems listed above
persists despite efforts to stop the problem, the noise may be caused by one or
more of the following problems:
.
Excessively high input level setting on the amplifier
.
Poor or open shielding, extra long cables or corroded input cables
.
Bad connections
.
Bad (or high resistance) system ground
.
Reversed polarity on audio signal cables
.
Poor quality source unit
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