Audiovox AquaTronics MS-220 Owner's Manual page 7

Only one channel (right or left
side)
Popping in one or both channels
No AM Reception
Radio Balance
Speaker Disconnected
Speaker lead shorted or
grounded
Speaker wiring shorted or
positive lead grounded
Speaker terminals grounded or
shorted
Antenna disconnected
Antenna mast grounded or
shorted
Antenna center lead broken
Note: Antenna leads can be tested with continuity or multi-tester.
Some may have electronic component (capacitor) built in which will
not allow it to be tested.
7
Check radio function
Check speaker connection at
radio and/or speaker
Check speaker wiring continuity
to ground w/tester or meter
Leads from speaker cone to
terminal touching metal basket
or speaker
Connect antenna
Check antenna or substitute with
antenna known to be good
Check antenna or substitute with
antenna known to be good