ASA Electronics MS-306 - Manual (Page 8)

AM/FM RADIOS
Symptom Cause Possible Solution
No Power No 12VDC Check circuit fuse at source
Check in-line fuse on power lead
(wall mount units are located in
rear cabinet)
Power lead disconnected
Ground connection
No 12VDC to memory lead
(electronically tuned units only) Circuit fuse at source
In-line memory lead fuse
Speaker Output shorted Check continuity of speaker
leads to ground
Power indicated; No audio
output
Speaker out cross channeled Check for proper speaker wiring.
Note: Radios have a sticker on
them explaining wiring color
code.