MPR420
OPERATION
Troubleshooting
11
Problem
Cause
Action
Unit will not turn on
(no power)
Yellow wire not connected or incorrect
voltage Red wire not connected or
incorrect voltage
Check connections for proper
voltage (11~16VDC)
Black wire not connected
Check connection to ground
Fuse blown
Replace fuse
Unit has power
(but no sound)
Speaker wires not connected
Check connections at speakers
One or more speaker wires touching
each other or touching chassis ground
Insulate all bare speaker wires
from each other and chassis
ground
Unit blows fuses
Yellow or red wire touching chassis
ground
Check for pinched wire
Speaker wires touching chassis ground
Check for pinched wire
Incorrect fuse rating
Use fuse with correct rating
NO FILE appears
on display
No playable MP3 files found
on the device
Check the device for valid
MP3 files
NO SUPPORT appears
on display
An invalid ID3 tag version is present
Version 1.0 to 2.0 ID3 tags are
supported.
