US Blaster USB 1389, Owner'S Manual

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USB 1389 - 1390 - 1391 - 1392
Class-AB Power amplifiers
TROUBLESHOOTING
Power LED doesn`t light up
• check all fuses on the amplifier
• check main fuse near the battery
• check plus and minus battery cables
• check remote voltage
Power LED is on but no sound
• check volume control on the radio
• check GAIN regulator on the amplifier
• check RCA cables and connections
• check speaker cables and connections
Bass response is low
• one speaker cable could be disconnected
• the bass control on the radio is set on low
• an active crossover unit is adjusted wrong
• the amplifier switches
• bad chassis ground connection with amplifier
The amplifier switches on and off
• cable terminals and battery term inals are oxidized
• low voltage from the battery
• remote wire is connected wrong
One channel has no function
• check RCA connections of this channel
• check speaker connections of this channel
• balance regulator to the radio don’t set in the middle
• check speakers for this channel
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