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UPA224/UPA424
7
TESTING/TROUBLESHOOTING
Before finishing the installation, perform the
following tests to make sure the wiring is correct
and everything is operating properly.
Reconnect Battery
When wiring is complete, reconnect the battery
negative terminal.
Test Power Wiring
Turn on the receiver, but do not turn up the
volume. The amplifier power light should come
on. If not, check the REM and +12V wires. Turn
up the receiver volume slightly. All speakers
should operate. If not, check wiring connections
at amplifier and speakers.
Test Speaker Connections
These tests make sure the speakers are
connected properly. If speakers don’t play at all,
one (or both) speaker wires may be
disconnected.
.
Troubleshooting
Problem Possible Cause Corrective Action
Amplifier does not
turn on
No power to +12V terminal Check fuse(s)
No power to REM terminal Check head unit fuse(s) and wiring
Blown main fuse at battery Replace fuse and identify cause of failure
Blown fuse at amplifier Replace fuse and identify cause of failure
Faulty ground Reground main power ground to bare metal chassis
Volume control too
sensitive
Input level control adjusted too
high
Readjust the input level
Distorted sound Input level control adjusted too
high
Readjust the input level
Blows fuse(s) at
amp
Power wires connected backwards Reconnect power wires properly
Internal problem with amp Take unit for service
Engine noise /
Alternator whine
Ground loop(s) Use good quality shielded RCA cables
Faulty ground at amp Reground amp to clean bare metal chassis
Faulty ground at head unit Reground head unit to clean bare metal chassis
Inductive coupling Reroute RCA and/or speaker wires away from factory
harnesses
Input level on amp set too high Readjust input level
Poor bass response Speakers out of phase Check speaker polarity; reverse the connection to one
speaker only if two subwoofers are connected to the
amplifier.