Troubleshooting the Jensen POWER9001 Amplifier

Troubleshooting the Jensen POWER9001 Amplifier
Problem:	Solution:
Why won't the POWER900.1 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. Re-ground main power ground to bare metal chassis.
Why is the volume control on the POWER900.1 so sensitive?	Input level control adjusted too high. Re-adjust the input level (refer to page 8 of the user manual).
Why is the sound distorted with the POWER900.1?	Input level control adjusted too high. Re-adjust the input level (refer to page 8 of the user manual).
Why do the fuses keep blowing with the POWER900.1?	Power wires connected backwards. Reconnect power wires properly. Internal problem with amp. Take unit for service.
Why is there an engine noise or alternator whine when using the POWER900.1?	Ground loop(s). Use good quality shielded RCA cables. Faulty ground at amp. Re-ground amp to clean bare metal chassis. Faulty ground at head unit. Re-ground head unit to clean bare metal chassis. Inductive coupling. Re-route RCA and/or speaker wires away from factory harnesses. Input level on amp set too high. Re-adjust input level (refer to page 8 of the user manual).
Why did the thermal protection activate on the POWER900.1?	Amplifier driving 2 ohm load for long durations. If the amplifier “thermals” frequently while driving subwoofers, install fan to keep amp cool.
Why did the short circuit protection activate on the POWER900.1?	Blown speakers. Check all speakers. Speaker wire(s) shorting to ground. Check for faulty wiring. Defective crossover. Faulty passive crossover.
Why did the low impedence activate on the POWER900.1?	Amp connected to improper load. Check speaker connections. Amp will not drive a 1 ohm mono load, 2 ohm minimum in mono configuration. Verify that speakers are connected properly. Speakers defective/ blown. Check speakers. Faulty passive crossovers. Check crossovers.
Why is there a poor bass response with the POWER900.1?	Speakers out of phase. Check speaker polarity; reverse the connection to one speaker only if two subwoofers are connected to the amplifier.

NOTE: If the protection light is activated with no speakers connected to the amplifier, and all the power connections are correct, this would indicate an internal problem with the amplifier.