Jensen PS285 Operation Manual - Page 11

PS260 / PS285 / PS2130 / PS2180 Troubleshooting Problem Amplifier does not turn on Volume control too sensitive Distorted sound Blows fuse(s) at amp Engine noise / Alternator whine Thermal protection activated Short circuit protection activated Low impedance protection activated Poor bass response Possible Cause Corrective Action 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 Input level control adjusted too Readjust the input level (refer to page 9) high Input level control adjusted too Readjust the input level (refer to page 9) high Power wires connected backwards Reconnect power wires properly Internal problem with amp Take unit for service 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 (refer to page 9) Amplifier driving 2 ohm load or If the amplifier "thermals" frequently while bridged mono for long driving subwoofers, a fan may need to be durations installed to keep amp cool Blown speakers Check all speakers Speaker wire(s) shorting to ground Check for faulty wiring Defective crossover Faulty passive crossover Amp connected to improper Check speaker connections load Amp will not drive a 2 ohm Verify that speakers are connected properly mono load, 4 ohm minimum in mono configuration Speakers defective/blown Check speakers Faulty passive crossovers Check crossovers Speakers out of phase Check speaker polarity; reverse the connection to one speaker only 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. Specifications CEA Power Ratings PS260 Power Output: 57 watts RMS X 2 channels into 4-ohms @ < 1% THD+N Additional Power Output: 75 watts RMS X 2 channels into 2-ohms @ < 1% THD+N 155 watts RMS X 1 channel (Bridged mono) into 4-ohms @ < 1% THD+N Dynamic Power: 114 watts X 2 channels into 4-ohms Dimensions: 7" X 12" X 2 ¼" (180mm X 302mm X 55.5mm) PS285 Power Output: 80 watts RMS X 2 channels into 4-ohms @ < 1% THD+N Additional Power Output: 105 watts RMS X 2 channels into 2-ohms @ < 1% THD+N 215 watts RMS X 1 channel (Bridged mono) into 4-ohms @