Parasound 2250 manual 10PROBLEMS AND REMEDIES, No sound, Background Hum, Overheating

10PROBLEMS AND REMEDIES

No sound

-Check that AC is live.

-Is the unit on? Check the setting of the Auto Turn On switch.

-Doesn’t turn on with the Auto Turn On - Audio. Try the 12V trigger instead.

-Check that input cables and speaker wires are secure at both ends.

-Make sure the control preamp/receiver is switched to the correct input.

-If using Auto turn on, increase the sensitivity of the audio trigger.

-Is the Hi-Temp or Protect (or both) illuminated? Check for excessive temperature, short circuited speaker wires, low impedance speaker load, and inadequate ventilation to remove heat.

Background Hum

-Move the Ground switch to Lift.

-Move audio cables and AC cords away from each other.

-Try different routes for the audio cables and AC cords.

-Make sure insulating shoulder washers are used if unit is rack mounted.

-Try reversing the direction of each other component’s AC plug, one by one.

Overheating

-Remove any external sources of heat.

-Increase ventilation around the Model 2250.

-Reset the Load Impedance switch to 2-3 Ohms.