13
Problems and Remedies
Unit Will Not Turn On
• Check the setting of the Turn On Options switch. (The front panel Power button will be
disabled if the switch is set to Audio or 12V). First try the Manual position and see if the
unit will turn on by pressing the front panel Power button.
• If using Audio Turn on, try increasing the sensitivity of the audio trigger by setting the Turn
On Option switch
to the ―Quieter‖ position.
• If using Audio Turn on and you need the Model 275 v.2 to turn on at an even lower volume
level, simply turn down its L and R Level controls. Try setting the level controls at 12
o’clock and see if the volume level is low enough when the amp turns on.
• Check that the AC power is live.
No Sound From the Speakers (but amp turns on)
• Ensure that the front panel speaker buttons for A and B are turned on (button pressed in).
• Try turning up the Level controls for the Left and Right channel.
• Check that input cables and speaker wires are secure at both ends (turn amp off first).
• Make sure the preamp is switched to the correct input.
• Is the Protect light illuminated? Check for excessive temperature, short-circuited speaker
wires, very low impedance speaker load, and inadequate ventilation.
Background Hum or Hiss
• If you have cable or satellite TV, try disconnecting the incoming TV or satellite cable; if the
hum
is eliminated you will need a ―cable TV ground isolator‖ or contact your TV service
provider for assistance.
• Make sure insulating shoulder washers are used if unit is rack mounted.
• Make sure all equipment is plugged in to the same AC outlet to eliminate ground loops.
• Try turning down the input Level controls.
• Move audio cables and AC cords away from each other.
• Try different routes for the audio cables and AC cords.
The Amp is Overheating or the Hi-Temp Indicator is Illuminated
• Increase ventilation around the Model 275 v.2.
• Check speakers for faults.
• Change the Speaker Load switch to the 2-3Ω setting.
• Remove any nearby external sources of heat such as other audio equipment or heaters.
