Maintaining Your Model 275
Your Parasound Model 275 power amplifier requires no periodic maintenance other than the
knowledge that you are bragging about it to your friends. It has no user-serviceable parts inside.
To avoid the risk of electric shock, do not remove its top cover. The exterior can be cleaned
with a soft cloth pre-moistened only with a few drops of water or glass cleaner.
Troubleshooting
No sound
•
Check that AC is live.
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Is the unit on? Check the setting of the Auto Turn On switch.
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Doesn’t turn on with the Auto Turn On - Audio. Try the 12V trigger instead.
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Check that input cables and speaker wires are secure at both ends.
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Make sure the control preamp/receiver is switched to the correct input.
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If using Auto turn on, increase the sensitivity of the audio trigger.
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Is the Hi-Temp or Protect (or both) illuminated? Check for excessive temperature, short circuit-
ed speaker wires, low impedance speaker load, and inadequate ventilation to remove heat.
Background Hum
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Move the Ground switch to Lift.
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Move audio cables and AC cords away from each other.
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Try different routes for the audio cables and AC cords.
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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
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Remove any external sources of heat.
•
Increase ventilation around the Model 275.
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Reset the Load Impedance switch to 2-3 Ohms.
PROBLEMS AND REMEDIES
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