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Source input problem

Source selector problem, for eg if the selector is on cd and i plug a cd player in the tuner input, i can hear the sound. no matter what source the selector button is on.

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  • Seamus377 Aug 23, 2008

    denon pma-355uk amplifier

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Hi Seamus377

You have a faulty input selector chip by the sound of it. First, power the amp off at the wall for 30 mins, then fire it up again to see if that resets the problem.

Hopefully that fixed the problem, if not, you may need to get a tech to look at it. The input selector chips are quite sensitive and susceptible to failure, producing the symptoms you speak of. They can be damaged also and fail at any point if subjected to a voltage spike. Here is why they fail

When outboard devices such as

  1. TV that has an outside aerial
  2. VCR with Switch Mode Power Supply
are plugged into your amp, the RCA connectors connect the center "signal" connection first, then the earth ring. Until the earth ring connects, any potential difference or stray voltage present on the earth of the connection being plugged in, can result in as much as 50volts being spiked into the input selector chip. I have seen scores of amps damaged by this.

How to avoid it

Before making any connections to your amp, FIRST
  1. Disconnect external aerials
  2. Turn off all equipment at the wall socket
  3. connect all the gear and aerial LAST
  4. fire the gear up
Good luck, hope you get it sorted out. I am more than happy to answer any other questions you may have about it, please get back to me here, or use the ASK function to go straight to me :) If you are still unsure, have problems, or we need to look at the situation more deeply, then before you give a rating for this advice, hit the ASK button Thanks for using FixYa, If you consider the advice I have given you as sound, a FixYa rating is a great reward for my efforts to help you. Cheers.

regards robotek



Posted on Aug 24, 2008

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