2. amps-preamps
  3. 1230236104

Integrated changes input selection by itself

Hello. My MF A3.5 has started changing it's input selection to Tuner ALL BY ITSELF. It does this intermittently. I have only two inputs connected, CD and Aux1. There is no other source for the amp to play, yet it switches to Tuner every once in a while. It plays normally, and then jumps to the Tuner input. I then select the Aux1 or CD input with no effect other than I missed a few bars of Jazz. Everything else seems to be normal.

I've had the amp for several years now, and purchased it as a demo from an Audiogon member. This behavior of self-selecting to the Tuner input is a very recent phenomenon.

Here's my system: http://forum.audiogon.com/cgi-bin/fr.pl?vevol&1187457873&view. I've traded up to the Quintet for power filtering and upgraded the speaker wires to Kimber 8PR, all last year.

I could not find any posts with this issue so I'm asking this community for comments and suggestions. Thanks.
128x128markemark
markemark's avatar
markemark OP
12 posts
 
Interesting development. The system changed input selections after I removed the post-it note covering the IR port. It does this after some time just playing. Seems like something is triggering it. I'm going to try removing the batteries from the remote and removing the post-it note from the IR port.

Must find gremlin.
Post removed 
badcap
15 posts
 
If you have an fluorescent light near the sensor it can cause the problem.
markemark's avatar
markemark OP
12 posts
 
I removed the batteries from the remote and left the IR port on the amp uncovered. The amp repeated the change-- selecting another input with no action by me. I then looked for another IR source that could be causing this and remembered my IR-to-RF converter.

This device effectively extends the range of any IR device by inserting an RF transmitter into the battery compartment of the remote, and then duplicating the IR codes to the hi-fi unit. I've had it for many months and forgot about it. I also am not using it with the amp, but instead use it with my Squeezebox player, so the converter is only sending SB IR codes.

The IR extender has options to transmit on 3 frequencies, so I selected C when the unit had been on B. It's been a few days and no repeat of the issue. Amp seems to be working normally and I can still change Pandora selections from anywhere in the house.

Odd that I've been using my system with the extender with no issues for many months and only recently did this issue appear.

Here's the Amazon link for anyone interested:
http://www.amazon.com/Next-Generation-Remote-Control-Extender/dp/B000C1Z0HA/ref=pd_cp_e_0?pf_rd_p=413863501&pf_rd_s=center-41&pf_rd_t=201&pf_rd_i=B0018MFGRQ&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=1ZHAHZCE0G4C2FNTV2C1

Thanks for everyone's help and encouragement.
Post removed 
More to discover