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futaba pcm 1024 fp-r129dp failure

Old 04-04-2004, 02:04 PM
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sputknik
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Default futaba pcm 1024 fp-r129dp failure

I have a futaba pcm 1024 fp-r129dp that has failed.I checked it a month ago and everything worked fine.I have ruled out the battery and transmitter.I had to replace the antenna wire and had not checked it prior to replacing it.I have excellent soldering skills and didn"t heat the oint excesively.Anybody had a similar problem?Any ideas on what components may have failed?
Old 04-04-2004, 02:10 PM
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mglavin
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Default RE: futaba pcm 1024 fp-r129dp failure

Is your TX modulating in PCM mode?
Old 04-04-2004, 02:48 PM
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Default RE: futaba pcm 1024 fp-r129dp failure

Just checked what u said,and i feel so stupid.That was it.Thanks very much indeed.I was using the radio on aerofly pro and must have switched modes.Thanks again.This is a good example of how valuable this forum is,i was just ready to give up on it.
Old 04-05-2004, 01:05 AM
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Default RE: futaba pcm 1024 fp-r129dp failure

Happens to everyone.
Old 08-02-2015, 11:20 AM
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cap 580
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I have had 2 of these fail and one 138dp fail. I would power the plane on and they have no response. No servo jitter or anything. I tried the crystals in my other planes and they worked fine. What is causing this?
Old 08-04-2015, 08:06 PM
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Truckracer
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Originally Posted by cap 580
I have had 2 of these fail and one 138dp fail. I would power the plane on and they have no response. No servo jitter or anything. I tried the crystals in my other planes and they worked fine. What is causing this?
I would suggest ..... age! These are both older receivers that haven't been available for years. They also used ceramic IF filters and a ceramic discriminator that were prone to failure in certain environments and from excessive vibration. there was also a second conversion crystal that does not plug in and these can fail just like the plug in crystal. Of course, there could be any number of other failure modes. These were good receivers in their day but it is probably time to say bye to them and move on to newer equipment.
Old 08-05-2015, 04:29 PM
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cap 580
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Thanks For the reply. I am glad they didn't fail when flying the planes. That is the part I don't understand.
Old 08-06-2015, 05:43 AM
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Usually, when electronics fail, they fail on power-up or when the load changes, usually an increase. However, they sometimes just quit working under normal conditions, but the most common failure is upon power-up.

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