BobbyBalsa

although I'm an electronics technician , I can't fix my Multiplex Pico 5-6 receiver . I've already changed the CD4017 C-MOS demuxer . Problem: servo jitter at CH1 output . Someone has a schematic ?

00hex

You could poke at it a bit with an oscilloscope if you have one. The raw PPM data goes into the Clock pin on the 4017 (pin 9 on the SMT version I think), and the Reset should trigger once every data frame. You could also check any nearby resistors and capacitors.

If you can't find anything it might be time to just send it in to be fixed.

BobbyBalsa

Thanks a lot for the tip ! I'll try it out as soon as possible and keep you informed . If you like I can send you some digital scope graph's . Sending this item to a repair shop has the same price label as buying a new item , so if there's an RF problem it will be " phasing out " !
Lots of greetings from Belgium , thanks again !

DavidO

Is it only ch1 that jitters ?
Is channel 1, first out of the pulse train (No1 output from the receiver block connector) ?
DavidO

BobbyBalsa

It's indeed channel 1 , all other channels were ok that's why i changed the CD4017 .

Rodney

Have you checked it out with another receiver? If not, it could be your transmitter having a noisy or dirty pot on channel 1.