Help me fix my Super slim rx plz!

[Wobit]

Hi all.

This receiver was in a plane that I had not flown in a while. Out of the blue it became non-operational. It has not been in any crashes what so ever.

I have opened it up, and have found ‘ways’ to get it working:

1. touch finger over the pins on circuit board. It sometimes will work later after I take my finger off it.
2. put end of screw driver (slightly magnetic tip) about 1” from circuit board. This works most of the time.
3. move tx away from it. Some positions it works/does not work. It takes step 1 to get this working first.

Step 1 always seems to work.

Jiggling it about without touching the board does not work. The rx was bought in 2002, and has had little use.

I am intending to get this rx fixed DIY with the help of your input. Getting it fixed by hitec is out of question – it would probably be cheaper to buy a new rx! I am in New Zealand, Wellington.

If I get it fixed I intend to run it in a s400 pylon type plane.

Robert

[vintage1]

I would say you probably have an aged crystal. Start off by replacing that. Sounds like its only just oscillating when 'prodded'

[Wobit]

thanks for reply vintage,

I forgot to mention that i have tried another crystal, which i know works with my supreme rx.

Ill test this again, swap crystals etc.

But wouldnt giving it a shake about without touching circuit board (by holding antenna) alleviate this if so?

[Wobit]

Hi again,

I have put in a crystal that i know works 100%. So i eliminated the possible problem with the external crystal (but not the internal one/s).

I have had a go a making it work with cover on, no luck. However when i put some strong neodymium magnets close to it (hard drive ones) it will work. I am not prodding it or touching it with finger etc.

It will not work when the magnets are close and the transmitter is more than 3m away.

What is this magnetic field affecting?

It does not sound like it is connecting a dry joint (other than the internal crystal) because it would work normally otherwise with range? Does this suggest the problem lies with the internal crystal/s?

Could someone kindly explain/direct me to info, how a crystal works, what is inside, and how it is affected my a strong magnetic field.

Robert

[Acetronics]

Hi,Wobit

I also have some "aged" receivers ... they need some trimming after a while ... not very easy to do without a scope.
easier solution is to contact the Hitec after-sales service ...if possible.

Other solution is to contact HAM enthusiasts or R/C Labo equipped people ... they know what to do and How to do it reliably.

DO NOT TRY to do it yourself ... result would be worse !!!

Alain

[Daniel7866]

Hi Wobit,

I have had a similar problem on a Super-Slim. Touching parts around local oscillator get it worked. Culprit was a SMD 22pF capacitor.

Daniel