Avocet 20 Computer Issue

JoeG · Oct 13, 2016

I have several Avocet 20 bike computers. One works just fine. Two others are giving me headaches!

What I've been doing:

1. Install 386 battery.
2. Set wheelsize calibration to 225 (mph, 26x2.125 tire).
3. Install in mount on bike. Display reads 0 mph.
4. Spin front wheel. Computer display jumps between 4.0 and 68.0. Whether or not the wheel is spinning, and even if it is off of the bicycle. Both "headache" ones do the exact same thing!

If I put the known good computer on while the wheel is still spinning, it reads something like 4-6 mph which is about right.

Anyone have any idea what is wrong or what I need to do differently?

Computer Instructions - http://www.avocet.com/instrpdfs/20.pdf

regan_ev · Oct 15, 2016

Hopefully my suggestion will help as I acquired all the components separately last year (the A20 itself at great expense!) and was desperate to get it all to work. But... I experienced a similar issue with sporadic and erratic speed readings. So I then took some very fine wet'n'dry sandpaper to the contacts which were slightly corroded on both the holder and the back of the computer and it's worked fine ever since.

Good luck, these old Avocets are super cool and need to be preserved!

JoeG · Oct 15, 2016

Thanks for the response. I'l try some sandpaper.

I did try a pencil eraser on the contacts (old military radio mic hack) and maybe that wasn't aggressive enough.

JoeG · Oct 17, 2016

Re:

Tried the sandpaper. It really brightened up the contacts.

But the computers still do the same thing. :?

regan_ev · Oct 17, 2016

Re: Re:

JoeG":2tlsbxdb said:
Tried the sandpaper. It really brightened up the contacts.

But the computers still do the same thing. :?

Ahh shît

Shayne · Oct 19, 2016

Have you tried cleaning up the contacts for the battery?

JoeG · Oct 19, 2016

Have you tried cleaning up the contacts for the battery?

Yes; with a pencil eraser. They're tiny, and the metal is quite thin, so I'm hesitant to do anything hard to them. Good idea, though.

itscervo · Oct 19, 2016

Well there's only one left too try

. That is to tremove those 3 screws, that they tell you not to remove :twisted: & check the circuit board for corrosion.

Avocet 20 Computer Issue

JoeG

Retro Guru

regan_ev

JoeG

Retro Guru

JoeG

Retro Guru

regan_ev

Shayne

Old School Hero

JoeG

Retro Guru

itscervo

Retro Guru

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