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Old engine analyser - electronic restoration

edited March 1 in Articles & Guides 5966 / 335joined Jul 2013
I picked up this engine analyser.

m3sBdxzh.jpg

Some functions (like battery voltage) worked, and other (like tach and dwell) did not work. I suspected that this would be the case, so naturally I opened it up.

67aQ41Eh.jpg

5zyl2MRh.jpg

Aha, look at that! Dried out electrolytic residue. Blown caps. So two 330uF caps are in my future.

Turning it over, more carnage - some of the trace has actually peeled away from the PCB!

k3epGuYh.jpg

Because the damage to the trace is so extensive, rather than trying to repair it, I'm simply going to run bridge wires from the most convenient component terminals.

Stay tuned!
bgpzfm142

Comments

  • 2551 / 54joined Apr 2014
    You can. Bit in the mean time, you can run silver paint pen (electrical contact pen) you can draw your own electrical circuits on paper and they work :)
  • 5966 / 335joined Jul 2013
    I know, but that's actually more expensive than just repairing it properly :P
  • 5966 / 335joined Jul 2013
    So parts list is two 330uF capacitors. $1 to spend. Other components MIGHT be fried, but we'll see. I'm pretty sure I could recreate this circuit from scratch on breadboard if need be.
  • 221 / 20joined Jan 2016
    At least its not surface mount!

    The impact on the traces can be a bit like rust. Have fun.
    bgpzfm142
  • 2551 / 54joined Apr 2014
    $7 for a pen if your interested
  • Vee_QueVee_Que (@Vee_Que) South Eastern suburbs Melbourne.
    edited March 1 5880 / 25joined Jul 2013
    Not really the different to my jaycar digital multimeter which was 60 iirc, dwell etc with it, even my $30 one does that fwiw.

    But interesting.
    bgpzfm142
  • 5966 / 335joined Jul 2013
    Oh yeah I bought it because it's old school cool. @blondejay I don't need a pen, I already have all the stuff I need to repair it. Had to spend $1 on new caps, which I picked up just now.

    wNcMoQ6h.jpg
  • 7585 / 64joined Jul 2013
    Jaycar at town hall?
    I think you need to add i was in an s80 with three wheels getting pulled backwards and was told to "hold on shit is about to get real".
  • 5966 / 335joined Jul 2013
    Yup
  • edited March 2 5966 / 335joined Jul 2013
    Traces in, epoxy sealing it all. Will test the unit out tomorrow.

    nHn9w8mh.jpg
  • 5966 / 335joined Jul 2013
    Dwell meter is working!

    jhTirmQh.jpg

    Tach mode still isn't working, but there's some components to do with that, that I didn't replace, so I may do a bit more work yet.
    sucksqueezebangblowbgpzfm142Ex850RVee_Que
  • nickmnicko (@nickm) Sydeneee --- home of the traffic jamb, over priced coffee, and the 2000 Olympics
    1972 / 27joined Jul 2013
    set the dwell angle ... or put a contactless system in there
    try a sig
  • 5966 / 335joined Jul 2013
    set the dwell angle ... or put a contactless system in there

    Ye of little faith
    bgpzfm142
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