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fixed it! I am OK 700 1992

posted by  RobCooper on  Thu Jan 28 18:24 CST 2010
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last visit: Tue May 13 17:31 CST 2014
[RELATED]

I am now successful in fixing both my 91 and 92 speedos in the last two weeks.

Replace all the capacitors per FAQ link. If you can't get all of them, them just get what you can at Radio Shack. Do the 220 micoF one.

Clean that board well with electrical contact cleaner. Get a toilet paper roll and cut a little strip to fit under the two IC's. Soak it with cleaner and clean under the IC. Clean between the IC legs.

Check all circuit paths for continuity with a DMM. Note the circuit paths are different on each side. It really helps to hold the board up to a strong light to see the paths. Check them for corrision damage. I had to jump one with a small wire from the 7th leg of the IC to a capacitor leg b/c the path was burned thru from capacitor acid.


I went thru and re heated all the solder points. Careful with to much heat!

To disassembly the board for access, twist the needle off CCW over the stop pin. (reinstall so it stops CW on the K at KM/hr. Desolder the Service light wires from the board. Unscrew the odometer motor and zip tie the motor worm gear to board where the ribbon is attached to the board. I did this to keep the motor from pulling on the fragile ribbon.

Remove the 2 screws towards the center. Not the ones centered between the speedo pins (those remain in place)

Get a small pen solder gun and if you need some solder for touch up.

Getting the cap's off is done by staggering the cap side to side as you hit each leg pin from underneath as the solder breaks from the heat. They will slowly walk off the board. Reintall in reverse. Strip side of a cap is negative! Get the polarity right. Make a picture of the existing cap's. Cut the new cap's legs so they are not so long.

I will tell you that getting the clock connector off the back of the cluster was a bitch. The two prongs don't give up. Get a little flat head to help pry them open as you pull. Bend them away so if you need to remove again it is easier.

The turbo hose is weird. I pryied mine off from the brass nipple out the back of the cluster. Just get a flat hear under the angle adaptor and work it off.

Please undue the battery! To prevent a short.

If you never took the cluster out, there is a white security clip on the 4 pin connector behind the speedo. It breaks so don't worry.

I can do this job now in my sleep after dicking with it so much

Thanks BB!

Rob






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