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'91 745 Speedo Troubles 700

posted by  RobCooper on  Sun Jan 24 17:35 CST 2010
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last visit: Tue May 13 17:31 CST 2014
[RELATED]

I just fixed mine 2nite!

Did all the capacitors, I mean all. Plus you need to retrace the circuit board paths due to the acid from the leaking capacitors.

This was hard because it was really hard to remap the board without knowing the original path. Turned out I needed to bridge a wire from one IC leg to a capacitor point.

The only way I knew the way was by comparing it to a good board.

Also, the tach needed a new 6.8 micro F capacitor. Fixed it!

One thing I learned is a good DMM meter can check the capacitor reading. GO THRU EACH ONE AND TEST THEM! A LEAK IS NOT THE ONLY SIGN.

Highly recommend taking the speedo apart by turning the dial counter clockwise and popping it of. Reset it with the needle at the k in km/hr at full clockwise spin. Take the odometer motor off and zip tying it to the board so it doesn't flop around. Just unsolder the 2 service light switch wires.
Very easy.

Now my speedo and tach work!






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