Merc 1982 500SEC No spark

Anyone experienced in the electronic ignition on The Merc 500 SEC.
It just cut out and stopped and I'm making the assumption its in the little box.
I have no spark and when the "black" box was opened it smelt like something has been getting hot. They have a Bosch electronic box.
What I would like to know is how repairable are these things and can you buy parts or would anyone have a circuit diagram.
thanks
r
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Don't forget about Crank Position Sensor. Considering the cat is 25 years old... it is time.
The electronic ignition box is usually common cause... sould be by the coil... Silver but I am not sure on your car.
I would start out with CPS first.
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