Mercedes Benz W126 560SEL 3/89 Testing & Overhaul of Electrical System and All Control Units Part 3

[@cbjodd5878]

Thanks for sharing your expert competence on the mighty 560.
If everyone were like you, there would be peace on earth. (That goes for Clay also.).

[@moestrei]

I found that the 5V rail on these were very noisy. After replacing the 2 brown cylindrical 30uF capacitors (one on each PCB) the controller was functioning again. Same problem on 3 units I had for repairs.