w116/w126?? cruise control amplifier

What jerks they are for charging $350 for an exchange unit or $500 for a new one, when its a $2.50 transistor that fails that anyone with basic soldering
skills can change..
Its the biggest transistor in there, they tried to use the plastic housing as a heatsink - yeah, that really works... installed long leads to it - used heatsink compound and screwed it to the aluminum can case - its never going to burn out again.
Although, possibly some of the smaller transistors may blow sometimes or the one large relay in there..... still, theres less than $50 worth of parts in there all told and its certainly not rocket science to repair, classic massive 70's tracks, single layer etc...
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new
soldering
used
going
the
in
You have to know which transistor to replace. This place is only $185.
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its not hard to desolder them and test them one at a time, takes all of 15 minutes. but if you've got a spare $185 that you wounldnt like to spend on something else, sure go ahead :)

housing
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Adsit Company has rebuilt ones for $179 online. I bought one from them years ago and it's till working fine
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Good for you!!.
It aint rocket science till it gets to surface mount stuff. Biggest problem with some of this older gear is that they do occaisionally use germanium transistors, that are getting hard to source. Also, being hand made (BOSCH used to have rooms full of gels building their electronic gear in those days) means that they are all slightly different, or have components substituted for 'variants'.
You can usually test transistors without removing them with a bit of practice and an idea what you are looking for... oh and a meter as you suggest. A de-soldering tool is a good investment for a couple of bucks too, along with the iron. It makes getting parts out much easier.
Keep up the good work!
Cheers... Rob.

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