1986 300SDL: CCU parts list?

[TonySz]

Anyone have a parts list or schematic for an 86 300SDL CCU? I'm going to rebuild mine but some of the transistors' #'s are unreadable. I've already replaced all the capacitors in mine and am building a list of parts as I go but any help would be great, greatly appreciated. Thanks.

[tinypanzer]

Personally, I wouldn't bother replacing the transistors unless you know they have a problem. When you did the caps, I hope you used hi temp (85c or higher) capacitors of a very good brand such as Panasonic or Nichicon. Regular cheap electrolytics will probably not last.

I've never studied the circuits inside the CCU up close, but I would not be surprised to learn that there are a lot of close tolerance parts in there, and possibly matched components. Replacing anything other than caps might be an exercise in futility, or worse.

[TonySz]

Originally Posted by tinypanzer

Personally, I wouldn't bother replacing the transistors unless you know they have a problem. When you did the caps, I hope you used hi temp (85c or higher) capacitors of a very good brand such as Panasonic or Nichicon. Regular cheap electrolytics will probably not last.

Yeah, I know about the caps. I haven't done the transistors yet but I am done with all the diodes.

Originally Posted by tinypanzer

I've never studied the circuits inside the CCU up close, but I would not be surprised to learn that there are a lot of close tolerance parts in there, and possibly matched components. Replacing anything other than caps might be an exercise in futility, or worse.

I've done circuit work before so it's not a major hassle for me. There are guys out there refurb'ing them so it's doable. Digikey and Mouser have all the parts so far and I have a few other places for hard to find parts. We'll see how it goes.

[Hit Man X]

I have used Digikey in the past when rebuilding weird items... Servotronic steering in my 750iL for example.

As for a second gen climate head, just look around for a good used one. You can get it for less than $50 usually, surely your time is worth more than $50.

[redassag00]

Originally Posted by Hit Man X

surely your time is worth more than $50.