Alfa Romeo CControl - Alfa Romeo Bulletin Board & Forums

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Old 06-25-2006, 03:43 PM
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Alfa Romeo CControl

Hello.

Does anyone have an Alfa Romeo Control unit to check something for me?



The loose diode, I am going to solder it back on, but I dont know which way it is supposed to be mounted. Can anyone check this for me, please?

Edit: The car is an Alfa Milano (75) 3.0 (1991).
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Old 06-25-2006, 04:29 PM
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Can't quite see clearly due to the angle of the pic, but isn't there some symbology righ near where the broken solder points are?

If so, it may be what indicates the correct direction of current flow. (a trip to the local electronics shop should turn up someone who can tell you which direction it points if so)
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Old 06-26-2006, 12:25 AM
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G'Day ???,

Ican't really help you as although I have 3 ARC's they are the smaller version and certainly don't have a diode that size.

Which brings up some questions,

Why did it fall off?
Did it get hot and melt off?
Is it dead?
Are you sure it is the correct diode?
The holes in the board don't look big enough for the leads on that diode.

If it's not correct, someone replaced it before, Why?

Follow the tracks and see where each end goes.


Oh, and if possible I would really appreciate photos of both sides of all circuit boards.
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Old 06-26-2006, 05:03 AM
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more pics

hello and thanks for the replies!

Here are some more detailed pictures:


A more detailed picture of the frontside

I cant see any indications of which way the diode is supposed to mounted. No dots or anything like that.


The backside (note the red arrows point to where the diode was mounted)

The reason it fell off is unclear, but I think it is because of overheating. I am having trouble with having alternator charging the battery, and I think (hope) this is the problem.

The reason why the holes are so small is that there is still som soldering iron left in the holes.
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Old 06-26-2006, 01:10 PM
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I think to be safe you will need to replace the diode, it looks like a P600x.

P600's come as P600A, P600B, P600D, P600G, P600J, P600J, P600M. any of these would do.

What colour wire does the track I have indicated go to?
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Old 06-26-2006, 01:45 PM
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I have seen lots of bad solder joints like these over the years, they are caused by the heavy leads of the diode heating and cooling slower than the thin coper traces they are soldered to, this causes a stress in the flow solder process that weakens the connection, they eventually fall out or just go intermittant.
cliff
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Old 06-26-2006, 02:51 PM
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Quote:
Originally Posted by Craig
What colour wire does the track I have indicated go to?
Brown with a white (possibly bright yellow) stripe.
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Old 06-27-2006, 12:22 AM
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Quote:
Originally Posted by milano-guy
Brown with a white (possibly bright yellow) stripe.
Ok, Brown White (Connector 'E' pin 12) thats come from the ignition switch (start position).

I would guess the diode would be connected as in this pic but would need to know where the other end goes to be sure.
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