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Printed Circuit Boards


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  #11  
Old 04-08-2017, 12:24:15 AM
TLB01 TLB01 is offline
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Default Re: Printed circuit boards

Well, it is good to see a good healthy cottage industry repairing these PCBs. They are much different from integrated circuits that really can't be salvaged. I just bought a YD end MDJC for "parts" and was amazed at how simple the regulator board was. If the YD end unit runs (Supposedly low hours set from a Hatteras that burned and it is definitely low hours from visual) ...well, its not parts anymore. Until then, it doesn't get a thread. Its a salvage yard rescue.

Thing is if you have a good soldering iron and a suction bulb with a bit of electrical acumen, you can save these old boards. The printed circuit paths are much more robust and less "busy" than what you see now.
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Old 04-08-2017, 12:38:25 AM
Archaeometrist Archaeometrist is offline
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Default Re: Printed circuit boards

I'm running into this stuff with a brain board out of my wife's 2007 Ford Taurus (that she inherited from her dad). It's gone out (two cylinders not firing - tested and it is the brain, as well as the already replaced coil pack) and I went to buy a replacement brain from a local parts house. They weren't too easy to talk with, and suddenly I was being told I had to buy the thing for over $350, and take it (with the old one) to the dealership to be programmed, otherwise it wouldn't run right - and pay the dealer to reprogram it (and there was a core charge too). I talked with a couple of mechanics I know, and they said that Ford would not program it - wouldn't even touch something from another company and that I would have to buy a new computer from them - and then they'd charge three or four times what I would pay for it at the parts house AND charge to program it. With the way the local parts store is, I probably would also have a lot of trouble returning the unused brain and getting a refund too. (They advised me to check out a couple of other parts dealers, and I did.)

I found another source which also will have the one they sell programmed, for only a little more than the parts house I'd originally gone to. Her car may be down for a couple of days, but we can live with that.

I'm hearing more and more about things like that - and people in the stores getting mad at me because I can fix things myself and don't want the service contracts and so on that they push on top of the prices they demand.

My wife said last week that she wished we could go back to the Model T, because at least it could be easily fixed by more ordinary people. I tend to agree - except I do appreciate new materials which last a lot longer and are more rugged. The prices they charge for brain boxes are outrageous - unjustified and unjustifiable. The way they treat customers who don't have money to throw away - even worse.
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Old 04-08-2017, 12:39:40 AM
TLB01 TLB01 is offline
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Default Re: Printed circuit boards

Florida. Salt air. Molex connectors. Get under your hood, start pulling connections and find the one that has black mush where a pin connector seems it should live.
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Old 04-08-2017, 12:53:43 AM
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Default Re: Printed circuit boards

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Originally Posted by TLB01 View Post
Thing is if you have a good soldering iron and a suction bulb with a bit of electrical acumen, you can save these old boards. The printed circuit paths are much more robust and less "busy" than what you see now.
My second laptop was a repair - a surface mount switching transistor had gone out and I replaced it (simple if you know what to do). That was back in the '486 days. The first laptop was an 8086 LCD screen DOS system (slow) that nobody could fix - but I did. All socketed ALS ttl chips - and loved to drain batteries (ancient Kaypro).

I also had a 20Mb hard drive (back when that was fairly big) that had a bad head - I carefully opened it up, bent the bad head back from the platter, put it back together again, reformatted it to ignore the bad head - and ran it that way for two years. It was given to me because of the bad head - and saved me a bundle when I didn't have it. (Laugh) My computer was all scrounged parts, some of which had been repaired after being scrounged. It worked fine although nowhere near as fast as 'new'. I probably had at most $20 in the whole thing.

Even the more 'difficult' devices can sometimes be saved, if you know what you're doing and are careful. It's how we've survived. (Laugh) bailing wire and duct tape - that's for people who have resources!
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Old 04-08-2017, 01:01:21 AM
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Default Re: Printed circuit boards

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I just repaired a CMQD 7500 HDKAT. The Inverter was dead shorted control power, a replacement inverter goes for about $2K online. Cost $1.44 for a new MOV , , the Red gismo in the pic, exact same part which I soldered in, it was the only thing which showed signs of overheating but the generator was condemned without it . Control power was dead shorted by it, would blow the fuse instantly. Works fine now, I wonder how many other inverter gens were scrapped because of this simple part failure. I have also repaired Onan YD voltage regulators with a few components but found that since all the other components on the board were 25 yrs old too, failure was a frequent occurrence just in a different place. Cheers Dan
Dan, What is a "MOV?" I ask this because My best friend is full time in his 2004, 36 ft Alpine MH and it has an Onan 7.5 diesel inverter and from being on the coast of Washington State. I cringed a bit when I saw the guts in the set. That part you replaced looks like an old style capacitor.
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Old 04-08-2017, 01:01:38 AM
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Default Re: Printed circuit boards

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Florida. Salt air. Molex connectors. Get under your hood, start pulling connections and find the one that has black mush where a pin connector seems it should live.
If the reply is to me - Florida yes, Black mush no. (Already checked and eliminated that possibility.)

What I think happened is that a spark plug wire was going bad (due for replacement) - arced to the lead coming from the brain box, which destroyed the switching transistor. I suspected that there was something going on but with all we're dealing with, didn't have the time to stop and work on it back then.

You know how everything likes to hit at once!
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Old 04-08-2017, 02:31:27 AM
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Default Re: Printed circuit boards

A MOV is a metal oxide varistor, it clamps the voltage coming in to protect the circuitry from damage . They are a cheap way to protect the board. If the voltage increases beyond a certain point it triggers and shorts . If it gets hit too often it shorts permanently. Cheers Dan
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Old 04-08-2017, 06:49:47 AM
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Default Re: Printed circuit boards

my generator has relay logic, I can fix that!

my late friend could fix direct coupled PA amplifiers.
but he had a crib sheet of what fixed what.
info earned over many years of fixing the same models.

others with greater understanding can go right to the up stream problem.

juke boxes all over the St Louis MO area are safer today
as the most noted repair butcher has gone into a nursing home

Seeburg KD models were built with pc boards that had a bit too much affinity for H2O
this did not work well with 450VDC B+ and magic smoke got out
also the edge connectors failed under heavy 6.3 VAC loads

Seeburg went back to hand wired until well after the move to transistors.
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Old 04-08-2017, 07:07:49 AM
Gunny Gunny is offline
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Default Re: Printed circuit boards

Amen to what Billy said. Flight Systems. Those folks are the greatest.

Long ago, the Marine Corps, in their infinite wisdom, sent me to Electrical Equipment Repair school in Camp Lejeune. Part of the course was trouble shooting and repair to printed circuit boards. Has served me well through the years, even fixing boards that appeared to be trash. Surface mount, well, eyes getting old and not as steady with the hands any more so leave that to the young guys.
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Old 04-08-2017, 12:19:23 PM
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Default Re: Printed Circuit Boards

Gunny, Do you have someone younger to pass on your skill to? I am working with a kid that lives close to me and showing him some of my skills on diesels, carburetors, and other automotive issues.
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