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Radiosrfun

"Arfa Daily" wrote in message
...

"Radiosrfun" wrote in message
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"robb" wrote in message
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"Don Bowey" wrote in message
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On 9/9/07 5:00 PM, in article ,
"robb"
wrote:

"Don Bowey" wrote in message
...
On 9/9/07 12:09 PM, in article ,
"robb"
wrote:

The only thing that will make a difference is you posting a
schematic.

well if i had a schematic i would surely post it instead of circuit
board
pictures.

i was hoping some one might notice the chips used and there
configuration
and maybe have an idea about how and what to look for.

thanks for help ,
rob

you could make a list of the Ics on the board and download all the
datasheets for them. That should help you.

Hey Don,
I realize i am not even an electronic hobbyist more like a "dangerous
adventurere" at best when it comes to repairing electronics (i have
succesfully stripped 10 guage wire and i can distinguish resistor from
diodes most of the time)

but, how would looking up all the IC datasheets help ?

would it not be more efficient to concentrate only on the ICs directly
connected to the suspect components ?

thanks for your time,
rob

If you look up the "Data sheets" of those ICs - you can see what their
actions are "supposed" to be - and see if anything is failing to do it's
particular job. You can analyze the outside parts all you want - if a
Chip is failing - you won't know it without the data sheet and way to
check it for input/output. If you have an "input" signal to one of the
chips - but no output - then it isn't working. Not being able to
understand the action of those chips on that board - can leave you
scratching your head a while - and maybe running in circles looking.
Checking all the traces, switches, whatever - isn't a bad thing - but it
won't uncover a dead IC - especially if you have tunnel vision - not
wanting to accept it "may" be a chip. I'm not suggesting it "is" a chip -
but the suggestion offered couldn't hurt. You will have a much better
understanding of the "intended" performance of the circuit. Chips "can"
go bad.

Here's a good one that has stood me in good stead for years. The more pins
a chip has, the less likely it is to be faulty ... !!

Arfa

Don't think I ever heard that one!