Finding the unknown resistor

[da_ardvark]

Hi all,

I've not posted in a while, and true to form I'm going to ask a question that I almost know won't be able to be answered. That said, here goes.

I have a board that I know I need to replace a fried resistor. Problem is I don't know the value. I called the manufacturer with less than desirable results. I also know that some other stuff may be fried, but first things first.

Now to the question.....

Is there a way to make an educated guess as to the value that I should try? Can I look at the voltages necessary down circuit to make these guesses?

Thanks in advance for any response.

Love Denny :grin:

 

[JohnRoberts]

Sure if you know what the rest of the circuit values are... An engineer had to figure the value once, so it can always be done again, maybe better.

JR

 

[drpat]

What piece of gear is it? You may have luck finding schematics from somebody here if they know what the gear is. I had he same problem with an expensive compressor that was down for a year, because the company would not sell the schematics to me. Somebody e-mailed me a copy, and it was back in service the next day. It's worth a try...

 

[da_ardvark]

Thanks for the replies. The gear is not really worth fixing except for the fact that I enjoy the challenge. It's a car radio (CD MP3 etc.)

I'll try to analyze the circuit as best I can and see what happens.


Thanks again :grin: