i suspect it will take the audience about 5 secs to realize I am a novice but I have an interesting problem and would like to see if experts can make a novice into a functional apprentice via the web.
In simple terms: I have a preamp that connects to keypad through a rs485 bus communiction port. My keypad's leds all are on red and the trouble shouting brochure states that this means that i have my rs485+ and rs485- misconnected. However I checked it 10 times and I am convinced that a portion of my preamp was knocked out by a surge. I found two burnt out resistors (toasty brown) and I replaced them. Also 3 optoisolators were in the area of the communications port so I replaced them also knowing that they are surge sensitive. So far all leds are on red and not green which is not good. Near by there is a voltage regulator and a lot of mini capacitors both the round and flat type. I was thinking of replacing the regulator but I was wondering if capacitors could be the problem. I am a novice. I just have a digital multimeter and a plain old soldering iron. I do not own oscilloscope or hot air soldering gun which would help with the smc components. So any takers to this challange? The preamp is an elan z630 and the keypads z100. The only warning is I may be a little slower than the group is use to. But I did take "shocks for jocks" and tools for fools in college
wkaye west palm beach
--------------------------------------- Posted through