Dennis - I have a PCM90 that has flashing red light at the meters at 0. If I send audio through, I get very loud static/white noise type noise. When the unit works, it sounds terrific. But this makes it unusable. Is this fixable? If so, do you have a video outlining how?
I did the same repair on one of my Lexicons some years ago. It was also an bad ADC issue except the ADC was sending out random data that produced loud white noise when it came out of the DAC. I also got a chip from China... off eBay. Another issue common with these Lexicons as they age is the display gets very dim and you need to replace the capacitors on the back on the display unit.
Since the ADC is mounted on a dip socket from the factory, I suspect that Lexicon thought they may become a problem. The owner has reported back that the unit sounds better than it did before. I suspect that the ADC was on the way out for a while and just recently quit entirely.
This is wonderful Dennis! Very logical and clearly explained. I'm glad to see that you found the problem.
outstanding job. i have a couple dozen of those AD converter chips on hand
Dennis - I have a PCM90 that has flashing red light at the meters at 0. If I send audio through, I get very loud static/white noise type noise. When the unit works, it sounds terrific. But this makes it unusable. Is this fixable? If so, do you have a video outlining how?
Great one, hard to find stuff like this on youtube even today.
Hi Dennis. Is there replacement for adjust and select pots for lexicon pcm 81. They appear to be stripped.
I did the same repair on one of my Lexicons some years ago. It was also an bad ADC issue except the ADC was sending out random data that produced loud white noise when it came out of the DAC. I also got a chip from China... off eBay. Another issue common with these Lexicons as they age is the display gets very dim and you need to replace the capacitors on the back on the display unit.
Since the ADC is mounted on a dip socket from the factory, I suspect that Lexicon thought they may become a problem. The owner has reported back that the unit sounds better than it did before. I suspect that the ADC was on the way out for a while and just recently quit entirely.
Hi Dennis. Do you repair these units? I have a pcm90 that isn't working.
If i sent you (2) Lexicon LXP-5's could u possibly get ONE running? Thank you!
hi, thanks for this. Do you happen to have the place where you ordered the ADC replacement? thanks