Re: 3577A multiple problems
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? Thanks.?
I¡¯m pretty confident two RAM chips are bad as when I move them the reported fault moves with them.?
I just discovered that I cannot adjust the +15 supply and it is at the high end of acceptable at 15.5 volts. Also there is excessive ripple. Pretty sure it is the LM338K so I ordered a replacement. Also if you watch long enough you see the voltage jump around. The -15 supply is adjustable and very close. I am not confident I have found all power supply issues. Sometimes it takes a few minutes of watching to see something going wonky so it is a slow process.?
I am also seeing oscillator unlock messages as well as bus errors but won¡¯t go after those until I am sure the power supply is perfect.?
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On Dec 14, 2024, at 12:53?PM, dan.meeks222@... via groups.io <dan.meeks222@...> wrote:
? Peter -
No help here, I just wanted to give you a data point: I have had one of these for a long time, and it sits unused for weeks or months between uses, and I have not had any issues.?
If there is something I can do to help you troubleshoot, let me know. I probably don't want to dig deep into the guts or solder anything but if there is something less invasive that might help I am happy to do that.
Dan
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