Re: TDS684C won't boot up - front panel lights stay on


Ryan Scott
 

An update.  I pulled the front panel assembly and took a look and like I said earlier, nothing seemed out of place.  I did notice some crud around the scale encoders.  Perhaps someone used some contact cleaner on it?  Cleaned it with IPA and after 2 power cycles, it's booted just fine off and on for the last week.  Not really sure what to make of this.  It was 'scrapped' at my work from a remote design center as 'unrepairable'.  The back cover (collar) was missing so it's obvious someone was into it.  From the limited troubleshooting guide I found, everything pointed to the front panel.  The clock signal and all PS voltages were present.  The only thing I can think of is whatever someone may have used to clean the control or whatever crud I found was leaky and causing the boot sequence to hang?  
So far I've ran it through various exercises and it's all good. It's a great scope.  So I guess I'm going to run with it.  
Question:  It takes about 30 sec to boot up.  Front panel lights, then screen flashes, then a 'clock' then clicking followed by the starting screen saying it's passed the power on self test.  
Is this a normal boot time?  (I'll verify it on a 784 at work tomorrow)
Thanks for the time guys.

On Friday, February 13, 2015 8:42 AM, "acuffe@... [TekScopes]" <TekScopes@...> wrote:


  I would start by going over the power supply for obvious problems. Even though the SMD caps aren't leaking, it wouldn't hurt to check them for ESR if you can. The caps could have dried out if it was used or stored in a hot location.

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