[time-nuts] SR620 Problem

[Alexander Pummer]

how fare are you familiar with electronic equipment troubleshooting? 
could you find components, test points if somebody would ask you for 
that? do you have some electronic test equipment e.g. multimeter, 
oscilloscope? --last year I helped somebody to fix one HP high-frequency 
generator just per e-mail back and fort and he was able to fix the 
equipment, if you are interested let me know

Regards
Alex

On 8/29/2016 4:41 PM, Don at True-Cal wrote:
> Sure, my original post ask for anyone in the US as I live in Springfield Missouri but I will be happy to ship anywhere in the states. I have the complete schematics for the unit. Was hoping to find someone specializing in SRS equipment or already having repair experience with the SR620.
>
> Regards,
> Don
>
> -----Original Message-----
> From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Tom Miller
> Sent: Monday, August 29, 2016 4:37 PM
> To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
> Subject: Re: [time-nuts] SR620 Problem
>
> You might say where you are. Maybe someone lives close that can assist you.
>
> Regards,
> Tom
>
> ----- Original Message -----
> From: "Don at True-Cal" <truecalservices at gmail.com>
> To: "'Time Nuts Group'" <time-nuts at febo.com>
> Sent: Monday, August 29, 2016 5:17 PM
> Subject: [time-nuts] SR620 Problem
>
>
>> Hello All,
>>
>>
>>
>> Sorry if this is a repeat but not showing up in my sent mail. Changed the
>> list address slightly.
>>
>>
>>
>> I'm looking for someone that has repair experience on the SR620 TIC. I
>> have
>> a failed unit that has previously worked perfectly for many years while
>> running continuously on my lab bench. The failure occurred after a very
>> dirty mains power failure during a storm. There was no other evidence of a
>> severe lightning strike so I suspect just a major power line glitch. I
>> have
>> a second unit so time to repair is not critical. I have checked and
>> confirmed all of the power supplies and eliminated all of the easy fix
>> scenarios already. The major symptom is absolutely no display of
>> indicators
>> or readout (unit looks to be off), -DROPOUT form the PS is ok. I believe
>> the
>> loss of LED and display is from the processor stopped U131B flop. I don't
>> have sufficient confidence, let alone spare IC to delve into the processor
>> chain. Is there someone in the US with this experience that I can send
>> this
>> unit to for repair. Being retired and all this just being a major hobby
>> makes repair cost a big concern.
>>
>>
>>
>> Regards.
>>
>> Don J.
>>
>>
>>
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