[time-nuts] SR620 Problem
alexpcs at ieee.org
Mon Aug 29 18:42:22 EDT 2016
Hi Tom, do you have circuit diagram for the unit?
On 8/29/2016 2:37 PM, Tom Miller wrote:
> You might say where you are. Maybe someone lives close that can assist
> ----- 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
>> 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
>> 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
>> have sufficient confidence, let alone spare IC to delve into the
>> 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.
>> Don J.
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