Re: [time-nuts] If your 5335A is acting goofy or dead...
Update. I replaced the relay socket anyway with a 27E213 from Digi-Key. It fits perfectly. The socket I removed was a 27E129. It would seem that the 27E129 should have a ground strap. The one I removed doesn't. Otherwise, the 27E213 should be identical. The Digi-Key part number is PB806-ND. Although the bad contact with the socket caused enough heat to discolor the base of the relay, I don't think the relay was harmed. I also did the extra wiring from the service note to add a second set of contacts in parallel for the 5V supply. Hopefully this problem is fixed for the next decade or two. Orin. On Sat, Dec 27, 2014 at 9:06 PM, Orin Eman orin.e...@gmail.com wrote: While evaluating my LTE Lite and testing my buffer board, my 5335A started acting goofy - random hangs/crashes etc.. This morning, the fan came on, but no display. To make a long story short, the problem was exactly as described in Service Note 5335A-26B. I found evidence of overheating on the power supply relay. The 5V (and 3V) supply was down. During investigating the fault, I disturbed the power supply relay and reseated it. The instrument worked again. Further investigation revealed a cold looking solder joint on the relay socket and spread contacts on the relay socket. About 1V was dropped across the relay socket and the relay itself. I resoldered the socket and 'persuaded' the contact with a small screwdriver. All now seems to be back to normal. FWIW, do not believe the part number on the relay. It is really a 6PST NO beastie for which I have not yet found a replacement. The above mentioned service note adds a second pair of contacts for the 5V supply after replacing the 120V fan with a 24V fan fed from the power switch. This uses the relay contacts that used to be used to drive the 120V fan. Ideally, you replace the relay and its socket as well, but good luck finding the relay. My unit has the 24V fan, but I have yet to do the rewiring for the second pair of contacts, so I suspect the fix might not last. Still, it's 22 years since the date on the service note, so I might have a few years. So, if your 5335A fan comes on, but no display, check the 5V supply first and if it's down, suspect the power supply relay/socket. Orin. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] If your 5335A is acting goofy or dead...
Magnus, The service note is attached. Orin. On Sun, Dec 28, 2014 at 8:04 AM, Magnus Danielson mag...@rubidium.dyndns.org wrote: We had that issue with the 5335A at work, and replacing the relay did the trick. 5335A is still the counter which is easiest to use, even if it doesn't have stellar performance, but usually that is not needed. Where did you find the Service Note? Cheers, Magnus On 12/28/2014 06:06 AM, Orin Eman wrote: While evaluating my LTE Lite and testing my buffer board, my 5335A started acting goofy - random hangs/crashes etc.. This morning, the fan came on, but no display. To make a long story short, the problem was exactly as described in Service Note 5335A-26B. I found evidence of overheating on the power supply relay. The 5V (and 3V) supply was down. During investigating the fault, I disturbed the power supply relay and reseated it. The instrument worked again. Further investigation revealed a cold looking solder joint on the relay socket and spread contacts on the relay socket. About 1V was dropped across the relay socket and the relay itself. I resoldered the socket and 'persuaded' the contact with a small screwdriver. All now seems to be back to normal. FWIW, do not believe the part number on the relay. It is really a 6PST NO beastie for which I have not yet found a replacement. The above mentioned service note adds a second pair of contacts for the 5V supply after replacing the 120V fan with a 24V fan fed from the power switch. This uses the relay contacts that used to be used to drive the 120V fan. Ideally, you replace the relay and its socket as well, but good luck finding the relay. My unit has the 24V fan, but I have yet to do the rewiring for the second pair of contacts, so I suspect the fix might not last. Still, it's 22 years since the date on the service note, so I might have a few years. So, if your 5335A fan comes on, but no display, check the 5V supply first and if it's down, suspect the power supply relay/socket. Orin. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/ mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/ mailman/listinfo/time-nuts and follow the instructions there. Service Note 5335A-26B.pdf Description: Adobe PDF document ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] If your 5335A is acting goofy or dead...
We had that issue with the 5335A at work, and replacing the relay did the trick. 5335A is still the counter which is easiest to use, even if it doesn't have stellar performance, but usually that is not needed. Where did you find the Service Note? Cheers, Magnus On 12/28/2014 06:06 AM, Orin Eman wrote: While evaluating my LTE Lite and testing my buffer board, my 5335A started acting goofy - random hangs/crashes etc.. This morning, the fan came on, but no display. To make a long story short, the problem was exactly as described in Service Note 5335A-26B. I found evidence of overheating on the power supply relay. The 5V (and 3V) supply was down. During investigating the fault, I disturbed the power supply relay and reseated it. The instrument worked again. Further investigation revealed a cold looking solder joint on the relay socket and spread contacts on the relay socket. About 1V was dropped across the relay socket and the relay itself. I resoldered the socket and 'persuaded' the contact with a small screwdriver. All now seems to be back to normal. FWIW, do not believe the part number on the relay. It is really a 6PST NO beastie for which I have not yet found a replacement. The above mentioned service note adds a second pair of contacts for the 5V supply after replacing the 120V fan with a 24V fan fed from the power switch. This uses the relay contacts that used to be used to drive the 120V fan. Ideally, you replace the relay and its socket as well, but good luck finding the relay. My unit has the 24V fan, but I have yet to do the rewiring for the second pair of contacts, so I suspect the fix might not last. Still, it's 22 years since the date on the service note, so I might have a few years. So, if your 5335A fan comes on, but no display, check the 5V supply first and if it's down, suspect the power supply relay/socket. Orin. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] If your 5335A is acting goofy or dead...
While evaluating my LTE Lite and testing my buffer board, my 5335A started acting goofy - random hangs/crashes etc.. This morning, the fan came on, but no display. To make a long story short, the problem was exactly as described in Service Note 5335A-26B. I found evidence of overheating on the power supply relay. The 5V (and 3V) supply was down. During investigating the fault, I disturbed the power supply relay and reseated it. The instrument worked again. Further investigation revealed a cold looking solder joint on the relay socket and spread contacts on the relay socket. About 1V was dropped across the relay socket and the relay itself. I resoldered the socket and 'persuaded' the contact with a small screwdriver. All now seems to be back to normal. FWIW, do not believe the part number on the relay. It is really a 6PST NO beastie for which I have not yet found a replacement. The above mentioned service note adds a second pair of contacts for the 5V supply after replacing the 120V fan with a 24V fan fed from the power switch. This uses the relay contacts that used to be used to drive the 120V fan. Ideally, you replace the relay and its socket as well, but good luck finding the relay. My unit has the 24V fan, but I have yet to do the rewiring for the second pair of contacts, so I suspect the fix might not last. Still, it's 22 years since the date on the service note, so I might have a few years. So, if your 5335A fan comes on, but no display, check the 5V supply first and if it's down, suspect the power supply relay/socket. Orin. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
