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'SRAM failure +WD Reset' on Gemini 1

Simon Kidd All Messages By This Member #32895 Hi All, Happy New Year! Its not started well for me I'm afraid!? I have a quite old G1 (DIN motor connectors but with slide switch on/off) and it has worked perfectly for a very long time, with frequent use. However, tonight I fired it up and it immediately showed 'SRAM FAILURE' for about a second, then 'WD RESET' thereafter, plus some beeping. The menu system works, but in an erratic way.? I tried changing the RTC battery, which was fine anyway, but this made no difference. I changed the EPROM for an old one I had (known to be ok) but this did not work either.? Everything is permanently set up, in an observatory, I checked supply voltage, which is fine . I then plugged in my spare unit, with the? same hand controller, motors and cables....this works fine. (so at least? I can continue observing) Any ideas what this fault is?....it looks 'serious'.....but if possible I'd like it? repaired! Many thanks Simon Kidd Herts UK
Paul Kanevsky All Messages By This Member #32896 Edited Hi Simon, This problem can be caused by some hardware failures. The one that seems to be fairly common is the failure of a voltage supervisor IC, as described in much more detail by Brendan Smith here: /g/Gemini_users/message/32034 Regards, ? -Paul toggle quoted message Show quoted text On Sat, Jan 1, 2022 at 06:11 PM, Simon Kidd wrote: Hi All, Happy New Year! Its not started well for me I'm afraid!? I have a quite old G1 (DIN motor connectors but with slide switch on/off) and it has worked perfectly for a very long time, with frequent use. However, tonight I fired it up and it immediately showed 'SRAM FAILURE' for about a second, then 'WD RESET' thereafter, plus some beeping. The menu system works, but in an erratic way.? I tried changing the RTC battery, which was fine anyway, but this made no difference. I changed the EPROM for an old one I had (known to be ok) but this did not work either.? Everything is permanently set up, in an observatory, I checked supply voltage, which is fine . I then plugged in my spare unit, with the? same hand controller, motors and cables....this works fine. (so at least? I can continue observing) Any ideas what this fault is?....it looks 'serious'.....but if possible I'd like it? repaired! Many thanks Simon Kidd Herts UK
Michael Herman All Messages By This Member #32897 Hi Simon, Your good news is that expert repairer David Partridge lives in Warwickshire UK.? Might be, so to speak, a next door neighbor.? He'll fix your faulty unit. He's at david.partridge@... Happy new year 2022... Michael toggle quoted message Show quoted text On Sat, Jan 1, 2022, 4:11 PM Simon Kidd <simonkidd01@...> wrote: Hi All, Happy New Year! Its not started well for me I'm afraid!? I have a quite old G1 (DIN motor connectors but with slide switch on/off) and it has worked perfectly for a very long time, with frequent use. However, tonight I fired it up and it immediately showed 'SRAM FAILURE' for about a second, then 'WD RESET' thereafter, plus some beeping. The menu system works, but in an erratic way.? I tried changing the RTC battery, which was fine anyway, but this made no difference. I changed the EPROM for an old one I had (known to be ok) but this did not work either.? Everything is permanently set up, in an observatory, I checked supply voltage, which is fine . I then plugged in my spare unit, with the? same hand controller, motors and cables....this works fine. (so at least? I can continue observing) Any ideas what this fault is?....it looks 'serious'.....but if possible I'd like it? repaired! Many thanks Simon Kidd Herts UK
David C. Partridge Member Profile All Messages By This Member #32900 开云体育 With luck and a following wind – I’ve got one with identical symptoms on the bench that is “resisting” repair! ? David ? toggle quoted message Show quoted text From: [email protected] <[email protected]> On Behalf Of Michael Herman Sent: 02 January 2022 00:18 To: [email protected] Subject: Re: [Gemini_users_io] 'SRAM failure +WD Reset' on Gemini 1 ? Hi Simon, ? Your good news is that expert repairer David Partridge lives in Warwickshire UK.? Might be, so to speak, a next door neighbor.? He'll fix your faulty unit. ? He's at david.partridge@... ? Happy new year 2022... Michael
Simon Kidd All Messages By This Member #32901 Hi Paul, Michael and David, Thanks for your useful replies...(I'll email you David in a separate message.). Hopefully this unit still has some life left in it! BTW...sorry for the strange font in the original message....not sure why that was, but the web page was behaving a bit oddly! All the best and Happy New Year, Simon toggle quoted message Show quoted text ------ Original Message ------ From: "David C. Partridge" <david.partridge@...> To: [email protected] Sent: 02-Jan-22 5:37:47 AM Subject: Re: [Gemini_users_io] 'SRAM failure +WD Reset' on Gemini 1 With luck and a following wind – I’ve got one with identical symptoms on the bench that is “resisting” repair! ? David ? From: [email protected] <[email protected]> On Behalf Of Michael Herman Sent: 02 January 2022 00:18 To: [email protected] Subject: Re: [Gemini_users_io] 'SRAM failure +WD Reset' on Gemini 1 ? Hi Simon, ? Your good news is that expert repairer David Partridge lives in Warwickshire UK.? Might be, so to speak, a next door neighbor.? He'll fix your faulty unit. ? He's at david.partridge@... ? Happy new year 2022... Michael

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