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Model 805
Sept 19, 2022 16:23:24 GMT -5
via mobile
Post by ivanhoe on Sept 19, 2022 16:23:24 GMT -5
Problem
The controller reads Err 02 when turning on.
Replacement of Dallas DS1225Y by new DS1225Y -150+ does not help. However, puting DS1225Y from another 805 working controller makes the first one working.
Question
Is there any memory initialisation procedure in 805 controller (like for 330 model, pressing and holding "Escape" and "Units" btn)?
Thanks
I.
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Post by Lake Shore Ryan on Sept 22, 2022 16:59:29 GMT -5
Hi, well I must say that I applaud your determination to keep this 805 controller running. I found a copy of the manual that looks to have been published in 1988  and I see the mention of initializing the NOVRAM. I don't have any experience with this unit, since I think I may have still been learning to ride a bike when these were made, but I will check if we have any documentation that might help. Do you have any way to determine whether the new DS1225Y you sourced is good? |
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Post by Lake Shore Ryan on Sept 23, 2022 12:57:44 GMT -5
I couldn't tell if our engineer was annoyed or impressed to be talking to me about the 805 temperature controller , but he found some information that might be helpful. It seems that there is a switch inside the instrument that is used to initialize the NOVRAM. If the NOVRAM is corrupt, the firmware stops and waits for switch 4 to be switched. Then it will initialize the NOVRAM and then stop until switch 4 is open again. This is his best guess from looking at the old code and schematics. Could you let us know if this works? He and I are now both very curious if you can get your instrument working again.  |
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Model 805
Sept 26, 2022 10:16:16 GMT -5
via mobile
Post by ivanhoe on Sept 26, 2022 10:16:16 GMT -5
Hello Ryan,
Thank you for you prompt response!
Actually, we copyied the information from the old WORKING DS1225Y to the new DS1225Y-150+ using a programmer. So now it works.
Any way, it is good to know about the option you have sent.
Best
I.
PS John Harrison clock is still working:)
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Post by Lake Shore Ryan on Sept 26, 2022 11:04:49 GMT -5
That's great to hear! I didn't realize you had a programmer, but this was going to be our next suggestion if initialization didn't work. Haha, I have to admit I didn't know about the John Harrison clock, and now I do. Sounds like excellent company for the 805 to be in . |
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Post by ivanhoe on Sept 26, 2022 16:37:32 GMT -5
I knew you would like it. It was nice to communicate with you. Thank you for your help. Good luck! I. |
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and I see the mention of initializing the NOVRAM. I don't have any experience with this unit, since I think I may have still been learning to ride a bike when these were made, but I will check if we have any documentation that might help.