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+--- Thread: Faulty Register RS5 in HP-97 (/thread-15618.html)
Faulty Register RS5 in HP-97 - Karl-Ludwig Butte - 09-22-2020 02:30 PM
Dear All,
I just executed the "Diagnostic Program" from the standard pac on my HP-97 and it showed error code 15, meaning that RS5 is defect. I further investigated and found out, that storing a value in Reg 5, f P<->S, f P<->S, RCL 5 shows either 0 or sometimes -0,66 but never 5 which was stored in the first place.
Does this mean that explicitely RS5 is defect or is another reason possible? Have any of you ever had a similar case and could it be repaired?
Any hint will be very much appreciated.
Thank you very much in advance.
Best regards
Karl
RE: Faulty Register RS5 in HP-97 - teenix - 09-23-2020 08:53 AM
It would appear that the part of the RAM chip (Probably in ROM 6) that stores/recalls RS5 is faulty.
You could also verify this by
Code:
15 [h] [ST I]
5 [STO] [i]
[RCL] [i]The display should show 5.
cheers
Tony
RE: Faulty Register RS5 in HP-97 - Karl-Ludwig Butte - 09-23-2020 09:43 AM
Hello Tony,
thank you very much for your reply. I entered the code sequence you described and got 5 as result just as you described.
I then repeated my original Test 5 STO 5, f P<->S, f P<->S, RCL 5 and received the correct result 5, too. It seems that the malfunction disappeared.
The I retested the diagnostic program from the standard pack again which passed without errors, too.
Everything works fine again. I don't know how and why but I'm not complaining ;-)
Thanks again.
Best regards
Karl