|HP 17BII malfunction: cannot select RPN mode|
Message #1 Posted by Rafael del Río on 1 Mar 2006, 3:07 p.m.
My HP17BII has a malfunction when trying to select RPN mode.
When selecting "Modes" it hangs and show a strange display.
During My life I‘ve had an HP 25 for the High school, a 67 for my Chemistry University studies, a 41C used during my military service, a borrowed 38 for studying an MBA, and finally the 17BII.
I bought the 17BII on 1991 BECAUSE it had the RPN mode.
some years ago, a friend gave me his HP12C because he did not used it.
I left the 17BII at home and used it in few occasions.
Unfortunately I lost the 12C at the airport some time ago
I took the 17BII and the batteries were off. I replaced the batteries and when trying to select the RPN by pushing <Shift>, <MODES> it locked.
I remember that the 41C, could be set in "synthetic programming" mode. What my 17B shows in the display looks very similar.
After reading everything related to 17BII in the forum I learnt very much.
I knew that my calc was an “international” model, with 2 ROMs and an extended <MODES> menu
I also learnt how to perform the self test. The result was the following:
ROM, DRAM, URAM and KBD were OK. Final message was:
| OK-17B II – I |, (so version I for the main ROM)
Then, after pushing a key:
| MACHINE RESET |
The forum also show me how to get the version of the ROMs, <CLR>& <4th Menu Key>, then <BACKSPACE>, giving the following display
| 021E8:71FC70E81FC73055 |
So there is information there about the 2nd ROM
After that, I tried to select RPN, but no result: same hang-up when pushing <Shift>, <MODES>
· Also no result when forcing the machine reset via <CLR> & <3rd Menu Key>
· Also no result when forcing a “MEMORY LOST” via <CLR> & <1st Menu Key> & <6th Menu Key>
· Also no result when short-circuit the batteries (without and with batteries, on ON and on OFF)
Now I think that the 2nd ROM – the “international” has some problem, despite the test doesn’t show any
I just want to have my old friend RPN mode
Any idea to restore it?
Thank you all