HP-41C service module question

[Jurgen Keller]

(10-22-2014 01:42 PM)Diego Diaz Wrote:  I also built a replica of said ET-11697 and perform the tests in the manual to confirm it shows the expected results. It does :-)

That's very interesting news, Diego! It would be great if you could publish the information how to rebuild it :-)

(10-22-2014 01:42 PM)Diego Diaz Wrote:  Regarding the first problem you mentioned: MEMORY LOST on power on with SM plugged. It seems to be related to I/O port connector problem (assumed SM is OK) or CPU board.

Any other hints? Does the HP-41 under test show other symptoms when in operation?

The MEMORY LOST also shows up without the service module plugged in, and the calculator does not respond to any key press. So I guess the diagnosis of the service module that D/S 3 IC is bad might be the correct guess. I have to cannibalize another HP-41 to test that, and have to postpone that a bit.