HP 41C DOES NOT BEEP

[aurelio]

(08-30-2014 04:46 PM)Mark Hardman Wrote:  

(08-30-2014 04:13 PM)Geoff Quickfall Wrote:  Pictures of the serial number and more pics of the board with the black cover removed would be interesting.

Could you also please verify that the halfnut is actually a 41C and only has 63 registers?

Hi Geoff, hi Mark, the halfnut is really a 41c (63 registers) and I've checked for the serial it was made in the 82 year , 35th week, in Singapore (2235S4XXXX).
Geoff, I could send you pics in the original size (not formatted for the forum) but I think you need to see the rear of the board and I'm a little scared in removing it
Somebody knows the IC in place of the half-board?
I think maybe the "beep" missing could be due to a cold soldering, I added a magnified pic of the board and it seems the upper point could be one of those.

Actually I'm half-happy of the "sickness" of this beauty, otherwise never I was going to open it and find what we see