HP 33E Repair Advice

[PANAMATIK]

(03-26-2015 11:02 AM)kusmi Wrote:  [*]Whenever a digit is shown, the top-most and top-right segment is always "ON", so all 1s appear as 7s, etc (see attached images, the first shows the display when I enter 1111111111, the second shows the number -1234567890). Those additional two segments are only ON when the actual digit is displayed - if the digit is OFF, all segments are OFF.

A very common defect of a 30s calculator is one or two missing segments in all digits, because the contact of this segment is lost. This is very easy corrected by what you have done, twisting and reestablish the contact somehow.

But it is more unusual, that segments are lit always. The reason could be a short between some segments, but unfortunately it points more to a defective display driver. But I hope I am wrong because I don't want to disappoint you.

IMO the 30s are very resistant to real damage. I repaired some of the 30s just by opening the case, do some cleaning and putting it together again. You should try it. The only difficult part is to open the case, which needs some real force.

http://www.hpmuseum.org/cgi-sys/cgiwrap/...ead=151125

Bernhard