HP-35 display
#1

I have a version 2 HP-35 that is in nice condition. However, unlike other classic HP calculators that I have owned, the circuit traces and pins of the LED driver ICs are visible through the plastic LED display cover. This seems odd since I assume that normally some type of black plastic overlay would have been present to block the view of the LED driver pins and traces. Before I cobble a fix together, I am curious if anyone has information regarding whether other HP-35 calculators were produced with driver pins that were visible through the display? What are the dimensions or details of the material that normally blocks the view of the driver ICs?

#2

I've seen two high tech solutions employed by HP for this issue:

1) A strip of black fabric tape.
2) A small black extruded rubber profile that snapped between the LED's and the driver IC's.

#2 is prefered as the adhesive dries out on the tape and it falls off.



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