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Question about the contrast of the HP-75C/D LCD
04-01-2021, 10:07 PM
Post: #1
Question about the contrast of the HP-75C/D LCD
Hi All,

Can one change the contrast of the LCD of an HP-75C/D? If yes, how?

Thanks!

Namir
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04-01-2021, 10:44 PM
Post: #2
RE: Question about the contrast of the HP-75C/D LCD
(04-01-2021 10:07 PM)Namir Wrote:  Can one change the contrast of the LCD of an HP-75C/D? If yes, how?
Hello Namir,
You have to open-up the 75 and manually adjust the LCD contrast with the potentiometer on the memory board.
Ref: PPC Computer Journal v2n5 Sept/Oct 83 Page 23, potentiometer VR at the top/right of figure 1.
Sylvain
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04-01-2021, 11:50 PM
Post: #3
RE: Question about the contrast of the HP-75C/D LCD
:-(

That says it all! Was counting on keystroke sequence.
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04-02-2021, 12:21 AM
Post: #4
RE: Question about the contrast of the HP-75C/D LCD
(04-01-2021 10:44 PM)Sylvain Cote Wrote:  
(04-01-2021 10:07 PM)Namir Wrote:  Can one change the contrast of the LCD of an HP-75C/D? If yes, how?
Hello Namir,
You have to open-up the 75 and manually adjust the LCD contrast with the potentiometer on the memory board.
Ref: PPC Computer Journal v2n5 Sept/Oct 83 Page 23, potentiometer VR at the top/right of figure 1.
Sylvain

At least they didn't do like the Sharp PC-1211 and put a pot in there, but glue it in place so you can't adjust it.
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