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After contacting Igorsk I just checked the service manual. Actually, there is a variable resistor that seems to set the "black"-level of the display. Unfortunately it looks as if one has to disassemble the whole unit before you can get to the VR.
So at this point I don't know if it makes sense to adjust the VR without immediately seeing the effects of the new settings.
Did anyone take apart his unit? I'm wondering if the readers innerts can just be moved out and the VR be adjusted without detaching the screen and the card reader slots.
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