Yes, the potentiometer is the first thing to check. I had one fail on my M100. However, on my NEC, the pot is OK, but the contrast still doesn't work, so I'm interested in finding out if yours has the same failure as mine.
On Fri, Mar 22, 2024 at 12:57 AM Alastair Wiggins <[email protected]> wrote: > Hi, > > I have an NEC PC-8201A which was working perfectly, up to the point of > swapping the 4 AA batteries. Popped the new batteries in and the screen > contrast is very low, making it difficult to read unless the screen is > viewed at a specific angle. The screen contrast control appears to have > stopped functioning. > > Photo of unit powered off: > > https://photos.app.goo.gl/Cf9AnqTWBrQ4RQzZ9 > > Photo of unit on at the same angle: > > https://photos.app.goo.gl/8UMusvqhNRs8vnEE6 > > After angle adjusted: > > https://photos.app.goo.gl/Nzg71eZxN3oZ2Vqw5 > > As you can see, I have a REX# installed. > > I opened it up to take a look, but there are no leaking capacitors or any > signs of corrosion. I assume the variable resistor is the first thing to > check? > > Thanks, > > Alastair Wiggins > Sydney > Australia > > >
