There is a diode in the schematic that should protect against accidental center-tip-positive mishaps
From: [email protected] To: [email protected] Date: Fri, 20 Mar 2015 14:52:31 -0400 Subject: Re: [M100] Screen dim and flickers randomly I’m not sure about any built-in polarity protection. I would assume not. The wallwart needs to be 6vdc output, center negative. For the ModelT I use this one from Tandy: Cat #26-3804, 8W, 6vdc, 400ma.Good luck, Bob From: M100 [mailto:[email protected]] On Behalf Of [email protected] Sent: Friday, March 20, 2015 11:26 AM To: Model 100 Discussion Subject: Re: [M100] Screen dim and flickers randomly Unfortunately I'd didn't come with the wallwart but im sure I can find one around the home. Have to remember to check center polarity with my multimeter since I've read it doesn't have polarity protection on the DC input. Is this true? Sebastian S. Cocioba CEO & Founder New York Botanics, LLC Plant Biotech R&D From: Bob Pigford Sent: 3/20/2015 9:59 AM To: 'Model 100 Discussion' Subject: Re: [M100] Screen dim and flickers randomlySebastian,Have you tried leaving it plugged into the wall wart (power supply) overnight? Might not help, but easy to try. Bob From: M100 [mailto:[email protected]] On Behalf Of [email protected] Sent: Friday, March 20, 2015 2:59 AM To: Model 100 Discussion Subject: [M100] Screen dim and flickers randomly Got a second M100 off eBay for a steal. With box, cables, manuals, etc. Its pristine. Turned it on with fresh batteries and screen is fairly dim with knob turned to max contrast and it flickers randomly, especially while typing. Contrast does work but lowest looks as if off and only at max is the screen readable but only at an angle. Any thoughts? Haven't opened it up yet... Thanks! Sebastian S. Cocioba CEO & Founder New York Botanics, LLC Plant Biotech R&D
