Hi Russell, yep, I have the new PCB version available at stuff.bradgrier.com
I've only tested it with the NEC PC-8201 & 8201a, as well as the m100 boards that I have, which are different from the one in your photo. If you don't mind, can you take a shot of VR1 including surrounding components etc? Also remove the ribbon cable. That'll help me figure out if it'll fit or if I need to tweak the design a bit. :) Thanks and stay warm! --Brad On Fri, Dec 31, 2021 at 12:03 PM Russell Pitman <[email protected]> wrote: > I am not sure that the voltages are coming through either as I need to > know the correct components to check, > > With a correct circuit diagram. I have continuity checked the switch SW3 > and that is good. 6v is seen at the battery terminals. > > > > I have noticed that Brad does a VR1 kit which might be worth sourcing, if > still available. > > > > Thanks > > > Russ > > > > > > Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for > Windows > > > > *From: *Jeffrey Birt <[email protected]> > *Sent: *31 December 2021 13:13 > *To: *[email protected] > *Subject: *Re: [M100] M100 Information > > > > >> I have been looking at the circuit diagrams and manuals for it but > none seem to match the motherboard > > that is inside this model. Cap and resistor numbers are different. > > > > That would be a very odd PCB. Kyocera even carried the same component > designations through to the Olivetti M-10. The M100 and T102 are different, > are you referencing the correct schematic? > > There are two versions of the M100 PCB but the changes are minor. There > are a few component differences in the reset circuit and the RS-232 output. > The later model also uses a standard EPROM pin-out for the ROM. > > Have you checked the power supply voltages? Always start with PCR: Power, > Clock, Reset. Checking these three things first will go a long way to > finding the problem. > > > > Jeff Birt > > > > *From:* M100 <[email protected]> *On Behalf Of *Russell > Pitman > *Sent:* Thursday, December 30, 2021 10:00 PM > *To:* [email protected] > *Subject:* [M100] M100 Information > > > > Hi all > > > > I have recently received my first M100 but unfortunately I am unable to > get any response from it. > > > > I have been looking at the circuit diagrams and manuals for it but none > seem to match the motherboard > > that is inside this model. Cap and resistor numbers are different. > > > > Finally I have noticed that the contrast potentiometer (VR1) is no longer > working and am wondering if this is > > why no display is seen? Does anyone know where I can source one of these? > > > > Many thanks > > > Russ > > > > Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for > Windows > > > > > -- -- Brad Grier
