Not yet. Ran out of steam for the night just as I got that stuff all set up and finally chooch'n.
I'll definitely check those, and check on a good unit too. On Jan 23, 2018 8:11 PM, "Mike Stein" <[email protected]> wrote: > Oops ;-) > > I'd meant to ask whether you'd checked the various voltages on the display > board (Vdd, V2, 3, 4, 5, 6, Vee). > > m > > ----- Original Message ----- > *From:* Brian White <[email protected]> > *To:* [email protected] > *Sent:* Tuesday, January 23, 2018 3:22 AM > *Subject:* Re: [M100] diagnose > > Well I don't know what I'm looking yet, but it's fun playing with the > analyzer. > > I rigged up a breakout for the lcd cable, passing all signals through > normally, and tapping some for the analyzer. > Started by tapping AD0-AD7 and PA0-PA7. Both these pics are the same > motherboard from the bad unit. One with a good lcd board, one with the bad > lcd board it came with. > > bad lcd > https://photos.app.goo.gl/4QDlMt1YbEd6pQbl1 > > good lcd > https://photos.app.goo.gl/fpF9cxmsRVeueMUy2 > > good times > https://photos.app.goo.gl/QLV1mZsNqsu4eXkA2 > > > On Sun, Jan 21, 2018 at 1:05 AM, Brian White <[email protected]> wrote: > >> I finally tried one of the most basic diagnostic steps I should have done >> almost first, since I have the parts to do so. I tried swapping the >> motherboard, lcd, & keyboard boards around with those from a good M100. >> >> The motherboard of the dead M100 turns out to be fine. Whatever the >> problem is, it's in the display board. (I eliminated the keyboard too) >> >> >> On Sat, Dec 30, 2017 at 10:33 AM, Fugu ME100 <[email protected]> wrote: >> >>> I would hold off desoldering the SRAM modules until it is established >>> where the problem is located. It could be one of the buffers driving those >>> chips. I believe someone already mentioned they had an issue with a buffer >>> and had to replace it on their broken machine. >>> >>> The CPU looks like it is doing the right things now it is a matter of >>> tracing out the Address, data and control lines to make sure they are >>> arriving at the ROM and SRAM correctly. >>> >>> Since the machine was on battery power when the backup power was turn >>> off the SRAMs would of been powered down while still being driven by the >>> attached buffers. So they would of been driven in a unpowered state which >>> could of damaged their protection diodes causing a short or overloaded and >>> damaged a buffer. >>> >>> I was not aware of the different models I must have really early >>> versions as they only have 1 SRAM module soldered in the other three are >>> socketed – which is nice for debugging. :) Thanks for that information I >>> keep learning more about my machines. :) >>> >>> From: M100 <[email protected]> on behalf of Mauro >>> Pintus <[email protected]> >>> Reply-To: <[email protected]> >>> Date: Saturday, December 30, 2017 at 6:35 AM >>> To: <[email protected]> >>> Subject: Re: [M100] diagnose >>> >>> Yes, my Olivetti M10 has 3 soldered modules for a total of 24k plus a >>> free socket for the optional one (see linked pictures below). >>> >>> I'm gathering courage to desolder all the SRAMs and place a socket on >>> the first position hoping that at least one module is fine. >>> >>> Mauro >>> >>> >>> >>> Inviato da iPhone >>> >>> Il giorno Dec 30, 2017, alle ore 12:25, Jan Vanden Bossche < >>> [email protected]> ha scritto: >>> >>> AFAIK, he's working on an Olivetti M-10... >>> Nut, also AFAIK, the M-10 followed the same scheme as the M100. >>> >>> Greetings from the TyRannoSaurus >>> Jan-80 >>> >>> >>> ------------------------------ >>> *From:* Mike Stein <[email protected]> >>> *To:* [email protected] >>> *Sent:* Saturday, 30 December 2017, 6:53 >>> *Subject:* Re: [M100] diagnose >>> >>> They were different models: >>> 26-3801 M100, 8K + 24K optional >>> 26-3802 M100, 24K + 8K optional >>> 26-3803 T102, 24K + 8K optional >>> >>> m >>> >>> ----- Original Message ----- >>> *From:* Brian White <[email protected]> >>> *To:* [email protected] >>> *Sent:* Saturday, December 30, 2017 12:44 AM >>> *Subject:* Re: [M100] diagnose >>> >>> >>> >>> On Dec 29, 2017 11:53 PM, "Fugu ME100" <[email protected]> wrote: >>> >>> In the T102 and M100 there are SRAM modules that are plugged into >>> sockets, I am not familiar with the M10, but these modules are easy to >>> remove from the socket and do not need to be desoldered. >>> >>> >>> >>> That's not necessarily true. If a particular unit was sold with 8k, then >>> it has 1 module soldered, and 3 sockets. If a particular unit was sold with >>> 24k, then it has 3 soldered modules and 1 socket. Same is true for both >>> m100 and t102. >>> >>> He most likely has to desolder 3 modules. I definitely do. >>> -- >>> bkw >>> >>> >>> >>> >> >> >> -- >> bkw >> > > > > -- > bkw > >
