Interesting... What are the serial numbers of the two machines? Most of the 'old' M100s use a board labelled PLX110CH1X; is yours a model meant for a market other than North America by any chance?
Similarly, most of the T102s use a board labelled PLX144FH1X so again, I wonder where yours came from and/or how old it is. But in any case there shouldn't be an issue around M18. In both the m100 and the 102 C17 and C18 are padding caps for the crystal and go between pins 12 & 13 to ground respectively, and C19 is merely a bypass cap from Vb to ground; I can't see any reason why that would change. There are minor differences among the different M100s and the 102, mostly related to RAM and ROM chip and connector pinouts, but nothing around M18 that I can see (or imagine). See Fig. 4-16 of the M100 Service Manual or Fig. 2-12 of the 102 Tech reference. m ----- Original Message ----- From: "John Watson" <[email protected]> To: "Model 100 Discussion" <[email protected]> Sent: Wednesday, May 25, 2016 12:19 PM Subject: [M100] Schematic needed >I have a model 100 and a 102. The 102 has PCB number PLX196CH1X and the > 100 is PLX120BH1X. > > I can't find any information on these boards at all. The Service Manual > for the 100 and the Technical Reference Manual for the 102 show entirely > different component numbers etc. I assume there are different versions > of each computer (early/late or N American/European). > > My 102 has suffered from some significant and mysterious corrosion > beneath M18 D1990AC. I have managed to remove the IC along with some > surface mount capacitors C17, C18 and C19. However the PCB tracks are > damaged and I need to check continuity. This is where I need the schematic. > > Does anyone have any good quality schematics of these boards or any > information at all? > > Many thanks. >
