As Y1 is located close to the RTC, I would assume it to be a 32.768 kHz crystal the main oscillator is the square box in the middle of the board.
On Saturday, December 22, 2018 at 6:12:55 PM UTC+1, Mat Stalkman wrote: > > Would you provide the model number please? > > It's only because 'Classic Mac' and 'Compact Mac" tend to be > interchangeable and essentially refer to the rectangular box, 9" black and > white screen, all in one computer. > > There were 11 models of 'Classic Macs' with minor sub models. It would > help to narrow down the details of the part you require. Generally, the > crystal oscillators run at twice the frequency of the CPU. For example, a > 8MHz CPU has a crystal oscillator running at ~16MHz. There will be a > tolerance for the accuracy of the oscillator. Similarly for the CPU. It may > be labelled as an 8MHz CPU but may run at 7.98MHz. > > As far as I can see, in most images, Y1 refers to a crystal oscillator > marked "F1JAPAN" but with no other markings as to its value. > > (vCOM) Verified on a board at Cult of Mac - location B1. Y1 unverified but > it's an 8MHz CPU, Y1 is 15.6672MHz. > (vDB) Verified on a schematic at Digibarn.com - Locations D4 & D1 > (vWM) Verified on a board at Wikimedia - Locations B10 & E10 > (vCCA) Verified at CCAdams.org - Locations B10 & E10 > (vi2WP) Verified at i2.WP.com - > (vFF) Verified at FairfieldElectronics.ca > (vCM) Verified at ClassicMacs.com > (vINANIS) Verified at inanis.net - Y1 Upper Left corner. > > The original Macintosh or '128k' - CPU 8MHz - Suspect Y1 = 15.6672MHz, U20 > = 15.6672MHz. (vCOM) > > Macintosh 512k - 8MHz - Suspect Y1 = 15.6672MHz, Y2 = 15.667200MHz. (vDB) > Macintosh 512ke - 8MHz - Suspect Y1 = 15.6672MHz, Y2 = 15.667200MHz. (vDB) > > Macintosh Plus - 8MHz - Suspect Y1 = 15.6672MHz, X = 15.667200MHz. (vWM) > > Macintosh SE - 8MHz - SuspectY 1 = 15.6672MHz, X = 15.667200MHz. (vCCA) > Macintosh SE FDHD - 8MHz - Suspect Y1 = 15.6672MHz, X = 15.667200MHz. > (vCCA) > > Macintosh SE/30 - 16MHz - Suspect Y1 = 31.3344MHz, Y2 = 31.3344MHz, Y3 = > 147-39(?). (vi2WP) > > Macintosh Classic - 8MHz - Suspect Y1 = 15.6672MHz, G1 = 15.6672MHz. (vFF) > > Macintosh Classic II - 16MHz - Suspect Y1 = 31.3344MHz, G1 = 31.3344MHz. > (vCM) > > Macintosh Color Classic - 16MHz - Y1 = S3256E, G1 = 31.3344MHz. (vINANIS) > Suspect Y1 is 31.3344MHz. > > Macintosh Color Classic II - sold mainly in Japan. - 33MHz. No data for > oscillator frequency. > > Hope this helps you and others, > > Keith > > On Friday, 21 December 2018, 16:20:03 GMT, Christian Wacker < > [email protected] <javascript:>> wrote: > > > My Classic Mac went to a checkerboard after I dusted the system. Time for > replacement capicitors and a good clean. > On my board, my Y1 oscillator is very corroded and damaged. I'm struggling > to find it's specs (Can't read it) to get a replacement to attach while I'm > doing the caps. > Anyone have tips for where to start? > > -- > -- > ----- > You received this message because you are a member of the Vintage Macs > group. > The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our > netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml > To post to this group, send email to [email protected] > <javascript:> > To leave this group, send email to [email protected] > <javascript:> > For more options, visit this group at > http://groups.google.com/group/vintage-macs > > Support for older Macs: http://lowendmac.com/services/ > --- > You received this message because you are subscribed to the Google Groups > "Vintage Macs" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] <javascript:>. > For more options, visit https://groups.google.com/d/optout. > -- -- ----- You received this message because you are a member of the Vintage Macs group. The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To leave this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/vintage-macs Support for older Macs: http://lowendmac.com/services/ --- You received this message because you are subscribed to the Google Groups "Vintage Macs" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
