e7e6b6a6   
   XPost: sci.electronics.components, sci.electronics.design, sci.e   
   ectronics.equipment   
   XPost: sci.electronics.repair   
   From: ccon67@netscape.net   
      
   On Jan 30, 4:26 pm, DaveC  wrote:   
   > 80's vintage German printing equipment (offset press industry) uses a video   
   > plug-in card (made by the manufacturer of this equipment) to generate   
   > parameter display for the operator. The display is a standard baseband video   
   > tube monitor. (It is possible, being German and sold in the USA market, that   
   > the video may be NTSC or PAL.)   
   >   
   > There is no video signal on the BNC output connector.   
   >   
   > This is used equipment being resurrected, so operational history is unknown.   
   >   
   > There is a place on the video card labeled "Q2" that is the right shape &   
   > size for a crystal can. The pads look like it was ripped off the board: a   
   > short lead soldered in one pad; a hole in the other pad where a lead was   
   > soldered (poorly, apparently!). (Rough handling is a distinct possibility:   
   > the client is a used-equipment dealer and the fork lift is their main   
   > tool...).   
   >   
   > The board is populated with 80's technology, mainly 74LS' :: the crystal pads   
   > connect to an 'LS04 inverter/driver and then to an 'LS96 parallel-to-serial   
   > converter. The 'LS96 spec sheet says that it can be driver up to 25 MHz.   
   >   
   > The board uses a 8275 CRT controller, and in the datasheet it says: "CCLK is   
   > a multiple of the dot clock and an input to the 8275."   
   >   
   > Maybe these clues will tell someone what frequency this crystal needs to   
   > be...?   
   >   
   > What frequency crystal should I be looking for?   
   >   
   > Thanks.   
      
   Do you have pictures ?   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)