petonx Posted February 13, 2010 Report Share Posted February 13, 2010 (edited) I have a problem with my PIC burner. It detecting by P18pp, but Vdd & Vpp leds dnot changes, then I click Vdd/Vpp on/off buttons. Vpp(red) led is always ON. I use 74c14 instead 74hc14, is it my problem? they differ? see photo. Edited February 13, 2010 by petonx Quote Link to comment Share on other sites More sharing options...
Nasrudin Posted February 13, 2010 Report Share Posted February 13, 2010 mmh. no picture visible here Quote Link to comment Share on other sites More sharing options...
petonx Posted February 13, 2010 Author Report Share Posted February 13, 2010 Quote Link to comment Share on other sites More sharing options...
Janis1279 Posted February 13, 2010 Report Share Posted February 13, 2010 (edited) "Vdd Enable" and "Vpp Enable" signals on 74C14 inputs are changes when you clicking Vdd/Vpp on/off buttons? About 74c14 instead 74hc14 I don't know, but think is another cause! Edited February 13, 2010 by Janis1279 Quote Link to comment Share on other sites More sharing options...
petonx Posted February 13, 2010 Author Report Share Posted February 13, 2010 No, they dont changes. Vpp always enabled(then 74c14 are on their places). Quote Link to comment Share on other sites More sharing options...
Janis1279 Posted February 13, 2010 Report Share Posted February 13, 2010 May be you have another PC with LPT port,too. my Pic burner module don't working with my IBM Thinkpad computer, but it stable works with another - desktop PC. Quote Link to comment Share on other sites More sharing options...
petonx Posted February 13, 2010 Author Report Share Posted February 13, 2010 Solution found :D I replace 74c14 with our Russian 555TL2 :tongue: . It works excellent! Quote Link to comment Share on other sites More sharing options...
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