Pic-Burner: switching Clock fails

Testing/Troubleshooting
1

Hi,

i’ve built a Pic-Burner. All tests except SCLK on/off are passed fine. But when switching SCLK on or off nothing happens - always 5v on RB6. For testing i’ve exchanged the 74hc14, same results.

Any ideas whats going wrong?

Mike

2

I don’t have any specific information about the PIC Burner module, but looking at the schematic I would want to know if pin 1 and 6 of the 74hc14 shows a clock signal. 

3

Hi,

thanks, I think you mean pin 1 and 4 as 6 is for Data Out. I’ve measured pin 1 and 4, giving me 5v independed of the SCLK switch.

Mike

4

The end of my topic (burner question) is about the same problem, only that it goes for all options in P18.

Havent found an answer yet - it was just to let you know (not that you can use it  :slight_smile:

Carsten

5

Did you also measure the voltages directly at the LPT port?

Best Regards, Thorsten.

6

Oh man, why didn’t I came to this idea by myself. Doh!

But the results, hmm. 1,62 volts independend of the SCLK switch. Don’t know what this means. Bad Parallel-Port?

(measured with plugged-in burner, without power-supply. had let recognise the burner by p18 and turned the power of after that)

I’m using the recommended cable from Reichelt.

Mike

7

Hi,

I’ve found the error! It was the Parallel-Port, really disturbing that only the SCLK-Signal doesn’t work. But ok, with another PC it works as desired.

Thanks to you all for your help!

Mike