JDM PIC programmer

Hello, A while ago I came across a schematic for a slightly modified JDM PIC programmer which I just finished building. Unfortunately using it with IC Prog did not yield good results- even though Vdd and MCLR voltages are present, I am only getting blank data when trying to read/write a

16F84A chip.

  • What other signals should I be checking and what are the expected values ?

  • What are reliable settings in IC Prog ?

  • Does the schematic look correct? I compared it with the original design and noticed a 2.2k instead of 1.5k resistor and the transistors are different, though they seem to have similar specs :
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Thank you!

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