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JDM PIC programmer troubleshooting

Discussion in 'Electronic Basics' started by [email protected], May 13, 2007.

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  1. Guest

    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 :
    http://img218.imageshack.us/img218/633/jdmro1.png

    Thank you!
     
  2. none

    none Guest

    What are the value of those voltages?
    Another item on a 16f84a. IIRC its Vpp has to have a voltage of 13V
    nominal.
    Start with Vpp and Vdd values. If Vpp isn't at least 12V it isn't going
    to program.
    Probably not critical. The biggest problem with the JDM programmer is
    that it requires a real serial port (i.e. +/- 12V signals) to work
    properly. Most modern serial ports swing at much lower voltages.

    BAJ
     
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