Hi everyone, I built the ICD and ran into some problems: When I try to program the target PIC, sometimes it programs OK and sometimes it says "Check for target: Not exist". Then when I click on the Option->Self Test, it says "Debug Module: Not exist, Incorrect MCLR pin low voltage. Check ICD pi0x7020". The VDD voltage = 4.75V, VPP = 13.71V. The strange thing is sometimes even when I get the same error message in the "Self-test" above, it still detected the target when I press "Program" and programs the target fine. Do you know what my problem is? I have a 47k pull up resistor at the target. I tried to change to 10K but it doesn't seem to make any difference. Please help! Thank you in advance! Thomas --------------------------------- Do you Yahoo!? The New Yahoo! Search - Faster. Easier. Bingo. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.