Hi In addition to Igor I would like to share my personal experience about ICD. (I am using a green 3mm led by the way what is the original one's color?) check the jumper on the header and on the board. If you have the one that is distributed through internet you have a modified version. Original ICD takes power from the target application board. That is the header pins 11-12 31-32 gived VDD-GND to ICD circuitry. The Modified version has an extra power supply on it that can be switched on via the jumper right behind the female 9 pin RS-232 connector. The Designer added this modification to use ICD as a standalone programmer. Programming voltage is created by a Stet-Up / Boost type Switch mode power supply. Generally when you use it from external power source you can encounter problems. The main reason that causes MPLAB to think that there does not exist any PIC in the socket is VDD. The modified version gives 5V on the 6 pin header. I have measured it, but after connecting the header to 6 pin connector I have measured about 3V on the headers VDD pin. So there is a kind of loading effect (a resistive divider or next stage draws high amount of current from ICD that causes a great voltage drop I guess). Well I could not figure out what was causing this anyway but that is what I have experienced about ICD. I hope it can give you an idea. And if you find a solution please inform me about this. I advise you to use the VDD from the connector. Put a two pin female connector to pins 11-12 as VDD-GND and use it that way. Take it easy ihsan ----- Original Message ----- From: "Thomas N" To: Sent: Sunday, May 25, 2003 8:42 PM Subject: [PIC]: Microchip ICD1 > Hi everyone, > > Do you have the ICD (for 16F87X) from Microchip or a working ICD? Would you please tell me what the voltage readings at VDD and VPP are? (Click the "Options" button on the ICD dialog. The voltage display is at the lower left corner) > > I built the ICD myself but sometimes it can program the target PIC, sometimes it says "No target". I am troubleshooting it right now and I think it has something to do with the programming voltages. My VDD reading = 4.68V, VPP = 13.80V. > > Thank you very much for your help! > > Thomas > > > --------------------------------- > Do you Yahoo!? > The New Yahoo! Search - Faster. Easier. Bingo. > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > email listserv@mitvma.mit.edu with SET PICList DIGEST in the body -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body