speed
06-03-2004, 09:29 PM
Had 2 2800's that would not Jtag (Spent hours & Days trying). I had purchased a universal Jtag with Pogo pins from another site, non-buffered. Getting frustrated I cut the POGO connector off and soldered cirectly to IRD. Still nothing and I tried all versions of Jtag SW. I ohm'd out the connections a million times and everything had connectivity even to the top of the Board.
So, what I did was zero'd the meter out (AFter replacing batteries, it would not go to 0 only to about 800 ohms) and started looking for the 1K ohm resister reading. (THe DB25 connector had the small resisters built into the PCB attached to the connector.) What I found was 0 (Zero) ohms accross the connections, they were like all shorted out, probably during the solder flow process. So I removed them all and added my own 1K ohm resisters. (Looks like a spider now. :)
Great News, I got the Box keys and saved my Tsop from the one 2800. Life is good, and patience pays in the testing world. :D
SO, if you are having a hard time getting box keys from a new universal Jtag, always check to see if you have a 1K ohm reading across the five pins. (2-2, 3-3, 4-4, 5-13, 6-5) and a good ground.
So, what I did was zero'd the meter out (AFter replacing batteries, it would not go to 0 only to about 800 ohms) and started looking for the 1K ohm resister reading. (THe DB25 connector had the small resisters built into the PCB attached to the connector.) What I found was 0 (Zero) ohms accross the connections, they were like all shorted out, probably during the solder flow process. So I removed them all and added my own 1K ohm resisters. (Looks like a spider now. :)
Great News, I got the Box keys and saved my Tsop from the one 2800. Life is good, and patience pays in the testing world. :D
SO, if you are having a hard time getting box keys from a new universal Jtag, always check to see if you have a 1K ohm reading across the five pins. (2-2, 3-3, 4-4, 5-13, 6-5) and a good ground.