Hey guys and anyone still looking at this thread. First off, thanks for the service manual for nh600d. I am researching into doing a upgrade to my nh600d to a nh600 (basically just adding the line in and dc in. I opened up my nh600d for inital inspection and found the necessary socket holes for the parts are made on the mainboard. I have been looking thru the sevice manual for the nh600d and it seems that the chip has a mic in/line in on the chip just not inuse. I having trouble looking through the manual to see if in fact the necessary chip section is connected to the line in holes on the main hole, Would anyone know if it is? and also the dc in? and if holes for the line in and dc in are connected to the board and just require finding and soldering the appropriate parts (it would silly if it was that easy). Is there a value in the service mode of the nh600d to make the download button the rec button as it is in the nh600? Sorry if thats alot of questions and maybe even confusing. I have a thread made for this http://forums.minidisc.org/index.php?showtopic=10497. And for the ppl wondering why I would bother with it, if the ports are cheap and I can upgrade it easily then I don't need to buy another unit for recording and other ppl with a nh600d can get more use out of their cheap low end nh600d. Thanks everyone and anyone who helps me out. [attachmentid=351]