DRIVER UNIT broken Posted by: "dg2ja" austjaja@arcor.de dg2ja Date: Thu Sep 7, 2006 1:51 am (PDT) Hi, The MOSFET (PD55015) on the driver unit of my IC-7000 is broken (smoke!). I have just called Icom-Europe and the technician told me, that the problem is well known and there is a modification for the Driver Unit from Icom available, but he did not told me what it is exactly. Does anyone knows something about this modification, so that the changed transistor will live a little bit longer? Juergen Aust - DG2JA - ========================================================================= DRIVER UNIT broken Posted by: "Lnk3d Lnk3d" lnk3d@yahoo.com lnk3d Date: Thu Sep 7, 2006 6:21 am (PDT) Only modification to the driver unit I am aware of is the 8khz tone fix, it involved moving some components around from the top of the driver unit to the bottom, i dont recall all the details but i belive files are available on the 8k tone fix available in the files section of this group. If there is another modification to the driver unit, i am unaware of it, but would be most intrested in finding out what it may be. ========================================================================= DRIVER UNIT broken Posted by: "SM5DIC" sm5dic@ragge.se sk5cr Date: Thu Sep 7, 2006 7:45 am (PDT) Hi Juergen, This is the Mosfet (Driver Amp.) in the Driver Board, Driver Unit, and I remember someone on this reflector say his Driver Amplifier to burned. It wasn't fitted with the white thermal grease and gave up because of overheating. Maybe the Mod-Kit is a tube of this thermal grease. Maybe ICOM forgot to apply any... 73 de Gus SM5DIC ========================================================================= DRIVER UNIT broken Posted by: "dg2ja" austjaja@arcor.de dg2ja Date: Thu Sep 7, 2006 1:27 pm (PDT) Dear Gus, thank you for your answer. I think too that it was a thermal problem which damaged the driver stage. Adam (ab4oj) writes on his Icom- Page: "In addition, Q504 (PD55015) will dissipate approx. 15W without drive". I will try to change the Mosfet and we will see how long it will stand. Nevertheless I am very interested in the Icom- Mod if it is really more than a tube of thermal grease. If anyone has some information, please let me know. 73 de DG2JA Juergen Aust ========================================================================= ========================================================================= ========================================================================= ========================================================================= ========================================================================= ========================================================================= ========================================================================= ========================================================================= ========================================================================= ========================================================================= ========================================================================= ========================================================================= 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