----- Original Message ----- From: "Nick Pugh" quadpugh@bellsouth.net To: amsat-bb@amsat.org Sent: Thursday, October 16, 2008 1:57 PM Subject: [amsat-bb] g 5500 rotator

Hi AMSATERS

My Yaesu G 5500 Rotators us blowing fuses. The primary of the transformer has <.5 ohms of resistance implying a shorted primary. I tried to order a L3190011 transferor from Yaesu they told me that part is no longer available. Do you believe my diagnosis is correct and where do I get a replacement transformer?

Thanks

nick

Hi Nick,

Unsolder both primary wires from the 2A fuse holder and from the SW1 power switch and measure again the primary resistance and see if it is still < .5 ohm

If the resistance is < .5 ohm and the primary winding has been completely carbonized by the heat then your transformer should have smoket for a long time before to go in short circuit and you should have been alerted smelling the smoke.

If the transformer is not showing the classic smell of a smoked winding it is possible that the short appens accidentally somewere between the first and second wire feeding the primary winding so that the short can be found and removed.

In addition measure if the primary winding is insulated or not from the iron core i.e. from the ground and from both the low voltage secondary windings.

In any case if the transformer is not longer available from Yaesu it is not a problem to rewind it completely.

73" de

i8CVS Domenico