krazydoc33
Member
Back in mid June my trim failed due to a blown trim fuse that feeds the AV 50,000. After much trouble shooting of the trim servo and leads I came to the conclusion that the chip on the AV board had shorted out as a new fuse would blow immediately. If I disconnected the wire to pin #9 and put in a new fuse, all was OK. The AV went back to Van's for repair but it got there a week or so before Oshkosh. The repair person stayed behind at Oshkosh to help clean up then went on vacation! I got the board back in September and it was OK for about a total of 30 minutes, two short flights plus some ground testing then the fuse was blown again. After some back and forth with Van's they sent me a new AV 50,000 which has lasted for about 3 hours before the fuse blew again today. A larger fuse (5 amps) blew when inserted. Inserting a fuse only puts power to the chip on the AV 50,000 board. From the schematic it looks like that there is nothing else on that quadrant of the chip, without the trim switch being either up or down nothing should be happening, yet it blows fuses. Anyone have any ideas where to look for this short or how to further troubleshoot the problem? I am getting very frustrated.
The RV-12 is completely standard, was signed off in 2013 and has about 100 hours on the tach. Never had any electrical problems before this came up.
Henry
The RV-12 is completely standard, was signed off in 2013 and has about 100 hours on the tach. Never had any electrical problems before this came up.
Henry