> N2MG concluded:
> >However at least three of you suggested the "backlight" supply. Being
> >adventurous, I started disassembling the radio (without the service
> >which is on order - c'mon, I just bought this radio!) and lo and behold,
> >Yaesu put the inverter circuit right where it belongs - on the
> >of the "EMI firewall" behind the front panel so it was easy to find. One
> >the emails I received suggested I look at the thermal fuse and sure
> >TF1 was open as suspected. Bravo!
> My turn to suggest searching eHam.net, where you would find that I posted
> some time back that TF1 could be the culprit. ;^)
> Finally figured that one out after the third failure. Credit for that
> JA1RJU. Yaesu itself seemingly knew nothing about it. Bounced the idea
> off K7JA & didn't get a thumbs down but didn't exactly get a thumbs up,
> either. I sense the official position will be that power supply for
> tube is considered a part & therefore is to be replaced outright - typical
> an out-sourced module like this.
Yep, Yaseu tech dep't told me they never heard of any problem with the
inverters (TF1 or the whole board) - that what I heard was some kind of
Internet hoax. "Well, gee," I said, " it's funny, then that the hoax helped
me identify the exact part (TF1) *immediately*." He had no response.
The inverter board does appear to be outsourced - typical in the US for
backlight inverters. We always outsource them at work - but I was somehow of
the mind that the Japanese was less prone to this kind of
I've read a lot about the slow starting display/backlight problem...not sure
that it could be the TF as well, but maybe? Anyone try that?
73 Mike N2MG