[Yaesu] FT-902DM RECT A Board getting hot

[steve sutfin]

Hi Dan,
Same symptoms here on my FT-901DM. It seems that the bleeders on top of PB-1717 ( Rect C ) plus the choke and components on PB-1708 ( Rect A ) create most of the heat in these rigs. Yaesu suggests that R13 ( 47K, 1/2W ) and R03 ( 470 Ohms, 1W ) on PB-1708 be changed to the same values in 2w versions. I havd also read that some remove the black plastic 'board cover'. I just neatly drilled a few large holes in my cover above Rect A & C......seems to help.
GL,
Steve k7dna

Dan Trigilio wrote:

> Hello group, Anyone here that has a FT-902DM ever notice that the RECT A Board is getting hot? I have had my 902 for a couple of years and love it. Anyway, I noticed the other day that the choke on the RECT A bd seemed to be running kind of hot which inturn warms up the filter caps above it. , I swapped the bd with a spare, the other bd seemed hot to me too. They seem to get pretty warm after an hour or so on receive........ I pullled all the boards out the card rack and pulugged back in one at a time. Didn't see any change. The radio is working fine and the 12 and 8 volt regulators seem to be OK. No smoke yet, but I am wondering if anyone else has seen this. Any thoughts? Thanks.
>
> 73, Dan W6DAN.
>
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