If the heatsink is getting warm in RX that is a sign that you may have a leaky or shorted final or driver. The bias regulator circuit should also be checked.
Did you mean that you did not have the DR7 board installed? You will have no frequency control unless you have a Jumper Board connected in its place but it would not cause PA overheating of fuse blowage.
On Thu, 10 Apr 2025 08:55:06 -0700
"Bill NZ0T via groups.io" <nz0tham@...> wrote:
Update and it ain't good.? I got the LPF put back in yesterday - soldering the wires back on was not as bad as I thought would be thankfully.? This morning I got the bandswitch rod back in and the bandswitching seems to be fine.? I re-installed all the boards with the exception of the digital, crossed my fingers and fired the TR& up.? Got lights for a second and then the PS7 blew.? After a short reset I tried again same result - dumb I know.? Finally I found that the rig would stay on on 10 meters only. There is audio, PBT works but I don't hear the calibrator or any other signals.? That's when I noticed the TX module heatsink was hot even though I see no RF output. So I quickly shut the rig off.
So I'm gonna step back until next week before I cause further damage to the rig.? My initial thoughts are that I wired the LPF incorrectly somehow but I was really careful making sure I documented by photo where they went and made sure I soldered them back in the correct? spots.? I checked again and they all look correct.? Maybe the LPF module has an issue and the weird mods were an attempt to repair it?? Maybe I didn't get one of the boards re-inserted correctly? Aaarghhh!
--
73
-Jim
NU0C
Jim Shorney