#YAESU FT 757GX PROBLEMS FULL#

This is probably a cap or two that has changed value. T3 is around 4mm further up than the other cores.Д¦) PLATE tuning control pattern not quite as it should be. I seem to have realigned around the problem, it remains to be seen if this is stable or will slowly drift off as whatever it is that is the root cause gets worse. Got everything back apart from 20m, it needed an extra 22pF cap on the back of the large trimmer. ThisВ got power back on 10m by adjusting T3 out a fair bit and then T2 out a little. So I marked the cores, removed the glue and tentatively adjusted. I really didn't want to but I had to know if the cans were adjusted right. I measured the input to the final valves and it was low on 12m and 10m so it had to be something in the driver/trimmer/preselector sections. I checked all over, checked the bandswitch, looked for mods, looked for burnt caps. The preselectors in the transmit path still had the original glue on. I can't sort this out, or align at 30Mhz until crystals are obtainedДҐ) Low power on 12m and 10m. However, the VCO unit has been readjusted for the changed bands 12m, 10A, 10B, 10C and 10D.

Please help! Luckily, the digital counter was the version that did not need hacking to display the 11m frequencies correctly. I need replacement crystals for 12m, 10C and 10D. Folded over the crystal legs and fitted them back into the sockets, then fixed them with a small dab of glue. I desoldered the CB crystals, luckily the sockets were still there, the wires were poked through the socket into the PCB.

It was modified for CB, so I only have 10A and 10B original crystals. This got back everything except 12m and 10mД¤) Replaced C70 200pF 1kV. Performed realignment as specified in the service manual.

#YAESU FT 757GX PROBLEMS FULL#

After this I could get a full 100W on 80m.ДЈ) Low power on bands 20m and above. It's a red lozenge type 1kV 1000pF, the ones that seem to like dying in these old Yaesus. Remove valves, unscrew and desolder two wires. This was due to a bad capacitor in the PA, its on the final valve PCB. Full power for a few seconds then fading to half power. If you have a junker with the keyer board in, I need it!Дў) Quite severe power fade under all modes. These are unobtanium, so I just unplugged the board and put fitting a replacement homebrew keyer on the list. This was a bad keyer chip a Curtis 8044 IC. The FT-902DM is A RIG!ДЎ) CW keydown all the time from power on. What were you thinking you ask, swapping a working radio and matching PSU with a dead boatanchor? Well, an FT757GX is a rig. I swapped it for a working Yaesu FT757GX and power supply. This radio has been waiting for some attention for a while, it's been tucked away for several years as I knew it had several problems with it.

Yaesu Ft 757Gx Problems