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tx/rx light works when the radio is keyed it never stopped working, the pre-driver for the driver final is also getting hot. Voltage on its center pin is very high. I'll check the work I did again, i replaced the 2sb754 with the 2sb827 when I first did the di it was the only ones i have around...

So mic amp and ALC-AMC not the problem so far. Message when you get time Andy, I'll be around.

I removed tr32 and tr34 and carrier is still the same. Weird part is that tr32's location is marked on the board as tr37, there are 2 tr37's silk screened on this board lol. P.S. my injection points audio cable is plugged into my phones headphone port. it leaves no hifi equipment failures to...

The new cap at C174 was bad, it was new? I replaced it wattage is back. Ok back to checking the mic amps feedback resistor. I'll be back

I placed the 560pf across R165 and lifted R172 but now the carrier will only got from 0 to .2 watts. Even with the cap removed wattage dropped out to nothing but driver carrier I believe.

You the man handy Andy, I'll try that and get back with you. Thanks again!! KD8QPV

I have C174 swapped with a new one.

I've changed c143, c146, c147, c148, c149, c150, c189, c190, c191, c212, tr49, tr50, tr51, D29 and D91 still no change same as befor. I also changed vr13 and vr16

Tr50 and tr51 show 3v on the collector (center pin) when going from board ground to pin, 2.85v when keyed. There should be 5.40 volts dc on the collector.

Might try to change vr13 also, it shows v13 to also be for adjustment of the rf power.

I checked tr41, 50, 51, all voltages show good on amps and regulators when keyed with audio cord in, but they're still getting hot and wattage still won't turn down if turned up, key set to 2 watts and all the way up 5. Once turned up it won't go back down. I changed D91 to a new 1n4148 and put...

This 55v has a 1k ohm pot for vr16, should I change it out for a 5k ohm pot at vr16 or leave it 1k ohm? Someone might have even changed it before because my other radios with the same board show 5k ohm ports at vr16. Maybe where they were dual final boards is the difference?

Thanks andy, I have a 330uf in c190 I'll switch it back to the 100uf and check all the points you spoke of. I just needed a spot to start also the caps I have changed so far (electrolytic) I've found a few leaking. I like throwing new parts into radios but I'd rather find the problem then change...

C191 is where I inject audio, the hole closest to the center of the radio is the positive of the 10uf cap the negative side of the cap goes to audio (center pin) (tip) on the audio cord from the laptop. I was wondering if it could be a component behind the inject point but didn't ask cause I...

Other then changing a few ceramic disc capacitors I still have the same problem. Should I start on changing caps leading from board ground to case in the radio?

I changed c191 with another new 10UF 35v capacitor it's still the same, that was the first thing I tried. If I follow the circuit it leads to a resistor that goes into the audio amps and regulators through a few caps I've changed already, I might have to go in deeper onto the line that leads...

His antenna is grounded at the base with a ground rod, radio is hooked to a 72 amp power supply on the same wall the computer is. The difference in his setup and mine is I run solar and battery on all my equipment with charge controllers limiting the voltage from over charging, but I run my...

One of my problems I have is I can't isolate board ground from chassis ground (radio side). My shielded wire in the radio for DI is going to L5 board ground and the metal on the headphone port I installed has ground/shield on the radio I have touching chassis ground with no insulation in...

So it seems like a floating ground but maybe in the radio? Laptop still works fine on my di55

I'm using my 55 on the same hp laptop that I'm trying the 55 that is not working right, mine still works this one does not. My buddy uses I believe a dell desktop, his computer is why it stopped working lol. I'll have to see what he wants to do with it. He might upgrade to a newer tower is what...