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817,1012 mod regs test good 2003v 5 pin mod amp replaced with a new one lifted all legs on the irf520s removed shorting board then found the issue with the 8 volt rail have tested about half of the electros and ceramic caps working back to the mod regulators.

q35 tested good, haven't pulled the diodes yet I started with the electrolytic caps first but I didn't think the regulator should be 13 volts on the collector when lifted just wanted to verify my starting point was good before continuing. Wasn't sure if the circuit pulls that 13 volts down to 8...

Having issues with the 8 volt rail. It has the sa1869 regulator in it 2.4 volts on the collector when attached lift the leg it goes to 13 volts, removed it tested it on 2 different testers show good no leakage? I've tested components before that showed good when in fact they were faulty! If I...

UPDATE got it straightened out. Well almost had to use vr803 and vr13 to set high and low dead key. Found a few more ceramic caps bad one was on the bottom of the board some missing diodes as well and a few low resistors. All set at 30 watts pep am and ssb Thanks Mike SP5IT for your help...

Yes the power on the front will adjust vr 13 sets the high side vr 16 sets the low side, it supposed to but it doesn't no variable what so ever. Thanks for the link but it's just like the ones I'm using no tr35,39 or 48.

Low Bias driver/finals 2166/2312 x2 No ALC vr#12 No low power adjustment vr#16 I'm trouble shooting these circuits I've came to tr#35, tr#39 (marked tr30 on board, just in front of transformer t1 one voltage labeled this a talk back tr, no talk back in the 2980?) and tr#48. I've been thru the...

hey mike just to let you know the bias was really low on the driver i've got it up some and the ssb dead key is gone. But it still needs more bias thats next. Driver bias .50ma am should be about 75 if memory serves me right. Finals (2) will only come up to 53ma am. ssb driver is .002 finals are...

hey bc just to let you know the bias on the driver was really low i've got it up some and elimanated the ssb dead key. It still needs some more bias so thats next. thanks Ira

Question if fl3 10m4d was damaged would the tx/rx on sideband align on frequency?

dead key is equal on usb and lsb vr 7 makes minimal difference. IC 3 voltage is good.

RCI 2980 EPT360014B 3 problems Thread starter ira parker Start date Friday at 5:54 PM Tags None REPLY Unwatch I ira parker Member Friday at 5:54 PM Add bookmark #1 The short story, No tx got that resolved. Once tx was restored there is a 4-6 watt dead key on sideband ? Also only about...

The short story, No tx got that resolved. Once tx was restored there is a 4-6 watt dead key on sideband ? Also only about 10 watts output on ssb and vr#12 doesn't adjust it? AM works fine rx and tx, 22 watts out audio chain is good. Pll/vco took alignment just fine spot on frequency. Started Tx...

Sorry guys been under they weather a few days here. Update installed the new 1419 and 945 companion part voltages look good and steady. I've also found a clear copy of the voltage chart. So i went thru all the ic's and double checked voltages everything looks good there. Still losing voltage to...

I'm sure I have a 1419 some where have to dig them up, i just looked at the 1 in there now and its a sd1135 will have to look up the cross reference on that i know the original should be 1419 I've got some 945s for the companion part also. My schematic is blurry on the voltage reading for bce...

Thanks Andy all voltage test are done to board ground, I've also found some negative voltage on tr 12 of the meter circuit s/rf side works no modulation movement at all i'll have to look into that to see if its common to the finals, but i haven't found out why its not pulling down the bias...

receive all modes just fine, pa section works as should. has weak signal to monitor radio all modes. checked freqs all is good. pre driver is good has proper volts and is switching. in am mode has 12.8 volts to final and driver in receive switching to tx voltage drops to -9 volts. unplugged...

I posted this in the yaesu mods section also. considering buying one of these, not much info on the tx mod. anyone done one of these? wonder if it's the same as the 2900 mod ?

considering buying one of these, not much info on the tx mod. has anyone done this mod, is it the same as the ft-2900?