#26 Yaesu FT 757GX no transmit quick repair
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- Опубликовано: 23 янв 2016
- In this video I have a look at a 757GX that has no TX. Owner changed meter lighting and created an interesting easy to fix fault.
Yes at times I do get something easy to repair.
Link
gokarters.com/smf/index.php?to...
Service manual
www.iw2nmx.it/Yaesu/FT-757GX/F...
Modifications and fixes
www.normsweb.com/tektips/ft757...
This is a real technician..and they way we do things. ..we use a schematic and we go step threw step threw the RF chain ..this insures that we are not leaving anything behind ..when u jump around ..u can spend all day to find a simple issue ..but when u use your equipment properly and go threw the chain of electrical RF path you most always find the issue.... Great great job... Real technician!!! Makes me smile ...
Just for anyone with no TX on the 757 you can’t remove the coax from the exciter board because it is diode switched and the switching voltage comes down the coax from the PA board so if probing leave the coax in. There should be 2-3 volts peak there on the oscilloscope. Thanks for the video
Way to easy, but not always the case, as seen here and on TRX Bench and Mr. Carlsen's Lab. Keep them coming, I'll keep watching.
amazin that the guy who had it apart doin the lights could not think this out....that it might be some movement of cables that HE DID and save time going to get it looked at..
Excellent video. I learned a lot.
Nicely done Buddy!
Appreciate it.
I like those simple repairs
+DENNIS N So do I :)
Nice job Buddy its nice when they go that easily its a shame we dont get more like this lol
+Gary g1fsh Thanks for the kind words Gary. These easy ones just may spoil me :-) I am sure I will get some tough ones soon....
nice ad easy... I have one of these radios... it is now my portable rig for activation of islands and parks and what have you when I want the full 100 watts... a bit heavy for too much backpacking, but love the radio... pretty hot receiver as well.. Thanks for another good video Buddy... 73...
Thanks Paul. Good radio.
It's nice to get an easier one every now and then isn't it my friend. Problem is the easy ones don't
normally turn up when you need them to :)
Cheers
John
+orbiter8 (John) Hello John, good to see you stop by. I had a feeling this one would be a simple fix since the owner did a little work, but at the same time was thinking it could had been a major failure. The way the 757 is designed it is so easy to short things out. They do not give you much slack in the cables once you break it apart. These are good radios but they do have CPU problems and are unobtainable. Luckily this one is in decent shape. Thanks for your comments my friend. Buddy
Nice to get a easy one every once in a while. Hope my turn comes up soon. :)
Mike
+MikesRadioRepair .CBRadio I agree Mike. Easy ones go quick. Only problem you do not get to learn much since very little troubleshooting is involved. Keep your head up, I am sure an easy one is coming your way :) Thanks for stopping in.Buddy
No BS and strait to the point ...only way ...period
I just picked up an FT-757GX with no power. I have NO experience diagnosing or fixing radios but may open it up and look for something obvious.. THanks
IT WAS SOMEHING SIMPLE! the "silicon" like stuff in the plug had become like a semiconductor over the decades and was shorting it. I scraped it out and powered up! Only with a little confidence gained by watching videos like this one!
Nice repair
+Grant Fullen Thank you Grant. Good to see you.
Hi Buddy, yeah that's how it can go :-) Nice and easy fix. Like it. Thanks for kindly mention my video:^) my friend. Take care Thumps up!
+TRXBench Yes my friend we have to take the good with the bad on some radios. I do not mind mentioning you in my videos. You have already helped my channel greatly and it is most appreciated. And as always thanks Peter :-)
nice easy repair
+mike charette Thank You. Good to have an easy one.
thank you
I recently bought a 757gx at a hamfest. It came with the FP 757gx power supply. When I attempt to apply power to the transceiver, relay R1 in the power supply opens and shuts the power down. There are no blown fuses on the radio. I have not tried connecting the transceiver directly to battery power yet. Any ideas watching on with the power supply? I tested the output of the power supply and it a steady 13.8 volts until I apply a load (the transceiver).
Jeff
Love your videos. I have watched about all of them now and have learned quite a few tricks. I do some modest repair videos too, AERVBlog but we can all learn can't we.
Question for you. I have aYaesu FT757GX (ebay find cheap) that I have mostly fixed but it still has a problem. When I transmit I can hear myself in the speaker. It is really bad on FM. I have changed all the diodes and checked about everything I can think of. Any ideas on this. Thanks
Dave
AERVBlog on youtube
I have a Yaseu ft-757gx with a PA board problem. Anyone know where I can but the power Transistors or a replacement PA board?
it is on board # 2 beside VR-02 thanks
Hello, I moved and my 757 GX was in a box for 16 years. I went to plug it in today (I have the antenna tuner and power supply for a complete stack)_ and I have no power. Is there someplace I can send it for repairs / like do you do repairs? I am in North Carolina.
Nice
Mi 757 gx dejo de trasmitir en 11 metros pero en 10 funciona bien y en bandas de radio aficionado y mi preferida es 11 metros
Would you happen to have an IC for this ft-757, MC1468050, Yaesu part #(SC82088P) my switch for the 500k step doesn't work, and I traced it to pin 15 of this chip, the voltage changes from 0 to 5V pressing the button, but 500k steps doesn't work
Sorry, no luck.
Still repairing older YaesuFT757GXs?? I have one with very poor receive in it.
Hi, Yes I am. You can contact me via the show more tab
Nice to have an easy fix every once in a while! What do you call those connectors? I know I've heard the name in the past but for the life of me can't remember it. I'd like to make up a couple to have around to make it easy to connect to the PCB side when looking at a radio that uses them. Looks like you could make a patch cable using RG-174 if you had new connectors and could crimp them.
+Dino Papas Hi Dino. Yes very nice to get an easy one. Those connectors are called TMP. I had to go ask to find out myself lol. And now I know the name of them think I will order a few spares. Thanks for your comment :)Buddy
+The Radio Shop Thanks Buddy, as soon as I saw TMD (Taiko-Denki) I remembered. INRAD has them and I just ordered some male/female PCB units along with a couple of 8" leads. Will stash them away for that Sunday afternoon when you say to yourself "Self, I sure wish I had one of those!" 73 - Dino
+Dino Papas Good deal. I still have a few that has been removed from old radios. Do you have the crimp toll for the male plug? I though my AMP pin crimp toll was high at 380 bucks. But these can run up to a grand. 73 Buddy
+The Radio Shop Nope, don't have that tool for sure! Have nice one for Powerpoles and coax which surprisingly does a pretty good job with terminals as well, and a RJ-11/45 crimper as well - they all come in very handy. I was a little reluctant at first with coax crimps but once I got the hang of it I only solder if I have to (and then use silver connectors only!). CUL.
how much did you soak the guy for taking up your time ! ?
Oh Yeah ... the way these "clam shell" 757 rigs are designed it's easy to pull out an inter-stage coax connector. BTW ... how do like having to remove that shield in order to accomplish a proper alignment? Yaesu put access holes in for only some of the trimmers. Nasty!
How do I contact you about a repair?
What transistors are used in the finals? Mines only putting out 2 watts I'm thinking the finals are about shot
I think they are 2sc2290
forgot to ask the Attenuator you used its 20 db how many watts is it ?
thanks I want make sure my SA stays safe I just use antenna on my sa no direct connection
+DENNIS N This attenuator is 150 watt unit. I cannot remember the model number but it came with my Com Ser labs service monitor when I bought it.Think it is switchable between 20 and 40 db. I will check on it and draw a schematic so you can build one.
Thank you very much
Does this connector has a name or something? It would be a pity if you could harvest it only from used 757
Awesome job ,I just bought one from EBay and found that L-44 is totally destroyed seem as if someone try a golden screwdriver job , I herd you have a junk radio can I purchase L-44 from you ?
+danny blackhorse Ah, I just looked and do not have it. Already been removed my friend. I know a few others that may have one and I will check and see. Thanks for your commentBuddy.
I have been following your videos, the one that you was cleaning the switches with white vingar, what I want to know is can I was my yeasu ft101 with this solution I will remove the vfo unit, all relays, meters tubes and transformer and front panel do you think submersing the rest of the transceiver in a tub of this solution would harm the radio cleaning thge radio this way. its dirty all inside and from what I gather it will remove the oxsidation throughout this unit . please email me back and give me your opinon on this thanks Charlie
FYI I tried this with an old television set. I took the case off, hosed it out with a garden hose and let it dry for several weeks to make sure the parts were completely dry. It worked fine.
Yes, it will work fine.
Well, sometimes an easy fix repair is welcomed but you never think it's going to be just an unplugged cable before opening the thing up.
Yes that is true lol.
do yo still work on radio's
Yes, but only a few. So busy here.
HI, I HAVE SAME RADIO AND I HAVE 2 PROBLEM THE DISPLY ANDTHE POWER OUT
Any luck working on them?
u should see the ft747 inside its a rat nest the newer ft radios r much nicer love the radio shop viedos kg6mn
Hi jerome, I hear they are terrible. Never worked on one of those. Thanks for your comment.
The Radio Shop
The Radio Shop
can i have yor Tel nr or call me I Pay you on Cash Up . only one Question for Swan model B 270
Those cheap little connectors are hard to repair.
Hello, just sub'd to your channel. I just sent you an email to ask you about a repair job for my Yaesu FT-757gx. It may be another easy repair for you, I hope. I am located in WV, not sure as to your location. Great information on your channel. Looking forward to watching all of them that you have uploaded. 73, Juddie WD8WV