GRC-160 no power up

[Jeepsinker]

I recently purchased this radio set from Airbornebandsman, and to be fair he did tell me beforehand that the radio did not work. Ive been reading through the TMs and speaking with Carnac about the issue and it seems to me that the problem is in the MT-1029/VRC base. There is supposed to be a printed circuit in the housing in the back corner with a jumper that you can change positions of, as well as provision for a 100 amp fuse. None of that is present. There are wires and such soldered to different contact points in there, as well as what appears to be a square white fuse? Anyway, here is a picture of what is inside of my 1029, and a pic of what the TM shows for comparison. Not sure if this is just a different production or what.

 

[ke5eua]

Do you have the TM-11-5820-498-35? It has some general troubleshooting for the base, but it references a crappy version of the picture you show in it also. Main thing is it has pinouts for vmm testing.

Here is where I found it http://www.liberatedmanuals.com/TM-11-5820-498-35.pdf

Here is the digital 12 http://radionerds.com/images/8/86/TM-11-5820-498-12.pdf

Edit:

After looking at the -12 I realize you probably did the pinout on 5-7 and that is what brought you to opening up the cover.

Sorry, I killed harmless electrons for no reason.

Now you could pull the white ceramic? piece out to get a better look at the inside and follow the power connector wires from the input to the output and see if they are actually connected to something.

I also noticed you are probably using 498-16 so it should have everything in one book?

 

[NDT]

If the 1029 is code F let me know I have numerous here.

 

[Jeepsinker]

I only have 498-12 and 498-35 here. I have removed the square ceramic piece and followed all the wires and they are all connected. I do not have a pinout list, that I know of anyway. Franz, will do, thank you sir.

 

[Jeepsinker]

I'm going to wire it up tomorrow in the deuce and give it another try. I simply was doing visual inspection of the component groups before hooking it to power again, being as Airbornebandsman informed me that it did not power up. I wanted to see if it may have been something obvious, and this issue with the 1029 is the only thing jumping out at me so far. Is the 1029 a common point of failure in the systems?

 

[Jeepsinker]

Ok, got the stuff hooked up temporarily today and could not get it to power up at first. After turning the power switches on the PRC77 and the AM 2060 on and off a few times it finally came to life. Maybe just some corrosion on the contacts but it seems to work now, granted I have no test equipment, but it does come on anyway.

 

[BillIdaho]

My dad once told me "nothing ever fixes itself".

If it is corrosion somewhere, it will reappear. Probably once and for all.

 

[Jeepsinker]

Yeah I had the case off already and saw no corrosion anywhere. Very very clean inside, but this radio did sit unused for a good wholesome the contacts probably did have some corrosion on them or maybe some crud. Makes no difference anyway as I'll be taking it all apart to strip and refinish soon anyway. It there is any corrosion or crud to be found I will find it.