Motorola roundie

[timmy]

Got the coil out it’s official the slug is cracked in 3 places so at one time someone was in there and must have broke it I don’t know but I do know it was not me my tool slipped from the beginning.

[Yamamaya42]

Originally Posted by timmy

Well I don’t have a choice now I have to cut the connections on the coil and pull it out because my plastic tool was slipping in the hole and upon a closer look it looks like the slug has 2 cracks in it. I have a new slug but it’s a spec longer then what it looks like the one in there. My guess is the longer slug should work.

If the Part# matches, it should work, does not matter if it looks diff.

[timmy]

No all I have is the slug not the coil itself and I got the broken slug out and the one I have is a spec longer

[Yamamaya42]

all you can do is try it, not sure what affect it will have, if you cant get it to lock in, you can always shave the longer core down to size with some sandpaper, it IS soft and easy to re-shape.

[timmy]

Originally Posted by Yamamaya42

all you can do is try it, not sure what affect it will have, if you cant get it to lock in, you can always shave the longer core down to size with some sandpaper, it IS soft and easy to re-shape.

Well it turns out it was the exact size as the old one. I made a gauge for the top and bottom and was able to tell it was the same as well as getting the new slug back in the original spot.

[Yamamaya42]

so next, is getting it tuned to the " sweet spot" to where it's locks in!

[timmy]

Originally Posted by Yamamaya42

so next, is getting it tuned to the " sweet spot" to where it's locks in!

Well I certainly hope it locks in since I don’t know how it would have came out of sync unless it was the cracked core that maybe changed the frequency. So I’ll find out when I get it back in.

[Yamamaya42]

Originally Posted by timmy

Well I certainly hope it locks in since I don’t know how it would have came out of sync unless it was the cracked core that maybe changed the frequency. So I’ll find out when I get it back in.

That was highly likely the problem,a broken ferrite core will give you VERY unpredictable results, and react to temperature and vibrations, I dare say even if you look at it funny!

[timmy]

So this core could have been cracked all along not knowing and then just start giving problems. How would they crack does age do this or temperature.

[old_tv_nut]

Originally Posted by timmy

So this core could have been cracked all along not knowing and then just start giving problems. How would they crack does age do this or temperature.

AFAIK core cracking is usually due to attempts to force a stuck core, especially if with the wrong tool; not age.

[timmy]

Got the coil back in and adjust it out 5 turns rainbows disappear adjust in 5 turns rainbows come back but no lock.

[timmy]

The phase detect resistance is not right pins 1-2 should be 1.5 and 1.6meg I’m coming up with around 500k the other 5-7 are right 220 ohm. I tried another 6al5.these pins cannot show meg ohms because there are 2 470 resistors there tied with the 1.5-1.6 meg resistors so it would only show the lower ohms of the 470 befor the high meg ohm resistors. I don’t know why sams would show this unless it’s an error

[Yamamaya42]

The SAMS is correct, the resistance check has little to do with the values of the 2 470ks but the coupled value of both pins through them.

R173 is 2.2 meg, so it will be less than that to ground, for both pins 1-2, you may want to try removing V22, and measuring the resistance for pins 1 and 2 to ground with the tube out.

[timmy]

I removed the tube and oddly enough I touched pin 2 and it showed 1.6meg momentarily and then went to 500k never seen anything like befor otherwise tube out made no difference

[timmy]

Originally there was some voltage on pins 1-2 but now there is no voltage there now.