I just wanted to share this with ya'll. I'm sure some of you have dealt with this issue before. I am no tech or guru, just enjoy the hobby. So if I leave anything out please jump in here.
I work on my coworkers radios from time to time. We pull dump trailers so these radios take a beating. I have had quite a few that would jump through frequencies. Turn the radio on and the counter would start at say
27.195mhz, and climb to the 30's. Those that weren't a vco or xtal problem, I would start poking around the solder side around the pll.
I noticed while touching up solder joints in this area, there would be wax in the old solder, and some of
the components were not making connection.
Leave the components in the board. One joint at a time, make sure to remove all the old solder. I use a solder sucker then a desolder braid. Melt away any wax residue with your iron just before resoldering. Sometimes you will see some wax residue roll off the joint when youre done. I've done 5 or 6 radios this way with no problems.
I don't know how common this problem is, but it seems to be common where I work. Lol
Have no idea if the wax is there from production, or if it just seeps through after time in a hot vehicle.
Just wanted to give a heads up. Hopefully this will help troubleshoot some rolling frequency issues.
I work on my coworkers radios from time to time. We pull dump trailers so these radios take a beating. I have had quite a few that would jump through frequencies. Turn the radio on and the counter would start at say
27.195mhz, and climb to the 30's. Those that weren't a vco or xtal problem, I would start poking around the solder side around the pll.
I noticed while touching up solder joints in this area, there would be wax in the old solder, and some of
the components were not making connection.
Leave the components in the board. One joint at a time, make sure to remove all the old solder. I use a solder sucker then a desolder braid. Melt away any wax residue with your iron just before resoldering. Sometimes you will see some wax residue roll off the joint when youre done. I've done 5 or 6 radios this way with no problems.
I don't know how common this problem is, but it seems to be common where I work. Lol
Have no idea if the wax is there from production, or if it just seeps through after time in a hot vehicle.
Just wanted to give a heads up. Hopefully this will help troubleshoot some rolling frequency issues.
