|
|
|
#1
04-16-2009, 06:58 PM
|
|||
|
|||
|
Help with Zenith M730
I am working on an AM/FM/AFC Zenith M730 from around 1965. I have replaced the selenium rectifier and the paper and electrolytic caps. It sounds good, but I am still having one problem with the FM. The FM drops out repeatedly. What is odd is that if I switch to AM and then back to FM, the signal returns, until it drops out again. I am guessing that there is a problem with the band switch itself. I was wondering if anyone has seen this before or has any suggestions on troubleshooting the problem. Thanks.
|
|
#2
04-16-2009, 07:02 PM
|
||||
|
||||
|
Spray the band switch with deoxit or other good control cleaner. After 40 years, these switches become dirty and cause the exact same problem you described. Probably would also be a good idea to clean the tube sockets with deoxit. Let everything dry and it will probably work fine.
|
|
#3
04-16-2009, 09:12 PM
|
|||
|
|||
|
Thanks for the suggestion. That's what I suspected, as I fixed a scratchy volume control on another radio by cleaning it, but wasn't sure about this one.
Update: That was the problem. Cleaned it up and working well now. Thanks again. Last edited by tacitapprova; 04-17-2009 at 07:53 AM.
|
 |
|
|
Linear Mode
