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Sencore SG165 rf problem
#3

Thanks Mike, I did have it hooked to scope when checking the sine/ square wave ,not the fm frequency. With the tuning shaft broke after fixing , I was using an B&k 1gig frequency counter to test the fm frequency. The am is reading fine. I will have to reinstall the main rf board and transistors to get it back to look at on scope. I would think the fm should read on the frequency counter. The counter reads all the fm frequencies on my leader lsg 215a signal generator.
Before removing the main RF board I did check the volts from ground to base of the tr315. It read -12volts. according to manual oscillator tr314 runs only when there is 12v+ at base of tr315 turning it on and supplying emitter current to tr314. I don't know why it had 12v- at base. Thats why I thought I had a bad tr315 transistor. The molex plug to RF board from the power supply board have both -12v and 12v+. I will try to get the schematic downloaded and put up here.

http://s1336.photobucket.com/user/220koh...c.jpg.html
http://s1336.photobucket.com/user/220koh...b.jpg.html
Here is the rf section of the manual.


Messages In This Thread
Sencore SG165 rf problem - by KCMike - 05-14-2015, 01:18 PM
RE: Sencore SG165 rf problem - by morzh - 05-14-2015, 01:40 PM
RE: Sencore SG165 rf problem - by KCMike - 05-14-2015, 02:53 PM



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