I know that it is hard to fix tuner section without scope, but I don?t=20 have it, so if someone can help me without using scope, this would be=20 fine. I will write what I did until now about non working tuner:
- First, now I can catch two FM local station but signal is very weak, I=20 have some movements on tuning meter when I seeking stations from 88 MHz=20 to 108 MHz, but signal meter is always on 0 (because FM signal is always=20 weak). Because of that I mean that local oscillator is good on front=20 end.
- I have changed FET01 with new one
- I have changed TR01 and TR02 on F2714 and TR01 on F2919 with the same=20
2SC1674- All resistors are good (I checked) and I have replaced C02, C07, C14,=20 C25 and C28 on F2919
- I have replaced IC03 on F2919 HA1137W
After all, the tuner doesn?t work!
Here there are results of measuring on F2714 Board: TR01 E-1.3Volts B-1.98Vlots C-13.42Volts
TR02 E-7.26Volts B-7.89Volts C-13.42Volts
And here
I finally I have one more question, If I damaged FET with ESD (but I=20 have shorted all legs of it with one wire, and when I connect it on=20 board, I removed this wire, I am only asking if?), doest it damaged FET=20 can pass FM signal or it cannot pass signal?
Regards!