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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Tuner problem
I know that it is hard to fix tuner section without scope, but I don?t
have it, so if someone can help me without using scope, this would be 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 have some movements on tuning meter when I seeking stations from 88 MHz to 108 MHz, but signal meter is always on 0 (because FM signal is always weak). Because of that I mean that local oscillator is good on front end. - I have changed FET01 with new one - I have changed TR01 and TR02 on F2714 and TR01 on F2919 with the same 2SC1674 - All resistors are good (I checked) and I have replaced C02, C07, C14, 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 http://public.carnet.hr/~zekalini/G8000FM_tuner.jpg I have schematic diagram of FM part of Sansui G8000 tuner I finally I have one more question, If I damaged FET with ESD (but I have shorted all legs of it with one wire, and when I connect it on board, I removed this wire, I am only asking if?), doest it damaged FET can pass FM signal or it cannot pass signal? Regards! |
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