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The Fisher 440-T FM Receiver
#9

Not a good day today.

I installed the remaining electrolytics and replaced the AC line bypass cap, only to find that I had lost audio in the right channel.

What the heck? Icon_eh I checked and doublechecked wiring...nope, no wiring errors...no solder bridges. Icon_confused Icon_think Output and driver transistors are OK...voltages at the output transistors seem to be OK...and going by the signal tracer, it even seems to have a clean signal all the way through the output coupling capacitor. But the output transistors became quite warm, and it appears two of those little 3 watt resistors connected to one of the output transistors were stressed by something as they just have that "stressed" look (darker than the other, similar resistors).

I should have quit while I was behind. But, oh no, I just had to attempt to clean that front panel using a procedure I had found at AudioKarma.

Something told me not to soak the panel, so I just used some warm water and detergent. I stopped when some of the lettering came off around the far right knob. Icon_sad

Then I attempted using polish, as suggested...and quit when I polished off the bird that was the Fisher logo. Icon_evil Icon_redface Icon_e_surprised Icon_cry

Yup, there are some days when you should not attempt any work at all on electronics...

--
Ron Ramirez
Ferdinand IN


Messages In This Thread
The Fisher 440-T FM Receiver - by Ron Ramirez - 03-01-2014, 10:51 PM
RE: The Fisher 440-T FM Receiver - by morzh - 03-01-2014, 10:54 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-01-2014, 11:00 PM
RE: The Fisher 440-T FM Receiver - by morzh - 03-01-2014, 11:08 PM
RE: The Fisher 440-T FM Receiver - by skyscraper - 03-01-2014, 11:13 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-01-2014, 11:18 PM
RE: The Fisher 440-T FM Receiver - by skyscraper - 03-01-2014, 11:26 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-02-2014, 09:37 AM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-02-2014, 08:08 PM
RE: The Fisher 440-T FM Receiver - by BrendaAnnD - 03-02-2014, 10:22 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-02-2014, 10:26 PM
RE: The Fisher 440-T FM Receiver - by morzh - 03-02-2014, 10:34 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-03-2014, 10:10 AM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-03-2014, 11:08 AM
RE: The Fisher 440-T FM Receiver - by Mondial - 03-03-2014, 11:20 AM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-03-2014, 12:54 PM
RE: The Fisher 440-T FM Receiver - by Mondial - 03-03-2014, 01:17 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-03-2014, 01:28 PM
RE: The Fisher 440-T FM Receiver - by morzh - 03-03-2014, 01:51 PM
RE: The Fisher 440-T FM Receiver - by BrendaAnnD - 03-03-2014, 02:46 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-03-2014, 04:25 PM
RE: The Fisher 440-T FM Receiver - by morzh - 03-03-2014, 04:48 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-03-2014, 04:51 PM
RE: The Fisher 440-T FM Receiver - by Mondial - 03-03-2014, 05:16 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-03-2014, 06:50 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-03-2014, 06:51 PM
RE: The Fisher 440-T FM Receiver - by Mondial - 03-03-2014, 07:21 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-03-2014, 09:53 PM
RE: The Fisher 440-T FM Receiver - by BrendaAnnD - 03-03-2014, 10:56 PM
RE: The Fisher 440-T FM Receiver - by Mondial - 03-03-2014, 11:39 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-04-2014, 10:53 AM
RE: The Fisher 440-T FM Receiver - by Mondial - 03-04-2014, 11:14 AM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-04-2014, 07:58 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-10-2014, 08:45 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-13-2014, 05:53 AM
RE: The Fisher 440-T FM Receiver - by BrendaAnnD - 03-13-2014, 10:09 AM
RE: The Fisher 440-T FM Receiver - by morzh - 03-13-2014, 10:21 AM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-13-2014, 04:40 PM
RE: The Fisher 440-T FM Receiver - by Mondial - 03-13-2014, 06:05 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-13-2014, 07:01 PM
RE: The Fisher 440-T FM Receiver - by Mondial - 03-13-2014, 08:05 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-13-2014, 08:08 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-13-2014, 08:10 PM
RE: The Fisher 440-T FM Receiver - by Mondial - 03-13-2014, 08:36 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-13-2014, 08:37 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-13-2014, 08:43 PM
RE: The Fisher 440-T FM Receiver - by Mondial - 03-13-2014, 08:50 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-13-2014, 08:55 PM
RE: The Fisher 440-T FM Receiver - by Mondial - 03-13-2014, 09:07 PM
RE: The Fisher 440-T FM Receiver - by BrendaAnnD - 03-13-2014, 10:12 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-15-2014, 10:07 AM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-15-2014, 11:22 AM
RE: The Fisher 440-T FM Receiver - by Mondial - 03-15-2014, 11:34 AM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-15-2014, 12:16 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-15-2014, 06:35 PM
RE: The Fisher 440-T FM Receiver - by BrendaAnnD - 03-15-2014, 09:01 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-15-2014, 10:39 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-16-2014, 03:41 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 10-04-2014, 10:34 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 02-20-2015, 11:33 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 02-26-2015, 10:12 AM
RE: The Fisher 440-T FM Receiver - by morzh - 02-26-2015, 12:09 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 02-26-2015, 09:05 PM
RE: The Fisher 440-T FM Receiver - by morzh - 02-26-2015, 11:17 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-03-2015, 12:46 PM
RE: The Fisher 440-T FM Receiver - by morzh - 03-03-2015, 01:07 PM
RE: The Fisher 440-T FM Receiver - by PhilcoMike - 03-03-2015, 03:37 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-03-2015, 03:42 PM
RE: The Fisher 440-T FM Receiver - by morzh - 03-03-2015, 04:19 PM
RE: The Fisher 440-T FM Receiver - by morzh - 03-03-2015, 04:43 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-03-2015, 09:56 PM
RE: The Fisher 440-T FM Receiver - by morzh - 03-03-2015, 10:39 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-03-2015, 10:46 PM
RE: The Fisher 440-T FM Receiver - by morzh - 03-03-2015, 10:52 PM
RE: The Fisher 440-T FM Receiver - by morzh - 03-03-2015, 10:57 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-03-2015, 11:04 PM
RE: The Fisher 440-T FM Receiver - by morzh - 03-03-2015, 11:12 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-04-2015, 11:03 AM
RE: The Fisher 440-T FM Receiver - by PhilcoMike - 03-04-2015, 12:50 PM
RE: The Fisher 440-T FM Receiver - by morzh - 03-04-2015, 02:21 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-04-2015, 02:36 PM
RE: The Fisher 440-T FM Receiver - by morzh - 03-04-2015, 02:44 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-04-2015, 06:41 PM
RE: The Fisher 440-T FM Receiver - by morzh - 03-04-2015, 06:44 PM
RE: The Fisher 440-T FM Receiver - by PhilcoMike - 03-06-2015, 02:17 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-06-2015, 02:50 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-11-2015, 02:49 PM
RE: The Fisher 440-T FM Receiver - by morzh - 03-11-2015, 03:44 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-11-2015, 03:58 PM
RE: The Fisher 440-T FM Receiver - by morzh - 03-11-2015, 06:46 PM
RE: The Fisher 440-T FM Receiver - by codefox1 - 03-14-2015, 10:26 AM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-14-2015, 10:15 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-17-2015, 08:34 PM
RE: The Fisher 440-T FM Receiver - by PhilcoMike - 03-18-2015, 01:17 PM
RE: The Fisher 440-T FM Receiver - by Ron Ramirez - 03-18-2015, 01:53 PM



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