The Fisher 440-T FM Receiver

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The Fisher 440-T FM Receiver

Ron Ramirez
Silent Key

Posts: 13,776
Threads: 580
Joined: Sep 2005
City: Ferdinand State, Province, Country: Indiana

#60

02-20-2015, 11:33 PM

Well, since I have (more or less) managed to get my 700-T going, I decided to revisit my 440-T.

It has heavy distortion in both channels, which I have traced to...the control amplifier board. Both channels go into the control amplifier clean, and come out dirty.

So I've pulled the control amplifier board from a 550-T junk set I have, and will do the same thing with it as I did with the board I put into my 700-T, and that is to replace all of the electrolytics and the 0.33 uF film caps. I will also go over every solder joint on the board, as I did with the 440-T board which I put into my 700-T.

As for the multiplex decoder...

I built a prototype multiplex decider based on the LM1310 chip, and temporarily installed that perfboard in this 440-T. It seems to work...at least, I can tell a difference between FM stereo and FM mono...but it does not produce sufficient voltage to light up an LED stereo indicator. And I hooked everything up according to the schematic I found online for the circuit used with this IC. ?????

However, since then I discovered that the original Fisher multiplex decoder board that was in this 440-T is the same board used in the 220-T. I have the 220-T service info, so if I have to go back to original, at least now I have some voltages on the 220-T schematic which I can use as a reference.

--
Ron Ramirez
Ferdinand IN

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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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