I dont remember 8-track 4-channel., but I rember back in early seventies, there were receivers that were 4-channel(quadraphonic) all 4 outputs were equal, my father in law had a a quadraphonic marantz, have a good night. charles betzler Best Electronics repair1@xxxxxxxxxxxxx ----- Original Message ----- From: "art bevilacqua" <abevilac@xxxxxxxxxxxxx> To: <techassist@xxxxxxxxxxxxx> Sent: Friday, January 24, 2003 10:16 PM Subject: [TechAssist] Re: Ford AM/FM/8-track car radio > > This brings back a bit of a faint memory: maybe one of the others will > remember it better: > > There was an enhanced 8-track format that gave you four separate > channels: kind of early surround sound. I can't remember the name, > quadratrac? (or did I just see an Audi ad?). Anyhow, the movement of the > head would make sense if it were in the "4 channel" mode. I don't > remember exactly how the units switched from normal two channel to four > channel, but I seem to remember an additional switch finger at the front > side or bottom front of the tape cartridge that would slip into the > "4-channel mode" slot to get it into the proper mode for the cartridge. > > Check to see if you can see additional switches or fingers that may be > stuck or bent. > > Later, art > > > Art Bevilacqua > Essex Radio and TV > 40 Main Street > Essex, MA 01929 > > > -----Original Message----- > From: techassist-bounce@xxxxxxxxxxxxx > [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Webster TV > Sent: Friday, January 24, 2003 10:49 PM > To: techassist@xxxxxxxxxxxxx > Subject: [TechAssist] Re: Ford AM/FM/8-track car radio > > > Harry, > > Thanks for the input, and also thanks to Don, Leon, Peter, David and > Steve > for your responses. I'm going to have to do some more checking on this > unit > the first of the week.The original problem with the 8-track, was that it > wouldn't change tracks at all. I got the selenoid so that it now moves > the > head when you push the shaft to change tracks. I guess my question now > is > should the head be all the way up for track one, move down for track > two, > down more for track three and further down for track four? The head on > this > unit moves like this---track one the head moves up, track two head moves > down, track three head moves up, track four head moves down. Tracks > three > and four play fine, tracks one and two have no audio at all. If the head > wasn't moving to the right position for tracks one and two, wouldn't I > be > getting the audio from track three when it is in the first track and the > audio from track four when its in the second track? The reason I thought > it > might be the IC, I mentioned, is because I traced the audio with a audio > signal tracer off of the head to the input of one of the IC's you > mentioned. > When playing track three or four I have amplification coming out of the > IC. > When playing track one or two, I have the audio coming off of the head > going > into the other head amp IC, but no amplification coming out of the other > IC, > but that doesn't make sense, if you say they are front and back left and > front and back right head amp IC's. Sorry this explanation is so long, > I'll > let you know if I find the problem. > > Dan Webster > Webster's TV > Shullsburg, Wi. > ----- Original Message ----- > From: HARRY L BUSBIN <busbin@xxxxxxxxxxxxx> > To: <techassist@xxxxxxxxxxxxx> > Sent: Friday, January 24, 2003 4:24 PM > Subject: [TechAssist] Re: Ford AM/FM/8-track car radio > > > > > > Part number is 51-10726A02. This is the head amp ic. There are two, > for > > front and back left and front and back right. The usual problem of > this > > sympthom is that the head is not moving into proper position. A > mechanical > > problem usually. > > Harry L Busbin > > Busbin Electronics > > 113 South Main St. > > Fitzgerald, Ga. 31750 > > 229-423-5665 ph/fax > > ----- Original Message ----- > > From: "Webster TV" <webstertv@xxxxxxx> > > To: <techassist@xxxxxxxxxxxxx> > > Sent: Friday, January 24, 2003 2:11 PM > > Subject: [TechAssist] Ford AM/FM/8-track car radio > > > > > > > > > > Techs, > > > > > > Anyone have a Sams AR-274(auto radio manual), that you could look up > a > > part > > > # for me? I have this AM/FM/8-track car radio in for repair, that a > guy > > > wants fixed because he's restoring this 1978 Ford. I have everything > > > repaired on it except it will only play tracks 3 & 4 on the 8-track. > I've > > > traced the problem down to a IC in the 8-track circuit. The only # > on > the > > IC > > > is # T3D-1, and I tried crossing this # and found nothing. Oh, by > the > way > > > the radio is manufactured by Motorola, and the M# is 5LN4805. I have > no > > idea > > > if parts will even be available for this age unit, but the owner > wants > me > > to > > > fix it if possible. Any help would be appreciated. > > > > > > Dan Webster > > > Webster's TV > > > Shullsburg, Wi. > > > > > > ------------------------------------------ > > > Submit A Repair Tip For Everyone Here: > > > http://www.tech-assist.org/secure/tip/main.html > > > ------------------------------------------ > > > To REMOVE your email address, click here: > > > http://www.tech-assist.org/unsubb.html > > > To CHANGE your email address, click here: > > > http://www.techassist.net/forms/change.html > > > > > > > ------------------------------------------ > > Submit A Repair Tip For Everyone Here: > > http://www.tech-assist.org/secure/tip/main.html > > ------------------------------------------ > > To REMOVE your email address, click here: > > http://www.tech-assist.org/unsubb.html > > To CHANGE your email address, click here: > > http://www.techassist.net/forms/change.html > > > > ------------------------------------------ > Submit A Repair Tip For Everyone Here: > http://www.tech-assist.org/secure/tip/main.html > ------------------------------------------ > To REMOVE your email address, click here: > http://www.tech-assist.org/unsubb.html > To CHANGE your email address, click here: > http://www.techassist.net/forms/change.html > > > > ------------------------------------------ > Submit A Repair Tip For Everyone Here: > http://www.tech-assist.org/secure/tip/main.html > ------------------------------------------ > To REMOVE your email address, click here: > http://www.tech-assist.org/unsubb.html > To CHANGE your email address, click here: > http://www.techassist.net/forms/change.html > ------------------------------------------ Submit A Repair Tip For Everyone Here: http://www.tech-assist.org/secure/tip/main.html ------------------------------------------ To REMOVE your email address, click here: http://www.tech-assist.org/unsubb.html To CHANGE your email address, click here: http://www.techassist.net/forms/change.html