[TechAssist] Re: Ford AM/FM/8-track car radio

  • From: "repair1" <repair1@xxxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Fri, 24 Jan 2003 22:29:53 -0600

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.
> > >
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