[TechAssist] Re: Ford AM/FM/8-track car radio
- From: "Webster TV" <webstertv@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 24 Jan 2003 21:48:49 -0600
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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