AM/FM Cassette deck resto-updatification - JeepForum.com
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post #1 of 9 Old 02-05-2019, 07:57 PM Thread Starter
walkerhoundvm
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AM/FM Cassette deck resto-updatification

Evening everyone,
I'm working on an early 80s Jeep analog am/fm/cassette deck (model #3240715).


I have a spare (digital) deck in very good working order, so I feel comfortable tinkering with this one, and I have a couple of objectives for it. I wanted to post a mini build thread in case it might help or motivate someone else.

1) get it back in good working order. The radio was working, but when playing cassettes the speed was "slurred" - slowed and variable when playing, but after FF/REV the speed would very briefly be normal. I thought it might be the motor, but when I cracked it open and tested it, it seemed to be fine (but worth replacing anyway). The belt, on the other hand, looked to be twisted and a little loose. The pinch rollers look pretty good, but I haven't gotten a good look at the gears yet.

I ordered a new motor and a belt kit to see where that gets me. In the meantime, I'm taking my time removing the mechanism from the deck.


I think I'll just have to pull a bunch of the wires in order to release the mechanism so I can get better access to the belt and gears. (Note - this is the first time I've worked on electronics since I took apart a Walkman when I was a kid)

2) whether or not I can get the cassette player working, I had another goal: to add a Bluetooth receiver. Several other members have come up with nice "hacks" to get an aux port into old units like these, but I want a deeper integration if I can.

An aux port is the fallback option, my goal is to incorporate a Bluetooth receiver into the unit somehow. In theory, here's how I see it working. First - a Bluetooth receiver powered by 12v:


There's a diy on YouTube showing a way to incorporate these sorts of diy boards into a CD deck
, but I think this one's going to be easier and more straightforward, since it's sort of a pass-through device until it makes a Bluetooth connection.

Next, get power from somewhere. That should be relatively easy to do with a voltmeter to find a good place to tap into where the wiring comes in.

Third, and most critical: plugging the output in somewhere. I think the deck I have is a little more complex than most, but it does have what I think is an ideal insertion point:


I believe that gray line is a common audio line (i.e. both radio and cassette) into the amp, with white, red, and black wires. I'm going to test that theory this weekend with a diy audio probe hooked up to a spare phone, with the deck fired up by a 120v to 12v adapter and some old speakers.

I'm definitely a novice, like I said, I haven't cracked open any electronics this complicated since I was a little kid, and maybe this is all a pipe dream. I do think I should be able to at least replace the motor and belt. If that's as far as I get, so be it, but I'd like to at least see how feasible it would be to get a direct wired Bluetooth receiver in there somehow.

Appreciate any constructive criticism, and welcome any comments. I'll update as I make progress, but this project will likely stretch over a couple months as I wait for parts from China.

Oh - and if anyone knows for sure what's what for the connectors, that'd be awesome. I think I can feel my way around, but there's one pigtail with ground, orange and brown (acc and switched, I assume, but I'm not 100% sure which is which), and a separate white spade that may hook up to the dimmer switch?

Thanks for following!

*edit* the white spade is definitely a dimmer attachment. I hooked up a 9v battery and ground and the FM light came on... But none of the others (am, frequency backlights). So I ordered some leds to see if replacing them gets those operational.

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post #2 of 9 Old 02-05-2019, 08:02 PM
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post #3 of 9 Old 02-06-2019, 03:23 AM
John Strenk
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I do like that board but how will you run the antenna?


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post #4 of 9 Old 02-06-2019, 05:22 AM Thread Starter
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Quote:
Originally Posted by John Strenk View Post
<img src="https://www.jeepforum.com/forum/images/smilies/popcorn.gif" border="0" alt="" title="PopCorn" class="inlineimg" />

I do like that board but how will you run the antenna?
I'll probably port it out the side or the back. I'll have to figure that out when I'm starting to put it all back together. The antenna is a blessing, most of these little units just have the on-board antenna, which may or may not work well trapped in the steel housing of the deck.

There's plenty of space on the internal top left hand (volume) side, and top middle area. I noticed the board has the four securing points to take advantage of as well.

It's Chinese new year so the boards won't even get shipped for another week &#x1f615;
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post #5 of 9 Old 02-06-2019, 07:25 AM
John Strenk
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Does it come with the antenna?

I have an old Jeep AM non-pushbutton radio that has ceased to function and was thinking it would be cool to put one inside with a small amp.
Cool to get an old 12 volt tube amp.....

I think you are correct about the grey cable being an audio line to the amp in that radio.


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post #6 of 9 Old 02-06-2019, 07:53 AM Thread Starter
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Quote:
Originally Posted by John Strenk View Post
Does it come with the antenna?

I have an old Jeep AM non-pushbutton radio that has ceased to function and was thinking it would be cool to put one inside with a small amp.
Cool to get an old 12 volt tube amp.....

I think you are correct about the grey cable being an audio line to the amp in that radio.
Yep, antenna included. There are a few other variants on eBay and alibaba that either don't have the antenna or the wiring connectors. This one has everything necessary as far as I can tell.

There really are a wide range of boards out there - some have built-in amps so you could probably replace the entire guts of an AM radio and turn it into a BT receiver.
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post #7 of 9 Old 02-07-2019, 07:05 AM
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This seems like an interesting project. I'm excited to see how it goes. I suppose that if you get the cassette player working, you could always go this route.

https://www.amazon.com/HEIBAIGE-iTap...+adapter&psc=1
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post #8 of 9 Old 02-09-2019, 05:42 PM Thread Starter
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Wife and kid went out of town this weekend so spent some time on this today.

First, got into the cassette mechanism to replace the motor and get a belt measurement (16.2", 1.2mm) so I could order a couple online.



Also replaced all of the leds so they're working. Backlights:



Am:



Fm:



Now to wait on the belt and the Bluetooth unit. I'll test everything out to make sure it all works before hand as soon as I can get the belt in.
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post #9 of 9 Old 02-15-2019, 07:46 PM Thread Starter
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Belts (16.2") and motor (Mabuchi EG-530AD-2B) came in this week. Spent a lot of time tinkering with the install, and eventually realized the motor was adjustable. Took a few attempts to get it right, but it seems to be playing at speed - maybe a touch fast in the forward direction and a touch slow in reverse, but even slight changes throws it off.

Have it playing on loop now just to see how well it does for a few hours, but wanted to post a short video. This literally brought a tear to my eye and took me back to high school - which may have been the last time I listened to this particular cassette.


Still waiting on the Bluetooth receiver, but if I'm able to try out the audio probe tomorrow I'll post another video.
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