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 Post subject: Macy's branded super-micro AM radio
PostPosted: Jul Fri 31, 2020 8:17 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 496
Location: moreno valley
I don't know if this teensy weensy super-micro radio is a lost cause or not. Green crud that has spread a bit to the board, old foam crud on the trace side, I can't figure out how to get the tuner cap loose from the case to turn the board over, and a ceramic cap simply fell out of it. But it came with the schematics to help figure out where the cap belonged if I can ever get the board + tuner out. Anybody have experience with getting the tuner loose from these? It's labeled under Macy's so it must have been manufactured under other brand names. Okay to have it on the shelf but I would love to get it working. Thanks!


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 Post subject: Re: Macy's branded super-micro AM radio
PostPosted: Jul Fri 31, 2020 10:22 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 496
Location: moreno valley
When I lift up the end of the board I now can see there is one bolt holding the tuner, if I can reach it with a socket. Weird thing is the schems show five or six +/- electrolytics, but I'm only able to identify two by looking at the chassis. Everything else looks like resistors and ceramic caps(?) Do some of these look like electrolytics that I'm not familiar with? And of course the loose cap is marked .02uf but I don't see any .02uf on the schematics. Likely if fell off the trace side of the board but exactly where who knows.


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 Post subject: Re: Macy's branded super-micro AM radio
PostPosted: Jul Fri 31, 2020 11:42 pm 
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Posts: 13496
Location: Mountains of Mourne. Ireland.
Your schematic appears to be for this model?
https://www.radiomuseum.org/r/fantavox_ ... _8001.html

The links above lead to other radios and a (Standard branded) Photofact!

Greg.


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 Post subject: Re: Macy's branded super-micro AM radio
PostPosted: Aug Sat 01, 2020 12:01 am 
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Location: Mountains of Mourne. Ireland.
A similar-ish 1965 Photofact service manual and some ? notes from Mitch, attached.

Greg.


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 Post subject: Re: Macy's branded super-micro AM radio
PostPosted: Aug Sat 01, 2020 3:12 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 496
Location: moreno valley
Mine is also a model 8001 so it's the one on RadioMuseum. Now I think I see the other electrolytics, boy are they tiny, never saw 0.1 uf ones before. Must be one more hidden in there. I guess I'll try just changing the two 'big' 30uf ones and see if that wakes it up (totally dead now on speaker and earphone) but I think that's the most I'll be able to do with such tiny parts and traces. I don't expect this one to come out well but will give it a shot. If I can't figure out where that ceramic cap goes, the whole thing is off anyway. Thanks!


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 Post subject: Re: Macy's branded super-micro AM radio
PostPosted: Aug Sat 01, 2020 3:21 am 
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Location: SoCal, 91387
I have a few of the micro radios, and all but one work as I bought them that way. They're really too damn small for me to work on.

The Electrolytic's I believe are Tantalum Capacitors, the Mustard colored units.

The green crap is common for these, and I believe came from the batteries that were used with them, as it's usually most prevalent in the battery compartment.

_________________
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\He Who Dies With The Most Radios Wins/////////////////////////


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 Post subject: Re: Macy's branded super-micro AM radio
PostPosted: Aug Sat 01, 2020 3:38 am 
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Location: Mountains of Mourne. Ireland.
Meticulously clean all of the trace using IPA and a soft toothbrush.
I use 70% (strength) isopropyl alcohol... mixed 50/50 with regular nail varnish remover (acetone), it leaves no residue.

70% IPA is a superior cleaner for this task.
keep the hard stuff for... viewtopic.php?p=3192382#p3192382

A single pencil line on a circuit board (between traces) can wreak havoc or shut it down completely.


Take your time cleaning that trace side of the board, and watch out for those tiny single strand litz wire connections.
I get multi-packs of cheap toothbrushes in the grocery store, and really soft ones for babies in the pharmacy.


Greg.


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 Post subject: Re: Macy's branded super-micro AM radio
PostPosted: Aug Sun 02, 2020 5:29 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 496
Location: moreno valley
Thanks for the tips. On second thought I am now poking around on RM and elsewhere first, downloading pictures/docs of identical chassis to see if will help me figure out where that darn ceramic cap was located. I figure I need to get that sorted out before bothering with any recapping just yet. I don't know if one missing ceramic could completely kill the radio like this though, my guess would be no, but... onward!


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