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 Post subject: Repair of a RCA RJC30
PostPosted: Aug Wed 07, 2019 6:08 pm 
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Joined: Jan Tue 01, 2019 5:04 pm
Posts: 2
Decent looking walnut cabinet. And the radio does work, although not very well.
I'm wondering what a novice as me might be able to do to diagnose and/or repair it.
I have some basic knowledge and ability. ie: I could replace caps. I could make some measurements internally, if I knew where or what to measure. I doubt there is a source for a schematic on this item. It's probably a mid to early 70s model. Just guessing.
And that's about it.
Any help or direction would be appreciated.
Update... It does work on am but get no signal at all on fm. Also a low hum when powered up.


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 Post subject: Re: Repair of a RCA RJC30
PostPosted: Aug Wed 07, 2019 11:24 pm 
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Joined: Jan Tue 31, 2012 1:55 am
Posts: 13036
Location: Mountains of Mourne. Ireland.
Manufactured around late 1967

Service information for radio chassis RC-1232A/B/C/D/E/F/H can be found in...
Sams Photofact Set-946 Folder-7

Image
Large image: https://i.ebayimg.com/images/g/VpAAAOxy ... -l1600.jpg
The Photofact cover image of a clock radio is a representative image.

Original copy $6.98 shipped...
https://www.ebay.com/sch/i.html?_from=R ... 7&_sacat=0


RJC30W - suffix W is for walnut cabinet.
Image

Many other models were covered by Set-946 Folder-7
ref: https://www.samswebsite.com/en/photofac ... msid/946_7

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If you have the patience, the pages can be downloaded from radiomuseum.org for free.
https://www.radiomuseum.org/r/rca_rjs55 ... 1232e.html

Downloading from radiomuseum.org (non members).

Click a schematic page from the right-hand scrolling window, then again in the main center window.
Each page will be emailed to you immediately. You can only download three pages a day + up to a maximum of ten every 30 days.

If you experience any downloading difficulties... see this→ viewtopic.php?p=2571007#p2570117
pdf attachments are not visible in junk email folders.
pictorial - how-to→ http://a4.pbase.com/o10/56/215056/1/166 ... titled.png

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SOP (standard operating procedure) is to replace all the electrolytic capacitors as a first step. Resistors can fail open or short, alongside their value changing.
A good close visual inspection can often reveal circuit board troubles and suspect components.
For dry joints, touch them up (reflow) with your soldering iron.

Modern day electrolytic capacitors have become...
viewtopic.php?p=2804646#p2804646

Welcome to the world of radio... :)
Greg.

oh... check that the earphone socket is not gummed-up and working correctly.


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 Post subject: Re: Repair of a RCA RJC30
PostPosted: Aug Thu 08, 2019 1:27 am 
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Joined: Jan Tue 01, 2019 5:04 pm
Posts: 2
Thank you. Actually I am a member of radiomuseum. And I just today downloaded a picture of my set to that model. It's like the second one you've posted above. Mine is the 12932h.
What I'd like to do is just use this set to learn on. And mostly, what I'm looking for is where on the circuit board to test voltages to help diagnose the faults.
When I get some time I'm going to download the schematic to see if I can figure it out.


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 Post subject: Re: Repair of a RCA RJC30
PostPosted: Aug Thu 08, 2019 4:15 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 35173
Location: SoCal, 91387
As you might be aware, the hum is most likely caused by dried out Electrolytic filter caps, so you would want to change those first.
AFA the lack of FM reception, have you tried connecting several feet of wire separately to each of the FM antenna terminals?

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


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 Post subject: Re: Repair of a RCA RJC30
PostPosted: Aug Thu 08, 2019 5:11 am 
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Joined: Jan Tue 31, 2012 1:55 am
Posts: 13036
Location: Mountains of Mourne. Ireland.
Expected voltages will be shown on the schematic with their locations (test points) highlighted by a reference number in a black square - - the corresponding black square will again be shown on the photos of the trace side of the circuit-board.

Pay attention to the legend on the schematic... there will be a note specifying the type of test meter that was used when the Photofact was produced.


Chapter 14 of this 1959 115-page book by John Frye contains good information on Transistor-Set servicing.
Image
http://americanradiohistory.com/Archive ... e-1959.pdf 8.5MB

Greg.


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