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 Post subject: Motorola model 10Y questions
PostPosted: Sep Wed 05, 2018 6:34 pm 
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Joined: Sep Wed 05, 2018 6:27 pm
Posts: 9
I have been given a Motorola 10Y radio that I want to get working, I can not tell the chassis number because the sticker is half missing.
When I powered it on only the lights lite up, no sound at all. In looking at the drawings from Galvin Mfg. There are to items labeled elec cond., there is only the larger one in the chassis and a hole for the smaller one. Can any one give me information on these 2 items?
Heath Scott


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 Post subject: Re: Motorola model 10Y questions
PostPosted: Sep Wed 05, 2018 8:03 pm 
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Joined: Jan Tue 31, 2012 1:55 am
Posts: 13011
Location: Mountains of Mourne. Ireland.
Is this your chassis?

Image
image: arf member jkoebel
from: viewtopic.php?p=1368517#p1368517

Image

Double-page schematics...
https://americanradiohistory.com/hd2/ID ... e-0012.pdf ←schematic.
http://americanradiohistory.com/hd2/IDX ... e-0013.pdf

Welcome aboard... :)
Greg.


You can post photos as attachments straight out of the chute. No need to wait 24Hrs.

Posting photos to a forum thread...
The skinny: viewtopic.php?p=2717120#p2717120


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 Post subject: Re: Motorola model 10Y questions
PostPosted: Sep Wed 05, 2018 11:48 pm 
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Joined: Sep Wed 05, 2018 6:27 pm
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Its a little different


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 Post subject: Re: Motorola model 10Y questions
PostPosted: Sep Thu 06, 2018 12:29 am 
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Joined: Jan Tue 31, 2012 1:55 am
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Location: Mountains of Mourne. Ireland.
Ding-ding... round two... :)
Image
Schematic + parts: http://americanradiohistory.com/hd2/IDX ... e-0014.pdf

Other pages: http://www.nostalgiaair.org/Resources/501/M0006501.htm
from: http://www.nostalgiaair.org/Resources/

Greg.


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 Post subject: Re: Motorola model 10Y questions
PostPosted: Sep Thu 06, 2018 12:53 am 
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Sorry I messed up on the photo.


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 Post subject: Re: Motorola model 10Y questions
PostPosted: Sep Thu 06, 2018 12:56 am 
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Joined: Jan Mon 16, 2012 4:15 pm
Posts: 6431
Location: Near Brandon, Iowa
10Y-1 has the motor-driven station preset feature. 10Y does not have this.


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 Post subject: Re: Motorola model 10Y questions
PostPosted: Sep Thu 06, 2018 12:58 am 
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Here is another view.


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 Post subject: Re: Motorola model 10Y questions
PostPosted: Sep Thu 06, 2018 1:10 am 
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From what I have researched so far there were 2 different chassis in the 10y, a 10-1 and a 10-2. I am mainly concerned that something may be missing from this chassis.


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 Post subject: Re: Motorola model 10Y questions
PostPosted: Sep Thu 06, 2018 1:34 am 
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Joined: Jan Tue 16, 2007 7:02 am
Posts: 3694
Location: Lexington, KY USA
Show us the underside of the chassis and we will probably see the missing electrolytic capacitor. Look for something in a paper sleeve, shaped sort of like a longer flashlight battery, with wires out the ends.

It was common practice to use an axial lead part under the chassis as a replacement. All the electrolytics are probably shot, including any replacements installed long ago.

At least the guy didn't leave that old one connected.

Ted


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 Post subject: Re: Motorola model 10Y questions
PostPosted: Sep Thu 06, 2018 2:35 am 
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Posts: 6431
Location: Near Brandon, Iowa
Heathm0311 wrote:
From what I have researched so far there were 2 different chassis in the 10y, a 10-1 and a 10-2. I am mainly concerned that something may be missing from this chassis.

Model 10Y only used chassis 10-1; Model 10Y-1 used chassis 10-2. The major differences are: (1) the 10-2 supports motor-driven tuning presets (pushbutton select switch matrix; 24V secondary on the power transformer to run the reversible motor); (2) the 10-2 chassis has an AFC discriminator/local oscillator control circuit. Chassis 10-1 omits these features.


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 Post subject: Re: Motorola model 10Y questions
PostPosted: Sep Thu 06, 2018 6:48 pm 
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Joined: Sep Wed 05, 2018 6:27 pm
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Here are the chassis pics.


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 Post subject: Re: Motorola model 10Y questions
PostPosted: Sep Thu 06, 2018 6:54 pm 
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Joined: Sep Wed 05, 2018 6:27 pm
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You were correct Ted, the missing one was mounted underneath, I am planning on replacing all the caps. I need to also find a wave band knob. Are there any things i need to watch out for when working on this set? This is my first radio rebuild.
Heath


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 Post subject: Re: Motorola model 10Y questions
PostPosted: Sep Thu 06, 2018 6:56 pm 
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Joined: Sep Wed 05, 2018 6:27 pm
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Here is 2nd chassis pic


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 Post subject: Re: Motorola model 10Y questions
PostPosted: Sep Thu 06, 2018 7:35 pm 
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Joined: Jan Tue 16, 2007 7:02 am
Posts: 3694
Location: Lexington, KY USA
Before doing anything else, it's a good idea to check the continuity of all the coils and transformer windings. RF, IF, audio, and power. If you are lucky, you can find expected DC resistance values on a schematic. Otherwise you can ask here.

You can also check the power transformer. With the tubes unplugged, and a dim bulb in series with the AC line, apply power and verify that the transformer does not draw excessive current.

At this point you can also check the transformer secondaries for reasonable voltages. Determining what's reasonable includes considering the lower primary voltage due to the dim bulb, and the lack of any load.

If this goes well, run the unloaded transformer for a half hour or so with a higher wattage bulb to get close to normal line voltage across the transformer. Verify that the transformer gets only slightly warm.

If you want, you can see what happens with all the tubes except the rectifier plugged in. Best not to power the set with the rectifier until the electrolytic capacitors have been replaced.

Ted


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 Post subject: Re: Motorola model 10Y questions
PostPosted: Sep Sat 08, 2018 3:04 am 
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Joined: Sep Wed 05, 2018 6:27 pm
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Ok Ted thanks for the info. I will let you know if I cant find the resistance loads.
Heath


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