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 Post subject: Zenith Have no Am/Fm where should I start?
PostPosted: Feb Mon 05, 2018 7:16 pm 
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Joined: Apr Tue 07, 2015 2:36 am
Posts: 247
Location: Waterford MI
Thanks for looking at my post!

I just recapped this zenith I do have output in the amplifier its working good. But I have 0-Zero Am or Fm reception where would you start schematic Below,


Last edited by mark K on Feb Mon 05, 2018 10:24 pm, edited 1 time in total.

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 Post subject: Re: Zenith Have no Am/Fm where should I start?
PostPosted: Feb Mon 05, 2018 8:59 pm 
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Joined: Apr Tue 07, 2015 2:36 am
Posts: 247
Location: Waterford MI
doing some voltage testing

Q201 1st am-fm Amp

C=12v
B & E = I have NO volts

Where does the voltage come in from here?


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 Post subject: Re: Zenith Have no Am/Fm where should I start?
PostPosted: Feb Mon 05, 2018 9:23 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 36533
Location: Livermore, CA
Hi Mark

Voltages start on page two, toward the right. Squares numbered 1 through 5, marked source. Measure there and work back through resistors and coils.

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Norm


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 Post subject: Re: Zenith Have no Am/Fm where should I start?
PostPosted: Feb Mon 05, 2018 10:16 pm 
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Joined: Apr Tue 07, 2015 2:36 am
Posts: 247
Location: Waterford MI
Thanks Norm Found it to much solder in the 10mfd cap it connected +/- together.


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 Post subject: Re: Zenith Have no Am/Fm where should I start?
PostPosted: Feb Tue 06, 2018 12:00 am 
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Joined: Jan Tue 31, 2012 1:55 am
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Location: Mountains of Mourne. Ireland.
one-page schematic. jpg
http://a4.pbase.com/o10/56/215056/1/166 ... titled.jpg

Greg.


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 Post subject: Re: Zenith Have no Am/Fm where should I start?
PostPosted: Feb Tue 06, 2018 3:24 am 
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Joined: Apr Tue 07, 2015 2:36 am
Posts: 247
Location: Waterford MI
Thanks for the one page schematic :)


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 Post subject: Re: Zenith Have no Am/Fm where should I start?
PostPosted: Feb Tue 06, 2018 5:30 am 
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Location: SoCal, 91387
So is it fixed?

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 Post subject: Re: Zenith Have no Am/Fm where should I start?
PostPosted: Feb Tue 06, 2018 6:22 pm 
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Joined: Apr Tue 07, 2015 2:36 am
Posts: 247
Location: Waterford MI
Yes traced it back to a cap I replaced had the solder connecting the +/- together.


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 Post subject: Re: Zenith Have no Am/Fm where should I start?
PostPosted: Feb Tue 06, 2018 6:53 pm 
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Location: Ann Arbor, MI
mark K wrote:
Yes traced it back to a cap I replaced had the solder connecting the +/- together.

You should always not do that as often as you can. :)

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Tom


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 Post subject: Re: Zenith Have no Am/Fm where should I start?
PostPosted: Feb Wed 07, 2018 10:50 am 
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Joined: Jan Mon 16, 2012 4:15 pm
Posts: 4127
Location: Near Brandon, Iowa
Tom Schulz wrote:
mark K wrote:
Yes traced it back to a cap I replaced had the solder connecting the +/- together.

You should always not do that as often as you can. :)

If not even more often!


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