Electrolydics polarity

10/27/2008 10:38:32 PMDan Livesay

Hello:
I am trying to restore an RCA model 300 radio record player.I have not been able to get the polarity right on the five electrolydics.If someone could send me an email with a marked schematic I would certainly appreciate it. My email is listed.

10/27/2008 11:50:59 PMPeter G. Balazsy

Hi Dan:

I thought I'd just take a quick helpful peek at your schematic and try to lend a little help.
.. but trying to decipher that screwy old-style drawing has me pulling my hair out.
Pardon me now...while I look for a gun to shoot myself ... sorry.. I didn't think I'd be that confused....lol

10/28/2008 1:04:32 AMWow

That is one hard to follow schematic. Pass me the gun when you're done!

:Hi Dan:
:
:I thought I'd just take a quick helpful peek at your schematic and try to lend a little help.
:.. but trying to decipher that screwy old-style drawing has me pulling my hair out.
:Pardon me now...while I look for a gun to shoot myself ... sorry.. I didn't think I'd be that confused....lol

10/28/2008 11:01:09 AMLewis Linson

That just about HAS to be the worst schematic I have ever seen.

Lewis

:That is one hard to follow schematic. Pass me the gun when you're done!
:
::Hi Dan:
::
::I thought I'd just take a quick helpful peek at your schematic and try to lend a little help.
::.. but trying to decipher that screwy old-style drawing has me pulling my hair out.
::Pardon me now...while I look for a gun to shoot myself ... sorry.. I didn't think I'd be that confused....lol

10/28/2008 11:01:18 AMLewis Linson

That just about HAS to be the worst schematic I have ever seen.

Lewis

10/28/2008 2:17:03 PMEdd

Fustest. . .considering that. . . I AM using the correct schema,. . .and I DO see the pony-graf moder down at the bottom. . . . .

Looks like you are going to be reworking a voltage -doub-li-mi-fier-a-cating power supply system.

All of the relevant filter capacitors have been located and marked up.

Ye olde Blown-up RCA 300 Schema:

73's de Edd

10/28/2008 4:01:36 PMR Meyer(66844:66839)

Edd, excuse the language but damn your good.
Rick

10/28/2008 5:15:16 PM*lights a cigarette afterwards*(66845:66844)

:Edd, excuse the language but damn your good.
:
:Rick

10/28/2008 6:33:18 PMLewis Linson(66851:66845)

::Edd, excuse the language but damn your good.
::
:Rick

A-greeeed
Lewis

10/28/2008 5:56:12 PMrickd(66847:66839)

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:Fustest. . .considering that. . . I AM using the correct schema,. . .and I DO see the pony-graf moder down at the bottom. . . . .
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:Looks like you are going to be reworking a voltage -doub-li-mi-fier-a-cating power supply system.
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:All of the relevant filter capacitors have been located and marked up.
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:Ye olde Blown-up RCA 300 Schema:
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:73's de Edd
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Nicely done, as usual.
So the motor runs all the time, even if the radio is being used?

10/28/2008 7:50:53 PMPeter G. Balazsy(66856:66847)

Wow... glad to see I'm not alone here in the insane asylum that I quickly checked myself into after reading that print!
EDD ... yes! You are "the man"... but even though you've explained it as a voltage doubler and marked it up nicely... my feeble brain still can't figure out how that rectum-fire is working!.
Seems that the right-plate and left-cathode are tied together? connected to AC and the left-plate is the ground? and the right-cathode is DC?... huh?
Please shoot me again...lol

10/28/2008 8:09:10 PMLewis Linson(66858:66856)

:Wow... glad to see I'm not alone here in the insane asylum that I quickly checked myself into after reading that print!
:
:EDD ... yes! You are "the man"... but even though you've explained it as a voltage doubler and marked it up nicely... my feeble brain still can't figure out how that rectum-fire is working!.
:Seems that the right-plate and left-cathode are tied together? connected to AC and the left-plate is the ground? and the right-cathode is DC?... huh?
:
:Please shoot me again...lol
Peter:
What we have here is a plain ole full wave bridge Voltage doubler, with C18 and C19 being the doubling capacitors. It looks like a full wave diamond rectiifier, with the right hand diodes replaced by caps. Redraw it and it will make a whole lot more sense.
Lewis
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10/28/2008 9:04:50 PMDan Livesay(66862:66847)

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::Thanks Edd--You are better than good.You are unbelievable Dan Livesay
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::Fustest. . .considering that. . . I AM using the correct schema,. . .and I DO see the pony-graf moder down at the bottom. . . . .
::
::
::
::Looks like you are going to be reworking a voltage -doub-li-mi-fier-a-cating power supply system.
::
::
::All of the relevant filter capacitors have been located and marked up.
::
::
::
::Ye olde Blown-up RCA 300 Schema:
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::73's de Edd
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:Nicely done, as usual.
:So the motor runs all the time, even if the radio is being used?