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Archie
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 Posted: Thu Sep 06, 2007 10:57 am Post subject: Proscan CTC169EJ5, vertical chip location |
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I can not see to physically find the vertical chip on this set. Chassis CTC169EJ5, model PS35123. Can some let me know where is the physically location. I look every where but can not find it.
Thanks,
Joe |
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Mike
Guest
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| Posted: Thu Sep 06, 2007 10:57 am Post subject: |
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| it doesnt use a vertical chip. it uses an SCR for vertical. |
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Dewayne
Guest
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| Posted: Thu Sep 06, 2007 10:58 am Post subject: |
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| U4501 is the vertical output IC. It is an 8 pin DIP. |
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JoeJoe
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| Posted: Thu Sep 06, 2007 10:58 am Post subject: |
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Well, unfortunatly U4501 is an LM311N
that drives SCR501, vertical output.
Does anyone know how an SCR works?
What is even more interesting
there really is no B+ feed
for the vertical sweep.
Joe |
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John
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| Posted: Thu Sep 06, 2007 10:58 am Post subject: |
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Joe , U4501 is called the vertical switch, an 8 pin dip, (LM311N). SCR501
next to it is the vertical switch, p/N 197591. |
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Peggs
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| Posted: Thu Sep 06, 2007 10:59 am Post subject: |
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| The Yoke wires should go straight to it. |
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JohnP
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| Posted: Thu Sep 06, 2007 10:59 am Post subject: |
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Joe an scr conducts when it`s gate is triggered with a positive voltage,
just like a transistor does. It stays on until its anode or supply
crosses into the negative region.. That is the only way to turn it off.
So normally you will have a pulse on the anode so that you can actually
turn the device off. |
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Ed
Guest
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| Posted: Thu Sep 06, 2007 10:59 am Post subject: |
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If I remember correctly CTC169's use two vertical O/P transistors, and
not an IC..but I'm guessing. Unless you are a Tech, not prepare to spend
much time looking it up.
-Ed- |
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Tom
Guest
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| Posted: Thu Sep 06, 2007 11:00 am Post subject: |
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The most common cause for loss of vertical sweep on the CTC169 is a broken
solder connection on the yoke lead(s) where they attach to the board or on
the return capacitor (large square blue capacitor).
good luck Tom |
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