1981ish Zenith System 3

[TVTim]

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[zeno]

Originally Posted by TVTim

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OK you got a 2nd generation system 3 using the 9-160 board.
First instructions on pulling the 9-160 from the set as best as
I remember. If its been out before some things wont apply.

Remove red key. it is center near rear of set. Often has tape around it.
Turn & pull out.
Remove plugs from top of board 4-5 of them IIRC.
Remove white holder along rear of board.
Remove metal or plastic brace from flyback to frame.
remove little black plastic things along rear edge connectors.
Remove edge connectors.
Push down on the frame at both ends of board the little tabs &
slide board out.
You can flip the board over & reconnect to service it now.
You can NOT put anything in the wrong place without forcing it,
just be careful not to bend the contacts on connectors.
If nothing else you will find lots of cold solder joints, go
over them first. More to follow.

73 Zeno

[zeno]

Jumping or bridging electrolytic caps
You need 2 clip leads & a good cap.
Cap must be equal or greater voltage.
Since most caps dont totally open one of less mfd will work.
You are looking for a cure or vast improvement in symptoms.

"filter cans" come with one - four sections. In other words 1-4
caps in one package.
ALMOST always the negatives are tied together.
This is the outer can part. It has 4 tabs, one keyed in a circle.
The positives are inside the circle. They are marked with triangle,
half moon, square & line.

Turn set off.
One clip lead to outer ring (-). Hook to - end of your cap.
Other lead to section to be tested (+) to + of your cap.
Turn set on & see results. Turn off & remove test cap.

DISCHARGE THE CAP by shorting + to - & enjoy the spark.
Move on to other sections if needed.
With solid state sets it is important to do the discharge between tests
& the hook up while off to prevent damage.

73 Zeno