1979 GTE Sylvania GT Matic CX9164W chassis E24-3

[pac.attack76]

Put new tripler in and tested. Red breaker on back popped out tripped where do I look now?

[JohnCT]

Originally Posted by pac.attack76

Put new tripler in and tested. Red breaker on back popped out tripped where do I look now?

Did you check the horiz output transistor for Collector to Emitter short? If the tripler is punctured it would have arced out and likely damaged the output and possibly the LV regulator.

John

[pac.attack76]

Originally Posted by JohnCT

Did you check the horiz output transistor for Collector to Emitter short? If the tripler is punctured it would have arced out and likely damaged the output and possibly the LV regulator.

John

No I didn't. Can u point those out to me?

[JohnCT]

Originally Posted by pac.attack76

No I didn't. Can u point those out to me?

The horiz output will be located on the right side of the chassis near the tripler. One of your pictures shows a metal TO-3 (top hat) transistor held to the side of the chassis near the yellow label with two 1/4" screws. If it's on the right side of the chassis, that's the output (if it's on the left, it's the reg). You can check from the metal body to the chassis ground side rail. It should read open (over 100K ohms). If it reads short (a few ohms or less), the transistor is shorted.

The low voltage regulator would be located on the left side looking from the back. That also might be a TO-3 metal transistor mounted like the horiz output is. That transistor won't be shorted to the ground panel but you can test it by removing it from the chassis and checking resistance between the metal body and the two terminals.

John

[pac.attack76]

Originally Posted by JohnCT

The horiz output will be located on the right side of the chassis near the tripler. One of your pictures shows a metal TO-3 (top hat) transistor held to the side of the chassis near the yellow label with two 1/4" screws. If it's on the right side of the chassis, that's the output (if it's on the left, it's the reg). You can check from the metal body to the chassis ground side rail. It should read open (over 100K ohms). If it reads short (a few ohms or less), the transistor is shorted.

The low voltage regulator would be located on the left side looking from the back. That also might be a TO-3 metal transistor mounted like the horiz output is. That transistor won't be shorted to the ground panel but you can test it by removing it from the chassis and checking resistance between the metal body and the two terminals.

John

Ok I'll check and let u know.

[pac.attack76]

Ok, I set my meter to 200k and tried the one on the right by the trip and I get nothing. 00.0 and I took the one on the left out and nothing on that one either. Hope I did it right. I have a pic of the one from the left.

[JohnCT]

Originally Posted by pac.attack76

Ok, I set my meter to 200k and tried the one on the right by the trip and I get nothing. 00.0 and I took the one on the left out and nothing on that one either. Hope I did it right. I have a pic of the one from the left.

Let's be a bit clearer here - a reading of 00.0 on most DMMs means a dead short (you can replicate that same reading by shorting your leads together).

I've seen more than a thousand shorted horiz outputs in my life, and they all will short "hard", so if your meter isn't an autoranging type, put it on 200 ohms or 2K if that's all your meter has.

If the transistor is not shorted, then it will read the same at 200 (or 2K) as if you didn't connect the leads at all, figure something like OL on the display (means overload).

So if your meter is reading OL with the leads off and 00.0 with the leads on the horiz out, the output is shorted.

If your meter reads 00.0 with the leads open, the meter is bad.

John