RE: Asteroids GO5 help

I have checked pins 7 and 8 on the EHT unit and they show a short...I am
using a dmm and have it set to diode test. I get the beep when touching
pins 7 and 8. I guess this is why the fuse blows...

Now, how do I isolate the short?

Ron

-----Original Message-----
From: owner-vectorlist@synthcom.com
[mailto:owner-vectorlist@synthcom.com]On Behalf Of Ron
Sent: Wednesday, October 02, 2002 3:09 PM
To: vectorlist@beacon.synthcom.com
Subject: VECTOR: Asteroids GO5 help

This is my first attempt at vector repair. Before I owned the machine it
lost video. The owner took it to a retired tv repair guy. He replaced 2
transistors, 1 rectifier and 1 fuse. This was written on a piece of paper.
Unfortunately he did not note the locations of the parts. I am assuming he
replaced f102 because that is what still blows.

When I got it, f102 was blown, spot killer is off, of course there is no 40v
going to the EHT.

I have the schematics, and have watched the Randy Fromm xy repair video.

Here is what I have done. After blowing f102 again, I removed it, unplugged
P500 from the deflection board, and powered up. I checked for dc across
pins 6 and 7 and got 40.3v. F102 does not blow with P500 unplugged. Does
this mean the problem is in the EHT cage?

I am not an electronics wiz....and I know that sometimes circuits don't
react the same when there is no load etc.

I am also unsure of discharging the tube. I have read that you need to use
resistors to insure you won't damage something in the EHT cage. Is this
correct?

Thanks for any and all advice,

Ron

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Received on Wed Oct 2 14:57:01 2002