Re: Tech: G07 loses HV after 1 second

On Feb 26, 12:09 pm, dbpbandit <d...@xxxxxxxxxxxxxxxxxxxxx> wrote:
I'm glad you figured it out and thanks for posting your results so all
of us other "dumb" people can learn from it... ;^)

-Dave

On Feb 26, 8:46 am, "micrologix1...@xxxxxxxxx"

<micrologix1...@xxxxxxxxx> wrote:
On Feb 25, 10:54 am, "micrologix1...@xxxxxxxxx"

<micrologix1...@xxxxxxxxx> wrote:
On Feb 25, 10:15 am, Grauwulf <rictu...@xxxxxxxxxxx> wrote:

You don't measure across the resistor, you measure from one end of the
resistor to the frame of the chassis. That should give you the
readings you need to work from. The end closest to the front of the
chassis is the test point you want. Clip on to that and then try and
adjust your B+ down to 120V. If you can't, then you need to diagnose
farther.

On Feb 25, 8:48 am, "micrologix1...@xxxxxxxxx"

<micrologix1...@xxxxxxxxx> wrote:
Making a little progress now! with X701 out of circuit, it stays
running. Here's the strange part though.. I'm supposed to get 120V
across the big 220 ohm resistor? I'm getting 9V! just to make sure,
i switched over to AC and got like 1.6VAC @ 16 KHz.. but on the DC
scale, I'm only getting 9V. wierd huh? I checked the HV with my HV
probe, and it's right around 30K. The probe is used and of course it
hasn't been calibrated or anything, so I can't really count on the
accuracy of that reading..

Ok, I feel dumb now.. the B+ pot on the board was turned all the way
up. I brought it about halfway down and it's at a steady 120V. I'm
going to put X701 back in and see what happens. I wonder if that was
all that was "wrong" with it all along :)

Yup.. it's official, i'm dumb. put X701 back in and it's still running
fine. replaced a couple things that didn't need replacing but it was
a good learning experience!

Look forward to more "dumb guy + monitor" threads in the near
future :) I've got LOTS of messed up monitors and a little time to
work on them right now!

Just got the one I've been working on into my resurrected pac man
cab. fired right up and looks pretty good, except for one small
detail.. no blue at all! I guess I should start at the source and
figure out if this bootleg pac board is putting out a blue signal, and
work my way through from there.
.

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