Re: Tech: G07 loses HV after 1 second

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!
.

Relevant Pages

  • Re: Tech: G07 loses HV after 1 second
    ... resistor to the frame of the chassis. ... readings you need to work from. ... The probe is used and of course it ...
    (rec.games.video.arcade.collecting)
  • Re: Tech: G07 loses HV after 1 second
    ... You don't measure across the resistor, you measure from one end of the ... resistor to the frame of the chassis. ... readings you need to work from. ... The probe is used and of course it ...
    (rec.games.video.arcade.collecting)
  • Re: Flash Gordon problems rectifier board?
    ... One note - if you're measuring the rectifier board test points w/ the ... you'll get readings that don't appear correct. ... flashes, so I think your issues lie in the MPU board, as Tim ... The 600 ohm ceramic resistor gets pretty freaking hot and looks ...
    (rec.games.pinball)
  • Re: TECH: wg-k7000 issues
    ... it resembles a k7000 to me but chassis isn't same as i found diagrams ... to go out get a few caps and resisters for my chopper board sorry ... >and then only pull a leg when the value is off. ... >friggin resistor in a particular circuit to find a bad one. ...
    (rec.games.video.arcade.collecting)
  • Re: HELP TECH: Electrohome G07
    ... I can check the R908 resistor like you suggested and let you ... Could I swap this chassis and if so ... the high voltage protection may be kicking in. ... this thing is still dead! ...
    (rec.games.video.arcade.collecting)