Re: Troubleshooting a 19K6100 series monitor

I got it working last night. I don't know why I thought the spot killer turned
the high voltage off, but now that I think about it... duh.
There were a couple of problems. 1) The high Voltage unit *was* the problem -
There was a bad trace near the -27v pin. 2) Somehow the 3.9ohm resistor must
have taken a hit at one point because it's resistance was something like
50ohms. So the voltage across it dropped by almost 2/3rds. The collector of
BU407 was only getting about 9volts. - I fixed a few other problems - but now
it works perfectly.

My description probably wasn't too good. I should have mentioned that I wasn't
getting any high voltage at all - not just that the focus voltage was missing.

Thanks guys....

Matt

Jon Raiford wrote:

> Do you have a second monitor you can use for testing? Swap out the HV,
> deflection, and neck boards and isolate which one has the problem. FWIW,
> my BattleZone had similar problems (Al, still no word on that other BZ)
> that turned out to be the inline connectors. I still haven't replaced
> them, but I found a sweet spot while playing around with wiggling them.
>
> Jon
>
> At 02:14 PM 3/16/2000 -0800, you wrote:
> >I'm working on a tempest monitor and almost have this thing working. In
> >fact, at one point I got the picture to come up. Here's the problem....
> >
> >The deflection board is working. The Tempest motherboard is working
> >100%. The spot killer light on the monitor stays off and I can hear the
> >deflection working happily away. The CRT is glowing like it should.
> >There is nothing wrong with the High voltage unit itself. I'm getting
> >proper voltages going it. The only problem I see is - I am getting zero
> >voltage going into the Focus assembley. For a while it was working but
> >then it shut itself off. I'm trying to figure out what is causing the
> >voltage go out. Could it be something on the neckboard that is causing
> >this?
> >
> >I'm not yet familiar enough with this monitor to know why the spot
> >killer would stay off and yet the focus assembly would get no voltage.
> >
> >Any ideas as to what to check?
> >
> >thanks....
> >
> >
> >Matt
> >
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Received on Fri Mar 17 13:19:28 2000