eyeamnomad@excite.com wrote:
> Hello,
>
>
> I've been working on a Star Trek machine, and I'm stuck.
>
>
> First, there was a problem with the X-Y deflection board, in the power
> input section. The main fuses kept blowing and there was no deflection
> chatter. I replaced a transistor and a zener diode that were bad, and
> now that seems to be working fine. The chatter sounds normal and the
> fuses don't blow.
>
>
> There is still no picture, however, or heater glow. I have checked the
> voltages on the 10-pin connector on the HV unit, and all are normal,
> EXCEPT pin 7 (+6.3VAC for heater -- reads less than a volt) and pin 10
> (~400VDC for focus and brightness -- reads less than a volt). I don't
> have a HV probe, but when I attempted to discharge the 22KV from under
> the anode cup, nothing happened (usually there are a couple of snaps
> when I touch the scredriver to the metal housing) I swapped HV cages
> with a spare (untested) one and I got the exact same indications.
>
>
> The tube came from another broken Star Trek I bought (so now I have
> two broken ones, plus a third monitor board set for parts), so it has
> never been tested. But a bad tube should still have the 22KV at the
> anode, shouldn't it? So I don't suspect the tube. And even though the
> HV cages were also untested, the likelihood of both of them being
> defective in the same way seems low, so I don't suspect the HV unit.
>
>
> Is my logic flawed, and I SHOULD suspect the HV unit or the tube? Or
> is there a potential fault somewhere else that I'm overlooking? I have
> pored over the G08 monitor schematics in the ST manual, and Mark
> Jenison's G08 Vector Monitor Guide (aka FAQ v.1.0), and of course I
> searched the vectorlist but couldn't find these particular symptoms.
> Any ideas???
>
>
> PS I was supposed to have the machine fixed be Christmas!! It was for
> my wife!!
>
>
> PPS Happy Holidays!!!
>
> ------------------------------------------------------------------------
> *Join Excite! - http://www.excite.com*
> The most personalized portal on the Web!
Just because you hear "chatter" doesn't mean BOTH channels are running,
and if one isn't running the high voltage should shut down.
---------------------------------------------------------------------------
** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
** Please direct other questions, comments, or problems to chris@westnet.com
Received on Tue Dec 27 15:28:33 2005
This archive was generated by hypermail 2.1.8 : Tue Dec 27 2005 - 16:50:01 EST