Don't forget the common/ground upgrades that MUST be done to the
PCB/power supply/monitor connections. I am pretty sure it is covered
in the GO8 fireproofing FAQ somewhere or other.
John :-#)#
At 2:32 PM -0500 12/27/05, 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>http://www.excite.com
>The most personalized portal on the Web!
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Received on Thu Dec 29 11:07:08 2005
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