Re: Amplifone monitor - still stumped on bright dot in middle.

Well it didn't hurt that the guy had it set for 3 extra shields for destroying the Death Star. :)  I actually fly by the seat of my pants. Don't really do the levels the same way each time.  But I do use the force and get all the towers on most levels. Not all of them though.  I never fire in the trench at all even when I should.  Or else I'd do much better probably!

But yes, it's good to have this beast working again. Thanks!

--- On Fri, 8/5/11, Jordan B <vg30.510@gmail.com> wrote:

From: Jordan B <vg30.510@gmail.com>
Subject: Re: VECTOR: Amplifone monitor - still stumped on bright dot in middle.
To: vectorlist@vectorlist.org
Date: Friday, August 5, 2011, 12:10 PM

John, good to hear you got it going again. 3.1 million on your first game? You must have those trenches memorized! Use the force and get all the towers every time?
Jordan B

On Fri, Aug 5, 2011 at 11:38 AM, John Huie <jehuie@sbcglobal.net> wrote:

Several people mentioned possible issues with the spot-killer circuit and that was apparently what the problem was.  An extra thanks to Mr. William Boucher for providing the helpful details!  I replaced Q10, Q11, Q26 and the 4.3 volt zener diode this morning (somewhat arbitrarily) and fired it up!

Thanks again for all of your tips.  I may be slow but with your help it's back to life!

--- On Tue, 8/2/11, William Boucher <wboucher6@cogeco.ca> wrote:

From: William Boucher <wboucher6@cogeco.ca>

To: vectorlist@vectorlist.org
Date: Tuesday, August 2, 2011, 8:58 AM

http://www.biltronix.com ----- Original Message ----- From: John Huie To: vectorlist_at_vectorlist.org Sent: Saturday, July 23, 2011 8:05 PM Subject: VECTOR: Amplifone monitor - still stumped on bright dot in middle.

Here's what I've tried so far:

- Bought a whole slew of components from Bob Roberts to rebuild the deflection board and HV board
- HV is good.
- B+ is good.
- Adjusting color drives doesn't help.  Brightness down and the color drives up still won't let me turn down dot enough to see graphics well.
- I don't have any spare parts to swap in. I only have 6100 vectors other than this.
- double checked continuity from focus block wiring, all connections under boots are good. Good continuity back to HV board and color drives on deflection board are good.
- Pins on neck not shorted to heater pins.  (Except pin 4 which isn't used - could this be a problem?)
- W jumpers are all long gone.
- Resistors in neck board/ring are good.
- Does same thing with known working PCB set.
- Reflowed J103 and tested continuity along wires.
- Ground to neck board/ring is good.

Still not sure how to check Z signal. What components should I be looking at that are common to all 3 colors that could be causing this?

Any other idea?

Thanks everyone. I'm working on this for a friend of mine and just about at the end of my rope.

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Received on Fri Aug 5 15:18:37 2011