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

Thank you to EVERYONE who helped or attempted to help me get this amplifone going.  It is now up and running and I played my first game of Star Wars on it this morning (level 14, 3.1 million) and it looks good.  I need to do some minor adjustment on brightness levels of the colors and such but otherwise it's very nice.

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>
Subject: Re: VECTOR: Amplifone monitor - still stumped on bright dot in middle.
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 14:40:43 2011