Re: Bzone Project:

Well typically I replace the pots for Bip and Size with new ones. It does
appear to be a Bip problem, at least partially. The Diagonal lines in test
mode should line up with the edges of the bounding box.

You might also check the values of R71-72 76-77 those are 1% values. There
are also some small caps C63-64 &44, you might try replacing those along
with the Transistors Q2-3 to help eliminate any transients.

IIRC Some people replace the 200ohm Bip pot with a 300 to give a bit finer
adjustment.

I haven't spent much time on BZ boards, but the Tempests I work on that's
what I do.

As for your linearity, it looks pretty close.

Hopefully someone with a bit more experience will chime in.

Kevin

On Sat, Feb 20, 2010 at 11:33 PM, <litterbox99@mchsi.com> wrote:

> It's a bit quiet, so I guess I'll talk about
> my current project I've been working on.
>
> Bullet proofing my Bzone cabaret.
>
> This game has been flaky since day one, but as we
> all know this hobby has it's maintenance issues.
>
> What I've done so far:
>
> http://home.mchsi.com/~litterbox99/graphics/all.jpg<http://home.mchsi.com/%7Elitterbox99/graphics/all.jpg>
>
> New Reproduction CP Rubbers Rings. (did this a long time ago)
> New "Big Blue" cap.
> New interconnect cable.
> Capped monitor, HV checked, 12 KVDC and solid.
> Capped Audio II Reg.
>
> http://home.mchsi.com/~litterbox99/graphics/reg.jpg<http://home.mchsi.com/%7Elitterbox99/graphics/reg.jpg>
>
> Aux PCB: Replaced Bit Slice sockets w/machine pin sockets, added
> heat sinks to IC's.
>
> Replaced BiPolar sockets w/machine pin sockets & replaced
> BiPolar ROMs w/"Biltronix" Custom IC's.
>
> http://www.biltronix.com/battlezone_2.html
>
>
> http://home.mchsi.com/~litterbox99/graphics/aux1.jpg<http://home.mchsi.com/%7Elitterbox99/graphics/aux1.jpg>
> http://home.mchsi.com/~litterbox99/graphics/aux2.jpg<http://home.mchsi.com/%7Elitterbox99/graphics/aux2.jpg>
>
> Main PCB: Replaced CPU socket w/machine pin socket, added "Braze
> Technology" High Score Saver (also eliminates need for
> original game EPROM's)
>
> http://home.mchsi.com/~litterbox99/graphics/braze.jpg<http://home.mchsi.com/%7Elitterbox99/graphics/braze.jpg>
>
> Since my upgrades, this game has been rock solid (knock on wood)
> but despite caping the monitor, the vectors are not really straight.
>
> You can look at the following pic's;
>
> http://home.mchsi.com/~litterbox99/graphics/bz1.jpg<http://home.mchsi.com/%7Elitterbox99/graphics/bz1.jpg>
>
> http://home.mchsi.com/~litterbox99/graphics/bz2.jpg<http://home.mchsi.com/%7Elitterbox99/graphics/bz2.jpg>
>
> notice the "H" in 'high score' isn't complete.
>
> http://home.mchsi.com/~litterbox99/graphics/bz3.jpg<http://home.mchsi.com/%7Elitterbox99/graphics/bz3.jpg>
> http://home.mchsi.com/~litterbox99/graphics/bz4.jpg<http://home.mchsi.com/%7Elitterbox99/graphics/bz4.jpg>
> http://home.mchsi.com/~litterbox99/graphics/bz5.jpg<http://home.mchsi.com/%7Elitterbox99/graphics/bz5.jpg>
>
> The vectors are not quite straight and it looks like the
> drawing stroke stops early. Maybe a slew rate issue with the monitor ?
> I didn't notice this with the other monitor but the HV diode
> took a crap so this is a spare monitor.
>
> Am I expecting too much ?
>
> My Asteroids cocktail has the same monitor and the vectors are nice,
> clean and full stroke.
>
> I've tweaked the POT's on the CPU PCB for the BIP settings and got
> it as close as I can. Looks like the monitor (G05-805) deflection PCB has
> a
> few POT's for adjusting the linearity, but I haven't tried that just
> yet.
>
> Any thoughts on the monitor issue ?
>
> Well that's enough for tonight !
>
> Todd
>
> My Collection:
>
> http://home.mchsi.com/~litterbox99/pikx.html<http://home.mchsi.com/%7Elitterbox99/pikx.html>
>
>
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Received on Sun Feb 21 00:56:59 2010