Guess my Sega Star Trek problem

demogo

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And I'll be very happy.

Seriously, here's a screenshot from my system when I press the diagnostics button. The first screens that it flashes through look like this:

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The later diagnostic screens are fine.

Now here's the kicker -- the game seems to work fine but there's obviously something arfed with the diagnostics themselves.

Thoughts? Opinions?
 

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That image looks fine...are you saying this is the first screen? Hence, for some reason, it's skipping the first diagnostics screen, which is the RAM / ROM check screen?
 
That image looks fine...are you saying this is the first screen? Hence, for some reason, it's skipping the first diagnostics screen, which is the RAM / ROM check screen?

Yes, when I press the button this is what I get. I never see a ram/rom check screen, I assumed that's what it was trying to display there.

If I press buttons at some point it switches to later diags screens where it plays game sounds if I recall correctly.

But according to the manual there should be a couple of screens at the beginning but I just get this garbled text instead.
 
This is not garbled text; this is the standard color bar and convergence screen test for Star Trek. But the screen before this should do a RAM/ROM report. Never seen a ROM/RAM check skipped issue before; the test code is in the EPROM on the CPU board, but if there was something wrong with it I would have doubted the game would have booted at all.
 
The screens before the color test pattern run by real fast so you might not be seeing them because you have to push the red button on the CPU board that's in the card cage so the test pattern is shown by the time you get back around to the front of the game. Here's a video of the test mode so you can see how quick it is. After you get to the color test screen pushing player one advances to the next screen.
 
The screens before the color test pattern run by real fast so you might not be seeing them because you have to push the red button on the CPU board that's in the card cage so the test pattern is shown by the time you get back around to the front of the game. Here's a video of the test mode so you can see how quick it is. After you get to the color test screen pushing player one advances to the next screen.

LOL -- I bet you're right. It's probably going by too quickly for me to get back out front to see it. :)

I'll retest this sometime this weekend.

Hmmm. I noticed your color test screen is rectangular whereas mine isn't. My right and left sides don't seem to be straight.

Is this normal or is something wrong? Is this a pincushion adjustment on the monitor???

Now I'm wondering if this isn't related to my curvy vertical line question I posted in the other Star Trek thread.
 
LOL -- I bet you're right. It's probably going by too quickly for me to get back out front to see it. :)

I'll retest this sometime this weekend.

Hmmm. I noticed your color test screen is rectangular whereas mine isn't. My right and left sides don't seem to be straight.

Is this normal or is something wrong? Is this a pincushion adjustment on the monitor???

Now I'm wondering if this isn't related to my curvy vertical line question I posted in the other Star Trek thread.

Yes, your image is a bit "rounded" I noticed. No controls on the monitor to help with this.

I assume your monitor has the input protection board as shown in this image?

http://www.arcadecup.com/images/monitors/g08.jpg

If so...well, you can either live with it, or try a few things:

swap in a new xy pair
fool around with the yoke placement/magnetic strips
make sure monitor has correct tube
swap monitor deflection boards
reduce voltages
adjust height/width/size controls to reduce effect
 
Yes, your image is a bit "rounded" I noticed. No controls on the monitor to help with this.

I assume your monitor has the input protection board as shown in this image?

http://www.arcadecup.com/images/monitors/g08.jpg

If so...well, you can either live with it, or try a few things:

swap in a new xy pair
fool around with the yoke placement/magnetic strips
make sure monitor has correct tube
swap monitor deflection boards
reduce voltages
adjust height/width/size controls to reduce effect

Mark, is the input protection board the white one that is down and to the right of the neckboard?
 
Mark, is the input protection board the white one that is down and to the right of the neckboard?

Yes that's what Mark was talking about. They are usually mounted to the metal bar on the monitor like in the picture but on my Asteroids conversion they mounted it on the lip of the wood shelf the monitor sets on.
 
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