Star Wars Trilogy Upright help

Reddogg

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Hey guys, just scored a Star Wars Trilogy Upright in decent shape for $400!

It seems to be fully working, but when I run the memory test I get a bad IC 17, and IC 18, yet, I've played the game to completion already. Anyone know what these ICs do, and how to go about fixing them? (I don't know much about boards themselves).

Also, I've noticed some strange things happening with the settings. If I set the game settings to upright, like it should be, then my left and right controls are reversed. But, if I set it to the dx version, then they work normal.

Does that mean my board is actually the dx version?

I'm also looking for some new volume pots for the x and y directions. Anyone know where to get them, and how to know which one's to get (never replaced these things before).

Any help would be greatly appreciated, as I've looked for this arcade at a reasonable price for a while now. Selling a couple of others just to fund it.

Thanks KLOVers, and happy holidays!
 
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Well, since it says memory test, you might assume that the IC's tested are memory circuits =)
So, in other words it should be RAM (or ROM) circuits. I would guess that you can play for hours without any issues, as long as that specific memory cell reported bad isn't used.
However, if you got the skills I would recomend to have them replaced. Shouldn't be that hard to find any suitable replacements. I couldn't find any detailed schematics that says what model they are, but just read what's printed on the actual circuit and you'll know.

SEGA usually have 5k potentiometers for controllers in their games (correct me if I'm wrong for this paricular game) and that shouldn't be to hard to find either. You didn't say why you want them replaced though.

Here is a good siter for you: http://www.sauservice.com/manuals/STW_html/stwmain.html

P.S There is someone else here, that also have IC17 and IC18 reported as bad in the memory test: http://www.digitpress.com/forum/showthread.php?t=152659
Maybe it is a common failure? Anyone else here at this forum with the same experience?
 
I believe the volume pots need to be replaced because when I calibrate, it's almost impossible to get the numbers to stop jittering/jumping. Then, while playing, the sight jitters around the target I'm shooting at. Unless that's normal for the game to make it harder to hit the target, but it seems like it's a pot issue.

Damn...all this pot talk! :)

Yeah, I saw that other thread in the other forum too. I'll Google the video game trivia answers you need to register, and see if I can message that member.

I already have the .pdfs of the Manuals, but no IC or board schematics anywhere.

Thanks for the reply.

Update: I got a hold of the member from the other forum who said he fixed it, but he told me he was mistaken. Game started to freeze on him, and bad IC check came back. However, mine hasn't frozen...yet.
 
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Just a thought, is there a battery on this board for remembering high scores? Could it be related to that?

Update: no, not related.
 
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Bad rom error = out of luck!

***WARNING: WHAT YOU ARE ABOUT TO READ...IS A BIT OF A RANT!***

Well, I got a hold of Sega, and ordered 2 replacement roms, IC 17 and 18, but both still come up as bad on the memory test.

I didn't order them until after I checked out my board(s), and re-socketed the roms. I found them to be in amazing condition! One of the cleanest boards I've ever gotten in an arcade purchase! And I mean NOTHING is wrong, visually, with them. But, still 2 bad rom errors? WTF?

I think there might be a manufacturing glitch Sega isn't telling people about, so they can charge to repair it. This makes sense to me in a few ways: 1) I'm not the only person to experience this problem; 2) there aren't any tech docs referring to why these 2 roms in particular would come up with errors, even when new (and again, I'm not the only one to experience the problem); 3) there are no schematics for the boards for anyone, other than Sega, to go thru and review, or to figure out how to fix.

So, again, how could a board in excellent condition, with no visible flaws, and no other indications of anything else being wrong, even software wise, develop the issue in the first place?

One POSSIBLE answer: it was flawed to begin with.

Okay...enough of the rant!

Sorry guys, but I just blew $108! (They want $175 + parts to fix the rom board alone!)

If anyone has any suggestions on what could be causing the issue, or have seen it yourself, any help would be greatly appreciated!

Happy New Year KLOV!
 
I have the same issue here.... except I only get IC 17 failing.....

If you look at the test screen, you will see that there are TWO lots of IC17 and IC18 in the tests.....

I have a feeling that in the Memory test Screen, the top test is the roms (You can see It tests IC's 17>20) I think !!

..and the bottom test is the rams ( I think).... IC13 through to IC18 + IC 94 (From the Manual)

What are you seeing ? - Mine fails at the far bottom right IC17 - The Tests above (eg 17>20 are OK)

You MAY well be correct thinking its flawed !!

Thanks, Colin
 
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I believe the volume pots need to be replaced because when I calibrate, it's almost impossible to get the numbers to stop jittering/jumping. Then, while playing, the sight jitters around the target I'm shooting at. Unless that's normal for the game to make it harder to hit the target, but it seems like it's a pot issue.

Damn...all this pot talk! :)

Just clean them. This should help. They are linear tapered pots.

http://forums.arcade-museum.com/showthread.php?t=144880

RJ
 
Yeah, I got the pot worked out. :) I just replaced the thing. Works great now!

My failing roms are the bottom ones on the test screen (IC 17, 18).

Interesting what you pointed out about the 2 sets of ICs ColinD.

When I contacted Don at Sega, he assumed I meant ICs 17 and 18 on the top rom board. He's the expert, not me, so I assumed he was right. It makes sense though since there are only a few chips on the top rom board, and only a few chips being tested on the lower half of the memory test screen. But, I'm going to get a hold of him and talk to him about it.

What I want to know is what are these 2 roms used for? I have played all the way through the game on every difficult level without "noticing" anything wrong.
 
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I looked into this yesterday for ColinD, the IC17/18 at the bottom of the SWT test are the two rams on the cpu board (one below the rom board) I had a Sega rally 2 here reporting IC17 as bad at the bottom of the test, however the game runs perfectly, replaced IC17 and the error is gone. What ive seen before is that you may only see certain rams/IC's effect certain games that run on model 3 S2 hardware.

Hope this helps!
 
I looked into this yesterday for ColinD, the IC17/18 at the bottom of the SWT test are the two rams on the cpu board (one below the rom board) I had a Sega rally 2 here reporting IC17 as bad at the bottom of the test, however the game runs perfectly, replaced IC17 and the error is gone. What ive seen before is that you may only see certain rams/IC's effect certain games that run on model 3 S2 hardware.

Hope this helps!

Thanks! That confirms my suspicions and the test I just did. I'm now 1000000% convinced that the guy at Sega made a mistake, and told me to replace the wrong 2 chips. He told me that they were the ones in sockets IC 17 and 18 on the top Rom board. But, I've just PROVEN he is wrong.

Remember, my game is working and playing fine with the errors. So, what I did was pull the 2 ICs I replaced from the top board (17 and 18). Since the test was coming back that these were bad anyway, then with them gone/pulled out, my game should function the same, right? But, when I pulled them, my game doesn't even boot up, or have any sound, screen image, etc. Nothing comes on but the power and fans in the cabinet.

Well, that HAS to mean that those 2 ICs on the top board were functioning all along, and that the errors for ICs 17 and 18 at the BOTTOM of the test screen in my memory test are IN FACT referring to 2 different ICs on one of the other 2 boards!

This is all true as long as a game with bad rom errors functions the same as if the roms are missing.

Any comments?
 
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