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MFoolsRun

Colecovision Pulls to the Right

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Hi,

I scored a Colecovision at a tag-sale today, got it home, powered it on, and it works! But in all games right-direction behaves as though it's held down; the character moves to the right constantly.

 

I tried both controllers that came with this system, and two controllers that I had from a DOA Coleco I'd gotten last year, all with the same result. I haven't yet tried whether the problem exists for player2.

 

So my question is this: what should I try? How might I fix this issue?

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Colecos are very sensitive to static charge. I believe you have a fried controller logic chip. It's not hard to replace, if memory serves.

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likely just a worn sticky controller, If you are up to it unplug and try each controller seperate and see if it's just one of them...........

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I don't know the CV, but I think the controllers work similar to most other old systems like the Atari.

There aren't many things it could be. One of the pins controls right movement, it should normally be 5v and the controller pulls it to ground when moving right.

It's apparently not the controllers. Just to confirm you could also check the pin with a multimeter without any controller plugged into it. If it's +5v yet it acts like you're going right, then the controller IC must be fried.

If it's 0v, then maybe it's still the IC or else something else is pulling it down. Check anything connected to that trace on the board.

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Heh, multimeter work is a little beyond my usual "clean and pray" skillset for console repair. Besides, it turns out it pulls right even when there's no controller plugged in, so I think you're right, something's fried. But thanks for the info, everyone!

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You do a visual inspection of the pins, just to make sure none are bent (if you haven't already)....

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The problem is definately the Texas Instruments SN74LS541 Octal Buffer(s) at U18 (player 2) and/or U19 (player 1). It/They would need to be replaced, and are still readily available if you have the ability to solder.

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The problem is definately the Texas Instruments SN74LS541 Octal Buffer(s) at U18 (player 2) and/or U19 (player 1). It/They would need to be replaced, and are still readily available if you have the ability to solder.

 

Jumping into this thread with a similar problem: controller port one automatically fires one shot or jumps once, then the fire buttons no longer work. Would this be the same as the pulling to the right problem with the same solution?

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The problem is definately the Texas Instruments SN74LS541 Octal Buffer(s) at U18 (player 2) and/or U19 (player 1). It/They would need to be replaced, and are still readily available if you have the ability to solder.

 

Jumping into this thread with a similar problem: controller port one automatically fires one shot or jumps once, then the fire buttons no longer work. Would this be the same as the pulling to the right problem with the same solution?

 

Yep, basically the same problem, with the same solution.

5-11under

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