SC3000H blank screen constant tone?

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SC3000H blank screen constant tone?

Postby matsondawson on Sat Mar 09, 2013 8:33 pm

Hi guys,

I bought the boxed sc3000h on trade me, but when I plug it in it get a blank screen with constant tone?
I've tried plugging a cart in which makes no difference.

Any ideas?
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Re: SC3000H blank screen constant tone?

Postby matsondawson on Sat Mar 09, 2013 8:46 pm

Just tried cutting my finger open and a new Z80, neither of those worked.
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Re: SC3000H blank screen constant tone?

Postby matsondawson on Sat Mar 09, 2013 8:54 pm

Oops, don't panic, just a dodgy cartridge port.
I was expecting there to be some sort of rom on it too already, but apparently blank screens were the rage in japan.
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Re: SC3000H blank screen constant tone?

Postby Carcenomy on Sat Mar 09, 2013 10:26 pm

matsondawson wrote:Oops, don't panic, just a dodgy cartridge port.
I was expecting there to be some sort of rom on it too already, but apparently blank screens were the rage in japan.

Yep - the cartridge ports are quite fickle on them. Mine often give the blank screen and tone, so you turn it off and give the cart a jiggle, away she goes again.
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Re: SC3000H blank screen constant tone?

Postby mrad01 on Sun Mar 10, 2013 8:57 am

Totally normal. Sometimes they need a very thorough clean of the cart connector. I did this by folding some paper around a thin piece of cardboard and pushing it in & out of the cart connector. Move the paper around from time to time as it get black stuff on it.

Repeat until no black marks appear on the paper.

Then the connector is clean and it'll work.
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Re: SC3000H blank screen constant tone?

Postby honestbob on Sun Mar 10, 2013 7:50 pm

Totally normal. Sometimes they need a very thorough clean of the cart connector. I did this by folding some paper around a thin piece of cardboard and pushing it in & out of the cart connector. Move the paper around from time to time as it get black stuff on it.


Yes, totally agree. Very common for dirty cart slots to cause a problem. And the SC-3000 won't do anything unless it has a cartridge inserted as there is no bios on-board.

Edit - the black screen and constant tone is a good thing for a SC-3000. It means that most of the system is probably working :) If the screen goes a nice solid black then the video circuitry is probably outputting a reasonable signal and the medium tone means that the sound generator is outputting its default noise from a cold boot. You are then relying on a good connection to the cart to provide some code for the Z80 to execute. If that doesn't happen, you first check the cart contacts, clean the cart slot, try multiple games cartridges to look for different behaviour, then start inserting Basic IIIA and IIIB carts to see if you get some error beeps or not to isolate obvious memory / VRAM errors.

I haven't tried using paper to clean the slot before. I think this is my favourite video on how to clean a cart slot. This is for a Famicon, but the process is basically the same for the SC-3000.

http://www.youtube.com/watch?v=bWg2k736KZ4

My usual recommendation is something like a handkerchief around a thin piece of card rather than paper. I found that easier to handle than a T-Shirt as used in the video.

Just one comment. Be careful when cleaning the cart slot. If you bend a pin it is very hard to straighten it out again and you may be looking for a replacement edge connector. The main thing is to make sure that your cardboard + cloth is not too thick (it should be approximately the same thickness as a PCB), or too fluffy (that is why a handkerchief is good). And don't use too much water on the cloth - just slightly damp. And let it dry out afterwards.
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Re: SC3000H blank screen constant tone?

Postby natshaw on Fri Mar 15, 2013 8:42 pm

I blasted the hell out of mine with contact cleaner, worked a treat. No need to wait for it to dry then, really good. Agree still need something to physically dislodge the heavy stuff, much easier if you can remove the PCB.
SC-3000H, SC-3000H, Amiga 500. Hobbyist electronics and programming.
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