Recent content by char1ie

Thanks all, I just rebuilt the power supply a few weeks ago with a Rob Roberts kit. I'll start this weekend. Charlie

Forgot to say thanks all for your suggestions so far. I would like to narrow it down as much as possible before I get the iron out. Charlie

I took some video last night. Excuse the music in the background. You can see the video issue - screen is blue/grey where it should be black. Later it fixes itself - it takes a few minutes. At first: A few miutes later: Is this a monitor issue, board issue or power issue? And the machine...

When I turn on my Robotron cocktail the monitor is heavily blue and all the colours are wrong - game is fine and playable. Within a minute or two it flickers and fixes itself. Where should I start looking? Monitor cap replacement? Thanks, Charlie

Are you using the cheat? Running up the score, ending with the right digits, next game you get to start on any level? It was a big deal in 1984 if you knew how to do this. And it's something else about the game that makes it a cult classic. Charlie

Quick update to say that I had a couple of Ram 16 errors so replaced the IC and the game seems to be fine now, running without resetting for some time. Thanks all. Charlie

Paypal is an amazing service. The claim process can work in both ways. I have had three or four successful claims against people recently when stuff that should have worked didn't work. And I have lost out once when a claim was disputed that shouldn't have been disputed. It happens. Before...

Some sensible advice: First, follow the instructions that Paypal offers and give them as much detail as you can on the claim. They don't always find in favour of the buyer. Make sure you provide the right info and be honest. If the camera kit she/you sold was good then you'll be fine. If it...

I have connectors - from Bob Roberts - and will re-do these next. Thanks EVB - I'll start with this. Charlie

Can we have some examples? Charlie

That's it! It was a mouse farting in the next room. I'm getting the traps out. And I'll check the 5v supply. Charlie

Aaargh! Just had a good game. Around 800k and the machine reset, displayed the coloured carpet, told me it was operational and started up again. I have done the caps and rectifiers on the power supply. What else should I do to stop this happening? I'll get the voltmeter out and start checking...

Success! I swapped the connections on the big capacitor, replaced the fuse at F4 and the game lives. Charlie

OK, I think I may have answered my own question with a google images search: See the + symbols? They DO NOT mean that's the positive terminal do they? No. Duh! I have installed my 18000uf cap round the wrong way. What have I blown? Can I install it the right way and expect it to work or will...

Thanks Ken. 4700uf cap is installed correctly. Whats the SCR? I'm showing my inexperience here: On the 18000uf capacitor I got from Bob Roberts it has the big stripe down one side which on other capacitors indicates the negative terminal. It has + markers alongside it so I assumed it was the...