Polybius

Friends, I hope someone can help me out here. I have a Hantarex MTC9000 monitor that is giving me fits. I have replaced the flyback, hot, done a full cap kit and followed instructions on this page: http://www.markscotford.com/DIYHan.html and I stiill don't have high voltage. I am at a loss here. Any assistance would be greatly appreciate. It's a 25" BTW.

Thanks.

Makes sense. In my defense I was primarily cleaning off old solder that was already on there. I'll rebuild that connector soon. Thanks.

No no no no no.  Never put solder on the edge connector.

Enlighten me. Why not?

Good news I got it working again. I did a few things, but I think the real cultprits were the edge connections on the smaller pcb. They were full of crud. I cleaned them off and then used solder to make them nice and clean. I also reseated a few chips. I resoldered the pins on the interboard connectors and checked continuity between boards to ensure all was well. Finally I noticed some A/C in the D/C line so I replace the big blue capacitor in the power supply. I suspect that is what was causing instability (wiggle) in the graphics on the screen. As you can see from the video below it's playing great and looks great. Crisis Averted!

http://youtu.be/Ng3P2i_x4u8

Hello Friends,

I am having some video issues during gameplay on my Tempest. Text looks fine, but when I actually begin a game the spaceship is jumping all over the screen and the grids don't even show up. I uploaded a video of my Tempest to YouTube so you can see what it's doing.

Here is the video:

https://www.youtube.com/watch?v=rLHllGxESig

Your assistance is greatly appreciated. Thanks.

Well I got a new board. Guy on KLOV does a swap. Works great. Got it cleaned up. The sound was still out so I inspected the AR board   I replaced the audio amps and found a bad trace from one of the bigger caps. Jumpered that and sound came right up. Looks and sounds great.

Well we are rearranging the arcade so once I get that all done I'll take some video

Ok so I replaced the LS161 and  the q1 q2 and q3 transistors. No change. I was able to borrow a working board from a friend and popped it in the cab. Game worked but with no sound. At least I know the monitor works and it's definitely a board issue. Well back to the drawing board for me.

Do you mean a walkthrough video of the arcade?

I'm currently working on a Battlezone, Frogger and that Asteroids Deluxe. I actually have to update the site with a Burgertime fix I did recently.

Hello everyone! My name is Les and I am fairly new to this hobby. I have a few machines and am having a great time fixing and playing them. My buddy and I set up a website at www.marylandarcade.com where I will be posting repair logs and other stuff going on in our little arcade. I am having a great time and am looking forward to interacting with all of you.

Les

Things to try. Pull each socketed chip, check the legs for damage, possibly clean the legs with steel wool, GENTLY. The atari custom chips in their games almost always get this black nasty corrosion on them and are very brittle. I've had quite a number of previously working boards come in with broken legs that looked fine in the socket but you pull the chip and one of the legs come off.  Its possible the ram is bad and keeping it from booting up. If you check everything else and it still isn't working well i'll get my schematics out and try to find places of attack.

Thanks for the help I really appreciate it. I actually did this last weekend. I pulled, cleaned and re-socketed all the chips on the board. Put everything back together and nothing has changed. I did however notice that the 74LS161 chip in location D6 looks like it has been repaired. One of the legs looks like it has a copper piece around it. Do you think that could be the problem? I will put in an order for one and replace it anyway just to be safe.

The LED on the game board is lit. It won't coin up and the p1 and p2 are on continuously. I will check the dip settings and change it to free play and report back.

When I got my AD it was similar to yours. My issue was the AR board as well but I found it really needed the correct voltages. I know you've rebuilt it but do make sure all your voltages are set. I think there's also some troubleshooting that can be done depending on what your player lights are doing. Also listen for beeps on start up as well if you haven't already done so. I'm no pro with this stuff, that's about all I got. 

It does not beep at all either.