Just acquired a Sega / Gremlin Astro Fighter... Need some help with power

mschwartz01

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Just acquired a Sega / Gremlin Astro Fighter... Need some help with power

I am hoping a pro here can help... Apparently the power cord has been cut off of this machine.

This machine seems different from what I am used to...


Here is where the wires are cut... Bottom of the box. It looks like there is some type of black fuse holder on the bottom left of the box. What would be the proper way to wire this up so I can test the game?

14jwaxy.jpg


Thanks to all who can provide info!
 
Not sure if it helps, but the 3 wires coming out of the bottom of the box are:

Solid Black
Green
Black with white line

Anyone have any ideas on the proper way to wire this? I'm sure I'll need to pick up some sort of inline fuse holder to attach to on the left?
 
If you follow the wires through the box, one goes to brown, one goes to blue and another to green.

"Sky" colors and "earth" colors go together. So if you splice on a power cord, the white wire goes to blue, and the black wire goes to brown, and the ground wire (goes to grounding prong on plug) goes to green.

The box already has a fuse holder built in but looks like you may be missing the cap? If so, you'll need to either find a cap or put another fuse holder inline there.
 
Successfully got power to the machine... Unfortunately there seems to be so much wrong with it... No monitor reaction at all... Get a feedback sound from the speaker... No playing blind... No Anything... Looks like this may be just a cabinet project....
 
Start by checking the voltages at the input and output of the power supply. See if that's working. You don't get anything on the screen, but can you hear the monitor power up? Does the neck glow?

All of your problems are fixable. But divide and conquer, it's likely that you have multiple problems. Start with the main power supply, make sure you are getting good power to the board. Check to make sure you're getting power to the monitor, etc. What kind of monitor is it?

-Ian
 
I haven't got to check any voltages, so that will be my first step. The monitor didn't make any sounds or glow, but I haven't comfirmed its getting the power it needs... I'll report back soon.
 
I have to admit... I'm in way over my head on this... I was looking around the back of the game last night and I've come to realize: I don't know how to properly use the multimeter, or where to put the contacts to even get the readings... Anyone looking to be a mentor and take me under their wing? I can post a lot of pictures and I take direction really well!
 
OK - to identify parts - upper left, box with the power cord running in to it - line filter. Lower left, the box with the capacitors and stuff, power supply. Middle bottom, black block - monitor isolation transformer.

You have a Electrohome G07 monitor - one of the most common and easiest to service monitors ever made. Also, IMHO, nearly the best raster arcade monitor ever made in terms of reliability and picture quality. But... it will *probably* need service. Check the fuses on the monitor's board, I'll bet the B+ fuse is blown. If it is, you need a flyback and a HOT, might as well do caps while you've got it apart, it'll probably need it.

The power supply is indeed a simple linear supply. There is very little to it, it'll be easy to troubleshoot. Start by checking the +5 and +12v lines.

-Ian
 
That is great info! Thank you so much! Remember though, I'm new at this and I'm still not 100% sure where to put the probes on the multimeter in order to get those readings... Its pretty straight forward on the switching power supply (everything is labeled nicely)...

Care to guide me through this one?

I really appreciate the help!
 
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