Arcade Collecting > Miscellaneous Arcade Talk
Astro Blaster Z-80 Arcade Machine Help
D_Zoot:
--- Quote from: bluemanop on February 14, 2005, 07:50:28 pm ---Here is a good question, do you know how many amps these boards greatly pull from the 5volt power supplies that power them?
--- End quote ---
Nope, I don't know. I'm not personally familiar with that specific board.
Games of that vintage usually ran dandy with a 15 amp supply. Given that supplies were usually spec'd with some overhead, I'd say the total current draw on the +5 line should be well under 15 amps.
About the O-scope. If you are interested in getting your "feet wet" again with electronics and logic circuits, but are not sure about spending the dough on a scope, consider a logic probe. Logic probes can be had for $20 and will get you a long way in basic board troubleshooting. Most of the boards I work on I could have diagnosed with a logic probe alone.
Looking forward to hearing how you make out!
D
bluemanop:
Any recommendations on the logic probes? I have been looking at all my choices on eBay ;D for the last week or so.
bluemanop:
Well it looks like UPS managed to be a little slack. Even though I ordered the Z80 processor on Sunday, the part was shipped on Monday but it won't get here till this up coming Monday.
I did get a chance to get to the machine today and test the board with a re-seated IC chips. The machine powered up like it normally did to a blue screen. No change.
I did check the power supply and I did register about 5.1 to 5.2 volts from the power supply to the main board so I think there are no issues there. I am still thinking the Z-80 processor is dead but that is just a guess at best. We will see come Monday.
bluemanop:
Well I am at a loss as to what to do next. I tried pulling out that Z80 processor and replacing it with another but it was a no go.
I tried pulling out boards like the sound card and powering up the unit and I still get nothing but a blue screen.
I am open for any suggestions at this point.
D_Zoot:
Sounds like it's time for some serious board-level troubleshooting.. Scope or logic probe time....
If you wanted to send it to me, I could have a look at it.. I'm very backed up, (7 pins waiting for overhauls and 8 vids with problems). If you were in no rush whatsoever, I could have a look, but it could be weeks before I could get it on the bench. Otherwise, I think it might be good if you can find somebody local to you to help you troubleshoot it.
As a last resort, you could exchange it with eldoradogames.com They would swap your's with a rebuilt one for $119. I've used them in the past and had good luck with the boards I've bought there. They aren't very good about email, so it's best to call them if you needed to get in touch with them.
D
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