Arcade Collecting > Miscellaneous Arcade Talk
How to start finding board and monitor problems?
SirPeale:
Isolation transformer. I think it may also act as a power supply as well, of a sort.
APFelon:
That isn't the power supply. Don't start there, it is not likely the cause of your problems. Check page 48 (actual page 45, 48 on the PDF file) of the manual I referenced, that it the power supply board.
Double check that back door switch to see if it functioning correctly. It may have gone bad (it IS nearly 25 years old) and be the cause of the primary problem.
Check to see if you are getting the 110vac everywhere it needs to be. Check from the cord on up (where it hooks in to the filter / "silver thingy" and work your way back. You could even have an internal break in the cord.
Keep us updated, I'd like to see how this progresses.
APf
unclet:
Let me state again, that I have no experience with trying to test stuff with a multimeter and no real experience withj electrical stuff (other than hanging fans and wiring up my other Mame cabs).
APFelon: That being said ..... I really do not understand what "see if you are getting the 110vac everywhere it needs to be" .... since I have no idea where it "needs" to be ;D Where would I place the multimeter probes to test for 110vac going into the filter/"silver thing" on the transformer board? Perhaps one probe goes on one wire and the other probe on some other wire?
Finding page 45 or 48 is impossible since the link you provide me with (http://www.arcadedocs.com/vidmanuals/S/SpaceEncounters.pdf) only has 42 pages. Are you referring to the document at this link or some other link?
As for the backdoor switch, would you recommend I simply connect the wires together to simulate the switch always being closed, thus eliminating the use of the switch at all?
If I have some time tonight, I will play around with it later and see what I can find.
Peale: Are you saying that the thing mounted on the bottom of my cabinet is called an isolation transfornmer or are you referring to something else?
APFelon:
--- Quote from: unclet on March 06, 2005, 06:44:05 pm ---Let me state again, that I have no experience with trying to test stuff with a multimeter and no real experience withj electrical stuff (other than hanging fans and wiring up my other Mame cabs).
APFelon: That being said ..... I really do not understand what "see if you are getting the 110vac everywhere it needs to be" .... since I have no idea where it "needs" to be ;D Where would I place the multimeter probes to test for 110vac going into the filter/"silver thing" on the transformer board? Perhaps one probe goes on one wire and the other probe on some other wire?
--- End quote ---
Well, just check where you *know* line voltage is supposed to be-- the monitor, the marquee lights, the filter, etc.. Set the multimeter to "VAC", touch the black probe to a known ground (perhaps one of the green FG wires that are probably hooked to everything) and test from there. You should get 110-120 VAC "everywhere it needs to be". :)
Then check the leads to the power supply board (my apologies for the earlier mistake on the page number) it is actually on page 25 of a hardcopy or 26 of the PDF. Where I got those other page numbers I don't know. :-[ Anyway, if you get 110 to the power supply, check the voltage coming from the supply itself. It looks as though the power supply has voltage regulation pots on it, so if you see any funny voltages, adjust those pots until you get the juice you need. (a poorly adjusted PS could be the cause of "junk on the screen" problem the seller told you about)
--- Quote ---As for the backdoor switch, would you recommend I simply connect the wires together to simulate the switch always being closed, thus eliminating the use of the switch at all?
--- End quote ---
You sure can, and I have seen it done a lot. If you are getting ZERO power to anywhere on the cab (aside from the filter), I'd bet money this is where the problem lies.
That big block with all of the wires coming out of it is the isolation transformer. I have yet to see one die of "natural causes".
APf
--- Quote ---
--- End quote ---
unclet:
I understand what you mean to test for 110Vac, but as to where to place the probes, I have not a clue. I am not sure where 110Vac should be going into a monitor or going into the filter. Actually, not sure what you mean by "leads into the power supply board" either. There is a molex connector with many wires going into the power supply board ..... do your mean test a couple of these wires or something different?
I do see the 3 Pots on my Power Supply board. The diagram in the PDF of the power supply board shows the Pots are -5V, +12V and +5V. Should I check for these positive and negative values, or should they all have 110vac? Basically, what is the difference between V an vac? Not real sure where to put the probe on the wires leading into the pots either ..... I will try to play around with it.
I just got back in from the garage trying to probe around loking for 110vac (before reading your latest reply), and I felt like a real idiot and having no idea where to put the probes. I gave up. I will retry again and see if I feel any smarter ...... :)
I feel bad about this, but I am also laughing a bit as well at how inept I am at even understanding what most of you consider trivial stuff. Hopefully you will continue to hang in there with me before going completely mad..... :P
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