latest addition: Midway Sea Wolf

gwarble

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hey all
picked up a Sea Wolf today (thanks Steve)

don't know much about this thing, its pretty early for my collection, but i'm stoked. its in decent shape, and complete... but not super nice

hopefully i can remove the brown haze covering most of the sides/front... and its a little funky (mildewy or something) but i'll clean out the inside tomorrow

PO said garbage on the screen... and suspected the power supply (which in the start of my reading today is pretty normal)... hopefully i can fix the parts i have as i suspect they are hard to find... the main board is not in great shape, corroded, dirty, some bad solder spots... but i'm keeping my fingers crossed until i can clean up the inside a little, reconnect everything, and check my voltages...

gwarble
 

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more pics...
 

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Congrats, that is a very cool and fun game. It holds up well today and i am sure you will enjoy playing it. Post a video, not too many on YouTube...
 
Nice pickup, great game! I would suggest as a first order of business that you replace the original connectors with regular edge connectors (looping the signal to both sides where ever the boards pick up the signal on both sides). The originals are absolute junk and very well could be the cause of the problem. Even if they aren't, they'll likely cause you trouble at some point.
 
Excellent game. Definitely a "just one more" type game, which can be attributed to its timed, relatively short game play. I love mine, and my kids love it but want to be tall enough to play it without having to use a stool.

DSC00838.jpg
 
pulled the brick from the bottom of the cabinet and scrubbed out a layer of something fierce... don't really want to know what pissed or something, could be oils or something from the air, i don't know but it stinks... luckily no shit

i usually test and try to repair games when i first get them, but this was just too yucky to work in... so i pulled the brick and some of the wiring, and i think i'll probably paint the inside of the bottom of the cab, try to seal some of the smell in/out or something... i'd rather test the game/monitor before pulling the monitor and cleaning/painting up any higher... but i might depending how the smell does...

luckily no oily film in the top part of the cabinet, but the smell is there too...

next i'll make a new board for the isolation transformer/fuse block (which is busted so a new one) as i'm sure its as smelly as the cab... un-zip the wires that were laying on the floor board and clean them and re-ziptie the harness together...

- gwarble

edit: can't attach pics now i guess
 
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Awesome addition, congrats. The old midway games need the +5v to be OVER 5v. 4.89 won't do it, you'll get garbage on the screen. Also, the Rom chips have a tendancy to pop out when the game has been running a while and is hot. I actually had to tape one in to keep it from popping out and causing problems if you can believe that.
 
thanks...

i haven't quite got that far yet, but when i do i'll keep that in mind... i separated the two boards, daughter board is pretty clean except corrosion on the edge connector, mother board has some trouble spots, corrosion, edge connector grooves from connectors, etc... i'll do minimal cleanup of the visual stuff, finish cleaning up the bottom of the cab and fix the power brick, possibly change the edge connectors on the harness, and try to fire this thing up... oh and power board visually looks very nice...

the brown haze over the outside (doesnt smell at least, but could be the same thing that dirtied up the inside) doesn't come off the artwork easily unfortunately... and some missing sections means i may get a little paint matched and patch up what i can... longer term thinking...
 
made a little progress...

got the inside painted, new xformer block and fuse block, boards back in and wired up...

first power up, saw a spark on the monitor chassis, flicked back off...
found nothing, fired it back up, and got blank raster on the monitor (phew), a faint sonar sound and speaker hiss controllable by volume pots... checked and +12 and -5 are good, but +5 is missing... bummer...

i finish tidying up the wiring, retry it and now it has +5.08! got garbage on the screen!

so i'm getting close, gotta find the intermittent connection that stopped my +5... and then i guess learn how this reset circuit on the power supply works and see how to test it, as the first garbage screen looks very similar to whats here:
http://www.pinrepair.com/video/seawolf.htm

hope to figure this out...
gwarble
 

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also it appears i have a space invaders or similar power supply installed (3 pots instead of 1)

and got different garbage
 

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Congrats on the new project – always great to find other SeaWolf fans out there!

Many thanks for the updates – as I'm in the same boat trying to get mine up-and-running (http://forums.arcade-museum.com/showthread.php?t=261146) and hoping I can pick up some tips.

-Have to agree with the others on replacing the connectors – especially if you're seeing some flakey voltage.

As for the reset - Is there a way to manually kick-off the reset (ex. Momentary switch hooked up to ???) – to see if the delay reset circuit is bad?
 
Reseat the daughtboard to mainboard, reseat (and clean the legs of) the roms and the CPU. Make sure all 4 screws of that blue CPU socket are snug when you put it back in (you have to loosen them to remove the CPU.)
 
Thanks...
I cleaned and reseated the daughter board, but couldn't figure out the blue chip holder, i'll check that
 
Bummer, i pulled main boards again, recleaned the edge interconnect and found some bad pins on the edge connector... tweaked a couple and now no garbage on screen...

Also has a 2 rom upgrade, one new socket in H but the old socket in G which is very loose... anyone know if an empty G socket will give blank screen or garbage?

Otherwise i'll have to start looking for a pcb-mounted 72-pin edge connector...
 
Ok i'm learning as i go on this system, i may start a repair thread... but apparently no roms in should give me vertical white bars indicating RAM errors... I did get those bars a couple times when it was coming up before i messed with the interconnect and cpu seating... When they did come up there were some flickering spots, so i probably have ram problems too

So i'm going to order the new edge connector for the main pcb (and wiring harness), change the loose rom socket, and see where i get (hopefully at least back to the garbage or vertical bars)

I checked the reset circuit, and (no probe, just multimeter) saw no +5 on motherboard pin10 at power on... but interestingly i did see a peak and petering out HI on shutdown, which i read somewhere is normal... so if i can fix the interconnect problem and get video signal back, i should be able to try tying pin10 to +5 momentarily to fake the reset circuit
 
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