Author Topic: Monster Bash  (Read 763 times)

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Offline robm

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Re: Monster Bash
« on: December 22, 2011, 10:09:50 AM »
Been a bit of a delay getting back to writing this up.....due to having too much fun playing the machine:):):)

Firstly, putting the main decals on weren't too hard - i had some old coolite (the stuff vege boxes are made of) and cut it to the size of the coin door hole - jammed this in so it sat flush, and put the front decal on.

Then the main decals went on - one tip is to start at the back end and work forwards, we did one the other way and ended up with a couple of bubbles near the end, since the box was getting bigger.  That said - pricking the bubbles with a pin and flattening them out does wonders - you can't even tell unless you had a magnifying glass.

So then it was putting the playfield back in, coin door and all the other bits ready to fire up and......nothing, the startup dong and no flashing middle LED on the CPU board.

The CPU had some previous acid damage that hadn't been repaired wonderfully.  I gave Ken (Skybeaux) a call to see if i could try putting a WPC-S board in, rather than a WPC-95, but forgot the the WPC95 has the flipper controls on the CPU.  Anyway, threw the ROM,RAM, and Security chip in a WPC-S board, with only the power connector, and the machine at least booted - so i new those chips were fine.

Went along and checked continuity on each socket of the above chips - found one leg that was a bit dicey, gave it a good clean.  The only corrosion was around a 74LS14 chip, and a few resistors around it.  Luckily i had 2 spares (i always buy extras when getting stuff like that), Pulled the old one out and spent quite a bit of time cleaning all the area with vinegar/water, alcohol, and some very fine emery paper, put a socket and a new chip in, the machine fired up perfectly.  I was pretty relieved as even though i knew Ken could have fixed it, i didn't want to wait another week or two for posting boards away etc.

Had a few minor issues including

One rubber i forgot to put on behind Dracula - so the ball got stuck

Forgot to plug Dracular motor wires in

A wire had come off the mummy coil

A few minor switch adjustments

GI short somewhere - the top right string is blowing a fuse - there is not continuity to ground - so i'm assuming its a shorted bulb or socket? Anyway, that's tommorrow or the day after's job.

I must admit i forgot how fun this game is, and it was extremely rewarding to play a machine where everything is in really really good shape, without any dust or grime and new balls flying round a glassy surface.

Anyway, enough drivel, enjoy some pics






Used a Flintstones 'Rock Me' button instead of the standard one