The invaders machine by zaccaria, no sound

Djkus

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Hi, I have recenetly purchased "the invaders" arcade machine which is in good condition and works fine right now, but there is no sound at all..

when i first got it there was sound occasionally, usually until second level (phase), but now there is none at all.

also, when i first got it the graphics were very glitchy and wouldnt always work... since bringing it into the my warm house it seems to be ok, sometimes the odd glitch..

it was in an old damp warehouse for about 10 years or more i think.

does anyone have any idea how i can get the sound working again? i think these are preety rare machines, perhaps more rare than the original official space invaders?

look forward to hearing from you all, paul
 
clean the insides good,clean the edge connections on the boards and the edge connector of the harness that connects to the boards.just do some general cleaning.you would be suprised what dirty boards play like in compartison to clean ones.

it pays to left socketed chips and clean the legs and reseat them again.
:)
 
Hi, I removed the board from the machine and it looks preety clean, not any visible corrosion on it, from what i can tell the speaker plugs directly into the board, i was thinking there was an external board amp, but now realise its all on the game board. do you think its the game sound chips or perhaps the amp stage? i wish i had my osciliscope from my last job, would be so easy to fault find this, but ive only a multimeter :/
 
sound fixed!

i removed the board, resoldered some possible dry joints on it, put it back in, still no sound... began touching the wires going to speaker... when i touched wire on speaker sound came a little...
i removed speaker, turns out there was dry solder joint from speaker wires to the solder point that the game wires were soldered onto.
always the similest thing in the end isnt it!

so its all working now but i notice that when i shoot an invader i just get a beep, not an explosion but apart from that all the sounds are correct.. not sure whats up with that paticular sound not being right.. any idea? dry joint probably somewhere.. it is from 1978..
 
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