G05 in Asteroids keeps blowing F6

action53

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I turned it on to play a game last night and after one game the screen slowly started going dim, no neck glow and playing blind, checked and F6 was blown. Replaced it played barely one game and did the same thing again. I didn't have time to check into it last night but is there anything in particular I should check into when I get home? I've already reflowed the headers on the deflection board but that's it.
 
Check for a smashed coin door light bulb. The 6.3v AC supplied through F6 runs the heater in the CRT (neck glow) and the coin door lights.
 
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F6 is for the 6.3VAC, which does feed the coin door lights, but it is also the supply for the CRT heater filament, which is probably why you have no neck glow.

You can check for bad connections or solder joints in the heater circuit (which I believe goes through the deflection board). You might also have an issue with the tube maybe? I can't say I've seen this exact issue before, but you should also try testing the heater filament with a DMM, and make sure it didn't blow, or short to something else in the tube.

You should be able to measure continuity between the two pins (which I think are pins 7 and 10 on P500, but check the schematics.) You should test them on the tube itself, but I don't know which pins they are off the top of my head.
 
After a lot of reading posts, schematics and guides stressing out over not wanting to melt my last 3a slow blow fuse I unplugged the coin door and its been on an hour working fine. Once my fuses come in I'll probe around and try to find the short.
 
After a lot of reading posts, schematics and guides stressing out over not wanting to melt my last 3a slow blow fuse I unplugged the coin door and its been on an hour working fine. Once my fuses come in I'll probe around and try to find the short.


Ok, that's good news.

If that's the case, just look to see if any of the wires for the lights has come loose, and is just shorting against something.
 
Ok, that's good news.

If that's the case, just look to see if any of the wires for the lights has come loose, and is just shorting against something.

Nothing looks obviously worn or broken but it is kind of a mess in there, it's probably one of the many loose wires with nowhere to go
 

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