(Topic ID: 242828)

Mr Mrs PacMan F5 Fuse (GI) Showing Continuity?????


By kentmurphy

3 months ago



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  • Latest reply 3 months ago by kentmurphy
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#1 3 months ago

So I'm confident this is a stupid question, but I'm going to ask anyway.

All sounds (music and speech) on my Mr & Mrs PacMan pinball went dead.

I suspected the the Squawk and Talk board so I checked each supply and noticed the -5vdc supply was 0vdc.

The -5vdc supply is feed by the 6.5vac GI supply so I checked the GI fuse at F5 on the power supply in the bottom of the cabinet.

The continuity check with the fuse in the block was good, but when I tested the fuse out of the block, the fuse was bad.

Even with the fuse out of the block I was able to get a positive continuity test when I hit just the F5 fuse clips with my meter.

I'm a bit perplexed. Is this normal?

Thanks!

ps_schematic (resized).png
#4 3 months ago

I did this. I unplugged any connector which had a GI output and then rechecked for continuity. It did not have continuity when those connectors were disconnected. I suspect you should be getting a continuity reading here, but it just seems strange to me.

Quoted from cody_chunn:

Disconnect the GI OUT connectors and recheck across fuse clips. You can get false continuity feedback through the lamps.

#6 3 months ago

bigal56 Thanks Al! Originally I was perplexed, but after reading ur response it makes complete sense. Thanks.

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