Glitchy Gunbird 2

PCB problems and fixes
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Stompp
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Glitchy Gunbird 2

Postby Stompp » February 26th, 2017, 6:14 pm

I have a Gunbird 2 PCB that's been working ok, but when I started it today the backgrounds looked strange in both attract mode and in stage 1-5. Stages 1-1 to 1-4 seems ok though.

Anyone got any idea what this might depend on? 5 V line is ok and I've tried pressing the IC's on the board but no success so far.

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Asayuki
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Re: Glitchy Gunbird 2

Postby Asayuki » February 26th, 2017, 8:19 pm

From the look of it, it could be loose joints, but it could also be RAM, one EPROM or maybe some TTL.
EDIT: hard to say without making some measurement.
My 15kHz cabinet Peplos will never power up, with any item, and I am quite proud of that.
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Stompp
Posts: 883
Joined: July 10th, 2012, 10:58 am
eBay: uridium
Initials: DAD
Location: Stockholm, Sweden
Contact:

Re: Glitchy Gunbird 2

Postby Stompp » February 26th, 2017, 8:57 pm

Asayuki wrote:From the look of it, it could be loose joints, but it could also be RAM, one EPROM or maybe some TTL.
EDIT: hard to say without making some measurement.

Thanks. I'm not in any way experienced when it comes to troubleshooting PCB's but I'm eager to learn :awe: Only tools I've got are a multimeter and a TOPS burner. I guess I should invest in a logic probe at least and then scour the Intertubes for some info on how to tackle this. It's gonna be a looong night :shifty:

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