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Author Topic: Revenge of doh board help  (Read 4297 times)
blackjack851
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« on: July 30, 2013, 09:28:19 AM »
My Revenge of DOH board had a problem with the red blocks.They look washed or partially disappearing.Only happens with red blocks..Please help

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« Last Edit: July 30, 2013, 10:02:17 AM by blackjack851 » Logged
channelmaniac
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« Reply #1 on: July 31, 2013, 12:32:27 AM »
Check R22 through R25 and the 74LS273 next to it.

The red output is from the PROM A75-07 to the LS273 to the resistors then through L6 and across C5 before hitting the edge connector.
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blackjack851
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« Reply #2 on: July 31, 2013, 12:44:48 AM »
Thankyou much, I'm just learning ..ill be checking those tonight and see
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channelmaniac
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« Reply #3 on: July 31, 2013, 01:34:28 AM »
You're welcome!

I just happened to have one on the bench tonight that I'm scrapping so I took a look for you. I needed the PC030CM hybrid module off of it so that a Bubble Bobble would live again. Smiley

Raymond
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blackjack851
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« Reply #4 on: July 31, 2013, 02:06:30 AM »
My question now is how do I test these chips ? All I have is a nice fluke multimeter
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channelmaniac
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« Reply #5 on: July 31, 2013, 08:51:32 PM »
This is where you test the resistors with the meter and just replace the chips since you don't have a logic probe or an oscilloscope to check them with.
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I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com
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