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Title: Revenge of doh board help Post by: blackjack851 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
Title: Re: Revenge of doh board help Post by: channelmaniac 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. Title: Re: Revenge of doh board help Post by: blackjack851 on July 31, 2013, 12:44:48 AM Thankyou much, I'm just learning ..ill be checking those tonight and see
Title: Re: Revenge of doh board help Post by: channelmaniac 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. :) Raymond Title: Re: Revenge of doh board help Post by: blackjack851 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
Title: Re: Revenge of doh board help Post by: channelmaniac 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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