Westland, MI
you could test the pia with a logic probe. see if you are getting a pulse from the proper leg.
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Looks like they are a tad bit different.
HC is for CMOS
HCT is for TTL
I'm not positive but it might make a difference. now before you replace the chip, I just bought a new magnet board and fixed me right up. obviously you have an issue at the pia but might want to consider getting a new designed board. Got mine off ebay for $59 shipped.
sounds like the magnet board is not working properly. When I was trying to replace things on mine, the solder pads were coming off and I am the first to work on it. was all original. everything buzzed out to where it was supposed to go but after putting it back in, I was blowing fuses on the pbb board and said screw it. bought the new one and has been perfect since.
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