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Search: Posts Made By: marty
Forum: Troubleshooting 07-11-2007, 01:24 PM
Replies: 15
Views: 43,103
Posted By marty
Talking protect circuit

Congratulations Paul !!!!!! :) :D :rolleyes: :p
I am Glad that you found the problem and now have a working Board !!! :D :D Now you can get back to writing programs for you machine or watching the...
Forum: Troubleshooting 07-11-2007, 05:06 AM
Replies: 15
Views: 43,103
Posted By marty
Unhappy protect circuit

Hi;
Grant, I would Agree with you that the low for the Switches comes from the Run FF, But, He still shows a SHORT between the two pins. I just checked my board and I don't show ANY short, Both...
Forum: Troubleshooting 07-11-2007, 01:33 AM
Replies: 15
Views: 43,103
Posted By marty
Talking programs for 8080

Hi Paul;
Yes, it does look that way, as though the two are shorted together. I Think what I was refering to --- was if you bent pins 1 and 3 sideways. so that they would NOT connect to anything, and...
Forum: Troubleshooting 07-10-2007, 03:22 PM
Replies: 15
Views: 43,103
Posted By marty
Talking protect circuit

Hi Paul;
After you dis-connect the wire for pins 20 and pins 70, check to see if they work right, If they do then the problem is not in the front end of the circuit. Then take out the memory board,...
Forum: Troubleshooting 07-10-2007, 03:01 PM
Replies: 15
Views: 43,103
Posted By marty
Talking protect circuit

Hi Paul;
I have some of the circuit in front of me. So connect your other switch the middle pin to ground. there are two pull-up resisters R13, R14, check that they are BOTH 1K Resistors. they then...
Forum: Troubleshooting 07-09-2007, 03:01 AM
Replies: 15
Views: 43,103
Posted By marty
Talking protect circuit

Hi Paul;
I wrote a long letter to you and somehow it got lost, so if you see 2 posts from me this is why.
First, try this, the two wires that go to the switch find the pins on the IC and Carefully...
Forum: Troubleshooting 07-07-2007, 05:00 PM
Replies: 15
Views: 43,103
Posted By marty
Talking protect circuit

After removing the switch, check the circuit for a short, and if you have not destroyed the switch , check it. If the switch is the problem, them most likely you have dicsovered the problem. If it is...
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