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Old 18th December 2011, 10:38 PM   #1
techRD2 is offline techRD2  United States
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Question heathkit aj-1510 keyboard

My Heathkit AJ-1510 has a keyboard programming problem. Have run company diags to no avail. All key inputs except 8 or 9 perform as expected. When the 8 or 9 key is depressed the programmer board floods the display with 889 or 999. I have checked the keyboard circuity and the programmer board. All other functions work normally, help, I'm lost.
Thanks, Michael
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Old 19th December 2011, 12:11 PM   #2
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It sounds like two data lines are shorted together.
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