When the combination lock of Figure 5-103 is tested, it is found that entering the correct combination
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When the combination lock of Figure 5-103 is tested, it is found that entering the correct combination does not open the lock. A logic probe check shows that entering the correct first combination sets Q1 HIGH, but entering the correct second combination produces only a momentary pulse at Q2. Consider each of the following faults and indicate which one(s) could produce the observed operation. Explain each choice.
(a) Switch bounce at SWA, SWB, or SWC.
(b) CLR input of Q2 is open.
(c) Connection from NAND gate 4 output to NAND gate 3 input is open.
Figure 5-103
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Related Book For
Digital Systems Principles And Application
ISBN: 9780134220130
12th Edition
Authors: Ronald Tocci, Neal Widmer, Gregory Moss
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