A technician tests the circuit of Figure 9-4 as described in Example 9-7 and finds that the correct output is activated for each possible input code except those listed in Table 9-8. Examine this table and determine the probable cause of the malfunction.

Data from Example 9-7

A technician tests the circuit of Figure 9-4 by using a set of switches to apply the input code at A₄ through A₀. She runs through each possible input code and checks the corresponding decoder output to see if it is activated. She observes that all of the odd-numbered outputs respond correctly, but all of the even-numbered outputs fail to respond when their code is applied. What are the most probable faults?

Figure 9-4

Transcribed Image Text:

TABLE 9-8 Input Code A4 A3 A2 A₁ A0 1000 0 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0 0 1 0 101 1 10 11 1 1 1 1 1 0 1 0 1 Activated Outputs 016 and Ō24 017 and 025 018 and 026 019 and 027 020 and Ō28 021 and Ō29 Ō22 and Ō30 023 and 031