Digital Circuit Troubleshooting Test
Complete the truth table for each of the following types of gates.
1a. AND
| A | B | Y |
| 0 | 0 | |
| 0 | 1 | |
| 1 | 0 | |
| 1 | 1 |
1b. OR
| A | B | Y |
| 0 | 0 | |
| 0 | 1 | |
| 1 | 0 | |
| 1 | 1 |
1c. NOT (inverter)
| A | Y |
| 0 | |
| 1 |
| A | B | C | Y |
| 0 | 0 | 0 | |
| 0 | 0 | 1 | |
| 0 | 1 | 0 | |
| 0 | 1 | 1 | |
| 1 | 0 | 0 | |
| 1 | 0 | 1 | |
| 1 | 1 | 0 | |
| 1 | 1 | 1 |
3. When troubleshooting the circuit in Figure 1, the technician should first check
4. In Figure 1, suppose gate U
has an output of 1 when it
should have an output of 0. When troubleshooting this circuit, the
next logical step is for the technician to check
5. In Figure 1, suppose switch A is set to 0, switch B is 1, and
switch C is 0. When the circuit is operating correctly, the output
of gate S will be
6. In general, when troubleshooting a digital circuit, in what
sequence should a technician perform the following steps? (Label the
first “1,” the second “2,” etc.)
| Replace components and verify the operation of the circuit. | |
| Check the power, switch settings, and visually inspect circuit for problems. | |
| Check components to verify that they are within specifications. | |
| Troubleshoot the circuit down to a faulty stage. |
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