A technician is troubleshooting the circuit shown in Figure A-6. The technician
ID: 2268210 • Letter: A
Question
A technician is troubleshooting the circuit shown in Figure A-6. The technician discovers that the first stage is working properly, but the second stage has no output signal at TPV5 . Which of the following would be the technician’s most logical first step to fix the circuit?
A. Replace transistor Q1 and transistor Q2 .
B. Replace voltage source B1 , transistor Q1 , and transistor Q2 .
C. Check to make sure the signal source S1 is working properly.
D. Measure the bias voltages at test points TPV1 , TPV2 , TPV3 , TPV4, TPV5, and TPV6
R7 R1 9 ka C3 B1 12 V TPV2 C2 100 F C1 TPV1 01 Load Resistor TPVE TPV3 S1 100 mv/n kHz Deg RO R2 R4 200 R3 200Explanation / Answer
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It is given that the first stage is working properly. Thus, it can be inferred that there is no problem with the dc supply as well as the source S1. Neither would there be any problems with Q1. Thus, options A,B and C are not correct choices. The correct choice is D, the most logical step for the engineer would be to check the biases at all the points TPV's.
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