You are troubleshooting a TTL circuit board containing dozens of IC chips. You have taken several readings at numerous IC chips but the readings are inconclusive because of their erratic nature. Assuming the circuit worked properly at one time, what is the most likely cause of the problem?
A) A solder bridge between the inputs on the first IC chip on the board
B) A defective output IC chip that has an internal open to Vcc
C) An open connection between the inputs on the first IC chip on the board
D) A defective IC chip that is drawing excessive current from the power supply
D
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A. 111 0001 0001 B. 111 0001 0111 C. 111 0011 0110 D. 1100 1010 0101
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A vehicle's reverse lights are always on, even in "drive." What is the most likely cause?
a. A misadjusted neutral safety switch b. An open neutral safety switch c. One of the reverse light bulbs has been installed backward d. The wrong bulb was installed for the reverse lights