8-45F1 D
A circuit card in a RADAR system has just been replaced with a spare card. You notice the voltage level at point E in Fig. 8F12 is negative 4.75 volts when the inputs are all at 5 volts. The problem is:
A. The 25 K resistor is open.
B. The 100 K resistor has been mistakenly replaced with a 50 K resistor.
C. The op amp is at the rail voltage.
D. The 50 K resistor has been mistakenly replaced with a 25 K resistor.
