I managed to zap a zener diode in a circuit and cannot read its value. It is a fairly simple circuit. It is basically a bank of 14 diodes each with a resistor of 300 ohms in series. The zener just goes across positive and negative near the input connector. Im assuming that it it there for overcurrent protection? I do not know the input voltage of the circuit. Is there a way to figure out what value to replace it with? What would happen if I did not replace it?. The diode is unreadable. I would also assume that the circuit would work without the diode.