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IL120s
8) Connect the subwoofer amplifier to an AC power source; turn the unit ON. Measure the DC voltage at the �CD±� wires; it should be 10-20 volts. 9) If it is 25 volts or greater, turn the amplifier OFF, disconnect from the power source, and replace: IL120S, IL60: Q504,Q507 IRF640 on the Power Supply PCB, Infinity part# QM0015. IL50, IL100s: Q1 IRF540 on the Power Supply PCB, Infinity part# QM0020. 10) If the voltage is normal, turn the amplifier OFF, disconnect from the power source, and reconnect the �CD±� leads. 11) Finish reassembling the amplifier, remount the heatsink, replace the amplifier in the cabinet and test the subwoofer.
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