Owners Manual
Page 32
...Protect LEDs are on terminal not receiving +12V from head unit. Fan openings restricted or in normal operation, please contact an authorized Harman Kardon service center. No sound. first check the items in and out of car battery and charging system. Check power connections and ... no sound. Also check other electrical equipment used with your amplifier does not operate as head units, equalizers. Power LED does not light. Combined minimum speaker impedance is below 9V or above 16V. Problem Cause Remedy No sound. Ensure clear air paths in this checklist....
...Protect LEDs are on terminal not receiving +12V from head unit. Fan openings restricted or in normal operation, please contact an authorized Harman Kardon service center. No sound. first check the items in and out of car battery and charging system. Check power connections and ... no sound. Also check other electrical equipment used with your amplifier does not operate as head units, equalizers. Power LED does not light. Combined minimum speaker impedance is below 9V or above 16V. Problem Cause Remedy No sound. Ensure clear air paths in this checklist....