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Troubleshooting checklist
Most of the problems experienced by customers are due to installation or operational problems.
If
your amplifier does not operate as ex-
pected. first check the items in this checklist. Also check other related components, such as head units, equalizers. crossovers, speakers,
and other electrical equipment used with your amplifier. If you still have difficulties in normal operation, please contact an authorized
Harman Kardon service center.
Problem Cause Remedy
No sound. Power LED does not light.
No 12V (positive) at
B+
terminal.
Check power connections and fuses.
Remote-on terminal not receiving +12V Check remote-on connections.
from head unit.
Power ground connection(s) (negative) is Check power grounds.
poor.
Car battery voltage is below 9V or above Check condition of car battery and
16V. charging system.
No sound. Power and Protect LEDs are
lit
Speaker or speaker wire shorted.
Check speaker wiring and speakers.
immediately upon turn-on.
Amplifier plays for a short time, then no
Fan openings restricted or in "dead air." Ensure clear air paths in and out of fan
sound. Power and Protect LEDs are on. openings.
Combined minimum speaker impedance Reconfigure speakers and crossovers for
is too low.
minimum impedance load (see "Series-
Parallel and minimum impedance speaker
connect ion").
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