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12. INPUT OVERLOAD PROTECTION FUNCTION
The IR-820SP features an internal input overload protection circuitry. If an extremely high input level is fed to
the unit, the protection circuitry automatically cuts off the signal to the speaker element.
Note
This protection circuitry does not completely protect the unit against extremely high input power levels.
Depending on the type or duration of excessive power input, the protection circuitry might not operate, resulting
in damage to the speaker element. Also, if an excessive power input continues for a long period of time, the
circuitry may not be capable of resetting to its original condition.
Use the system with care so that an excessive power input is not applied to the IR-820SP.
13. SAFETY AGENCY COMPLIANCE
This product is for indoor use only.
Products are suitable for use in general (non-fire alarm) signaling service in conjunction with compatible
Listed audio equipment, the combination of which is intended to be installed in accordance with the applicable
requirements of the National Electrical Code (NEC) and the local authority having jurisdiction.
Fire Test for Heat and Visible Smoke Release for Discrete Products and their Accessories Installed in Air-
Handling Spaces (1998) - NFPA 70 National Electrical Code (NEC) 2002, Article 300-22 (c) and NFPA 90A
Installation of air-conditioning and ventilation systems, section 2-3.10.1 (a) exception 3.
14. TROUBLESHOOTING
Symptom
Cause and Points to Check
Remedy
The power indicator
does not light when the
power switch is turned
on.
The connection cable to IR-802T is
possibly failed.
Confirm correctness of the connection
to IR-802T and connection cable. If
faulty is found, connect correctly or
replace the cable with appropriate
one.
No sound outputs.
The connection cable to IR-802T is
possibly failed.
Confirm correctness of the connection
to IR-802T and connection cable. If
faulty is found, connect correctly or
replace the cable with appropriate
one.
Noise or strange (i.e.
muddy) sound is heard.
IR-820SP is installed in close
proximity to a device generating radio
noise or infrared light.
Set the speaker properly, referring
to "7.5. Sunlight and Fluorescent
Lighting" (Refer to p. 9 ) for the
infrared wireless speaker.
Short transmission
distance.
IR-820SP is not properly installed.
Install the infrared wireless speaker
properly.
Acoustic feedback
occurs.
The microphone head is covered with
your hand(s).
Do not cover the microphone head
with your hand(s).
The IR-802T’s MID level of the
equalizer controls is set relatively
high.
Decrease the MID level of the
equalizer controls.
