K+H KPA 2290 Operating Manual

Contents

K+H KPA 2290 Operating Manual Manual pdf 23 page image

Klein + HummelOperating Manual KPA Series English 21■ ProtectionTurn-On/Turn-Off mutingFor about four seconds after turn-on, and immediately at turn-off, the amplifier outputs are muted.Short circuit protectionA short circuit protection system safeguards the amplifier’s output transistors under short circuits and otherstressful loads. It is completely inaudible when inactive. In case of short circuit, the red LED will be light-up andwriting ”PROT” appears in the first line of the display(see Par. “The main screen” for a detailed description). Theamplifier will reset himself 5 times every 2 seconds. Once 50 resets have been performed and the fault still exist onthe output, the unit sets into steady protection mode. Turn ON/OFF cycle is needed to restart the unit.Thermal protectionA KPA amplifier uses a continuously variable speed fan to assist cooling (the fan speed changes in response to theamplifier’s cooling needs). If the heat sink temperature reaches approximately 80°C, the yellow LED starts toflashing. If the temperature is more then 85°C the thermal sensing circuitry will mute each power sectionthe amplifier will automatically reset and the LED will be go out. It is possible to reduce the temperature byreducing the output power.DC fault protectionIf DC or excessive subsonic energy appears at a channel output, an instantaneous protection circuit will cut off thepower supply for both channels. Power supply shutdown is used instead of speaker relays, thereby improving thedamping factor and reliability of the KPA amplifiers.Input/Output protectionAn ultrasonic network decouples RF from the outputs and keeps the amplifier stable with reactive loads.■ User maintenanceCleaningDisconnect the amplifier from the AC main source first; use a soft cloth and mild non-abrasive solution to clean thefaceplate and chassis.Removing Front CoverTo remove the amp front cover (seefigure 33) push a pen or a small screwdriver into the ventilation hole at thelocation shown to release the lock. Pull the cover to the front and flip it to the right. Please remove the front grillecarefully. The dust filter may be directly removed for cleaning.

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This manual is suitable for:

KPA 2220 KPA 2290 KPA 2400 KPA Series

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