THE AC MAINS AND SPEAKER LOAD MODULE IS NOT REMOVABLE. DO NOT ATTEMPT TO REPLACE OR REMOVE IT!

This module can only be serviced by a Peavey Electronics-authorized technician. Please con- sult your dealer or Peavey Electronics representative for assistance. User-inflicted damage to this module will invalidate your warranty.

SIGNAL GROUND CONNECTION

Connections at the input connector permit the audio signal ground to be connected or lifted from the chassis ground. Whenever possible, the shield of the signal source connecting cable should connect to the chassis ground. In some cases, however, particularly if an amplifier is being installed in an existing system, this may result in a ground loop. If this happens, connect the shield to the signal ground only. The chassis ground also connects to the AC ground internally. If the cable shield is connected to the signal ground only, it will be clamped to +/- 0.6V above or below chassis/AC ground.

PROTECTION FEATURES

The IA Series incorporates protection features derived from Peavey’s extensive experience with reliability. The amplifiers are ruggedly built from high quality components and feature comprehensive protection circuits to protect your amplifier from those “real world” occurrences.

CLIP LIMITING

At the amplifier’s full power, or clipping point, the channel gain will automatically be reduced, guard- ing the loudspeakers against damaging high power and continuous square waves that would other- wise be produced. This is indicated by illumination of the Clip LED. Normal program transients will not trigger Clip Limiting; only steady or excessive clipping will. Operation is virtually transparent in use and full signal bandwidth is maintained.

LOAD FAULT CORRECTION

LFC(Load Fault Correction) is an innovative circuit that will instantaneously reduce channel gain to allow the amplifier to operate at a safe level into an abnormal load. This is indicated by illumina- tion of the LFC LED. Moderate activation of LFC is inaudible in normal use. In addition, if extreme low impedance or a short circuit is encountered during high signal level conditions, the amplifier’s output relay will open.

INITIALIZATION PROTECTION(IP)

IPoperates every time the amplifier is turned on, or after a protect condition. During turn-on, the amplifier goes into protect mode and leaves the speaker load disconnected until the amplifier determines that the operating status is normal. The IPcircuit attenuates the signal during

the initial turn-on or protect operation. After relay release, channel gain gradually increases to the attenuator setting to avoid unnecessary stress on the loudspeakers.

THERMAL PROTECTION

If the heatsink temperature or power transformer reaches an abnormally high temperature, the amplifier will protect itself by disconnecting the speaker load until the amplifier returns to a normal temperature. During this time, the Protect LED will illuminate, and the cooling fan will operate at maximum speed.

SHORT CIRCUIT

If an output is shorted, the LFC, speaker relay and thermal circuits will automatically protect the amplifier. The LFCcircuit senses the short circuit as an abnormal load condition and reduces the channel gain to a safe level for the load. In extreme or severe conditions, the speaker relays will disconnect the load and initiate a power-on start-up sequence.

DC VOLTAGE PROTECTION

If an amplifier channel detects DC voltage or subsonic signals at its output terminals, the speaker relay will immediately open to prevent loudspeaker damage. The Protect LEDs will light.

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Peavey IA 800V, IA 200V, IA 400V, IA Series owner manual Signal Ground Connection, Protection Features