OPERATIONPower SwitchThe front panel switch is a master or "vacation" power switch. No matter whichturn-on mode you have selected, the master power switch will turn off all cir-cuitry—including the sensing circuitry. If you will not be using the amplifier foran extended period of time, turn the master power switch "Off" (push buttonswitch out). When you would like to return to normal operation, turn the switch"On" (push button switch in).Power LEDThe power LED indicates that the AC cord is plugged into a working AC powerreceptacle and that the power switch is in the "On" position.Active LEDThe rear panel turn-on mode switch determines when and how the amplifier willturn on. The "Active" LED indicates that the amplifier is operating.Protection LEDThe front panel protection LED indicates that the amplifier has been shut downbecause of either a fault in the wiring or a speaker, or with the SI-245 itself.Level Adjustment ScrewsThe front panel level adjustment screws allow you to adjust the level of theSI-245 relative to other amplifiers in your system. Use a 1/8” slotted screwdriverto adjust the screws. If the SI-245 is the only amplifier in your system, leave thescrews at their factory default position (turned fully clockwise).Cleaning and MaintenanceThe internal parts of the SI-245 are electronic and require no maintenance. Oncea year it is appropriate to twist the RCA connectors on each input to remove cor-rosion and improve conductivity.You can clean the amplifier with soft cloth or a paper towel dampened with wateror a mild detergent. Do not use any spray-type, abrasive cleaners on the amplifier.OPERATION15