User manual LEXICON LX

[. . . ] User Guide IMPORTANT SAFETY INSTRUCTIONS 1) 2) 3) 4) 5) 6) 7) 8) 9) Read these instructions. Install in accordance with the manufacturer's instructions. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatuses that produce heat. Do not defeat the safety purpose of the polarized or grounding-type plug. [. . . ] When set to ON or DELAY, only the external device connected to the TRIGGER INPUT can be used to power the amplifier on and off. The front panel standby button will not power the unit on and off. (However, the standby LED still functions normally. ) When set to DELAY, the normal 5 second power on delay is extended to approximately 7 seconds. The TRIGGER INPUT Switch setting will not take effect until the amplifier has been power cycled. Make sure the amplifier is powered off when the MODE switch setting is changed. INPUTs and OUTPUTs used in (BRIDGED) mode are labelled in parenthesis. Do not use other INPUTs and OUTPUTs that are not labelled in parenthesis. Connect the positive speaker lead to the positive (red) OUTPUT of the first channel, and connect the negative speaker lead to the positive (red) OUTPUT of the second channel. UNBAL/BAL Switch Selects between unbalanced (RCA) or balanced (XLR, tip/ring/ sleeve) audio input for each channel. Power the amplifier off or reduce system volume before changing the setting of the UNBAL/BAL switch. If the amplifier is connected to a digital controller such as the MC-12, output levels should be re-calibrated whenever the setting is changed. GROUND LIFT Switch When set to ON, isolates the ground connection between the audio inputs and the chassis. This can be useful for eliminating audible hum or noise caused by multiple grounding paths in the system. When set to OFF, the audio inputs are grounded to the chassis. This switch should be set to ON whenever there is ground noise present in the system. WARNING Do not defeat or remove the ground prong on the AC power cord. This will result in a safety hazard, and will not reduce audible hum. The GROUND LIFT switch has no effect on the safety ground of the amplifier. 2-7 Basic Operation COOLING SYSTEM The LX Power Amplifiers use temperature-controlled fans to exhaust heat. Heatsink temperatures are measured hundreds of times each second. Under most conditions, the fans are set to a slow speed. When the temperature climbs above 85C, the fans are set to a medium speed. When the temperature climbs above 100C, the fans are set to a high speed. Lexicon JTS's dynamic nature enables it to avoid the problems inherent in competing products that rely only on heatsink temperatures. Heatsink temperatures do not always correlate to the temperatures inside the output transistors. JTS is calibrated by device parameters, which allow it to predict overheating even if the heatsinks are relatively cool. [. . . ] Damage to a unit that has been altered, or on which the serial number has been defaced, modified, or removed. Include a copy of the original dated sales receipt. (A copy of the original dated sales receipt must be presented whenever warranty service is required. ) Do not include accessories such as power cords or user guides unless instructed to do so. will pay all labor and material expenses for covered items. [. . . ]