PLM Series Operation Manual rev 1.1.39. Front Panel Interface459.10.1.4 Power Output MuteThe four soft function buttons (5-8) located on the right hand of the screen control the Power Output Mutesof output channels 1-4 respectively.These mutes are located within the PLM’s power output stage.When the selected output is muted, the soft button’s integral LED turns red and the text AMP CH. MUTEis displayed in inverse video. When unmuted, the integral LED turns green (unless any other output warningconditions are active).9.10.2 LED faults, warnings, and clip indicationsA tricolor LED is embedded inside each of the eight soft function buttons. These convey a variety of statusindications: faults and warnings; signal clip indications; and PLM Module Input, Module Output and PowerOutput mute status.LED Color StatusGreen Status GoodYellow WarningRed Fault or MuteFlashing Red ClipTable 9.10.2: LED fault and warning indicationsThe above list only applies to warnings, faultand clip indications, not mute statuse.An unlit output LED indicates that the outputchannel is not routed to a Module output.Under normal operating conditions (i.e. in METER mode, with no fault conditions), seven of the LEDsprovide indication of PLM/Frame network connectivity to the Lake Controller software, plus mute statusindication for the two Module inputs (A and B) and the four output channels (1 thru 4). The eighth button iscurrently unused.The positions of the LEDs logically follow the signal flow, with Module inputs located on the left of thescreen and outputs on the right. See section 9.10.1 Mute Functions for further information concerning Muteoperation.If an output fault condition arises the LEDs willindicate this status and not the output mutecondition, thus remaining red if the output is alreadymuted. However, a textual description of the fault isprovided on the display. The output mute status can still beviewed via the MENU system or the Lake Controller software.