lyrnxG Posted August 8, 2012 Report Share Posted August 8, 2012 Hey guys, I just received a second hand Lectrosonics mm400c today. I put a brand new battery in and tried to power it up, but had no success. Long story short, here are some steps I found useful for a possible quick fix. If the LEDs do not turn on then chances are the switch is to blame. The housing of these units is fully enclosed and power on is done with a magnetic button through the outer wall (waterproof design). Sometimes magnets might fall too far out of alignment and need to be sent in, but give this a try before the hassle. Picture 1 shows the magnet switch at off. Slide it to the middle where you will see to nubs that hold the button in tact expose (picture 2). Use tweezers, or something similar to pry the button out of the middle (picture 3). Now proceed to clean all the grooves from possible dirt or erosion, and place the button back in. I found in my case, there was just enough crud to prevent the sliding power switch to fully reach the on position. Hope this helps. Cheers! Quote Link to comment Share on other sites More sharing options...
karlw Posted August 8, 2012 Report Share Posted August 8, 2012 Like Quote Link to comment Share on other sites More sharing options...
LarryF Posted August 8, 2012 Report Share Posted August 8, 2012 The switch turns the unit off, i.e., if the switch slider is removed completely, the unit will be ON. From the manual: Power ON/OFF Switch A waterproof, magnetic Power ON/OFF switch is located on the unit's side panel. The switch actually consists of two components. A magnetically actuated internal component and a magnet housing assembly. The switch is designed so that the unit will still operate if the Switch Magnet Housing Assembly is missing or removed. The function of the Power ON/OFF Switch can also be changed so it operates as an audio mute switch. (See Operating Instructions, Power Switch Function Selection.) These functions are illustrated in the chart below: Power Switch Position Function ON OFF Normal, or Applies Power Turns Unit Off Power Mode to Unit Audio Mute Turns On Audio Mutes Audio Mode If the MM400C Power ON/OFF Switch has been configured for Audio Mute Mode, it is still possible to turn off the transmitter without removing the battery. This is done by placing the switch in the ON position, then toggling the switch between the ON and OFF position three times in less than five seconds, i.e., ON (Starting Position)-OFF-ON-OFF-ON-OFF. The user-selected configuration of the Power ON/OFF switch is stored in memory Best, Larry F Lectro Quote Link to comment Share on other sites More sharing options...
studiomprd Posted August 8, 2012 Report Share Posted August 8, 2012 great stuff in the manuals... but nobody wants to read them Quote Link to comment Share on other sites More sharing options...
LarryF Posted August 8, 2012 Report Share Posted August 8, 2012 My point being that the MM switch is fail safe and does other cute things, not that (God Forbid) anyone should read the manuals. In fact, we are thinking of saving money by reprinting old Manx Norton motorcycle manuals for the next new products and see if anyone notices. In Half Jest, Larry F Quote Link to comment Share on other sites More sharing options...
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