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lyrnxG

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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!

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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

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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

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