I plugged in two separate Sennheiser transmitters to the Panasonic HVX200 - one in each XLR connector. This is for Senneheiser wireless lav mics. I set both XLRs to mic and set the settings under the LCD screen to input 1 and input 2 and set both channel 1 and channel 2 on (again both under the LCD screen). I only get audio from Channel 1. But both mics are registered on Channel 1. No sound levels on Channel 2. What am I doing wrong?

This will never work together. They are on different frequencies

Mic plug has been replaced (new lav mic) so that leaves the mic jack connected to the body transmitter. Corrosion is a possibility...

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but I think it's something to do with the mic jack on the transmitter. Some units solder these connectors directly to the internal PC board and after a while, the solder connections break. Have a tech open it up and closely inspect the input jack's solder pads.

Have you looked in the manual ?

You need power from the transmitter to power this mic. See your mics specs to determine if it needs "Phantom Power"
Perhaps the transmitter doesn't supply power. Condenser mics may not work. Stay with the dynamic type. IMHO

Here is the standard wiring diagram for a mini XLR : http://www.smartwireless.co.uk/users/UserFiles/File/Pin%20wiring%20details%20for%20Smart%20beltpacks.jpg Have a look at this post:http://www.dvinfo.net/forum/all-things-audio/128889-sennheiser-sk100-jack-confusion.html If that doesn't help try this company for info by contacting them with your problem as they sell a variety of adapters:http://www.hosatech.com/contact/contact.php

Pretty easy, connect it to the xlr connector (hope your lav do have xlr connector) then swith the external mic switch on, phantom power switch to on, and front switch to mic (not line) and ajust the level.

This is probably interference in the wireless connection for the lavalier mic.
Try switching channels to find a clear one!
Or switch to a wired lav mic if that's practical.

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Hi, on the left side of the camera you can set 'audio monitor'. Default is channel 1/2. You can choose to listen to 3/4 or 1/2 and 3/4 simultaneous.
In the menu of the cam you can set between 12 bit audio recording or 16 bit. 16 bit only records on channel 1/2 (the front mic). In 12 bit mode you can record audio on 4 channels.
hope this answers a bit of your question

Could be your capture device.  Isolate this problem by monitoring the quality of the audio at the RF reciever, then monitor it at the camera.  I'm assuming you do not have a EFP mixer or other device that will actually measure your Dbm or Vu levels - what happens if you play the tape in the camera and monitor the output of the camera with an external device - even a TV or stereo? If it sounds good on your TV turn your attention to the capture card.

Hi I hope this will help http://www.dvcentral.org/tricks.html Tricks 4 XLR ins: Get the Canon MA-300 adapter and get yourself 4 XLR inputs. Perfect for a couple of wireless lavs, a boom, and another mic. Sure, it's less data for the audio channels, but it's plenty for voice recording. Sure, you can't digitize audio 3&4 easily, but it is possible, and it's just so darn useful to have four audio channels in the field. (Also, you can easily mount the wireless lav receivers right on the back of the camera.) Using the Canon on-camera mic via an XLR input: Say you're using a single boom mic, inputting via XLR 1. You've got XLR 2 doing nothing, and the on-camera mic doing nothing. Seems a waste. Well, all you need to do is adapt the on-camera mic to input through XLR 2. A short female-mini-to-male-XLR adapter will do for the audio signal, but the mic needs power. Simple, just get a short micro-mini extender cable, plug one end on to the mic, and the other into where the mic's connector would normally plug, on the camera's handle. Make sure the mic is switched to stereo, and voila, you have a second XLR mic. Monitoring in the field: Though many people told me it couldn't, the XL H1 downconverts to NTSC on the fly during recording, so you can plug a little monitor or deck into the video and audio out jacks and have yourself a video tap. Perfect for the director who wants to see what's going on through the camera. I used a little DV camera, and recorded it all so we could have a playback tape if needed. Very useful. (Note that the output NTSC is anamorphic, stretching the 16:9 image over the whole 4:3 frame. A monitor with a 16:9 switch is useful, or something that automatically adapts, such as what I used, a Sony PD-100 DVCAM camera.) Native slow motion: In a 24F project, shoot 30F and use Cinema Tools to slow down the footage to 24fps for a slight slow motion effect. Use 1/60 shutter speed for a standard look, or 1/30 for a slightly dreamier feel. Good Luck.