Earlier today I made the modification to the DR-100MKII which went pretty smoothly. To perform the modification first remove both the main battery as well as the reserve batteries , then remove the two Black screws on the rear panel located near the top just below the built in microphones. You may now remove the rear panel and remove the two screws holding the tripod mounting bracket which need to be removed to gain access to the battery box which needs to be removed. Remove the three black screws holding the battery box in place. Carefully remove the battery box which has the TRRS connector board attached to it with a small screw located on the bottom of the battery box remove the battery box completely by compressing the spring on the side of the battery box so that you are able to slip it through the opening in the bottom of the battery box. You should now have fairly good access to the area that you need to work on inside of the recorder without further dis-assembly of the recorder.
I used a Lemo connector which is extremely small and required opening up the hole left from the removal of the TRRS connector with a 7/16" drill bit. After carefully enlarging the hole to accommodate the connector I installed the connector with the washer and nut which was supplied with it. This Lemo miniature connector is a locking connector which is keyed. I will not be using the remote control functions of the recorder so will not be reinstalling the TRRS board which is simply jumped to the audio board with 5 clearly labelled connections. The wires from the TRRS board were desoldered and connections to the new connector were made using the Blue wire from the Audio Board which is labelled "C" which is the signal, and the Black wire which is labelled "G" which is ground.
You may now reassemble the recorder. I then proceeded to assemble a new interconnecting cable to run from my a/d microphone preamplifier which I had previously modified with a locking spdif connector so that I will have locking connectors on both ends of the cable preventing unintended disconnections when people inadvertently bump into you at concerts during the show. This has happened on more than a few occasions and is very aggravating as it obviously causes a gap in the recording.
The cable assembly took longer than expected as it requires 28 gauge wire or smaller to fit into the solder cups on the pins of the connector which we did not have at the time of assembly. I was attempting to use RG179B shielded coax and the center conductor was ok' however when using a smaller number of strands from the shield of the coax the wire could not handle any stress at all. Lemo happens to make a special cable which has three conductors and is shielded which is designed specifically for use with this connector which I am ordering on Monday. I had a short piece of it provided as a sample which in hind sight I should have purchased ahead of time but things do not always go as planned!
We were able to verify that the recorder modification does in fact work correctly and all that remains is to complete the cable assemblies later next week and I will be a happy camper once again. I have included some photographs for others to see what the internals of the recorder look like and how the modification looks installed on the DR100 MKII.