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INTERNAL SETTINGS
9.3 HOW TO INSTALL EXTENSIONS
9.3.1 How to install the Input Transformer (NRS 90233, EDP-No. 121 682)
Contents NRS 90233:
1 x Input Transformer DCN340955
Installation Instructions NRS 90233:
1.Turn off the power of the DRM 4000 and open the cover plate as described before.
2.For installation of the transformer you first have to remove the printed board assembly 80478 (MAIN BOARD). Start with removing the
3.Remove the two resistors of the corresponding input channel (MIC/LINE 1: R1A / R2A, MIC/LINE 2:
R1B / R2B, MIC/LINE 3: R1C / R2C, MIC/LINE 4: R1D / R2D).
4.Using a suction pump, clean the holes for installing the transformer (9 holes per transformer) as well as the holes of the previously removed resistors from soldering tin.
5.Insert the transformer into the prepared holes (position T1A for MIC/LINE 1, position T1B for MIC/LINE 2, position T1C for MIC/LINE 3 and position T1D for MIC/LINE 4)
6.Solder the contacts of the corresponding transformer to the printed board assembly (9 soldering points per transformer).
7.Reinsert all printed board assemblies and reattach the front panel following the opposite manner of their removal. Make sure to fit all connectors and LED’s into the according holes in the front and rear panel. Tighten all
8.