Dynacord DPM 4000 manual PROANNOUNCE System User Handbook

DEVICE DESCRIPTIONS

Retrofitting Input Transformers:

Retrofitting two input transformers onto the module is possible for the case that galvanic separation of the audio signals is needed. For the DPC 4000 input a NRS 90208 extension is needed, which consists of an audio transformer and an insulation plate. For the MIC/LINE input a NRS 90233 extension is needed.

When retrofitting input transformers, please proceed as follows:

1.Disconnect the DPM 4000 from the mains power supply.

2.Loosen the two locking screws and carefully slide the module out of its slot.

3.Remove the two resistors of the corresponding input channel (IN A: R8 / R9, IN B: R3 / R4).

4.With the DPC 4000 input (IN A), you have to place the insulation plate between the transformer and the printed board assembly. Then solder the transformer in position T2; with the MIC/LINE input (IN B), you have to solder the transformer in position T1.

5.Re-insert the module into the slot and carefully push it into the DPM 4000 until it firmly locks in place.

6.Fix the module in place using the two locking screws and reconnect the power supply.

figure 5.26 retrofitting the input transformers, internal settings, location of parts (NRS 90234)

5-22 PROANNOUNCE System User Handbook 1.1