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DEVICE DESCRIPTIONS
PROANNOUNCE System User Handbook 1.1
5-10
Retrofitting Input Transformers:
In case galvanic separation of the audio signal is necessary, the module is prepared for retrofitting two input
transformers. Separate NRS 90208 extensions consisting of audio transformer and insulation plate each are needed
per input channel.
When retrofitting the 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 the slot.
3. Remove the two resistors of the corresponding input channel (IN A: R6 / R7, IN B: R3 / R8).
4. Place the insulation plate between the transformer and the printed board assembly and solder the transformer to
position T1 for IN A or to position T2 for IN B.
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 5.10 retrofitting the input transformers, location of parts (NRS 90215)