DEVICE DESCRIPTIONS
PROMATRIX System User Handbook 1.1 5-25
Retrofitting Output Transformers:
Retrofitting two output transformers onto the module is possible for the case that galvanic separation of the audio
signals is needed. Therefore, separate NRS 90227 extensions are needed per output channel.
When retrofitting output 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 correspondent output channel (OUT A: R2 / R3, OUT B: R4 / R5).
4. Close the two bridges of the correspondent output channel (OUT A: LK1 / LK2, OUT B: LK3 / LK4). The
soldering pads on the printed board assembly have to be short-circuited (closed).
5. Solder the transformer onto the printed board assembly: for OUT A in position T1 and for OUT B in T2.
6. Re-insert the module into the slot and carefully push it into the DPM 4000 until it firmly locks in place.
7. Fix the module in place using the two locking screws and reconnect the mains power supply.
figure 5.30 output level jumpers, retrofitting transformers, location of parts (NRS 90218)
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