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9.3.2 How to install the Output Transformer (NRS 90227, EDP-No. 121 679)
Contents NRS 90227:
1 x Output Transformer DCN354596
Installation Instructions NRS 90227:
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 EQ-board 82228.1 by loosening its three locking-screws and tipping
the small board over to the rear. Now, loosen all screws of the printed board assembly 80478 (15
screws on the rear panel and 3 screws on the front panel, which lock the sockets in place, 7 screws
and 3 bolts on the printed board assembly itself). Also loosen the two locking screws of the front
panel on the bottom plate of the appliance. Remove the potentiometer-caps from the 8 channel
controls and the 2 master controls by pulling them off to the front. Detach the front panel. If an
interface-board has previously been installed, remove it temporarily. After slightly lifting the front of
the printed board assembly 80478, pull it to the front of the appliance so that the connectors are free
of the rear panel. Now, you are able to remove the printed board assembly 80478 so that it is
accessible for installing the transformer.
3. Remove the two resistors of the corresponding output channel (OUT A: R21R / R22R, OUT B:
R61R / R62R).
4. Using a suction pump, clean the holes for installing the transformer (10 holes per transformer)
as well as the holes of the previously removed resistors from soldering tin.
5. For OUT A insert the transformer into the prepared holes at position T1R, for OUT B insert it at
position T2R. Make sure that the transformer’s pin marked as pin 1 fits into the hole on the printed
board assembly, which is also marked as hole 1.
6. Solder the contacts of the corresponding transformer to the printed board assembly (10 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 locking-screws. Reinsert the interface-board, if you have previously removed it.
8. Re-install the cover plate as described above.
INTERNAL SETTINGS
9-5