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diagram 10 Printed board assembly 81331 showing the position of the input transformers NRS 90208
9.4 Monitor Output Transformer NRS 90227 Offering A Floating, Balanced MONITOR Output
In case a floating MONITOR output is needed, the monitor amplifier’ output is prepared for retrofitting an
output transformer. Herefore, you will need the extension kit NRS 90227.
Caution Unplug the mains cord and disconnect batteries before opening the appliance!
9.4.1 To Install The NRS 90227 Proceed As Follows: (see diagram 10)
- for opening the appliance, please remove the 9 screws on the top of the appliance that lock the
cover plate.
- de-install the input printed board assembly 81331 following the description in the paragraph 9.3.1.
- disconnect the resistors R95, R96, R97 and R101 before installing the monitor output transformer.
- mount the monitor output transformer on the printed board assembly 81331; in doing so, polarity is
of no importance, since the transformer is balanced.
reinstall the input printed board assembly 81331 following the description in paragraph 9.3.1.
- closing the appliance: use the 9 screws M3 x 6 DIN 7500 to reattach the cover plate.
10. 19"-Flightcase Or 19"-Rack System Installation
Caution Operating the DPA 4411 without cover-plate is not admissible.
When incorporating the DPA 4411 into a 19" flightcase or 19" rack system, make sure to leave room for
sufficient air-flow. Between the amplifier’s rear plate and the inside-wall of the surrounding enclosure has
to be at least 60 mm x 330 mm of space until up to the enclosures top or its ventilation gaps. At least 100
mm of space should be left above a rack system to guarantee sufficient air circulation. Since, during the
operation of the DPA 4411 the environmental temperature within the rack closet may increase by about
10° C, minding the maximum allowable temperature values for other equipment that is installed into the
same rack system or enclosure is of major importance.
Note For trouble-free operation of the appliance, the maximum environmental temperature
of +40 °C is not to be exceeded.
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