21
NOTE:
Since both the audio inputs and outputs are wired fully balanced we
would suggest that you fully recheck all audio wiring for correctness
prior to proceeding.
All DPR-901ii units are shipped with the signal 0v/ground connected to
the metal chassis via a wire link, and an rf bypass capacitor on the main
pcb. The chassis is also dirctly connected to the (mains) safety ground/
Earth. In the unlikely event that you need to remove the signal 0v/ground
to chassis link, or if you need to add a small impedance to reduce earth
loop currents, then proceed as follows. Please refer to FIG A1.1.
SAFETY NOTE !!
Under no circumstances should the incoming safety ground wire be
disconnected from the power line cord or from the internal chassis
connection as an alternative to this procedure.
1: Disconnect the mains power cord and remove the unit’s top cover.
2: Locate LK11 and C145 at the far right hand end of the pcb, next to the
transformer. See Fig A1.1 below.
3: Remove and/or replace one or both of these depending on what is
required. The wire link provides a direct connection at dc and low
frequencies, whilst the capacitor provides a low impedance link at
higher frequencies.
4: With both removed, the signal 0v is completely separated from the
chassis.
Appendix A
A1 Chassis/0V Link
Removal.
Chassis/0V Link Removal
C145 and LK11
Fig A1.1 Chassis/0V
Links
Summary of Contents for DPR-901ii
Page 19: ...19 Using the DPR 901ii 5 1 DPR 901ii Block Diagram ...
Page 28: ...2 8 DPR 901ii User Notes ...
Page 29: ...29 User Notes ...
Page 30: ...3 0 DPR 901ii ...
