BSS Audio DPR-404 Owner's Manual User Manual
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!!! CAUTION - Important Notes !!!
SERVICE SECTION
!!! WARNING - Refer all servicing to qualified service personnel !!!
Risk of electric shock if the unit is opened.
BSS Audio accepts no responsibility for injury
subsequent to opening of the unit.
In some installations, it might be necessary to separate the electronic signal
0V ground from the chassis ground to avoid earth loops.
Since both the inputs and outputs of the DPR 504 are balanced, correct
connector wiring should be alleviate this problem. Prior to continuing with this
procedure, it is recommended that you recheck all audio wiring for
correctness.
Should it be necessary, then the simple removal of an internal wire link
accomplishes this task. Refer to figure 13.2 for the location of this wire link.
To remove the wire link, you will need to remove the top cover of the unit,
and then remove the top PCB, and 4 LED PCBs. The chassis link point will
then be accessible, located between C512 and C502 labels (white silk screen)
on the main PCB.
On no occasion should the incoming safety ground wire be disconnected from
the line cord or from the internal chassis connection as an alternative to this
procedure.
13.2 Separating
signal and chassis
ground
Fig 13.2 Chassis link
location