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THE FOLLOWING INFORMATION IS FOR THE USE OF QUALIFIED SERVICE
PERSONNEL ONLY
Do not attempt any of the following adjustments yourself
The following adjustments require the removal of the cover. Proceed as follows:-
1.
Disconnect the unit from the mains and DC supply.
2.
Remove the eight pozidrive cover screws, 3 on the top, 2 on each side and 1
on the rear.
Keep these safe for reuse later. Lift off the cover.
Voltage Changeover
The unit is normally shipped preset to the mains supply voltage required for the country. This is indicated
on the rear panel.
To select the alternative voltage it is only necessary to slide the voltage selector switch, located to the
right of the mains transformer, to the other position.
Please ensure that the rear panel voltage label is removed and replaced with one stating the new voltage
setting.
Making the DN330 the system ground reference
Under certain unusual operating environments it may be necessary to use the equaliser as the main
ground reference and tie other signal grounds to it. This is easily accomplished as follows:-
1.
Remove the M3 pozidrive screw located in the centre of the board labelled ‘ST3.’ &
‘Ground Link’.
2.
Fit a solder tag onto the screw and refit ensuring the tag is located over the bare pcb section
to the left of the screw.
3.
Solder the tag to the circuit board.
4.
Replace the cover after adjustment.
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