powersoft KDSP Technical Notes page 2

Before operating for the installation of the K-DSP board it is
necessary to check if the rails are completely discharged: leds in
FIGURE 8 should be off, this should happen after about 15 minutes
that the amplifier has been switched off and disconnected from
the mains.
FIGURE 8: Rail leds
If the leds are still on it is suggested to discharge the capacitors
bank by connecting a lamp of at least 40 W / 230 V, best if 60 W /
230 V (FIGURE 16) to the connectors positioned as on FIGURE 9 and
FIGURE 10 to avoid harmful current stored in the capacitors bank.
FIGURE 9: Dummy load lamp
FIGURE 10: Discharging connectors
Keeping a leg of the dummy load on one of the two "GND"
connectors, first touch with the other leg one of the right "+VCC"
connectors, and then one of the left "-VCC" connectors (as
showed in FIGURE 11).
Locate the control board, positioned in the front left corner
FIGURE 11: Detail of discharging connectors
of the amplifier, as in FIGURE 12 and remove the screws of the
7 r ail l eds s hould b e o ff o r i t
control board with a Phillips PH0 screwdriver.
is n eeded t o d ischarge
Screw on the same holes the brass spacers support standoff
capacitors b ank
as on FIGURE 13.
FIGURE 12: Screws of the control board to be removed
FIGURE 13: Brass spacers positioned
Be careful in both removing the screws and positioning the
brass spacers support standoff: help yourself with a long needle
nose solid joint pliers for avoiding any piece to fall under control
board.
Carefully position the DSP board on top of the control board,
pay particular attention to the four connectors of both boards,
they have to mate perfectly, do not press the board until you're
sure that connectors are exactly in position or it's possible to
damage the amplifier!
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