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3. MAIN MIX SOURCE MOD
This modification changes the SOURCE
matrix’s MAIN MIX selection to tap the stereo
signal before the MAIN MIX level control
(
pre
) instead of after (
post
). This could be
especially handy for live work where the engi-
neer wants to be able to control the MAIN MIX
level (sent to the house system) without
changing the level in his headphones. The
work area is on the underside of the circuit
board, near the MAIN MIX level control.
Caution:
This modification also causes the
meters to indicate pre MAIN MIX levels. They
will not longer indicate the signal level at the
MAIN OUTS, but rather the signal level at the
PHONES and CONTROL ROOM outputs (when
MAIN MIX SOURCE is selected).
1.
Remove all cords, including the power
cable, from the MS1402-VLZ.
2.
Place the mixer upside-down on a dry, non-
marring surface.
3.
Remove the screws that attach the bottom
cover. Keep track of what screws go where.
Remove the bottom cover.
4.
Using a sharp “X-acto” type knife, cut the
conductor at points ‘XL’ and ‘XR’. Be careful
to cut all the way through the conductor,
and do not cut any nearby traces.
5.
Add a jumper from point ‘YL’ to the square
pad at point ‘XL’ and from point ‘YR’ to the
square pad at point ‘XR’.
6.
Check your work very carefully, then put
the bottom cover back the way you found
it. You’re done!
4
5
cut
here
jumpers
here
