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For most folks, the MS1202-VLZ works just
fine the way it is. But for special applications,
there are three signal routing changes that can
be performed easily on the MS1202-VLZ. Easy
for someone with soldering experience, that is.
If you don’t know how to solder, find a techni-
cian that can. This is NOT a good place to learn!
• Modification A changes AUX SEND 2 to be
pre-fader,
pre-mute
instead of
post-fader
,
post-mute
.
• Mod B changes AUX SEND 1 (in
post
mode) and AUX SEND 2 to receive signal
regardless of the channel’s MUTE/ALT
switch position, but still be
post-fader
(GAIN knob).
• Mod C changes the SOURCE matrix’s
MAIN MIX selection to tap the stereo
signal before the MAIN MIX level control
(
pre
) instead of after (
post
).
UL Warning
Caution! These modification instructions
are for use by qualified personnel only. To
avoid electric shock, do not perform any ser-
vicing other than changing the fuse unless
you are qualified to do so. Refer all servicing
and modifying to qualified personnel.
Mackie Disclaimer
Any modification of any Mackie Designs
product must be performed by a competent
electronic technician. Mackie Designs
accepts no responsibility for any damages
or injuries caused by any modification,
regardless of the source of the modification
instructions or the qualifications of the tech-
nician performing them. In the case of such
damages, Mackie Designs may declare
warranty privileges void. BE CAREFUL!
A Note About Jumpers
When installing jumpers, do
not
run their
ends through holes in the circuit board.
Rather, solder them flat against the desired
pad (the flat silver area, possibly with a hole in
the middle). Make sure the ends of these flat
wires do not extend beyond the pad.
1. PRE-FADER MOD (AUX TO MONITOR)
This modification changes AUX SEND 2 to
be
pre-fader,
pre-mute
instead of
post-fader,
post-mute
. (“Fader” refers to the channel
GAIN knob, and “Mute” refers to the channel’s
MUTE/ALT 3-4 switch.) In order to convert the
entire mixer, it must be done on each channel.
Is slightly more involved for the stereo chan-
nels 5–12. The work area is on the underside
of the circuit board, near the channel AUX
SEND knobs.
1.
Remove all cords, including the power
cable, from the MS1202-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 point ‘A’ (channels 1–4) or
the conductors at points ‘AL’ and ‘AR’
(channels 5–12). Be careful to cut all the
way through the conductor, and do not cut
any nearby traces.
5.
Add a jumper from point ‘B’ to the square pad
at point ‘A’ (channels 1–4) or from points ‘BL’
to ‘AL’ and ‘BR’ to ‘AR’ (channels 5–12).
6.
Repeat for all channels.
7.
Check your work very carefully, then put
the bottom cover back the way you found
it. You’re done!
MODIFICATIONS
Solder
AFTER
Holes
Jumper
BEFORE
Ch.’s 1–4
A
B
4
Ch.’s 5–12
AL
BL
BR
AR
4
5
5
cut
here
jumper
here
cut
here
jumper
here
#1: Pre-Fader Mod
