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UL Warning
CAUTION! These modi-
fication instructions are
for use by qualified per-
sonnel only. To avoid
electric shock, do not perform any servicing
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 prod-
uct must be performed by a competent electronic
technician. Mackie Designs accepts no responsi-
bility for any damages or injuries caused by any
modification, regardless of the source of the modi-
fication instructions or the qualifications of the
technician performing them. In the case of such
damages, Mackie Designs may declare warranty
privileges void. BE CAREFUL!
About Jumpers
We recommend solid (non-stranded) wire,
26–28 gauge (wire-wrapping variety). When in-
stalling jumpers, do not run their ends through
holes in the circuit board. Rather, solder them flat
against the desired pad (the flat silver area, possi-
bly with a hole in the middle). Make sure the ends
of these flat wires do not extend beyond the pad.
CR1604-VLZ Source Mod
This changes the
C-R/PHONES
level control
in the
SOURCE
matrix to receive the main mix
stereo signal pre-
MAIN L-R MIX
fader instead
of post-
MAIN L-R MIX
fader.
You can accomplish the same result that this
modification provides by using two standard
1
⁄
4
"
tip-sleeve “jumper cables” plugged into the
MAIN
INSERT
(
L
and
R
) to the first click and the other
end plugged into
STEREO AUX RETURN 4
,
assigned to
C-R/PHNS ONLY
.
STEREO AUX
RETURN 4
level will control the volume as well as
C-R/PHONES
level control.
You can also use the
TAPE INPUT
(
L
and
R
)
RCA jacks (you will need
1
⁄
4
" to RCA cables or
adapters) and assign the
TAPE
source button in
the
SOURCE
matrix.
1. Remove all cords, including the power cable,
from the CR1604-VLZ.
2. Place the mixer upside-down on a dry, non-
marring surface.
3. If you have converted your mixer to the rack-
mount position or have installed a RotoPod,
undo those changes and temporarily configure
the mixer in the original desktop mode. You do
not have to install the pod, just get it out of the
way of the bottom cover.
4. Remove the screws that attach the bottom
cover. Keep track of what screws go where.
Remove the bottom cover.
5. Cut the conductor at points ZL and ZR,
between the square and round pads. Be
careful to cut all the way through the conduc-
tor, and do no cut any nearby traces.
6. Add a jumper from the square pad at point YL
to the square pad at point ZL and another
from the square pad at point YR to the square
pad at point ZR.
7. Check your work very carefully, then put the
bottom cover back the way you found it.
You’re done!
Holes
Jumper
Solder
BEFORE
AFTER
7
6
j
umpers
here
cut
here