Mackie CR1604 User's Manual
Mackie Compact Mixers
Modifications
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General Notes about Modifications
We’ve tried to make these mixers as universal
as possible, but you can’t please everyone all
the time. For certain applications, you may
find these signal routing changes beneficial.
They’re easy to make if you have experience
soldering and working on electronic equipment, but if you don’t have the experience,
this is NOT a good place to learn. Take your
mixer and this book to a qualified technician.
Here are the obligatory warnings and disclaimers that our lawyers made us include.
We think it’s a good idea to heed them (the
warnings, not the lawyers), too.
Caution! These modification
instructions are for use by qualified personnel
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.
About Jumpers
These modifications involve cutting traces on
the circuit board and installing jumpers
between pads. We recommend solid (nonstranded) wire, 26-28 gauge. The type of wire
used for wire-wrapping is easy to form, lays
neatly against the circuit board, and has insulation that doesn’t melt easily from the heat
of a soldering iron.
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.
Jumper
BEFORE
Holes
AFTER
Solder
Mackie Disclaimer
Any modification of any Mackie product
must be performed by a competent electronic
technician. LOUD Technologies 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 technician performing
them. In the case of such damages, LOUD
Technologies may declare warranty privileges
void. BE CAREFUL!
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1202-VLZ PRO Modifications
Pre-Fader Mod (Aux To Monitor)
This modification changes AUX SEND 2 to
be
pre-fader, pre-mute
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 channels 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 1202-VLZ PRO.
2. Place the mixer upside-down on a dry,
non-marring surface.
3. Remove the screws that attach the bot-
tom 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).
instead of
post-fader, post-
Pre-Mute Mod
This modification changes AUX SEND 1 (in
post
mode) and AUX SEND 2 to receive signal regardless of the channel’s MUTE/ALT 34 switch position, but still be
knob). In order to convert the entire mixer, it
must be done on each channel. It is slightly
more involved for the stereo channels 5
through 12. The work area is on the underside of the circuit board, near the channel
MUTE/ALT 3-4 switches.
1. Remove all cords, including the power
cable, from the 1202-VLZ PRO.
2. Place the mixer upside-down on a dry,
non-marring surface.
3. Remove the screws that attach the bot-
tom 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 ‘C’ (channels 1–4) or
the conductors at points ‘CL’ and ‘CR’
(channels 5–12). Be careful to cut all the
way through the conductor, and do not
cut any nearby traces.
5. Locate the 12 pins that comprise the
underside of each MUTE/ALT 3-4 switch.
6. Add jumpers as shown in the illustration
on the next page—they’re not marked on
the circuit board itself, so be careful.
post-fader
(GAIN
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!
JUMPERS JUMPERS JUMPERS
Pre-Fader Mod
JUMPERS
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7. Repeat for all channels.
8. Check your work very carefully, then put
the bottom cover back the way you found
it. You’re done!
JUMPERS
CUTCUTCUTCUTCUTCUT
Channels 1-4
JUMPERS
CUT HERE CUT HERE
JUMPERS
Channels 5-12
CUT HERE
JUMPERS
Pre-Mute Mod
CUT HERE
JUMPERS
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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 engineer wants to be able to cotrol
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:
meters to indicate pre MAIN MIX levels.
They will no 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).
This modification also causes the
1. Remove all cords, including the power
cable, from the 1202-VLZ PRO.
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!
JUMPERS
HERE
CUT
HERE
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