Mackie 1202-VLZ Pro Reference Manual page 3

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 ste-
reo channels 5–12. The work area is on the
underside of the circuit board, near the chan-
nel 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).
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
CUT CUT
Pre-Fader Mod
JUMPERS
JUMPERS
CUT CUT
3
This modification changes AUX SEND 1 (in
post mode) and AUX SEND 2 to receive sig-
nal regardless of the channel's MUTE/ALT 3-
4 switch position, but still be post-fader (GAIN
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 under-
side 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.
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
CUT CUT