Mackie MS1202-VLZ Owner's Manual - Page 27

2. 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 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 underside of the circuit board, near the channel MUTE/ ALT 3-4 switches. 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 '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 on the illustration below - 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! 6 jumper here Channels 1-4 6 jumper here 4 4 cut cut here here Channels 5-12 4 cut here 6 jumper here 4 cut here 4 cut here 6 jumper 4 here cut here 4 cut here #2: Pre-Mute Mod 4 cut here 27