Mackie CR1604 Modifications - Page 3

1202-VLZ PRO Modifications JUMPERS Pre-Fader Mod (Aux To Monitor) This modification changes AUX SEND 2 to be pre-fader, pre-mute instead of post-fader, postmute. ("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 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! 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 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 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 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 JUMPERS JUMPERS JUMPERS CUT CUT CUT CUT CUT CUT Pre-Fader Mod 3