Mackie CR1604 Modifications - Page 5

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: This modification also causes the 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). 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 5