User manual MACKIE I604-VLZ PRO MODIFICATIONS

[. . . ] Mackie Compact Mixers Modifications 1 Mackie Compact Mixers Modifications 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. [. . . ] You're done! JUMPERS HERE CUT HERE 5 1402-VLZ PRO Modifications Pre-Fader Mod (Aux To Monitor) This modification changes AUX SEND 2 to be pre-fader, pre-mute instead of post-fader, postmute. ("Mute" refers to the channel's MUTE/ ALT 3­4 switch. ) In order to convert the entire mixer, it must be done on each channel, and is slightly more involved for the stereo channels 7­14. The work area is on the underside of the circuit board, near the channel AUX SEND knobs. Remove all cords, including the power cable, from the 1402-VLZ PRO. Place the mixer upside-down on a dry, non-marring surface. Remove the screws that attach the bottom cover. Using a sharp "X-acto" type knife, cut the conductor at point `A' (channels 1­6) or the conductors at points `AL' and `AR' (channels 7­14). Be careful to cut all the way through the conductor, and do not cut any nearby traces. Add a jumper from point `B' to the square pad at point `A' (channels 1­6) or from points `BL' to `AL' and `BR' to `AR' (channels 7­14). Check your work very carefully, then put the bottom cover back the way you found it. You're done! Channels 1-6 JUMPERS HERE 5 JUMPERS HERE 5 JUMPERS HERE 5 CUT HERE 4 JUMPERS HERE CUT HERE 4 CUT HERE 4 Channels 7-14 5 JUMPERS HERE CUT HERE 4 6 CUT HERE CUT HERE 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. In order to convert the entire mixer, it must be done on each channel, and is slightly more involved for the stereo channels 7­14. The work area is on the underside of the circuit board, near the channel MUTE/ALT 3­4 switches. Remove all cords, including the power cable, from the 1402-VLZ PRO. Place the mixer upside-down on a dry, non-marring surface. Remove the screws that attach the bottom cover. Using a sharp "X-acto" type knife, cut the conductor at point `C' (channels 1­6) or the conductors at points `CL' and `CR' (channels 7­14). Be careful to cut all the way through the conductor, and do not cut any nearby traces. Locate the 12 pins that comprise the underside of each MUTE/ALT 3­4 switch. Add jumpers as shown on the illustration below--they're not specifically marked on the circuit board itself, so be careful. Check your work very carefully, then put the bottom cover back the way you found it. You're done! Channels 1-6 JUMPERS HERE 6 JUMPERS HERE 6 JUMPERS HERE 6 CUT HERE 4 CUT HERE 4 CUT HERE 4 Channels 7-14 JUMPERS JUMPERS 6 HERE HERE 6 CUT HERE 4 7 CUT HERE 4 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). [. . . ] You're done! Channel 16 Channel 15 CUT HERE 5 JUMPERS HERE 6 9 1604-VLZ PRO Source Mod This changes the CTL ROOM/PHONES level control in the SOURCE matrix to receive the main mix stereo signal pre-MAIN MIX fader instead of post-MAIN MIX fader. You can accomplish the same result that this modification provides by using two standard 1 /4" tip-sleeve "jumper cables" plugged into the MAIN INSERT (L and R) to the first click and the other end plugged into STEREO AUX RETURN 4, assigned to C-R/PHNS ONLY. STEREO AUX RETURN 4 level will control the volume as well as CTL ROOM/ PHONES level control. You can also use the TAPE INPUT (L and R) RCA jacks (you will need 1/4" to RCA cables or adapters) and assign the TAPE source button in the SOURCE matrix. [. . . ]