User manual MACKIE I604-VLZ PRO MODIFICATIONS

[. . . ] To avoid electric shock, do not perform any servicing other than changing the fuse unless you are qualified to do so. Refer all servicing and modifying to qualified personnel. Holes AFTER Solder Mackie Disclaimer Any modification of any Mackie product must be performed by a competent electronic technician. LOUD Technologies accepts no responsibility for any damages or injuries caused by any modification, regardless of the source of the modification instructions or the qualifications of the technician performing them. In the case of such damages, LOUD Technologies may declare warranty privileges void. [. . . ] Add a jumper from point `YL' to the square pad at point `XL' and from point `YR' to the square pad at point `XR'. Check your work very carefully, then put the bottom cover back the way you found it. 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. 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. 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). This could be especially handy for live work where the engineer wants to be able to control 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 not 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). [. . . ] For example, if you have a 24·8, the modification must be done on all 24 input channels. This modification takes place on each channel strip in an area under Mix-B Source switch. Repeat for all input channels. BEFORE cut here (G) BEFORE cut here (G) AFTER AFTER add jumper (H) add jumper (H) Mix-B Source Modification 12 Mix-B Mute Modification BEFORE (K) AFTER (K) add jumper (B) (L) cut here (A) (L) (AUX SEND 1&2) PRE SWITCH (Q) add jumper (D) (Q) (P) (P) (AUX SEND 3&4/5/6) PRE SWITCH The infamous and dreaded but-if-we-hadn't-included-it -we'd-just-have-to-fax-it-to-the-foolhardy-anyway modification AUX 1/2 Source Mod This modification should only be performed if the console is being used strictly for recording. When the Aux 1/2 Pre Switch is engaged, Aux Send 1 and 2 will tap the Pre-Fader information from the tape returns. B. [. . . ]