Mackie M1400/M1400i Owner's Manual - Page 30

BLOCK DIAGRAM M•1400/ M•1400i 30 CH 1 BALANCED LINE INPUT (XLR-F) THRU (XLR-M) CH 1 BALANCED LINE INPUT (TRS) CH 2 BALANCED LINE INPUT (XLR-F) THRU (XLR-M) CH 2 BALANCED LINE INPUT (TRS) MACKIE DESIGNS M•1400 BLOCK DIAGRAM (#022598DF) FREQ FREQ SIG (TO CH 1 METER DRIVE) LOW CUT FILTER CD EQ ON OFF FREQ FREQ 63 Hz FREQ 125 Hz LOW PASS FILTER (SUBWOOFER) LOW CUT FILTER CD EQ ON OFF SIG (TO CH 2 METER DRIVE) FUSE POWER SWITCH TOROIDAL POWER TRANSFORMER LAMP TO CH 1 AND CH 2 MUTE THERMAL PROTECT PD's LEASH + 80 VDC - OUTPUT APPLICATION ON SWITCH OFF SUB TO LIMITER NC NC ON OFF SUB + 90 VDC - TEMP SENSOR (ON HEATSINK) CH 1 GAIN INVERTING UNITY GAIN AMPLIFIER STEREO MONO NC BRIDGE AMP MODE SWITCH LIMITER CH 2 GAIN LIMITER CH 1 PROTECT LED TO CH 1 MUTE FUSE +80VDC CH 1 SHORT LED SHORT DETECT DC OFFSET DETECT MUTE CH 1 MUTE CH 2 PROTECT LED POWER AMPLIFIER FUSE -80VDC TO CH 2 MUTE FUSE +80VDC CH 2 SHORT LED SHORT DETECT DC OFFSET DETECT MUTE POWER AMPLIFIER 60ºC DETECTOR CH 2 MUTE FUSE -80VDC AND CH 1 AMP OUT CH 2 AMP OUT PROGRAM DETECT FAN SPEED CONTROL FAN OR HI DCV FROM CH 1 HOT SHORT DETECT LED 80ºC MUTE 55ºC UNMUTE COLD LED FROM CH 2 SHORT DETECT CH 1 MUTE CONTROL 4 SEC DELAY (TURN-ON) CH 2 MUTE CONTROL TO CH 1 MUTE LO DCV TO CH 2 MUTE METER DRIVE CH 1 SIG OL -3 -6 -9 -20 SIG CH 1 SPEAKER OUT METER DRIVE CH 2 SIG OL -3 -6 -9 -20 SIG CH 2 SPEAKER OUT TO HUSKY STADIUM