Mackie 406M, Service Manual

Page 1: ...C 6 INSERT INSERT INSERT INSERT INSERT LINE LINE LINE LINE LINE LINE INSERT 15 U O O 1K 500 250 63 125 16K LEVEL 2K 4K 8K MAIN MASTER EFX TO MAIN U O O 10 MASTER OUTPUT SECTION LINE U 12dB O O L R R L...

Page 2: ...2 SERVICE ON THIS EQUIPMENT IS TO BE PERFORMED BY EXPERIENCED REPAIR TECHNICIANS ONLY...

Page 3: ...ormation It is essential that you have a copy of the user s manual as this contains the complete operating instructions SERVICE TECHNICAL ASSISTANCE Mackie Designs Service Technical Assistance is avai...

Page 4: ...50 193 00 MODEL EFFECTS AMPLIFIER MIXER OUTPUT AC POWER 406M 192 204 206 224 225 408M 192 204 205 224 225 408S 192 204 194 224 225 808M 192 193 205 224 252 808S 192 193 194 224 252 Two types of power...

Page 5: ...L EFX MONITOR MAINS TAPE IN TAPE OUT LEVEL MIC 1 MIC 2 MIC 3 MIC 4 MIC 5 MIC 6 INSERT INSERT INSERT INSERT INSERT LINE LINE LINE LINE LINE LINE INSERT 15 U O O 1K 500 250 63 125 16K LEVEL 2K 4K 8K MAI...

Page 6: ...ND MONITOR PHANTOM MAIN EFX MON MAIN EFX EFX TO MONITOR EFX TO MAIN EFX BYPASS EFX CLIP EFX RETURN MIXER LINE OUT AMP ROUTING TAPE IN TAPE OUT L MAINS MAIN MONITOR MONITOR EFX VOLUME MONITOR EFX TRIM...

Page 7: ...TOR PHANTOM L R EFX MON L R EFX EFX TO MONITOR EFX TO MAIN EFX BYPASS EFX CLIP EFX RETURN L EFX SEND LEFT POWER AMP IN LEFT MIXER OUT AMP ROUTING TAPE IN TAPE OUT L STEREO MAINS MAIN MONITOR MONITOR E...

Page 8: ...Bu Maximum Input Levels Mic Input Trim 0 dB HI 20 dBu Trim 40 dB LOW 20 dBu Line Input Trim 0 dB HI 0 dBu Trim 40 dB LOW 40 dBu Insert Input 20 dBu Stereo Line Input 20 dBu Tape Input 20 dBu Effects R...

Page 9: ...ance 10k unbal 20k bal Input Sensitivity 406M 408M 408S 1 35 volts 4 8 dBu for rated power into 4 808M 808S 1 76 volts 7 1 dBu for rated power into 4 Gain Amp In to Speaker Out 26 4 dB 21V V Maximum I...

Page 10: ...for the output transistors from the lower to the upper rail When the peak output voltage gets close to the lower rail voltage the rail quickly switches to the higher supply In a class G design such as...

Page 11: ...R82 As signal level increases the comparator turns on and pin 7 is pulled to within one diode drop of ground via pin 8 and D67 Around 14V is dropped across R82 This voltage drop causes a current to f...

Page 12: ...he FET is still switched off When the output swings more and more positive the divided down signal is presented to U6 10 via R112 D56 and R151 When Pin 10 goes above Pin 9 the switch turns on D69 and...

Page 13: ...below and connect the AC volt meter between the AC power source ground and any exposed metal on the unit under test 2 Connect the mixer under test to an AC power source using a ground lift adaptor le...

Page 14: ...Adjust R7 for 18 to 20mvdc Seal the pot with a drop of nail paint Channel 2 Measure the DC voltage between J21 J22 Adjust R6 for 18 to 20mvdc Seal the pot with a drop of nail paint Power Tests Continu...

Page 15: ...the two pins of J7 Adjust R2 for 19 to 21mvdc Seal the pot with a drop of nail paint Channel 2 Measure the DC voltage between the two pins of J6 Adjust R1 for 19 to 21mvdc Seal the pot with a drop of...

Page 16: ...Encoder S1 Pot R429 LED D10 Pot R463 Pot R433 SW SW5 LED D11 SW SW6 BLOCK DIAGRAMS FRONT PANEL CONTROLS AND ADJUSTMENTS Rotation of the encoder S1 will vary the level of BIT 0 through to BIT 3 This w...

Page 17: ...s the EFX Drive Level pot R429 This shows the effect of the footswitch and EFX Mute BYPASS switch SW5 The FLAG signal goes off to the EFX board DSP IC U2 The FXMUTE signal will mute the EFX analog out...

Page 18: ...signals from the two Parameter pots converts this to digital and sends a combined digital signal to the DSP The DSP and the two SRAM ICs form a powerful DSP system The DSP receives the digital data fr...

Page 19: ...which connects the bottom of each mixer circuit board to the amplfier circuit board AMPLIFIER BOARD CONNECTIONS The power transformer secondary wires connect directly to the amplifier boards using J1...

Page 20: ...20 OUTPUT BOARD The amplifier channel outputs connect to J3 on the output board J3 ORANGE CH2 GREY CH2 BLACK CH1 RED CH1...