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M•1400 / M•1400i / M•1200

SERVICE MANUAL

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1998 MACKIE DESIGNS, INC.

820-179-00

Version 1.2

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Summary of Contents for FR Series M-1200

Page 1: ...M 1400 M 1400i M 1200 SERVICE MANUAL 1998 MACKIE DESIGNS INC 820 179 00 Version 1 2 ...

Page 2: ...ONGATEUR UN PRISE DE COURANT OU UNE AUTRE SORTIE DE COURANT SAUF SI LES LAMES PEUVENT ETRE INSEREES A FOND SANS LAISSER AUCUNE PARTIE A DECOUVERT The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated dangerous voltage within the product s enclosure that may be of sufficient magnitude to constitude a risk of electric sh...

Page 3: ...ROCEDURES 11 REQUIRED EQUIPMENT LIST 11 TROUBLESHOOTING TIPS OUTPUT FAILURES 12 TEST AND BIASING PROCEDURE 13 PARTS 15 QUICK PARTS 15 CHASSIS ASSEMBLY 16 HEATSINK ASSEMBLY 18 COMPLETE PARTS LIST 20 SCHEMATICS PCB LAYOUTS 23 INPUT PCB SCHEMATIC 23 INPUT PCB LAYOUT 24 DISPLAY PCB SCHEMATIC 25 DISPLAY PCB LAYOUT 26 MAIN PCB SCHEMATICS 27 MAIN PCB LAYOUT 30 SOFT START PCB SCHEMATIC 31 SOFT START PCB L...

Page 4: ...ar with op amps discrete analog circuitry and troubleshooting high power solid state amplifiers Presentation of this manual does not constitute endorsement of qualifications by Mackie Designs TECHNICAL SUPPORT Mackie Designs Technical Support Department is available 8AM 5PM PST Monday Friday at 1 800 258 6883 outside US call 011 425 487 4333 Please feel free to call with any questions Better safe ...

Page 5: ... by the M 1400i Export M 1400 s also have a Soft Start circuit that is not installed on American units FAST RECOVERY DESIGN Solid state power amplifiers have a reputation for sounding harsh when driven into clipping The usual explanation is odd harmonics generated by hard clipping but In fact much of the unpleasant sound is caused by latching and parasitic oscillations that occur as the amplifier ...

Page 6: ...ing Area SOA also lights SHORT LED s Heatsink temperature beyond 80 degrees Celsius 4 SHORT The Short LEDs light to show that the amplifier has engaged protection due to a short or low impedance on the output 5 TEMP STATUS The HOT LED lights to indicate that the amplifier has engaged protection due to heatsink temperature or power transformer core temperature 6 POWER SWITCH This remarkable device ...

Page 7: ...n its center position defeats the built in LIMITER for both channels Selecting SUB WOOFER engages the built in low pass filter The FREQUENCY switch selects between 125Hz and 63Hz cutoff for the low pass filter In SUB WOOFER mode inputs 1 and 2 are summed regardless of AMP MODE setting Remember human hearing is unable to discern direction at frequencies where the wavelenth is greater than the dista...

Page 8: ...om 20Hz to 20kHz with no more than 0 025 THD 1260 watts into 4 ohms from 20Hz to 20kHz with no more than 0 050 THD Maximum Power at 1 THD 300 watts per channel into 8 ohms 500 watts per channel into 4 ohms 700 watts per channel into 2 ohms 1000 watts into 8 ohms bridged 1400 watts into 4 ohms bridged Note Power ratings are specified at 120VAC U S and Canada and 240VAC Export line voltages The M 12...

Page 9: ...TORS 6 meter LEDs per channel SIG Signal Present 20 9 6 3 OL Overload CH 1 2 PROTECT LEDs SHORT LEDs TEMP STATUS COLD HOT LEDs POWER CONSUMPTION 65 watts at idle 900 watts with musical program fully loaded 2 ohms per side or 4 ohms bridged 550 watts with musical program fully loaded 4 ohms per side or 8 ohms bridged 850 watts at full power into 8 ohms continuous sine wave 1500 watts at full power ...

Page 10: ...the front end circuitry Channels are muted for 4 seconds on power up as C53 charges via R203 Muting is achieved by turning off Q73 removing current sources for the differential pairs Wait a minute PAIRS Read on An immediately obvious departure from standard designs is the Dual Differentials and Symmetrical Voltage Amps The reasoning behind this front end architecture is actually quite simple Trans...

Page 11: ...witches Q79 and Q78 If SOA detection is tripped the channel is muted by discharging C53 through R200 and D65 fan speed is increased and the SHORT LED lights DC CROWBARS The DC Crowbar circuit protects speakers in the event of an output failure by blowing all rail fuses SCRs Q21 24 are used to short the 80V supply supplies to ground Output signal from both sides is fed through 100K resistors R90 R8...

Page 12: ...d is increased by U6B adding R211 in parallel with R207 Q91 wants it s base a diode drop above ground so Q92 doubles its Emitter voltage U6B is triggered by U4D to increase fan speed if Channel 1 SOA protection is activated U5C OR Channel 2 SOA protection is activated U5D OR The heatsink is above 60 deg C U5B AND program is detected U4C OR The heatsink temperature is above 80 deg C U5A U6C and Q89...

Page 13: ...crews can arc to the capacitor body Be sure all tywraps are replaced and that no wires are in danger of being pinched in between the cover and heatsink REQUIRED EQUIPMENT LIST 30 MHz dual trace oscilloscope DMM Must be capable of measuring 8mV DC with a minimum of 2 digits of accuracy and down to 1Ω Sine wave oscillator Function generator 20Hz 20KHz 4 load resistors 8Ω with a minimum 500W power ra...

Page 14: ... pre drivers are not shorted If one driver is shorted replace it s mate Do the same with the pre drivers Also check all the resistors surrounding the drivers and pre drivers Check the VI limiters and detectors It is not uncommon to damage these parts when the amplifier fails in a spectacular way Look for shorts on Q76 Q77 Q94 Q95 Q83 Q84 Q96 and Q97 Verify proper value on the resistors that go to ...

Page 15: ...e output will clip somewhere between 120V 140V pk pk depending on how stiff the line is Clipping should be as described above Add the 0 1uF capacitive loading and verify clipping is still well behaved 6 Individually load Channel 1 and Channel 2 with 2Ω Clipping should be symmetrical well behaved and occur somewhere around 80V 100V pk pk Verify that clipping is well behaved after adding the 0 1uF c...

Page 16: ...M 1200 M 1400 SERVICE MANUAL SERVICE PROCEDURES 14 THIS PAGE UNINTENTIONALLY LEFT BLANK THOSE RESPONSIBLE HAVE BEEN PUT TO THE SWORD ...

Page 17: ...z O FF S TA GE M ON IT OR 1 00H z S T A GE M ON IT OR O FF T YP IC AL O N O FF T YP IC AL T YPIC AL 35Hz T YPIC AL 35Hz MONOB RI DG E 1200W A T T S 4OHMLOADMI N 600W A T TSC H 2O HM SLO ADM IN S TE RE O T YP IC AL S T E RE O T YP IC AL A IRE Q A IRE Q GAIN CONTROLS 5KL POT 130 036 00 KNOB 760 061 00 NUT 705 013 00 STAR WASHER 710 023 00 POWER SWITCH 500 022 00 ALL LEDS RED T 1 304 001 00 GREEN T 1...

Page 18: ...M 1200 M 1400 SERVICE MANUAL PARTS 16 CHASSIS ASSEMBLY 4 5 8 1 2 3 6 1 7 1 11 9 10 12 13 15 16 17 18 14 ...

Page 19: ...MR M1200 230V 600 016 02 XFMR M1200 100V 705 019 00 NUT HEX 5 16 18 710 017 00 WASH SPLTLCK 5 16 HEAVY 710 024 00 WASH FLAT 5 16 HARD USS 550 249 00 PLATE XFMR MTG M1200 780 111 00 RUBBER PAD 700 059 00 HEX 5 16 18X3IN GD 5 13 550 247 00 SHIELD INPUT M1200 14 780 042 00 INSUL MYLAR INPUT SHIELD 15 055 079 00 PCB ASSY INPUT 1200 1400 16 700 028 02 SEMS 6 32X3 8 PHP BLKZC INPUT PCB TO SHIELD 17 760 ...

Page 20: ...M 1200 M 1400 SERVICE MANUAL PARTS 18 HEATSINK ASSEMBLY ...

Page 21: ...UBSINK M1200 9 410 003 00 INSL SILPAD K6 W ADHESIVE 11 700 010 00 TF 6 32X1 4 PHP BLKZC 12 710 013 00 WASH FLAT NO 6 FIBRE 13 700 010 04 TF 6 32X3 8 PHP BLKZC 14 550 237 00 SPRING CLIP SUBSINK M1200 15 700 028 02 SEMS 6 32X3 8 PHP BLKZC 16 550 225 00 HEATSINK COWLING M1200 17 700 010 00 TF 6 32X1 4 PHP BLKZC 18 770 006 00 FAN 80MM 24VDC MECHATRONI 18 770 007 00 FAN 80MM 24VDC PANASONIC 19 550 219 ...

Page 22: ... 5 13K OHM 100 080 00 RES CF 125W 5 20K OHM 100 082 00 RES CF 125W 5 24K OHM 100 083 00 RES CF 125W 5 27K OHM 100 084 00 RES CF 125W 5 30K OHM 100 086 00 RES CF 125W 5 36K OHM 100 089 00 RES CF 125W 5 47K OHM 100 092 00 RES CF 125W 5 62K OHM 100 093 00 RES CF 125W 5 68K OHM PART DESCRIPTION 100 094 00 RES CF 125W 5 75K OHM 100 097 00 RES CF 125W 5 100K OHM 100 109 00 RES CF 125W 5 1M OHM 100 110 0...

Page 23: ...034 00 LYT 47UF 20 100V RAD 220 035 00 LYT 12000UF 20 80V RAD 220 039 00 LYT 1000 20 25V RAD SMDIA 220 040 00 LYT 10UF 20 160V RAD 300 001 00 DIO SIG 1N4148 100V 500MW PART DESCRIPTION 300 003 00 DIO SW DL4148 100V SM 300 007 00 DIO SW 1SS244 SUB 1SS245 301 006 00 THY 2N6507 400V 301 007 00 DIO PWR DUAL FEP30 D7 301 008 00 DIO PWR DUAL FEN30 D8 301 009 00 DIO PWR 1N4004 301 010 00 DIO PWR 1N5404 3...

Page 24: ...X1 4 PHP BLKZC 700 010 04 TF 6 32X3 8 PHP BLKZC 700 011 00 MCH 4 40X1 4 BTNSKT BLKOX 700 028 02 SEMS 6 32X3 8 PHP BLKZC 700 028 04 SEMS 6 32X3 4 PHP BLKZC 700 041 04 MCH 6 32X3 8 FL 100DG BLK 700 047 04 MCH 10 32X3 8 FIL PHL CLR 700 050 04 MCH 6 32X3 8 FIL PHL CLR 700 055 00 MCH 4 24X3 8 PHP BLK HILO PART DESCRIPTION 700 058 02 MCH 4 40X1 2 SKT CLRZC 700 059 00 HEX 5 16 18X3IN GD 5 704 001 01 PEMN...

Page 25: ...ive 4 28 97 M1400 prior to SN AH12657 Problem Original fuse 15A rated too low Turn on inrush current causes fuse to open Solution Replace the main F1 fuse with a 20A 250V slow blow fuse Attention Since you will be working directly with the AC power line great care should be taken in all aspects of the installation Power should be disconnected from the unit prior to the installation process Top Vie...

Page 26: ... 1400 Serial AFXXXXX to AFXXXXX Effective 5 8 97 Problem The primary and secondary wires get pinched between the top cover and the fan shroud Solution Install a 7 tywrap through the fan shroud tunnels 740 016 00 15 1 16 tywrap cut to 7 Transformer secondary wires Transformer primary wires Top View 7 tywarp 15 1 16 7 7 Fan Tywrap Front View Top View ...

Page 27: ... personnel Tools Required Phillips screwdriver Torx and Allen drivers needle nose pliers safety glasses Parts Required 040 359 00 Ribbon cable 28GA 20 Pin Length 4 25 PLZD Quantity 1 040 360 00 Ribbon cable 28GA 20 Pin Length 18 PLZD Quantity 1 400 077 00 20 Pin Headers Quantity 2 Procedure 1 Remove all cords including the power cable and speaker outputs from the amplifier 2 Take off the top cover...

Page 28: ...ribbon cable Discard part 040 062 02 18 inch ribbon cable You may have to undo the display board screws in order to remove it from J1 13 Add part 040 359 00 4 25 inch ribbon cable to J11 Add part 040 360 00 18 inch ribbon cable to J16 Align each cable s color stripe with the header s pin 1 Make sure both ribbons are fully inserted 14 Refit the display board once the long ribbon cable is securely a...

Page 29: ...M 1200 M 1400 INPUT PCB 055 079 00 REV D 23 ...

Page 30: ...M 1200 M 1400 INPUT PCB 055 079 00 REV D 24 ...

Page 31: ...M 1200 M 1400 DISPLAY PCB 055 080 00 REV A 25 ...

Page 32: ...M 1200 M 1400 DISPLAY PCB 055 080 00 REV A 26 ...

Page 33: ...M 1200 M 1400 MAIN PCB 055 081 00 REV D 27 ...

Page 34: ...M 1200 M 1400 MAIN PCB 055 081 00 REV D 28 ...

Page 35: ...M 1200 M 1400 MAIN PCB 055 081 00 REV D 29 ...

Page 36: ...M 1200 M 1400 MAIN PCB 055 081 00 REV D 30 ...

Page 37: ...M 1200 M 1400 SOFT START PCB 055 162 00 REV A 31 ...

Page 38: ...M 1200 M 1400 SOFT START PCB 055 162 00 REV A 32 ...

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