IMPORTANT NOTICE This manual has been provided for the use of authorized Yamaha Retailers and their service personnel. It has been assumed that basic service procedures inherent to the industry, and more specifically Yamaha Products, are already known and understood by the users, and have therefore not been restated.
EMX512SC/EMX312SC ■ SPECIFICATIONS • General Specifications Output Conditioins U, V H, B, W, K, O UNIT 4 Ω Maximum Output Power SPEAKERS OUT EMX512SC Both ch drive, 1 kHz, 8 Ω THD+N ≤ 0.5% 4 Ω EMX312SC 8 Ω Input...
Connector Impedance Normal Norminal Max. before Clip 0.1 Ω 4 Ω Speakers SPEAKERS EMX512SC 125 W 500 W [A1, B1] SPEAKON [A1, A2, B1, B2] EMX312SC 75 W 300 W [A2, B2] Phone Jack 600 Ω MAIN OUT [L, R] 10 kΩ...
EMX512SC/EMX312SC ■ PANEL LAYOUT • Controls on Each channel • Digital Effect Section 1 FCL (Feedback Channel Locating) indicator 0 PROGRAM selector 2 Equalizer gain control (HIGH, MID, and LOW) q PARAMETER control 3 MONITOR control w DIGITAL EFFECT ON switch...
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EMX512SC/EMX312SC • MAIN Section MAIN • MONITOR Section MONITOR t Graphic Equalizer faders a Graphic Equalizer faders y EFFECT RETURN control s EFFECT RETURN control u MASTER control d MASTER control i LEVEL meters f LEVEL meters o MAIN OUT L and R jacks...
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EMX512SC/EMX312SC • POWER Section POWER h PHANTOM switch j LIMITER indicators k POWER AMP switch l YS Processing switch ; STAND-BY switch z POWER switch and indicator h PHANTOM ス イ ッ チ j LIMITER イ ン ジケー タ ー...
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EMX512SC/EMX312SC ■ DISASSEMBLY PROCEDURES ■ • Preparing 準備 • A screwdriver with a long shaft is required to remove some 一部のネジの取 り 外 し には、 軸が長い ド ラ イ バーが必 screws. 要です。 220 mm or more Front Panel Unit フ ロ ン ト パネルユニ ッ ト...
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EMX512SC/EMX312SC JACK, DSP and MIX Circuit Boards JACK シー ト 、 DSP シー ト 、 MIX シー ト 1 Remove the front panel unit. (See procedure 1.) 1 フ ロ ン ト パネルユニ ッ ト を外 し ます。 (1 項参照)...
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Connector Color of Wire Connected to CN401 GRAY OUT Circuit Board CN402 BROWN OUT Circuit Board CN404 CN405 PA Circuit Board (EMX512SC only) CN406 ORANGE PA Circuit Board CN407 BLACK OUT Circuit Board CN408 BLUE PA Circuit Board CN409 WHITE...
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EMX512SC/EMX312SC Rear Panel Unit リ アパネルユニ ッ ト (所要時間 : 約 5 分) (Time required: about 5 minutes) フ ロ ン ト パネルユニ ッ ト を外 し ます。 (1 項参照 ) PS シー ト を外 し ます。 (5 項参照 ) Remove the front panel unit.
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EMX512SC/EMX312SC [185] CN303 CN301 CN302 Photo.6 (写真 6) [185]: Bind Head Screw 4x8 MFZN2W3 (WF106500) 小ネジ+ BIND Photo.7 (写真 7) パワーア ン プユニ ッ ト Power Amplifier Unit (所要時間 : 約 10 分) (Time required: about 10 minutes) リ アパネルユニ ッ ト を外 し ます。 (7 項参照 ) Remove the rear panel unit.
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Remove the fourteen (14) screws marked [50a]. (Fig.7) 場合は [60a] のネジ 4 本を外 し 、 PA シー ト を外 し ます。 10-5 Remove the twelve (12) screws (for EMX512SC) or four (4) ( 図 7) screws (for EMX312SC) marked [60a]. The PA circuit board then can be removed.
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EMX512SC/EMX312SC • DSP Circuit Board N.C. Component side to MIX-CN301 Pattern side 2NA-WD80120...
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EMX512SC/EMX312SC • JACK Circuit Board to MIX-CN001 to MIX-CN002 COMP LINE/MIC INPUT A INPUT B A’ Component side 2NA-WD94340...
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EMX512SC/EMX312SC to MIX-CN101 to MIX-CN102 to MIX-CN201 to MIX-CN202 (MONO) LINE LINE 9/10 11/12 A’ B’ Component side 2NA-WD94340...
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EMX512SC/EMX312SC to MIX-CN302 to MIX-CN402 L (MONO) MAIN FOOT SW EFFECT OUT REC OUT B’ Component side 2NA-WD94340...
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EMX512SC/EMX312SC • JACK Circuit Board C’ Pattern side 2NA-WD94340...
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EMX512SC/EMX312SC C’ D’ Pattern side 2NA-WD94340...
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EMX512SC/EMX312SC D’ Pattern side 2NA-WD94340...
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EMX512SC/EMX312SC • MIX Circuit Board from JACK-CN001 from JACK-CN002 E’ Component side 2NA-WD94320...
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EMX512SC/EMX312SC to DSP-CNM02 9/10 11/12 PROGRAM PARAMETER from JACK-CN102 from JACK-CN101 from JACK-CN201 from JACK-CN202 E’ from PS-CN416 F’ Component side 2NA-WD94320...
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EMX512SC/EMX312SC PHANTOM GEQ Fader (MONITOR) Level Meter (MONITOR) LIMITER EFFECT RETURN (MONITOR) MASTER (MONITOR) POWER AMP GEQ Fader (MAIN) Level Meter (MAIN) YS Processing MASTER EFFECT RETURN (MAIN) (MAIN) STAND-BY POWER from JACK-CN402 from JACK-CN401 F’ Component side 2NA-WD94320...
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EMX512SC/EMX312SC • MIX Circuit Board G’ Insert pins from JACK-CN401 Pattern side Pattern side Insert pins from JACK-CN402 2NA-WD94320...
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EMX512SC/EMX312SC H’ Pattern side G’ Insert pins from DSP-CNM02 Insert pins from JACK-CN202 Insert pins from JACK-CN201 Insert pins from JACK-CN102 Insert pins from JACK-CN101 2NA-WD94320...
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EMX512SC/EMX312SC Pattern side Insert pins from JACK-CN002 Insert pins from JACK-CN001 H’ 2NA-WD94320...
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EMX512SC/EMX312SC • OUT Circuit Board SPEAKERS from PA-W103 from PA-W101 to PS-CN407 from PA-W102 I’ Component side 2NA-WE83470...
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EMX512SC/EMX312SC AC IN to PS-CN402 to PS-CN401 I’ Component side 2NA-WE83470...
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EMX512SC/EMX312SC • PA Circuit Board (EMX512SC: PA88, EMX312SC: PA86) to PS-CN405 (EMX512SC only) IDLING ADJ. B to OUT-CN302 to PS-CN406 N.C. from PS-CN415 J’ MAX. POWER ADJ. B Component side 2NA-WE74050...
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EMX512SC/EMX312SC to OUT-CN303 to PS-CN409 IDLING ADJ. A (EMX512SC only) to PS-CN408 N.C. J’ to OUT-CN301 MAX. POWER ADJ. A Component side 2NA-WE74050...
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EMX512SC/EMX312SC • PA Circuit Board K’ Pattern side 2NA-WE74050...
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EMX512SC/EMX312SC K’ Pattern side 2NA-WE74050...
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EMX512SC/EMX312SC • PS Circuit Board (EMX512SC: PS88, EMX312SC: PS86) from OUT-W304 from OUT-W303 from SW-W602 from SW-W601 L’ Component side 2NA-WD94830...
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EMX512SC/EMX312SC from PA-W105 from PA-W104 (EMX512SC only) (EMX512SC only) from PA-W106 from OUT-W305 from PA-W107 from FAN L’ from PA-CN101 to MIX-CN401 Component side 2NA-WD94830...
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EMX512SC/EMX312SC ■ INSPECTION Measurement Conditions Environment • Normal temperature: 5 to 40 degree • Normal humidity: 30 to 90 % Power Source The voltage is within ±10 % • U,V: 120 V • H, W: 230 V • B: 230 V •...
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EMX512SC/EMX312SC Indicator Inspection Check the POWER indicator and DIGITAL EFFECT ON indicator light up when the unit is turned on. Also check that the fan is rotating at a low speed. Gain With controls set as specified in the section 2-1, check the output levels are in the range specified in the table 2-3-1 and 2-3-2.
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EMX512SC/EMX312SC FCL indicator light-up level With controls set as specified in the section 2-1, check the FCL indicator lights up when the 1 kHz, –73 dBu signal is input to the input terminal (INPUT B, MIC) of channels 1-11/12. Also check the FCL indicator turns off when the –85 dBu signal is input.
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EMX512SC/EMX312SC 2-15 STAND-BY With controls set as specified in the section 2-1, input signal from INPUT B of channel 1 and set each output level of MAIN OUT (L, R), MONITOR OUT and EFFECT OUT to +14 dBu. Then turn on the STAND-BY switch and check the output level is –46 dBu or less and the STAND-BY indicator lights up.
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EMX512SC/EMX312SC Notes: • Attack time: restoration time (at 90 %) after changing the input level from –42 dBu to –32 dBu. (Fig. 2-16-5) • Release time: restoration time (at 90 %) after changing the input level from –32 dBu to –42 dBu. (Fig. 2-16-5)
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EMX312SC 40±10 W 3-7-1 Preparation • Input the 1 kHz, –10 dBu signal. • Adjust the MONITOR MASTER control so that the output terminal voltage of the SPEAKERS B2 terminal is +22±0.1 dBu. • Adjust the MAIN MASTER control so that the output terminal voltage of the SPEAKERS A2 terminal is +22±0.1 dBu.
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EMX512SC/EMX312SC Stability 3-8-1 Preparation • Disconnect the load resistance from the output terminal. • Input the 1 kHz, –10 dBu square wave. (effective value) • Adjust the MONITOR MASTER control so that the output terminal voltage of the SPEAKERS B2 terminal is within the range specified in the table 3-8-1.
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EMX512SC/EMX312SC 3-10 Factory Settings • Equalizer gain control (HIGH, MID, LOW): Center (0) • Graphic equalizer fader (7-band): Center (0) • POWER AMP switch: MAIN L/R • YS Processing switch: • PROGRAM selector: 1 (REVERB HALL 1) • Other VR controls: Minimum •...
• Between the positive (+) and negative (–) terminals of C409 and C410. If you have left the unit for 10 minutes or more after turning the power off, you do not have to discharge. • Between CN406 and CN408. If you handle the EMX512SC model, also discharge electricity between CN405 and CN409.
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EMX512SC/EMX312SC Example of Repair All DC voltage is not output from secondary side. Instruction Follow the instruction below. (See section 3-2 and diagram 3-3 on page 86.) 1 Check the resistor value of R418 and R424 (6.8 Ω, 5 W).
(Disconnect AC plug from the wall outlet.) Discharge (*1) Between ± terminals of C409 and C410 Between CN406 and CN408 Between CN405 and CN409 (EMX512SC) Check R418 and R424 resistor value. R418, R424 = 6.8 Ω? Replace R418 and R424.
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EMX512SC/EMX312SC Check F401 resistor value F401 resistor value (OPEN) Replace F401. OPEN? Check IC402 resistor value (*2) Pin 4-5 Replace IC402. Resistor value = approx. 10 k ? Pin 4-3 Replace IC403. Resistor value = approx. 5.5 k ? Replace IC401 if the problem is not resolved.
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EMX512SC/EMX312SC Turn the power on. Check the waveform. Note: Do not short-circuit the oscilloscope chassis with the chassis of this unit when checking the waveform. Check the waveform between pin 4-5 (GND-LVG) of IC402 Check the rectangular wave. Period: approx. 14 µS (approx. 70kHz) 13.9 µS...
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EMX512SC/EMX312SC Waveform check OK? IC403 output = +15 V? Check and replace parts on the primary side. Replace IC402. If IC402 has been replaced, replace IC401.
EMX512SC/EMX312SC POWERED MIXER PARTS LIST ■ CONTENTS OVERALL ASSEMBLY (総組立).......................2 REAR PANEL ASSEMBLY ( リ アパネル Ass’y) ................6 POWER AMPLIFIER UNIT (パワーア ン プユニ ッ ト ) ..............7 HEAT SINK UNIT L100 ( ヒ ー ト シ ン ク ユニ ッ ト L100)..............9 HEAT SINK UNIT L70 (...
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M11 Hexagonal Nut: Accessories of Phone Jack Rack Mount Kit (Option) (See page 40) View A For details, see page 3 “OVERALL ASSEMBLY 2/2” Rear Panel Assembly (See page 6) Ass’y Power Amplifier Unit (See page 7) View A Heat Sink Unit L100 (See page 9) L100 Circuit board OUT Heat Sink Unit L50...
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• Back View M9 Hexagonal Nut & Washer: Accessories of Phone Jack &...
+20~–4dBu Normal Phase Normal VR015 VR014 VR013 JK002,004,006,008 0~9dB Q304 Phase PUSH LINE Reverse Phase VR021 VR020 VR019 * EMX512SC (–30dB) Input: Reverse Phase VR004,010, IC301-2/2 JK401 with LPF EQ Variation width: +/–15dB 016,022 VR416 W104 W106 W107 W105 MASTER...
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■ DSP CIRCUIT DIAGRAM (EMX512SC/EMX312SC) EMX512SC/EMX312SC SYSTEM RESET MASK ROM 8M ) : Ceramic Capacitor ( ) : Myler Capacitor ( (D) : Metal Film Resistor N.C. Not installed OP AMP OP AMP OP AMP to MIX-CN301 (Page10:J5) OP AMP Note: See parts list for details of circuit board component parts.
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■ JACK CIRCUIT DIAGRAM 1 (EMX512SC/EMX312SC) EMX512SC/EMX312SC COMP (CH1) OP AMP OP AMP OP AMP CH1 IN to MIX-CN001 (Page7:H7) LINE/MIC (CH1) OP AMP COMP (CH2) OP AMP to MIX-CN402 OP AMP (Page11:G9) OP AMP CH2 IN LINE/MIC (CH2) OP AMP...
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■ JACK CIRCUIT DIAGRAM 2 (EMX512SC/EMX312SC) EMX512SC/EMX312SC OP AMP OP AMP CH5/6 IN CH9/10 IN OP AMP OP AMP to MIX-CN101 to MIX-CN201 (Page8:J2) (Page9:J2) OP AMP OP AMP OP AMP to MIX-CN202 (Page9:J6) OP AMP CH11/12 IN OP AMP...
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■ MIX CIRCUIT DIAGRAM 1 (EMX512SC/EMX312SC) EMX512SC/EMX312SC OP AMP OP AMP OP AMP OP AMP OP AMP OP AMP OP AMP OP AMP OP AMP OP AMP OP AMP OP AMP to JACK-CN001 to JACK-CN002 (Page5:F3) (Page5:F8) ) : Ceramic Capacitor (...
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■ MIX CIRCUIT DIAGRAM 2 (EMX512SC/EMX312SC) EMX512SC/EMX312SC OP AMP OP AMP to JACK-CN101 OP AMP (Page6:G3) OP AMP OP AMP ) : Ceramic Capacitor ( ) : Myler Capacitor ( OP AMP OP AMP to JACK-CN102 OP AMP (Page6:G7) OP AMP OP AMP Note: See parts list for details of circuit board component parts.
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■ MIX CIRCUIT DIAGRAM 3 (EMX512SC/EMX312SC) EMX512SC/EMX312SC OP AMP OP AMP OP AMP to JACK-CN201 (Page6:B3) CH10 OP AMP OP AMP Note: See parts list for details of circuit board component parts. Note: Nonpolar capacitors without indications are ceramic capacitors.
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■ MIX CIRCUIT DIAGRAM 4 (EMX512SC/EMX312SC) EMX512SC/EMX312SC OP AMP OP AMP OP AMP OP AMP OP AMP CN301 OP AMP OP AMP to DSP-CNM02 (Page4:O9) OP AMP to JACK-CN402 (Page5:D8) OP AMP OP AMP OP AMP Note: See parts list for details of circuit board component parts.
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■ MIX CIRCUIT DIAGRAM 5 (EMX512SC/EMX312SC) EMX512SC/EMX312SC LED DRIVER OP AMP OP AMP OP AMP LED DRIVER OP AMP OP AMP OP AMP OP AMP OP AMP OP AMP OP AMP OP AMP LED DRIVER OP AMP OP AMP OP AMP Note: See parts list for details of circuit board component parts.
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■ OUT CIRCUIT DIAGRAM (EMX512SC/EMX312SC) EMX512SC/EMX312SC to PA-W102 (Page13:F1) J/H/B/WT SPEAKERS to PA-W101 U/VT/A/K/O (Page13:F12) to PS-CN401 (Page14:P2) AC IN to PA-W103 (Page13:A3) to PS-CN402 (Page14:P3) to PS-CN407 (Page14:A3) 28CC1-2000002028 : Capacitor Ceramic Capacitor ( Metal Oxide Film Resistor Flame Proof C. Resistor ( U/V/A/K/O Note: See parts list for details of circuit board component parts.
■ PA CIRCUIT DIAGRAM (EMX512SC/EMX312SC) EMX512SC/EMX312SC to OUT-CN301 (Page12:C1) to PS-CN405 (Page14:A2) to PS-CN406 (Page14:A3) OP AMP COMPARATOR IDLING ADJ. A to OUT-CN303 (Page12:C4) MAX POWER ADJ. A COMPARATOR CN101 to PS-CN408 (Page14:A3) to PS-CN415 (Page14:A6) N.C. to PS-CN409...
■ PS & SW CIRCUIT DIAGRAM (EMX512SC/EMX312SC) EMX512SC/EMX312SC Note: See parts list for details of circuit board component parts. Note: Nonpolar capacitors without indications are ceramic capacitors. W601 W602 to OUT-W303 to PA-W104 POWER (Page12:D3) (Page13:A1) TRANSFORMER to PA-W106...