Yamaha MS400 Service Manual

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Owner's manual (24 pages)

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Page 1 MS400 3 7 63 1515 0 POWERED SPEAKER MS400 SERVICE MANUAL L 13942296513 CONTENTS SPECIFICATIONS ........... 3 DIMENSIONS ............4 BLOCK DIAGRAM ......4 PANEL LAYOUT ........5 CIRCUIT BOARD LAYOUT ....6 WIRING ..............7 DISASSEMBLY PROCEDURE ......8 IC BLOCK DIAGRAM ........
Page 2: Http://Www.xiaoyu163.Com
IMPOR TANT 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 under- stood by the users, and have therefore not been restated.
Page 3: Specifications
MS400 3 7 63 1515 0 SPECIFICATIONS General speciﬁcations Controls LEVEL ....LINE, MIC , MASTER Type EQ ....LOW: 0 (Max.) ~ -10 dB (Min.) at 55 Hz Bi-Amp 2-way bass reflex powered speaker HIGH: ±3 dB (HF) (Bi-amp lifier electronic crossover network)) Power switch ......
Page 4: Block Diagram
MS400 3 7 63 1515 0 DIMENSIONS Remove the cover when you use optional brackets Units: mm L 13942296513 BLOCK DIAGRAM CN203-3(LF-), Mic Input CN203-4(LF+) LOW CUT IC105 P.AMP IC102 Master CN101-6 CN103-6 CN102-6 CN201-6 VR101 VR104 IC104 IC106...
Page 5 MS400 3 7 63 1515 0 PANEL LAYOUT Rear Panel TONE CONTROL HIGH LEVEL LEVEL LEVEL L 13942296513 POWER switch AC IN connector LINE connectors LINE LEVEL control MIC connector MIC control MASTER LEVEL control POWER indicator TONE CONTROL u163 http://www.xiaoyu163.com...
Page 6 MS400 3 7 63 1515 0 CIRCUIT BOARD LAYOUT L 13942296513 u163 http://www.xiaoyu163.com...
Page 7 MS400 3 7 63 1515 0 WIRING Speakers CN203 CN202 CN201 L 13942296513 H only CN103 Transformer Coil CN102 CN208 CN205 CN204 CN101 AC.IN P.SW u163 http://www.xiaoyu163.com...
Page 8: Disassembly Procedure
MS400 3 7 63 1515 0 DISASSEMBLY PROCEDURE Amplifier assembly 1-1. Remove the sixteen (16) screws marked [180A]. The amplifier assembly can then be removed. (Fig. 1) Cabinet assembly and buffle assembly 2-1. Remove the nineteen (19) screws marked [170]. The buffle assembly can then be removed from the capinet assembly.
Page 9: Table Of Contents
MS400 3 7 63 1515 0 AMP Circuit Boards (1/5 to 5/5) 4-1. Remove the amplifier assembly. (See Procedure 1.) 4-2. Remove the screws and the knob from each circuit board, which can then be removed. (Fig. 2) PCB Name Ref No.
Page 10: Remove The Amplifier Assembly. (See Procedure
MS400 3 7 63 1515 0 Handle 6-1. Remove the cabinet assembly. (See Procedure 2.) 6-2. Remove the two (2) screws marked [70] and the two (2) nuts marked [80]. The handle can then be removed. (Fig.3) Heat sink 7-1.
Page 11: Amp1/5
MS400 3 7 63 1515 0 CIRCUIT BOARDS AMP1/5 Circuit Board to AMP5/5 -CN103 CN203: L 13942296513 to SPEAKER Transformer Component side u163 Notes: VR201, VR202: Idling Adjustment VR. 3NA: V606200 http://www.xiaoyu163.com...
Page 12: Circuit Board
MS400 3 7 63 1515 0 AMP1/5 Circuit Board L 13942296513 Pattern side u163 http://www.xiaoyu163.com...
Page 13: Circuit Board
MS400 3 7 63 1515 0 AMP2/5 Circuit Board AC IN to Coll (H model only) Pattern side to AMP3/5-CN205 (Component side) Component side L 13942296513 AMP3/5 Circuit Board to Transformer to AMP2/5 -W201A -W201B Pattern side Component side...
Page 14 MS400 3 7 63 1515 0 AMP4/5 Circuit Board LINE PARALLEL to AMP5/5-CN102 +4dB -50dB +4dB L 13942296513 Component side Pattern side u163 3NA: V606200 http://www.xiaoyu163.com...
Page 15 MS400 3 7 63 1515 0 IN2/2 Circuit Board AMP5/5 Circuit Board to AMP1/5-CN201 TONE CONTROL HIGH LIVE LEVEL MIC LEVEL MASTER LEVEL L 13942296513 to AMP4/5-CN101 Component side Pattern side u163 3NA: V606200 http://www.xiaoyu163.com...
Page 16 MS400 3 7 63 1515 0 INSPECTIONS • Amplifier unit Preparation 1) Input terminal LINE INPUT (XLR) MIC INPUT (XLR) 2) Output terminal: CN203 (VH4P) LF 1P(+) 2P(-), RL=4 ohms / Power capacity 500W HF 4P(+) 3P(-), RL=16 ohms / Power capacity 200W...
Page 17 MS400 3 7 63 1515 0 6) Output noise level Ground the input terminals LINE INPUT (XLR) and MIC INPUT (XLR) with a 600 ohm resistance connected to each terminal and measure the noise level at the output terminals LF and HF. The measured value should be as specified below.
Page 18 MS400 3 7 63 1515 0 • Finished product inspection Preparation 1) input terminal: LINE INPUT (XLR) 2) OUTPUT: 3) LINE LEVEL: MAX(10) 4) MIC LEVEL: MIN(0) 5) MASTER LEVEL: MAX(10) 6) TONE CONTROL HIGH: Center click position (0)
Page 19 3 7 6 3 1 5 1 5 0 MS400 MS400 OVERALL CIRCUIT DIAGRAM 1/2 ( AMP 1/5 , 2/5 , 3/5 ) to AMP 5/5 -CN103 1 3 9 4 2 2 9 6 5 1 3 Speaker...
Page 20 3 7 6 3 1 5 1 5 0 MS400 MS400 OVERALL CIRCUIT DIAGRAM 2/2 ( AMP 4/5 , 5/5 ) OP AMP (-50dB) OP AMP OP AMP OP AMP OP AMP LINE PARALLEL (JACK) OP AMP OP AMP...
Page 21: Parts List
3 7 63 1515 0 POWERED SPEAKER MS400 PARTS LIST CONTENTS OVERALL ASSEMBLY ..........2 AMPLIFIRE ASSEMBLY ......... 4 ELECTRICAL PARTS ..........6 L 13942296513 Notes : DESTINATION ABBREVIATIONS A : Australian model M : South African model B : British model...
Page 22 MS400 3 7 63 1515 0 OVERALL ASSEMBLY AMPLIFIRE ASSEMBLY (See page 4) L 13942296513 C100 220d 220c 220a 220b u163 http://www.xiaoyu163.com...
Page 23: Hexagonal Nut
MS400 3 7 63 1515 0 PART NO. DESCRIPTION REMARKS REF NO. RANK OVERALL ASSEMBLY Overall Assembly (V640020) Overall Assembly (V640030) Overall Assembly (V640040) Overall Assembly (V640050) Cabinet Assembly (V640490) V 6 4 0 5 1 0 0 Buffle Assembly...
Page 24 MS400 3 7 63 1515 0 AMPLIFIRE ASSEMBLY L 13942296513 u163 http://www.xiaoyu163.com...
Page 25 MS400 3 7 63 1515 0 PART NO. DESCRIPTION REMARKS REF NO. RANK AMPLIFIER ASSEMBLY Amplifier Assembly MS400 (V608740) Amplifier Assembly MS400 (V608750) Amplifier Assembly MS400 (V608760) Amplifier Assembly MS400 (V608770) VV104600 Cord Holder CV-100 Circuit Board AMP H...
Page 26 MS400 3 7 63 1515 0 ELECTRICAL PARTS PART NO. DESCRIPTION REMARKS REF NO. RANK ELECTRICAL PARTS AAX20590 Circuit Board AMP 1/5 (XY839B0) AAX20600 Circuit Board AMP 1/5 (XY839B0) AAX20610 Circuit Board AMP 2/5 (XY839B0) AAX20620 Circuit Board AMP 2/5...
Page 27 MS400 3 7 63 1515 0 PART NO. DESCRIPTION REMARKS REF NO. RANK C212 FU451220 Mica Cap. 22P 500V J C213 VV060300 Mylar Cap. 2200P 50V J C214 VV060300 Mylar Cap. 2200P 50V J C215 VZ354000 Ceramic Cap.-F 0.0100 50V Z...
Page 28 MS400 3 7 63 1515 0 PART NO. DESCRIPTION REMARKS REF NO. RANK D223 VD631600 Diode 1SS133,176,HSS104 D224 VU801600 Diode 1N4004L -233 VU801600 Diode 1N4004L D234 V 4 8 1 6 4 0 0 Twin Diode FMU-22U 10A 200V...
Page 29 MS400 3 7 63 1515 0 PART NO. DESCRIPTION REMARKS REF NO. RANK Q237N VR732800 Pair Transistor A1859A/C4883A Q237P VR732800 Pair Transistor A1859A/C4883A Q238N VZ222300 Pair Transistor A1492C3856(Z)(210) Q238P VZ222300 Pair Transistor A1492C3856(Z)(210) Q239N VR732800 Pair Transistor A1859A/C4883A Q239P...
Page 30 MS400 3 7 63 1515 0 PART NO. DESCRIPTION REMARKS REF NO. RANK R202 HF456100 Carbon Resistor 1.0K 1/4 J R203 HF457220 Carbon Resistor 22.0K 1/4 J R204 VZ010600 Metal Film Resistor 560.0 1/4 F R205 HF457220 Carbon Resistor 22.0K 1/4 J...
Page 31 MS400 3 7 63 1515 0 PART NO. DESCRIPTION REMARKS REF NO. RANK R307 V 2 9 6 1 0 0 0 Metal Oxide Film Resistor 4.7 2W J R310 VV276700 Flame Proof C. Resistor 4.7 1/4 J -313 VV276700 Flame Proof C.

Yamaha MS400 Service Manual

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