Yamaha MS 300 Service Manual
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Yamaha MS 300 Service Manual

Yamaha MS 300 Service Manual

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3 7 63 1515 0
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L 13942296513
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This document is printed on chlorine free (ECF) paper with soy ink.
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PA
011612

CONTENTS

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PARTS LIST
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POWERED SPEAKER
MS300
SERVICE MANUAL
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HAMAMATSU, JAPAN
1.395K-864
Printed in Japan 2001.12
MS300
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  • Page 1 http://www.xiaoyu163.com MS300 3 7 63 1515 0 POWERED SPEAKER MS300 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: Dimensions

    http://www.xiaoyu163.com MS300 3 7 63 1515 0 SPECIFICATIONS General specifications Type Controls Bi-Amp 2-way bass reflex powered speaker LEVEL ....MASTER, MIC, LINE (Bi-amplifier electronic crossover network)) EQ ....... LOW: 0 (Max.) ~ –8 dB (Min.) at 55 Hz HIGH: ±3 dB (HF) Speaker unit Power switch......

  • Page 4: Block Diagram

    http://www.xiaoyu163.com MS300 3 7 63 1515 0 DIMENSIONS Remove the cover when you 2-M8 depth17 use optional brackets Units: mm 348.5 L 13942296513 BLOCK DIAGRAM Q101 Q102 Mic Input LOW CUT P.AMP IC102 Mic LEVEL Master LEVEL VR101 VR104 SPEAKER CN101 CN102 VR103...
  • Page 5 http://www.xiaoyu163.com MS300 3 7 63 1515 0 PANEL LAYOUT Rear Panel L 13942296513 POWER switch AC IN connector LINE connectors LINE LEVEL control MIC connector MIC control MASTER LEVEL control POWER indicator EQ control u163 http://www.xiaoyu163.com...

  • Page 6: Circuit Boards

    http://www.xiaoyu163.com MS300 3 7 63 1515 0 CIRCUIT BOARD LAYOUT L 13942296513 u163 http://www.xiaoyu163.com...
  • Page 7 http://www.xiaoyu163.com MS300 3 7 63 1515 0 WIRING Speakers CN203 (4P) CN202 (6P) CN201 (6P) L 13942296513 (V824760) Power (6P) CN103 Transformer CN102 (6P) (3P) CN104 (V824770) (6P) CN101 AC.IN u163 http://www.xiaoyu163.com...

  • Page 8: Disassembly Procedure

    http://www.xiaoyu163.com MS300 3 7 63 1515 0 DISASSEMBLY PROCEDURE Amplifier assembly (Time required: 5 min.) 1-1. Remove the sixteen (16) screws marked [160A]. The amplifier assembly can then be removed. (Fig. 1) Cabinet assembly and buffle assembly (Time required: 10 min.) 2-1.

  • Page 9: 5-2. Remove The Four (4) Screws Marked [100]. The Power

    http://www.xiaoyu163.com MS300 3 7 63 1515 0 AMP and MIX (1/3 ~ 3/3) Circuit Boards (Time required: 7 min. each) 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: Circuit Board

    http://www.xiaoyu163.com MS300 3 7 63 1515 0 Handle (Time required: 13 min.) 6-1. Remove the cabinet assembly. (See Procedure 2.) 6-2. Remove the two (2) screws marked [10f] and the two (2) nuts marked [10g]. The handle can then be removed.
  • Page 11 http://www.xiaoyu163.com MS300 3 7 63 1515 0 CIRCUIT BOARDS AMP Circuit Board CN203: to Woffer (1,2pin) CN203: to Tweeter (3,4pin) L 13942296513 CN201: to MIX 1/3-CN103 CN202: to Transformer Component side u163 Notes: VR201, VR202: Idling Adjustment VR. Note: See parts list for details of circuit board component parts. 3LP-X0155A0 http://www.xiaoyu163.com...
  • Page 12 http://www.xiaoyu163.com MS300 3 7 63 1515 0 AMP Circuit Board L 13942296513 Pattern side u163 http://www.xiaoyu163.com...
  • Page 13 http://www.xiaoyu163.com MS300 3 7 63 1515 0 MIX1/3 Circuit Board to AMP-CN201 POWER EQ LOW EQ HIGH LIVE LEVEL MIC LEVEL MASTER LEVEL Component side to MIX 2/3-CN101 MIX2/3 Circuit Board LINE L 13942296513 to MIX 1/3-CN102 +4dB -50dB PARALLEL Component side POWER ON/OFF...
  • Page 14 http://www.xiaoyu163.com MS300 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 or more 3) LINE LEVEL: MAX (10) 4) MIC LEVEL: MIN (0)
  • Page 15 http://www.xiaoyu163.com MS300 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 16 http://www.xiaoyu163.com MS300 3 7 63 1515 0 • Finished product inspection Preparation 1) input terminal: LINE INPUT (XLR) 2) LINE LEVEL: MAX(10) 3) MIC LEVEL: MIN(0) 4) MASTER LEVEL: MAX(10) 5) EQ HIGH: Center click position (0) 6) EQ LOW: MAX(0) Inspection 1) Input a 20Hz to 20kHz, 0.08Vrms(-19.72dBu) sine wave signal to the input terminal LINE INPUT (XLR)
  • Page 17 http://www.xiaoyu163.com 3 7 6 3 1 5 1 5 0 MS300 MS300 OVERALL CIRCUIT DIAGRAM 1/2 ( AMP ) D10XB20 (V2954200) DIODE STACK to MIX 1/3 -CN103 NJM7815FA(XD853A00) REGULATOR +15V 1 3 9 4 2 2 9 6 5 1 3 1: OUTPUT Tweeter 2: COMMON...
  • Page 18 http://www.xiaoyu163.com 3 7 6 3 1 5 1 5 0 MS300 MS300 OVERALL CIRCUIT DIAGRAM 2/2 ( MIX 1/3 , 2/3, 3/3 ) MIC LEVEL MASTER LEVEL OP AMP LINE LEVEL OP AMP MIC IN OP AMP OP AMP LINE IN [PHONE] OP AMP OP AMP OP AMP...

  • Page 19: Parts List

    http://www.xiaoyu163.com 3 7 63 1515 0 POWERED SPEAKER MS300 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 O : Chinese model C : Canadian model Q : South-east Asia model...
  • Page 20 http://www.xiaoyu163.com MS300 3 7 63 1515 0 OVERALL ASSEMBLY AMPLIFIRE ASSEMBLY (See page 4) L 13942296513 190d 190c 190a 190b u163 http://www.xiaoyu163.com...
  • Page 21 http://www.xiaoyu163.com MS300 3 7 63 1515 0 PART NO. DESCRIPTION REMARKS REF NO. RANK OVERALL ASSEMBLY MS300 Overall Assembly (V792250) Overall Assembly (V792260) Overall Assembly H,B,W (V792270) Overall Assembly (V792280) Cabinet Assembly (V792360) V 7 9 2 3 8 0 0 SP Cabinet Bolt 12X20 MFZN2BL...
  • Page 22 http://www.xiaoyu163.com MS300 3 7 63 1515 0 AMPLIFIRE ASSEMBLY L 13942296513 20 3/3 20 2/3 u163 http://www.xiaoyu163.com...
  • Page 23 http://www.xiaoyu163.com MS300 3 7 63 1515 0 PART NO. DESCRIPTION REMARKS REF NO. RANK AMPLIFIER ASSEMBLY Amplifier Assembly (V792320) Amplifier Assembly (V792330) Amplifier Assembly H,B,W (V792340) Amplifier Assembly (V792350) V 7 9 1 5 8 0 0 Circuit Board AMP JU J,U,V V 7 9 1 5 9 0 0 Circuit Board...
  • Page 24 http://www.xiaoyu163.com MS300 3 7 63 1515 0 ELECTRICAL PARTS PART NO. DESCRIPTION REMARKS REF NO. RANK ELECTRICAL PARTS V 7 9 1 5 8 0 0 Circuit Board AMP JU J,U,V (X0155A0) V 7 9 1 5 9 0 0 Circuit Board AMP H H,B,W,A...
  • Page 25 http://www.xiaoyu163.com MS300 3 7 63 1515 0 PART NO. DESCRIPTION REMARKS REF NO. RANK D211 VQ469600 Diode HSS82 -214 VQ469600 Diode HSS82 D215 VN478200 Diode D1NL20U -218 VN478200 Diode D1NL20U D219 VU801600 Diode 1N4004L -222 VU801600 Diode 1N4004L D223 VD631600 Diode 1SS133,176,HSS104 D224...
  • Page 26 http://www.xiaoyu163.com MS300 3 7 63 1515 0 PART NO. DESCRIPTION REMARKS REF NO. RANK R214 HF455560 Carbon Resistor 560.0 1/4 J R215 V 2 4 4 0 4 0 0 Metal Film Resistor 12K 1/4 F R216 V 2 4 4 0 4 0 0 Metal Film Resistor 12K 1/4 F R217...
  • Page 27 http://www.xiaoyu163.com MS300 3 7 63 1515 0 PART NO. DESCRIPTION REMARKS REF NO. RANK V 7 9 1 6 0 0 0 Circuit Board MIX(1/3,2/3,3/3) J,U,V (X0367A0) V 7 9 1 6 1 0 0 Circuit Board MIX(1/3,2/3,3/3) H,B,W,A (X0367A0) VV319600 Fuse Holder CQ-05CT...
  • Page 28 http://www.xiaoyu163.com MS300 3 7 63 1515 0 PART NO. DESCRIPTION REMARKS REF NO. RANK IC103 XM356A00 NJM2068L-D OP AMP -108 XM356A00 NJM2068L-D OP AMP JK101 VU805200 XLM Connector XLR Jack NC3FAV1-0 MIC IN(-50dB) JK102 V 8 8 6 5 6 0 0 XLM Connector XLR Jack NC3MAV LINE OUT (+4dB) PARALLEL...
  • Page 29 http://www.xiaoyu163.com MS300 3 7 63 1515 0 PART NO. DESCRIPTION REMARKS REF NO. RANK VR101 V 5 5 2 1 5 0 0 Rotary Variable Resistor A 20.0K RK09D113 MIC LEVEL VR102 V 5 5 2 1 5 0 0 Rotary Variable Resistor A 20.0K RK09D113 LINE LEVEL...

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