Yamaha MS300 Powered Speaker Service Manual 电路图.pdf

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1、MS300 1 SERVICE MANUAL PA 011612 1.395K-864 Printed in Japan 2001.12 HAMAMATSU, JAPAN This document is printed on chlorine free (ECF) paper with soy ink. POWERED SPEAKER CONTENTS SPECIFICATIONS. 3 DIMENSIONS. 4 BLOCK DIAGRAM. 4 PANEL LAYOUT. 5 CIRCUIT BOARD LAYOUT. 6 WIRING. 7 DISASSEMBLY PROCEDURE.

2、 8 IC BLOCK DIAGRAM. 10 CIRCUIT BOARDS. 11 INSPECTIONS. 14 OVERALL CIRCUIT DIAGRAM. 17 PARTS LIST MS300 ? ? ? ? ? ? ? ? ? ? RadioFans.CN 收音机爱 好者资料库 2 MS300 IMPORTANT NOTICE This manual has been provided for the use of authorized Yamaha Retailers and their service personnel. It has been assumed that

3、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. WARNING :Failure to follow appropriate service and safety procedures when servicing this product may result in per- sonal i

4、njury, destruction of expensive components and failure of the product to perform as specified. For these reasons, we advise all Yamaha product owners that all service required should be performed by an authorized Yamaha Retailer or the appointed service representative. IMPORTANT :This presentation o

5、r sale of this manual to any individual or firm does not constitute authorization certifi- cation, recognition of any applicable technical capabilities, or establish a principal-agent relationship of any form. The data provided is belived to be accurate and applicable to the unit(s) indicated on the

6、 cover. The research engineering, and service departments of Yamaha are continually striving to improve Yamaha products. Modifications are, therefore, inevitable and changes in specification are subject to change without notice or obligation to retrofit. Should any discrepancy appear to exist, pleas

7、e contact the distributors Service Division. WARNING :Static discharges can destroy expensive components. Discharge any static electricity your body may have accumulated by grounding yourself to the ground bus in the unit (heavy gauge black wires connect to this bus.) IMPORTANT :Turn the unit OFF du

8、ring disassembly and parts replacement. Recheck all work before you apply power to the unit. WARNING: CHEMICAL CONTENT NOTICE! The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and/or plastic (Where applicable) components may also contain trace

9、s of chemicals found by the California Health and Welfare Agency (and possibly other entities) to cause cancer and/or birth defects or other reproductive harm. DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REASON WHAT SO EVER! Avoid prolonged, unprotected con

10、tact between solder and your skin! When soldering, do not inhale solder fumes or expose eyes to solder/flux vapor! If you come in contact with solder or components located inside the enclosure of this product, wash your hands before handling food. WARNING Components having special characteristics ar

11、e marked and must be replaced with parts having specification equal to those originally installed. IMPORTANT NOTICE FOR THE UNITED KINGDOM Connecting the Plug and CoConnecting the Plug and CoConnecting the Plug and CoConnecting the Plug and CoConnecting the Plug and Cor r r r rd d d d d IMPORTANT.Th

12、e wires in this main lead are coloured in accordance with the following code: BLUE:NEUTRAL BROWN: LIVE As the colours of the wires in the main lead of this apparatus may not correspond with the coloured markings identifying the terminals in your plug, proceed as follows: The BLUE wire must be connec

13、ted to the terminal that is marked with the letter N (or coloured BLACK). The BROWN wire must be connected to the terminal that is marked with the letter L (or coloured RED). Be certain that neither core is connected to the earth terminal of the three pin plug. ? ? ? ? ? ? ? ? ? ? RadioFans.CN 收音机爱

14、好者资料库 MS300 3 SPECIFICATIONS General specifi cations Type Bi-Amp 2-way bass refl ex powered speaker (Bi-amplifi er electronic crossover network) Speaker unit LF: 30 cm cone HF: 5 cm Titanium diaphragm compression driver Frequency Range. 50 Hz16 kHz (10 dB) Maximum Output Level. 121 dB (1m on Axis) D

15、irectional angle. 90 (H)/40 (V) Dimension (W x H x D). 406 x 637 x 348.5 mm Weight . 23.7 kg Color. Black (approx. Munsell value: 5PB 2/1) Tripod pole diameter. 3536 mm Accessories.Power cord (AC inlet type, 2.5 m) Amp.unit Maximum Output Power LF: 225 W at 500 Hz, THD=1%, RL=4 HF: 85 W at 5 kHz, TH

16、D=1%, RL=16 Crossover frequency . 1.6 kHz (30 dB/oct.) Input Sensitivity . LINE: +4 dB*, MIC: 50 dB* Input impedance. LINE: 30 k, MIC: 5 k Controls LEVEL. MASTER, MIC, LINE EQ.LOW:0 (Max.) 8 dB (Min.) at 55 Hz HIGH: 3 dB (HF) Power switch. On/Off Connectors (all balanced): LINE in/out.XLR-3-31, XLR-

17、3-32, phone (They are all connected in parallel and can be used as line outputs.) MIC in. XLR-3-31 POWER indicator . Green LED Power RequirementUSA and Canada .120 V, 60 Hz Europe.230 V, 50 Hz Others .240 V, 50 Hz Power Consumption . 100 W Option. Bracket BWS251-400, BCS251, and BBS251 * 0 dB=0.775

18、V For European Model Purchaser/User Information specifi ed in EN55103-1 and EN55103-2. Inrush Current: 31A Conformed Environment: E1, E2, E3 and E4 ? ? ? ? ? ? ? ? ? ? RadioFans.CN 收音机爱 好者资料库 4 MS300 150 348.5406 637184 2-M8 depth17 DIMENSIONS Units: mm BLOCK DIAGRAM Remove the cover when you use op

19、tional brackets LOW CUTP.AMP P.AMP Mic Input Line LEVEL Mic LEVEL Master LEVEL LPF HPF Freq. response compensation LF HF SPEAKER SPEAKER Line Input/Output LOW EQ HIGH EQ Phone Jack HPF MIX 2/3MIX 1/3AMP IC102 Q101 Q102 21 3 21 3 2 1 3 3 1 2 + IC101 CN101 CN103 VR105 VR103 VR104 VR102 VR101 CN201CN20

20、3 CN102 ? ? ? ? ? ? ? ? ? ? MS300 5 1 2 3 4 5 6 7 8 9 PANEL LAYOUT POWER switch AC IN connector LINE connectors LINE LEVEL control MIC connector MIC control MASTER LEVEL control POWER indicator EQ control Rear Panel ? ? ? ? ? ? ? ? ? ? 6 MS300 CIRCUIT BOARD LAYOUT 1/3 AMP MIX 3/3MIX 2/3MIX ? ? ? ? ?

21、 ? ? ? ? ? MS300 7 WIRING Speakers WFTW CN203 (4P) CN201 (6P) CN202 CN103 1/3 CN102 CN101 2/3 Power Transformer CN104 AC.IN (V824770) (V824760) AMP MIX MIX 3/3MIX (6P) (6P) (6P) (6P) (3P) ? ? ? ? ? ? ? ? ? ? 8 MS300 DISASSEMBLY PROCEDURE Fig.1 1.Amplifier assembly (Time required: 5 min.) 1-1.Remove

22、the sixteen (16) screws marked 160A. The amplifier assembly can then be removed. (Fig. 1) 2.Cabinet assembly and buffle assembly (Time required: 10 min.) 2-1.Remove the sixteen (16) screws marked 150. The buffle assembly can then be removed from the capinet assembly. (Fig. 1) 3.Speakers (30cm) (Time

23、 required: 15 min.), Horn driver (Time required: 12 min.) and Diaphragm assembly (Time required: 11 min.) 3-1.Remove the buffle assembly from the cabinet assembly. (See Procedure 2.) 3-2-1. To remove the 30cm speaker, remove the four (4) screws marked 160B and the front grille. (Fig. 1) 3-2-2. Remov

24、e the eight (8) bolts marked 70. The 30cm speaker can then be removed. (Fig. 1) 3-3-1. To remove the horn driver, remove the four (4) screws marked 110. Then remove the speaker with the bracket. (Fig. 1) 3-3-2. Remove the two (2) screws marked 100. The horn driver can then be removed from the bracke

25、t. (Fig. 1) 3-4.Remove the three (3) screws marked 80b. The diaphrage assembly can then be removed. (Fig. 1) 70: Hexagonal Bolt 5.0 X 35 MFZN2BL (V6389200) 100: Bind Head Screw 1/4” -2ouncx 3/8” (V6289600) 110: Bind Head Tapping Screw-P 5.0 X 30 MFZN2BL (V6405200) 150: Bind Head Tapping Screw-P 5.0

26、X 50 MFZN2BL (V6084800) 160: Bind Head Screw-Giza 4 X 16 MFZN2BL (V6396400) 160A 160A 160A 150 150 150 160A 160B 70 30cm Speaker 100 110110 80b RedBlack Horn Driver Red marking Red marking YellowBlue 110 150 150150 ? ? ? ? ? ? ? ? ? ? MS300 9 AMP110ABind Head Tapping Screw-B 3.0 X 12 MFZN2BL (VQ0746

27、00)10 Circuit Board120Bind Head Screw SP 3.0 X 8 MFZN2Y (EG330290)4 MIX3/3110BBind Head Tapping Screw 3.0 X 12 MFZN2BL (VQ074600)2 Circuit Board130ABonding Screw-B 3.0 X 8 MFZN2BL (VN413300)2 150Bind Head Screw A4.0 X 8 MFZN2BL (VP156800)1 MIX2/3130BBonding Screw-B 3.0 X 8 MFZN2BL (VN413300)6 Circui

28、t BoardHexagonal Nut1 MIX1/3170Knob MX-GREEN/D-GRAY (VU860200)2 Circuit Board180Knob ORANGE/D-GRAY (VV625800)2 190Knob RED/D-GRAY (VU860400)1 220Button 3 X 25 MFZN2BL (V3289800)4 Fig.2 4.AMP and MIX (1/3 3/3) Circuit Boards (Time required: 7 min. each) 4-1.Remove the amplifier assembly. (See Procedu

29、re 1.) 4-2.Remove the screws and the knob from each circuit board, which can then be removed. (Fig. 2) 5.Power transformer (Time required: 7 min.) 5-1.Remove the amplifier assembly. (See Procedure 1.) 5-2.Remove the four (4) screws marked 100. The power transformer can then be removed. (Fig. 2) 100:

30、 Bonding Tapping Screw-B 4.0 X 12 MFZN2BL (V7242900) 110: Bonding Head Tapping Screw-B 3.0 X 12 MFZN2BL (VQ074600) 140: Bonding Tapping Screw-B 4.0 X 8 MFZN2BL (VR779900) PCB NameRef No.DescriptionQTY 100 Hexagonal nut 110B 170 180 220 220 190 130B 110A110A 1/3 140 120 120 130A150 AMP MIX 2/3MIX 3/3

31、MIX ? ? ? ? ? ? ? ? ? ? 10 MS300 IC BLOCK DIAGRAM Fig.3 10f: Bind Head Screw-B 5.0 X 35 MFZN2BL (VL670600) 10g: Hexagonal Nut 5.0 MFZN2BL (VB664600) 6.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 mar

32、ked 10g. The handle can then be removed. (Fig.3) 7.Heat sink (Time required: 8 min.) 7-1.Remove the amplifier assembly. (See Procedure 1.) 7-2.Remove the AMP circuit board. (See Step 4-2.) 7-3.Remove the three (3) screws marked 140. The heat sink can then be removed. (Fig.2) NJM2068L-D (XM356A00) NJ

33、M4580L (XF195A00) Operational Amplifier MIX: IC101,IC103,IC104,IC105, IC106,IC107,IC108 MIX: IC102 1 A 2345678 INV+INOUT AAA +VIN+INOUT BBB + B + 10g 10f ? ? ? ? ? ? ? ? ? ? MS300 11 CIRCUIT BOARDS AMP Circuit Board Component side 3LP-X0155A0 Notes: VR201, VR202: Idling Adjustment VR. Note: See part

34、s list for details of circuit board component parts. CN203: to Woffer (1,2pin) CN201: to MIX 1/3-CN103CN202: to Transformer CN203: to Tweeter (3,4pin) ? ? ? ? ? ? ? ? ? ? 12 MS300 AMP Circuit Board Pattern side ? ? ? ? ? ? ? ? ? ? MS300 13 to Transformer AC IN POWER ON/OFF to MIX 1/3-CN102 to MIX 2/

35、3-CN101 to AMP-CN201 +4dB-50dB PARALLEL LINEMIC EQ LOW LIVE LEVELMIC LEVELMASTER LEVEL EQ HIGH POWER 3LP-X0367A0 MIX1/3 Circuit Board MIX2/3 Circuit Board Component side MIX3/3 Circuit Board Component side Component side ? ? ? ? ? ? ? ? ? ? 14 MS300 INSPECTIONS Amplifier unit 1.Preparation 1) Input

36、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) 5) MASTER LEVEL: MAX(10) 6) TONE CONTROL HIGH: Center click position (0) 7

37、) TONE CONTROL LOW: MAX (0) 8) The input signals should be in the form of sine wave. 2.Inspection 1) Power ON muting time Check that the muting function is cancelled and the relay turns on in 31 seconds after the power switch is turned on. Also, check that the power indicator lights up., 2) Idling c

38、urrent adjustment Adjust VR201 and VR202 so that the voltage between Pins 1 and 2 of CN206 and CN207 becomes 10.2mV respectively. 3) Midpoint potential Check the DC voltage of CN203 (VH4P) when no signal is applied. It should be within 70mV both at LF (between Pins 1 and 2) and at HF (between Pins 3

39、 and 4). 4) Gain / Efficiency Input a 500Hz, -1dBu signal to the input terminal Line INPUT (XLR) and check that the output voltage at the output terminal LF is +251dBu. Also, check that the primary side power consumption at this time is 11020W. 5) Full harmonic distortion Input a 500Hz signal to the

40、 input terminal LINE INPUT (XLR) and check that the full harmonic distortion when the output voltage at the output terminal LF is 31.8dBu is THD+N=1% or less. Input a 5kHz signal to the input terminal LINE INPUT (XLR) and check that the full harmonic distortion when the output voltage at the output terminal HF is 33.6dBu is THD+N=1% or less. This measurement should be completed within 30 seconds. ? ? ? ? ? ?