Yamaha-MS-400-Service-Manual电路原理图.pdf

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1、MS400 1 SERVICE MANUAL PA 011556 20001210-98000 1.415K-215 K Printed in Japan 2000.12 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 DISAS

2、SEMBLY PROCEDURE. 8 IC BLOCK DIAGRAM. 10 CIRCUIT BOARDS. 11 INSPECTIONS. 16 OVERALL CIRCUIT DIAGRAM. 19 PARTS LIST MS400 RadioFans.CN 收音机爱 好者资料库 MS400 2 2 IMPORTANT NOTICE This manual has been provided for the use of authorized Yamaha Retailers and their service personnel. It has been assumed that b

3、asic 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 in

4、jury, 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 or

5、 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, please

7、 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 dur

8、ing 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 traces

9、 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 cont

10、act 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 are

11、 marked and must be replaced with parts having specification equal to those originally installed. 2 RadioFans.CN 收音机爱 好者资料库 MS400 3 SPECIFICATIONS General specifi cations Type Amp.unit HF:100W at 5kHz, THD=1%, RL=16 ohms Bi-Amp 2-way bass reflex powered speaker (Bi-amp lifier electronic crossover ne

12、twork) Speaker unit LF : 38 cm cone HF : 5 cm Titanium diaphragm compression driver Frequency Range . 50 Hz16 kHz (-10 dB) Maximum Output Level . 124.5 dB (1m on Axis) Directional angle . 90 (H)/40 (V) Dimension (W x H x D) . 449 x 683 x 379 mm Weight . 24.2 kg Color . Black (approx.Munsell value: 5

13、PB 2/1) Tripod diameter pole . 3536 mm Accessories . Power cord (AC inlet type, 2.5 m) Maximum Output Power LF: 300W at 500Hz, THD=1%, RL=4 ohms Cross over frequency . 1.6 kHz (30dB/oct.) Input Sensitivity . LINE: +4dB*, MIC: -50dB* Input impedance . LINE: 30 kohms, MIC: 5 kohms Controls LEVEL . LIN

14、E, MIC , MASTER EQ . LOW: 0 (Max.) -10 dB (Min.) at 55 Hz HIGH: 3 dB (HF) Power switch . On/Off Connectors (all balanced): LINE in/out . XLR-3-31, XLR-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 Requirement USA

15、 and Canada . 120 V, 60 Hz Europe . 230 V, 50 Hz Others . 240 V, 50 Hz Power Consumption . 120 W Accessor ies . Bracketadapter BAD251 (for BWS251-400, BCS251, and BBS251) * 0 dB=0.775 V For European Model Purchaser/User Information specified in EN55103-1 and EN55103-2. Inrush Current: 25A Conformed

16、Environment: E1, E2, E3 and E4 MS400 4 DIMENSIONS BLOCK DIAGRAM Units: mm 683 379449 203 241 M8 Remove the cover when you use optional brackets LOW CUTP.AMP P.AMP Mic Input IC102 VR101VR104 VR105 VR103 IC104 IC107IC108 IC106 IC105 VR102 2 13131 57 51 51 3 2 1 3IC101 Line MicMaster LPF HPF Freq. resp

17、onse compensation LF HF SPEAKER SPEAKER Line Input/Output LOW EQ HIGH EQ Phone Jack HPF AMP 4/5AMP 5/5AMP 1/5 CN102-6 CN101-6 CN102-4 CN101-4 CN201-6 CN103-6 CN201-4 CN203-3(LF-), CN203-4(LF+) CN203-1(HF+), CN203-2(HF-) CN103-4 MS400 5 1 3 2 2 3 1 1 3 2 LOWHIGH LEVELLEVELLEVEL 9 1234 5 6 7 8 TONE CO

18、NTROL 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 TONE CONTROL Rear Panel MS400 6 CIRCUIT BOARD LAYOUT 1/5 5/5 4/5 2/5 3/5 AMP AMP AMP AMP AMP MS400 7 WIRING 1/5 Speakers WFTW CN203 CN20

19、1 CN202 CN103 5/5 CN102 CN1014/5 Transformer CN204 3/5 CN205 P.SWAC.IN 2/5 YEBL CN208 Coil H only AMP AMP AMP AMPAMP MS400 8 DISASSEMBLY PROCEDURE Fig.1 1.Amplifier assembly 1-1.Remove the sixteen (16) screws marked 180A. The amplifier assembly can then be removed. (Fig. 1) 2.Cabinet assembly and bu

20、ffle assembly 2-1.Remove the nineteen (19) screws marked 170. The buffle assembly can then be removed from the capinet assembly. (Fig. 1) 3.Speakers (38cm, 25mm) 3-1.Remove the buffle assembly from the cabinet assembly. (See Procedure 2.) 3-2.To remove the 38cm speaker, remove the four (4) screws ma

21、rked 180B and the front grille. (Fig. 1) 3-3.Remove the eight (8) bolts marked 70. The 38cm speaker can then be removed. (Fig. 1) 3-4.To remove the 25mm speaker, remove the four (4) screws marked 120. Then remove the speaker with the bracket. (Fig. 1) 3-5.Remove the two (2) screws marked 100. The 25

22、mm speaker can then be removed from the bracket. (Fig. 1) 70: Hexagonal Bolt 5.0 X 35 MFZN2BL (V6389200) 120: Bind Head Tapping Screw-P 5.0 X 30 MFZN2BL (V6405200) 170: Bind Head Tapping Screw-P 5.0 X 50 MFZN2BL (V6084800) 180: Bind Head Screw-Giza 4 X 16 MFZN2BL (V6396400) 170 180B 170 180A 180A 70

23、 170 38cm Speaker 100 RedBlack RedBlack 25mm Speaker Red marking Yellow Blue 120 MS400 9 Fig.2 4.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) 5.Power transformer 5

24、-1.Remove the amplifier assembly. (See Procedure 1.) 5-2.Remove the four (4) screws marked 80B. The power transformer can then be removed. (Fig. 2) 80: Bonding Screw-B 4.0 X 12 MFZN2BL (V7242900) AMP1/590Bind Head Tapping Screw-B 3.0 X 12 MFZN2BL (VQ074600)10 Circuit Board100Bind Head Screw SP 3.0 X

25、 8 MFZN2Y (EG330290)4 AMP2/580ABonding Screw-B 4.0 X 12 MFZN2BL (V7242900)2 Circuit Board130Bind Head Screw 4.0 X 8 MFZN2BL (VP156800)1 AMP3/5 110ABonding Screw-B 3.0 X 8 MFZN2BL (VN413300)2 Circuit Board AMP4/5110BBonding Screw-B 3.0 X 8 MFZN2BL (VN413300)6 Circuit BoardHexagonal Nut1 AMP5/5150Knob

26、 MX-GREEN/D-GRAY (VU860200)2 Circuit Board160Knob ORANGE/D-GRAY (VV625800)2 170Knob RED/D-GRAY (VU860400)1 200Button 3 X 25 MFZN2BL (V3289800)4 PCB NameRef No.DescriptionQty 80B Hexagonal nut 80A 150 160 200 170 110B 100 1/5 9090 5/5 4/5 120 2/5 3/5 110A 130 AMP AMP AMP AMP AMP MS400 10 IC BLOCK DIA

27、GRAM Fig.3 120: Bonding Screw-B 4.0 X 8 MFZN2BL (VR779900) 6.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) 7.Heat sink 7-1.Remove the amplifier assembly. (See Procedure 1.) 7-

28、2.Remove the AMP 1/5 circuit board. (See Step 4-2.) 7-3.Remove the three (3) screws marked 120. The heat sink can then be removed. (Fig.2) 80 70 NJM2068L-D (XM356A00) NJM4580L (XF195A00) Operational Amplifier (IC101,103,104,105,106,107,108) (IC102) 1 A 2345678 INV+INOUT AAA +VIN+INOUT BBB + B + 11 M

29、S400 CIRCUIT BOARDS AMP1/5 Circuit Board Component side 3NA: V606200 to AMP5/5 -CN103 to Transformer CN203: to SPEAKER Notes: VR201, VR202: Idling Adjustment VR. MS400 12 AMP1/5 Circuit Board Pattern side 13 MS400 Component side 3NA: V606200 to Coll (H model only) to Transformer to AMP2/5 -W201A -W2

30、01B to AMP3/5-CN205 (Component side) AC IN PSW AMP2/5 Circuit Board AMP3/5 Circuit Board Component side Pattern side Pattern side MS400 14 AMP4/5 Circuit Board LINE PARALLELMICto AMP5/5-CN102 +4dB +4dB -50dB Pattern side Component side 3NA: V606200 15 MS400 Pattern side IN2/2 Circuit Board to AMP1/5

31、-CN201 TONE CONTROL LOW LIVE LEVELMIC LEVELMASTER LEVEL HIGH to AMP4/5-CN101 Component side AMP5/5 Circuit Board 3NA: V606200 MS400 16 INSPECTIONS Amplifier unit 1.Preparation 1) Input terminal LINE INPUT (XLR) MIC INPUT (XLR) 2) Output terminal: CN203 (VH4P) LF 1P(+) 2P(-), RL=4 ohms / Power capaci

32、ty 500W HF 4P(+) 3P(-), RL=16 ohms / Power capacity 200W or more 3) LINE LEVEL: MAX (10) 4) MIC LEVEL: MIN (0) 6) TONE CONTROL HIGH: Center click position (0) 7) 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 mut

33、ing 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 current adjustment Adjust VR201 and VR202 so that the voltage between Pins 1 and 2 of CN206 and CN207 becomes 10.2mV respectively. 3) Midpoin

34、t 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 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 ou

35、tput terminal LF is +281dBu. Also, check that the primary side power consumption at this time is 18030W. 5) Full harmonic distortion Input a 500Hz signal to the input terminal LINE INPUT (XLR) and check that the full harmonic distortion when the output voltage at the output terminal LF is 300W is TH

36、D+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 100W is THD+N=1% or less. This measurement should be completed within 30 seconds. 17 MS400 6) Output noise level Ground the inpu

37、t 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. Use a DIN audio filter for the noise meter. LF -62dBu HF -65dBu 7) Frequency response

38、characteristics Input -20dBu signals of 50Hz, 1kHz, 2kHz and 15kHz to the input terminal LINE INPUT (XLR). Using the output voltage measured at the output terminal LF when a 1kHz, -20dBu signal is input as standard (0dB), check that the output voltages measured at LF and HF are as specified below. 8

39、) Tone control high change characteristics Input a 5kHz, -20dBu signal to the input terminal LINE INPUT (XLR), move the tone control high VR and check that the output voltage measured at the output terminal HF then is as follows, using the output voltage when the VR is at the center click position a

40、s standard (0dB). MAX(+3): +2.5dB 1dB MIN(-3):-3.5dB 1dB 9) Tone control low change characteristic Input a 50kHz, -20dBu signal to the input terminal LINE INPUT (XLR), move the tone control low VR and check that the output voltage measured at the output terminal LF then is as follows, using the outp

41、ut voltage when the VR is at the MAX position as standard (0dB). the MAX position as standard (0dB) MIN(-10): -9dB 1dB 10) MIC input Input a 500Hz, -55dBu signal to the input terminal MIC INPUT (XLR), set the MIC level to MAX (10) and check that the output voltage measured then is 28 1dBu. 11) Prote

42、ction circuit Apply DC+5V (power supply output resistance = 10 kohm) between Pins 1 and 2 of the connector CN208 and check that the relay turns off within 1 second. Also, check that it returns automatically within 10 seconds when the input signal is shut off. Frequency (Hz)LFHF 50+8.52.0dB- 1k0dB-16

43、.52.0dB 2k-92.0dB-4.52.0dB 15k-+6.52.0dB MS400 18 Finished product inspection 1.Preparation 1) input terminal: LINE INPUT (XLR) 2) OUTPUT:LF HF 3) LINE LEVEL: MAX(10) 4) MIC LEVEL: MIN(0) 5) MASTER LEVEL: MAX(10) 6) TONE CONTROL HIGH: Center click position (0) 7) TONE CONTROL LOW: MAX(0) 2.Inspectio

44、n 1) Input a 20Hz to 20kHz, 0.08V(-19.72dBu) sine wave signal to the input terminal LINE INPUT (XLR) and check that none of the contact of the voice coil, air leakage and abnormal noise such as vibration noise occurs. Next, input music signals to the input terminal LINE INPUT (XLR), move each VR kno

45、b and check that the sound volume and tone quality change smoothly without producing noise. 2) Phase of speaker output Check that the output at LF is in positive phase with respect to the input signal and the output at HF is in negative phase with respect to the input signal. 6 5 4 3 HFGEDCBA AHGFED

46、CB 1 2 19 338CA2-8818015 1/5 Note : See parts list for details of circuit board component parts. 3/5 : Mylar Capacitor : Ceramic Capacitor 2/5 DESTINATION MS400 OVERALL CIRCUIT DIAGRAM 1/2 (AMP 1/5, 2/5, 3/5) MS400 MS400MS400 to AMP 5/5 -CN103 Speaker REGULATOR N.C N.C N.C AC IN NJM7815FA (XD853A00) REGULATOR 2 3 1 NJM7915FA (XD854A00) 1: OUTPUT 2: COMMON 3: INPUT 2 2: GND 1: INPUT 3: OUTPUT 1 3 REGULATOR -15V : Mica Capacitor : Metal Film Resistor : Flame ProofC. Resister AMP AMP AMP 6 5 4 3 1 2 20 HABGFCDE AHGBCFED 4/55/5 MIC (-50dB) (JACK) LINE PARALLEL (+4dB) (+4dB) MS400