Yamaha Ms400 User manual

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

DISASSEMBLY PROCEDURE .............................. 8

IC BLOCK DIAGRAM ................................... 10

CIRCUIT BOARDS ........................................ 11

INSPECTIONS ............................................................ 16

OVERALL CIRCUIT DIAGRAM ........................... 19

PARTS LIST

MS400

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MS400

22

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 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 injury, 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 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 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 contact the distributor’s 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 during 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 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 contact 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 marked and must be replaced with parts having specification equal to those

originally installed.

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MS400

3

SPECIFICATIONS

General speciﬁcations

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 network))

Speaker unit

LF : 38 cm cone

HF : 5 cm Titanium diaphragm compression driver

Frequency Range .................. 50 Hz~16 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:

5PB 2/1)

Tripod diameter pole .............. 35~36 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 .............. LINE, 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 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 Environment: E1, E2, E3 and E4

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MS400

4

DIMENSIONS

BLOCK DIAGRAM

Units: mm

683

379

449

203

241 M8 Remove the cover when you

use optional brackets

LOW CUT P.AMP

P.AMP

Mic Input IC102

VR101 VR104

VR105

VR103

IC104

IC107 IC108

IC106

IC105

VR102

213131

57

51

3

21

3IC101

Line

Mic Master LPF

HPF

Freq. response

compensation

LF

HF

SPEAKER

Line Input/Output

LOW

EQ

HIGH

EQ

Phone Jack

HPF

AMP 4/5 AMP 5/5 AMP 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

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MS400

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LOW HIGH

LEVEL LEVEL LEVEL

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TONE CONTROL

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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

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MS400

6

CIRCUIT BOARD LAYOUT

1/5

5/5

4/5

2/5

3/5

AMP

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MS400

7

WIRING

1/5

Speakers

WF TW

CN203

CN201

CN202

CN103

5/5

CN102

CN101

4/5

Transformer

CN204

3/5

CN205

P.SWAC.IN

2/5

YE BL

CN208

Coil

H only

AMP

AMP AMPAMP

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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 buffle 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 marked [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 25mm

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]

[70]

[170]

38cm Speaker

[100]

Red Black

25mm Speaker

Red marking

Yellow Blue

[120]

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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

5-1. 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)

AMP1/5 90 Bind Head Tapping Screw-B 3.0 X 12 MFZN2BL (VQ074600) 10

Circuit Board

100 Bind Head Screw SP 3.0 X 8 MFZN2Y (EG330290) 4

AMP2/5 80A Bonding Screw-B 4.0 X 12 MFZN2BL (V7242900) 2

Circuit Board

130 Bind Head Screw 4.0 X 8 MFZN2BL (VP156800) 1

AMP3/5 110A Bonding Screw-B 3.0 X 8 MFZN2BL (VN413300) 2

Circuit Board

AMP4/5 110B Bonding Screw-B 3.0 X 8 MFZN2BL (VN413300) 6

Circuit Board

Hexagonal Nut 1

AMP5/5 150 Knob MX-GREEN/D-GRAY (VU860200) 2

Circuit Board

160 Knob ORANGE/D-GRAY (VV625800) 2

170 Knob RED/D-GRAY (VU860400) 1

200 Button 3 X 25 MFZN2BL (V3289800) 4

PCB Name Ref No. Description Q'ty

[80B] Hexagonal

nut

[80A]

[150]

[160]

[200]

[170]

[110B]

[100]

1/5

[90] [90]

5/5

4/5

[120]

2/5

3/5

[110A]

[130]

AMP

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MS400

10

IC BLOCK DIAGRAM

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.)

7-2. 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

2 3 4 5 6 7 8

IN V

+

IN

OUT

AAA

+

VIN

+

IN OUT

BBB

+

B

+

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MS400

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.

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MS400

12

AMP1/5 Circuit Board

Pattern side

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MS400

Component side

3NA: V606200

to Coll

(H model only)

to Transformer

to AMP2/5

-W201A

-W201B

to AMP3/5-CN205

(Component side)

AC IN

PSW

AMP2/5 Circuit Board

AMP3/5 Circuit Board

Component side

Pattern side

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MS400

14

AMP4/5 Circuit Board

LINE PARALLEL MIC to AMP5/5-CN102

+4dB

-50dB

Pattern side

Component side

3NA: V606200

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15

MS400

Pattern side

IN2/2 Circuit Board

to AMP1/5-CN201

TONE CONTROL

LOW

LIVE LEVEL MIC LEVEL MASTER LEVEL

HIGH

to AMP4/5-CN101

Component side

AMP5/5 Circuit Board

3NA: V606200

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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 capacity 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 muting function is cancelled and the

relay turns on in 3±1 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 1±0.2mV 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 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 +28±1dBu. Also, check

that the primary side power consumption at this time

is 180±30W.

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 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

100W is THD+N=1% or less.This measurement

should be completed within 30 seconds.

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17

MS400

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. Use

a DIN audio filter for the noise meter.

LF -62dBu

HF -65dBu

7) Frequency response characteristics

Input-20dBusignalsof50Hz,1kHz,2kHzand15kHz

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) 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 as 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 output

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) Protection 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)

LF HF

50 +8.5±2.0dB --

1k 0dB -16.5±2.0dB

2k -9±2.0dB -4.5±2.0dB

15k -- +6.5±2.0dB

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TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

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. Inspection

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 knob 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.

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HFGEDCBA

A HGFEDCB

1

2

19

3

38CA2-8818015

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

AC IN

NJM7815FA (XD853A00)

REGULATOR

23

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

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http://www.xiaoyu163.com

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20

HAB GFCDE

A HGBC FED

4/5 5/5

MIC

(-50dB)

(JACK)

LINE

PARALLEL

(+4dB)

MS400 OVERALL CIRCUIT DIAGRAM 2/2 (AMP 4/5,5/5)MS400

MS400MS400

38CA2-8818015

-CN201

to AMP 1/5

OP AMP

OP AMP OP AMP

OP AMP

OP AMP OP AMP OP AMP OP AMP OP AMP

AMP AMP

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TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

Yamaha MS400 User manual

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