Yamaha Ms300 User manual

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 .............................. 8

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

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

INSPECTIONS ............................................................ 14

OVERALL CIRCUIT DIAGRAM ........................... 17

PARTS LIST

MS300

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MS300

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.

IMPORTANT NOTICE FOR THE UNITED KINGDOM

Connecting the Plug and CoConnecting the Plug and Co

Connecting the Plug and Corr

rr

rdd

dd

d

IMPORTANT. The 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 connected 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.

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MS300

3

SPECIFICATIONS

General speciﬁcations

TypeBi-Amp 2-way bass reﬂex powered speaker

(Bi-ampliﬁer electronic crossover network))

Speaker unit

LF: 30 cm cone

HF: 5 cm Titanium diaphragm compression driver

Frequency Range.................. 50 Hz~16 kHz (–10 dB)

Maximum Output Level.......... 121 dB (1m on Axis)

Directional 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.............. 35~36 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

Ω

HF: 85 W at 5 kHz, THD=1%, RL=16 Ω

Crossover frequency ............. 1.6 kHz (30 dB/oct.)

Input Sensitivity ..................... LINE: +4 dB*, MIC: –50 dB*

Input impedance.................... LINE: 30 kΩ, MIC: 5 kΩ

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-3-32, phone

(Theyareallconnectedin 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.............. 100 W

Option.................................... Bracket 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: 31A

Conformed Environment: E1, E2, E3 and E4

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MS300

150

348.5

406

637 184

2-M8 depth17

DIMENSIONS

Units: mm

BLOCK DIAGRAM

Remove the cover when you

use optional brackets

LOW CUT P.AMP

P.AMP

Mic Input

Line LEVEL

Mic LEVEL Master LEVEL LPF

HPF

Freq. response

compensation

LF

HF

SPEAKER

Line Input/Output LOW

EQ

HIGH

EQ

Phone Jack

HPF

MIX 2/3 MIX 1/3 AMP

IC102

Q101

Q102

21

3

21

3

2

1

3

31

2

+

IC101

CN101

CN103

VR105

VR103

VR104

VR102

VR101

CN201 CN203

CN102

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MS300

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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

EQ control

Rear Panel

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MS300

CIRCUIT BOARD LAYOUT

1/3

AMP

MIX

3/3MIX 2/3MIX

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MS300

7

WIRING

Speakers

WF TW

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)

(3P)

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8

MS300

DISASSEMBLY PROCEDURE

Fig.1

1. Amplifier assembly (Time required: 5 min.)

1-1. Remove 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 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. Remove the eight (8) bolts marked [70].The 30cm

speaker can then be removed.(Fig. 1)

3-3-1. Toremove 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 bracket.(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 X 50 MFZN2BL (V6084800)

[160]: Bind Head Screw-Giza 4 X 16 MFZN2BL (V6396400)

[160A]

[160A] [160A]

[150]

[160A]

[160B]

[70]

30cm Speaker

[100]

[110][110]

[80b]

RedBlack

Horn Driver

Red marking

Yellow Blue

[110]

[150]

[150] [150]

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MS300

9

AMP 110A Bind Head Tapping Screw-B 3.0 X 12 MFZN2BL (VQ074600) 10

Circuit Board

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

MIX3/3 110B Bind Head Tapping Screw 3.0 X 12 MFZN2BL (VQ074600) 2

Circuit Board

130A Bonding Screw-B 3.0 X 8 MFZN2BL (VN413300) 2

150 Bind Head Screw A4.0 X 8 MFZN2BL (VP156800) 1

MIX2/3 130B Bonding Screw-B 3.0 X 8 MFZN2BL (VN413300) 6

Circuit Board

Hexagonal Nut 1

MIX1/3 170 Knob MX-GREEN/D-GRAY (VU860200) 2

Circuit Board

180 Knob ORANGE/D-GRAY (VV625800) 2

190 Knob RED/D-GRAY (VU860400) 1

220 Button 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 Procedure 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]: 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 Name Ref No. Description QTY

[100]

Hexagonal nut

[110B]

[170]

[180]

[220]

[190]

[130B]

[110A] [110A]

1/3

[140]

[120]

[130A][150]

AMP

MIX

2/3MIX

3/3MIX

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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 marked [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

)

NJM4580L

(

XF195A00

)

Operational Amplifier

MIX: IC101,IC103,IC104,IC105,

IC106,IC107,IC108

MIX: IC102

1

A

2345678

IN V

+

IN

OUT

AAA

+

VIN

+

IN OUT

BBB

+

B

+

[10g]

[10f]

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MS300

11

CIRCUIT BOARDS

AMP Circuit Board

Component side

3LP-X0155A0

Notes: VR201, VR202: Idling Adjustment VR.

Note: See parts list for details of circuit board component parts.

CN203: to Woffer (1,2pin)

CN201: to MIX 1/3-CN103 CN202: to Transformer

CN203: to Tweeter (3,4pin)

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MS300

AMP Circuit Board

Pattern side

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MS300

13

to Transformer

AC IN

POWER

ON/OFF

to MIX 1/3-CN102

to MIX 2/3-CN101

to AMP-CN201

+4dB -50dB

PARALLEL

LINE MIC

EQ LOW

LIVE LEVEL MIC LEVEL MASTER LEVEL

EQ HIGH

POWER

3LP-X0367A0

MIX1/3 Circuit Board

MIX2/3 Circuit Board

Component side

MIX3/3 Circuit Board

Component side

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14

MS300

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)

5) MASTER LEVEL: MAX(10)

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 +25±1dBu. Also, check

that the primary side power consumption at this time

is 110±20W.

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 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.

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MS300

15

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-20dBusignals 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) EQ high change characteristics

Input a 5kHz, -20dBu signal to the input terminal

LINE INPUT (XLR), move the EQ highVR 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): -3.2dB ±1dB

9) EQ low change characteristic

Input a 50kHz, -20dBu signal to the input terminal

LINE INPUT (XLR), move the EQ lowVR 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).

MIN(-10): -7.5dB ±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

25 ±1dBu.

11) Protection circuit

Apply DC+5V (power supply output resistance = 10

kohm) between Pins 1 and 2 of the connector CN209

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 +6.2±1.5dB --

1k 0dB -25.5±1.5dB

2k -6.1±1.5dB -7.5±1.5dB

15k -- +1.4±1.5dB

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16

MS300

• Finished product inspection

1. 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)

2. Inspection

1) Input a 20Hz to 20kHz, 0.08Vrms(-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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N.C

REGULATOR +15

REGULATOR -15

N.C

to MIX 1/3

-CN103

Tweeter

Woffer

to POWER TRANSFORMER

AMP

common

D10XB20 (V2954200)

DIODE STACK

NJM7815FA(XD853A00)

REGULATOR +15V

1

2

3

1: OUTPUT

2: COMMON

3: INPUT

NJM7915FA(XD854A00)

REGULATOR -15V

1

2

3

1: OUTPUT

2: INPUT

3: COMMON

6

5

4

3

HFGEDCBA

A HGFEDCB

1

2

38CC1-8821567

MS300 OVERALL CIRCUIT DIAGRAM 1/2 (AMP)MS300

MS300MS300

Note : See parts list for details of circuit board component parts.

: Mylar Capacitor

: Ceramic Capacitor

: Mica Capacitor

: Metal Film Resistor

: Metal Oxide Film Resistor

: Flame ProofC. Resister

Capacitor

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2/3MIX 1/3MIX

3/3MIX

OP AMP

OP AMP OP AMP OP AMP OP AMP OP AMP

OP AMP

OP AMP OP AMP

-CN202

TRANSFORMER

POWER ON/OFF to AMP

-CN201

to AMP

Common 2

38CC1-8821566

MIC IN

MIC LEVEL

LINE LEVEL

MASTER LEVEL

LOW

HIGH

POWER

LINE OUT

LINE IN [PHONE]

LINE IN

X0169A00

X0170A00

X0171A00

X0172A00

6

5

4

3

1

2

HAB GFCDE

A HGBC FED

MS300 OVERALL CIRCUIT DIAGRAM 2/2 (MIX 1/3,2/3, 3/3)MS300

MS300MS300

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PARTS LIST

CONTENTS

OVERALL ASSEMBLY .............................................. 2

AMPLIFIRE ASSEMBLY ................................. 4

ELECTRICAL PARTS ............................................. 6

WARNING

Notes : DESTINATION ABBREVIATIONS

The numbers “QTY” show quantities for each unit.

The parts with “--” in “PART NO.” are not available as spare parts.

This mark “}” in the REMARKS column means these parts are interchangeable.

The second letter of the shaded ( ) part number is O, not zero.

The second letter of the shaded ( ) part number is I, not one.

M: South African model

O: Chinese model

Q: South-east Asia model

T : Taiwan model

U : U.S.A. model

V : General export model (110V)

W: General export model (220)

N,X: General export model

Y : Export model

A : Australian model

B : British model

C : Canadian model

D : German model

E : European model

F : French model

H : North European model

I : Indonesian model

J : Japanese model

POWERED SPEAKER

MS300

Components having special characteristics are marked and must be replaced with parts having

specification equal to those originally installed.

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MS300

2

AMPLIFIRE

ASSEMBLY

(See page 4)

200

150

160

210

30

130

10

10f 10b

10a

120

100

20

20c

20b

20a

110

90

50

80

80a

10h

70

60

40

160 190

220

170

180

10i

190d

190c

190a

190b

10e

10g

10c

10d

OVERALL ASSEMBLY

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Yamaha MS300 User manual

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