Yamaha MX-2000 Service manual

ERE0 POWER AMPLIFIER

f

IMPORTANT

This manual has been provided for the use of authorized Yamaha Retailers and their service personnel.

It has been

Products, are already known and understcad by

WARNING:

IMPORTANT:

The

research, engineering, and service departments of

products. Modifications

obligation to retrofit. Should any discrepancy appear

Division.

WARNING:

IMPORTANT:

assumed that basic service procedures inhennt to the industry, and more specifically Yamaha

Failure to follow appropriate service and safety procedures when servicing this product may result in product rhat all sewib~ required should appointed service representative.

The presentation or sale of this manual authorization, certification establish a principle-agent relationship of any form.

data provided is believed

Static discharges can destroy expensive components. Discharge any staticelectricity your body may have accumulated by grounding yourself to the ground buss in gauge black wires

Turn the unit OFF during d~sassembly and parts replacement. Recheck all work before you apply

personal injury, destruction of expensive Eamponentr

to

perform as specified. For these reasons,

or

to

be accurate and applicable to the unit(s) iddftxtted

are,

therefore, inevitable and specifications are subjectt~

c~lncct

to

this buss).

power

to

the unit.

NOTICE

the

users,

and

have therefore not been restated.

and

we

be

performed by an authorized Yamaha Retailer or

to

remgnitidn of any appllcaMe technical aapabillties,

Yamaha are continually striving

to

exist, please contact the distributor's Servim

advise all Yamaha product ownel

any individual or firm does not ~onstitute

chaage

failure of the

an

the

wver.

to

imptwe Yamaha wi&out notice or

the

unit (heavy

th

or

The

CONTENTS

TO SERVICE PERSONNEL

FRONTIREAR PANELS SPECIFICATIONS BLOCK DIAGRAM

INTERNAL

.......................

......................

VIEW..

DISASSEMBLY PROCEDURES

.................

...................

.....................

L

..............

-

- -

1 ADJUSTMENTS

........................

1 PRINTED CIRCUIT BOARD

2

2 WIRING..

3

SCHEMATIC DIAGRAM

...........................

PARTSLIST..

....................

..................

4

1.35K-604

.............

liq@

YAMAHA

PO.Box

Printed

CORPORATION

1.

Harnarnatsu.

in

Japan

5

-

10

11

12-20

Japan

'88.8

4

9

IT0 SERVICE PERSONNe'

1. Critical Componentr Information. Components having special characteristics

and

murt be replaced with parts having specifications equal

those originally installed.

to

2. Leakage Current Measurement When service has been completed. verify that all exposed conductive surfaces are properly insulated from

Meter impedance should be equivalent to 1500ohm shunted by 0.151iF. OUTLET

Leakage current murt not exceed 0.5mA.

Be

sure

I

FRONT/REAR PANELS

supply circuits.

to test for leakagewith the AC plug in bath polarities.

(Far

12OV Model Only).

it

are

marked

ir imperative that you

A

WALL

EQUIPMENT AC LEAKAGE TESTER

+UNDER

-

INSULATING TABLE

POLARIZATION

This amplifier product ing current line plug

).This plug will fit into the power outlet only one way.

other

a

safety

This ia

feature.

TEST

,

JlvALENT

-

is

equipped with a polarized alternat-

(a

plug having

one

blade wider than the

,

SPECIFICATIONS

Mlnlmum RMS Output Pow

20Hz -20kHz

0.006% THO, 8S2 13W+ 130W

0.005% THD, 651 16(IW+lSMN

0.01% THD, 4n

Dynamic

(by

Pomr

Dmpinq

Iwut San$itiuihl/lmpedama

Fm(uncy R.rpons

Total Harmonic DMonion IZOHz -ZOkHz)

Siil

RriduJ Noise (IHF-A-Network) 1 5@V

Chonlrl Sopantion

Powor

Powa

AC OvNR Dimwlon

WaIglu 28kg I61 lbs 11

*~mot~on:

Pomr

per

Width

TO

x H x

SP

OUT,

m

ubbt

.-

U.S.A.

...

DWm

Channel

D)

IHF Dqnmlc Hredrmom mesrurinO method)

8&2 180W

6n

4n 34ow

zn

~n

Eand

OM% THD, 65W. 80 1OHz -100kHr

Factor

1 kHz, 8n MAIN IN 130W,8&2 1 2mV120kn 20Hz -2OkHz. MAIN IN

MAIN

IN

to Noise Ratio (IHF-A-Nwork)

MAIN IN (Shorted) 126dB

IkHz, Input Shorted, Vol.

SUPMY

Consumption 880W

Un

Sw~tched x 1

(W

IUI ICI

par

Chnnrl

18OW+180W

24w 49w

mw

loo0

+O,

-0.3dB

130~, 8n 0.005%

max.

m

dmm

Modal

hl&

96d6

ACIMV, WHz

WOW

473 x 170 x 469mm

1185/8"x6-11/16

x

187/16"l

without

notice.

max.

or)

DIMENSION

_1

-

--

-

io

.

-

o

:

-?!

3

'P

-

Unit: mm (inch)

BLOCK DIAGRAM

INPUT

ANm

PW

LEVa

MLTH

ALP

P101,103.ID5.107

METER

PrnTECTlON

0%-Zm

*=

UNSWITCHEO

SP

otr

D301.302

.INTERNAL VIEW

TOP

VlEW

0

ELECTRICAL CAPACITOR:

22000pF 80V x 2

OINPUTCIRCUIT BOARD:

VOLTAGE AMP SECTION ERROR CORRECTION SECTION

@MAIN CIRCUITBOARD (Lch):

H.C.A. POWER STAGE

@POWER TRANSFORMER

U

model : XE669001

C model : XE670001

@MAIN CIRCUIT BOARD (Rch):

H.C.A. POWER STAGE

81

DIRECT

BOTTOM

VlEW

@POWER SUPPLY CIRCUIT BOARD (2):

OUTPUT COIL

POWER SUPPLY CIRCUIT BOARD (11:

POWER SUPPLY SECTION

(*

B1.f BZandiB3)

&PROTECTION CIRCUITSECTION

@METER CIRCUIT BOARD

81

OUTPUT ERROR

(1)

-

--

DISASSEMBLY PROCEDURES

(Remove parts in disassembly order as numbered.)

1. Removal of Top Cover Remove 11 screws

2.

Removal of Bottom Cover Remove 24 screws

3.

Removal of Wood Panel Ass'y Remove 8 screws

4.

Removal of Front Panel Remove 4 screws Fig. 1.

( @ )

(

@

(

@

Ass'y

in Fig.

1.

in Fig. 1.

)

in Fig. 1.

)

and plastic rivet

( @ )

in

8

Q

Fig.

1

-

ADJUSTMENTS

Idling Adjustment

1) Remove the wood panel assembly.

2) Adjust VR201 between board becomes

VR201

(both L and R) so that the voltage

test

pins TP1 and TP2 in the main circuit

DCGOmV + 590mV.

Main Circuit Board

TPl

I

TP2

Meter Adj~ Connect a

1)

.

,.

2)

Aalusr

meter indicator reads OW with no signal applied.

3) Apply 1kHz sine wave signal to INPUT and set the signal level so that both ends of the dummy load.

4)

Adjust VR401 meter indicator reads 1OOW.

Recheck

5) signal appl

ustment

. .

,.

-.--

vnrud

t

hat the m

ied and

8.9

dumm

y load.

,.

IL

ch) and VR404 (R ch) so that

28.3Vrms voltage

(L

ch) and VR402 (R ch) so that the

eter indicator reads OW with no

adj

iust again if necessary.

lvlerer Circuit Board

is

obtained at

1

,

=

.PRINTED CIRCUIT BOARD (Pattern side)

Note)

ZTEi

:

Component ride

I

Main Circuit Board

(L

channel

is

the same as R channel)

1

FROM

:POWER SUPPLY

I

I)

TO : POWER SUPPLY

(

I)

a

TO :POWER SUPPLY

(2

TO : POWER SUPPLY

(

I)

%WER

.:

SUPPLY

(1

1

FROM : POWER

SUPPLY

(1

1

ER

SUPPLY

(31

PROTECTION POWER SPEAKERS

FR0M:PQWER

SUPPLY

OFF

L

METER

Meter

Lch

Circuit

Board

J

(2)

-

(1)-

C