Yamaha mx 1000 u

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STEREO POWER AMPLIFIER

MX-1000/ U

SERVICE MANUAL

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 inherant to the industry, and more specifically Yamaha
Products, are already known and understood 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 personal iniury, 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 Vamaha Retailer or the
appointed service representative.

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IMPORTANT: The presentation or sale of this manual to any individual or firm does not constitute
authorization, certification or recognition of any applicable technical capabilities, or
establish a principleagent relationship of any form.

The data provided is believed to be accurate and applicable to the unit(si indicated on the cover. The

research, engineering, and service departments of Yamaha are continwally striving to improve Yamaha

products Modifications are, therefore, inevitable and specifications are subject to change without notice or

obligation to retrofit. Should any discrepancy appear to exist, please 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 buss in the unit (heavy
gauge black wires connect to this buss).

IMPORTANT: Turn the unit OFF during disassembly and parts replacement. Recheck all work before
you apply power to the units

I CONTENTS

TOSERVICE PERSONNEL. . I DISASSEMBLY PROCEDURES . . . ........ . .. 5
1 SPECIFICATIONS... 1 ADJUSTMENTS ...... . ...... 5
FRONTPANELS................. ....... 2 PRINTEDCIRCUITBOARD.............6~13
REARPANELS. ......... .............3 SCHEMATICDIAGRAM..................14
I BLOCKDIAGRAM......................4 WIRING..... .......... ..... 15
INTERNALVIEW ....... ...... 4 PARTSLIST... ........... .t.......16~24

@l Y/éMAHA CORPORATION

80x1 Hamamaisu Japan
1 man Hi can Printed in Inna-n 5 A

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MX-l coo/u

I TO SERVICE PERSONNEL

1. Critical Components Information.
I Components having special characteristics are marked A
and must be replaced with parts having specifications equal

to those originally installed.
AC LEAKAGE TESTER

OR EQUIVALENT

If)

I:
INSULATING TABLE

EQUIPMENT
2. Leakage Current Measurement (For 120V Model Only). UNDER TEST
When service has been completed, it is imperative that you
verify that all exposed conductive surfaces are properly ®

insulated from supply circuits.

0-

. Meter impedance should be equivalent to 150!) ohm shunted

W
by 0.15MF. ALL

OUTLET
o Leakage current must not exceed 0.5mA.
0 POLARIZATION (U, C models only)

This amplifier product is equipped with a polarized alternat-
ing current line plug [a plug having one blade wider than the
other ). This plug will fit into the power outlet only one way.

0 Be sure to test for leakage with the AC plug in both polarities,

I SPECIFICATIONS

This ia a safety feature.

Minimum HMS Output Power per Channel

Power Consumption

20H: ~ 20kHz 1100w, 1300VA (U, c)
0.003% THD,8I1 260W 850W (H)
0.007% THD, en 295w new (A, B, G)
002% THD, 411 330w Ac Outlet

Un Switched x 1

200W max. (U, C, Fl)

3 Dynamic Power per Channel
"at (by IHF Dynamic Headroom measuring method) Dimensions (W x H x D) 435 x 170 x 425mm
0 8n 450W I17-1/8"x6-11I16"X
0 an. 560W 16-3/4")
2' :2 57;}ng Weight 20.5kg (45 lbs 4 oz)
>< 19' IOOOW Specifications are subject to change without notice.
2 DIN Standard Output Power per Channel
1kHz, 1% THD, 49 450W (G) U.S.A..Mode/
Dynamic Headroom United/an Model
2.38dB (U, C, Ft) Australian Model
an 2.78dB (U, C, R) British Model
40 3.51 dB (u, c, R) European Model
lsc Power IlkHz, 0.01% THD) I) " " 6"93 MM
89. 315W (G)
69 375W (G)
An 440W (G)
Power Band Width . DIMENSION
0.03% THD, 130W, 89 10k Hz ~60kHz
Dumping Factor 3
Sn, 1kHz 130 m:
Input Sensitivity/Impedance
MAIN IN 1.62V/60kn Fl FIR FIFI Fl
Frequency Response (20H: ~ZDkHzI
MAIN IN +0, -0.2dB
Total Harmonic Distortion
20Hz ~ 20kHz
MAIN IN TO SP OUT (1soW/3n) 0.003%
lntarmodulation Distortion ..
Rated Output /852 0.003% '3
Signal to Noise Ratio IlHF-A Network) 'I
MAIN IN (shorted) 126dB g
MAIN IN (5.1M). terminated) 122dB o
Residual Noise (IHF-A Network) 21w 3
Channel Separation (Vol. -30dB)
Input shorted (1kHz/10kHz) 39dB/72dB
Power Supply
A0220/24OV, 50H2 IB,G) fi' L, ._. ..
AC1 10/ 1 20/220/240 in
v, 50/60H2 (R) s;
\ ACZdOV, 50H: (A)
AC120V, 60H: (U, C) r
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an. o o é
El - - w 3
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435(17-l/e l E
Unit: mm (inch)