Yamaha eq 550

Page 1

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Noise Fluent 5 dB 1 3

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you apply power to the unit.

IMPORTANT NOTICE ,

This manual has been provided for the use of authori7etl Yamaha Remilers 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 resuated.

WARNING: Failure to follow appropriate service and safety procedures when servicing this product
may result in personal 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:,The presentation or sale of this manual to any individual or firm does not constitute
authoritation, certification, recognition of any applicable technical capabilitites, or
establish a principle-agent relationship of any form.

The data provided is believed to be accurate and applicable to the unitlsi indicated on the cover. The
research, engineering and service departments of Yamaha are continually striving to improve Vamaha
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 distributor's Service

WARNING: Stalic 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

I CONTENTS

TO SERVICE PERSONNEL

WARNING: CHEMICAL CONTENT NOTICE! BLOCK DIAGRAM
SPECIFICATIONS ADJUSTMENTS
DIMENSIONS

DESCRIPTION OF OPERATIONS
REAR PANELS
INTERNAL VIEW

1
1
1
1 WIRING
2
3

PRINTED CIRCUIT BOARD.
SCHEMATIC DIAGRAM
PARTS LIST.

DISASSEMBLY PROCEDURES

YAMAHA

YgMAHA CORPORAITON
OBOx1, Hamamatsu. Japan

3.05K-131 III@ Printed in Japan 90.!)

OSS'OEI

Page 2

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I TO SERVICE PERSONNEL

1. Critical Components Information.
Components having special characteristics are marked
and must be replaced with parts having specifications equal,
to those originally installed.

2. Leakage Current Measurement (For 120V Model Only).
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 1500 ohm shunted
by 0.15uF.

item

0 Be sure to test for leakage with the AC plug inEOthZfanties.

C Leakage current must not ex

EQUIPMENT

UNDER-TEST OFI EQUIVALENT

,an F
WALL :l = ~ ~
°UTLET INSULATING TAeLE- '

Ac LEAKAGE TESTER

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.

I SPECIFICATIONS?

Input Sensitivity/Impedance

LINE IN, TAPE, 1 kHz ................ 1V/47k-ohms
MIC .............................. 0.3 mV/47k-ohms
Rated Output/Impedance
LINE OUT, REC OUT, 1 kHz
(OUTPUT LEVEL -~ Max.) ............ 1V/600-ohms
Frequency Response ................. 10 Hz - 35 kHz,
:tO.5 dB
Center Frequencies ............. 30 Hz, 60 Hz. 120Hz,

240 HZ, 4801Hz. 1 kHz, 2 kHZ.
4 kHz, 8 kHz. 16 kHz,

Equallzer Control Flange ..................... i1 2 dB
Signal-to-Nolse Ratio (Input short, IHF A Network)

At 1V output ...................... More than 105 dB
Total Harmonic Distortion

(1 kHz, 1V output) .. .......... Less than 0005%
Maximum Output (20 Hz - 0 kHz) ..... More than 7V
Subsonlc Fllter Cutott '

Frequency........; ........................... 15Hz

(1 2 dB/ Oct)

Pink Noise Output ....................... 150 mV RMS
Display ................................... 10 bands

Switchable between L or R. L + R
Power Requirements

General model ....... 110»i20/220-240V. 50/60 Hz

Europe modél .......................... 220v, 50 Hz
Australia and U.K. models .............. 240V. 50 Hz
U.S.A. and Canada models .. 120V. 60 Hz
Power Consumption ............................. 15W
Dimensions (W _x H x D) .......... 435 x 102 x 232 mm

(17-1/ X 4" X 9-1/8")

Weig hI .......

.................. 3.7 kg (8 lbs. 2 oz.)

Accessorles .......... Pin plug cords (2)
MM-11D Electret Condenser Mic

Mic stand

Dry battery AA (R06) type (1)

* Specifications subject to change without notice.

(U) ..U.S.A. model (G) ....European model
(C) ..Canadian model (B).....British model
(A) .....Australian model (R) ..... General model
I DIMENSIONS 65,,
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88.2(37/16")

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