DP-U50.pdf

DP-U50

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 inherent 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

injury, destruction of expensive components, and failure of the product to perform as specified. For these

reasons, we advise all YAMAHA product owners that any 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 authorization, certification

or recognition of any applicable technical capabilities, or establish a principle-agent relationship of any

form.

The data provided is believed 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 specifications 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 buss in the unit (heavy gauge black wires connect to this

buss).

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

unit.

CONTENTS

TO SERVICE PERSONNEL ........................................... 1

FRONT PANEL ............................................................... 2

REAR PANELS ............................................................... 2

SPECIFICATIONS ........................................................... 3

INTERNAL VIEW ............................................................ 4

DISASSEMBLY PROCEDURES .................................... 4

SELF DIAGNOSIS FUNCTION ............................... 5 – 13

STANDARD OPERATION CHART .............................. 14

IC DATA ................................................................ 15 – 24

DISPLAY DATA ............................................................ 25

BLOCK DIAGRAM ................................................ 26 – 27

PRINTED CIRCUIT BOARD ................................. 28 – 35

IC BLOCK ............................................................. 36 – 37

SCHEMATIC DIAGRAM ....................................... 38 – 39

PARTS LIST .......................................................... 40 – 49

REMOTE CONTROL TRANSMITTER .......................... 50

PARTS LIST FOR CARBON RESISTORS .................. 51

100736

PERSONAL SOUND PROCESSER

DP-U50

TO SERVICE PERSONNEL

1. Critical Components Information

Components having special characteristics are marked Z

and must be replaced with parts having specifications equal

to those originally installed.

WALL

OUTLET

EQUIPMENT

UNDER TEST

AC LEAKAGE

TESTER OR

EQUIVALENT

2. Leakage Current Measurement (For 120V Models Only)

When service has been completed, it is imperative to verify

that all exposed conductive surfaces are properly insulated

from supply circuits.

INSULATING

TABLE

Meter impedance should be equivalent to 1500 ohm shunted

by 0.15 µ F.

Leakage current must not exceed 0.5mA.

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

polarities.

“CAUTION”

“F1 : FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 1.0A, 125V FUSE.”

A V

CAUTION

F1 : REPLACE WITH SAME TYPE 1.0A, 125V FUSE.

ATTENTION

F1 : UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 1.0A, 125V.

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

WHATSOEVER!

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.

DP-U50

FRONT PANEL

REAR PANELS

U, C models

A model

B, G models

DP-U50

SPECIFICATIONS

AUDIO SECTION

GENERAL

Output Level/Impedance

PRE OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.0V/2.0k Ω

SUB WOOFER (50Hz) . . . . . . . . . . . . . . . . . . . . . . 2.0V/1.7k Ω

Input Sensitivity/Impedance

PC, AUX 1, AUX 2 (Analog) . . . . . . . . . . . . 150mV/35k Ω

Maximum Input Signal Level

PC, AUX 1, AUX 2, 1kHz (DSP= THRU) . . . . . . . . . 2.1V

Headphone Jack Rated Output/Impedance

PC Analog Input, etc (1kHz, 150mV) . . . . . . 320mV/61 Ω

Frequency Response

USB to PRE OUT

20Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . -1.0+1.0/-1.0dB

1kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0dB

20kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5+1.0/-1.0dB

PC, AUX Digital Input to PRE OUT

20Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . -1.0+1.0/-1.0dB

1kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0/-0dB

20kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5+1.0/-1.0dB

Total Harmonic Distortion (1kHz, 20k LPF)

USB to PRE OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.01%

PC, AUX Digital Input to PRE OUT . . . . . . . . . . . . . 0.01%

Signal-to-Noise Ratio (IHF-A-Network)

USB to PRE OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . 100dB

PC, AUX Digital Input to PRE OUT . . . . . . . . . . . . . 110dB

Residual Noise (IHF-A-Network)

PRE OUT L/R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 µ V

Power Supply

U, C models . . . . . . . . . . . . . . . . . . . . . . . AC 120V, 60Hz

A model . . . . . . . . . . . . . . . . . . . . . . . . . . . AC 240V, 50Hz

B, G models . . . . . . . . . . . . . . . . . . . . . . . AC 230V, 50Hz

Power Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20W

Standby Power Consumption . . . . . . . . . . . . . . . . . . . . . 8W

Dimensions (W x H x D) . . . . . . . . . . . . . 120 x 294 x 355mm

(4-11/16” x 11-9/16” x 13-15/16”)

Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.0 kg (11 lbs 3oz)

Finish . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Silver color

Accessories . . . . . . . . . . . . Remote Control Transmitter x 1

Battery (size "AA", "R06") x 2

USB Cable x 1

CD ROM x 1

* Specifications subject to change without notice.

U . . . . . . . . . . USA model

C . . . . . .Canadian model

A . . . . . Australian model

B . . . . . . . . British model

G . . . . . European model

DIMENSIONS

Manufactured under license from Dolby Laboratories.

"Dolby", "AC-3", "Pro Logic", and the double-D symbol V

Manufactured under license from Digital Theater Systems,

Inc. US Pat. No. 5,451,942 and other world-wide patents

issued and pending. "DTS", "DTS Digital Surround", are

trademarks of Digital Theater Systems, Inc. copyright

13.5 (1/2")

355 (13–15/16")

Units : mm (inch)

DP-U50

INTERNAL VIEW

DSP P.C.B.

MAIN P.C.B.

OPERATION (1) P.C.B.

OPERATION (2) P.C.B.

DISASSEMBLY PROCEDURES (Remove parts in the order as numbered.)

1. Removal of Top Cover

Remove 14 screws ( q and w ) and then remove the

Top Covers in Fig. 1.

2. Removal of Front Panel

Remove 6 screws ( e ) and then remove the Front

Panel in Fig. 2.

3. Checking the DSP P.C.B.

Remove 4 screws ( r ) and then remove the Shield

Case in Fig. 2.

Top Cover

Top Cover (L)

Front Panel

Top Cover (R)

Shield Case

Fig. 1

The shield case can be removed only by

loosening these 2 screws marked ( r ).

Fig. 2

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