Yamaha NS-P270 Manuel utilisateur

SERVICE MANUAL

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.

IMPORTANT NOTICE

101000

SERVICE MANUAL

NS-P270/NS-P276

HOME CINEMA 5.1CH SPEAKER PACKAGE/

HOME CINEMA 6.1CH SPEAKER PACKAGE

NS-P270/NS-P276 consists of the NX-E270, NX-C270 and the SW-P270

■ CONTENTS

TO SERVICE PERSONNEL . . . . . . . . . . . . . . . . . . . . 2

FRONT PANELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

REAR PANELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–4

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 4–6

SW-P270 INTERNAL VIEW . . . . . . . . . . . . . . . . . . . . 6

SW-P270 DISASSEMBLY PROCEDURES . . . . . . . . 7

SW-P270 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . 8

SW-P270 PRINTED CIRCUIT BOARD . . . . . . . . . . . . 9

SW-P270 SCHEMATIC DIAGRAM . . . . . . . . . . . . . . 10

REPLACEMENT PARTS LIST . . . . . . . . . . . . . . 11–15

NS-P270

NS-P276

This manual is copyrighted by YAMAHA and may not be copied or

redistributed either in print or electronically without permission.

‘06. 01

NS-P270/NS-P276

NS-P270

NS-P276

▼ SW-P270

■ FRONT PANELS

■ 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.

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.

●Meter impedance should be equivalent to 1500 ohms shunted

by 0.15µF.

●Leakage current must not exceed 0.5mA.

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

polarities.

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.

x4 for (NS-P270)

x5 for (NS-P276)

▼ NX-C270 ▼ NX-E270

AC LEAKAGE

TESTER OR

EQUIVALENT

EQUIPMENT

UNDER TEST

INSULATING

TABLE

WALL

OUTLET

NS-P270/NS-P276

NS-P270

NS-P276

NS-P270

NS-P276

▼ SW-P270 (U, C models) ▼ SW-P270 (T model)▼ SW-P270 (R model)

▼ SW-P270 (A model) ▼ SW-P270 (B, G models)▼ SW-P270 (K model)

■REAR PANELS

POWER INDICATOR

POWER INDICATOR POWER INDICATOR

POWER INDICATOR

POWER INDICATOR POWER INDICATOR

NS-P270/NS-P276

NS-P270

NS-P276

▼ SW-P270 (L model) ▼ NX-C270 ▼ NX-E270

■ SPECIFICATIONS

●NX-E270

Type ........................................ 2-way acoustic suspension

Magnetic shielding type

Driver

Woofer ....................................... 8 cm (3-1/8”) cone x 1

Tweeter .................... 1.9 cm (3/4”) balanced dome x 1

Frequency Response ............................ 100 Hz to 25 kHz

Impedance ........................................................... 6 ohms

Nominal Input ........................................................... 30 W

Maximum Input ......................................................... 80 W

Sensitivity ................................................ 85 dB/2.83 V/m

Crossover Frequency ........................................... 12 kHz

Input Terminal .................................................. Push type

Dimensions (W x H x D) .... 105 mm x 151 mm x 113 mm

(4-1/8” x 5-15/16” x 4-7/16”)

Weight .............................................. 0.8 kg (1 lbs. 12 oz.)

Finish

Black color ........................... U, C, R, A, B, G, L models

Silver color ...................U, C, R, T, K, A, B, G, L models

Appropriate Speaker Stand ............................. SPS-80S

●NX-C270

Type .................................. Full-range acoustic suspension

Magnetic shielding type

Driver .................................................... 5 cm (2”) cone x 2

Frequency Response ............................ 130 Hz to 20 kHz

Impedance ........................................................... 6 ohms

Nominal Input ........................................................... 30 W

Maximum Input ....................................................... 100 W

Sensitivity ................................................ 85 dB/2.83 V/m

Input Terminal .................................................. Push type

Dimensions (W x H x D) ...... 300 mm x 72 mm x 113 mm

(11-13/16” x 2-13/16” x 4-7/16”)

Weight ......................................................... 0.9 kg (2 lbs.)

Finish

Black color ...........................U, C, R, A, B, G, L models

Silver color ................... U, C, R, T, K, A, B, G, L models

POWER INDICATOR

NS-P270/NS-P276

NS-P270

NS-P276

NS-P270

NS-P276

U ....... USA model

C ....... Canadian model

R ....... General model

T ....... Chinese model

K ....... Korean model

●SW-P270

Type .............. Advanced Yamaha Active Servo Technology

Magnetic shielding type

Output Power ............ 50 W (100 Hz, 5 ohms , 10 % THD)

Dynamic Power..........................................100 W, 5 ohms

Input Impedance .......................... INPUT (PJ): 12 k-ohms

Frequency Response ............................. 30 Hz to 200 Hz

Driver

Woofer ................................... 16 cm (6-5/16”) cone x 1

Input Section ................................................ RCA pin jack

Operation Section ............. Power switch, Volume control,

Power indicator

Power Supply

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

R, T, K, L models ..... AC 110–120/220–240 V, 50/60 Hz

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

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

Power Consumption

U, C, R, T, K, A, B, G, L models ............................ 40 W

Dimensions (W x H x D) .... 200 mm x 365 mm x 370 mm

(7-7/8” x 14-3/8” x 14-9/16”)

Weight ............................................ 8.5 kg (18 lbs. 12 oz.)

Finish

Black color ........................... U, C, R, A, B, G, L models

Silver color ................... U, C, R, T, K, A, B, G, L models

●Accessories

NS-P270.................................... Subwoofer cable (3m) x 1

Nonskid pad x 4 (for SW-P270)

Speaker cable (10 m) x 2

Speaker cable (4 m) x 3

Nonskid pad x 16 (for NX-E270)

Fastener x 2 (for NX-C270)

NS-P276..................................... Subwoofer cable (3m) x 1

Nonskid pad x 4 (for SW-P270)

Speaker cable (10 m) x 3

Speaker cable (4 m) x 3

Nonskid pad x 24 (for NX-E270)

Fastener x 2 (for NX-C270)

* Specifications subject to change without notice.

●DIMENSIONS

Advanced YST

Advanced Yamaha Active Servo Technology is a

unique system to let the speaker unit have a perfectly

linear motion by the speaker and amplifier

combination.

Unit : mm (inch)

300 (11-13/16”) 113 (4-7/16”)

72 (2-13/16”)

105 (4-1/8”) 113 (4-7/16”)

151 (5-15/16”)

70 (2-3/4”)

Holes

A screw with a diameter of

4 mm (5/32”) can be used.

[Hole depth: 10 mm (13/32”)]

Unit : mm (inch)

▼ NX-C270

▼ NX-E270

A ....... Australian model

B ....... British model

G ....... European model

L ....... Singapore model

NS-P270/NS-P276

NS-P270

NS-P276

▼ SW-P270

200 (7-7/8”) 370 (14-9/16”)

335 (13-3/16”)

365 (14-3/8”)

Unit : mm (inch)

■ SW-P270 INTERNAL VIEW

qMAIN (2) P.C.B.

wMAIN (1) P.C.B.

eMAIN (3) P.C.B.

rPOWER TRANSFORMER

NS-P270/NS-P276

NS-P270

NS-P276

NS-P270

NS-P276

1. Removal of Front Grille Ass’y

The Front Grille Ass’y is fixed to the cabinet with

dowels at 6 locations. As a flatblade screwdriver is

used for removal, use special care not to cause

damage to the cabinet Ass’y.

a. Using the flatblade screwdriver inserted in the gap

between the Front Grille Ass’y and the cabinet

Ass’y (bottom side first), push up the Front Grille

Ass’y (Fig.1).

b. Remove the Front Grille Ass’y by lifting a

metalblade up (Fig.1).

* When installing the Front Grille Ass’y, apply quick-

drying bond to the dowels and then fit them into dowel

holes for secure installation. (The Front Grille Ass’y

will come off easily if its dowels are fitted into dowel

holes only.)

2. Removal of Rear Panel Ass’y

Remove 14 screws (1) (Fig.2).

* Arrow marks ( ) are printed to identify the screws to

be removed.

* When assembling the Rear Panel Ass’y, check to

ensure that the packing is not damaged so as to

prevent air leakage from occurring.

■ SW-P270 DISASSEMBLY PROCEDURES

(Remove parts in disassembly order as numbered.)

Disconnect the power cable from the AC outlet.

Front Grill Ass’y

Cabinet Ass’y

Rear Panel Ass’y

Metal blade

Flatblade

screwdriver

Fig.1 Fig.2

NS-P270/NS-P276

NS-P270

NS-P276

■ SW-P270 BLOCK DIAGRAM

IC1B IC7A

VR1

VOLUME

L.P.F.

6dB/oct

H.P.F.

12dB/oct

L.P.F.

12dB/oct

575

7IC7B

IC4

Q10, 11, 12, 13

A.N.I.C

LIMITER

RY 1

312

IC2

D14, 15, 16

Q3, 4, 5, 8

D9, 10, 11, 12

–B

0.1

PROTECTION

+12

–B

–12

REGULATOR

POWER SUPPLY

Q1, D6

Q2, D7

POWER

SW2

DRIVER

INPUT

–

POWER

AMP

ABCDEFGH

NS-P270/NS-P276

■SW-P270 PRINTED CIRCUIT BOARD

P. C. B. MAIN (2)

P. C. B. MAIN (1)

P. C. B. MAIN (3)

POWER CABLE

POWER

DRIVER

INPUT

VOLUME

POWER

INDICATOR

WHBE

R, T, K, L models

1678 2

18 2

U, C, A, B, G models

14 BR

110–120V

220–240V

WHSW1

Circoic No. U.C R T KABGL

F1 ✕˛˛˛✕✕✕˛

SW1 ✕˛˛˛✕✕✕˛

C50 ✕✕✕˛✕˛˛✕

ABCDEFGH

NS-P270/NS-P276

-11.6

000

0.2

11.7

1.9

1.3

0.1

-32.0 -1.1 -33.0

32.9

0.2

11.7

-11.0

-1.00

11.7

-11.0

0.1

-1.5

0.1

11.7

-11.7

0.1

0.1 0.1

0.1

0.10.1

0.1

-9.9

1.31.3

0.3

1.3

0.8

0.1

0.1 0.1

0.1

-11.6

-12.2

0.1

12.3

+12.3

11.731.3

-31.5

32.9-33.0

AC48.9 V

-31.6

INPUT

MAIN (2)

MAIN (3)

POWER

U, C, A, B, G models

R, T, K, L models

MAIN (1)

DRIVER

VOLUME

POWER INDICATOR

IC4 : STK404-050

Power Amp

112345678910

R1 R4

C1 C2

TR3

TR5

R3 R6

TR4

SUB

TR1 TR2

TR6

TR7

TR8

IC1, 2, 7 : KIA4558P

Dual OP-Amp

–+

OUT

–IN

–V

OUT

+IN

–IN

+IN

–+

■SW-P270 SCHEMATIC DIAGRAM

* All voltages are measured with a 10M

Ω

/V DC electronic volt meter.

* Components having special characteristics are marked

and must be replaced with parts having

specifications equal to those originally installed.

* Schematic diagram is subject to change without notice.

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