Sony str k 990 service manual

Page 1

STR-K990

SERVICE MANUAL

Ver. 1.0 2007.03

- STR-K990 is the tuner and the amplifier section

in HT-DDW990.

US Model
Canadian Model

This receiver incorporates Dolby* Digital and Pro Logic Surround and

the DTSM Digital Surround System.

* Manufactured under license from Dolby Laboratories.
Dolby", Pro Logic" and the double-D symbol are trademarks of

Dolby Laboratories.

** DTS and DTS Digital Surround are registered trademarks of

DTS, Inc.

AUDIO POWER
SPECIFICATIONS

POWER OUTPUT AND TOTAL
HARMONIC DISTORTION:

(Models of area code US only)

With 6 ohm loads, both channels driven, from
120 7 20,000 Hz; rated 90 watts per channel
minimum RMS power, with no more than 1%
total harmonic distonion from 250 milliwatts
to rated output.

Amplifier section

Power Output

Stereo mode (6 ohms, 1 kHz, THD 1%)
90 W + 90 W

Surround modez) (reference) (6 chins, 1 kHz,

THD 10%)
RMS output
FRONT: 140 W
per channel
CENTER: 140 W
SURROUND: I40 W
per channel

Sony Corporation
Home Audio Division

9-887-508-01
20070161
© 2007.03

Published by SonyTechno Create Corporation

SPECIFICATIONS

lIMeasured under the following conditions:
Area code
US, Canadian

Power requirements
120 V AC. 60 Hz

2IReferenoe power output for front, center and
surround speakers. Depending on the sound field
settings and the source, there may be no sound
output.

Inputs

Analog Sensitivity: 800 mV/
50 kohms
Digital (Coaxial) Impedance: 75 ohms
Outputs (Analog)
AUDIO OUT Voltage: 800 mV/
10 kohms
SUB WOOFER Voltage: 2 WI kohm
Tone
Gain levels :6 dB, 1 dB step
Reproduction frequency range:

28 7 20,000 Hz

FM tuner section
Tuning range
Antenna

87.5 - 108.0 MHz
FM wire antenna

75 ohms, unbalanced
Intermediate frequency

10.7 MHZ

Antenna terminals

AM tuner section
Tuning range
With lO-kI-Iz tuning scale:
530 7 1,710 kHz
With 9-kHz tuning scale:
5317 1,710 kHz
Loop antenna
Intermediate frequency
450 kHz
3IYou can change the AM tuning scale to 9 kHz or
10 kHz. After tuning in any AM station, turn off
the receiver. While holding down TUNING
MODE. press I/C'). All preset stations will be
erased when you change the tuning scale. To reset
the scale to 10 kHz (or 9 kHz), repeat the
procedure.

Antenna

- Continued on next page -

MULTI CHANNEL AV RECEIVER

SONY®

Page 2

STR-K990

Video section
Inputs/Outputs

Video: 1 Vp-p, 75 ohms
COMPONENT VIDEO:
Y: 1 Vp-p. 75 ohms
Pia/Cu: 0.7 Vp-p, 75 ohms
Piz/CR: 0.7 Vp-p, 75 ohms
80 MHZ HD Pass Through

General

Power requirements

Area code Power requirements
US. Canadian 120 V AC. 60 Hz

Power output (DIGITAL MEDIA PORT)
DC OUT: 5V, 700 mA

Power consumption

Area code Power consumption
US 200 W
Canadian 270 VA

Power consumption (during standby mode)
0.3 W

Dimensions (width/height/depth) (Approx)
17 X 61/4 X 12 1/4 inches
(430 X 157.5 x 310 mm)
including projecting parts
and controls

Mass (Approx) 17 1b 4 oz (7.8 kg)

Design and specifications are subject to change without notice.

SAFETY CHECK-OUT

After correcting the original service problem, perform the following
safety check before releasing the set to the customer:

Check the antenna terminals, metal trim, metallized knobs, screws,
and all other exposed metal parts for AC leakage.

Check leakage as described below.

LEAKAGE TEST

The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes.).
Leakage current can be measured by any one of three methods.

1. A commercial leakage tester, such as the Simpson 229 or RCA
WTA540A. Follow the manufacturers instructions to use these
instruments.

2. A batteryeoperated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC voltmeter. The limit indication
is 0 75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples
ofa passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2 V AC range are suitable. (See

Fig. A)
To Exposed Metal
Parts on Set
AC
0.1511}: g 1.5 kn / voltmeter
(0.75 V)

_7_ Earth Ground
Fig. A. Using an Ac voltmeter to check AC leakage.

SAFETY-RELATED COMPONENT WARNINGII

COMPONENTS IDENTIFIED BY MARK A OR DOTTED LINE
WITH MARK A ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL T0 SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.

ATTENTION AU COMPO'SANT AYANT RAPPORT
A LA SECURITE!

LES COMPOSANTS IDENTIFIES PAR UNE MARQUE ASUR
LEs DIAGRAMMES SCHEMATIoUEs ET LA LISTE DES
PIECES SONT CRITIQUES POUR LA SECURITE DE
FONCTIONNEMENT. NE REMPLACER CES com- POSANTS
QUE PAR DES PIECES SONY DONT LES NUMERos SONT
DONNES DANS CE MANUEL ou DANS LES SUPPLEMENTS
PUBLIEs PAR SONY.