Sony STRK-990 Service manual

STR-K990

SERVICE MANUAL

Ver. 1.0 2007.03

• STR-K990 is the tuner and the amplifier section in HT-DDW990.

This receiver incorporates Dolby* Digital and Pro Logic Surround and the DTS** 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.

SPECIFICATIONS

US Model

Canadian Model

AUDIO POWER SPECIFICATIONS

POWER OUTPUT AND TOTAL HARMONIC DISTORTION: (Models of area code US only)

With 6 ohm loads, both cha nnels drive n, from 120 – 20,000 Hz; rated 90 watts per channel minimum RMS power, with no more than 1% total harmonic distortion from 250 milliwatts to rated output.

Amplifier section

Power Output Stereo mode (6 ohms, 1 kHz, THD 1% )

Surround mode THD 10%)

1)

90 W + 90 W

2)

(reference) (6 ohms, 1 kHz,

RMS output FRONT:140 W

per channel CENTER:140 W SURROUND:140 W

per channel

1)

Measured under the following conditions:

Area code Power requirements

US, Canadian 120 V AC, 60 Hz

2)

Reference power output for front, center and surround speakers. Depending on the sound field settings and the source, there m ay be no sound output.

Inputs

Analog Sensitivity: 800 mV/

50 kohms

Digital (Coaxial) Impedance: 75 ohms

Outputs (Analog)

AUDIO OUT Voltage: 800 mV/

SUB WOOFER Voltage: 2 V/1 kohm

Tone

Gain levels ±6 dB, 1 dB step

Reproduction frequency range:

10 kohms

28 – 20,000 Hz

FM tuner section

Tuning range 87.5 - 108.0 MHz Antenna FM wire antenna Antenna terminals 75 ohms, unbalanced Intermediate frequency

10.7 MHz

AM tuner section

Tuning range

With 10-kHz tuning scale:

530 – 1,710 kHz

With 9-kHz tuning scale:

531 – 1,710 kHz Antenna Loop antenna Intermediate frequency

3)

You 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 ?/1. 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.

450 kHz

— Continued on next page —

3)

9-887-508-01

MULTI CHANNEL AV RECEIVER

Sony Corporation

Home Audio Division Published by Sony Techno Create Corporation

STR-K990

r

Video section

Inputs/Outputs

Video: 1 Vp-p, 75 ohms COMPONENT VIDEO:

Y: 1 Vp-p, 75 ohms P

B/CB: 0.7 Vp-p, 75 ohms R/CR: 0.7 Vp-p, 75 ohms

P 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 st andby mode)

0.3 W

Dimensions (width/height/depth) (Approx.)

17 × 6 1/4 × 12 1/4 inches (430 × 157.5 × 310 mm) including projecting parts and controls

Mass (Approx.) 17 lb 4 oz (7.8 kg)

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 WT -540A. Follow the manuf acturers’ instructions to use these instruments.

2. A battery-operated 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 hav e an accurate low-voltage scale. The Simpson 250 and Sanwa SH-63Trd are examples of a passive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2 V A C range are suitable. (See Fig. A)

To Exposed Metal Parts on Set

Design and specifications are subject to change without notice.

AC

0.15 µF

1.5 k

Ω

Earth Ground

voltmete (0.75 V)

Fig. A. Using an AC voltmeter to check AC leakage.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO 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 COMPOSANT AYANT RAPPORT

LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0 SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLACER CES COM- POSANTS QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU D ANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

À LA SÉCURITÉ!

2

STR-K990

E

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be

damaged by heat.

UNLEADED SOLDER

Boards requiring use of unleaded solder are printed with the leadfree mark (LF) indicating the solder contains no lead. (Caution: Some printed circuit boards may not come printed with

the lead free mark due to their particular size)

: LEAD FREE MARK

Unleaded solder has the following characteristics.

• Unleaded solder melts at a temperature about 40 °C higher than ordinary solder. Ordinary soldering irons can be used but the iron tip has to be applied to the solder joint for a slightly longer time. Soldering irons using a temperature regulator should be set to about 350 °C. Caution: The printed pattern (copper foil) may peel away if

the heated tip is applied for too long, so be careful!

• Strong viscosity Unleaded solder is more viscou-s (sticky, less prone to flow) than ordinary solder so use caution not to let solder bridges occur such as on IC pins, etc.

• Usable with ordinary solder It is best to use only unleaded solder but unleaded solder may also be added to ordinary solder.

About area codes

Th

e area code of the receiver you purchased is shown on the lower right portion of the rear panel (see the illustration below).

BACK PANEL

LL

R

NT ARSURROUND

CENTER

RS

Any differences in operation , according to the area code, are clearly indicated in the text, for example, “Models of area code AA only”.

Moreover, it is possible to distinguish the model by Part No..

Part No.

Area code

The letters (L, C, R, etc.) indicate the channels being played back. The boxes around the letters vary to show h ow the receiver downmixes the source sound. Front Left Front Right Center (monaural) Surround Left Surround Right Surround (monaural or the surround components obtained by Pro Logic processing)

Example:

Recording format (Front/ Surround): 3/2.1 Sound Field: A.F.D. AUTO

SW

LCR

SL SR

MONOD.RANGECOAX

qaqsqf qd

5

STR-K990

Rear panel

DIGITAL

OPTICAL

ANTENNA

SAT

IN

VIDEO 2/

BD IN

COAXIAL

DVD

IN

DMPORT

AM

OUT IN IN

SA-CD/CD/CD-R

12

DVD IN VIDEO 2/BD IN OUT

HDMI

DVD IN VIDEO 1 IN

SAT IN

VIDEO OUT

AUDIO OUT

VIDEO 1

VIDEO IN

L

R

AUDIO IN

VIDEO OUT

MONITOR

AUDIO OUT

SUB

WOOFER

COMPONENT VIDEO

VIDEO IN

L

R

L

R

AUDIO IN

TV

SAT

DVD

FRONT B

P

PR/C

MONITOR OUT

LR

Y

B/CB

R

LL

R

FRONT A

SPEAKERS

R

SURROUND

3456

CENTER

A DIGITAL INPUT/OUTPUT section

OPTICAL IN jacks

COAXIAL IN jack

HDMI IN/ OUT jacks*

DMPORT jack

Connects to a DVD player, etc. The COAXIAL jack provides a better quality of loud sound (page 21, 24,

26). Connects to a DVD

player or a Blu-ray disc player. The image and the sound are output to a TV or a projector (page 21).

Connects to a DIGITAL MEDIA PORT adapter (page 61).

B COMPONENT VIDEO INPUT/

OUTPUT section

Green (Y)

Blue

B/CB

(P Red

R/CR

(P

COMPONENT VIDEO INPUT/ OUTPUT

)

jacks*

)

Connects to a DVD player, TV, satellite tuner, etc. You can enjoy high quality image (page 23–26).

C SPEAKERS section

Connects to speakers (page 17).

D VIDEO/AUDIO INPUT/OUTPUT

section

White (L)

Red (R)

Yellow

AUDIO IN/ OUT jacks

VIDEO IN/ OUT jacks*

Connects to the video and audio jacks of a VCR, DVD player, etc. (page 23–27).

E AUDIO INPUT/OUTPUT section

White (L)

Red (R)

AUDIO IN/ OUT jacks

Connects to a Super Audio CD player, CD recorder, etc. ( page 19, 23).

F ANTENNA section

FM ANTENNA jack

AM ANTENNA terminals

*You can watch the selected input imag e when you

connect the HDMI OUT or MONITOR OUT jack to a TV (page 23).

Connects to the FM wire antenna supplied with this receiver (page 28).

Connects to the AM loop antenna supplied with this receiver (page 28).

Connects to sub woofer (page 17).

6

STR-K990

w

Remote commander

You can use the supplied remote to operate the receiver and to control the Sony audio/vi deo components that the remote is assigned to operate. You can also program the remote to control non-Sony audio/video components. For details, see “Programming the remote” (page

65).

Name Function

A AV ?/1

(on/standby)

Press to turn on or off the audio/video components that the remote is prog ra mmed to operate. To turn the TV on or off, press TV (wj) and then press AV ?/1. If you press ?/1 (B) at the same time, it will turn off the receiver and other components (SYSTEM STANDBY).

Note

RM-AAP017

The function of the AV ?/1 switch changes automatically each time you press the input buttons (C).

Press to turn the re ceiv er on or off. To turn off all components, press ?/1 and AV ?/1 (A) at the same time (SYSTEM STANDBY).

select the componen t you want to use. When you press any of the input buttons, the receiver turns on. The butt ons are factory assigned to control Sony components as follows. You can program th e remote to control non-Sony components following the steps in “Programmin g the remote” on page 65.

Button Assigned Sony

component

VIDEO 1 VCR (VTR mode 3) VIDEO 2 VCR (VTR mode 2) VIDEO 3 VCR (VTR mode 1) DVD DVD player SATSatellite tuner TV TV SA-CD/CD Super Audio CD/

CD player TUNER Built- in tune r AUXNot assigned DMPORT DIGITAL MEDIA

PORT adapter

wj

wh wg

k

RM SET UP

TV

VIDEO 1 VIDEO 2 VIDEO 3 DVD

SAT TV TUNER

AUX DMPORT RECEIVER

2CH A.F.D. MOVIE MUSIC

SLEEP

FM MODE D. TUNING

?/1

AV ?/1

SYSTEM STANDBY

SA-CD/CD

AUTO CAL

wf

23

1 456

wd

ws

wa

w; ql

qk

qj

789

– /– –

CLEAR

>10

GUIDE DISPLAY

B

RETURN/

EXIT

REPLAY ADVANCE

.

TUNING –

m M

DISC SKIP

TV VOL

MASTER VOL

MUTING

<

0/10

V

v

MENU

H

ENTER

MEMORY

<

TV CH

PRESET

B

OPTIONS

TOOLS

>

TUNING +

xX

qh

DVD

qg

TOP MENU MENU F1

F2

TV INPUT WIDE

1 2

3

4

5 6

7

8

9

q; qa

qs

qd

qf

B ?/1

(on/standby)

C Input buttons Press one of the buttons to

7

STR-K990

Name Function

D RECEIVER Press to activate the receiver

operation (page 40).

E D.TUNING Press to enter direct tuning

mode.

F AUTO CAL Press to activate the Auto

Calibration function.

G Numeric

buttons (number 5

H ENTER Press to enter the value after

MEMORY Press to store a station during

I DISPLAY Press to select information

Press to –preset/tune to pre set

a)

stations.

)

–select track numbers of the

CD player, VCD player, LD player, DVD player, MD deck, DAT deck, or tape deck. Press 0/10 to select track number 10 .

–select channel numbers of

the VCR, satellite tuner, Blu-ray disc recorder, PSX, DVD/VHS COMBO, or

DVD/HDD COMBO. Press TV (wj) and then press the numeric buttons to select the TV channels.

selecting a channe l, disc or track using the num eric buttons of the VCR, CD player, VCD play er, LD player, MD deck, DAT deck, tape deck, satellite tuner, Bluray disc recorder , or PSX. To enter the value of Sony TV, press TV (wj) and then press ENTER.

tuner operation.

displayed on the TV screen of the VCR, VCD player, LD player, DVD player, CD player, MD de ck, Blu-ra y disc recorder, PSX, satell ite t uner, DVD/VHS COMBO, or DVD/HDD COMBO. To select information of Sony TV, press TV (wj) and then press DISPLAY.

Name Function

J OPTIONS

TOOLS

K MENU Press to display the menus of

L ./>

m/M

H

b)

a)b)

Press to display and select items from th e option menus for DVD player or DVD/VHS COMBO. To display the options of Sony TV, press TV (wj) and then press OPTIONS TOOLS.

the receiver, VCR, DVD player, satellite tuner, Blu-ray disc recorder, PSX, DVD/ VHS COMBO, or DVD/HDD COMBO on the T V sc reen. Then, use V/v/B/b and to perform menu operations. To display the menus of Sony TV, press TV (wj) and then press MENU.

b)

Press to skip tracks of the VCR, CD player, VCD player, LD player, DVD player, MD deck, DAT deck, tape deck, Blu-ray disc recorder, PSX, DVD/VHS COMBO, or DVD/HDD COMBO.

Press to –search tracks in the forward/

backward direction of the CD player, VCD player, DVD player, LD player, MD deck, Blu-ray disc recorder, PSX, DVD/VHS COMBO, or DVD/HDD COMBO.

–fast forward/rew i nd of t he

VCR, DAT deck, or tape deck.

Press to start playback of the VCR, CD player, VCD player, LD player, DVD player, MD deck, DAT deck, tape deck, Blu-ray disc recorder, PSX, DVD/VHS COMBO, or DVD/HDD COMBO.

8

STR-K990

Name Function

b)

X

b)

x

TUNING +/– Press to scan a station.

a)

M TV CH +

PRESET

a)

+

/– Press TV (wj) and then

/–

N F1, F2 Press F1 or F2 to select a

TV INPUT Press TV (wj) and then

WIDE Press TV (wj) and then

Press to pause playback or recording of the VCR, CD player, VCD player, LD player, DVD player, MD deck, DAT deck, tape deck, Blu-ray disc recorder, PSX, DVD/VHS COMBO, or DVD/HDD COMBO. (Also starts recording w it h components in recording standby.)

Press to stop playback of the VCR, CD player, VCD player, LD player, DVD player, MD deck, DAT deck, tape deck , Blu-ray disc recorder, PSX, DVD/ VHS COMBO, or DVD/ HDD COMBO.

press TV CH +/– to select preset TV channels.

Press to –select preset statio ns. –select preset channels of

the VCR, sate llite tuner, Blu-ray disc recorder, DVD player, DVD/VHS COMBO, or DVD/HDD COMBO.

component.

• DVD/HDD COMBO F1: HDD mode F2: DVD mode

• DVD/VHS COMBO F1: DVD mode F2: VHS mode

press TV INPUT to select the input signal (TV input or video input).

press WIDE to select the wide picture mode.

Name Function

O DVD TOP

MENU

DVD MENU Press t o display the menu of

P MUTING Press to mute the sound (page

Q TV VOL +/– Press TV (wj) and then press

MASTER VOL +/–

R DISC SKIP Press to skip disc of the CD

S REPLAY /

ADVANCE

T RETURN/

EXIT O

Press to di s play the menu or on-screen guide of the DVD player on the TV screen. Then, use V/v/B/b and to perform menu operations.

the DVD player on the TV screen. Then, use V/v/B/b and to perform menu operations.

36). To mute the sound of the TV, press TV (wj) and then press MUTING.

TV VOL +/– to adjust the TV volume level.

Press to adjust the volume level of all speakers at the same time.

player, VCD player, DVD player, or MD deck (multidisc change r only).

<

Press to replay the previous

<

scene or fast forward the current scene of the DVD player, Blu-ray disc recorder, DVD/VHS COMBO, or DVD/HDD COMBO.

Press to –return to the pre vious menu. –exit the menu while the

menu or on-screen guide of the VCD player, LD player, DVD player, Blu-ray disc recorder, PSX, DVD/VHS COMBO, or satellite tuner is displayed on the TV

screen. To return to the previous menu of Sony TV, press TV (wj) and then press RETURN/EXIT O.

9

STR-K990

Name Function

U

V GUIDE Press to display the EPG

W CLEAR Press to clear a mistake when

X SLEEP Press to activate the Sleep

Y FM MODE Press to select FM monaural

Z 2CH Press to select a sound field

,

V/v/B/b

-/-- Press to select the channel

>10 Press to select track numbers

A.F.D. MOVIE MUSIC

After pressi n g RECEIVER (D), press MENU (K) for receiver operation, then press V/v/B /b to select the settings. After pressing DVD TOP MENU (O) or DVD MENU (O), press V/v/B/b to se le ct the settings, and th en press to enter the selection. Press also to enter the selection of the re ceiver, VCR, satellite tuner, DVD player, Blu-ray disc recorder, PSX, DVD/VHS COMBO, or DVD/HDD COMBO.

(Electronic Program Guide) of the TV, DVD player, satellite tuner, Blu-ray disc recorder, PSX, or DVD/HDD COMBO.

you press the incorrect numeric button of the DVD player, Blu-ray disc recorder, PSX, satellite tuner, DVD/ VHS COMBO, or DVD/HDD COMBO.

entry mode, either one or two digit of the VCR or satellite tuner. To select the channel en try mode of the TV, press TV (wj) and then press -/--.

over 10 of the CD player, VCD player, LD player, MD deck, tape deck, TV, VCR, or satellite tuner.

Timer function and th e duration which the receiver turns off automatically.

or stereo reception.

(page 49, 51, 54)

Name Function

wj TV Press to light up the button. It

changes the remote key function to activate the buttons with orange printing. It also activate the DI SPLAY (I), OPTIONS TOOLS (J), MENU (K), RETURN/EXIT O (T),

(U), and V/v/B/b (U) buttons to perform menu operations for Sony TVs only.

wk RM SET UP Press to set up the remo te.

a)

The number 5, TV CH +, PRESET + and H buttons have tactile dots. Use the tactile dots as references when operating the receiver.

b)

This button is also a vaila ble for DIGIT AL MEDIA PORT adapter operation. For details on the function of the button, see t he op erating instructions supplied with the DIGITAL MEDIA PORT adapter.

Notes

•Some functions explained in this section may not work depending on the mode l.

•The above explanation is intended to serve as an example only. Therefore, depending on the component, the above operation may not be possible or may operate differently than described.

•The AUX button on the remote is not avai la ble for receiver opera tion.

10

SPK Front Left

DCAC MIC

Receiver

SECTION 2

TEST MODE

STR-K990

SOUND FIELD CLEAR MODE

The preset sound field is cleared when this mode is activated. Use this mode before returning the product to clients upon completion of repair.

Procedure:

1. While depressing the 2CH button, press the power ?/1 button to turn on the main power.

2. The message “S.F. CLR.” appears and initialization is performed. (3 second)

SOFTWARE VERSION DISPLAY MODE

The software version is displayed.

Procedure:

1. While depressing the SPEAKERS (OFF/A/B/A+B) and the DISPLAY buttons simultaneously, press the power ?/1 button to turn on the main power.

2. The model name, destination and the software version are displayed. (8 second)

KEY CHECK MODE

Button check

Procedure:

1. While depressing the SPEAKERS (OFF/A/B/A+B) and the 2CH buttons simultaneously , press the power ?/1 button to turn on the main power. “REST 13” appears.

2. Every pressing of any button other than ?/1 counts down the buttons. The buttons which are already counted once are not counted again.

3. When all buttons are pressed “REST 00” appears.

SWAP ALL MODE

The signal will be swapped to all channels so that all speakers will have sound output.

Procedure:

1. While depressing the SPEAKERS (OFF/A/B/A+B) and the A.F .D. buttons simultaneously, press the power ?/1 button to turn on the main power.

2. “SWP. ALL” appears. (No change while displayed.)

SHIPMENT MODE

All preset contents are reset to the default setting.

Procedure:

1. While depressing the SPEAKERS (OFF/A/B/A+B) and the MUSIC buttons simultaneously, press the power ?/1 but- ton to turn on the main power.

2. “CLEARED” appears and switch off the set.

PROTECTOR

If an error occurs, the “Protector Display” will flash for a while and the power is turned OFF.

Procedure:

1. While depressing the TUNING MODE and the A.F.D. buttons simultaneously, press the power ?/1 button to turn on the main power.

2. “PROT. EVER” appears (3 seconds).

DCAC FACTORY TEST MODE

DCAC Factory Test mode have two stages:

1. DCAC DSP Data Line Checking

2. DCAC board Checking

FLUORESCENT INDICATOR TUBE TEST MODE

All fluorescent segments are tested. When this test is acti v ated, all segments turn on at the same time, then each segment turns on one after another.

Procedure:

1. While depressing the TUNING MODE and the DISPLAY buttons simultaneously, press the power ?/1 button to turn on the main power.

2. All segments turn on.

SP A

LFE

SW

L C R

SLSSR

SB SBRSBL

SP B

;

D EX

PL II x;PL

OPT

HDMI COAX

DTS-ES 96 / 24

3. Turn the INPUT SELECTOR dial.

LFE

L R

S

SP B

x

4. Turn the INPUT SELECTOR dial once again.

SW

C

SL SR

SB SBRSBL

D

DTS

PL

;;

5. Turn the INPUT SELECTOR dial once again. All segments turn off.

6. Every turning of the INPUT SELECTOR dial turns on each segment one after another in the same order.

CAT

MEMORY

dB k Hz mft. MHz

k m MHz

MEMORY

dB

Hz

ft.

NEO:6 SAT D.RANGE

NEO:6 D.RANGE MONOCOAX

RDS ST

MONO

RDS

Start Pass Pass

DSP Data Line

Check

Auto Cal Mic

Check

END

Factory Test System Setup

1. When power off : Press the three buttons MEMORY/ENTER + MOVIE +

ST

?/1 . “DCAC[]FTM” appears. Afterward, press the TUNING MODE to start DCAC f actory test mode.

11

STR-K990

1.DCAC DSP Data Line Checking

After press the TUNING MODE , DCAC Factory test mode will start, below display will show:

“DCAC[][][]x” x = 1, 2, 3 If there is error happen, below display will show:

“ERR[]SD0x” x = 1 → D1501 or R1530

x = 2 → D1502 problem x = 3 → D1503 problem

2.DCAC board Checking

Connect front left speaker of the receiver and AUTO CAL microphone. Turn MASTER V OLUME jog, there will be test tone sound output from front left speaker, and the display will change accordingly.

“AD[]-[]xxx” xxx = 0 to 255 (depends on loudness of test tone)

VACS CONTROL

The VACS feature of the amplifier is turned off purposely.

Procedure:

1. While depressing the MEMORY/ENTER and the 2CH buttons simultaneously, press the power ?/1 button to turn on the main power.

2. “VACS OFF” appears. (8 second)

AM CHANNEL STEP 9 kHz/10 kHz SELECTION MODE

• Either the 9 kHz step or 10 kHz step can be selected for the AM channel step.

• Procedure: Set the FUNCTION to AM. Turn off the main power. While depressing the TUNING MODE button, press the power ?/1 button to turn on the main power. Either the message “9 k STEP” or “10 k STEP” appears. Select the desired step.

12

TUNER SECTION

[FM Auto Stop Check]

STR-K990

SECTION 3

ELECTRICAL ADJUSTMENT

generator

SET

Procedure:

1. Turn the power on.

2. Input the following signal from Signal Generator to FM antenna input directly.

* Carrier Freq: A = 87.5 MHz, B = 98 MHz, C = 108 MHz

Deviation : 75 kHz Modulation : 1 kHz ANT input : 35 dBu (EMF)

Note: Please use 75 ohm “coaxial cable” to connect SG and the set. You

cannot use video cable for checking. Please use SG whose output impedance is 75 ohm.

3. Set to FM tuner function and scan the input FM signal with automatic scanning.

4. Confirm that input Frequency of A, B and C are detected and automatic scanning stops.

OUT (75

Ω

)

The stop of automatic scanning means “The station signal is received in good condition.”

13

STR-K990

SECTION 4

DIAGRAMS

THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS. (In addition to this, the necessary note is printed in each block.)

For Schematic Diagrams. Note:

• All capacitors are in µF unless otherwise noted. (p: pF) 50 WV or less are not indicated except f or electrolytics and tantalums.

• All resistors are in Ω and 1/ specified.

• % : indicates tolerance.

• f : internal component.

• 2 : nonflammable resistor.

• 5 : fusible resistor.

• C : panel designation.

Note:

The components identified by mark 0 or dotted line with mark 0 are critical for safety. Replace only with part number specified.

• A : B+ Line.

• B : B– Line.

•Voltages and w av ef orms are dc with respect to ground under no-signal (detuned) conditions. No mark : FM

•Voltages are taken with a VOM (Input impedance 10 MΩ). Voltage variations may be noted due to normal production tolerances.

•Waveforms are taken with a oscilloscope.

• Circled numbers refer to waveforms.

• Signal path.

F : FM J : ANALOG c : DIGITAL I : VIDEO

4

W or less unless otherwise

Note:

Les composants identifiés par une marque 0 sont critiques pour la sécurité. Ne les remplacer que par une piéce portant le numéro spécifié.

For Printed Wiring Boards. Note:

• X : parts extracted from the component side.

• a: Through hole.

• f : internal component.

• : Pattern from the side which enables seeing. Caution:

Pattern face side: Parts on the pattern f ace side seen from (Side B) the pattern face are indicated. Parts face side: Parts on the parts face side seen from (Side A) the parts face are indicated.

• Indication of transistor.

C Q

B

E

B

These are omitted.

CE

These are omitted.

• Circuit Boards Location

POWER KEY board

DCAC board

HEADPHONE board

STANDBY board

DCDC board

VIDEO board

HDMI SW board

DIGITAL board

VIDEO 3 board

MAIN board

DISPLAY board

14

4-1. BLOCK DIAGRAM – MAIN SECTION –

J402(1/2)

VIDEO 1

AUDIO IN

J405 (1/2)

PORTABLE AV IN

DIGITAL

SA-CD/CD/CD-R

SAT

DVD

VIDEO 3 IN/

COAXIAL

OPTICAL

ANTENNA

HDMI

TV

J403 (1/2)

AUDIO IN

J298(1/2)

AUDIO

J1311

DMPORT

DVD

IN

VIDEO 2/

BD IN

SAT

IN

FM 75Ω

COAXIAL

AM

DVD IN

VIDEO 2 / BD IN

IN

IC3002

J1301

OPTICAL

CN5001

CN5002

IC1351

IC1354

IN

L

DMPORT+5V

C LINK_TX

C LINK_RX DET

IC1303

35

TN1

TUNER PACK

FM

AM

1

5

L CH R CH

DO/SD/ST

IC5004 INPUT

DET

31

IC1303

62

DI

CLK

CE

SD

7

3

R-CH

TUNER +10V10V

43

IC5005

3

INPUT

1

SELECT

74

46

SLATCH

TUNER SD

6

73

47

DO/SD/ST

TUNER_CLK

TUNER_DATA

4

28

27

26

C LINK_DET

FLASH2/C LINK_RX

62-64, 67,68, 70,71, 73,74, 76,77

2,3,5, 6,8,9, 11,12, 14,15,

80

IC1301

DIGITAL AUDIO

I/F RECEIVER

5

DIN2

3

DIN0

4

DIN1

35

DO

36

DI

38

CLK

37

CE

34

ERROR

17

XSTATE

48

XMODE

47

CKSEL1

XIN XOUT

22 21

X1301

12.288MHz

98 97 95 96 99 100 94 1

DI

DO

FLASH1/C LINK_TX

HDMI_S1

86

87

21

42

S1

IC5001

HDMI

SELECT

CE

CLK

HDMI_OED

HDMI_PRE

88

OEB

ERROR

25,26, 28,29, 31,32, 34,35, 38-40

93

XSTATE

XMODE

CKSEL1

SYSTEM CONTROLLER

HDMI +5.8V

XMCK

CK OUT

BCK

LRCK

DATAO

IC1101(1/2)

IC5002

+5V REG

20

13

14

15

16

24AUDIO

D1301

1

DATA0

45

STR-K990

IC401

ANALOG SOUND

PROCESSOR

28

INDL

34

INGL

32

INFL

30

INEL

26

INCL

28

INDL

36

INHL

38

INIL

IC1401

AD CONVERTER

16

SYSCLK

LIN

RST

6

10

12

13

14

PCM1609_ML

PCM1609_MC

PCM1609/1803_RST

VIDEO 1

VIDEO 3 IN/

PORTABLE AV IN

VIDEO 1 IN

VIDEO

1

15

PCM1609_MDI

PCM1609_MDO

SAT

DVD

DVD IN

SAT IN

38

40

41

47

45

46

37

36

35

34

33

J201 (1/2)

VIDEO IN

J200(1/2)

VIDEO IN

J298(2/2)

VIDEO

IC1452

AUDIO CODEC

SCKI

BCK

LRCK

DATA3

DATA1

DATA2

RST

ML

MC

MDI

MDO

J301

Y

P

B/CB

P

R/CR

Y

P

B/CB

P

R/CR

Y

P

B/CB

P

R/CR

VOUT5

VOUT1

VOUT3

VOUT4

10

14

12

11

IC1403 31

IC1405 57

IC1404 31

IC1404 57

59

60

VO ICL_DA

15

DOUT

14

BCK

13

IC1501

AUDIO DSP

17

BCKI1

SCK OUT

12 9

X1502

13.9MHz

BCKO

SDO1

SDO2

SDO3

MCLK1

14

20

19LRCKO

23

24

25

IC1502

SRAM

IC1503

SELECTOR

2

BST

B

Y

556

A

1 S 6

92

BST_SEL

15

LRCKI1

18 SDI1

22

KFSI0

29

BCKI2

28

LRCKI2

30

SDI2

69

GP8

68

GP9

37

GP12

35

HD OUT

33

HD IN

34

HCLK

36

HCS

32

HACN

PM

113

2

XRST

59

EXLOCK

MCLK2

20

4

5

7

8

2

18

19

GP9

GP12

HD IN

HD OUT

CN5003

6

PM

HCS

HCLK

XRST

HACN

OUT

HDMI

• R-CH is omitted due to same as L-CH.

• Signal Path

LRCK

D1501-1503

3

57

BST

ADCC_INT

: FM

: ANALOG

COMPONENT

: DIGITAL

: VIDEO

VO ICL_CL

41

49

52

51

56

60

59

COMP_S2

COMP_S1

9091

AOUTL

INCL

INCSL

INCC

INCSW

DATA

CLK

IC1131

EEPROM

SDA SCL

5 6

29 30

SDA

COMP_MUTE

78

ROUTAL

ROUTBL

SCL

13

V1

3

SAT

5

DVD

9

V3

1

CH1 IN1

CH2 IN17

CH3 IN116

CH1 IN23

CH2 IN29

CH3 IN214

5

CH1 IN3

CH2 IN311

12

CH3 IN3

44

46

OUT L

88

OUT SL

85

OUTC

86

OUTSW

81

V_SW1

V_SW3

V_SW2

24 7525

76

14

10

SW14SW36SW42SW5

SW2

IC203

VIDEO AMP

4

SW12SW2

IC304

VIDEO AMP

V_SW4

21

P.SAVE

D204

D203

M.OUT

V1OUT

CH1 OUT

CH2 OUT

CH3 OUT

L

SL

DISPLAY /POWER

A

SECTION

(Page 16)

C

SW

1

15

22

20

18

J402 (2/2)

AUDIO OUT

J405 (2/2)

OUT

J201(2/2)

VIDEO OUT

J200(2/2)

VIDEO OUT

J302

Y

P

B/CB

P

R/CR

SA-CD/CD/CD-R

MONITOR

OUT

VIDEO 1

CONPONENT

VIDEO

STR-K990

1515

STR-K990

4-2. BLOCK DIAGRAM – DISPLAY/POWER SECTION –

MAIN

SECTION

(Page 15)

AUTO CAL MIC

J309

SW

IC701

POWER AMP

+V OUT2

12

Q701,702

LIMITER

L

A

SLSL

C

J2000

IC103

REMOTE CONTROL RECEIVER

X1101

24MHz

8

IN2

-V OUT2

IC601

POWER AMP

+V OUT2

IN2

8

-V OUT2

IC501

POWER AMP

+V OUT2

8

IN2

2

NF2

X0

82

X1

83

54 SIRCS

9

11

12

9

11

12

9

11-V OUT2

IC2000

AMP

5 1

9

Q651,652

LIMITER

Q501,502

LIMITER

FL_LAT

16

FL_CLK17FL_DATA

BUFFER

BOOSTER

IC101

Q703

Q704

Q653

Q654

Q503

Q504

Q740

Q705,706 CURRENT

DETECT

Q655,656 CURRENT

DETECT

Q505,506 CURRENT

DETECT

38

ADCC

IC100

FL DRIVE

14

SEG1-17

DIN

7

29 31

CLK

8

STB

9

42

32

GRID1-11

Q722,723,725

Q793,795

PROTECT SWITCH

61

PROTECTOR

INDICATOR TUBE

R-CH

R-CH R-CH

SR-CH

R-CH

FL101

FLUORESCENT

AF POWER

PROTECT

AF POWER

PROTECT

AF POWER

PROTECT

D841 VACS

CONTROL

45

VAX CTRL

SYSTEM CONTROLLER

IC1101(2/2)

F1 F2

Q640

SR-CH

Q540

D1107

D1108

D1109

D1110

D1111

66

67

70

69

SW_RY

FRONT_A_RY/DG51_FB

FRONT_B_RY/DG51_FA

ENCODER

MASTER VOLUME

62

HP_RY

C/REAR/SB_RY

VOL_ENCODER(B)

VOL_ENCODER(A)

64

65

3 2

RV102

Q560 RELAY DRIVE

Q611 RELAY DRIVE

Q710 RELAY DRIVE

Q610 RELAY DRIVE

Q612 RELAY DRIVE

Q790 RELAY DRIVE

ENC_B32ENC_A

31

3 2

ENCODER

RV101

INPUT

SELECTOR

RY560

RY710

RY701

RY601

RY610

RY791

R-CH

SR-CH

55

HP_DETECT

A/D1

39

FUNCTION

KEY

S109-112,115

R-CH

TM602

L

RR-CH

TB001

L

R

L

R

TM604

72

A/D2

40

FUNCTION

KEY

S101-108

AUDIO OUT

89

HDMI_CTRL

BRIDGABLE_RY

56

SUB WOOFER

FRONT B

FRONT A

(IMPEDANCE USE 6-16Ω)

SURROUND

CENTER

J790

PHONES

AVRH

AVCC

VCC3

VCC5

RSTX

STOP

POWER_RY

POWER_KEY

S100

?/1

SPEAKERS

63FUSE_DETECT

36

35

84

23

77

48

58

DMPORT

IC1111

RESET

1 2

VIDEO

+5V

TUNER

+10V

RELAY

+B

AUDIO

+7V

AUDIO

+5V

AUDIO

-7V

VIDEO

-5V

IC1906

+5V

4 2

+5V

+B

-B

FL101

-20V

POWER AMP

-B

HDMI +3.3V

HDMI +5.8V

+5V

+3.3V

+2.5V

+3.3V

(STBY)

REG

2 7

• R-CH is omitted due to same as L-CH.

• Signal Path

IC691

PROTECT

DET

: FM

IC807

+5V

2 1

REG

IC1902

+10V

3 1

REG

IC801

+7V

1 3

REG

IC1001

+5V

3 1

REG

IC802

-7V

3 2

REG

IC804

-5V

2 1

REG

IC4001

+7V

2 1

REG

Q801

-20V REG

Q691,692

-B

SWITCH

IC5003

+3.3V

3 1

REG

IC5006

+5.8V

4

REG

1

IC1031

+5V

3 1

REG

IC1903

+3.3V

2

REG

+2.5V

5

REG

IC1904

+3.3V

3 1

REG

Q921

AC DET

2

4

D1001

Q809 RELAY DRIVE

D802

R803

D920-923

D4001

RY801

D805-808

D910-913

D914

Q901

RELAY

DRIVE

F4001

F4002

T901

F1

F2

F901

T902

AC IN

D915

RY901

STR-K990

1616

STR-K990

4-3. PRINTED WIRING BOARD – DIGITAL BOARD (SIDE A) –

12

A

DIGITAL BOARD

B

C

D

E

J1311

DMPORT

R1354

R1940

FB1505

C1921

C1920

JL008

C1911

J1311

C1362

IC1401

C1415

C1639

FB1310

R1351

FB1504

JL007

C1414

R1411

R1356

C1361

JL009

C1401

R1410

R1096

FB1350

R1301

D1302

JR1005

C1302

C1303

R1303

IC1303

R1357

JL011

JL010

JL014

FB1403

C1404

R1401

C1409

C1408

C1301

• See page 14 for Circuit Boards Location.

:Uses unleaded solder.

345678

(SIDE A)

• Semiconductor

R1061

R1014

R1041

R1135

R1120

R1490

C1451

C1422

R1455

C1568

C1913

R1062

R1015

R1011

R1067

R1151

R1454

R1095

R1065

R1042

R1076

R1153

R1947

R1094

R1013

R1012

R1010

R1140

R1121

R1152

R1154

IC1131

C1411

R1948

R1414

R1157

R1156

R1185

R1188

C1031

D1001

R1125

C1102

X1101

IC1101

C1620

C1118

C1142

R1194

C1119

R1164

R1084

IC1111

R1524

C1137

R1127

C1604

R1635

54

13

R1189

JL002

JL005

R1122

R1123

R1124

C1605

R1636

R1201

C1107

R1108

R1129 R1083

R1128

C1129

R1126

R1114

R1111

R1110

R1106

C1131

R1112

C1122

R1107

R1035

R1117

R1118

C1132

R1191

D1109

C1123

R1175

R1192

C1067

C1068

FB1308

R1077

1-872-321-

R1179 R1180 R1088 R1073 R1072

R1181 R1182

TP1000

12

(12)

C1304

R1359

JR1008

FB1453

R1469

C1405

R1318

C1315

R1321

IC1301

R1304

R1307

R1306

R1360

R1319

JR1511

D1301

C1522

R1305

JR1020

R1556

R1502

IC1452

R1642

FB1452

FB1405

R1407

C1002

R1325

R1308

R1309

FB1305

C1521

FB1503

R1505

C1460

R1492

C1483

R1484

C1487

R1312

R1313

X1301

R1310

X1502

R1504

C1461

R1483

R1311

R1501

C1509

C1511

R1512

R1515 R1523

R1513

R1506

IC1403

R1444

R1486

RB1506

R1514

R1508

R1491

C1441

R1446

IC1502

RB1501

RB1502

IC1501

R1509

C1472

R1470

C1471

R1434

R1473

C1474

IC1404

R1445

R1476

R1253

RB1503

RB1504

R1574

IC1503

C1420

C1475

R1495

C1432

R1435

R1464

R1436

R1555

R1557

RB1500

RB1507

RB1508

R1570 R1571 R1572

R1573

R1541

C1502

R1510

R1421

R1493

R1463

C1462

IC1405

C1569

C1567

R1511

R1144

R1424

R1426

R1943

R1068

R1066

R1050

R1150

R1134

R1143

R1160

R1161

R1049

R1494

R1425

R1466

9

Location

Ref. No.

D1001 C-6 D1109 C-7 D1301 C-3 D1302 C-3

IC1101 D-7 IC1111 C-7 IC1131 E-6 IC1301 C-3 IC1303 C-3 IC1401 E-2 IC1403 E-4 IC1404 E-4 IC1405 E-5 IC1452 D-3 IC1501 D-4 IC1502 C-4 IC1503 D-5

Location

STR-K990

F

1717

STR-K990

4-4. PRINTED WIRING BOARD – DIGITAL BOARD (SIDE B) –

DIGITAL BOARD

• Semiconductor Location

Ref. No.

D1003 D-3 D1004 D-4 D1107 C-7 D1108 C-7 D1110 C-7 D1111 C-7 D1501 D-3 D1502 D-3 D1503 D-3

IC1001 F-3 IC1031 B-8 IC1351 C-2 IC1354 B-2 IC1902 B-5 IC1903 B-7 IC1904 C-6 IC1906 D-2

DISPLAY

(Page 29)

Location

BOARD

CNS100

H

for

FLASH

PROGRAMMING

CL026

IC1031

1

3

C1032

CL029

CL031

JL013

CNS504

CL035

CL027

CNS513

HS1903

2

R1105

R1186

CL030

CL032

CL034

C1905

IC1903

C1908

W1001

R1187

CL022

CL028

R1078

R1184

C1140

C1100

CL033

C1171

C1172

R1183

C1906

CL021

C1108

CNP503

• See page 14 for Circuit Boards Location.

MAIN

BOARD

CNP913

(Page 24)

D

STANDBY

BOARD

CNP903

(Page 31)

C

(SIDE B)

1

CL025

2

C1103

JR1001

JR1000

C1149

C1121

R1159

CL037

CNP505

5 6

7

R1941

C1139

CL036

CNS502

C1145

C1144

C1495

C1413

C1904

C1022

D1111

R1190

D1107

D1110

C1138

C1021

1

3

R1039

D1108

C1299

C1255

C1254

IC1904

FB1101

R1163

C1124

FB1501

JR1006

JR1004

C1453

MAIN

BOARD

CNP912

(Page 24)

13

IC1902

FB1502

C1515

C1517

C1518

R1644

R1640

C1423

C1458

:Uses unleaded solder.

TN1

ANTENNA

AM

B

FM

75

COAXIAL

CL016

C1516

C1525

C1463

C1418

CL045

C1914

C1019

JR1002

R1643

CL041

C1566

CL017

C1253

C1513 C1514

C1508

C1507

C1506

C1505

C1433

C1428

CNS507

CL019

R1645

C1547

C1468

C1120

C1520

C1519

JR1003

C1504

C1473

CNS501

CL020

C1510

C1503

CL040

C1501

R1641

C1438

JL001

CL018

C1442

CL012

C1004

C1491

C1481

C1448

CL013

FB1302

C1907

R1314

C1310

C1309

D1502

D1004

VIDEO

BOARD

CNS207

(Page 35)

A

CL009

CL011

CL007

CNS509

R1261

C1313

R1323

C1909

C1312

R1530

D1501

D1503

D1003

C1494

C1450

C1455

C1001

3

1

IC1001

3456789

CL005

CL003

C1314

C1306

C1358

R1474

C1406

R1260

C1308

R1355

R1503

C1454

C1403

C1005

C1402

CL001

CL004

C1305

JR1010

R1302

C1457

C1407

DCDC

BOARD

CN4103

(Page 31)

E

CL002

JR1009

C1359

C1355

C1919

R1637

C1910

R1409

CL042

CL024

CNP512

3

C1354

1

IC1354

3

C1351

1

IC1351

W1000

IC1906

R1353

CL043

1-872-321-

R1352

SAT

IN

VIDEO 2/

BD IN

12

(12)

12

A

B

OPTICAL

DIGITAL

C

J1301

COAXIAL

DVD IN

D

E

STR-K990

G

MAIN

BOARD

CN500

(Page 24)

MAIN

F

BOARD

F

CNP501

(Page 24)

1818

STR-K990

4-5. SCHEMATIC DIAGRAM – DIGITAL BOARD (1/5) –

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

DIGITAL BOARD

COMP MUTE

HDMI 6.8V

S2(HDMI)

S1(HDMI)

OED(HDMI)

PRE(HDMI)

CTL(HDMI)

DVD IN

COMP_S2

COMP_S1

V_SW1

V_SW2

V_SW3

V_SW4

GND

+6.5V

GND

CNS509

13P

CL013

1

CL012

2

CL011

3

4

CL009

5

6

CL007

7

8

CL005

9

CL004

10

CL003

11

CL002

12

CL001

13

3

2

1

CNP512

3P

GND

2

OUT

1

VCC

3

GND

2

1

OUT

VCC

3

IC1351

J1301

CL024

IC1354

TORX147L

0.1

3.3

IC1351

TORX147L

0.1

3.3

OPTICAL IN

C1639

0.1

IC1354

OPTICAL IN

R1354

100

C1354

0.1

R1351

100

C1351

0.1

JR1009

JR1010

A

B

C

D

E

A

VIDEO

BOARD

CNS207

(Page 36)

E

DCDC

BOARD

CN4103

(Page 32)

DIGITAL

OPTICAL

COAXIAL

SAT

IN

VIDEO 2 / BD IN

F

JL007

1

G

H

P GND

VBUS +5V

VIDEO 5V

C LINK_RX

C LINK_TX

DGND

DM PORT

WM DET

WM AD

AGND_L

AGND_R

WM RxD

WM TxD

VIDEO(NC)

VGND(NC)

I

JL008

2

3

NC

4

JL009

5

JL010

6

JL011

7

DET

8

JL014

9

10

11

12

R1352 1k

13

L

R

1kR1353

14

15

16

17

18

J1311

18P

FB1504

0uH

C_LINK_L

J

• See page 39 for Waveform. • See page 39 for IC Block Diagram.

(1/5)

FB1350

0uH

CLINK_TX

CLINK_RX

FB1310

C1358

0uH

D1302

MA111-TX

C1359

1000

0.1

6.3V

C1920

0.1

C1921

FB1505

C1361

0.1

R1355

75

C1355

22

25V

IC1906

R1637

100 10V

0

SENSE

0

+5V REG

IC1906

IC SI-3050KM-TL

VOUT

5

C1911

0.1

VC

VIN

GND

12345

5

6.5

C1919

22

35V

0.1

0uH

C1910

R1940

0

R1356

470

R1357

2.6

8765

IC1303

TC7WU04FU(TE12R)

2.5

IC1303

W1001

47k

1.2

1.4

INVERTER

1.2

4321

C1303

2

6

DIGITAL

BOARD

5

(4/5)

(Page 22)

6

7

8

9

10

11

12

13

14

15

16

7

DIGITAL

BOARD

(5/5)

(Page 23)

17

18

XMODE

DIR_CKSEL

100pC1313

DIR_DI

100

DOUT

ERROR

DGND

DVDD

R1321 0

10kR1314

0

DI

3.3

R1313

3.3

R1312

3.3

C1312

0.1

252627282930313233343536

R1311

100

C1315

0.1

R1318

10k

3.2 0

47

48

FB1302

0uH

0.1

R1359

100

R1304

R1301

5.6k

JR1005

0

100

R1303

R1302

33k

4.7k

C1302

0.01

C1304

0.01

0.1

C1301

C1305

C1306

0.1

2.5

0.1

3.3

2.9

3.3

0.1

47

16V

D1301

MA111-TX

XMODE

12345678910 11 12

DISEL

DOUT

DINO

DIN1

DIN2

DGND

DVDD

R_SDIN

VIN_AGND

LPF

AVDD

AGND

CKOUT

1314151617181920212223

1.6

R1308

100

JR1511

0uH

0JR1020

R1305

680

CKSEL1

BCK

100R1360

0

1.6

46

CKSEL0

LRCK

C1314

0.1

10kR1323

3.3

43

44

45

DVDD

DOSEL0

DOSEL1

IC1301

DIGITAL AUDIO

I/F RECEIVER

IC1301

LC89056W-E

IC B/D

DATAO

XSTATE

DGND

1.6

FB1305

22R1306

100R1307

100R1309

C1308

0uH

R1319

3.3 0

00

37

38

39

40

41

42

CE

CLK

XSEL

MODE0

MODEL1

DGND

BPSYNC

AUTO_VREF

F3/P3/C3_VF/DATA02

F2/P2/C2_F2/DLMP

F1/P1/C1_F1/FSB1

3

F0/P0/C0_F0/FSB0

CSFLAG

DVDD

XMCK

XOUT

XIN

EMPHA

AUDIO

24

3.3

1.6

R1325

R1310

C1309

0

1M

X1301

12.288MHz

C1310

18p

0.1

0

19

20

21

22

24

28

23

25

26

27

8

1

DIGITAL

3

BOARD

(2/5)

4

(Page 20)

29

STR-K990

K

L

80 8481 82 86

9

8583 87

DIGITAL BOARD

(3/5)

(Page 21)

1919

43

38

No mark:FM

Sony STRK-990 Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual

TABLE OF CONTENTS

4-1. BLOCK DIAGRAM – MAIN SECTION –

4-2. BLOCK DIAGRAM – DISPLAY/POWER SECTION –

4-3. PRINTED WIRING BOARD – DIGITAL BOARD (SIDE A) –

4-4. PRINTED WIRING BOARD – DIGITAL BOARD (SIDE B) –

4-5. SCHEMATIC DIAGRAM – DIGITAL BOARD (1/5) –