Sony STR-K790 User Manual

STR-K790

AUDIO POWER SPECIFICATIONS

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

With 6 ohm loads, both channels driven, from 120 – 20,000 Hz; rated 85 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 (rated) (6 ohms 1 kHz, THD 1%)

85 W + 85 W

Surround mode

(reference)

(6 ohms 1 kHz, THD 10%)

RMS output FRONT:133 W

per channel CENTER: 133 W SURROUND: 133 W

per channel

Surround mode

(reference)

(6 ohms 100 Hz, THD 10%)

SUB WOOFER: 135 W

Measured under the following conditions:

Area code Power requirements

US, Canadian 120 V AC, 60 Hz AEP, UK 230 V AC, 50 Hz

Reference power output for front, center, surround speakers and sub woofer. 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

Tone

Gain levels ±6 dB, 1 dB step

Reproduction frequency range:

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 Models of area code US, Canadian With 10-kHz tuning scale:

530 – 1,710 kHz

With 9-kHz tuning scale:

531 – 1,710 kHz

Models of area code AEP, UK With 9-kHz tuning scale:

531 – 1,602 kHz Antenna Loop antenna Intermediate frequency

450 kHz

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 DIMMER, 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.

General

Power requirements

Area code Power requirements

US, Canadian 120 V AC, 60 Hz AEP, UK 230 V AC, 50/60 Hz

SERVICE MANUAL

Ver. 1.1 2007.03

• STR-K790 is the tuner and the amplifier section in HT-DDW790 and HT-DDW795.

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

AEP Model

UK Model

9-887-542-02

Sony Corporation

Home Audio Division Published by Sony Techno Create Corporation

FM STEREO/FM-AM RECEIVER

— Continued on next page —

STR-K790

Power consumption

Area code Power consumption

US 210 W Canadian 290 VA AEP, UK 220 W

Power consumption (during standby mode)

0.3 W

Dimensions (w/h/d) (Approx.)

429 × 145 × 308 mm (16 7/8 × 5 6/8 × 12 1/8 inches) including projecting parts and controls

Mass (Approx.) 7.4 kg (16 lb 9 oz)

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

2. A battery-operated A C 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 v oltmeter. 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

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.

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!

STR-K790

About area codes

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

FRONTCENTER

SPEAKERS

Area code

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

MODEL IDENTIFICATION – Rear Panel –

Parts No.

Model Part No.

US model 2-896-343-4[] Canadian model 2-896-343-5[] AEP, UK models 2-896-343-6[]

1. GENERAL ................................................................... 4

2. TEST MODE ............................................................... 10

3. ELECTRICAL ADJUSTMENT ............................. 12

4. DIAGRAMS................................................................. 13

4-1. Block Diagram – MAIN Section –.................................. 14

4-2. Block Diagram – DISPLAY/POWER Section –............. 15

4-3. Printed Wiring Board – DIGITAL Board (Side A) –...... 16

4-4. Printed Wiring Board – DIGITAL Board (Side B) –...... 17

4-5. Schematic Diagram – DIGITAL Board (1/5) – .............. 18

4-6. Schematic Diagram – DIGITAL Board (2/5) – .............. 19

4-7. Schematic Diagram – DIGITAL Board (3/5) – .............. 20

4-8. Schematic Diagram – DIGITAL Board (4/5) – .............. 21

4-9. Schematic Diagram – DIGITAL Board (5/5) – .............. 22

4-10. Printed Wiring Boards – HDMI SW Board,

HDMI BRIDGE Board (AEP, UK only) – ...................... 23

4-11. Schematic Diagram – HDMI SW Board,

HDMI BRIDGE Board (AEP, UK only) – ...................... 24

4-12. Printed Wiring Board – MAIN Board – ......................... 25

4-13. Printed Wiring Board – STANDBY Board – ................. 26

4-14. Schematic Diagram – MAIN Board (1/4) – ................... 27

4-15. Schematic Diagram – MAIN Board (2/4),

STANDBY Board – ......................................................... 28

4-16. Schematic Diagram – MAIN Board (3/4) – ................... 29

4-17. Schematic Diagram – MAIN Board (4/4) – ................... 30

4-18. Printed Wiring Board – DISPLAY Board – ................... 31

4-19. Schematic Diagram – DISPLAY Board – ...................... 32

4-20. Printed Wiring Boards – POWER Board, DCAC Board,

HEADPHONE Board –................................................... 33

4-21. Schematic Diagram – POWER Board, DCAC Board,

HEADPHONE Board –................................................... 34

5. EXPLODED VIEWS

5-1. Front Panel Section ......................................................... 42

5-2. Chassis Section................................................................ 43

6. ELECTRICAL PARTS LIST .................................. 44

STR-K790

Receiver

Front panel

SECTION 1

GENERAL

?/1

VIDEO 1 IN/

PORTABLE AUDIO IN/

AUTO CAL MIC

PHONES

2 3 4

DIMMER SLEEP 2CH

A.F.D. MOVIE MUSIC

qaqd

Name Function

A ?/1

(on/standby)

B DIMMER Press to adjust the

C SLEEP Press to activate the Sleep

D 2CH Press to select 2CH

E Display The current status of the

F DISPLAY Press to select information

G AUTO CAL Press to activate the Auto

Press to turn the receiver on or off.

brightness of the display.

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

STEREO mode.

selected component or a list of selectable items appears here.

displayed on the display.

Calibration function.

765 8

MASTER VOLUME

DISPLAY

AUTO CAL

INPUT SELECTOR

Name Function

H MASTER

VOLUME

I INPUT

SELECTOR

J Remote sensor Receives signals from

K MOVIE, MUSIC Press to select sound fields

L A.F.D. Press to select A.F.D. mode. M PHONES jack Connects to a headphone. N VIDEO 1 IN/

PORTABLE AUDIO IN/ AUTO CAL MIC jack

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

Turn to select the input source to playback.

remote commander.

(MOVIE, MUSIC).

–Connects to the supplied

optimizer microphone for the Auto Calibration function.

–To connect a portable

audio such as MP3 player, etc..

About the indicators on the display

1 2 3 4 5 6 87

STR-K790

LFE

LCR

SL S SR

;

PLII

PL OPT DTS MEMORY RDS ST

;

qs qa 9q;

Name Function

A SW Lights up when audio signal is

B LFE Lights up when the disc being

C ; D Lights up when the receiver is

D ; PL/

; PLII

E OPT Lights up when VIDEO 2 input

F DTS Lights up when the receiver is

G MEMORY Lights up when a memory

output from the SUB WOOFER jack.

played back contains an LFE (Low Frequency Effect) channel and the LFE channel signal is actually being reproduced.

decoding Dolby Digital signals. “; PL” lights up when the

receiver applies Pro Logic processing to 2 channel signals in order to output the center and surround channel signals. “; PLII” lights up when the Pro Logic II Movie/Music decoder is activated.

Note

Dolby Pro Logic and Dolby Pro Logic II decoding do not function for DTS format signals.

is selected. However, “UNLOCK” appears on the display if no digital signal is input through the OPTICAL jack.

decoding DTS signals.

function, such as Name Input, Preset Memory, etc., is activated.

Name Function

H Tuner

Indicators

I Preset

station indicators

J D.RANGE Lights up when dynamic range

K COAX Lights up when DVD input is

L Playback

channel indicators

L R C SL SR S

MONOD.RANGECOAX

Lights up when using the receiver to tune in radio stations,

etc.

Note

“RDS” appears for models of area code AEP, UK only.

Lights up when using the receiver to tune in radio stations you have preset. For details on presetting radio stations.

compression is activated.

selected. However, “UNLOCK” appears on the display if no digital signal is input through the COAXIAL jack.

The letters (L, C, R, etc.) indicate the channels being played back. The boxes around the letters vary to show how 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

LFE

LCR

SL SR

STR-K790

Rear panel US, Canadian models

1 2

ANTENNA

DIGITAL

OPTICAL

VIDEO 2/

BD IN

COAXIAL

DVD IN

AUDIO INTVAUDIO IN

SA-CD/CD

AUDIO IN

SAT

A DIGITAL INPUT section

OPTICAL IN jack

COAXIAL IN jack

B ANTENNA section

FM ANTENNA jack

AM ANTENNA terminals

SUB

SURROUND

WOOFER

SPEAKERS

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

Connects to the FM wire antenna supplied with this receiver.

Connects to the AM loop antenna supplied with this receiver.

FRONTCENTER

SPEAKERS

C AUDIO INPUT section

White (L)

Red (R)

AUDIO IN jacks

Connects to a CD player, etc.

D SPEAKER section

Connects to the speakers and sub woofer*.

*The numbers of the SUB WOOFER terminals

varies depending on the models.

AEP, UK models

1 2

ANTENNA

DIGITAL

OPTICAL

VIDEO 2/

BD IN

COAXIAL

DVD

AUDIO INTVAUDIO IN

SA-CD/CD

AUDIO IN

SAT

VIDEO 2 /BD INDVD IN OUT

HDMI

A DIGITAL INPUT section

OPTICAL IN jack

COAXIAL IN jack

HDMI IN/ OUT jacks*

B ANTENNA section

FM ANTENNA jack

AM ANTENNA terminals

SUB

SURROUND

WOOFER

SPEAKERS

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

Connects to a DVD player, etc. The image and the sound are output to a TV or a projector.

Connects to the FM wire antenna supplied with this receiver.

Connects to the AM loop antenna supplied with this receiver.

FRONTCENTER

SPEAKERS

C AUDIO INPUT section

White (L)

Red (R)

AUDIO IN jacks

Connects to a CD player, etc..

D SPEAKER section

Connects to the speakers and sub woofer.

*You can watch the selected input image when you

connect the HDMI OUT jack to a TV or projector.

STR-K790

Inserting batteries into the remote

Insert two R6 (size-AA) batteries in the RM-AAU013 remote commander. Observe the correct polarity when installing batteries.

Remote commander

You can use the supplied remote RM-AAU013 to operate the receiver and to control the Sony audio/video components that the remote is assigned to operate.

RM-AAU013

6 7

8 9 q; qa

wd ws

qj qh

TV INPUT

AUTO

?/1

SLEEP

VIDEO 1 VIDEO 2 VIDEO 3 DVD

SAT TV SA-CD/CD TUNER

2CH A.F.D.

123 46 78

>10/

CLEAR

RETURN/EXIT

TV CH –

PRESET –

TUNING –

?/1

CAL

SYSTEM STANDBY

MOVIE MUSIC

AMP MENU

0/10

REPLAY ADVANCE

FM MODE

D.TUNING

MEMORY DVD MENU

ENTER

MUTING

TOOLSDISPLAY

MASTER VOL

PRESET +

TUNING +

HmM

?/1

D.SKIP

TV VOL

TV CH +

Notes

•Do not leave the remote in an extremely hot or

humid place.

•Do not use a new battery with old ones.

•Do not mix alkaline batteries and other kinds of

batteries.

•Do not expose the remote sensor to direct sunlight

or lighting apparatuses. Doing so may cause a malfunction.

•If you do not intend to use the remote for an

extended period of time, remove the batteries to avoid possible damage from battery leakage and corrosion.

•When you replace the batteries, the remote buttons

may be reset to their factory settings. If this happens, reassign the button again.

Tip

Under normal conditions, the batteries should last for about 3 months. When the remote no longer operates the receiver, replace all the batteries with new ones.

Name Function

A TV ?/1

(on/standby)

AV ?/1 (on/standby)

B ?/1

(on/standby)

C Input buttons Press one of the buttons to

Press TV ?/1 and TV (O) at the same time to turn the TV on or off.

Press to turn on or off the Sony audio/video components that the remote is assigned to operate. If you press ?/1 (B) at the same time, it will turn off the receiver and other components (SYSTEM STANDBY).

Note

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

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

select the component you want to use. When you press any of the input buttons, the receiver turns on. The buttons are factory assigned to control Sony components as follows.

Button Assigned Sony

component

VIDEO 1 VCR (VTR mode 3) VIDEO 2 VCR (VTR mode 2) VIDEO 3 Not assigned DVD DVD player SAT Satellite tuner TV Television SA-CD/CD Super Audio CD/CD

player

TUNER Built-in tuner

STR-K790

Name Function

D 2CH Press to select 2CH STEREO

mode.

A.F.D. Press to select A.F.D. mode. MOVIE,

MUSIC

E AMP MENU Press to display the menu of

F FM MODE Press to select FM monaural or

G D.TUNING Press to enter direct tuning

D.SKIP Press to skip disc of the CD

H DVD MENU Press to display the menu of

I ENTER Press to enter the value after

MEMORY Press to store a station.

J TOOLS Press to display options

K MUTING Press to activate muting

L TV VOL

+*/–

MASTER VOL +*/–

Press to select sound fields (MOVIE, MUSIC).

the receiver. Then, use V, v, B, b and to perform menu operations.

stereo reception.

mode.

player or DVD player (multidisc changer only).

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

selecting a channel, disc or track using the numeric buttons of the TV, VCR or satellite tuner.

applicable to the entire disc (e.g. disc protection), recorder (e.g. audio settings during recording), or multiple items on a list menu (e.g. erasing multiple titles). Press TOOLS and TV (O) at the same time to display options applicable to the TV.

function. Press MUTING and TV (O) at the same time to activate the TV’s muting function.

Press TV VOL +/– and TV (O) at the same time to adjust the TV volume level.

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

Name Function

M MENU Press to display the menus of

the VCR, DVD player, Blu-ray disc player or satellite tuner on the TV screen. Press MENU and TV (O) at the same time to display the TV’s menu. Then, use V, v, B, b and to perform menu operations.

N ./> Press to skips tracks of the CD

player, DVD player or Blu-ray disc player.

m/M Press to search tracks in the

forward/backward direction of the DVD player or to fast forward/rewind of the VCR, CD player or Blu-ray disc player.

H* Press to start playback of the

VCR, CD player, DVD player or Blu-ray disc player.

X Press to pause playback or

recording of the VCR, CD player, DVD player or Blu-ray disc player. (Also starts recording with components in recording standby.)

x Press to stop playback of the

VCR, CD player, DVD player or Blu-ray disc player.

TV CH +/– Press TV CH +/– and TV (O)

at the same time to select preset TV channels.

PRESET +/– Press to select preset stations

or preset channels of the VCR or satellite tuner.

TUNING +/– Press to scan a station.

O TV Press TV and the button you

want at the same time to activate the buttons with orange printing.

P REPLAY /

ADVANCE

Press to replay the previous

scene or fast forward the current scene of the VCR, Bluray disc player or DVD player.

STR-K790

Name Function

Q RETURN/

EXIT O

V/v/B/b

S DISPLAY Press to select the information

T -/-- Press -/-- and TV (O) at the

>10/

CLEAR Press to clear a mistake when

Press to return to the previous menu or exit the menu while the menu or on-screen guide of the VCR, DVD player, or satellite tuner is displayed on the TV screen. Press RETURN/EXIT O and TV (O) at the same time to return to the previous menu or exit the TV’s menu while the menu is displayed on the TV screen.

After pressing AMP MENU (E), DVD MENU (H), or MENU (M), press V, v, B or b to select the settings. Then, press to enter the selection for DVD MENU or MENU. Press also to enter the selection of the receiver, VCR, satellite tuner, Blu-ray disc player or DVD player.

displayed on the TV screen of the VCR, satellite tuner, CD player, Blu-ray disc player or DVD player. Press DISPLAY and TV (O) at the same time to select TV information displayed on the TV screen.

same time to select the channel entry mode, either one or two digits of the TV.

Press to select track numbers over 10 of the VCR, satellite tuner or CD player or to select channel numbers of the Digital CATV terminal.

you press the incorrect numeric buttons.

Name Function

U Numeric

buttons (number 5*)

V AUTO CAL Press to activate the Auto

W TV INPUT Press TV INPUT and TV (O)

SLEEP Press to activate the Sleep

*The number 5, MASTER VOL +, TV V OL +, and

H buttons have tactile dots. Use the tactile dots as references when operating the receiver.

Press to preset/tune to preset stations or to select track numbers of the CD player, Blu-ray disc player or DVD player or to select channel numbers of the VCR or satellite tuner. Press 0/10 to select track number 10. Press the numeric buttons and TV (O) at the same time to select the TV channels.

Calibration function.

at the same time to select the input signal (TV input or video input).

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

Notes

•Some functions explained in this section may not

work depending on the model.

•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 VIDEO 3 button on the remote is not available

for receiver operation.

STR-K790

SECTION 2

TEST MODE

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.

SOFTWARE VERSION DISPLAY MODE

The software version is displayed.

Procedure:

1. While depressing the DIMMER and the A UTO CAL buttons simultaneously, press the power ?/1 button to turn on the main power.

2. The model name, destination and the software version are displayed.

KEY CHECK MODE

Button check

Procedure:

1. While depressing the MUSIC and the AUTO CAL buttons simultaneously, press the power ?/1 button to turn on the main power. “REST 08” 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.

FLUORESCENT INDICATOR TUBE TEST MODE

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

Procedure:

1. While depressing the SLEEP and the AUTO CAL buttons simultaneously, press the power ?/1 button to turn on the main power.

2. All segments turn on.

LFE

L C R

SLSSR

SB SBRSBL

SP A SP B

;

D EX

PL II x;PL

OPT

HDMI COAX

DTS-ES 96 / 24

CAT

NEO:6 SAT D.RANGE

MEMORY

dB k Hz mft. MHz

RDS ST

MONO

SWAP ALL MODE

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

Procedure:

1. While depressing the DIMMER and the DISPLA Y b uttons 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 SLEEP and the DISPLAY buttons simultaneously, press the power ?/1 button to turn on the main power.

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

PRO TECTOR AUTO OFF

Procedure:

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

2. “ PROT. EVER” appears and switch off the set.

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:

1. Set the FUNCTION to AM. Turn off the main power.

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

3. Either the message “9 k STEP” or “10 kSTEP” appears. Select the desired step.

VACS CONTROL TEST MODE

The VACS feature of the amplifier is turned off purposely.

Procedure:

1. While depressing the MOVIE and the AUTO CAL buttons simultaneously, press the power ?/1 button to turn on the main power.

2. “VACS OFF” appears. (8 second)

3. Turn the INPUT SELECTOR dial.

k m MHz

RDS

LFE

SP B

NEO:6 D.RANGE MONOCOAX

4. Turn the INPUT SELECTOR dial once again.

SL SR

SB SBRSBL

;;

DTS

CAT

MEMORY

ft.

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.

DCAC FACTORY TEST MODE

DCAC Factory Test mode have two stages:

1. DCAC DSP Data Line Checking

2. DCAC board Checking

Start Pass Pass

DSP Data Line

Check

Factory Test System Setup

Auto Cal Mic

Check

Receiver

DCAC MIC

STR-K790

END

SPK Front Left

1. When power off : Press the three buttons MUSIC + DISPLAY + ?/1 . “DCAC[]FTM” appears. Afterward, press the DIMMER to start DCAC factory test mode.

1.DCAC DSP Data Line Checking

After press the DIMMER , 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)

STR-K790

Ver. 1.1

TUNER SECTION

[FM Auto Stop Check]

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.”

SECTION 4 DIAGRAMS

STR-K790

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

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 face 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.

These are omitted.

• Circuit Boards Location

DCAC board

HEADPHONE board

•Waveforms – DIGITAL Board –

STANDBY board

POWER board

DISPLAY board

HDMI SW board (AEP,UK)

HDMI BRIDGE board (AEP,UK)

DIGITAL board

MAIN board

IC1905 9 (MCLK1)

72 ns

1 V/DIV, 40 ns/DIV

IC1101 id (X1)

41.6 ns

1 V/DIV, 20 ns/DIV

IC1301 ws (XIN)

3.5 Vp-p

4.2 Vp-p

STR-K790

81.4 ns

4.2 Vp-p

1 V/DIV, 40 ns/DIV

1313

STR-K790

4-1. BLOCK DIAGRAM – MAIN SECTION –

DISPLAY /POWER SECTION

(Page 15)

DIGITAL

ANTENNA

VIDEO 1 IN/

PORTABLE AUDIO IN/

AUTO CAL MIC

SAT

SA-CD/CD

COAXIAL

OPTICAL

AEP,UK

AUDIO IN

DVD

VIDEO 2/

BD IN

75Ω

COAXIAL

AUTO CAL MIC

J2000

J400

J1301

IC1351

OPTICAL

AEP,UK

IC400

ANALOG SOUND

PROCESSOR

R-CH

D1501-1503

ADCC_INT

IC1401

AD CONVERTER

SYSCLK

DOUT

BCK LRCK

PDWN

PCM1609/1803_RST

LIN

PCM1609_ML

PCM1609_MC

PCM1609_MDI

PCM1609_MDO

SCKI

BCK

LRCK

DATA3

DATA1

DATA2

RST

MDI

MDO

IC1452

AUDIO CODEC

VOUT5

VOUT1

VOUT3

VOUT4

IC1301

DIGITAL AUDIO

I/F RECEIVER

XMCK

CK OUT

BCK

LRCK

DATAO

X1301

IC1101(1/2)

SYSTEM CONTROL

IC1905

AUDIO DSP

BCKI1

SCKOUT

X1502

13.9MHz

BCKO

SDO1

SDO2

SDO3

MCLK1

19LRCKO

IC1502

SRAM

IC1503

SELECTOR

BST

556

1 S 6

BST

BST_SEL

LRCKI1

18 SDI1

24AUDIO

D1301

DATA0

GP9

GP12

HD OUT

HD IN

HCLK

HCS

HACN

KFSI0

BCKI2

LRCKI2

SDI2

GP8

GP9

GP12

HDOUT

HDIN

HCLK

HCS

HACN

113

XRST

EXLOCK

MCLK2

12 9

XRST

IC1303

TUNER PACK

L CH

R CH

DO/SD/ST

RDS DATA

RDS INT

R-CH

TUNER +10V10V

CLK

TUNER SD

RDS DATA

SLATCH

TUNER_CLK

98 97 95 96 99 100 94 1

CLK

DO/SD/ST

TUNER_DATA

ERROR

5352

RDS CLK

XSTATE

XMODE

DIN2

DIN0

DOUT

CLK

ERROR

XSTATE

XMODE

CKSEL1

HDMI_S187HDMI_OED

HDMI_PRE

XIN XOUT

22 21

12.288MHz

VO ICL_DA

VOL IC_CL

INL5

INL4

INL3

INL2

INL1

ADIFL

LIN

SLIN

CIN

SWIN

DATA

CLOCK

IC1131

EEPROM

SDA SCL

5 6

29 30

SDA

AVCC

DVDD

LOUT

SLOUT

COUT

SWOUT

SCL

Q471

+3.3V

REG

+7V

IC502

WOOFER AMP

3 7

DISPLAY /POWER SECTION

(Page 15)

STR-K790

HDMI

VIDEO 2 / BD IN

DVD IN

CN5001

CN5002

IC5004

INPUT

DET

IC5005

INPUT

SELECT

IC5002

+5V REG

CN5003

OUT

HDMI

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

76,77

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

IC5001

HDMI

SELECT

OEB

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

HDMI +5.8V

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

• Signal Path

: FM

: ANALOG

: DIGITAL

: VIDEO

1414

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

STR-K790

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

• Signal Path

: FM

SLSL

MAIN

AUTO CAL MIC

X1101

24MHz

IC102

REMOTE

CONTROL RECEIVER

SECTION

(Page 14)

SECTION

(Page 15)

IC501

POWER AMP

+V OUT2

IN2

-V OUT2

IC601

POWER AMP

+V OUT2

IN2

-V OUT2

POWER AMP

IC701

+V OUT2

IN2

+V OUT1

IN1

IC2000

AMP

5 1

Q2001,2002

CONTROL

SIRCS

NF2

11-V OUT2

NF1

3-V OUT1

DC-CONTROL

FL_LAT

FL_CLK17FL_DATA

+7V

BUFFER

Q501,502

LIMITER

Q601,602 LIMITER

Q701,702

LIMITER

Q751,752

LIMITER

IC101

Q503

BOOSTER

AF POWER

PROTECT

R-CH

Q504

BOOSTER

Q603

BOOSTER

Q604

BOOSTER

Q703

BOOSTER

Q704

BOOSTER

Q753

BOOSTER

Q754

BOOSTER

ADCC

IC100

FL DRIVE

SEG1-17

DIN

CLK

STB

GRID1-11

Q505,506 CURRENT

DETECT

Q605,606 CURRENT

DETECT

Q705,706 CURRENT

DETECT

Q755,756 CURRENT

DETECT

29 31

FLUORESCENT

INDICATOR TUBE

Q881-883 PROTECT

SWITCH

PROTECTOR

FL101

R-CH

SR-CH

R-CH

SR-CH

SYSTEM CONTROL

IC1101(2/2)

F1 F2

D841 VACS

CONTROL

VAX CTRL

AF POWER

PROTECT

AF POWER

PROTECT

Q507

Q607

Q707

R-CH

D1111

D1110

D1107

SR-CH

HP_RY

C/REAR/SB_RY

FRONT_A_RY/DG51_FB

A/D1

FUNCTION

KEY

S114-119

Q608 RELAY DRIVE

Q708 RELAY DRIVE

Q509 RELAY DRIVE

RY551

RY601

RY701

RY502

A/D2

FUNCTION

KEY

S103,104

R-CH

HP_DETECT

VOL_ENCODER(B)

VOL_ENCODER(A)

3 2

ENCODER

RV102

MASTER VOLUME

TM602(1/2)

TM604(1/2)

TM602(2/2)

TM604(2/2)

HDMI_CTRL

ENC_B32ENC_A

3 2

ENCODER

RV101

INPUT

SELECTOR

FRONT

IC850

PROTECT

2 7

DET

POWER AMP

-B

SURROUND

SPEAKERS

IMPEDANCE USE 6-16Ω

CENTER

SUB

WOOFER

J790

PHONES

63FUSE DETECT

AVRH

AVCC

VCC3

VCC5

RSTX

STOP

POWER_RY

POWER_KEY

S152

?/1

IC1111

RESET

1 2

-B

FL101

-20V

TUNER

+10V

RELAY

AUDIO

+7V

AUDIO

+5V

AUDIO

-7V

AEP,UK

HDMI +3.3V

HDMI +5.8V

+5V

+3.3V

+2.5V

+3.3V

(STBY)

Q851,852

-B

SWITCH

Q801

-20V REG

IC1902

+10V

3 1

REG

IC821

+7V

1 3

REG

IC1001

+5V

3 1

REG

IC822

-7V

3 2

REG

IC5003

+3.3V

3 1

REG

IC5006

+5.8V

REG

IC1031

+5V

3 1

REG

IC1901

+3.3V

REG

+2.5V

REG

IC1904

+3.3V

3 1

REG

Q911

AC DET

D1001

D811

D920-923

D804-807

D910-913

D914

Q901 RELAY DRIVE

R803

T901

F901

AC IN

T900(AEP,UK)

D915

T902(US,CND)

RY901

STR-K790

1515

STR-K790

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

DIGITAL BOARD

JL008

C1362

IC1401

R1351

JL007

C1415

R1411

R1356

C1361

JL009

C1401

C1414

C1408

R1410

R1096

FB1306

FB1310

R1301

C1302

D1302

IC1303

R1357

JL011

FB1453

JL010

JL014

FB1403

C1404

C1409

FB1350

C1301

JR1005

C1304

C1303

R1359

R1303

C1405

R1304

JR1008

R1401

R1318

C1315

IC1301

R1360

JR1511

JR1020

R1305

R1469

FB1452

FB1405

R1407

R1306

C1002

• See page 13 for Circuit Boards Location.

:Uses unleaded solder.

345678

(SIDE A)

R1144

R1160

R1161

R1400

R1425

R1466

R1494

C1568

R1134

R1066

R1120

C1913

R1062

R1061

R1068

R1135

R1041

AEP,UK

R1011

R1067

R1065

R1059

R1015

R1014

R1042

US,CND R1095

R1012

R1076

R1151

R1153

R1013

R1010

R1140

R1947

R1058

R1094

R1121

R1152

R1154

R1948

AEP,UK

US,CND

D1001

C1102

IC1101

R1157

R1156

C1142

R1188

IC1131

R1185

R1084

R1125

C1118

R1194

C1031

X1101

C1620

R1635

C1119

R1164

R1201

IC1111

C1137

JL002

C1605

R1636

R1189

JL005

R1122

R1123

R1129

R1083

R1124

R1126

C1107

R1108

R1128

C1129

R1524

R1127

C1604

R1111

R1110

C1131

R1107

R1035

R1106

C1132

R1191

D1109

R1117

R1118

R1192

R1112

W1001

R1175

C1122

C1123

FB1308

R1946

C1067

R1077

C1068

1-872-321-

R1179

R1180

R1088

R1073

R1072

R1181

R1182

DIGITAL

BOARD

(SIDE B)

(Page 17)

(11)

R1321

R1319

R1556

R1307

D1301

R1502

R1313

R1325

R1310

R1308

R1309

FB1305

X1502

C1521

C1522

FB1503

IC1452

R1461

R1460

R1492

R1403

R1484

C1487

R1312

R1505

R1515

R1504

R1311

R1513

R1506

X1301

R1523

R1486

R1501

C1509

C1511

R1512

R1491

R1404

IC1502

RB1501

RB1506

R1514

IC1905

R1508

R1472

R1471

R1470

R1405

R1445

R1446

R1253

RB1502

RB1504

R1509

IC1503

R1475

R1476

R1406

R1435

C1434

R1436

R1555

RB1503

R1574

R1495

R1557

R1573

R1570

R1571

R1572

R1493R1408

R1464

C1569

RB1500

RB1507

RB1508

C1567

C1502

R1510

R1541

R1511

R1426

R1943

R1150

R1143

R1049

• Semiconductor Location

Ref. No.

D1001 B-6 D1109 C-7 D1301 C-3 D1302 C-2

Location

STR-K790

IC1101 D-6 IC1111 C-7 IC1131 E-6 IC1301 B-3 IC1303 C-3 IC1401 E-2 IC1452 D-3 IC1502 C-4 IC1503 D-5 IC1905 C-4

1616

STR-K790

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

DIGITAL BOARD

C1171

C1172

HS1901

IC1901

C1906

R1187

CL021

C1140

C1100

JL002

CL033

JL005

C1108

R1183

MAIN

BOARD

CNP504

(Page 25)

DISPLAY

BOARD

CNS102

(Page 31)

• Semiconductor Location

Ref. No.

D1003 D-3 D1004 D-3 D1107 C-6 D1108 C-6 D1110 C-6 D1111 C-7 D1501 C-3 D1502 C-3 D1503 D-3

IC1001 E-3 IC1031 B-7 IC1351 C-2 IC1901 B-7 IC1902 B-5 IC1904 B-6

Location

for FLASH PROGRAMMING

IC1031

CL027

CL029

CL031

TP1000

JL013

CNS504

CL035

CL026

C1032

CNS513

HS1903

C1905

C1908

W1001

CL022

CL028

R1105

R1186

CL030

CL032

R1078

CL034

R1184

• See page 13 for Circuit Boards Location.

(SIDE B)

STANDBY BOARD

CL025

C1149

C1139

CL036CL037

CNS502

CNP505

C1145

C1144

C1495

C1488

MAIN

BOARD

CNP502

(Page 25)

C1022

D1111

R1190

R1039

CNP506

D1107

C1138

R1193

AEP,UK

C1021

FB1101

D1110

C1299

IC1904

D1108

C1255

C1254

C1103

C1121

C1124

R1159

CNP801

(Page 26)

IC1902

FB1502

FB1501

C1518

:Uses unleaded solder.

CL016

CL017

C1517

C1458

C1515

C1525

C1516

JR1002

C1418

C1914

C1019

CL041

C1566

CL045

C1508

C1507

C1506

C1428

C1253

C1505

CNS507

CL019

C1519

C1513

C1468

C1547

AEP,UK

C1520

TUNER

C1120

C1514

C1504

CNS508

CL040

CNS501

COAXIAL

US,CND

C1510

C1503

CL020

CL018

C1501

C1004

C1438

JL001

MAIN

BOARD

CNP501

(Page 25)

CL012

D1004

C1491

AEP,UK

CL013

FB1302

C1313

R1314

C1310

C1309

D1502

D1003

345678

CL009

CL011

CL007

CNS509

R1261

R1323

C1312

R1530

D1501

D1503

C1494

C1450

C1455

C1001

IC1001

HDMI BRIDGE

BOARD

CNS199

(Page 23)

CL005

CL003

CL001

CL002

CL004

R1260

C1314

C1305

C1308

R1302

C1306

R1503

R1474

C1454

C1005

C1406

C1358

C1402

C1359

R1355

C1355

JL011

JL010

C1457

C1403

R1409

C1407

JR1009

JR1010

JL014

W1000

JL009

CL042

CL024

C1351

IC1351

J1301

JL008

R1352

CL043

1-872-321-

(11)

OPTICAL

VIDEO 2/ BD IN

DIGITAL

COAXIAL

DVD IN

DIGITAL

BOARD

(SIDE A)

(Page 16)

STR-K790

1717

+ 39 hidden pages

Sony STR-K790 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) –