Sony STRK-780 Service manual

STR-K680/K780

SERVICE MANUAL

Ver. 1.3 2006.08

• STR-K680 is the tuner and the amplifier section
in HT-DDW680, STR-K780 is the tuner and the
amplifier section in HT-DDW780/HTP-36DW.

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
Digital Theater Systems, Inc.

Amplifier section

Power Output
Models of area code SP, SP6
(6 ohms 1 kHz, THD 0.7%)
FRONT
CENTER

2)

SUR
(6 ohms 1 kHz, THD 10%)
FRONT
CENTER

2)

SUR

Models of area code AEP, UK, RU
(6 ohms 1 kHz, THD 0.7%)
FRONT
CENTER

2)

SUR
(6 ohms 1 kHz, THD 10%)
FRONT
CENTER

2)

SUR

1)

2)

: 70 W/ch

2)

: 70W
: 70 W/ch

2)

: 100 W/ch

2)

:100 W

: 100 W/ch

2)

: 85 W/ch

2)

: 85 W

8:5 W

/c

2)

: 122 W/ch

2)

: 122 W/c h

: 122 W

h

Models of area code AUS
(6 ohms 120 Hz–20 kHz, THD 0.09%)
FRONT
CENTER
SUR
(6 ohms 1 kHz, THD 0.7%)
FRONT
CENTER
SUR
(6 ohms 1 kHz, THD 10%)
FRONT
CENTER
SUR

Models of area code E51, MX
Power Output
(6 ohms 1 kHz, THD 0.7%)
FRONT
CENTER
SUR
(6 ohms 100 Hz, THD 0.7%)
SUB WOOFER
(6 ohms 1 kHz, THD 10%)
FRONT
CENTER
SUR
(6 ohms 100 Hz, THD 10%)
SUB WOOFER

Photo : STR-K780

SPECIFICATIONS

2)

: 50 W/ch

2)

: 50 W

2)

: 50 W/ch

2)

: 85 W/ch

2)

: 85 W

2)

: 85 W/ch

2)

: 122W/ch

2)

: 12 2 W

2)

: 122W/ch

1)

2)

: 70 W/ch

2)

: 70 W

2)

: 70 W/ch

2)

: 70 W

2)

: 100 W/ch

2)

: 100 W

2)

: 100 W/ch

2)

: 10 0 W

AEP Model

UK Model

STR-K780

E Model

STR-K680/K780

Australian Model

STR-K780

Models of area code AR
Power Output
(6 ohms 1 kHz, THD 0.7%)
FRONT
CENTER2): W1), 65 W
SUR2): W/ch1), 65 W/ch
(6 ohms 100 Hz, THD 0.7%)
SUB WOOFER
(6 ohms 1 kHz, THD 10%)
FRONT
CENTER2): W
SUR2):W/ch1), 90 W/ch
(6 ohms 100 Hz, THD 10%)
SUB WOOFER

1)

Measured under the following conditions:

Area code Power requirements

SP, SP6, AEP, UK, RU 230 V AC, 50 Hz

AR 230 V AC, 50 Hz

E51, AUS 240 V AC, 50 Hz

MX 127 V AC, 60 Hz

2)

Depending on the sound field settings and the
source, there may be no sound output.

3)

Measured under the following conditions:

Area code Power requirements

AR 220 V AC, 50 Hz

1)3)

2)

: W/ch1), 65 W/ch

2)

2)

: 100

2)

70
70
70

: W1), 65 W

70

W/ch1), 90 W/ch
100
100

:W

100

— Continued on next page —

1)

, 90 W

1)

, 90 W

3)

3)

3)

3)

3)

3)

3)

3)

9-887-140-04

2006H16-1
© 2006.08

MULTI CHANNEL AV RECEIVER

Sony Corporation

Home Audio Division
Published by Sony Techno Create Corporation

STR-K680/K780

CENTER FRONT

LR

LR

+ +

Ver. 1.2

Inputs (An alog)

SA-CD/CD,
VIDEO 1, 2, DVD

Sensitivity: 800 mV
Impedance: 50 kohms

Inputs (Digital)

DVD (Coaxial) Sensitivity: –

VIDEO 1
(Optical)

(VIDEO 1 is only K780)

, 2

Impedance: 75 ohms
Sensitivity: –

Impedance: –

Outputs (Analog)

SUB WOOFER Voltage: 2 V
(only K780)

Impedance: 1 kohm

Reproduction frequency range:

28 – 20,000 Hz

Tone

Gain levels ±6 dB, 1 dB step

FM tuner section

Tuning ran ge 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 AEP, UK, RU,

SP, SP6, AUS

With 9-kHz tuning scale:

531 - 1,602 kHz
Antenna Loop antenna
Intermediate Frequency

450 kHz

Models of area code E51
With 10-kHz tuning scale: 530 – 1,610 kHz
With 9-kHz tuning scale: 531 – 1,602 kHz
Models of are code AR, MX
With 10-kHz tuning scale: 530 – 1,610 kHz

4)

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 +,
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.

Video section

(only K780)

4)

Inputs/Outputs

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

Y: 1 Vp-p, 75 ohms
P

B/CB

/B-Y: 0.7 Vp-p,

75 ohms

R/CR

/R-Y: 0.7 Vp-p,

P
75 ohms

80 MHz HD Pass Through

General

Power requirements

Area code Power requirements

AEP, UK, RU 230 V AC, 50/60 Hz
AUS 240 V AC, 50 Hz
SP, SP6 230 – 240 V AC, 50/60 Hz

E51120/220/240 V AC,

50/60 Hz

4)

MARX1

27 V AC, 60 Hz

220-230V AC, 50/60 Hz

Power consumption

Area code Power consumpti on

AEP, UK, AUS, 190 W
E51, MX, RU, AR

SP, SP6

170 W

Power consumption (during standby mod e)

0.2 W

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

430 × 145 × 300 mm
including proj ecting parts

and controls

Mass (Approx.) 7.5 kg

7.8 kg

(K780)
(K680)

Design and specifications are subject to
change without notice.

•Abbreviation
AR : Argentina model
AUS: Australian model
E51 : Chilean and Peruvian models
MX : Mexican model
RU : Russian model
SP : Singapore model
SP6 : Singapore and Malaysia models

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).

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.

E51 model 2-661-458-2[]
AR model 2-661-458-3[]
MX model 2-661-458-4[]
AEP, UK, RU models 2-662-452-0[]
SP, SP6 models 2-662-452-1[]
AUS model 2-662-452-2[]

2

STR-K680/K780

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.

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.

TABLE OF CONTENTS

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

2. TEST MODE ............................................................... 11

3. DIAGRAMS

3-1. Block Diagram – MAIN Section –.................................. 14

3-2. Block Diagram – DISPLAY/POWER Section – ............. 15

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

3-4. Printed Wiring Board – DIGITAL Board (Side B) –...... 17

3-5. Schematic Diagram – DIGITAL Board (1/3) – .............. 18

3-6. Schematic Diagram – DIGITAL Board (2/3) – .............. 19

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

3-8. Printed Wiring Board – MAIN Board – ......................... 21

3-9. Schematic Diagram – MAIN Board (1/3) – ................... 22

3-10. Schematic Diagram – MAIN Board (2/3),

HEADPHONE Board –................................................... 23

3-11. Schematic Diagram – MAIN Board (3/3),

AC SELECT Board, ADCC Board,

STANDBY Board – ......................................................... 24

3-12. Printed Wiring Boards

– ADCC Board, HEADPHONE Board – ........................ 25

3-13. Printed Wiring Boards

– STANDBY Board, AC SELECT Board – .................... 26

3-14. Printed Wiring Board – DISPLAY Board – ................... 27

3-15. Printed Wiring Boards

– TUNING Board, POWER Board – .............................. 28

3-16. Schematic Diagram – DISPLAY Board,

TUNING Board, POWER Board – ................................. 29

3-17. Printed Wiring Board – VIDEO Board –........................ 30

3-18. Schematic Diagram – VIDEO Board – .......................... 31

4. EXPLODED VIEWS

4-1. Front Panel Section ......................................................... 39

4-2. Chassis Section................................................................ 40

5. ELECTRICAL PARTS LIST .................................. 41

3

STR-K680/K780

Receiver

Front panel

SECTION 1

GENERAL

This section is extracted
from instruction manual.

1 2 34 6 7 8

?/1

AUTO CAL MIC

PHONES

MEMORY

FM MODE TUNING

DISPLAY DIMMER

PRESET TUNING

+

+

VIDEO 1 VIDEO 2 DVD SA-CD/CD FM AM

5

AMP MENU ENTER MASTER

INPUT MODE

qjqkqlw; qgqh qf qaq;qsqd

Name Function

A ?/1 Press to turn the re ceiver

on or off.

B DISPLAY Press to select informat ion

displayed on the display.

C DIMME R Press to adjust the

brightness of the display.

D Remote sensor Receives signals from

remote commander.

E Display The current status of the

selected component or a
list of selectable items
appears her e.

F 2CH Press to select 2CH

STEREO mode.

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

MUSIC

I MASTER

VOLUME

J ENTER Press to store a station or

Press to select sound fields
(MOVIE, MUSIC).

Tur n to adj ust the volume
level of all speakers at the
same time.

enter the selection when
selecting the settin g s .

Name Function

K INPUT MODE Press to select the input

mode when the same
components are connected
to both digital and analog
jacks.

L I/i/U/u After pressing AMP

MENU (M), press I or i
and U or u to se lect the
settings.

M AMP MENU Press to display the menu

of the receiver.

N Input buttons Press one of the buttons to

select the component you
want to use.

O PRESET

TUNING +/–

P TUNING +/– Press to scan a station.
Q MEMORY Press to store a station.
R FM MODE Press to select FM

S PHONES jack Connects to a headpho ne.
T AUTO CAL MIC

jack

Press to select a pre s et
station.

monaural or stereo
reception.

Connects to the supplied
ECM-AC2 optimizer
microphone for the Auto
Calibration function.

2CH A.F.D. MOVIE MUSIC

VOLUME

9

4

About the indicators on the display

214356 7

STR-K680/K780

SW

LFE

SP

DIGITAL

;

;

PRO LOGIC II

SLEEP OPT COAX

L C R

SLSSR

qaqs

qf

Name Function

A SW Li ghts up when audio sign al is

B LFE Lights up when the disc being

C SP Lights up when the receiver is

D ;DIGITAL Lights up when Dolby Digital

E ; PRO

LOGIC (II)

F DTS Lights up when DTS signals are

G MEMORY Lights up when a memory

output fr om the SUB WOOFER
jack.

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

turned on. This indicator does
not light up if a headphone is
connected to the PHONES jack.

signals are input.

Note

When playing a Dolby Digital
format disc, be sure that yo u
have made digital connections
and that INPUT MODE is not
set to “ANALOG”.

“; PRO LOGIC” lights up
when the receiver applies Pro
Logic proces s i ng to 2 channel
signals in order to output the
center and surround channel
signals. “; PRO LOGIC II”
lights up when the Pro Logic II
Movie/Music decoder is
activated.

Note

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

input.

Note

When playing a D TS format
disc, be sure that you have made
digital connections and that
INPUT MODE is not s et to
“ANALOG”.

function, such as Name Input,
Preset Memory, et c., is

activated.

DTS

RDS

MEMORY

STEREO MONOD.RANGE

q; 9qd

8

Name Function

H Preset

station
indicators

I Tuner

indicators

J D.RANGE Lights up when dynamic range

K COAX Lights up when INPUT MODE

L OPT Lights up when INPUT MODE

M SLEEP Lights up when the Sleep Timer

N Playback

channel
indicators

L
R
C
SL
SR
S

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

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

etc.

Note

“RDS” appears for mo de ls of
area code AEP, UK onl y.

compression is activated.

is set to “ A UT O” and the source
signal is a di gital signal being
input through the COAXIAL
jack, or when INPUT MODE is
set to “COAX IN”.

is set to “ A UT O” and the source
signal is a di gital signal being
input through the OPTICAL
jack, or when INPUT MODE is
set to “OPT IN”.

function is activated.
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 component s obtained
by Pro Logic processing)

Example:

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

SW LFE

L C R

SL SR

5

STR-K680/K780

Rear

panel

STR-K780 model

VIDEO IN VIDEO IN

L

R

AUDIO IN

AUDIO IN

DVD

VIDEO 2

3

L

R

2

DIGITAL

OPTICAL

VIDEO 1

IN

VIDEO 2

IN

DVD IN

COAXIAL

ANTENNA

L

R

SA-CD/CD

AM

AUDIO IN

A DIGITAL INPUT section

OPTICAL
IN jack

COAXIAL IN
jack

41

MONITOR

VIDEO IN

VIDEO OUT

DVDINVIDEO 2INMONITOR

OUT

COMPONENT VIDEO

AUDIO

OUT

AUDIO IN

SUB

WOOFER

VIDEO 1

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

Y

B/CB

P
/B–Y

R/CR

P

/R–Y

LR

+ +

LR

SURROUND

SPEAKERS

+ +

CENTER FRONT

LR

LR

56

D COMPONENT VIDEO INPUT/

OUTPUT section

Green

Blue

Red

COMPONENT
VIDEO
INPUT/
OUTPUT
jack*

Connects to a DVD
player, TV, or a
satellite tuner . You
can enjoy high
quality image.

B ANTENNA section

FM
ANTENNA

AM
ANTENNA

Connects to the
FM wire antenna
supplied with this
receiver.

Connects to the
AM loop antenna
supplied with this
receiver.

C VIDEO/AUDIO INPUT/OUTPUT

section

White (L)

Red (R)

Yellow

AUDIO IN/
OUT jack

VIDEO IN/
OUT jack*

Connects the video
and audio jacks of
a VCR or a DVD
player.

E SPEAKER section

Connects to the
speakers.

Connects to the
sub woofer.

F AUDIO INPUT section

White (L)

AUDIO IN
jack

Red (R)

*You can watch the selected input image when y ou

connect the MON ITOR OUT ja ck to a TV monito r.

Connects to a CD
player, etc.

6

STR-K680/K780

Rear pan

el

STR-K680 model

1

DIGITAL

OPTICAL

VIDEO 2

IN

DVD IN

COAXIAL

ANTENNA

L

R

A DIGITAL INPUT section

OPTICAL
IN jack

COAXIAL IN
jack

AM

AUDIO IN

SA-CD/CD

AUDIO IN

DVD

3 42

L

R

AUDIO IN

VIDEO 2

L

R

AUDIO IN

VIDEO 1

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

+ +

SUB

SURROUND

WOOFER

SPEAKERS

LR

+ +

LR

CENTER FRONT

LR

LR

C AUDIO INPUT section

White (L)

Red (R)

AUDIO IN
jack

D SPEAKER section

Connects to a CD
player, etc.

B ANTENNA section

FM
ANTENNA

AM
ANTENNA

Connects to the
speakers and sub
woofer.

Connects to the
FM wire antenna
supplied with this
receiver.

Connects to the
AM loop antenna
supplied with this
receiver.

7

STR-K680/K780

Remote commander

You can use the supplied remote RM-AAU006
to operate the receiver and to control the Sony
audio/video components that the remote is
assigned to operate.

AV ?/1

1

TV

TV/VIDEO

AUTO

SLEEP

wg
wf

VIDEO 1 VIDEO 2 DVD SA-CD/CD

wd

ws

wa

w;

2CH A.F.D.

123
46
78

>10/

-

CLEAR

ql

qk

qj

Gg

RETURN/EXIT

TV CH –

REPLAY ADVANCE

PRESET –

.

TUNING –

TV

qh

?/1

AV

?/1

?/1

CAL

SYSTEM STANDBY

TUNER

AMP MENU

MOVIE MUSIC

DUAL MONO

5

0/10

F

f

<

FM MODE

D.TUNING

9

D.SKIP

MEMORY DVD MENU

ENTER

MUTING

TOOLSDISPLAY

TV VOL

MASTER VOL

MENU

TV CH +

PRESET +

<

>

TUNING +

HmM

Xx

(on/standby) switch
TV ?/1, ?/1

2

(

on/standby) switch

3

4
5

6

7

8
9

q;
qa
qs

qd

qf

qg

Name Function

A AV ?/1 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 (SYST EM
STANDBY).

Note

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

B TV ?/1 Press TV ?/1 and TV (P) at

the same time to turn the TV
on or off.

?/1 Press to turn the recei ver o n or

off.
To turn off all components,
press ?/1 and AV ?/1 (A) at
the same ti me (SYSTEM
STANDBY).

C Input buttons Press one of the buttons to

select the componen t you
want to use. When you press
any of the input buttons, th e
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)
DVDDVD player
SA-CD/CD Super Audio CD/CD

player

TUNER Built-in tuner

D AMP ME NU Press to display the menu of

the receiver. Then, use the
control buttons to perform
menu operations.

E MOVIE,

MUSIC

Press to select sound fields
(MOVIE, MUSIC).

8

STR-K680/K780

Name Function

F DUAL MONO Press to select the language

you want during digital
broadcast.

G FM MODE Press to select FM monaural

or stereo reception.

H D.TUNING Press to enter direct tuning

mode.

D.SKIP Press to skip disc of the CD

player or DVD player (multi­disc changer only).

I ENTER Press to enter the value after

selecting a channel, disc or
track using the numeric
buttons.

MEMORY Press to store a station.

J DVD ME NU Press to display the men u of

the DVD player on the TV
screen. Then, use the control
buttons to perform menu
operations.

K TOOLS Press to display options

applicable to the entire dis c
(e.g. disc protection), recorder
(e.g. audio settings durin g
recording), or multiple items
on a list menu (e.g. erasin g
multiple titles).

L MUTING Press to mute th e sound.
M TV VOL

+*/–

MASTER VOL
+*/–

N MENU Press to display the menus of

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

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

the VCR, DVD player, or
satellite tuner on the TV
screen. Then, use the control
buttons to perform menu
operations.

Name Function

O ./> Press to skips tracks of the CD

player, DVD player, or tape
deck.

REPLAY /
ADVANCE

m/M Press to

H* Press to start playback of the

X Press to pause playback or

x Press to stop playback of the

TV CH +/– Press TV CH +/– and TV (P)

PRESET +/– Press to select

TUNING +/– Press to scan a station.

P TV Press TV and the button you

Q RETURN/

EXIT O

<

Press to replay the previous

<

scene or fast forward the
current scene of the VCR or
DVD player.

–search tracks in the forward/

backward direction of the
DVD player.

–fastforwa rd/ rewind of the

VCR, CD player, or tape
deck.

VCR, CD player, D VD player,
or tape deck.

recording of the VCR, CD
player, DVD player, or tape
deck. (Also starts recording
with components in recording
standby.)

VCR, CD player, D VD player,
or tape deck.

at the same time to select
preset TV channels.

–preset stations.
–preset cha nne ls of the VCR

or satellite tuner.

want at the same time to
activate the button s wi th
orange printing.

Press to
–return to the previous menu.
–exit the menu while the

menu or on-screen guide of
the VCR, DVD player, or
satellite tuner is displayed
on the TV screen.

9

STR-K680/K780

Name Function Name Function

R Control

buttons

S DISPLAY Press to select the information

T -/-- Press -/-- an d TV (P) at the

x

>10/

CLEAR Press to

U Numeric

buttons
(number 5*)

V 2CH Press to select 2CH STEREO

W A.F.D. Press to select A.F.D. mode.
X AUTO CAL Press to activate the Auto

After pressing AMP MENU
(D), DVD MENU (J), or
MENU (N), press the control
button V, v, B or b to select
the settings. When you press
DVD MENU or MENU, press
the control button to enter the
selection.

displayed on the TV screen of
the VCR, satellite tuner, CD
player or DVD player.

same ti me to select the
channel entry mode, eith er
one or two digits of the TV.

Press to select
–track numbers over 10 of the

VCR, satellite tuner or CD
player.

–channel numbers of the

Digital CATV terminal.

–clear a mistake when you

press the incorrect num er ic
buttons.

– return to continuous

playback, etc. of the satellite
tuner or DVD player.

Press to
–preset/tune to preset

stations.

–select track numbers of the

CD player or DVD player.
Press 0/10 to select track
number 10.

–select channel numbers of

the VCR or satellite tuner.
Press the numeric buttons and
TV (P) at the same time to
select the TV channels.

mode.

Calibration function.

Y TV/VIDEO Press TV/VIDEO and TV

(P) at the same time t o select
the input signal (TV input or
video input).

SLEEP Press to activate the Sleep

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

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

H buttons have tactile dots. Use the ta ctile dots as
references whe n operating the rece iver.

Notes

Some functions explained in this section may not

work depending on the model.

The above explanati on is intended to s erve as an

example only. Therefore, depending on the
component, the above operation may not be
possible or may operate differently than described.

10

SECTION 2

TEST MODE

STR-K680/K780

FACTORY PRESET MODE

All preset contents are reset to the default setting.

Procedure:

1. While depressing the PRESET TUNING – and the
DIMMER buttons simultaneously, press the power ?/1
button to turn on the main power.

2. The message “FACTORY” appears and the present contents
are reset to the default values.

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 TUNING + 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.

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 PRESET TUNING – and the AM
buttons simultaneously, press the power ?/1 button to turn
on the main power.

2. All segments turn on.

dB
kHz
mft.
MHz

dB
kHz
mft.
MHz

kHz
mft.
MHz

MEMORY

DIRECT

MEMORY

DIRECT

MEMORY

DIRECT

SP A

D

D

LFE

SW

CR

L

SL S SR

SBL SB SBR

D

SP B SLEEP OPT COAX MULTI CH IN 96/24

D

DIGITALEX PRO LOGIC II x DTS-ES NEO:6 MPEG-2 AAC RDS

D.RANGE EQ STEREO MONO

3. Press either of the VIDEO1 or VIDEO2 or DVD or
SA-CD/CD or FM or AM button.

SP A

D

D

LFE

LSWR

S

SB

D

SP B SLEEP OPT COAX MULTI CH IN 96/24

D

DIGITALEX PRO LOGIC II x DTS-ES NEO:6 MPEG-2 AAC RDS

D.RANGE EQ STEREO MONO

4. Press either of the VIDEO1 or VIDEO2 or DVD or
SA-CD/CD or FM or AM button once again.

SP A

D

D

D

DIGITALEX PRO LOGIC II x DTS-ES NEO:6 MPEG-2 AAC RDS

D.RANGE EQ STEREO MONO

C

SL SR

SBL SBR

D

SP B SLEEP OPT COAX MULTI CH IN 96/24

5. Press either of the VIDEO1 or VIDEO2 or DVD or
SA-CD/CD or FM or AM b utton once again. All segments
turn off.

SOUND FIELD CLEAR MODE

The preset sound field is cleared when this mode is activa ted. 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 “SF. CLR.” appears and initialization is
performed.

SOFTWARE VERSION DISPLAY MODE

The software version is displayed.

Procedure:

1. While depressing the PRESET TUNING – and the < 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 < and the A.F.D. buttons simulta­neously, press the power ?/1 button to turn on the main
power.
“REST 25” 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.

SHIPMENT MODE

All preset contents are reset to the default setting.

Procedure:

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

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

PROTECTOR

Procedure:

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

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

DECODE AUTO ALL

Procedure:

1. While depressing the PRESET TUNING – and the + but­tons simultaneously, press the power ?/1 button to turn on
the main power.

2. “DEC. TEST” appears and switch off the set.

VACS CONTROL

Procedure:

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

2. “VACS OFF” appears. (8 second)

11

STR-K680/K780

Ver. 1.3

SWAP ALL MODE

Procedure:

1. While depressing the PRESET TUNING – 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.)

ADCC FACTORY TEST MODE

ADCC Factory Test mode have two stages:

1. ADCC DSP Data Line Checking

2. ADCC AUTO CAL MIC board Checking

Start Pass Pass

DSP Data Line

Check

Factory Test System Setup

Auto Cal Mic

Check

END

Receiver

ADCC MIC

SPK Front Left

1. When power off :

Press the three buttons < + DISPLAY + ?/1 .
(If it doesn’t operate, please press DISPLAY again afetr 2
seconds.)
Afterward, press the DIMMER to start DCAC factory test
mode.

1. ADCC 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 → D1112 or R1198 problem

x = 2 → D1113 problem
x = 3 → D1114 problem

2. ADCC AUTO CAL MIC board Checking

Connect front left speaker of the receiver and AUTO CAL
microphone. Turn MASTER VOLUME 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)

12

SECTION 3
DIAGRAMS

STR-K680/K780

Ver. 1.2

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 waveforms 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 v ariations ma y 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

•Abbreviation
AR : Argentina model
AUS:Australian model
E51 : Chilean and Peruvian models
MX : Mexican Model
RU : Russian model
SP : Singapore model
SP6 : Singapore and Malaysia models

4

W or less unless otherwise

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.

C

Q

B

E

B

These are omitted.

CE

These are omitted.

• Circuit Boards Location

ADCC board

TUNING board

HEADPHONE board

•Waveforms
– DIGITAL Board –

1

IC1501 9 (MCLK1)

POWER board

STANDBY board

DISPLAY board

AC SELECT board (E51 only)

VIDEO board (K780 only)

DIGITAL board

MAIN board

STR-K680/K780

72 ns

1 V/DIV, 40 ns/DIV

2

IC1101 id (X1)

41.6 ns

1 V/DIV, 20 ns/DIV

3

IC1301 ws (XIN)

81 ns

1 V/DIV, 40 ns/DIV

1313

3.4 Vp-p

4.2 Vp-p

4.4 Vp-p

STR-K680/K780

Ver. 1.1

3-1. BLOCK DIAGRAM – MAIN SECTION –

ANTENNA

TN1

FM

75 Ω

COAXIAL

AM

TUNER PACK

FM

AM

FM SIG OUT

R CH

ST-DO

ST-DI

STEREO

TUNED

MUTING

RDS_INT

RDS_DATA

L CH

CLK

CE

AEP,UK,RU

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

• Signal Path

: FM

: ANALOG

: DIGITAL

R-CH
TUNER +10V10V

73

17

16

74

76

75

78

43

52

53

AUTO CAL MIC

IC1101(1/3)

SYSTEM CONTROLLER

DO

TUNER-DATA

T.SERIAL CLK

SLATCH

STEREO

TUNED

MUTE

RDS_SIG

RDS_CLK

RDS_DATA

J2000

DIGITAL

VIDEO 1

VIDEO 2

DVD

SA-CD/CD

COAXIAL

OPTICAL

OPTICAL

K780

AUDIO IN

AUDIO IN

AUDIO IN

AUDIO IN

DVD

IN

VIDEO 1

IN

VIDEO 2

IN

IC2000(1/2)

57

J402

J400

J1301

IC1352

OPTICAL

IN

IC1353

OPTICAL

IN

IC2000(2/2)

3

IC400

ANALOG SOUND

PROCESSOR

10

INL1

DVDD

26

2

INL5

LOUT

49

4

INL4

SLOUT

COUT

SWOUT

IC1131

EEPROM

SDA SCL

5 6

29 30

SDA

40

33

32

SCL

6

INL3

8

INL2

IC1401

AD CONVERTER

13

LIN

IC1301

DIGITAL AUDIO

93

XSTATE

XMODE

CKSEL1

5

3

4

35

36

38

37

34

17

48

47

I/F RECEIVER

DIN2

DIN0

DIN1

DO

DI

CLK

CE

ERROR

XSTATE

XMODE

CKSEL1

XIN XOUT

22 21

X1301

12.288MHz

XMCK

CK OUT

LRCK

DATAO

AUDIO

20

IC1501

AUDIO DSP

22

SCK OUT

13

BCK

14

15

16

24

DATA0

D1301

92

LRCK_SW

2

18

GP9

19

HD OUT

6

20

HD IN

IC1503

SELECTOR

SB

AY

1 5

4

5

HCS

HCLK

HACN

2

7PM3

KFSI0

29

BCKI2

28

LRCKI2

17

BCKII

15

LRCKII

30

SDI2

19

LRCK0

69

GP8

68

GP9

35

HD OUT

33

HD IN

34

HCLK

36

HCS

32

HACN

PM

113
56

BST

2

XRST

59

EXLOCK

37

GP12

6

8

BST

XRST

GP12

14

BCKO

20

19LRCKO

18SDI1

SDO1

23

SDO2

24

SDO3

25

MCLK1

9

MCLK2

12

IC1101(2/3)

SYSTEM CONTROLLER

IC1303(2/2)

IC1303(1/2)

35

62

1

45

98 97 95 96 99 100 94 1

DI

CE

DO

CLK

ERROR

ADCC_ANA_OGUE_IN

16

13

14

15

IC1502

SRAM

X1502

13.9MHz

SYSCLK

LRCK

BCK

DOUT

D1113

1

RST

6

10

57

ADCC_DSP_IN

D1112

12

13

14

PCM1608_MC

PCM1608_ML

PCM1608_RST

38

40

41

47

45

46

D1114

37

36

35

34

33

15

PCM1608_MDI

PCM1608_MDO

IC1452

AUDIO CODEC

SCK1

BCK

LRCK

DATA3

DATA1

DATA2

RST

ML

MC

MDI

MDO

VOUT5

VOUT1

VOUT3

VOUT4

10

14

12

11

9

21

22

PCM1800_RST

VOL_DATA_LATCH

VOL_CLK

ADIFL

16

LIN

19

SLIN

20

CIN

21

SWIN

24

DATA

25

CLK

Q471

+3.3V REG

IC502

WOOFER AMP

37

K680

+7V

L

SL

SL

DISPLAY/
POWER

A

SECTION
(Page 15)

C

SBL

SW

888786

: VIDEO

STR-K680/K780

K780

COMPONENT

VIDEO

VIDEO 2

IN

DVD

11

4S22S213

M

J201

J251
(1/2)

Y

PB/CB/B-Y

PR/CR/R-Y

Y

PB/CB/B-Y

IN

PR/CR/R-Y

3

CH1 IN2

9

CH2 IN2

14

CH3 IN2

5

CH1 IN3

11

CH2 IN3

12

CH3 IN3

4

SW1 2SW2

IC251

VIDEO AMP

CH1 OUT

CH2 OUT

CH3 OUT

J251
(2/2)

22

20

18

Y

PB/CB

/B-Y

PR/CR

/R-Y

MONITOR

OUT

CONPONENT

VIDEO

VIDEO 1

VIDEO 2

(1/2)

VIDEO IN

J203

DVD

VIDEO IN

VIDEO IN

12

1

3

S1

IC203

V3

VIDEO AMP

V1

V2

MON

10

IC807

8

+5V

-5V

+5V REG

IC804

14

-5V REG

J201(2/2)

VIDEO OUT

MONITOR

+ V

- V

1414

3-2. BLOCK DIAGRAM – DISPLAY/POWER SECTION –

IC501

POWER AMP

+V OUT2

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

• Signal Path

FL101

FLUORESCENT

INDICATOR TUBE

F1 F2

14 29

42 31

SEG1-16

GRID1-12

: FM

MAIN
SECTION
(Page 14)

L

SLSL

A

C

SBL

SW

8

IN2

-V OUT2

IC601

POWER AMP

+V OUT2

IN2

8

-V OUT2

IC701

POWER AMP

+V OUT2

8

IN2

+V OUT1

6

IN1

STR-K680/K780

Ver. 1.1

R-CH

RY502

Q608

RELAY

DRIVE

Q509

RELAY

DRIVE

Q508

RELAY

DRIVE

Q708

RELAY

DRIVE

Q560

RELAY
DRIVE

RY601

RY501

RY701

R-CH

R-CH

RY702

R-CH

TM600(1/2)

L

R

TM601(1/2)

L

R

TM602

L

R

TM600(2/2)

TM601(2/2)

J403

12

Q501,502
LIMITER

NF2

9

11

12

Q601,602
LIMITER

NF2

9

11

12

Q701,702
LIMITER

NF2

9

11-V OUT2

2

Q571,572
LIMITER

NF1

5

3-V OUT1

Q503

BOOSTER

Q504

BOOSTER

Q603

BOOSTER

Q604

BOOSTER

Q703

BOOSTER

Q704

BOOSTER

Q754

BOOSTER

Q753

BOOSTER

Q505,506
CURRENT

DETECT

Q605,606
CURRENT

DETECT

Q705,706
CURRENT

DETECT

Q755,756
CURRENT

DETECT

Q507

AF POWER

PROTECT

Q607

AF POWER

PROTECT

Q707

AF POWER

PROTECT

D529

D729

AUDIO OUT

J700

PHONES

FRONT

SURROUND

SURROUND

CENTER

SUB

WOOFER

SUB WOOFER

K680

K680

K780

SPEAKERS

IMPEDANCE USE 6-16Ω

K780

+3.3V

+2.5V

+5V

IC1901

+3.3V

2

REG

+2.5V

5

REG

IC1031

+5V

3 1

REG

4

D804-807

T901

DIN8CLK9STB

7

IC101

BUFFER

59

60

FL_DATA

47

FL_LAT

FL_CLK

X0

82 83

X1101

24MHz

POWER AMP

IC1001

+5V

3 1

REG

AEP,UK,RU

Q860-862

+B
SWITCH

–B

FL101

–20V

RELAY

+B

AUDIO

+7V

AUDIO

–7V

TUNER

+10V

TUNER

+3.3V

Q851,852

–B

SWITCH

Q801

–20V REG

+B

–B

IC821

+7V

1 3

REG

IC822

–7V

3 2

REG

IC1902

+10V

3 1

REG

IC1071

+3.3V

3 1

REG

IC1904

+3.3V

3 1

REG

D811

R803

D920-923

D910-913

Q901
RELAY
DRIVE

E51

S901

VOLTAGE

SELECT

F1

F2

T902

AC
IN

D915D914

RY901

IC100

FL DRIVE

62

66

68

HP RY

REAR RY

FRONT RY

SYSTEM CONTROLLER

IC1101(3/3)

X1

A/D0

38

FUNCTION

KEY

S131-139

A/D1

39

FUNCTION

KEY

S100-108

A/D2

40

FUNCTION

KEY

S110-116

VOL_ENC(B)65VOL_ENC(A)

64

3 1

ENCODER

RV102

MASTER
VOLUME

67

C/SW RY

61

PROTECTOR

POWER KEY

56

S152

46

VACS

?/1

D883

Q881-883

PROTECT

SWITCH

55

HP DETECT

FUSE DETECT

POWER RY

58

SIRCS

AVCC

VCC3

VCC5

RSTX

STOP

IC850(1/2)

IC850(2/2)

57

21

63

IC102

REMOTE

54

35

84

23

77

48

1

CONTROL
RECEIVER

+3.3V(STBY)

IC1111

RESET

1 2

POWER AMP

AUDIO

+5V

+B

AC DET

Q911

STR-K680/K780

1515

STR-K680/K780

Ver. 1.3

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

• See page 13 for Circuit Boards Location.

:Uses unleaded solder.

A

B

C

D

E

12

K780

VIDEO

34567

BOARD

CNS250

(Page 30)

M

1

5

R1356

C1361

C1401

R1352

R1362

R1353

C1302

R1303

R1301

C1303

C1304

FB1306

D1302

C1360

R1358

C1357
R1357

C1408

C1405

IC1401

R1318

C1315

R1363

1

C1301

12

R1304

JR1511

R1305

R1359

IC1303

R1402

FB1405

CNS509

R1316 R1315

48

IC1301

37

13 24

R1310

R1306

R1360

JR1020

R1307

R1308

R1504

R1474

R1401

FB1452

R1407
R1403

36

25

C1310

C1309

FB1305

R1309

D1301

X1502

R1502

R1503

R1506

R1505

R1556

C1494

IC1452

36

37

48

1

C1002

R1313

FB1503

12

R1460

R1312
R1311

X1301

JR1502

25

24

13

R1470

R1461

C1487

FB1502

C1522 R1515

R1523

R1484

C1251

C1516

R1555

C1511

C1521

R1531

R1471

R1501

1

30

C1253

R1541

120

IC1501

31

R1446

R1486

IC1502

R1517

R1552

R1521

R1519

R1509

R1475

R1472

C144

R1445

C1566

R1476

91

R1436

90

61

60

R1508

R1547

R1546

R1571

R1572

R1570

R1574

R1573

R1528

R1527

R1543

R1511

IC1503

R1529

R1510

R1154

R1464

C1432

R1435

R1426

AEP,UK

R1545

R1544

R1152

C1063

R1542

R1162

R1161

R1155

R1520

R1540

R1539

R1538

R1121

R1153

R1466

R1522

R1537

R1532

R1150

R1144
R1143

R1160

R1518

R1536

R1534

R1044

R1149

R1151

C1913

R1554

R1553

R1525

R1136

R1535

R1134

R1533

R1137

C1147

R1168

C1422

R1425

IC1131

R1526

R1135

R1042

R1142

C1148

R1551

R1041

R1140

R1550

R1066

R1549

R1068

R1067

R1120

R1548

R1065

D1001

R1115

R1113

R1119

IC1101

R1098

C1495

IC1111

13

X1101

R1127

R1524

R1635

R1082

R1073

R1458

FB1308

45

C1107

R1105

R1186

R1122

R1123

R1129

R1124

R1094 R1095

R1190 R1128

R1072

R1071

R1459

R1109

R1076

R1088

R1107

R1106

R1059

R1108

EXCEPT
AEP,UK,RU

R1077

AEP,UK,RU

R1058

R1112

R1175

R1035

R1083

R1078

R1180

C1123

C1124

R1179

C1122

C1620

R1636

R1097

R1159

R1605

• Semiconductor
Location

Ref. No.

D1001 C-5
D1301 C-3
D1302 C-2

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

Location

STR-K680/K780

1616

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

• See page 13 for Circuit Boards Location.

STR-K680/K780

Ver. 1.3

:Uses unleaded solder.

A

B

C

D

E

F

12

C1905

2

3

MAIN

BOARD

CNP503

(Page 21)

EXCEPT
AEP,UK,RU

A

B

MAIN

BOARD

CNP503

(Page 21)

C

DISPLAY

BOARD

CNS100

(Page 27)

JR1202

R1187

C1143

5

IC1901

R1201

5

CNP504

1

CNS504

C1908

CNS505

C1906

1

C1108

1

D1110

CNP503

C1103

C1102

C1100

C1140

K780

3456789

MAIN

BOARD

1

3

R1493

C1418

C1064

CN504

(Page 21)

C1507

C1506

R1495

C1428

C1569

C1567

C1519

C1513

R1514

C1508

C1505

C1472

C1468

TN1

TUNER UNIT

AEP,UK,RU

CNS508

R1252

C1252

R1251

C1517

C1520

C1515

C1509

C1510

C1514

C1501

C1503

C1504

C1491

R1491

C1547

C1438

CNS501

FB1302

FB1501

C1518

R1513

C1483

C1448

R1260
R1261

R1512

R1492

R1314

C1005

C1313

C1312

C1460

3

1

IC1001

D1112

C1454

C1001

C1314

C1308

D1113

D1114

FB1453

C1450

R1302

C1305

R1198

D1004

C1457

C1406

C1004

C1306

C1359

D1003

C1403

C1404

C1409

IC1352

C1352

C1353

C1358

IC1353

C1402

C1407

C1355

R1355

• Semiconductor
Location

Ref. No.

D1003 D-7
D1004 D-7
D1107 C-3
D1110 C-3
D1111 C-3
D1112 D-6
D1113 D-6
D1114 D-7

K780

IC1001 F-6
IC1031 B-3
IC1071 B-5
IC1352 C-7

3

VIDEO 1

1

3

IN

OPTICAL

IC1353 C-7
IC1901 C-3
IC1902 B-4
IC1904 C-3

Location

VIDEO 2

1

IN

DIGITAL

C1362

C1356

J1301

DVD IN

COAXIAL

D1111

4

C1137

C1138

R1163

IC1031

C1031

3

C1032

3

D1107

C1022

R1189

C1299

C1130

C1129

R1039

C1604

C1120

R1164

1

1

C1021

IC1904

FB1101

C1119

C1118

R1194

CNS502

C1121

C1142

R1167

5

C1139

R1193

R1156

R1096

STANDBY

BOARD

CNP801

(Page 26)

IC1902

1

CNP505

6

8

R1099

R1117

C1254

C1255

C1149

R1157

C1206

R1049

1

3

R1118

D E

C1914

C1525

R1494

C1458

IC1071

AEP,UK,RU

C1502

C1462

C1568

STR-K680/K780

F

MAIN

BOARD

CNP502

(Page 21)

G

1717

MAIN

BOARD

CNP501

(Page 21)