Sony STR-K790 - Lifier Service Manual
SERVICE MANUAL
Sony Corporation
Home Audio Division
Published by Sony Techno Create Corporation
US Model
Canadian Model
AEP Model
UK Model
FM STEREO/FM-AM RECEIVER
9-887-542-02
2007C16-1
© 2007.03
Ver. 1.1 2007.03
SPECIFICATIONS
STR-K790
• 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.
— Continued on next page —
AUDIO POWER
SPECIFICATIONS
POWER OUTPUT AND T OTAL
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
1)
Stereo mode (rated) (6 ohms 1 kHz, THD 1%)
85 W + 85 W
Surround mode
2)
(reference)
(6 ohms 1 kHz, THD 10%)
RMS output
FRONT:133 W
per channel
CENTER: 133 W
SURROUND: 133 W
per channel
Surround mode
2)
(reference)
(6 ohms 100 Hz, THD 10%)
SUB WOOFER: 135 W
1)
Measured under the following conditions:
Area code Power requirements
US, Canadian 120 V AC, 60 Hz
AEP, UK 230 V AC, 50 Hz
2)
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
4)
With 9-kHz tuning scale:
531 – 1,710 kHz
4)
Models of area code AEP, UK
With 9-kHz tuning scale:
531 – 1,602 kHz
Antenna Loop antenna
Intermediate frequency
450 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 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
2
STR-K790
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 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 manufacturers’ 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 have an accurate lo w-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)
Fig. A. Using an AC voltmeter to check AC leakage.
1.5 k
Ω
0.15 µF
AC
voltmete
r
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
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 SHO WN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
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 DANS LES SUPPLÉMENTS
PUBLIÉS PAR SONY.
Power consumption
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)
Area code Power consumption
US 210 W
Canadian 290 VA
AEP, UK 220 W
Design and specifications are subject to
change without notice.
3
STR-K790
TABLE OF CONTENTS
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
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).
Any differences in operation, according to the area
code, are clearly indicated in the text, for example,
“Models of area code AA only”.
FRONTCENTER
LR
LR
SPEAKERS
Area code
Parts No.
MODEL IDENTIFICATION
– Rear Panel –
Model Part No.
US model 2-896-343-4[]
Canadian model 2-896-343-5[]
AEP, UK models 2-896-343-6[]
4
STR-K790
SECTION 1
GENERAL
Front panel
Receiver
VIDEO 1 IN/
PORTABLE AUDIO IN/
AUTO CAL MIC
PHONES
INPUT SELECTOR
A.F.D. MOVIE MUSIC
?/1
9
q;
qf
qaqd
1
2 3 4
765 8
qs
DIMMER SLEEP 2CH
DISPLAY
MASTER VOLUME
AUTO CAL
Name Function
A ?/1
(on/standby)
Press to turn the receiver
on or off.
B DIMMER Press to adjust the
brightness of the display.
C SLEEP Press to activate the Sleep
Timer function and the
duration which the receiver
turns off automatically.
D 2CH Press to select 2CH
STEREO mode.
E Display The current status of the
selected component or a
list of selectable items
appears here.
F DISPLAY Press to select information
displayed on the display.
G AUTO CAL Press to activate the Auto
Calibration function.
Name Function
H MASTER
VOLUME
Turn to adjust the volume
level of all speakers at the
same time.
I INPUT
SELECTOR
Turn to select the input
source to playback.
J Remote sensor Receives signals from
remote commander.
K MOVIE, MUSIC Press to select sound fields
(MOVIE, MUSIC).
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
–Connects to the supplied
optimizer microphone for
the Auto Calibration
function.
–To connect a portable
audio such as MP3
player, etc..
5
STR-K790
About the indicators on the display
SW
LFE
LCR
SL S SR
;
D
;
PLII
;
PL OPT DTS MEMORY RDS ST
MONOD.RANGECOAX
1 2 3 4 5 6 87
qs qa 9q;
Name Function
A SW Lights up when audio signal is
output from the SUB WOOFER
jack.
B LFE Lights up when the disc being
played back contains an LFE
(Low Frequency Effect)
channel and the LFE channel
signal is actually being
reproduced.
C ; D Lights up when the receiver is
decoding Dolby Digital signals.
D ; PL/
; PLII
“; 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.
E OPT Lights up when VIDEO 2 input
is selected. However,
“UNLOCK” appears on the
display if no digital signal is
input through the OPTICAL
jack.
Name Function
F DTS Lights up when the receiver is
decoding DTS signals.
G MEMORY Lights up when a memory
function, such as Name Input,
Preset Memory, etc., is
activated.
H Tuner
Indicators
Lights up when using the
receiver to tune in radio stations,
etc.
Note
“RDS” appears for models of
area code AEP, UK only.
I Preset
station
indicators
Lights up when using the
receiver to tune in radio stations
you have preset. For details on
presetting radio stations.
J D.RANGE Lights up when dynamic range
compression is activated.
K COAX Lights up when DVD input is
selected. However,
“UNLOCK” appears on the
display if no digital signal is
input through the COAXIAL
jack.
L Playback
channel
indicators
L
R
C
SL
SR
S
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
SW
LFE
LCR
SL SR
6
STR-K790
US, Canadian models
Rear panel
*The numbers of the SUB WOOFER terminals
varies depending on the models.
1 2
43
SUB
WOOFER
SURROUND
DVD
IN
DIGITAL
OPTICAL
VIDEO 2/
BD IN
COAXIAL
ANTENNA
LR
LR
AM
SA-CD/CD
L
R
AUDIO INTVAUDIO IN
SAT
AUDIO IN
SPEAKERS
FRONTCENTER
LR
LR
SPEAKERS
A DIGITAL INPUT section
OPTICAL
IN jack
Connects to a DVD
player, etc. The
COAXIAL jack
provides a better
quality of loud
sound.
COAXIAL IN
jack
B ANTENNA section
FM
ANTENNA
jack
Connects to the
FM wire antenna
supplied with this
receiver.
AM
ANTENNA
terminals
Connects to the
AM loop antenna
supplied with this
receiver.
C AUDIO INPUT section
AUDIO IN
jacks
Connects to a CD
player, etc.
D SPEAKER section
Connects to the
speakers and sub
woofer*.
White (L)
Red (R)
AEP, UK models
*You can watch the selected input image when you
connect the HDMI OUT jack to a TV or projector.
VIDEO 2 /BD INDVD IN OUT
HDMI
1 2
3
4
DVD
IN
DIGITAL
OPTICAL
VIDEO 2/
BD IN
COAXIAL
ANTENNA
AM
SA-CD/CD
L
R
AUDIO INTVAUDIO IN
SAT
AUDIO IN
FRONTCENTER
LR
LR
SPEAKERS
SURROUND
SUB
WOOFER
LR
LR
SPEAKERS
A DIGITAL INPUT section
OPTICAL
IN jack
Connects to a DVD
player, etc. The
COAXIAL jack
provides a better
quality of loud
sound.
COAXIAL IN
jack
HDMI IN/
OUT jacks*
Connects to a DVD
player, etc. The
image and the
sound are output to
a TV or a projector.
B ANTENNA section
FM
ANTENNA
jack
Connects to the
FM wire antenna
supplied with this
receiver.
AM
ANTENNA
terminals
Connects to the
AM loop antenna
supplied with this
receiver.
C AUDIO INPUT section
AUDIO IN
jacks
Connects to a CD
player, etc..
D SPEAKER section
Connects to the
speakers and sub
woofer.
White (L)
Red (R)
7
STR-K790
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
Remote commander
123
46
78
0/10
ENTER
9
SYSTEM STANDBY
TV INPUT
SLEEP
AUTO
CAL
TV
?/1
AV
?/1
VIDEO 1 VIDEO 2 VIDEO 3 DVD
2CH A.F.D.
RETURN/EXIT
TV CH –
PRESET –
TV CH +
PRESET +
TUNING –
TV
TUNING +
REPLAY ADVANCE
MENU
MOVIE MUSIC
MEMORY DVD MENU
CLEAR
TOOLSDISPLAY
MUTING
TV VOL
MASTER VOL
FM MODE
D.TUNING
D.SKIP
AMP MENU
SAT TV SA-CD/CD TUNER
?/1
-
F
Gg
f
.
HmM
Xx
<
<
>
5
>10/
wd
qj
ql
qk
w;
wa
ws
qg
1
3
2
6
7
8
q;
9
qf
qs
qa
4
5
qd
qh
Name Function
A TV ?/1
(on/standby)
Press TV ?/1 and TV (O) at
the same time to turn the TV
on or off.
AV ?/1
(on/standby)
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).
B ?/1
(on/standby)
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).
C Input buttons Press one of the buttons to
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
Insert two R6 (size-AA) batteries in the
RM-AAU013 remote commander.
Observe the correct polarity when installing
batteries.
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.
Inserting batteries into the
remote
8
STR-K790
Name Function
D 2CH Press to select 2CH STEREO
mode.
A.F.D. Press to select A.F.D. mode.
MOVIE,
MUSIC
Press to select sound fields
(MOVIE, MUSIC).
E AMP MENU Press to display the menu of
the receiver. Then, use V, v, B,
b and to perform menu
operations.
F FM MODE Press to select FM monaural or
stereo reception.
G D.TUNING Press to enter direct tuning
mode.
D.SKIP Press to skip disc of the CD
player or DVD player (multidisc changer only).
H DVD MENU Press to display the menu of
the DVD player on the TV
screen. Then, use V, v, B, b
and to perform menu
operations.
I ENTER Press to enter the value after
selecting a channel, disc or
track using the numeric
buttons of the TV, VCR or
satellite tuner.
MEMORY Press to store a station.
J TOOLS Press to display options
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.
K MUTING Press to activate muting
function.
Press MUTING and TV (O)
at the same time to activate the
TV’s muting function.
L TV VOL
+*/–
Press TV VOL +/– and TV
(O) at the same time to adjust
the TV volume level.
MASTER VOL
+*/–
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.
<
<
9
STR-K790
*The number 5, MASTER VOL +, TV V OL +, and
H buttons have tactile dots. Use the tactile dots as
references when operating the receiver.
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.
Name Function
Q RETURN/
EXIT O
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.
R
V/v/B/b
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.
S DISPLAY Press to select the information
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.
T -/-- Press -/-- and TV (O) at the
same time to select the
channel entry mode, either
one or two digits of the TV.
>10/
x
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.
CLEAR Press to clear a mistake when
you press the incorrect
numeric buttons.
Name Function
U Numeric
buttons
(number 5*)
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.
V AUTO CAL Press to activate the Auto
Calibration function.
W TV INPUT Press TV INPUT and TV (O)
at the same time to 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.
10
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 ated, 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.
3. Turn the INPUT SELECTOR dial.
4. Turn the INPUT SELECTOR dial once again.
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.
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.
PROTECTOR 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)
MEMORY
L C R
SLSSR
SB SBRSBL
SW
LFE
SP A
SP B
CAT
NEO:6 SAT D.RANGE
RDS ST
MONO
DTS-ES 96 / 24
HDMI COAX
D EX
;
OPT
;
PL II x;PL
dB
k Hz
mft.
MHz
LFE
SP B
NEO:6 D.RANGE MONOCOAX
k
m
MHz
RDS
x
MEMORY
C
SL SR
SB SBRSBL
SW
CAT
DTS
D
;;
PL
dB
Hz
ft.
ST
11
STR-K790
DCAC FACTORY TEST MODE
DCAC Factory Test mode have two stages:
1. DCAC DSP Data Line Checking
2. DCAC board Checking
Factory Test System Setup
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)
DSP Data Line
Check
Start Pass Pass
Auto Cal Mic
Check
END
SPK Front Left
DCAC MIC
Receiver
12
STR-K790
SECTION 3
ELECTRICAL ADJUSTMENT
[FM Auto Stop Check]
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.
The stop of automatic scanning means “The station signal is received
in good condition.”
TUNER SECTION
generator
OUT (75
Ω
)
SET
Ver. 1.1
1313
STR-K790
STR-K790
• Circuit Boards Location
SECTION 4
DIAGRAMS
For Schematic Diagrams.
Note:
• All capacitors are in µF unless otherwise noted. (p: pF)
50 WV or less are not indicated except for electrolytics and
tantalums.
• All resistors are in Ω and
1
/
4
W or less unless otherwise
specified.
• % : indicates tolerance.
• f : internal component.
• 2 : nonflammable resistor.
• 5 : fusible resistor.
• C : panel designation.
• 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 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
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.
• Indication of transistor.
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.
C
B
These are omitted.
E
Q
B
These are omitted.
CE
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each block.)
•Waveforms
– DIGITAL Board –
1
IC1905 9 (MCLK1)
1 V/DIV, 40 ns/DIV
72 ns
3.5 Vp-p
2
IC1101 id (X1)
1 V/DIV, 20 ns/DIV
41.6 ns
4.2 Vp-p
3
IC1301 ws (XIN)
1 V/DIV, 40 ns/DIV
81.4 ns
4.2 Vp-p
DIGITAL board
MAIN board
DISPLAY board
HEADPHONE board
POWER board
DCAC board
STANDBY board
HDMI BRIDGE board (AEP,UK)
HDMI SW board (AEP,UK)
Note:
The components identified by mark 0 or dotted line with mark 0 are
critical for safety.
Replace only with part
number specified.
Note:
Les composants identifiés
par une marque 0 sont critiques pour la sécurité.
Ne les remplacer que par une
piéce portant le numéro
spécifié.
1414
STR-K790
STR-K790
4-1. BLOCK DIAGRAM – MAIN SECTION –
• Signal Path
: FM
: ANALOG
: DIGITAL
: VIDEO
• R-CH is omitted due to same as L-CH.
AUDIO IN
AUDIO IN
AUDIO IN
PROCESSOR
INL3
6
49
LOUT
INL4
4
INL5
2
40
SLOUT
33
COUT
DATA
24
CLOCK
25
59
VOL IC_CL
SDA
SCL
60
VO ICL_DA
SYSTEM CONTROL
IC1101(1/2)
VIDEO 2/
BD IN
DVD
IN
J1301
35
62
IC1303
DIGITAL AUDIO
I/F RECEIVER
IC1301
L
DISPLAY
/POWER
SECTION
DIN2
5
DOUT
35
DI
36
CLK
38
CE
37
ERROR
34
XSTATE
17
XMODE
48
13
CK OUT
20
XMCK
14
BCK
15
LRCK
16
DATAO
IC1303
X1301
12.288MHz
AUDIO DSP
IC1905
KFSI0
SYSCLK
LRCK
BCK
DOUT
22
15
10
11
12
SDI2
30
HCLK
34
HCS
36
HACN
32
PM
113
XRST
2
23
SDO1
24
SDO2
25
SDO3
BCKI2
29
LRCKI2
28
LRCKI1
15
BCKI1
17
IC1502
SRAM
AUDIO CODEC
IC1452
AD CONVERTER
IC1401
SCKI
38
RST
37
ML
36
MC
35
MDI
34
MDO
33
10
VOUT5
BCK
40
LRCK
41
DATA3
47
DATA1
45
DATA2
46
14
VOUT1
12
VOUT3
11
VOUT4
ANALOG SOUND
27
AVCC
26
DVDD
SL
ADIFL
13
LIN
16
19
20
21
SL
C
32
SWOUT
SW
SLIN
CIN
SWIN
A
98 97 95 96 99 100 94 1
DO
DI
CLK
CE
ERROR
XSTATE
CKSEL1
DATA0
3
BST
20
HCLK
4
HCS
5
HACN
7
PM
92
BST_SEL
6
XRST
10
PCM1609/1803_RST
12
PCM1609_ML
13
PCM1609_MC
14
PCM1609_MDI
15
PCM1609_MDO
5 6
29 30
J400
INL2
8
SA-CD/CD
SAT
TV
OPTICAL
IN
IC1351
DIN0
3
22 21
XIN XOUT
12 9
93
XMODE
CKSEL1
47
GP9
68
HDOUT
35
HDIN
33
2
GP9
18
HD OUT
19
HD IN
8
GP12
GP12
37
MCLK1
MCLK2
X1502
13.9MHz
14
SCKOUT
1
LIN
7
PDWN
20
BCKO
19LRCKO
18 SDI1
24AUDIO
GP8
69
EXLOCK
59
INL1
10
TUNER PACK
FM
75Ω
COAXIAL
AM
R-CH
DI
DO/SD/ST
CLK
CE
FM
AM
R CH
L CH
TUNER +10V10V
DO/SD/ST
73
SLATCH
74
TUNER_DATA
47
TUNER_CLK
46
OPTICAL
DIGITAL
COAXIAL
D1301
IC400
SDA SCL
EEPROM
IC1131
IC502
WOOFER AMP
3 7
IC1503
SELECTOR
1
6
556
2
A
B
BSTSY
ANTENNA
(Page 15)
B
DISPLAY
/POWER
SECTION
(Page 15)
57
ADCC_INT
D1501-1503
+3.3V
REG
+7V
Q471
VIDEO 1 IN/
PORTABLE AUDIO IN/
AUTO CAL MIC
J2000
R-CH
AUTO CAL MIC
86
HDMI_S187HDMI_OED
CN5001
CN5002
CN5003
DVD IN
HDMI
HDMI
VIDEO 2 / BD IN
OUT
OEB
42
2,3,5,
6,8,9,
11,12,
14,15,
80
62-64,
67,68,
70,71,
73,74,
76,77
25,26,
28,29,
31,32,
34,35,
38-40
S1
21
IC5004
INPUT
DET
1
5
7
3
IC5005
INPUT
SELECT
88
HDMI_PRE
3
1
4
6
IC5002
+5V REG
IC5001
HDMI
SELECT
45
HDMI
+5.8V
1
AEP,UK
AEP,UK
RDS DATA
RDS INT
SD
RDS DATA
RDS CLK
5352
TUNER SD
43
1515
STR-K790
STR-K790
4-2. BLOCK DIAGRAM – DISPLAY/POWER SECTION –
• R-CH is omitted due to same as L-CH.
• Signal Path
: FM
IN2
8
12
+V OUT2
POWER AMP
IC501
POWER AMP
IC601
9
NF2
LIMITER
Q501,502
11
-V OUT2
IN2
12
+V OUT2
9
NF2
11
-V OUT2
BOOSTER
Q503
BOOSTER
Q504
CURRENT
DETECT
Q505,506
AF POWER
PROTECT
Q507
LIMITER
Q601,602
BOOSTER
Q603
BOOSTER
Q604
CURRENT
DETECT
Q605,606
IN2
8
12
+V OUT2
POWER AMP
IC701
9
NF2
LIMITER
Q701,702
11-V OUT2
BOOSTER
Q703
BOOSTER
Q704
CURRENT
DETECT
Q705,706
2
+V OUT1
5
NF1
LIMITER
Q751,752
3-V OUT1
BOOSTER
Q753
BOOSTER
Q754
CURRENT
DETECT
Q755,756
D1001
PROTECT
SWITCH
Q881-883
RELAY
DRIVE
Q509
RY502
RELAY
DRIVE
Q608
RY551
D1111
RY601
D1110
RELAY
DRIVE
Q708
RY701
D1107
L
R
R
L
R-CH
R-CH
SR-CH
R-CH
R-CH
SR-CH
SR-CH
R-CH
R-CH
PHONES
TM602(1/2)
61
PROTECTOR
62
HP_RY
66
FRONT_A_RY/DG51_FB
69
C/REAR/SB_RY
RV102
ENCODER
3 2
VOL_ENCODER(B)64VOL_ENCODER(A)
65
POWER_KEY
56
?/1
S152
77
RSTX
48
STOP
54
SIRCS
63FUSE DETECT
REMOTE
CONTROL
RECEIVER
1
IC102
D910-913
AC
IN
T900(AEP,UK)
T902(US,CND)
RY901
D915
F901
D914
RELAY
DRIVE
Q901
D920-923
23
VCC5
84
VCC3
-7V
REG
3 2
+7V
REG
1 3
AUDIO
+7V
IC821
IC822
POWER_RY
58
RELAY
+B
D804-807
82
83
X0
X1
X1101
24MHz
F1
F2
L
SLSL
C
A
IN1
6
SW
J790
FLUORESCENT
INDICATOR TUBE
FL101
9
FL_LAT
7
DIN
8
CLK
9
STB
16
FL_CLK17FL_DATA
14
29
31
SEG1-17
42
32
GRID1-11
F1
F2
FL DRIVE
IC100
ADCC
38
DC-CONTROL
68
S114-119
FUNCTION
KEY
A/D1
39
FUNCTION
KEY
A/D2
40
S103,104
SYSTEM CONTROL
IC1101(2/2)
AF POWER
PROTECT
Q607
AF POWER
PROTECT
Q707
FRONT
SURROUND
55
HP_DETECT
BUFFER
IC101
35
AVCC
36
AVRH
+3.3V
REG
3 1
IC1904
AUDIO
-7V
+10V
REG
3 1
TUNER
+10V
IC1902
T901
Q911
AC DET
1 2
IC1111
D811
R803
+B
-B
-B
SWITCH
Q851,852
-20V REG
Q801
FL101
-20V
POWER AMP
-B
+5V
REG
3 1
IC1031
PROTECT
DET
2 7
IC850
+5V
+2.5V
REG
5
+2.5V
+3.3V
REG
2
4
IC1901
+3.3V
+5V
REG
3 1
IC1001
AUDIO
+5V
SPEAKERS
IMPEDANCE USE 6-16Ω
MASTER
VOLUME
RV101
ENCODER
3 2
ENC_B32ENC_A
31
INPUT
SELECTOR
8
RESET
5 1
IC2000
AMP
+3.3V
(STBY)
MAIN
SECTION
CENTER
SUB
WOOFER
(Page 14)
B
MAIN
SECTION
(Page 15)
AUTO CAL MIC
+7V
TM604(1/2)
TM602(2/2)
TM604(2/2)
DC
CONTROL
Q2001,2002
VACS
CONTROL
D841
R-CH
45
VAX CTRL
+5.8V
REG
412
IC5006
HDMI
+5.8V
+3.3V
REG
3 1
IC5003
HDMI
+3.3V
89
HDMI_CTRL
AEP,UK
1616
STR-K790
STR-K790
4-3. PRINTED WIRING BOARD – DIGITAL BOARD (SIDE A) –
:Uses unleaded solder.
• See page 13 for Circuit Boards Location.
IC1905
IC1301
IC1502
IC1452
IC1401
IC1131
IC1101
IC1111
IC1503
IC1303
1-872-321-
11
(11)
C1118
C1119
C1502
C1315
C1509
C1122
C1123
C1129
C1511
R1106
R1107
R1108
C1131
C1132
R1301
C1137
R1303
R1110
R1304
C1521
R1111
R1305
C1522
R1112
R1306
R1307
R1308
R1309
R1117
R1118
R1501
C1142
R1502
R1310
R1504
R1311
R1505
R1312
R1506
R1313
R1120
R1508
R1121
R1509
R1122
R1123
R1124
R1318
R1125
R1319
R1126
R1127
1
54
3
R1128
R1510
R1129
R1511
R1512
R1513
R1514
R1321
R1096
R1515
R1325
R1134
R1135
R1523
R1524
R1140
R1143
R1144
C1362
R1150
R1151
R1152
R1153
R1154
R1156
R1947
R1948
C1567
R1157
C1568
C1569
R1541
FB1452
FB1453
R1160
R1161
R1356
R1357
R1164
R1359
R1360
R1555
R1556
R1557
R1175
R1179
R1180
R1181
R1182
R1185
R1188
R1570
R1189
R1571
R1572
R1573
R1574
R1191
R1192
R1194
JR1511
RB1500
RB1501
RB1502
RB1503
RB1504
RB1506
RB1507
RB1508
X1101
X1301
C1405
C1408
D1001
X1502
C1604
C1605
C1414
C1415
R1201
R1010
R1011
FB1305
R1012
FB1306
R1013
R1014
FB1308
R1015
US,CND
US,CND
AEP,UK
AEP,UK
R1400
R1401
FB1503
R1403
FB1310
R1404
C1620
R1405
R1406
R1407
C1434
R1410
R1411
R1035
R1425
R1426
C1067
R1041
R1042
R1049
R1435
R1436
R1058
R1059
R1635
R1636
FB1350
R1445
R1446
R1253
R1061
R1062
R1065
R1066
R1067
R1068
R1072
R1073
R1076
C1487
R1077
R1460
R1461
R1464
R1466
R1469
JR1005
R1083
R1084
JR1008
R1088
R1470
R1471
R1472
R1475
R1476
R1094
R1095
R1484
JR1020
R1486
R1491
R1492
R1493R1408
R1494
R1495
W1001
C1102
C1107
C1301
C1302
C1303
C1304
C1409
C1401
C1404
C1002
R1943
C1361
R1351
JL002
JL005
JL008
FB1403
FB1405
C1068
D1301
D1302
D1109
JL007
C1913
C1031
R1946
JL014
JL009
JL010
JL011
DIGITAL BOARD
(SIDE A)
15
DIGITAL
BOARD
(SIDE B)
(Page 17)
12
A
B
C
D
E
345678
• Semiconductor
Location
Ref. No.
Location
D1001 B-6
D1109 C-7
D1301 C-3
D1302 C-2
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
1717
STR-K790
STR-K790
4-4. PRINTED WIRING BOARD – DIGITAL BOARD (SIDE B) –
:Uses unleaded solder.
• See page 13 for Circuit Boards Location.
• Semiconductor
Location
Ref. No.
Location
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
IC1001
IC1351
IC1902
IC1904
IC1901
IC1031
1-872-321-
11
(11)
C1501
C1503
C1310
C1504
C1505
C1312
C1506
C1313
C1507
C1314
C1508
C1121
C1124
C1510
C1513
C1514
R1105
C1516
C1518
C1519
C1905
R1302
C1138
C1520
C1139
D1501
D1502
D1503
C1140
R1503
C1144
C1145
R1314
C1149
R1323
C1351
C1547
C1358
R1530
C1171
C1172
R1159
R1355
R1186
R1190
R1193
C1004
C1005
D1003
D1004
FB1101
FB1302
FB1501
FB1502
R1039
C1450
C1454
R1260
R1261
C1299
C1494
C1495
R1474
C1100
C1108
C1305
C1308
C1309
C1566
R1352
CL043
CL042
CL018
CL020
CL019
CL016
CL017
CL027
CL026
CL021
CL024
CL025
CL030
CL035
CL029
CL028
CL031
CL033
CL032
CL034
CL036CL037
CL041
CL040
JL001
R1078
R1187
C1019
CL004
CL012
CL001
CL013
CL011
CL009
CL005
CL007
CL002
CL003
R1409
R1184
R1183
D1107
D1108
D1110
D1111
JL013
CL045
CL022
C1255
C1254
C1253
C1120
C1021
JR1002
JR1010
JR1009
C1515
C1517
C1906
C1908
C1525
C1355
C1359
C1001
J1301
C1402
C1403
C1406
C1407
CNS501
C1418
C1428
C1438
C1455
C1457
C1458
C1468
C1488
C1491
W1000
W1001
C1103
C1306
CNS507
CNS513
CNP506
CNS509
CNS502
HS1901
CNS508
JL002
JL005
JL008
CNP505
TP1000
CNS504
C1032
C1022
HS1903
JL014
JL009
JL010
JL011
C1914
DIGITAL BOARD
(SIDE B)
AEP,UK
AEP,UK
TUNER
US,CND
A
C
HDMI BRIDGE
BOARD
CNS199
(Page 23)
STANDBY BOARD
CNP801
(Page 26)
D
MAIN
BOARD
CNP504
(Page 25)
H
DISPLAY
BOARD
CNS102
(Page 31)
AEP,UK
75
COAXIAL
FM
AM
for
FLASH
PROGRAMMING
G
MAIN
BOARD
CNP502
(Page 25)
F
MAIN
BOARD
CNP501
(Page 25)
DVD IN
COAXIAL
DIGITAL
OPTICAL
VIDEO 2/
BD IN
15
DIGITAL
BOARD
(SIDE A)
(Page 16)
12
A
B
C
D
F
E
345678
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