Sony STRK-685 Service manual
STR-K685
SERVICE MANUAL
Ver. 1.2 2007.07
• STR-K685 is the tuner and the amplifier
section in HT-DDW685.
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
E Model
Amplifier section
Models of area code SP, SP6, E51, MX, TH
Power Output
Stereo mode (rated) (6 ohms 1 kHz, THD 1%)
Surround mode
(6 ohms 1 kHz, THD 10%)
Surround mode
(10 ohms 100 Hz, THD 10%)
Models of area code AR
Power Output
Stereo mode (rated) (6 ohms 1 kHz, THD 1%)
1)
70 W + 70 W
2)
(reference)
RMS output
FRONT:100 W
per channel
CENTER: 100 W
SURROUND: 100 W
per channel
2)
(reference)
SUB WOOFER: 60 W
per channel
1)3)
70 W + 70 W
65 W + 65 W
1)
3)
Surround mode2) (reference)
(6 ohms 1 kHz, THD 10%)
RMS output
FRONT:
100 W per channel
90 W per channel
CENTER:
1)
100 W
3)
90 W
SURROUND:
100 W per channel
90 W per channel
Surround mode2) (reference)
(10 ohms 100 Hz, THD 10%)
SUB WOOFER:
60 W per channel
50 W per channel
1)
Measured under the following conditions:
Area code Power requirements
SP, SP6, AR, TH 230 V AC, 50 Hz
E51 240 V AC, 50 Hz
MX
127 V AC, 60 Hz
1)
3)
1)
3)
1)
3)
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.
3)
Measured under the following conditions:
Area code Power requirements
AR 220 V AC, 50 Hz
Inputs
Analog Sensitivity: 800 mV/
Digital (Coaxial) Impedance: 75 ohms
Tone
Gain levels ±6 dB, 1 dB step
Reproduction frequency range:
FM tuner section
Tuning range 87.5 - 108.0 MHz
Antenna FM wire antenna
Antenna terminals 75 ohms, unbalanced
Intermediate frequency
50 kohms
28 – 20,000 Hz
10.7 MHz
— Continued on next page —
9-887-654-03
2007G16-1
© 2007.07
FM STEREO/FM-AM RECEIVER
Sony Corporation
Home Audio Division
Published by Sony Techno Create Corporation
STR-K685
Parts No.
Ver. 1.2
AM tuner section
Tuning range
Models of area code SP, SP6, TH
With 9-kHz tuning scale:
531 – 1,602 kHz
Models of area code E51:
With 10-kHz tuning scale:
530 – 1,610 kHz
With 9-kHz tuning scale:
531 – 1,602 kHz
4)
4)
Models of area code AR, MX
With 10-kHz tuning scale:
530 – 1,610 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 MOVIE, 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
SP, SP6, TH 230 – 240 V AC, 50/60 Hz
E51 120/220/240 V AC,
AR 220 – 230 V AC, 50/60 Hz
MX 127 V AC, 60 Hz
50/60 Hz
Power consumption
Area code Power consumption
SP, SP6, E51, AR,
MX, TH
190 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.
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 W ARNING!!
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 P ARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
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).
LR
LR
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”.
• Abbreviation
AR : Argentine model
E51 : Chilean and Peruvian models
MX : Mexican model
SP : Singapore model
SP6 : Singapore and Malaysia models
TH : Thai model
2
MODEL IDENTIFICATION
– Rear Panel –
Model Part No.
SP and SP6 models 2-896-343-0[]
E51 model 2-896-343-1[]
MX model 2-896-343-2[]
AR model 2-896-343-3[]
TH model 2-896-343-7[]
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 Board – MAIN Board – ......................... 23
4-11. Printed Wiring Board – STANDBY Board,
AC SELECT Board (E51 only) – .................................... 24
4-12. Schematic Diagram – MAIN Board (1/4) – ................... 25
4-13. Schematic Diagram – MAIN Board (2/4),
STANDBY Board, AC SELECT Board (E51 only) – ..... 26
4-14. Schematic Diagram – MAIN Board (3/4) – ................... 27
4-15. Schematic Diagram – MAIN Board (4/4) – ................... 28
4-16. Printed Wiring Board – DISPLAY Board – ................... 29
4-17. Schematic Diagram – DISPLAY Board – ...................... 30
4-18. Printed Wiring Boards – POWER Board, DCAC Board,
HEADPHONE Board –................................................... 31
4-19. Schematic Diagram – POWER Board, DCAC Board,
HEADPHONE Board –................................................... 32
STR-K685
5. EXPLODED VIEWS
5-1. Front Panel Section ......................................................... 39
5-2. Chassis Section................................................................ 40
6. ELECTRICAL PARTS LIST .................................. 41
3
STR-K685
Receiver
Front panel
SECTION 1
GENERAL
qf
1
?/1
VIDEO 1 IN/
PORTABLE AUDIO IN/
AUTO CAL MIC
PHONES
2 3 4
DIMMER SLEEP 2CH
A.F.D. MOVIE MUSIC
qs
qaqd
Name Function
A ?/1
(on/standby)
B DIMMER Pr ess 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
q;
9
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..
4
About the indicators on the display
1 2 3 4 5 6 87
STR-K685
LFE
SW
LCR
SL S SR
;
D
;
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
SW
LCR
SL SR
5
STR-K685
Rear panel
1 2
DIGITAL
OPTICAL
VIDEO 2/
BD IN
COAXIAL
DVD
IN
ANTENNA
L
R
AUDIO INTVAUDIO IN
SA-CD/CD
AM
AUDIO IN
SAT
A DIGITAL INPUT section
OPTICAL
IN jack
COAXIAL IN
jack
Connects to a DVD
player, etc. The
COAXIAL jack
provides a better
quality of loud
sound (page 19).
43
SPEAKERS SPEAKERS
LR
SUB
WOOFER
LR
SURROUND
C AUDIO INPUT section
White (L)
Red (R)
D SPEAKER section
LR
LR
FRONTCENTER
AUDIO IN
jacks
Connects to a CD
player, etc. (page
17).
B ANTENNA section
FM
ANTENNA
jack
AM
ANTENNA
terminals
Connects to the
FM wire antenna
supplied with this
receiver (page 21).
Connects to the
AM loop antenna
supplied with this
receiver (page 21).
Connects to the
speakers and sub
woofer* (page 15).
*The numbers of the SUB WOOFER terminals
varies depending on the models.
6
STR-K685
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
1
2
3
4
5
6
7
8
9
q;
qa
qs
qd
qf
wd
ws
wa
w;
ql
qk
qj
qh
qg
TV INPUT
AUTO
TV
?/1
AV
SLEEP
VIDEO 1 VIDEO 2 VIDEO 3 DVD
SAT TV SA-CD/CD TUNER
2CH A.F.D.
123
46
78
>10/
-
CLEAR
Gg
RETURN/EXIT
TV CH –
PRESET –
.
TUNING –
TV
?/1
CAL
SYSTEM STANDBY
MOVIE MUSIC
AMP MENU
5
0/10
F
f
REPLAY ADVANCE
<
FM MODE
D.TUNING
9
D.SKIP
MEMORY DVD MENU
ENTER
MUTING
TOOLSDISPLAY
TV VOL
MASTER VOL
MENU
TV CH +
PRESET +
<
TUNING +
HmM
Xx
?/1
>
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
7
STR-K685
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.
8
STR-K685
Name Function
Q RETURN/
EXIT O
R
V/v/B/b
S DISPLAY Press to select the information
T -/-- Press -/-- and TV (O) at the
x
>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 Pre ss TV INPUT and TV (O)
SLEEP Press to activate the Sleep
*The number 5, MASTER V OL +, TV VOL +, 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.
9
STR-K685
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. (3 second)
SOFTWARE VERSION DISPLAY MODE
The software version is displayed.
Procedure:
1. While depressing the DIMMER and the A UTO CAL b uttons
simultaneously, press the power ?/1 button to turn on the
main power.
2. The model name, destination and the software version are
displayed. (8 second)
KEY CHECK MODE
Button check
Procedure:
1. While depressing the 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.
SP A
LFE
SW
L C R
SLSSR
SB SBRSBL
SP B
;
;
D EX
PL II x;PL
OPT
HDMI COAX
DTS-ES 96 / 24
3. Turn the INPUT SELECTOR dial.
LFE
SP B
x
CAT
NEO:6 SAT D.RANGE
NEO:6 D.RANGE MONOCOAX
MEMORY
dB
k Hz
mft.
MHz
k
m
MHz
RDS ST
MONO
RDS
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
If an error occurs, the “Protector Display” will flash for a while and
the power is turned 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 (3 seconds) and the display returns
to the “Protector Display” and the power remains ON.
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
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)
4. Turn the INPUT SELECTOR dial once again.
SW
C
SL SR
SB SBRSBL
;;
D
DTS
PL
CAT
MEMORY
dB
Hz
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.
10
ST
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-K685
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)
11
STR-K685
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.”
12
SECTION 4
DIAGRAMS
STR-K685
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 for 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 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
• Abbreviation
AR : Argentine model
E51 : Chilean and Peruvian models
MX : Mexican model
SP : Singapore model
SP6 : Singapore and Malaysia models
TH : Thai model
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
DCAC board
HEADPHONE board
•Waveforms
– DIGITAL Board –
1
IC1905 9 (MCLK1)
STANDBY board
POWER board
DISPLAY board
AC SELECT board (E51)
DIGITAL board
MAIN board
STR-K685
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)
81.4 ns
1 V/DIV, 40 ns/DIV
1313
3.5 Vp-p
4.2 Vp-p
4.2 Vp-p
STR-K685
4-1. BLOCK DIAGRAM – MAIN SECTION –
DISPLAY
/POWER
SECTION
(Page 15)
DIGITAL
ANTENNA
B
VIDEO 1 IN/
PORTABLE AUDIO IN/
AUTO CAL MIC
SAT
TV
SA-CD/CD
COAXIAL
VIDEO 2/
OPTICAL
AUDIO IN
AUDIO IN
AUDIO IN
DVD
IN
BD IN
FM
75Ω
COAXIAL
AUTO CAL MIC
AM
J2000
J400
J1301
IC1351
OPTICAL
IC400
ANALOG SOUND
PROCESSOR
R-CH
15
12
11
10
D1501-1503
57
ADCC_INT
IC1401
AD CONVERTER
SYSCLK
DOUT
BCK
LRCK
PDWN
7
10
PCM1609/1803_RST
LIN
12
13
PCM1609_ML
PCM1609_MC
1
14
15
PCM1609_MDI
PCM1609_MDO
38
SCKI
40
BCK
41
LRCK
47
DATA3
45
DATA1
46
DATA2
37
RST
36
ML
35
MC
34
MDI
33
MDO
IC1452
AUDIO CODEC
VOUT5
VOUT1
VOUT3
VOUT4
10
14
12
11
IC1301
DIGITAL AUDIO
I/F RECEIVER
XMCK
CK OUT
BCK
LRCK
DATAO
X1301
IC1101(1/2)
SYSTEM CONTROL
20
IC1905
AUDIO DSP
17
BCKI1
SCKOUT
X1502
13.9MHz
BCKO
SDO1
SDO2
SDO3
MCLK1
14
20
19LRCKO
23
24
25
IC1502
SRAM
IC1503
SELECTOR
2
BST
B
Y
556
A
1
S
6
3
92
BST
BST_SEL
15
LRCKI1
18 SDI1
22
13
14
15
16
24AUDIO
D1301
20
4
5
DATA0
2
18
19
8
GP9
GP12
HD OUT
HD IN
HCLK
HCS
7
HACN
KFSI0
29
BCKI2
28
LRCKI2
30
SDI2
69
GP8
68
GP9
37
GP12
35
HDOUT
33
HDIN
34
HCLK
36
HCS
32
HACN
PM
113
2
XRST
59
EXLOCK
MCLK2
12 9
6
PM
XRST
IC1303
IC1303
35
62
IN
TUNER PACK
L CH
FM
R CH
DO/SD/ST
AM
R-CH
TUNER +10V10V
DI
CLK
CE
73
74
47
46
SLATCH
TUNER_CLK
98 97 95 96 99 100 94 1
DI
CE
DO
CLK
DO/SD/ST
TUNER_DATA
ERROR
93
XSTATE
XMODE
35
36
38
37
34
17
48
47
CKSEL1
5
3
DIN2
DIN0
DOUT
DI
CLK
CE
ERROR
XSTATE
XMODE
CKSEL1
XIN XOUT
22 21
12.288MHz
59
60
VO ICL_DA
10
13
16
19
20
21
24
25
VOL IC_CL
2
INL5
4
INL4
6
INL3
8
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
27
Q471
+3.3V
26
REG
49
40
33
32
+7V
IC502
WOOFER AMP
3 7
L
SL
SL
C
SW
A
DISPLAY
/POWER
SECTION
(Page 15)
STR-K685
• R-CH is omitted due to same as L-CH.
• Signal Path
: FM
: ANALOG
: DIGITAL
1414
4-2. BLOCK DIAGRAM – DISPLAY/POWER SECTION –
STR-K685
• R-CH is omitted due to same as L-CH.
• Signal Path
: FM
L
SLSL
MAIN
MAIN
A
C
SW
AUTO CAL MIC
B
X1101
24MHz
IC102
REMOTE
1
CONTROL
RECEIVER
SECTION
(Page 14)
SECTION
(Page 15)
8
8
8
6
X0
82
X1
83
54
IC501
POWER AMP
+V OUT2
NF2
IN2
-V OUT2
IC601
POWER AMP
+V OUT2
NF2
IN2
-V OUT2
POWER AMP
IC701
+V OUT2
IN2
+V OUT1
IN1
IC2000
AMP
5 1
Q2001,2002
DC
CONTROL
68
DC-CONTROL
SIRCS
FL_LAT
9
12
9
11
12
9
11
12
NF2
9
11-V OUT2
2
NF1
5
3-V OUT1
FL_CLK17FL_DATA
16
+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
38
ADCC
IC100
FL DRIVE
SEG1-17
DIN
7
CLK
8
STB
9
GRID1-11
Q505,506
CURRENT
DETECT
Q605,606
CURRENT
DETECT
Q705,706
CURRENT
DETECT
Q755,756
CURRENT
DETECT
14
29
31
42
32
FLUORESCENT
INDICATOR TUBE
Q881-883
PROTECT
SWITCH
61
PROTECTOR
FL101
R-CH
SR-CH
R-CH
SR-CH
SYSTEM CONTROL
IC1101(2/2)
F1
F2
D841
VACS
CONTROL
45
VAX CTRL
AF POWER
PROTECT
AF POWER
PROTECT
Q507
Q607
Q707
R-CH
D1111
D1110
D1107
SR-CH
62
66
69
HP_RY
C/REAR/SB_RY
FRONT_A_RY/DG51_FB
A/D1
39
FUNCTION
KEY
S114-119
Q608
RELAY
DRIVE
Q708
RELAY
DRIVE
Q509
RELAY
DRIVE
RY551
RY601
RY701
RY502
A/D2
40
FUNCTION
KEY
S103,104
R-CH
R-CH
R-CH
55
HP_DETECT
VOL_ENCODER(B)
VOL_ENCODER(A)
64
65
3 2
ENCODER
RV102
MASTER
VOLUME
TM602(1/2)
L
R
TM605(1/2)
L
R
TM602(2/2)
TM605(2/2)
ENC_B32ENC_A
3 2
ENCODER
RV101
INPUT
SELECTOR
31
FRONT
(IMPEDANCE USE 6-16Ω)
SURROUND
(IMPEDANCE USE 6-16Ω)
CENTER
(IMPEDANCE USE 6-16Ω)
SUB
WOOFER
(IMPEDANCE USE 10-16Ω)
J790
PHONES
POWER_KEY
56
SPEAKERS
SPEAKERS
SPEAKERS
SPEAKERS
AVRH
AVCC
VCC3
VCC5
RSTX
STOP
POWER_RY
S152
?/1
IC850
PROTECT
2 7
DET
POWER AMP
-B
+B
-B
FL101
-20V
TUNER
+10V
RELAY
+B
AUDIO
+7V
AUDIO
+5V
AUDIO
-7V
+5V
IC1111
RESET
1 2
+3.3V
+2.5V
+3.3V
(STBY)
63FUSE DETECT
36
35
84
23
77
48
58
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
IC1031
+5V
3 1
REG
IC1901
+3.3V
2
REG
+2.5V
5
REG
IC1904
+3.3V
3 1
REG
Q911
AC DET
4
D1001
D811
D920-923
D804-807
D910-913
Q901
RELAY
DRIVE
R803
T901
EXCEPT E51
E51
S901
VOLTAGE
SELECT
F901
F1
F2
T902
AC
IN
D915D914
RY901
STR-K685
1515
STR-K685
4-3. PRINTED WIRING BOARD – DIGITAL BOARD (SIDE A) –
12
A
B
C
D
E
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
R1303
C1304
C1303
R1359
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
R1455
R1066
R1120
C1913
R1062
R1061
R1068
R1135
R1041
R1011
R1067
R1065
R1015
R1014
R1042
R1095
R1012
R1076
R1151
R1153
R1013
R1010
R1140
R1947
R1094
R1121
R1152
R1154
R1948
D1001
C1102
IC1101
R1157
R1156
C1142
R1188
IC1131
R1185
R1084
R1125
C1118
R1194
C1031
X1101
C1620
R1635
C1119
R1164
R1201
IC1111
54
C1137
R1524
R1127
C1604
JL002
C1605
R1636
1
R1189
JL005
R1122
R1123
R1129
R1083
R1124
R1126
3
C1107
R1108
R1128
C1129
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
15
DIGITAL
BOARD
(SIDE B)
(Page 17)
12
(12)
R1321
R1319
R1556
R1307
D1301
R1502
R1313
R1325
R1310
R1308
R1309
FB1305
X1502
C1522
FB1503
IC1452
R1460
R1492
R1403
R1484
C1487
C1521
R1461
R1312
R1505
R1515
R1504
R1311
R1513
R1506
X1301
R1523
R1486
R1501
C1509
C1511
R1512
R1491
R1404
IC1502
RB1501
R1514
R1508
RB1506
R1446
RB1502
IC1905
R1472
R1471
R1470
R1405
R1445
R1253
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-K685
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
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