HT-DDW995, STR-K995 — Sony Audio Service Manual (repair manual)

Model
HT-DDW995 STR-K995
Pages
74
Size
4.42 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
ht-ddw995-str-k995.pdf
Date

View Sony HT-DDW995 / STR-K995 Service Manual online

SERVICE MANUAL
Sony Corporation
Home Audio Division
Published by Sony Techno Create Corporation
US Model
MULTI CHANNEL AV RECEIVER
9-887-679-01
2007E16-1
© 2007.05
Ver. 1.0  2007.05
SPECIFICATIONS
STR-K995
• STR-K995 is the tuner and the amplifier section
in HT-DDW995.
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 TOTAL 
HARMONIC DISTORTION:
With 6 ohm loads, both channels driven, from 
120 – 20,000 Hz; rated 90 watts per channel 
minimum RMS power, with no more than 1% 
total harmonic distortion from 250 milliwatts 
to rated output.
Amplifier section
Power Output
1)
Models of area code US
Stereo mode (rated) (6 ohms 1 kHz
, THD 1%)
 
90 W + 90 W
Surround mode (reference) (6 ohms 1 kHz
 
THD 10%)
RMS output
2)
FRONT: 140 W
 
per channel
CENTER: 140 W
SURROUND: 140 W
 
per channel
1)
Measured under the following conditions:
2)
Reference power output for front, center and 
surround speakers. 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
Outputs (Analog)
AUDIO OUT
Voltage: 800 mV/
 
10 kohms
SUBWOOFER
Voltage: 2 V/1 kohm
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
With 10-kHz tuning scale:
530 – 1,710 kHz
3)
With 9-kHz tuning scale: 
531 – 1,710 kHz
3)
Antenna
Loop antenna
Intermediate frequency
 
450 kHz
3)
You can change the AM tuning scale to 9 kHz or 
10 kHz. After tuning in any AM station, turn off 
the receiver. While holding down TUNING 
MODE, press ?/1. All preset stations will be 
erased when you change the tuning scale. To reset 
the scale to 10 kHz (or 9 kHz), repeat the 
procedure.
Area code
Power requirements
US
120 V AC, 60 Hz
2
STR-K995
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.
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 AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC voltmeter. The “limit” indication
is 0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples
of a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2 V AC range are suitable.  (See
Fig. A)
Fig. A.
Using an AC voltmeter to check AC leakage.
1.5 k
0.15 
µ
F
AC
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
Video section
Inputs/Outputs
Video:
1 Vp-p, 75 ohms
COMPONENT VIDEO:
Y: 1 Vp-p, 75 ohms
P
B
/C
B
: 0.7 Vp-p, 
 
75 ohms
P
R
/C
R
: 0.7 Vp-p, 
 
75 ohms
80 MHz HD Pass Through
General
Power requirements
Power output (DIGITAL MEDIA PORT)
DC OUT:
5 V, 700 mA
Power consumption
Power consumption (during standby mode)
0.3 W
Area code
Power requirements
US
120 V AC, 60 Hz
Area code
Power consumption
US
200 W
Dimensions (width/height/depth) (Approx.)
430 
× 157.5 × 310 mm 
(17 
× 6 1/4 × 12 1/4 inches) 
including projecting parts 
and controls
Mass (Approx.)
7.8 kg (17 lb 4 oz)
Design and specifications are subject to 
change without notice.
3
STR-K995
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 lead-
free 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.
TABLE OF CONTENTS
1.
GENERAL
...................................................................
4
2.
TEST MODE
............................................................... 11
3.
ELECTRICAL ADJUSTMENT
............................. 13
4.
DIAGRAMS
................................................................. 14
4-1.
Block Diagram – MAIN Section – .................................. 15
4-2.
Block Diagram – DISPLAY/POWER Section – ............. 16
4-3.
Block Diagram – HDMI Section – .................................. 17
4-4.
Printed Wiring Board  – DIGITAL Board (Side A) – ...... 18
4-5.
Printed Wiring Board  – DIGITAL Board (Side B) – ...... 19
4-6.
Schematic Diagram  – DIGITAL Board (1/5) – .............. 20
4-7.
Schematic Diagram  – DIGITAL Board (2/5) – .............. 21
4-8.
Schematic Diagram  – DIGITAL Board (3/5) – .............. 22
4-9.
Schematic Diagram  – DIGITAL Board (4/5) – .............. 23
4-10. Schematic Diagram  – DIGITAL Board (5/5) – .............. 24
4-11. Printed Wiring Board  – MAIN Board – ......................... 25
4-12. Schematic Diagram  – MAIN Board (1/4) – ................... 26
4-13. Schematic Diagram  – MAIN Board (2/4) – ................... 27
4-14. Schematic Diagram  – MAIN Board (3/4) – ................... 28
4-15. Schematic Diagram  – MAIN Board (4/4) – ................... 29
4-16. Printed Wiring Boards
– DISPLAY Board, POWER KEY Board – .................... 30
4-17. Schematic Diagram
– DISPLAY Board, POWER KEY Board – .................... 31
4-18. Printed Wiring Boards
– STANDBY Board, DCDC Board – .............................. 32
4-19. Schematic Diagram
– STANDBY Board, DCDC Board – .............................. 33
4-20. Printed Wiring Boards
– DCAC Board, VIDEO3 Board – .................................. 34
4-21. Schematic Diagram
– DCAC Board, VIDEO3 Board – .................................. 35
4-22. Printed Wiring Boards
– VIDEO Board, HEADPHONE Board – ....................... 36
4-23. Schematic Diagram
– VIDEO Board, HEADPHONE Board – ....................... 37
4-24. Printed Wiring Board  – HDMI RE Board – ................... 38
4-25. Schematic Diagram  – HDMI RE Board (1/2) – ............. 39
4-26. Schematic Diagram  – HDMI RE Board (2/2) – ............. 40
5.
EXPLODED VIEWS
5-1.
Front Panel Section ......................................................... 56
5-2.
Chassis Section ................................................................ 57
6.
ELECTRICAL PARTS LIST
.................................. 58
About area codes
Th
Moreover, it is possible to distinguish the model
by Part No..
e 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”.
ERS
ONT A
R
SURROUND
L
L
R
CENTER
Area code
Part No.
BACK PANEL
Model
Part No.
US Model
2-897-800-9
4
STR-K995
SECTION 1
GENERAL
This section is extracted
from instruction manual.
Front panel
Receiver
?/1
AUTO CAL MIC
SPEAKERS
(OFF/A/B/A+B)
PHONES
VIDEO 3 IN/PORTABLE AV IN
VIDEO
L  AUDIO   R
MEMORY/
ENTER
TUNING 
MODE
TUNING
2CH
A.F.D.
MOVIE
MUSIC
AUTO CAL
MUTING
DISPLAY
INPUT MODE
INPUT SELECTOR
MASTER VOLUME
MULTI CHANNEL DECODING
3
5
9
q;
qa
qk
qd
qf
qg
qh
qj
1
2
8
6
7
4
qs
Name
Function
A
 
?
/
1
 
(on/standby)
Press to turn the receiver on 
or off (page 28, 37, 38, 54, 
77).
B
SPEAKERS 
(OFF/A/B/A+B)
Press to select the front 
speaker system (page 29).
C
Display
The current status of the 
selected component or a 
list of selectable items 
appears here (page 7). 
D
MULTI 
CHANNEL 
DECODING 
lamp
Lights up when multi 
channel audio is decoded 
(page 38). 
E
Remote sensor
Receives signals from 
remote commander.
F
DISPLAY
Press to select information 
displayed on the display 
(page 64).
Name
Function
G
INPUT MODE
Press to select the input 
mode when the same 
components are connected 
to both digital and analog 
jacks (page 59).
H
MASTER 
VOLUME
Turn to adjust the volume 
level of all speakers at the 
same time (page 34, 35, 37, 
38).
I
MUTING
Press to mute the sound 
(page 35).
J
AUTO CAL
Press to activate the Auto 
Calibration function 
 
(page 30).
K
INPUT 
SELECTOR
Turn to select the input 
source to playback (page 
35, 37, 38, 55, 58, 59, 61, 
63, 65).
L
2CH
Press to select a sound field 
(page 49, 51, 53).
A.F.D.
MOVIE
MUSIC
M
TUNING +/–
Press to scan a station 
(page 55, 58).
N
TUNING MODE
Press to select the tuning 
mode (page 55, 77).
O
MEMORY/
ENTER
Press to store a station or 
enter the selection when 
selecting the settings (page 
28).
P
VIDEO 3 IN/
PORTABLE AV 
IN jacks
Connect to a portable 
audio/video component 
such as a camcorder or 
video game (page 26, 35).
Q
AUTO CAL MIC 
jack
Connects to the supplied 
optimizer microphone for 
the Auto Calibration 
function (page 30).
R
PHONES jack
Connects to headphones 
(page 74).
Page of 74
Display

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  • Disassembly, troubleshooting, programming, maintenance, remote, adjustment, installation and setup instructions.
  • Schematics, wiring and block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).