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E Model

2007G16-1
© 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.

— Continued on next page —

Models of area code SP, SP6, E51, MX, TH

Power Output

1)

Stereo mode (rated) (6 ohms 1 kHz, THD 1%)

70 W + 70 W

Surround mode

2)

 (reference)

(6 ohms 1 kHz, THD 10%)

RMS output

FRONT:100 W 
per channel

CENTER: 100 W

SURROUND: 100 W
per channel

Surround mode

2)

 (reference) 

(10 ohms 100 Hz, THD 10%)

SUB WOOFER: 60 W 
per channel

Models of area code AR

Power Output

1)3)

Stereo mode (rated) (6 ohms 1 kHz, THD 1%)

70 W + 70 W

1)

65 W + 65 W

3)

Surround mode

2)

 (reference)

(6 ohms 1 kHz, THD 10%)

RMS output

FRONT: 
100 W per channel

1)

90 W per channel

3)

CENTER:
100 W

1)

90 W

3)

SURROUND: 
100 W per channel

1)

90 W per channel

3)

Surround mode

2)

 (reference) 

(10 ohms 100 Hz, THD 10%)

SUB WOOFER: 
60 W per channel

1)

50 W per channel

3)

1)

Measured under the following conditions:

SP, SP6, AR, TH

230 V AC, 50 Hz

E51

240 V AC, 50 Hz

MX

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:

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

Tuning range

87.5 - 108.0 MHz

Antenna

FM wire antenna

Antenna terminals

75 ohms, unbalanced

Intermediate frequency

10.7 MHz

AR

220 V AC, 50 Hz

127 V AC, 60 Hz

2

•

Never reuse a disconnected chip component.

•

Notice that the minus side of a tantalum capacitor may be
damaged by heat.

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)

Unleaded solder has the following characteristics.

•

Unleaded solder melts at a temperature about 40 

°

C higher

than ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 

°

C.

Caution: The printed pattern (copper foil) may peel away if

the heated tip is applied for too long, so be careful!

•

Strong viscosity
Unleaded solder is more viscou-s (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.

•

Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.

0

0

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”.

FRONT

CENTER

Area code

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

4)

With 9-kHz tuning scale:

531 – 1,602 kHz

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.

Power requirements

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)

SP, SP6, TH  

230 – 240 V AC, 50/60 Hz

E51

120/220/240 V AC, 
50/60 Hz

AR

220 – 230 V AC, 50/60 Hz

MX

127 V AC, 60 Hz

SP, SP6, E51, AR, 
MX, TH

190 W

Design and specifications are subject to 
change without notice.

• Abbreviation

AR

: Argentine model

E51

: Chilean and Peruvian models

MX

: Mexican model

SP

: Singapore model

SP6

: Singapore and Malaysia models

TH

: Thai model

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

[]

Parts No.

3

...................................................................

4

............................................................... 10

............................. 12

................................................................. 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

5-1.

Front Panel Section ......................................................... 39

5-2.

Chassis Section ................................................................ 40

.................................. 41

4

?/1

9

q;

qf

qa

qd

1

2

3

4

7

6

5

8

qs

A ?

1

Press to turn the receiver 
on or off.

B

Press to adjust the 
brightness of the display.

C

Press to activate the Sleep 
Timer function and the 
duration which the receiver 
turns off automatically. 

D

Press to select 2CH 
STEREO mode.

E

The current status of the 
selected component or a 
list of selectable items 
appears here.

F

Press to select information 
displayed on the display. 

G

Press to activate the Auto 
Calibration function. 

H

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

I

Turn to select the input 
source to playback.

J

Receives signals from 
remote commander.

K

Press to select sound fields 
(MOVIE, MUSIC). 

L

Press to select A.F.D. mode. 

M

Connects to a headphone. 

N

– Connects to the supplied 

optimizer microphone for 
the Auto Calibration 
function. 

– To connect a portable 

audio such as MP3 
player, etc..