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2006D16-1
© 2006.04

US Model

Canadian Model

AEP Model

UK Model

E Model

Australian Model

Chinese Model

Manufactured under license from Dolby Laboratories
Licensing Corporation.
“DOLBY”, “PRO LOGIC” and the double-D symbol are
trademarks of Dolby Laboratories Licensing Corporation.

Stereo mode

(DIN 1 kHz, 4 ohms)

90 W + 90 W

Surround

(DIN 1 kHz, 4 ohms)

mode

Front: 90W/ch
Centre: 90W
(only in PRO LOG IC MODE)
REAR: (DIN 1 kHZ, 8ohms) 45 W/ch

5.1/DVD

Front: 90 W/ch

INPUT * mode

(DIN 1 kHz, 4 ohms)
Centre: 90 W (DIN 1 kHz, 4 ohms)
Rear: 45 W/ch (DIN 1 kHz, 8 ohms)

Frequency

PHONO: RIAA

response

equalization curve 

±

0.5 dB

TV / LD, CD, TAPE / MD,
VIDEO, 5.1/DVD INPUT:
10Hz - 50kHz 

±

1dB

Input

Sensitivity Impedance S/N

(Weighting
network,
input level)

PHONO

2.5mV

50

74 dB

(MM)

kilohms

72 dB**

(A, 2.5 mV)

CD,
5.1/DVD

200 mV

INPUT*

50

82 dB

TAPE/MD,

kilohms

82 dB**

TV/LD,

150 mV

(A, 150 mV)

VIDEO

**’78IHF

Outputs

TAPE/MD REC OUT:

Voltage: 150 mV,
Impedance: 10 kilohms

VIDEO AUDIO OUT:

Voltage: 150 mV,
Impedance: 10 kilohms

WOOFER/MIX AUDIO

OUT: Voltage: 2V

Impedance: 10 kilohms

PHONES: Accepts low and high

impedance headphones

Muting

Full mute

BASS BOOST

+10dB at 70 Hz

TONE

±

8dB at 100 Hz and 10 kHz

Tuning range

87.5 – 108.0 MHz

Aerial terminals

75 ohms, unbalanced

Sensitivity

Mono: 18.3 dBf, 2.2

µ

V /75 ohms

Stereo: 38.3 dBf, 22.5

µ

V /75 ohms

Usable sensitivity

11.2 dBf, 1V /75 ohms (IHF)

S/N

Mono: 76 dB
Stereo: 70dB

Harmonic

Mono: 0.3 %

distortion at

Stereo: 0.5 %

1 kHz
Separation

45dB at 1 kHz

Frequency

30 Hz – 15kHz  

+0.5 

dB

response
Selectivity

60 dB at 400 kHz

–2

— Continued on next page —

Tuning range

531 – 1602 kHz

Aerial

Loop aerial

Usable sensitivity

50 dB/m (at 999 kHz)

S/N

54 dB(at 50 mV/m)

Harmonic

0.5%(50 mV/m, 400Hz)

distortion
Selectivity

35 dB

Input

VIDEO 1, 2, TV:

1 Vp-p 75 ohms

Output

VIDEO 1, 2, MONITOR:

1 Vp-p 75 ohms

System

Tuner section; PLL

quartz-locked digital
synthesizer system

Preamplifier section:

Low-noise NF type
epualizer

Power amplifier section:

Pure-complimentary
SEPP

Power

230 V AC, 50/60 Hz

requirements
Power

230 W

consumption
AC outlets

Switched 100 W

(except for the U.K.
model)

— 2 —

·······························································

3

····························································

4

3-1.

Circuit Boards Location ····················································· 5

3-2.

Block Diagram ··································································· 7

3-3.

Schematic Diagram — Display Section — ························ 9

3-4.

Printed Wiring Board — Display Section — ··················· 11

3-5.

Schematic Diagram — Power Section — ························ 13

3-6.

Printed Wiring Board — Power Section — ····················· 15

3-7.

Printed Wiring Board — Main Section — ······················· 17

3-8.

Schematic Diagram — Main Section (1/3) — ················· 19

3-9.

Schematic Diagram — Main Section (2/3) — ················· 21

3-10. Schematic Diagram — Main Section (3/3) — ················· 23
3-11. IC Pin Function Description ············································· 25
3-12. IC Block Diagrams ··························································· 27

4-1.

Front Panel Section ·························································· 29

4-2.

Chassis Section ································································· 30

································

31

       After correcting the original service problem, perform the
following safety checks 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.

    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 microampers).
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 2V AC range are suitable. (See
Fig. A)

µ

Ω

!

!

!

Dimensions

430 

×

 145 

×

 295 mm

Mass(Approx.)

STR-DE425: 7.9 kg

Supplied

FM wire aerial (1)

accessories

AM loop aerial (1)
Remote controller (remote) (1)
Size AA (R6) batteries (2)

Design and specifications are subject to change without notice.
Specifications indicated are measured at 230 VAC, 50 Hz

— 3 —

1

2 3

5

6

7

8

9

!º

!¡

!™

!£

!¢

!§

!∞

!ª

!¶

!•

@º

@¡

@•

@ª

@£

@¶

@¢

@§

@∞

@™

#º

#¡

4

1

2

3 45

7

8

6

9

!º

!¡

!™

!£

!¢

!∞

1

 POWER switch (I/

u

)

2

 CENTER LEVEL +, – buttons

3

 REAR LEVEL +, – buttons

4

 PRO LOGIC, C.STUDIO, HALL indicators

5

 5.1/DVD INPUT, BASS BOOST indicators

6

 MASTER VOLUME control

7

 BALANCE control

8

 TREBLE control

9

 BASS control

!º

 MUTING button/indicator

!¡

 SURROUND ON/OFF button

!™

 SURROUND EFFECT/DELAY, MODE buttons

!£

 SET UP, 5.1/DVD INPUT, BASS BOOST buttons

!¢

 TV/LD button

!

∞

 TAPE/MD button

!§

 PHONO button

!¶

 TUNER button

!•

 CD button

!ª

 VIDEO button

@º

 Numeric buttons

@¡

 DIRECT TUNING, SHIFT buttons

@™

 CHARACTER, DISPLAY buttons

@£

 MEMORY button

@¢

 FM/AM button

@

∞

 PRESET/CHARACTER +, – buttons

@§

 FM MODE button

@¶

 SLEEP button

@•

 TUNING/PTY SELECT +, – buttons

@ª

 RDS PTY, EON buttons

#º

 PHONES jack

#¡

 SPEAKERS A, B ON/OFF buttons

1

 ANTENNA (FM/AM)

2

 5.1/DVD INPUT

3

 

y

 SIGNAL GND

4

 MONITOR

5

 WOOFER

6

 FRONT SPEAKERS (A/B)

7

 AC OUTLET

8

 AC power cord

9

 SURROUND SPEAKERS (CENTER)

0

 SURROUND SPEAKERS (REAR)

!¡

 VIDEO

!™

 TV/LD

!£

 TAPE/MD

!¢

 CD

!

∞

 PHONO

— 4 —

* All preset contents are cleared when this mode is activated.  Use
this mode before returning the product to clients upon completion
of repair.
* Procedure:
While depressing the VIDEO and the TAPE/MD buttons
simultaneously, press the power [I/

u] button to turn on the main

power.  The message INITIAL appears and initialization is
performed.

* All fluorescent segments are tested.  When this test is activated,
all segments turn on at the same time, then each segment turns on
one after another.
* Procedure:
While depressing the TV/LD and the BASS BOOST buttons
simultaneously, press the power [I/

u] button to turn on the main

power.  All segments turn on at the same time, then each segment
turns on one after another.  The message FINISH appears when this
test is complete.

* To auto-scanning FM board and memorise RDS station. (FM/
RDS model only)
* Procedure:
While depressing the MEMORY button, press the power [I/

u]

button to turn on the main power.  The message AUTO BET appears
and each function is selected one after another.

* Either the 9 kHz step or 10 kHz step can be selected for the AM
channel step. (US, CND and E model only)
* Procedure:
Set the FUNCTION to AM.  Turn off the main power.
While depressing the TUNING+ button, press the power [I/

u] button

to turn on the main power.  Either the message 9k STEP or 10k
STEP appears.  Select the desired step.

* The rear speaker gain can be set to either NORMAL or GAIN UP.
* Procedure:
While depressing the -SURROUND- MODE button, press the power
[I/

u ] button to turn on the main power. Either the message

NORMAL or GAIN UP appears.  When the product enters this
mode again, the other gain appears.  Select the desired gain.

* The software version is displayed.
* Procedure:
While depressing the TUNER and the BASS BOOST buttons
simultaneously, press the power [I/

u] button to turn on the main

power.  The software version is displayed.