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2

DVD/LD (Coaxial)

VIDEO 2 (Optical)

MD/TAPE (OUT),
VIDEO 1
(AUDIO OUT)

SUB WOOFER

Gain levels:

±6 dB, 1 dB step

FM tuner section

87.5 - 108.0 MHz

75 ohms, unbalanced

10.7 MHz

Mono:

18.3 dBf, 2.2 

µV/75 ohms

Stereo:

38.3 dBf, 22.5 

µV/75 ohms

11.2 dBf, 1 

µV/75 ohms

Mono:

76 dB

Stereo:

70 dB

Mono:

0.3%

Stereo:

0.5%

45 dB at 1 kHz

30 Hz – 15 kHz,
+0.5/–2 dB

60 dB at 400 kHz

AM tuner section

With 10-kHz tuning scale: 530 – 1710 kHz

6)

With 9-kHz tuning scale: 531 – 1710 kHz

6)

With 10-kHz tuning scale: 530 – 1610 kHz

6)

With 9-kHz tuning scale: 531 – 1602 kHz

6)

With 9-kHz tuning scale: 531 – 1602 kHz

Loop antenna

450 kHz

50 dB/m (at 1,000 kHz or
999 kHz)

54 dB (at 50 mV/m)

0.5 % (50 mV/m, 400 Hz)

At 9 kHz:

35 dB

At 10 kHz:

40 dB

6) You can change the AM tuning scale to 9 kHz or

10 kHz. After tuning in any AM station, turn off
the receiver. Hold down PRESET TUNING + and
press 

. 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.

Video section

Video:

1 Vp-p, 75 ohms

Video:

1 Vp-p, 75 ohms

Sensitivity: –
Impedance: 75 ohms
S/N: 100 dB
(A, 20 kHz LPF)

Sensitivity: –
Impedance: –
S/N: 100 dB
(A, 20 kHz LPF)

Voltage: 250 mV
Impedance: 10 kilohms

Voltage: 2 V
Impedance: 1 kilohms

General

U, CA, MX

120 V AC, 60 Hz

CEL, CEK

230 V AC, 50/60 Hz

MY, SP, AR

220 – 230 V AC, 50/60 Hz

E

120/220/240 V AC, 50/60 Hz

U, MX

STR-K840P: 210 W
STR-K740P: 180 W

CA

STR-K840P: 300 VA
STR-K740P: 260 VA

CEL, CEK, MY, SP,

STR-K840P: 180 W

E, AR

STR-K740P: 155 W

0.5 W

430   145   298 mm
(16 7/8   5 6/8    11 6/8
inches) including
projecting parts and
controls

7.0 kg (15 lb 7 oz)

Design and specifications are subject to change
without notice.

MULTI CH IN

3)

, CD,

MD/TAPE, DVD/LD,
VIDEO 1, 2

MULTI CH IN

3)

, CD,

MD/TAPE, DVD/LD,
VIDEO 1, 2

3) HT-DDW840 only
4) INPUT SHORT (with sound field and tone

bypassed).

5) Weighted network, input level.

10 Hz – 50 kHz
+0.5/–2 dB (with sound
field, and tone bypassed)

Sensitivity: 250 mV
Impedance: 50 kilohms
S/N

4)

: 96 dB

(A, 250 mV

5)

)

•

Abbreviation
U

: US model.

CA

: Canadian model.

CEL

: AEP model.

CEK

: UK model.

SP

: Singapore model. (Malaysia model included.)

MX

: Mexican model.

MY

: Malaysia model.

AR

: Argentine model.

3

0

0

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

0

µ

Ω

• 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 viscous (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.

4

·········································································· 5

······································································ 6

········································································ 8

3-1. Circuit Board Location ·················································· 8
3-2. Block Diagrams – MAIN Section – ···························· 10

– DISPLAY/POWER Section – ··································· 11

3-3. Printed Wiring Board – DIGITAL Section – ··············· 12
3-4. Schematic Diagram – DIGITAL Section (1/2) – ········· 13
3-5. Schematic Diagram – DIGITAL Section (2/2) – ········· 14
3-6. Printed Wiring Board – MAIN Section – ···················· 15
3-7. Schematic Diagram – MAIN Section (1/2) – ·············· 16
3-8. Schematic Diagram – MAIN Section (2/2) – ·············· 17
3-9. Printed Wiring Board – DISPLAY Section – ·············· 18
3-10. Schematic Diagram – DISPLAY Section – ················· 19
3-11. Printed Wiring Board – VIDEO Section – ·················· 20
3-12. Schematic Diagram – VIDEO Section – ····················· 20
3-13. Printed Wiring Board – POWER Section – ················· 21
3-14. Schematic Diagram – POWER Section – ··················· 22
3-15. IC Block Diagrams ······················································ 23
3-16. IC PIN FUNCTION DESCRIPTIONS ······················· 25

······················································ 27

4-1. Front Panel Section ····················································· 27
4-2. Chassis Section-1 ························································ 28
4-3. Chassis Section-2 ························································ 29

······································· 30

Parts No.

MODEL

PARTS No.

K740P : US

4-238-189-2s

K740P : Canadian

4-238-189-3s

K740P : Malaysia,Singapore

4-238-189-4s

K740P : E

4-238-189-5s

K740P : AEP

4-238-189-6s

K740P : UK

4-238-189-7s

K840P : US

4-238-193-0s

K840P : Canadian

4-238-193-1s

K840P : Malaysia, Singapore

4-238-193-2s

K840P : E

4-238-193-3s

K840P : AEP

4-238-193-4s

K840P : UK

4-238-193-5s

K840P : Argentine

4-238-193-8s

K840P : Mexican

4-238-193-9s

5

This section is extracted
from instruction manual.

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+
–

1

7

4

5

2 3

6

90 qaqsqdqf qg qhqjqkqlw; waws

8

FM MODE (Models of area code

CEL, CEK only) ed, (Except for
models of area code CEL, CEK)
ef (32)

INPUT MODE qg (22)
IR (receptor) 4 (39, 46, 52)
LEVEL 0 (16, 20, 28, 57)

MASTER VOLUME wd (20, 50)
MD/TAPE qj (22)
MEMORY eh (31, 33)
MENU +/– e; (16, 28, 36, 37, 57)
MENU </> ea (16, 28, 36, 37, 57)
MODE wj (25, 30, 51)
MULTI CHANNEL DECODING

(indicator) (HT-DDW840 only)
7 (22)

MULTI CH IN (HT-DDW840

only) qf (22)

MUTING wf

8

 (22, 50)

NAME  

(36)

PHONES (jack) ek (22, 51)
PRESET/PTY SELECT +/–

(Models of area code CEL, CEK
only) 3 (33, 34)

PRESET TUNING +/– (Except

for models of area code CEL,
CEK) 3 (33, 54)

PTY (models of area code CEL,

CEK only) ef (34)

SET UP 6 (4, 16, 37, 57)
SHIFT eg (33)
SLEEP (HT-DDW740 only) qf

(37)

SURR qd (28, 57)

TREBLE +/– qh (30, 57)
TUNER ws (22, 32, 33, 36)
TUNING +/– 5 (32)
VIDEO 1 qk (22)
VIDEO 2 w; (22)

?/1 (power) 1 (4, 15, 20, 21,

30, 31, 54)

2 CH wh (26)

A.DEC wk (24, 26)
AM (Except for models of area

code CEL, CEK) es (31, 32)

BASS +/– wg (19, 30, 57)
CD ql (22)
CINEMA STUDIO EX A, B, C

9 (25)

Digital Cinema Sound (indicator)

qs (24)

DIMMER ej (23)
DISPLAY 2 (23, 34, 52)
Display qa 

 (23)

DVD/LD wa (22)

ENTER wl (36)
FM (Except for models of area

code CEL, CEK) ed (31, 32)

FM/AM (Models of area code

CEL, CEK only) es (31, 32)

ek

ej

eh eg ef ed es ea

e;

wl wk wj wh

wg

wf

wd

•

Abbreviation
CEK

: UK model.

CEL

: AEP model.