STR-K740P/K840P
US Model
Canadian Model
AEP Model
UK Model
E Model
SERVICE MANUAL
FM STEREO FM-AM RECEIVER
-- Continued on next page --
SPECIFICATIONS
Ver 1.2 2003. 09
Dolby Laboratories Licensing Corporation.
"DOLBY" the double-D symbol ; "AC-3" and "PRO LOGIC"
are trademarks of Dolby Laboratories Licensing Corporation.
Photo : STR-K840P (SILVER model)
Sony Corporation
Home Audio Company
Published by Sony Engineering Corporation
9-873-544-03
2003I16-1
© 2003.09
POWER OUTPUT AND TOTAL
HARMONIC DISTORTION:
With 8 ohm loads, both channels driven, from
40 20,000 Hz; rated 100 watts (STR-K840P
only)/80 watts (STR-K740P only) per channel
minimum RMS power, with no more than
0.09 % total harmonic distortion from 250
milliwatts to rated output (Models of area code
U only).
Amplifier section
POWER OUTPUT
Models of area code U, CA
Rated Power Output at Stereo Mode
(8 ohms 40 Hz 20 kHz, THD 0.09 %)
STR-K840P:
100 W + 100 W
STR-K740P:
80 W + 80 W
Reference Power Output
(8 ohms 1 kHz, THD 0.7 %)
STR-K840P:
FRONT1):100 W/ch
CENTER1): 100 W
SURR1): 100 W/ch
STR-K740P:
FRONT1): 80 W/ch
CENTER1): 80 W
SURR1): 80 W/ch
Models of area code CEL,CEK
Rated Power Output at Stereo Mode
(8 ohms 1 kHz, THD 0.7 %)
STR-K840P:
100 W + 100 W2)
STR-K740P:
80 W + 80 W2)
Reference Power Output2)
(8 ohms 1 kHz, THD 0.7 %)
STR-K840P:
FRONT1): 100 W/ch
CENTER1): 100 W
SURR1): 100 W/ch
STR-K740P:
FRONT1): 80 W/ch
CENTER1): 80 W
SURR1): 80 W/ch
Models of area code AR, SP
Rated Power Output at Stereo Mode
(8 ohms 1 kHz, THD 0.7 %)
STR-K840P:
90 W + 90 W
Reference Power Output2)
(8 ohms 1 kHz, THD 10 %)
STR-K840P:
FRONT1): 120 W/ch
CENTER1): 120 W
SURR1): 120 W/ch
Models of other area code
Rated Power Output at Stereo Mode
(8 ohms 1 kHz, THD 0.7 %)
STR-K840P:
100 W + 100 W2)
STR-K740P:
80 W + 80 W2)
Reference Power Output2)
(8 ohms 1 kHz, THD 10 %)
STR-K840P:
FRONT1): 120 W/ch
CENTER1): 120 W
SURR1): 120 W/ch
STR-K740P:
FRONT1): 100 W/ch
CENTER1): 100 W
SURR1): 100 W/ch
1) Depending on the sound field settings and the
source, there may be no sound output.
2) Measured under the following conditions:
Area code
Power requirements
E
240 V AC, 50 Hz
SP, CEL, CEK, AR
230 V AC, 50 Hz
MX
120 VAC, 60 Hz
· STR-K740P/K840P are the tuner and the
amplifier section in HT-DDW740/DDW840.
2
STR-K740P/K840P
Inputs (Digital)
DVD/LD (Coaxial)
VIDEO 2 (Optical)
Outputs
MD/TAPE (OUT),
VIDEO 1
(AUDIO OUT)
SUB WOOFER
Tone
Gain levels:
±6 dB, 1 dB step
FM tuner section
Tuning range
87.5 - 108.0 MHz
Antenna terminals
75 ohms, unbalanced
Intermediate Frequency
10.7 MHz
Sensitivity
Mono:
18.3 dBf, 2.2
µV/75 ohms
Stereo:
38.3 dBf, 22.5
µV/75 ohms
Usable sensitivity
11.2 dBf, 1
µV/75 ohms
S/N
Mono:
76 dB
Stereo:
70 dB
Harmonic distortion at 1 kHz
Mono:
0.3%
Stereo:
0.5%
Separation
45 dB at 1 kHz
Frequency response
30 Hz 15 kHz,
+0.5/2 dB
Selectivity
60 dB at 400 kHz
AM tuner section
Tuning range
Models of area code U, CA
With 10-kHz tuning scale: 530 1710 kHz6)
With 9-kHz tuning scale: 531 1710 kHz6)
Models of area code E, AR, MX
With 10-kHz tuning scale: 530 1610 kHz6)
With 9-kHz tuning scale: 531 1602 kHz6)
Models of area code MY, SP, CEL, CEK
With 9-kHz tuning scale: 531 1602 kHz
Antenna
Loop antenna
Intermediate Frequency
450 kHz
Usable sensitivity
50 dB/m (at 1,000 kHz or
999 kHz)
S/N
54 dB (at 50 mV/m)
Harmonic distortion
0.5 % (50 mV/m, 400 Hz)
Selectivity
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
Inputs
Video:
1 Vp-p, 75 ohms
Outputs
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
Power requirements
Area code
Power requirements
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
Power consumption
Area code
Power consumption
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
Power consumption (during standby mode)
0.5 W
Dimensions
430
145
298 mm
(16 7/8
5 6/8
11 6/8
inches) including
projecting parts and
controls
Mass (Approx.)
7.0 kg (15 lb 7 oz)
Design and specifications are subject to change
without notice.
Frequency response
MULTI CH IN3), CD,
MD/TAPE, DVD/LD,
VIDEO 1, 2
Inputs (Analog)
MULTI CH IN3), 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/N4): 96 dB
(A, 250 mV5))
·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
STR-K740P/K840P
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.
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.
LEAKAGE
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)
SAFETY CHECK-OUT
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFÉS PAR UNE MARQUE 0 SUR LES
DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.
To Exposed Metal
Parts on Set
0.15 µF
1.5 k
AC
Voltmeter
(0.75 V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
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 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
STR-K740P/K840P
TABLE OF CONTENTS
1. GENERAL ·········································································· 5
2. TEST MODE ······································································ 6
3. DIAGRAMS ········································································ 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
4. EXPLODED VIEWS ······················································ 27
4-1. Front Panel Section ····················································· 27
4-2. Chassis Section-1 ························································ 28
4-3. Chassis Section-2 ························································ 29
5. ELECTRICAL PARTS LIST ······································· 30
MODEL IDENTIFICATION
-- BACK PANEL --
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
STR-K740P/K840P
SECTION 1
GENERAL
This section is extracted
from instruction manual.
g
+
1
7
4
5
23
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)
M
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)
N S
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)
T Z
TREBLE +/ qh (30, 57)
TUNER ws (22, 32, 33, 36)
TUNING +/ 5 (32)
VIDEO 1 qk (22)
VIDEO 2 w; (22)
BUTTON DESCRIPTIONS
?/1 (power) 1 (4, 15, 20, 21,
30, 31, 54)
ALPHABETICAL ORDER
0 9
2 CH wh (26)
A D
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)
E L
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.