HT-1750DP, HT-DDW750, STR-DE495P, STR-K750P - Sony Audio Service Manual (repair manual)

Model
HT-1750DP HT-DDW750 STR-DE495P STR-K750P
Pages
40
Size
6.1 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
ht-1750dp-ht-ddw750-str-de495p-str-k750p.pdf
Date

View Sony HT-1750DP / HT-DDW750 / STR-DE495P / STR-K750P Service Manual online

STR-DE495P/K750P
US Model
Canadian Model
STR-K750P
AEP Model
UK Model
STR-DE495P
E Model
Australian Model
STR-K750P
SERVICE MANUAL
FM STEREO FM-AM RECEIVER
— Continued on next page —
SPECIFICATIONS
Ver 1.1  2004. 08
Dolby Laboratories Licensing Corporation.
“DOLBY” the double-D symbol 
;
  “AC-3” and “PRO LOGIC”
are trademarks of Dolby Laboratories Licensing Corporation.
Photo : STR-K750P
Sony Corporation
Audio Group
Published by Sony Engineering Corporation
9-877-046-02
2004H16-1
© 2004.08
• STR-DE495P/K750P are the tuner and the
amplifier section in HT-DDW750.
POWER OUTPUT AND TOTAL
HARMONIC DISTORTION:
With 8 ohm loads, both channels driven, from
40 – 20,000 Hz; rated 90 watts per channel
minimum RMS power, with no more than
0.7 % 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 0.7 %)
STR-K750P:
90 W + 90 W
Reference Power Output
(8 ohms 1 kHz, THD 0.7 %)
STR-K750P:
FRONT
1)
:100 W/ch
CENTER
1)
: 100 W
SURR
1)
: 100 W/ch
Models of area code CEL,CEK
Rated Power Output at Stereo Mode
(8 ohms 1 kHz, THD 0.7 %)
STR-DE495P:
80 W + 80 W
2)
Reference Power Output
2)
(8 ohms 1 kHz, THD 0.7 %)
STR-DE495P:
FRONT
1)
: 80 W/ch
CENTER
1)
: 80 W
SURR
1)
: 80 W/ch
Models of area code MX
Rated Power Output at Stereo Mode
(8 ohms 1 kHz, THD 0.7 %)
STR-K750P:
90 W + 90 W
Reference Power Output
(8 ohms 1 kHz, THD 0.7 %)
STR-K750P:
FRONT
1)
: 90 W/ch
CENTER
1)
: 90 W
SURR
1)
: 90 W/ch
Models of other area code
Rated Power Output at Stereo Mode
(8 ohms 1 kHz, THD 0.7 %)
STR-K750P:
90 W + 90 W
2)
Reference Power Output
2)
(8 ohms 1 kHz, THD 0.7 %)
STR-K750P:
FRONT
1)
: 90 W/ch
CENTER
1)
: 90 W
SURR
1)
: 90 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
E2/E3
120/220/240 V AC, 50/60 Hz
SP, CEL, CEK
230 V AC, 50 Hz
Frequency response
CD, MD/TAPE, DVD,
VIDEO 1, 2
Inputs (Analog)
CD, MD/TAPE, DVD,
VIDEO 1, 2
3) INPUT SHORT (with sound field and tone
bypassed).
4) Weighted network, input level.
10 Hz – 50 kHz
+0.5/–2 dB (with sound
field and tone bypassed)
Sensitivity: 500 mV
Impedance: 50 kilohms
S/N
3)
: 96 dB
(A, 500 mV
4)
)
2
STR-DE495P/K750P
Design and specifications are subject to change without notice.
Abbreviation
CA
: Canadian model.
CEL
: AEP model.
CEK
: UK model.
SP
: Singapore model. (Malaysia model included.)
MX
: Mexican model.
AU
: Australian model
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 kHz
5)
With 9-kHz tuning scale: 531 – 1710 kHz
5)
Models of area code E2/E3
With 10-kHz tuning scale: 530 – 1610 kHz
5)
With 9-kHz tuning scale: 531 – 1602 kHz
5)
Models of area code CEL, CEK, SP, AU
With 9-kHz tuning scale: 531 – 1602 kHz
Models of area code MX
With 10-kHz tuning scale: 530 – 1610 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
5) 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 ?/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.
Video section
Inputs
Video:
1 Vp-p, 75 ohms
Outputs
Video:
1 Vp-p, 75 ohms
General
Power requirements
Area code
Power requirements
U, CA, MX
120 V AC, 60 Hz
CEL, CEK
230 V AC, 50/60 Hz
SP
220 – 230 V AC, 50/60 Hz
E2/E3
120/220/240 V AC, 50/60 Hz
AU
240 V AC, 50Hz
Power consumption
Area code
Power consumption
U, MX
185 W
CA
270 VA
CEL, CEK, SP, AU 180 W
E2/E3
190 W
Power consumption (during standby mode)
0.3 W
Dimensions
430 
× 145 × 298 mm
(16 7/8 
× 5 6/8 ×  11 6/8
inches) including
projecting parts and
controls
Mass (Approx.)
7.2 kg (15 lb 14 oz)
Sensitivity: –
Impedance: 75 ohms
S/N: 100 dB
(A, 20 kHz LPF)
Sensitivity: –
Impedance: –
S/N: 100 dB
(A, 20 kHz LPF)
Inputs (Digital)
DVD (Coaxial)
VIDEO 2 (Optical)
Outputs
MD/TAPE (OUT),
VIDEO 1
(AUDIO OUT)
SUB WOOFER
Tone
Gain levels:
±6 dB, 1 dB step
Voltage: 500 mV
Impedance: 10 kilohms
Voltage: 2 V
Impedance: 1 kilohms
3
STR-DE495P/K750P
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 
µ
F
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-DE495P/K750P
TABLE OF CONTENTS
MODEL IDENTIFICATION
— BACK PANEL —
Parts No.
MODEL
PARTS No.
US model
4-244-031-0s
Canadian model
4-244-031-1s
Australian model
4-244-031-2s
Singapore model
4-244-031-3s
E
4-244-031-4s
AEP model
4-244-031-5s
UK model
4-244-031-6s
Mexican model
4-244-031-7s
1. GENERAL
·········································································· 5
2. TEST MODE
······································································ 6
3. DIAGRAMS
········································································ 7
3-1.
Circuit Board Location ················································· 7
3-2.
Block Diagrams – MAIN Section – ····························· 8
– DISPLAY/POWER Section – ··································· 9
3-3.
Printed Wiring Board – DIGITAL Board (SIDE A) – 10
3-4.
Printed Wiring Board – DIGITAL Board (SIDE B) – 11
3-5.
Schematic Diagram – DIGITAL Section (1/2) – ······· 12
3-6.
Schematic Diagram – DIGITAL Section (2/2) – ······· 13
3-7.
Printed Wiring Board – MAIN Board – ····················· 14
3-8.
Schematic Diagram – MAIN Section (1/3) – ············· 15
3-9.
Schematic Diagram – MAIN Section (2/3) – ············· 16
3-10. Schematic Diagram – MAIN Section (3/3) – ············· 17
3-11. Printed Wiring Board – POWER Section – ··············· 18
3-12. Printed Wiring Board – DISPLAY Board – ··············· 19
3-13. Schematic Diagram – DISPLAY Section – ················ 20
3-14. Printed Wiring Board – VIDEO Section – ················· 21
3-15. Schematic Diagram – VIDEO Board – ······················ 22
3-16. IC Block Diagrams ····················································· 23
3-17. IC Pin Function Descriptions ····································· 25
4. EXPLODED VIEWS
······················································ 27
4-1. Front Panel Section ····················································· 27
4-2. Chassis Section ··························································· 28
5. ELECTRICAL PARTS LIST
······································· 29

Download Sony HT-1750DP / HT-DDW750 / STR-DE495P / STR-K750P Service Manual (Repair Manual)

Here you can view online and download Sony HT-1750DP / HT-DDW750 / STR-DE495P / STR-K750P Service Manual in PDF. HT-1750DP / HT-DDW750 / STR-DE495P / STR-K750P service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sony HT-1750DP / HT-DDW750 / STR-DE495P / STR-K750P Audio. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.