Samsung STR-DE1075 User manual

SERVICE MANUAL
FM STEREO/FM-AM RECEIVER
US Model
Canadian Model
SPECIFICATIONS
STR-DE1075
Ver 1.2 2001.11
9-873-841-13 Sony Corporation
2001K0500-1 Home Audio Company
C2001.11 Published by Sony Engineering Corporation
– Continued on next page –
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 Digital Theater Systems, Inc.
AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL
HARMONIC DISTORTION:
With 8 ohm loads, both channels driven, from
20 –20,000 Hz; rated 100 watts per channel
minimum RMS power, with no more than
0.09 % total harmonic distortion from 250
milliwatts to rated output (US model only).
Amplifier section
POWER OUTPUT
Rated Power Output at Stereo Mode
(8 ohms 20 Hz –20 kHz, THD 0.09 %)
100 W + 100 W
Reference Power Output
(8 ohms 1 kHz, THD 0.7 %)
FRONT1):100 W + 100 W
CENTER1): 100 W
SURR1): 100 W + 100 W
SURR BACK1): 100 W
1) Depending on the sound field settings and the
source, there may be no sound output.
Frequency response
PHONO
CD/SACD, TAPE,
MD/DAT, TV/SAT,
DVD/LD, VIDEO 1, 2,
3
Inputs (Analog)
PHONO
MULTI CH IN (1, 2),
CD/SACD, TAPE,
MD/DAT, DVD/LD,
TV/SAT, VIDEO 1, 2,
3
2) INPUT SHORT.
3) Weighted network, input level.
RIAA equalization curve
±0.5 dB
10 Hz –100 kHz
±3 dB (with sound field,
equalizer, and bass boost
bypassed)
Sensitivity: 2.5 mV
Impedance: 50 kilohms
S/N2): 86 dB (A, 2.5 mV3))
Sensitivity: 150 mV
Impedance: 50 kilohms
S/N2) : 96 dB
(A, 150 mV3))

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STR-DE1075
Inputs (Digital)
DVD/LD (Coaxial)
DVD/LD, TV/SAT,
MD/DAT (Optical)
Outputs
TAPE, MD/DAT
(REC OUT), VIDEO
1, 2 (AUDIO OUT)
FRONT L/R,
CENTER,
SURROUND L/R,
SURROUND BACK,
SUB WOOFER
Sensitivity: –
Impedance: 75 ohms
S/N: 100 dB
(A, 20 kHz LPF)
Sensitivity: –
Impedance: –
S/N: 100 dB
(A, 20 kHz LPF)
Voltage: 150 mV
Impedance: 2.2 kilohms
Voltage: 2 V
Impedance: 2.2 kilohms
EQ
BASS: 99 Hz~1.0 kHz
(21 steps)
MID: 198 Hz~10 kHz
(37 steps)
TREBLE: 1.0 kHz~10 kHz
(23 steps)
Gain levels: ±10 dB, 1 dB step
FM tunersection
Tuning range 87.5 - 108.0 MHz
Antenna terminals 75 ohms, unbalanced
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/75ohms
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
With 10-kHz tuning scale: 530 –1.710 kHz
4)
With 9-kHz tuning scale: 531 –1.710 kHz
4)
Antenna Loop antenna
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 kHz)
Selectivity
At 9 kHz: 35 dB
At 10 kHz: 40 dB
4) You can change the AM tuning scale to 9 kHz or
10 kHz. After tuning in anyAM station, turn off
the receiver. Hold down 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
S-video: Y: 1 Vp-p, 75 ohms
C: 0.286 Vp-p, 75 ohms
Outputs
Video: 1 Vp-p, 75 ohms
S-video: Y: 1 Vp-p, 75 ohms
C: 0.286 Vp-p, 75 ohms
General
Power requirements 120 V AC, 60 Hz
Power consumption 300 W (US model)
375 VA (Canadian model)
AC outlets 2 switched, 120 W/1A
Dimensions 430 ×161 ×401 mm
including projecting parts
and controls
Mass (Approx.) 16.0 kg
Supplied accessories
FM wire antenna (1)
AM loop antenna (1)
Audio/video/control S connecting cord (1)
Control S connecting cord (1)
Remote commander RM-PP505L (1)
R6 (size-AA) batteries (2)
Design and specifications are subject to change
without notice.

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STR-DE1075
Fig. A. Using an AC voltmeter to check AC leakage.
1.5 k Ω 0.15 µF
AC
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0
SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE
DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ
DE FONCTIONNEMENT. NE REMPLACER CES COM-
POSANTS QUE PAR DES PIÈCES SONY DONT LES
NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED
LINE WITH MARK 0ON 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 PUB-
LISHED BY SONY.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-
ing safety check 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 TEST
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 thevoltagedrop acrossaresistor bymeans ofaVOM
or battery-operatedAC 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 pas-
sive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2VAC range are suitable. (See Fig.A)
TABLE OF CONTENTS
1. SERVICING NOTES ............................................... 4
2. GENERAL ................................................................... 5
3. DISASSEMBLY
3-1. Disassembly Flow ........................................................... 6
3-2. Case ................................................................................. 7
3-3. S-VIDEO board, VIDEO Board, Tuner......................... 7
3-4. VIDEO AU Board ........................................................... 8
3-5. DIGITAL Board .............................................................. 8
3-6. MAIN Board ................................................................... 9
4. TEST MODE.............................................................. 10
5. ELECTRICAL ADJUSTMENT............................ 11
6. DIAGRAMS
6-1. Block Diagram – TUNER/VIDEO INPUT Section –... 13
6-2. Block Diagram – AUDIO DSP Section –...................... 14
6-3. Block Diagram – AUDIO CONTROL Section – .......... 15
6-4. Block Diagram – POWERAMP Section – ................... 16
6-5. Block Diagram
– DISPLAY/KEY CONTROL Section –........................ 17
6-6. Block Diagram – POWER SUPPLY Section – ............. 18
6-7. Note for Printed Wiring Boards
and Schematic Diagrams ................................................ 19
6-8. Schematic Diagram – DIGITAL Board (1/5) –............. 21
6-9. Schematic Diagram – DIGITAL Board (2/5) –............. 22
6-10. Schematic Diagram – DIGITAL Board (3/5) – ............. 23
6-11. Schematic Diagram – DIGITAL Board (4/5) – ............. 24
6-12. Schematic Diagram – DIGITAL Board (5/5) – ............. 25
6-13. Printed Wiring Board
– DIGITAL Board (Component Side) – ......................... 26
6-14. Printed Wiring Board
– DIGITAL Board (Conductor Side) –........................... 27
6-15. Printed Wiring Board – VIDEO Board –....................... 28
6-16. Schematic Diagram – VIDEO Board – ......................... 29
6-17. Printed Wiring Boards
– S-VIDEO/VIDEO AU Boards – .................................. 30
6-18. Schematic Diagram
– S-VIDEO/VIDEO AU Boards – .................................. 31
6-19. Printed Wiring Board – MAIN Board – ........................ 32
6-20. Schematic Diagram – MAIN Board (1/3) – .................. 33
6-21. Schematic Diagram – MAIN Board (2/3) – .................. 34
6-22. Schematic Diagram – MAIN Board (3/3) – .................. 35
6-23. Printed Wiring Board – BIAS Board –.......................... 36
6-24. Schematic Diagram – BIAS Board –............................. 37
6-25. Printed Wiring Board – DISP Board – .......................... 38
6-26. Schematic Diagram – DISP Board – ............................. 39
6-27. Printed Wiring Boards
– H.P/JOG/POWER/SP/VIDEO 3/VOL Boards – ......... 40
6-28. Schematic Diagram
– H.P/JOG/POWER/SP/VIDEO 3/VOL Boards – ......... 41
6-29. Printed Wiring Boards
– POWER SUPPLY Section – ........................................ 42
6-30. Schematic Diagram – POWER SUPPLY Section – ...... 43
6-31. IC Pin Function Description ........................................... 49
7. EXPLODED VIEWS
7-1. Case Section .................................................................... 61
7-2. Front Panel Section ......................................................... 62
7-3. Chassis Section-1 ............................................................ 63
7-4. Chassis Section-2 ............................................................ 64
8. ELECTRICAL PARTS LIST ............................... 65
Ver 1.2

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STR-DE1075
SERVICE POSITION
In checking the DIGITAL board, prepare jig (extension cable J-2501-208-A: 200 mm 21 core).
SECTION 1
SERVICING NOTES
MAIN board DIGITAL board
Connect jig (extension cable J-2501-208-A)
to the MAIN board (CN806, 807) and
DIGITAL board (CN1102, 1103).

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STR-DE1075
SECTION 2
GENERAL This section is extracted from
instruction manual.
LOCATION OF CONTROLS
– Front Panel –
2ND ROOM wf (25)
6.1CH DECODING wa (29)
6.1CH DECODING indicator ql
(29)
AM eh (36)
CINEMA STUDIO EX A–C qh
(26)
DIGITAL CONCERT HALL A,
B w; (27)
Cursor buttons ( / ) ef (17,
31, 33, 34, 38, 40)
Digital Cinema Sound indicator
qk (26)
DIMMER 5(25)
DIMMER indicator 8(25)
Display qj (30)
DISPLAY 4(25)
ENTER ed (38)
EQ 0(34)
EQUALIZER wk (34)
FM ej (36)
FM MODE ek (36)
FUNCTION wg (22, 23, 36–38)
INPUT MODE wj (23)
IR receptor 6
Jog dial eg (17, 31, 33, 34, 38,
40)
LEVEL qs (33)
MASTER VOLUME wd (21, 24)
MEMORY r; (37)
MODE wh (23)
MULTI /2CH A. DIRECT wl
(24, 28)
MULTI CHANNEL DECODING
indicator qd
MUTING ws (24)
NAME qg (38)
ON SCREEN ra (8)
PHONES jack 3(24)
PRESET TUNING +/– 7(37)
SET UP qf (17, 40)
SHIFT el (37)
SOUND FIELD 2CH e; (28)
SOUND FIELD A.F.D. es (28)
SOUND FIELD MODE ea (26,
35)
SPEAKERS switch 2(24)
SURR qa (31)
TUNING +/– 9(36)
VIDEO 3 INPUT jacks rs (8)
?/1 (power) 1(16, 21, 22, 35)
•
•
wfwh wgwkeaes wle; wj
12
3qh
4 qs85 9 0qa qdqf qg qjqkql w;wa ws wd67
edrs ej ekelr; ef egeh
ra
– Rear Panel –
7
1234 5 6 8 9 0qa
qs qd qf qh
qg qj qk ql
1DIGITAL jack
2ANTENNA terminal
3CONTROL A1 IIjack
4MONITOR jack
5TV/SAT jack
6DVD/LD jack
7VIDEO 2 jack
8VIDEO 1 jack
9SPEAKERS terminal
0AUDIO OUT jack
qa INPEDANCE SELECTOR
qs MULTI CH IN 2 jack
qd MULTI CH IN 1 jack
qf PHONO jack
qg CD/SACD jack
qh MD/DAT jack
qj TAPE jack
qk 2ND ROOM jack
ql AC OUTLET