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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 AP-
PEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.ATTENTION AU COMPOSANT AYANT RAPPORT
Ã- 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.
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.
Flexible Circuit Board Repairing
- Keep the temperature of the soldering iron around 270 ËšC during
repairing.
- Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
- Be careful not to apply force on the conductor when soldering or
unsoldering.
FM tuner section
Tuning range87.5 - 108.0 MHz
Antenna terminals
75 ohms, unbalanced
SensitivityMono: 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/NMono: 76 dB
Stereo: 70 dB
Harmonic distortion at 1 kHz
Mono: 0.3%
Stereo: 0.5%
Separation45 dB at 1 kHz
Frequency response
30 Hz -“ 15 kHz
+0.5/-“2 dB
Selectivity60 dB at 400 kHz
AM tuner section
Tuning range
Models of area code U, CA
With 10-kHz tuning
scale:
530 -“ 1710 kHz
6)
With 9-kHz tuning
scale:
531 -“ 1710 kHz
6)
Models of area code AU, CN, SP
With 9-kHz tuning
scale:
531 -“ 1602 kHzModels of area code E
With 10-kHz tuning
scale:
530 -“ 1610 kHz
6)
With 9-kHz tuning
scale:
531 -“ 1602 kHz
6)
AntennaLoop antenna
Usable sensitivity
50 dB/m (at 1,000 kHz
or 999 kHz)
S/N54 dB (at 50 mV/m)
Harmonic distortion
0.5 % (50 mV/m,
400 kHz)
SelectivityAt 9 kHz: 35 dB
At 10 kHz: 40 dB
6) You can change the AM tuning scale to
9 kHz y 10 kHz. After tuning in any AM
station, turn off the receiver. Hold down the
TUNING + button and press the ?/1 button.
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
InputsVideo: 1 Vp-p 75 ohms
S-video:
Y: 1 Vp-p 75 ohms
C: 0.286 Vp-p
75 ohms
OutputsVideo: 1 Vp-p 75 ohms
S-video:
Y: 1 Vp-p 75 ohms
C: 0.286 Vp-p
75 ohmsAC outlets
Models of area code U,
CA
2 switched,
total 120 W/1A
Models of area code
AU, SP
1 switched,
total 100 W
Models of area code E,
CN
2 switched,
total 100 W
Dimensions430 × 158 × 378 mm
(17 × 6
1/4 × 15 in.)
including projecting
parts and controls
Mass (Approx.)
10.3 kg (22 lb 12 oz)
Supplied accessories
-FM wire antenna (1)
-AM loop antenna (1)
-LR6 (size-AA) alkaline batteries (3)
Models of area code U, CA only
-Audio/video/control S
connecting cord (1)
-Control S connecting cord (1)
STR-DE945 only
-Remote commander RM-LJ304
(remote) (1)
STR-DE845 only
-Remote commander RM-LP204
(remote) (1)
Design and specifications are subject
to change without notice.
General
SystemTuner section:
PLL quartz-locked
digital synthesizer
system
Preamplifier section:
Low-noise NF type
equalizer
Power amplifier
section:
Pure-complementary
SEPP
Power requirements
Models of area code U,
CA
120 V AC, 60 Hz
Models of area code
CN, SP
220 -“ 230 V AC,
50/60 Hz
Models of area code AU
240 V AC, 50 Hz
Models of area code E
120/220/240 V AC,
50/60 Hz
Power consumption
Models of area code U
STR-DE945: 290 W
STR-DE845: 280 W
Models of area code CA
STR-DE945: 345 VA
STR-DE845: 335 VA
Models of area code
CN, SP
STR-DE845: 220 W
Models of area code AU
STR-DE845: 230 W
Models of area code E
STR-DE845: 320 W
- Abbreviation
AU : Australian model
CA : Canadian model
CN : Chinese modelMY : Malaysia model
SP : Singapore model
U : US model
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MODEL IDENTIFICATION-“ Rear View -“
Part No.
Fig. A. Using an AC voltmeter to check AC leakage.
1.5 k -„¦ 0.15 µF AC
voltmeter
(0.75 V) To Exposed Metal
Parts on Set
Earth Ground
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 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 pas-
sive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2 V AC range are suitable. (See Fig. A) TABLE OF CONTENTS
1. GENERAL
................................................................... 4
2. DISASSEMBLY ......................................................... 6
3. TEST MODE .............................................................. 9
4. DIAGRAMS
4-1. Block Diagram -“ MAIN Section (1/2) -“........................ 11
4-2. Block Diagram -“ MAIN Section (2/2) -“........................ 12
4-3. Block Diagram
-“ DISPLAY/POWER SUPPLY Section -“...................... 13
4-4. Note for Printed Wiring Boards and
Schematic Diagrams ...................................................... 14
4-5. Schematic Diagram -“ DIGITAL Board (1/3) -“.............. 15
4-6. Schematic Diagram -“ DIGITAL Board (2/3) -“.............. 16
4-7. Schematic Diagram -“ DIGITAL Board (3/3) -“.............. 17
4-8. Printed Wiring Board
-“DIGITAL Board (Component Side) ............................. 18
4-9. Printed Wiring Board
-“DIGITAL Board (Conductor Side) ............................... 19
4-10. Printed Wiring Boards
-“VIDEO/JOINT (1) (H) Boards (DE845) -“................... 20
4-11. Schematic Diagram
-“VIDEO/JOINT (1) (H) Boards (DE845) -“................... 21
4-12. Printed Wiring Boards
-“ OSD/OSD JOINT (H) Boards (DE945) -“................... 22
4-13. Schematic Diagram
-“ OSD/OSD JOINT (H) Boards (DE945) -“................... 23
4-14. Printed Wiring Board -“ AU SW Board -“....................... 24
4-15. Schematic Diagram -“ AU SW Board -“.......................... 25
4-16. Printed Wiring Board -“ S-VIDEO Board -“.................... 26
4-17. Schematic Diagram -“ S-VIDEO Board -“....................... 27
4-18. Printed Wiring Board -“DISPLAY Board -“.................... 28
4-19. Schematic Diagram -“ DISPLAY Board -“...................... 29
4-20. Printed Wiring Board -“ MAIN Board -“......................... 30
4-21. Schematic Diagram -“ MAIN Board (1/3) -“................... 31
4-22. Schematic Diagram -“ MAIN Board (2/3) -“................... 32
4-23. Schematic Diagram -“ MAIN Board (3/3) -“................... 33
4-24. Printed Wiring Boards -“ H.P/MUTING/POWER/
ROTARY/VIDEO 3(DE945)/VOL/
V. SWITCH (E) Boards -“............................................... 34
4-25. Schematic Diagram -“ H.P/MUTING/POWER/
ROTARY/VIDEO 3(DE945)/VOL/
V. SWITCH (E) Boards -“............................................... 35
4-26. Printed Wiring Boards -“ BIAS (C)/BIAS (L)
/BIAS (R)/BIAS (LS)/BIAS (RS)/5.1 IN Boards -“....... 36
4-27. Schematic Diagram -“ BIAS (C)/BIAS (L)
/BIAS (R)/BIAS (LS)/BIAS (RS)/5.1 IN Boards -“....... 37
4-28. Printed Wiring Boards -“DC (1)/DC (2) Boards -“.......... 38
4-29. Schematic Diagram -“DC (1)/DC (2) Boards -“.............. 39
4-30. Printed Wiring Boards -“AC/SP Boards -“....................... 40
4-31. Schematic Diagram -“ AC/SP Boards -“.......................... 41
4-32. IC Pin Function Description ........................................... 46
5. EXPLODED VIEWS ................................................ 56
6. ELECTRICAL PARTS LIST ............................... 59
Model
DE945: US model
DE945: Canadian model
DE845: US model
DE845: Canadian model
Malaysia and Singapore models
Chinese model
Australian model
E and PX models
Part No.
4-226-871-0s
4-226-871-1s
4-226-871-3s
4-226-871-4s
4-226-871-5s
4-226-871-6s
4-226-871-7s
4-226-871-8s
