less than 0.09% total
harmonic distortion)
80 W + 80 W
Malaysia, Singapore model
(8 ohms at 1 kHz, THD
0.7%)
80 W + 80 W
Other countries:
(8 ohms at 1 kHz, THD
0.7%)
50 W + 50 W
Canadian model:
(8 ohms at 1 kHz, THD
0.7%)
Front:
80 W/ch
Center:
80 W
Surround:
80 W/ch
Malaysia, Singapore
model
(8 ohm at 1 kHz, THD 10%)
Front: 90 W/ch
Center: 90 W
Surround: 80 W/ch
Other countries:
(8 ohms at 1 kHz, THD
10%)
Front:
50 W/ch
Center:
50 W
Surround:
50 W/ch
TV/SAT, CD, MD/TAPE,
VIDEO, DVD/MULTI
CH: 10 Hz - 50 kHz
dB
SERVICE MANUAL
Ver 1.0 2001. 04
Manufactured under license from Dolby Laboratories Licensing
Corporation.
“DOLBY” the double-D symbol ; “AC-3” and “Pro Logic” are
trademarks of Dolby Laboratories Licensing Corporation.
Audio Entertainment Group
General Engineering Dept.
FM STEREO FM-AM RECEIVER
— Continued on next page —
STR-DE375
Separation
Frequency
response
Selectivity
AM tuner section
Tuning range
Antenna
Intermediate
frequency
Usable sensitivity
S/N
Harmonic
distortion
Selectivity
45 dB at 1 kHz
30 Hz - 15 kHz dB
60 dB at 400 kHz
Malaysia, Singapore model
531 - 1602 kHz (9 kHz
step)
Canadian model:
530 - 1710 kHz (10 kHz
step)*
531 - 1710 kHz (9 kHz
step)*
Other countries models:
530 - 1610 kHz (10 kHz
step)*
531 - 1602 kHz (9 kHz
step)*
Loop antenna
450 kHz
50 dB/m (at 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
+0.5
–2
* You can change the AM tuning interval
between 9 kHz and 10 kHz. Turn off the
receiver and press ?/1 (power) for more
than 4 seconds until “INITIAL” appears.
1) After tuning in any AM station, turn
off the receiver.
2) Hold down PRESET TUNING +
button and press the ?/1 (power)
button. “9k STEP” appears.
To change to 10k Step, repeat step 1 and 2
until “10k STEP” appears. Note that all
preset stations, index names and sound
field are cleared after you make the
procedure above.
General
System
Power
requirements
Tuner section: PLL
quartz-locked digital
synthesizer system
Preamplifier section:
Low-noise NF type
equalizer
Power amplifier section:
Pure-complementary
SEPP
Canadian model:
120 V AC, 60 Hz
Malaysia, Singapore model
220-230 V AC,
50/60 Hz
Other countries:
120/220/240 V AC,
50/60 Hz
Power
consumption
Dimensions
Mass (Approx.)
Supplied
accessories
Canadian model:
240 VA
Standby mode: 0.5 W
Malaysia, Singapore model
175 W
Standby mode: 0.5 W
Other countries:
160 W
Standby mode: 0.5 W
430 x 145 x 298 mm
Malaysia, Singapore model
5.5 kg
Canadian and other
countries:
6 kg (13 lb 4 oz)
• FM wire antenna (1)
• AM loop antenna (1)
• Remote commander
(remote) (1)
• Size AA (R6) batteries (2)
The specification measured
is under
• 230 AC 50 Hz condition
(Malaysia, Singapore model)
Design and specifications are
subject to change without notice.
MODEL IDENTIFICATION
— BACK PANEL —
Parts No.
MODELPARTS No.
AEP model4-232-119-0s
UK model4-232-119-1s
Malaysia,Singapore model4-232-119-3s
E model4-232-119-4s
Canadian model4-232-119-5s
Argentina model4-232-119-7s
2
STR-DE375
SAFETY CHECK-OUT
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 A C leakage. Check leakage as
described below.
LEAKAGE
The A C leakag e from any exposed metal part to earth g round 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. F ollow the manufactur ers’ 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 A C 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 ar e 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)
TABLE OF CONTENTS
1. GENERAL ··········································································4
2. TEST MODE ······································································ 6
3. DIAGRAMS
3-1. Circuit Boards Location ····················································· 7
3-2. Block Diagram ··································································· 9
3-3. Printed Wiring Board Main Section ······························· 10
3-4. Schematic Diagram Main Section (1/3) ·························11
3-5. Schematic Diagram Main Section (2/3) ·························12
3-6. Schematic Diagram Main Section (3/3) ·························13
3-7. Printed Wiring Board Panel Section ······························· 14
3-8. Schematic Diagram Panel Section ································ 15
3-9. Printed Wiring Board Power Section ····························· 16
3-10. Schematic Diagram Power Section ······························· 17
3-11. IC Block Diagrams ··························································· 18
3-12. IC Pin Function Description············································· 18
4. EXPLODED VIEWS
4-1. Front Panel Section ·························································· 20
4-2. Chassis Section································································· 21
5. ELECTRICAL PARTS LIST ······································· 22
To Exposed Metal
Parts on Set
AC
0.15 µF
Fig. A. Using an AC voltmeter to check AC leakage.
1.5 kΩ
Earth Ground
Voltmeter
(0.75 V)
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.
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.
6 VIDEO
7 SUB WOOFER
8 SPEAKERS SURROUND
9 SPEAKERS CENTER
q; SPEAKERS FRONT
8
qa
qs
qa VOLTAGE SELECTOR
(except Singapore, Malaysia and
Canada models)
qs AC power cord
5
STR-DE375
SECTION 2
TEST MODE
FACTORY SET MODE
* All preset contents are reset to the default setting.
* Procedure:
While depressing the VIDEO and the CD b uttons simultaneously,
press the power ?/1 button to turn on the main power. The
message “FACTORY” appears and the present contents are reset
to the default values.
ALL CLEAR MODE
* All preset contents are cleared when this mode is activated. Use
this mode before returning the product to clients upon completion
of repair.
* Procedure:
While depressing the TUNER and the MD/TAPE buttons
simultaneously, press the po wer ?/1 button to turn on the main
power. The message “INITIAL” appears and initialization is
performed.
FLUORESCENT INDICATOR TUBE TEST MODE
* All fluorescent segments are tested. When this test is activated,
all segments turn on at the same time, then each segment turns on
one after another.
* Procedure:
While depressing the TV/SAT and the CD buttons simultaneously ,
press the power ?/1 button to turn on the main power.
1. All segments turn on.
AM CHANNEL STEP 9 kHz/10 kHz
SELECTION MODE
* Either the 9 kHz step or 10 kHz step can be selected for the AM
channel step.
* Procedure:
Set the FUNCTION to AM. Turn off the main power.
While depressing the TUNING+ button or the PRESET+ button,
press the power ?/1 button to turn on the main power. Either
the message “AM 9 k STEP” or “ AM 10 k STEP” appears. Select
the desired step.
* For Canadian/E model only
SOFTWARE VERSION DISPLAY MODE
* The software version is displayed.
* Procedure:
While depressing the TUNER and the VIDEO buttons
simultaneously, press the po wer ?/1 button to turn on the main
power . The model name, destination and the software version are
displayed.
AUTOBETICAL MODE (AEP Model only)
* This mode is installed in the Europe models only . When this mode
is used, the receiver scans the broadcasts that can be received by
tuner, and sets up the broadcasts. Be sure to start scanning after
connecting the antenna.
* Procedure:
Check that the antenna is connected. Press the power ?/1 button
while pressing the MEMORY button to turn on the power. The
message “ Autobetical select” appears and scanning starts by tuner.
SET UP, SOUND FIELD LED turn on.
2. Press the VIDEO button, confirm display
SET UP, NAME LED turn on.
3. Press the VIDEO button, confirm display
SOUND CONTROL LEVEL, SOUND CONTROL SUR and
SOUND FIELD LED turn on.
4. Press the VIDEO button, All segments turn off.
5. Every pressing of the VIDEO button turns on each segment
one after another in the following order.
(Not only the VIDEO button, b ut also the other buttons such as
TV/SAT , MD/TAPE , CD , TUNER can be used.)
SURROUND CLEAR MODE
* The preset sound field is cleared when this mode is activated.
Use this mode before returning the product to clients upon
completion of repair.
* Procedure:
While depressing the SOUND FIELD ON/OFF button, press
the power ?/1 button to turn on the main po wer. The message
“SURR CLR” appears and initialization is performed.
KEY CHECK MODE
* Button check
* Procedure:
While depressing the MD/TAPE and the CD buttons
simultaneously, press the po wer ?/1 b utton to turn on the main
power.
“RES 36 KEY” appears.
Every pressing of any button other than ?/1 counts down the
buttons. The buttons which are already counted once are not
counted again. When all buttons are pressed “RES 00 KEY”
appears.
When MASTER VOLUME is rotated in clockwise direction,
“VOL MIN”, “VOL 1” to “VOL 30”, “VOL MAX” appear.
6
3-1. CIRCUIT BOARDS LOCATION
d
STR-DE375
SECTION 3
DIAGRAMS
PRIMARY board
(except E model)
POWER SWITCH board
HEADPHONE board
SECONDARY board
DISPLAY board
VOL-SEL board (E model)
STANDBY board
MAIN boar
• WAVEFORMS
– MAIN BOARD –
1
IC1 qf
230ns
– DISPLAY BOARD –
2
IC103 qa
200ns
2.2Vp-p
5.0Vp-p
7
STR-DE375
B
These are omitted.
CE
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this necessary note is printed in each
block.)
For schematic diagrams.
Note:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ω and 1/
specified.
•%: indicates tolerance.
•f: internal component.
• 2 : nonflammable resistor.
• 1 : fusible resistor.
• C : panel designation.
Note:
The components identified by
mark ! or dotted line with mark
! are critical for safety.
Replace only with part number
specified.
• A : B+ Line.
• B : B– Line.
• H : adjustment for repair.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
No mark : FM
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production
tolerances.
• Waveforms are taken with a oscilloscope.
• Circled numbers refer to waveforms.
• Signal path.
F: FM
J: CD
• Abbreviation
CND : Canadian model
MY: Malaysia model
SP: Singapore model
AR: Argentina model
W or less unless otherwise
4
Note:
Les composants identifiés par
une marque ! sont critiques
pour la sécurité.
Ne les remplacer que par une
pièce portant le numéro spécifié.