STR-DE225, STR-DE325 - Sony Audio Service Manual (repair manual)

str-de225, str-de325 service manual
Model
STR-DE225 STR-DE325
Pages
33
Size
4.31 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
str-de225-str-de325.pdf
Date

Read Sony STR-DE225 / STR-DE325 Service Manual online

STR-DE225/DE325
AEP Model
Canadian Model
STR-DE225/DE325
US Model
E Model
Australian Model
Chinese Model
STR-DE325
UK Model
STR-DE225
SERVICE MANUAL
FM STEREO/FM-AM RECEIVER
Manufactured under license from Dolby Laboratories
Licensing Corporation.
“DOLBY”, “PRO LOGIC” and the double-D symbol are
trademarks of Dolby Laboratories Licensing Corporation.
MICROFILM
SPECIFICATIONS
Photo : STR-DE225
Amplifier section
Power output
Stereo mode
(DIN 1 kHz, 4 ohms)
STR-DE325: 90 W + 90 W
STR-DE225: 40 W + 40 W
Surround
(DIN 1 kHz, 4 ohms)
mode
Front: STR-DE325: 90W/ch
STR-DE225: 40W/ch
Centre: STR-DE325: 90W
STR-DE225: 40W
(only in PRO LOG IC MODE)
REAR: STR-DE325:
(DIN 1 kHz, 4ohms) 90 W
STR-DE225: (DIN 1 kHz,
4ohms) 40 W
5.1/DVD
Front: 90 W/ch
INPUT * mode
(DIN 1 kHz, 4 ohms)
Centre: 90 W
(DIN 1 kHz, 4 ohms)
Rear: 45 W/ch
(DIN 1 kHz, 8 ohms)
(except STR-DE225)
Frequency
PHONO: RIAA(except  STR-DE225)
response
equalization curve ±0.5 dB
TV / LD, CD, TAPE / MD,
VIDEO, 5.1/DVD INPUT*:
10Hz - 50kHz ±1dB
Input
Sensitivity Impedance S/N
(Weighting
network,
input level)
PHONO
50
74 dB
(STR-DE325)
2.5mV kilohms
72 dB**
(MM)
(A, 2.5 mV)
CD,
5.1/DVD
200 mV
INPUT*
50
82 dB
TAPE/MD,
kilohms
82 dB**
TV/LD,
VIDEO
**’78IHF
Outputs
TAPE/MD REC OUT:
Voltage: 150 mV,
Impedance: 10 kilohms
VIDEO AUDIO OUT:
Voltage: 150 mV,
Impedance: 10 kilohms
WOOFER/MIX AUDIO
OUT: Voltage: 2V
Impedance: 10 kilohms
PHONES: Accepts low and high
impedance headphones
Muting
Full mute
BASS BOOST
+10dB at 70 Hz
TONE
±8dB at 100 Hz and 10 kHz
FM tuner section
Tuning range
87.5 – 108.0 MHz
Aerial terminals
75 ohms, unbalanced
Sensitivity
Mono: 18.3 dBf, 2.2µV /75 ohms
Stereo: 38.3 dBf, 22.5µV /75
ohms
Usable sensitivity
11.2 dBf, 1V /75 ohms (IHF)
S/N
Mono: 76 dB
Stereo: 70dB
Harmonic
Mono: 0.3 %
distortion at
Stereo: 0.5 %
1 kHz
Separation
45dB at 1 kHz
Frequency
30 Hz – 15kHz 
+0.5 
dB
response
Selectivity
60 dB at 400 kHz
AM tuner section
Tuning range
531 – 1602 kHz
Aerial
Loop aerial
Usable sensitivity
50 dB/m (at 999 kHz)
S/N
54 dB(at 50 mV/m)
Harmonic
0.5%(50 mV/m, 400Hz)
distortion
Selectivity
35 dB
–2
— Continued on next page —
— 2 —
1.
GENERAL
·······························································
3
2.
TEST MODE
····························································
4
3.
DIAGRAMS
3-1.
Circuit Boards Location ····················································· 5
3-2.
Block Diagram ··································································· 7
3-3.
Schematic Diagram — Display Section — ························ 9
3-4.
Printed Wiring Boards — Display Section — ·················· 11
3-5.
Schematic Diagram — Power Section — ························ 13
3-6.
Printed Wiring Boards — Power Section — ···················· 15
3-7.
Printed Wiring Boards — Main Section — ······················ 17
3-8.
Schematic Diagram — Main Section (1/3) — ················· 19
3-9.
Schematic Diagram — Main Section (2/3) — ················· 21
3-10. Schematic Diagram — Main Section (3/3) — ················· 23
3-11. IC Pin Function Description ············································· 25
3-12. IC Block Diagrams ··························································· 27
4.
EXPLODED VIEWS
4-1.
Front Panel Section ·························································· 29
4-2.
Chassis Section ································································· 30
5.
ELECTRICAL PARTS LIST
································
31
TABLE OF CONTENTS
    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 microampers).
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
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.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 
!
 OR DOTTED LINE WITH
MARK 
!
 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 
!
 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.
General
System
Tuner section; PLL quartz-locked
digital synthesizer system
Preamplifier section:
Low-noise NF type epualizer
Power amplifier section:
Pure-complimentary SEPP
Power
230 V AC, 50/60 Hz
requirements
Power
STR-DE325: 195 W
consumption
STR-DE225: 110 W
AC outlets
Switched 100 W
(except for the U.K. model)
Dimensions
430 
×
 145 
×
 295 mm
Mass(Approx.)
STR-DE325: 7.4 kg
STR-DE225:  6.1 kg
Supplied
FM wire aerial (1)
accessories
AM loop aerial (1)
Remote controller (remote) (1)
Size AA (R6) batteries (2)
Scart adaptor (1)
Design and specifications are subject to change without notice.
Specifications indicated are measured at 230 VAC, 50 Hz
— 3 —
SECTION 1
GENERAL
1
2 3
5
4
6
7
8
9
!™
!∞
!•
@™
@•
@∞
#™
1
2
3
4
5
6
7
8
9
!™
LOCATION AND FUNCTION OF CONTROLS
[FRONT PANEL]
[REAR PANEL]
1
 POWER switch (I/
u
)
2
 CENTER LEVEL +, – buttons
3
 REAR LEVEL +, – buttons
4
 PRO LOGIC, C.STUDIO, HALL indicators
5
 BASS BOOST indicator
6
 MASTER VOLUME control
7
 BALANCE control
8
 TREBLE control
9
 BASS control
 MUTING button/indicator
 SURROUND ON/OFF button
!™
 BASS BOOST button
 SURROUND EFFECT/DELAY, MODE buttons
 SET UP button
!∞
 TAPE/MD FUNCTION button
 TUNER FUNCTION button
 CD FUNCTION button
!•
 VIDEO FUNCTION button
 TV/LD FUNCTION button
 Numeric buttons
 SHIFT button
@™
 DIRECT TUNING button
 CHARACTER, DISPLAY buttons
 MEMORY button
@∞
 FM/AM button
 PRESET/CHARACTER +, – buttons
 FM MODE button
@•
 SLEEP button
 TUNING/PTY SELECT +, – buttons
 RDS PTY, EON buttons
 PHONES jack
#™
 SPEAKERS A, B ON/OFF buttons
1
 ANTENNA (FM/AM)
2
 
y
 SIGNAL GND
3
 MIX AUDIO OUT
4
 AC OUTLET
5
 AC power cord
6
 FRONT SPEAKERS (A/B)
7
 SURROUND SPEAKERS (CENTER)
8
 SURROUND SPEAKERS (REAR)
9
 VIDEO AUDIO IN, AUDIO OUT
0
 TV/LD AUDIO IN
 TAPE/MD IN, REC OUT
!™
 CD IN
Photo : STR-DE225
Photo : STR-DE225
— 4 —
SECTION 2
TEST MODE
INITIALIZATION 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 depr essing the VIDEO and the TAPE/MD buttons
simultaneously, press the power [I/u] 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/LD and the BASS BOOST buttons
simultaneously, press the power [I/u] button to turn on the main
power.  All segments turn on at the same time, then each segment
turns on one after another.  The message FINISH appears when this
test is complete.
AUTO-BETICAL CHECK MODE
* To auto-scanning and memorise of RDS station. (RDS model only).
* Procedure:
While depressing the MEMORY button, press the power [I/u]
button to turn on the main power.  The message AUTO BET appears
and each function is selected one after another.
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. (for US, CND and E models only)
* Procedure:
Set the FUNCTION to AM.  Turn off the main power.
While depressing the TUNING+ button, press the power [I/u] button
to turn on the main power.  Either the message 9k STEP or 10k
STEP appears.  Select the desired step.
REAR SPEAKER GAIN UP MODE
* The rear speaker gain can be set to either NORMAL or GAIN UP.
* Procedure:
While depressing the -SURROUND- MODE button, press the power
[I/u ] button to turn on the main power. Either the message
NORMAL or GAIN UP appears.  When the product enters this
mode again, the other gain appears.  Select the desired gain.
SOFTWARE VERSION DISPLAY MODE
* The software version is displayed.
* Procedure:
While depressing the TUNER and the BASS BOOST buttons
simultaneously, press the power [I/u] button to turn on the main
power.  The software version is displayed.
Page of 33
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Download Sony STR-DE225 / STR-DE325 Service Manual (Repair Manual)

Here you can read online and download Sony STR-DE225 / STR-DE325 Service Manual in PDF. STR-DE225 / STR-DE325 service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sony STR-DE225 / STR-DE325 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.