Read Sony STR-DE225 / STR-DE325 Service Manual online
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1.
GENERAL
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3
2.
TEST MODE
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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
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
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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.
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.
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.
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.
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)
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
Ω
AC
Voltmeter
(0.75 V)
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.
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.
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
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)
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
Specifications indicated are measured at 230 VAC, 50 Hz
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