Sony STR-DE235 Service Manual ▷ View online
– 13 –
– 14 –
4-4.
NOTES FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
Note on Printed Wiring Board:
• X
: parts extracted from the component side.
• b
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
•
Indication of transistor.
B
These are omitted.
C
E
Q
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
¢
: internal component.
•
2
: nonflammable 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.
•
U
: B+ Line.
•
V
: B– Line.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : TUNER (FM)
no mark : TUNER (FM)
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
• Signal path.
F
: TUNER (FM)
B
These are omitted.
C
E
Q
• Circuit Boards Location
PRIMARY board
SECONDARY board
STANDBY board
MAIN board
DISPLAY board
POWER SWITCH
board
board
SP SW board
KEY board
TONE board
VOLUME board
STR-DE235
– 15 –
– 16 –
4-5.
PRINTED WIRING BOARD – MAIN Board–
•
See page 14 for Circuit Boards Location.
(Page 17)
(Page 17)
(Page
17)
(Page 18)
(Page 17)
(Page 27)
(Page 31)
D300
G-3
D311
H-7
D312
H-6
D421
H-6
D610
B-6
D710
H-11
D721
G-5
D722
G-5
D723
H-5
D724
G-5
D725
G-5
D726
G-5
D727
H-5
D728
H-5
D801
H-7
D802
D-12
D803
E-12
D804
H-7
D810
B-13
D811
B-13
D812
B-12
D813
B-12
D814
B-12
D815
B-12
D818
C-13
D820
C-12
D821
C-12
D822
C-12
D823
C-12
IC1
B-1
IC300
E-3
IC301
G-4
IC302
F-1
IC401
B-3
IC701
G-7
IC702
C-7
IC801
D-5
IC802
D-5
IC803
A-2
IC804
E-5
IC805
D-3
IC950
A-10
Q361
H-2
Q362
H-2
Q363
H-2
Q365
H-2
Q401
H-6
Q402
C-6
Q451
E-7
Q452
H-5
Q601
C-7
Q602
B-8
Q603
C-8
Q604
B-8
Q610
B-6
Q620
C-7
Q651
F-8
Q652
F-8
Q653
F-8
Q654
E-8
Q670
F-8
Q701
H-7
Q702
H-8
Q703
H-8
Q704
G-8
Q710
H-11
Q720
G-7
Q721
G-5
Q722
G-6
Q723
G-5
Q751
D-7
Q752
D-8
Q753
E-8
Q754
D-8
Q770
D-7
Q801
H-8
Q802
B-13
Q809
C-13
Q951
A-10
Ref. No.
Location
Ref. No.
Location
• Semiconductor Location
(PAGE
31)
31)
STR-DE235
– 17 –
– 18 –
4-6.
PRINTED WIRING BOARDS – SP SW Board/SECONDARY Board/STANDBY Board/PRIMARY Board –
•
See page 14 for Circuit Boards Location.
(Page 16)
(Page 16)
(Page 16)
(Page 18)
(Page 16)
(Page 16)
(Page 17)
STR-DE235
4-7.
SCHEMATIC DIAGRAM – MAIN Board (1/4) –
•
See page 34 for IC Block Diagram.
– 19 –
– 20 –
• Waveforms
– MAIN Board –
– MAIN Board –
1
IC1
!£
(OSCI)
2
IC300
$•
(OSC1) (Change DOLBY Mode)
3
IC301
$º
(LC-INE)
4
IC301
$¡
(CR-OT)
2.7 Vp-p
4.332 MHz
0.4 Vp-p
32.5
µ
s
3.1 Vp-p
125 ns
5.4 Vp-p
4.19 MHz
1.2 Vp-p
122 ns
– DISPLAY Board –
1
IC201
#∞
(X2)
(Page 32)
(Page 24)
(Page 21)
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