Read Sony STR-DE235 Service Manual 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
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