Sony XR-C7220 / XR-C7300 / XR-C7300W Service Manual ▷ View online
– 17 –
6-1.
NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
Note on Printed Wiring Board:
• X
: parts extracted from the component side.
• Y
: parts extracted from the conductor side.
• b
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side:
Pattern face side:
Parts on the pattern face side seen from
(Conductor Side)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Component Side)
the parts face are indicated.
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.
•
%
: indicates tolerance.
•
¢
: internal component.
•
C
: panel designation.
•
U
: B+ Line.
•
H
: adjustment for repair.
• Power voltage is dc 14.4V and fed with regulated dc power
supply from ACC and BATT cords.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
(
no mark : FM
(
) : MW
[
] : SW
〈〈
〉〉
: TAPE PLAY
∗
: Impossible to measure
• 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
: FM
f
: AM (MW/SW)
E
: TAPE PLAY
L
: BUS AUDIO IN
SECTION 6
DIAGRAMS
– 18 –
• Waveforms
– MAIN Board –
– MAIN Board –
1
IC1
2
(OSC OUT)
2
IC501
&¢
(X0A)
3
IC501
(™
(X0)
– KEY Board –
1
IC901
^º
OSC
1.2 Vp-p
0.1
µ
s
3.6 Vp-p
30
µ
s
4.1 Vp-p
270 ns
2.7 Vp-p
27
µ
s
XR-C7220/C7300/C7300W
– 19 –
– 20 –
6-2.
SCHEMATIC DIAGRAM – MAIN Section (1/3) –
•
See page 18 for Waveforms.
•
See page 33 for IC Block Diagrams.
(Page 23)
(Page 21)
XR-C7220/C7300/C7300W
– 21 –
– 22 –
6-3.
SCHEMATIC DIAGRAM – MAIN Section (2/3) –
•
See page 18 for Waveforms.
•
See page 33 for IC Block Diagrams.
(Page
20)
(Page 23)
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