Sony Walkman WM-FX571, Руководство по обслуживанию

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WM-FX571
6-4. SCHEMATIC DIAGRAM — TUNER SECTION — • Refer to page 27 for IC Block Diagrams.
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in
Ω
and 1 /
4
W or less unless otherwise
specified.
• % : indicates tolerance.
•
C
: panel designation.
• U : B+ Line.
• H : adjustment for repair.
• Power voltage is dc 1.5 V and fed with regulated dc power
supply from external power voltage jack.
• Voltage and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
(
) : AM
∗
: 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.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
•
: Printed inductor.
• Signal path.
F : FM
f
: AM
Ref. No. Location
D1 B-20
D2 B-19
D3 A-21
D4 D-19
D5 D-17
D6 E-13
D7 E-13
D8 E-14
D9 E-16
IC1 B-13
IC2 B-18
IC3 B-19
IC4 E-13
IC5 B-12
IC6 G-12
IC7 F-20
Q1 A-19
Q2 B-21
Q3 C-20
Q4 C-20
Q5 C-19
Q6 E-20
Q7 D-15
Q8 C-19
Q9 E-15
Q10 F-14
Q11 F-14
Q12 F-13
Q13 G-19
Q14 G-21
Q15 E-18
Q16 D-13
Q17 D-13
Q18 E-17
Q21 A-12
• Semiconductor
Location
Note on Printed Wiring Board:
• r : Through hole.
• b : Pattern from the side which enables seeing.
(The other layer’s patterns are not indicated.)
Caution:
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.