Sony Walkman WM-GX400, Руководство по обслуживанию

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17
WM-GX400
Common Note on Schematic Diagram:
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F
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.
•
C
: panel designation.
•
A
: B+ Line.
•
H
: adjustment for repair.
• Power voltage is dc 3V and fed with regulated dc power
supply from battery terminal.
• Voltage and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
(
) : AM
<< >> : REC
[
] : PB
• 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.
• Signal path.
F
: FM
f
: AM
E
: PB
a
: REC
N
: MIC
• Abbreviation
CND : Canadian
FR
: French
EA : Saudi Arabia
CH : Chinese
JEW : Tourist
E
: Indication of country of origin (ST, MONO)
9E : No Indication of country of origin
5E : Indication of country of origin (DX, LOCAL)
1
IC401
C
VOLT/DIV : 0.5 V AC
TIME/DIV : 0.1
µ
sec
– MAIN SECTION (1/2) –
z
Waveforms
RADIO mode
3.2Vp-p
26MHz
2
Q334
C
VOLT/DIV : 0.5 V AC
TIME/DIV : 10
µ
sec
– MAIN SECTION (2/2) –
REC mode
2.9Vp-p
48KHz
3
IC701
1
XOUT
VOLT/DIV : 50 mV AC
TIME/DIV : 5
µ
sec
– DISPLAY SECTION –
265mVp-p
75KHz
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