Read Sony ICF-S79 / ICF-S79L / ICF-S79V (serv.man2) Service Manual online
ICF-S79/S79L/S79V
F l o a t i n g
L a n d
– 9 –
– 10 –
– 11 –
• SCHEMATIC DIAGRAM (ICF-S79V) •
See page 2 for IC Block Diagrams.
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.
•
f
: internal component.
•
C
: panel designation.
•
U
: B+ Line.
•
H
: adjustment for repair.
• Power voltage is dc 4.5 V and fed with regulated dc power
supply from battery terminal.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM (TV2-6ch)
(
no mark : FM (TV2-6ch)
(
) : AM
〈〈
〉〉
: TV (7-13ch)
• 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 (TV2-6ch)
f
: AM
L
: TV (7-13ch)
• Waveforms
– MAIN Board –
– MAIN Board –
1
IC6
wf
(XOUT)
500mV/DIV, 5µs/DIV
2
Q11-1 (Base), -2 (Collector)
200mV/DIV, 100ns/DIV
200mV/DIV, 100ns/DIV
3
Q11-1(Collector)
2V/DIV, 100ns/DIV
2V/DIV, 100ns/DIV
1.8 Vp-p
13.4
µ
s
688 mVp-p
320 ns
5.4 Vp-p
322 ns
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