Schematic Diagram - Sony ICF-C793 Service Manual

ICF-C793/C793L
• IC Block Diagrams
– MAIN board –
IC1 CXA1019M
14 13 11 10 9 8 7 6 5 4 3 2 1
12
FM FE
FM
DISCRIMINATOR
FM IF
AM FE AF POWER AMP
TUNING METER
AM IF DET AGC
15 20
16 17 18 19 21 22 23 24 25 26 27 28
IC50 BU2614FS
16 15 14 13 12 11 10 9
PHASE MAIN CONTROL IF
DETECT PRESCALLER COUNTER
OUTPUT
I/O CONTROL
CONTROL
REGISTER
1 2 3 4 5 6 7 8
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 / W or less unless otherwise
4
specified.
• ¢ : internal component.
• C : panel designation.
Note:
Note:
The components identi- Les composants identifiés par
une marque ! sont critiques
fied by mark ! or dotted
line with mark ! are criti- pour la sécurité.
Ne les remplacer que par une
cal for safety.
Replace only with part pièce por tant le numéro
spécifié.
number specified.
• U : B+ Line.
• H : adjustment for repair.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions. • Signal path.
no mark : FM
F : FM
( ) : AM (MW/LW) f : AM (MW/LW)
• Voltages are taken with a VOM (Input impedance 10 MΩ).
• Abbreviation
Voltage variations may be noted due to normal produc- AUS : Australian model
tion tolerances.
CND : Canadian model
• Waveforms are taken with a oscilloscope. FR : French model
Voltage variations may be noted due to normal produc-
SP : Singapore model
tion tolerances. -11 : Suffix-11
• Circled numbers refer to waveforms.
-12 : Suffix-12
– 12 –
5-3.

SCHEMATIC DIAGRAM

• Waveforms
– MAIN board –
1 IC50 2 (X IN)
1 V/DIV, 10 µs/DIV
1.9 Vp-p
13.3 µ s
2 IC100 !ª (XT1)
1 V/DIV, 20 µs/DIV
2 Vp-p
30.5 µ s
*3 IC100 @™ (X1)
1 V/DIV, 500 ms/DIV
2 Vp-p
238.7 ns
*Note:
• Press either [+] or [–] key when RADIO is being
operated, oscillation will be given out for 250 ms.
• Oscillation will be given out for 250 ms when the
power is turned on.
– 13 – – 14 –