Read Sony ICF-C793 / ICF-C793L Service Manual online
ICF-C793/C793L
– 12 –
– 13 –
– 14 –
5-3.
SCHEMATIC DIAGRAM
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.
•
¢
: internal component.
•
C
: panel designation.
•
U
: B+ Line.
•
H
: adjustment for repair.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
(
no mark : FM
(
) : AM (MW/LW)
• 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.
Note:
The components identi-
fied by mark
The components identi-
fied by mark
!
or dotted
line with mark
!
are criti-
cal for safety.
Replace only with part
number specified.
Replace only with part
number specified.
Note:
Les composants identifiés par
une marque
Les composants identifiés par
une marque
!
sont critiques
pour la sécurité.
Ne les remplacer que par une
pièce por tant le numéro
spécifié.
Ne les remplacer que par une
pièce por tant le numéro
spécifié.
• Waveforms
– MAIN board –
– MAIN board –
1
IC50
2
(X IN)
1 V/DIV, 10 µs/DIV
*3
IC100
@™
(X1)
1 V/DIV, 500 ms/DIV
• IC Block Diagrams
– MAIN board –
– MAIN board –
IC1
CXA1019M
IC50
BU2614FS
FM FE
TUNING METER
AM IF DET AGC
AF POWER AMP
FM IF
FM/AM
IF OUT
FM RF IN
FE GND
NC
AM RF IN
FM RF
FM OSC
REG OUT
AFC
AM OSC
NF
VOL
FM DISCRI
GND
FM/AM BAND
SELECT
FM IF IN
AM IF IN
NC
METER
IF GND
DET OUT
AFC AGC
AFC AGC
AF IN
RIPPLE FILTER
AF OUT
VCC
GND
AM FE
FM
DISCRIMINATOR
14
13
12
11
10
9
8
7
2
1
6
5
3
4
15
16
17
18
19
20
21
22
23
24
25
26
27
28
FM IN
PD1
VSS
VDD2
VDD1
AM IN
P2
IF-IN
XOUT
XIN
CE
CK
DA
CD
P0
P1
16
12
13
14
15
8
9
10
11
4
5
6
1
2
3
7
IF
COUNTER
OUTPUT
CONTROL
I/O CONTROL
REGISTER
MAIN CONTROL
PRESCALLER
PHASE
DETECT
1.9 Vp-p
13.3
µ
s
2 Vp-p
238.7 ns
2
IC100
!ª
(XT1)
1 V/DIV, 20 µs/DIV
2 Vp-p
30.5
µ
s
*
Note:
• Press either
• 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.
• Signal path.
F
: FM
f
: AM (MW/LW)
• Abbreviation
AUS
: Australian model
CND : Canadian model
FR
FR
: French model
SP
: Singapore model
-11
: Suffix-11
-12
: Suffix-12
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