Read Sony ICF-R45 / ICF-T45 Service Manual online
ICF-R45/T45
8
SECTION 4
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.
and tantalums.
• All resistors are in Ω and
1
/
4
W or less unless otherwise
specified.
• C : panel designation.
•
: B+ Line.
• H : adjustment for repair.
• Power voltage is dc 3V and fed with regulated dc power
• Power voltage is dc 3V 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
(
no mark : FM
(
)
: AM
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Signal path
.
F
: FM
f
: AM
Note on Printed Wiring Board
• X : parts extracted from the component side.
•
•
a
: Through hole.
•
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side:
Parts on the pattern face side seen from the
(Side B)
pattern face are indicated.
Parts face side:
Parts on the parts face side seen from the
(Side A)
parts face are indicated.
r
IC BLOCK DIAGRAM
IC1 CXA1280N-T4
r
Waveforms
IC2 3
OSC3
OSC3
VOLT/DIV : 1 V AC
TIME/DIV : 0.5 msec
TIME/DIV : 0.5 msec
1
3.0Vp-p
1.8 msec
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
23
GND
AF OUT
RIPPLE
FILTER
AF IN
DET OUT
AFC AGC
AFC AGC
IF GND
METER
N.C
FM IF IN
AM IF IN
FM/AM BAND
SELECT
FM/AM
IF OUT
FM RF IN
N.C
FE GND
AM RF IN
FM RF
REG OUT
FM OSC
AFC
AM OSC
NF
VOL
FM DISCRI
GND
GND
GND
VCC
FM IF
TUNING
METER
METER
FM
DISCRIMINATOR
AF POWER AMP
AM IF DET AGC
FM FE
AM FE
22
21
20
19
18
17
16
24
25
26
27
28
29
30
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