Sony ICF-R45 / ICF-T45 Service Manual ▷ View online
ICF-R45/T45
5
2-3. JACK BOARD, MAIN BOARD (T45)
5
2
Holder (jack)
JACK board
3
Remove solder (two places)
1
Remove solder
4
Remove solder (two places)
MAIN board
Cabinet (front) ASSY
Cabinet (rear) ASSY
ICF-R45/T45
6
AM Section
0dB=1
µV
S1: v (EARPHONE)
S3: AM
S3: AM
FM Section
S1: v (EARPHONE)
S3: FM
S3: FM
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
done by the trimmer capacitors.
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
455kHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
520kHz
CT1–1
1,650kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
600kHz
CT1–2
1,400kHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
75.0MHz
CT1–3
109.5MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
75MHz
CT1–4
109.5MHz
FM RF signal
generator
generator
22.5kHz frequency
deviation by 400Hz signal.
Output level : as low as possible
deviation by 400Hz signal.
Output level : as low as possible
set
MAIN board
TP (FM IN)
TP (FM IN)
set
16Ω
v
earphone jack
level meter
SECTION 3
ELECTRICAL ADJUSTMENTS
AM RF signal
generator
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
signal.
Output level : as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
Connection :
Timer Frequency Check
S3 : AM or FM
1. Confirm that the reading of the frequency counter is in the
standard value.
Standerd value : 538 – 636Hz
L1
CF2
C10
D3
C1
C31
L4
C2
R5
R18
R6
CF1
IC1
1
15
TP
(FM IN)
TP(FM IN)
Connection :
[MAIN BOARD] (SIDE B)
C11
R4
R2
R3
R11
R20
TP
(TIMER)
R13
4
R12
R17
R15
C30
L11
C29
C28
R16
C27
IC2
BLK
1
4
5
8
TP
(TIMER)
Frequency counter
[MAIN BOARD] (SIDE A)
ICF-R45/T45
7
Connection :
VR1
S5
S1
S3
CT1-3 : FM Frequency Coverage Adjustment
L3 : FM Frequency Coverage Adjustment
L1 : AM Tracking Adjustment
CT1-2 : AM Tracking Adjustment
CT1-1 : AM Frequency Coverage Adjustment
L2 : FM Tracking Adjustment
T1 : AM IF Adjustment
CT1-4 : FM Tracking Adjustment
L4 : AM Frequency Coverage Adjustment
– MAIN BOARD (SIDE A) –
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
Click on the first or last page to see other ICF-R45 / ICF-T45 service manuals if exist.