Sony ICF-C620 Service Manual ▷ View online
– 9 –
5-2. RADIO SECTION
AM
FM
Put the lead-wire
antanna close to
the set.
antanna close to
the set.
30% amplitude
modulation by
400 Hz signal
modulation by
400 Hz signal
AM rf signal
generator
generator
set
speaker terminal
FM rf signal
generator
generator
22.5 kHz frequency deviation
by 400 Hz signal
output level : as low as possible
by 400 Hz signal
output level : as low as possible
to FM antenna
terminal
terminal
0.01 µF
set
speaker terminal
level meter
(range : 0.5 – 5 V ac)
• Repeat the procedures is each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
done by the trimmer capacitors.
Adjustment Location : main board (component side)
CT2 L2
CT4 L4
CT1 L1
CT3
FM
TRACKING
ADJ
AM
TRACKING
ADJ
T1
AM IF
ADJ
VR2
TAPE SPEED
ADJ
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
455 kHz
AM FREQUENCY COVERAGE
ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
CT2
520 kHz (516.5 kHz)
1,650 kHz (1,631.5 kHz)
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
CT1
600 kHz
1,400 kHz
FM FREQUENCY COVERAGE
ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
CT4
86.5 MHz (87.35 MHz)
109.5 MHz (108.25 MHz)
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
(confirmation)
CT3
86.5 MHz (87.35 MHz)
109.5 MHz (108.25 MHz)
( ) : Italian model
level meter
(range : 0.5 – 5 V ac)
AM
FREQUENCY
COVERAGE ADJ
FM
FREQUENCY
COVERAGE ADJ
– 15 –
• IC Block Diagrams
IC1 CXA1019S
30
29
26
28
27
25
24
1
8
5
3
4
6
7
GND
GND
AF OUT
VCC
RIPPLE
FILTER
AF IN
DET OUT
GND
GND
FM
DISCRI
NF
VOL
AM OSC
AFC
23
20
22
21
19
18
2
11
9
10
12
13
AFC AGC
AFC AGC
IF GND
METER
N.C
FM IF IN
FM OSC
REG OUT
FM RF
AM RF IN
N.C
FM RF IN
17
14
AM IF IN
FE GND
16
15
FM/AM
BAND
FM/AM
IF OUT
AF POWER AMP
FM
DISCRI
FM FE
AM FE
AM IF DET AGC
TUNING
METER
FM IF
22
21
18
20
19
17
16
1
8
5
3
4
6
7
VCC2
CC
PREF
VREG
NF(A)
OUT(A)
GND
PGND
MOTOR
SENSE
EQOUT(A)
EQIN(A)
IN(A)
C
15
12
14
13
2
11
9
10
VCC
OUT(B)
NF(B)
VOL IN
VREF
IN(B)
EQIN(B)
EQOUT(B)
V
REFERENCE
VOLUME
CONTROL
V1
CONVERTER
VOLUME
CONTROL
RIPPLE
FILTER
RIPPLE
FILTER
BASS
BOOST
V
REFERENCE
–
+
PRE AMP
–
+
PRE AMP
+
–
DRIVER
+
–
DRIVER
+
–
DRIVER
+
–
AMP
VREF
50
IC50 CXA1635S
– 16 –
SECTION 7
EXPLODED VIEWS
7-1. REAR CABINET SECTION
N
N
NOTE:
• The mechanical parts with no reference
number in the exploded views are not supplied.
• Items marked “*” are not stocked since
they are seldom required for routine service.
Some delay should be anticipated
when ordering these items.
Some delay should be anticipated
when ordering these items.
• Abbreviation
IT
: Italian model
AUS : Australian model
• -XX and -X mean standardized parts, so
they may have some difference from the
original one.
original one.
• Color Indication of Appearance Parts
Example :
KNOB, BALANCE (WHITE) ... (RED)
Parts Color Cabinet’s Color
• Hardware (# mark) list and accessories
and packing materials are given in the
last of this parts list.
last of this parts list.
The components identified by
mark
mark
! or dotted line with mark.
! are critical for safety.
Replace only with part number
specified.
Replace only with part number
specified.
Les composants identifiés par une
marque
marque
! sont critiques pour
la sécurite.
Ne les remplacer que par une pièce
portant le numéro spécifié.
Ne les remplacer que par une pièce
portant le numéro spécifié.
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
1
3-368-852-01 FOOT
2
3-011-136-01 CABINET (REAR) (US,Canadian,E)
2
3-011-136-11 CABINET (REAR) (AEP,IT)
2
3-011-136-21 CABINET (REAR) (AUS)
3
1-535-804-21 SNAP, BATTERY
4
3-369-135-21 LID, BATTERY CASE
! 5
1-769-339-81 CORD, POWER (E)
! 6
1-769-339-11 CORD, POWER (US,Canadian)
! 7
1-555-795-11 CORD, POWER (AEP,IT)
! 8
1-765-458-11 CORD, POWER (AUS)
9
7-685-648-79 SCREW +P 3X12 TYPE2 NON-SLIT
* 10
1-664-084-11 SECONDARY BOARD
* 11
1-664-083-11 PRIMARY BOARD
! F1
1-532-467-31 FUSE (T315mA/250V) (AEP,IT,AUS)
! PT150
1-431-199-11 TRANSFORMER, POWER (US,Canadian,E)
! PT150
1-431-200-11 TRANSFORMER, POWER (AEP,IT,AUS)
6
5
4
7
8
9
9
2
9
11
10
9
1
3
not supplied
F1
PT150
not supplied
1
– 17 –
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
51
X-3373-808-1 LID ASSY, CASSETTE (US,Canadian,E)
51
X-3373-816-1 LID ASSY, CASSETTE (AEP,IT,AUS)
52
3-011-150-01 PLATE, TRANSPARENT (US,Canadian,E)
52
3-011-150-11 PLATE, TRANSPARENT (AUS)
52
3-011-150-21 PLATE, TRANSPARENT (AEP,IT)
53
3-371-765-11 SCREW (2X8), +BTP
54
3-011-148-01 SPRING (DOOR)
55
3-012-546-01 SPRING (TAPE)
56
3-318-203-61 SCREW (B1.7X4), TAPPING
57
3-011-135-01 CABINET (FRONT)
58
3-011-143-01 BUTTON (STOP)
59
3-011-142-01 BUTTON (FF)
60
3-011-141-01 BUTTON (REW)
61
3-011-140-01 BUTTON (PLAY)
62
3-011-156-01 HOLDER (BUTTON MD)
63
3-011-144-01 BUTTON (EJECT)
64
3-011-157-01 HOLDER (EJECT)
65
3-011-138-01 KNOB (FUNC)
66
3-919-270-01 MARKER
67
3-011-159-01 BUTTON (SNOOZE)
68
3-011-158-01 HOLDER (CLOCK)
* 69
A-3679-859-A MAIN BOARD, COMPLETE (US,Canadian,E)
* 69
A-3679-879-A MAIN BOARD, COMPLETE (AEP)
* 69
A-3679-881-A MAIN BOARD, COMPLETE (IT)
* 69
A-3679-882-A MAIN BOARD, COMPLETE (AUS)
70
3-382-175-21 KNOB (V)
71
3-011-149-01 SPRING (MD)
72
3-011-139-01 POINTER
73
3-011-145-01 KNOB (TUNE)
74
3-351-377-01 DAMPER
75
7-685-547-19 SCREW +BTP 3X10 TYPE2 N-S
76
7-685-648-79 SCREW +P 3X12 TYPE2 NON-SLIT
LED100 1-809-515-11 LED LTC-6512PDK2 (EXCEPT AEP,IT)
LED100 1-809-515-21 LED LTC-6512PDK4 (AEP,IT)
SP1
SP1
1-544-140-31 SPEAKER
7-2. FRONT CABINET SECTION
59
60
61
58
62
53
56
62
66
63
53
54
64
65
69
70
68
67
76
71
72
73
74
75
57
56
55
53
51
52
MR-620
not supplied
not supplied
LED100
SP1
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