Sony ICF-C620L Service Manual ▷ View online
– 9 –
5-2. RADIO SECTION
MW/LW
Setting :
Function selector : RADIO ON
BAND switch
Function selector : RADIO ON
BAND switch
: MW or LW
VOLUME control : minimum
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
455 kHz
MW FREQUENCY COVERAGE
ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
CT2
520 kHz
1,650 kHz
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1-1
CT1
600 kHz
1,400 kHz
LW FREQUENCY COVERAGE
ADJUSTMENT
Adjust for a maximum reading on level meter.
(confirmation)
TC2
145 kHz
261 kHz
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1-2
TC1
160 kHz
240 kHz
FM FREQUENCY COVERAGE
ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
CT4
86.5 MHz
109.5 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
(confirmation)
CT3
86.5 MHz
109.5 MHz
30% amplitude
modulation by
400 Hz signal
modulation by
400 Hz signal
AM rf signal
generator
generator
speaker terminal
level meter
(range : 0.5 – 5 V ac)
set
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
µ
F
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)
FM
Setting :
Function selector : RADIO ON
BAND switch
Function selector : RADIO ON
BAND switch
: FM
VOLUME control : minimum
CT4
L4
L4
L2
CT2
CT2
CT3
FM
TRACKING
ADJ
TC1
L1-2
L1-2
LW
TRACKING
ADJ
FM FREQUENCY
COVERAGE ADJ
COVERAGE ADJ
MW FREQUENCY
COVERAGE ADJ
COVERAGE ADJ
L1-1 CT1
MW
TRACKING
ADJ
TC2
LW
FREQUENCY
COVERAGE ADJ
T1
AM IF
ADJ
Put the lead-wire
antanna close to
the set.
antanna close to
the set.
– 15 –
• IC Block Diagrams
IC1 CXA1019S
IC50 CXA1635S
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
1
2
3
4
5
6
7
8
9
10
15
14
13
12
11
FM
DISCRIMINATOR
AF POWER AMP
AM FE
FM IF
TUNING
METER
AM IF DET AGC
FM FE
23
22
21
20
24
25
19
18 17 16
29 28 27 26
30
GND
GND
AF OUT
VCC
RIPPLE
FIL
TER
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
FE GND
N.C
AM RF IN
FM RF
REG OUT
FM OSC
FM RF IN
AFC
AM OSC
VOL
NF
FM DISCRI
GND
GND
IC51 MM1038CFF
VREF
6
5
7
8
3
4
2
1
PC OU
T
GND
GND
VS
VCC
PHASE
SPEED ADJ
SW
Note :
• All capacitors are in
• All capacitors are in
µ
F unless otherwise noted. pF :
µµ
F 50 WV
or less are not indicated except for electrolytics and tantalums.
• All resistors are in
Ω
and 1/4 W or less unless otherwise
specified.
•
¢
: internal component.
Note : The components identified by mark
!
or dotted line
with mark
!
are critical for safety.
Replace only with part number specified.
•
: B+ Line.
•
: adjustment for repair.
• Voltage is dc with respect to ground under no-signal (detuned)
conditions.
• no mark : FM
( ) : MW
< >
< >
: PB
• Voltage are taken with a VOM (Input Impedance 10 M
Ω
).
Voltage variations may be noted due to normal production
tolerance.
tolerance.
• Signal path.
: FM
: MW
: PB
B
– 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.
• -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
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
4
7
9
9
2
9
1
3
not supplied
F1
PT150
not supplied
1
8
5
6
• Accessories and packing materials
are given in the 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.
1
3-368-852-01 FOOT
2
3-011-136-21 CABINET (REAR)
3
1-535-804-21 SNAP, BATTERY
4
3-369-135-21 LID, BATTERY CASE
* 5
1-664-083-21 PRIMARY BOARD
* 6
1-664-084-21 SECONDARY BOARD
! 7
1-555-795-00 CORD, POWER (AEP)
! 8
1-696-572-21 CORD, POWER (UK)
9
7-685-648-79 SCREW +P 3X12 TYPE2 NON-SLIT
10
3-019-648-01 SHEET, INSULATION
! F1
1-532-235-00 FUSE (T315mAL/250V)
! PT150
1-431-200-11 TRANSFORMER, POWER
9
10
– 17 –
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
7-2. FRONT CABINET SECTION
59
60
61
58
56
62
66
63
54
64
65
69
70
68
67
76
71
72
73
74
75
57
56
55
53
51
52
MR-620
not supplied
LED100
SP1
51
X-3373-816-1 LID ASSY, CASSETTE
52
3-011-150-31 PLATE, TRANSPARENT (AEP)
52
3-011-150-41 PLATE, TRANSPARENT (UK)
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
3-011-135-11 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-3679-884-A MAIN BOARD, COMPLETE (AEP)
* 69
A-3679-886-A MAIN BOARD, COMPLETE (UK)
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
* 77
3-019-024-01 BRACKET (MD)
78
7-685-106-01 SCREW +P 2X10 TYPE1
* 79
A-3679-924-A SERVO BOARD, COMPLETE
* 80
3-019-717-01 SPACER
LED100 1-809-515-11 LED LTC-6512PDK2 (UK)
LED100 1-809-515-21 LED LTC-6512PDK4 (AEP)
SP1
SP1
1-544-140-21 SPEAKER
62
78
77
79
80
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