Sony CFM-20L Service Manual ▷ View online
13
CFM-20L
• All capacitors are in
µF unless otherwise noted. pF: µµF 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.
•
f
: internal component.
• C : panel designation.
Note: The components identified by mark 0 or dotted line with
mark 0 are critical for safety.
Replace only with part number specified.
Replace only with part number specified.
• A : B+ Line.
• H : adjustment for repair.
• Power voltage is dc 6V and fed with regulated dc power supply
• H : adjustment for repair.
• Power voltage is dc 6V and fed with regulated dc power supply
from external power voltage jack.
• Voltages are dc with respect to ground under no-signal (detuned)
conditions.
no mark : FM
(
no mark : FM
(
) : AM (RADIO SECTION), PLAY (TAPE SECTION)
<
> : MIC REC
[
] : RADIO REC
• Voltages are taken with a VOM (Input impedance 10 M
Ω).
Voltage variations may be noted due to normal production toler-
ances.
ances.
• Signal path.
F
: FM
f
: LW
E
: PB
a
: REC
N
: MIC
Note on schematic Diagram: MAIN SECTION (1/2), (2/2)
14
CFM-20L
• IC BLOCK DIAGRAMS
IC1 TA2132AF (EL)
IC101 MM1315BD
16
15
14
13
FM
OSC
FM RF
OUT
AM/FM
SW
AM RF
IN
12
11
10
9
QUAD
AFC
DET
OUT
AM
OSC
16
15
14
13
FM/AM
FM
OSC
AM
OSC
FM
OSC
FM RF
OUT
AM/FM
SW
AM RF
IN
12
11
10
9
AFC
DET
OUT
AM
OSC
AM
DET
FM
DET
FM
MIX
AM
MIX
AGC
1
2
3
4
AGC
RF
GND
MIX
OUT
FM RF
IN
5
6
7
8
GND
FM IF
IN
AM IF
IN
VCC
AM
RF
FM RF
AF
BUFF
FM
IF
AM
IF
TAPE/AUX
REC/PLAY
MIX/ECM
NC
REC
POWER ON/OFF
AUX-IN
LPF
ALC DEL
P.VCC
P.VCC
POWER GND
PBTL2
POP DEL
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
B+
B+
B+
B+
B+
B+
B+
B+
B+
B+
B+
B+
B+
B+
MIC-IN
POWER GND
POWER IN
LIN-OUT
RIPPLE
FILTER
RIPPLE
FILTER
SIG VCC
SIG-GND
BIAS
VBIAS
TAPE EQ
TAPE NF
HEAD-IN(
–
)
HEAD-IN(+)
MIC N.F
BTL1
21
22
23
24
25
26
27
28
29
30
2
3
5
4
6
7
8
9
10
1
17
18
19
20
11
12
13
14
15
16
CFM-20L
15
SECTION 5
EXPLODED VIEWS
NOTE :
• -XX, -X mean standardized parts, so they
• -XX, -X mean standardized parts, so they
may have some difference from the original
one.
one.
• Items marked “ * ”are not stocked since they
are seldom required for routine service. Some
delay should be anticipated when ordering
these items.
delay should be anticipated when ordering
these items.
• The mechanical parts with no reference
number in the exploded views are not
supplied.
supplied.
• Hardware (# mark) list and accessories and
packing materials are given in the last of this
parts list.
parts list.
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
5-1. FRONT CABINET SECTION
• Abbreviation
CET
:East European & Russian
#2
#1
#1
#1
2
ECM101
3
5
4
1
1
X-3380-637-1 LID, CASSETTE SUB ASSY
2
X-3380-920-1 CABINET (FRONT) SUB ASSY
(INCLUDING SP101)
3
3-226-062-01 SPRING (CAS)
4
3-047-468-21 DAMPER
5
3-226-026-31 LID, BATT
ECM101 8-814-186-00 MICROPHONE, ELECTRET CONDENSER
16
CFM-20L
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
5-2. REAR CABINET SECTION
not supplied
not supplied
ANT1
#2
#2
#3
#2
#2
#2
#4
#2
53
52
51
62
54
55
56
57
58
59
60
61
63
64
65
66
67
69
71
70
72
51
3-226-023-21 KNOB (TUNE)
*
52
A-3021-415-A MAIN BOARD, COMPLETE
53
3-226-052-21 BUTTON (PAUSE)
54
3-226-051-21 BUTTON (STOP)
55
3-226-050-21 BUTTON (FF)
56
3-226-049-21 BUTTON (REW)
57
3-226-048-21 BUTTON (PLAY)
58
3-226-047-21 BUTTON (REC)
59
3-223-488-01 MARKER (REC)
60
1-680-978-11 JACK BOARD
61
3-226-018-01 BRACKET (PWB)
62
1-680-977-11 BATT (+) BOARD
63
3-226-027-21 HANDLE
64
3-226-054-21 KNOB (VOL)
65
3-226-025-21 KNOB (FUN)
66
3-226-065-01 TERMINAL, BATT (+-)
67
3-226-064-01 TERMINAL, BATT (-)
69
3-228-555-21 CABINET (REAR) (AEP)
69
3-228-555-31 CABINET (REAR) (CET)
70
3-226-031-01 TERMINAL, ANT
71
3-226-022-01 GEAR (VC)
72
1-680-979-11 POWER BOARD
ANT1
1-754-160-11 ANTENNA, TELESCOPIC
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