CFM-20L - Sony Audio Service Manual (repair manual)

Model
CFM-20L
Pages
21
Size
1.49 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
cfm-20l.pdf
Date

View Sony CFM-20L Service Manual online

Ver 1.1  2004.05
CFM-20L
SERVICE MANUAL
RADIO CASSETTE-CORDER
SPECIFICATIONS
AEP Model
9-873-114-12
2004E02-1
© 2004.05
Sony Corporation
Personal Audio Company
Published by Sony Engineering Corporation
Model Name Using Similar Machanism
CFM-20
Tape Transport Mechanism Type
MF-M20-117
2
CFM-20L
TABLE OF CONTENTS
Specifications ...........................................................................  1
1.
GENERAL
Location and Function of Controls .................................... 2
2.
DISASSEMBLY
2-1. Cabinet (Front) Sub ASSY,  Cabinet (Rear) ASSY .... 3
2-2. MD ASSY ................................................................... 3
2-3. Record/Playback Head (HRP101),
       Reel/Capstan Motor (M101),Belt ............................... 4
2-4. Jack Board, Main Board ............................................. 4
2-5. Batt (+) Board, Power Board ...................................... 5
3.
ADJUSTMENTS
3-1. Mechanical Adjustments ............................................. 6
3-2. Electrical Adjustments ................................................ 6
4.
DIAGRAMS
4-1. Block Diagrams .......................................................... 9
4-2. Printed Wiring Boards .............................................. 10
4-3. Schematic Diagrams  -Main Section (1/2) - .............. 11
4-4. Schematic Diagrams  -Main Section (2/2) - ............. 12
5.
EXPLODED VIEWS
5-1. Front Cabinet Section ............................................... 15
5-2. Rear Cabinet Section ................................................ 16
5-3. Mechanism Deck Section-1(MF-M20-117) ............. 17
5-4. Mechanism Deck Section-2(MF-M20-117) ............. 18
6.
ELECTRICAL PARTS LIST ........................................ 19
SECTION 1
GENERAL
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 
! OR DOTTED LINE WITH
MARK 
!ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST
ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN
SUPPLEMENTS PUBLISHED BY SONY.
This section is extracted from
instruction manual.
Location and Function of Controls
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice than the minus side of a tantalum capactior may be
  damaged by heat.
3
CFM-20L
SECTION 2
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
2-2. MD ASSY
• The equipment can be removed using the following procedure.
Set
Cabinet (front) sub ASSY
Cabinet (rear) ASSY
Jack board, Main board
Batt(+) board, Power board
MD ASSY
Record/playback head (HRP101),
Reel/capstan motor (M101), Belt
3
1
2
Screws (+ BVTP 3X14)
2
Screws
 (+ BVTP 3X14)
4
Remove solder (two place)
5
CNP103
6
Cabinet (front) sub ASSY
Lid, BATT
Cabinet (rear) ASSY
White
White/red
3
4
CNP102
1
Screw (+ BVTP 3X10)
2
CNP101
5
MD ASSY
Bracket (VOL)
Cabinet (rear) ASSY
2-1. CABINET (FRONT) SUB ASSY, CABINET (REAR) ASSY
4
CFM-20L
2-3. RECORD/PLAYBACK HEAD (HRP101), REEL/CAPSTAN MOTOR (M101), BELT
2-4. JACK BOARD , MAIN BOARD
1
Screws Tapping+B
(+PTT 2X5(s))
MD ASSY
4
Record/playback
    head (HRP101)
8
Reel/capstan
   motor (M101)
MD ASSY
M101
Belt
Flywheel ASSY
• Attaching belt
6
Spring, Compr
3
Screws
 + PTT 2X 5
7
Screw + P2.6X 5
9
Belt
5
Lug (T), plate
2
Guide, tape
7
8
6
1
2
0
4
Screw
(+ BVTP 3X10)
3
Screw
(+ BVTP 3X10)
Jack board
9
 CNP901
Main board
Cabinet (rear)
Knob (VOL)
Knob (FUN)
Chassis
Bracket (PWB)
5
Screw
(+ BVTP 3X10)
5
CFM-20L
2-5. BATT (+) BOARD, POWER BOARD
1
2
4
Claw
3
Screws
 (+ BVTP 3X10)
Power board
Batt (+) board
Red
White
Cabinet (rear)
 DIAL POINTER SETTING
1
2
5
7
Cabinet (front)
Pointer
Cabinet (front)
Cabinet (front)
Scrached line
ECM101
Set the leads from microphone(ECM101)
as shown in the figure.
Set Pointer to "Cabinet
(front)" as shown in the
figure.
4
 Set the right side edge
     of Pointer to the scratched line
     on Cabinet (front).
3
Screws
6
Turn knob (tune) fully in the 
direction of the arrow as shown
in the figure.
Cabinet (rear) ASSY
Cabinet (front)
(+BVTP 3X10)
Pointer
Back plate
Note : Follow the installation procedure in the numerical order given.
6
CFM-20L
  TAPE RECORDER SECTION
FUNOTION switch (S101)
: TAPE (RADIO OFF)
VOLUME (RV101)
: MIN
Standard Output Level
Output terminal
Earphone jack (J101)
load impedance
8
output signal level
0.25V (–10dB)
Test Tape
Type
Signal
Used for
WS-48A
3kHz, 0dB
Tape Speed Adjustment
P-4-A063
6.3kHz
Record/Playback Head
Azimuth Adjustment
Record/Playback Head Azimuth Adjustment
Procedure :
1.Playback Mode
2.Rotate the screw to adjust level meter reading to the maximum.
Note :
Adjust to the maximum peak though there may be two or
three peakes
3.After the adjustment, lock the adjustment screws with suitable
locking compound.
Adjustment Location :
SECTION 3
ADJUSTMENTS
3-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1.Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback head
pinch roller
erase head
rubber belts
capstan
2.Demagnetize the record/playback head with a head demagnetizer.
(Do not bring the head demagnetizer close to the erase head.)
3.Do not use a magnetized screwdriver for the adjustments.
4.After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
Torque Measurement
Forward
CQ-102AS
Forward
CQ-102AS
Back Tension
Fast Forward
CQ-201WS
Rewind
CQ-201WS
Tape Tension  Measurement
Torque Meter
Meter Reading
Torque
Torque Meter
Meter Reading
 1.77 to 5.88 mN•m
(18 to 60 g•cm)
(0.25 to 0.83 oz•inch)
0.01 to 0.49 mN•m
(1 to 5 g•cm)
(0.014 to 0.069 oz•inch)
4.42 to 9.31 mN•m
(45 to 95 g•cm)
(0.63 to 1.31 oz•inch)
4.42 to 9.31 mN•m
(45 to 95 g•cm)
(0.63 to 1.31 oz•inch)
3-2. ELECTRICAL ADJUSTMENTS
CQ-405AS
    more than 60g
(more than 2.12 oz)
 0dB=0.775V
Head azimuth adjustment screw
set
test tape
P-4-A063J
(6.3kHz, -10dB)
8
level meter
J101 (Earphone jack)
+
7
CFM-20L
 FM Section
Function switch (S101)
: FM
Volume
: MIN
Tape Speed Adjustment
Procedure :
Mode : Playback
Adjustment Value :3,000Hz
Standard Value
:2,960 to 3,040Hz
Frequency difference between the beginning and the end of the tape
should be within 1.0% (30Hz).
Adjustment Location :
 TUNER SECTION
 
LW Section
Function switch (S101)
: LW
Volume
: MIN
CT3, CT4
: mechanical center
0dB=1
µV
set
test tape
WS-48B
(3kHz, 0dB)
digital frequency
counter
J101 (Earphone jack)
8
+
tape speed adjustment 
control inside motor
AM  RF signal
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
Put the lead-wire
antenna close to 
the set.
set
+
level meter
J101 (Earphone jack)
8
set
+
level meter
J101 (Earphone jack)
8
FM RF signal
generator
75kHz frequency deviation by 
1kHz signal.
Output level : as low as possible
telescopic
antenna
terminal
0.01  F
µ
8
CFM-20L
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
LW IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
455kHz
LW FREQUENCY COVERAGE  ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
145kHz
CT6
300kHz
LW TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
160kHz
CT5
260kHz
FM FREQUENCY COVERAGE  ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
87.00MHz
CT1
108.30MHz
FM TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
87.00MHz
CT2
108.30MHz
Adjustment Location : MAIN board
FM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
L5
10.7MHz
[MAIN BOARD]
(Conductor side)
CT3 : LW Frequency Coverage Adjustment
         (Set to mechanical center)
CT4 : LW Tracking Adjustment
         (Set to mechanical center)
CT2: FM Tracking Adjustment
CT1 : FM Frequency 
         Coverage Adjustment
[MAIN BOARD]
(Component side)
L5 : FM IF Adjustment
T1: LW IF Adjustment
L1: FM Tracking Adjustment
L3: LW Tracking Adjustment
L4 : LW Frequency 
         Coverage Adjustment
CT5 : LW Tracking Adjustment
CT6 : LW Frequency 
         Coverage Adjustment
L2: FM Frequency 
         Coverage Adjustment
9
9
CFM-20L
SECTION 4
DIAGRAMS
4-1. BLOCK DIAGRAMS
• Signal path.
F
: FM
f
: LW
E
: PB
a
: REC
N
: MIC
VOLUME
ANT1
CT2
CT1
CV1
CV2
CF1
CF2
ECM101
M101
SP101
J101
F901
HRP101
HE101
RV101
T1
L5
L1
L2
J901
CT4
CT3
CV3
CV4
D104
D101
D103
S501
L4
CT5
CT6
FM
TELESCOPIC
ANTENNA
SPRAKER
QUAD
FM RF OUT
BAND SEL
FM OSC
DET OUT
FM RF IN
MIX OUT
FM IF IN
IF AMP,DET,FM MPX
RADIO
+B
REEL/CAPSTAN
MOTOR
(TAPE POWER)
MIC
S102
PB/REC
REC/PB
HEAD
ERASE
HEAD
TRANSFORMER
POWER
T901
IN
MIC
IN
PRE/POWER
AMP
POWER
ON/OFF
AUX
TAPE
AUX
HEAD IN
(+)
HEAD IN
(-)
BTL1
BTL2
REC/PB
DRY BATTERY
SIZE"D"
(IEC DESIGNATION R20)
4PCS,6V
D901,902
RECT
+B
REG
+B
BIAS
BIAS
LINE
OUT
IN
POWER
IC1
IC101
AC IN
ANTENNA
L3
RADIO
+B
REG
Q101
RIPPLE
FILTER
FERRITE-BAR
FM/LW FRONT-END
LW
LW IF IN
LW RF IN
LW OSC
OPR/BATT
+B
+B
RADIO +B
FUNCTION
TAPE/
RADIO OFF
FM
FUNCTION
TAPE/
RADIO OFF
FM
S101-1
S101-2
LW OSC
LW
LW
TRACKING
COVERAGE
FREQUENCY
FM
COVERAGE
FREQUENCY
TRACKING
FM
CT2,L1
CT1,L2
CT5,L3
LW
CT6,L4
LW
FM DET
LW IF
10
10
CFM-20L
JACK BOARD
POWR  BOARD
BATT(+) BOARD
MAIN BOARD
1-680-974-
11
(11)
1-680-977-
11
(11)
1-680-978-
11
(11)
1-680-979-
11
(11)
CV1
CV3
CV2
CV4
CT2
CT4
CT1
CT3
CT6
S501
(TAPE POWER)
M101
REEL/CAPSTAN
MOTOR
M
v
SP101
SPEAKER
L3
LW
FERRITE-BAR
ANTENNA
ANT1
FM
TELESCOPIC ANTENNA
DRY BATTERY
SIZE "D"
(IEC DESIGNATION R20)
4PCS, 6V
AC IN
T901
POWER TRANSFORMER
2
3
4
5
6
7
8
9
10
11
A
1
B
C
D
E
F
G
H
CT5
R118
J101
KH103
JW901
JW902
D902
D901
C901
C902
F901
J901
CNP901
KH901
JW901
JW902
 
 
R101
R102
R103
R104
R105
15
R106
R107
R108
R111
R112
10
R114
16
C101
C103
C108
C109
C113
C114
C115
30
 
C116
C118
C120
20
C123
C130
C105
 
 
 
R4
C13
 
 
R116
R117
S102
(REC/PB)
JC101
C106
R110
R115
R109
5
1
25
IC1
 
 
 
R121
R122
C134
 
 
C7
C2
C3
R2
JC3
C1
C122
C132
R3
C18
JC1
JC2
C19
C20
R1
C15
C9
C10
 
JC4
C136
 
C125
C135
 
 
C102
C104
C107
C110
C111
C117
D1
D2
 
 
 
L2
L5
JW1
JW2
JW4
JW5
JW7
 
JW101
JW102
JW103
JW104
JW105
JW106
JW107
JW108
JW109
JW110
JW111
JW113
C119
D104
OPR/BATT
L1
IC101
D106
 
 
 
C11
 
C12
L4
C4
C5
CNP101
R120
CNP102
KH101
KH102
C121
R113
C112
C124
Q101
C131
R132
R131
C133
S101
CNP103
-2 -1
C16
CF1
CF2
T1
 
C17
C16
JW3
JW6
RV101
VOLUME
 
D101
D102
D103
C21
L10
B C E
S101
FUNCTION
FM
LW
TAPE/RADIO OFF
-2
-1
ECM101
MIC
HRP101
REC/PB
HEAD
HE101
ERASE
HEAD
C126
D108
D107
4-2. PRINTED WIRING BOARDS
Ref. No.
Location
z
 Semiconductor
   Location
   MAIN BOARD
Note:
• X : parts extracted from the component side.
: Pattern on the side which is seen.
f
: internal component.
D1
A-4
D2
A-4
D101
B-5
D102
C-8
D103
B-7
D104
B-8
D106
B-5
D107
A-7
D108
A-8
D901
E-4
D902
E-4
IC1
B-3
IC101
B-7
Q101
B-5

Download Sony CFM-20L Service Manual (Repair Manual)

Here you can view online and download Sony CFM-20L Service Manual in PDF. CFM-20L service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sony CFM-20L Audio. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.