Sony CFM-20 Service manual
CFM-20
SERVICE MANUAL
Ver 1.0 2001.03
SPECIFICATIONS
AEP Model
UK Model
E Model
Model Name Using Similar Machanism CFM-S1
Tape Transport Mechanism Type MF-M20-117
9-873-105-21
2001C0200-1
© 2001.3
RADIO CASSETTE-CORDER
Sony Corporation
Audio Entertainment Group
General Engineering Dept.
CFM-20
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 (AEP, UK, IT, CET, HK, SP, AR model)
Main Board ................................................................. 4
2-5. Batt (+) Board, Power Board
(AEP, UK, IT, CET, HK, SP, AR model) .................... 5
2-6. Batt (+) Board, Power Board
(C&SA, MX, TW model) ........................................... 5
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.
3. ADJUSTMENTS
3-1. Mechanical Adjustments............................................. 7
3-2. Electrical Adjustments ................................................ 7
4. DIAGRAMS
4-1. Block Diagrams ......................................................... 11
4-2. Printed Wiring Boards .............................................. 12
4-3. Schematic Diagrams -Main Section (1/2) - ............. 13
4-4. Schematic Diagrams -Main Section (2/2) - ............. 14
5. EXPLODED VIEWS
5-1. Front Cabinet Section ............................................... 17
5-2. Rear Cabinet Section ................................................ 18
5-3. Mechanism Deck Section-1(MF-M20-117) ............. 19
5-4. Mechanism Deck Section-2(MF-M20-117) ............. 20
6. ELECTRICAL PARTS LIST ........................................ 21
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.
Location and Function of Controls
SECTION 1
GENERAL
This section is extracted from
instruction manual.
2
SECTION 2
)
Y
DISASSEMBLY
• The equipment can be removed using the following procedure.
Cabinet (front) sub ASSY
Set
CFM-20
Record/playback head (HRP101),
Reel/capstan motor (M101), Belt
Cabinet (rear) ASSY
MD ASSY
Jack board, Main board
Note : Follow the disassembly procedure in the numerical order given.
• Abbreviation
SP : Singapore AR :Argentina
HK : Hong Kong MX :Mexican
IT : Italian TW : Taiwan
C&SA : Central and South America
CET : East European & Russian
2-1. CABINET (FRONT) SUB ASSY, CABINET (REAR) ASSY
2
Screws (+ BVTP 3X14)
3
1
Batt(+) board, Power board
Lid, BATT
2
Screws
(+ BVTP 3X14
6
Cabinet (front) sub ASSY
2-2. MD ASSY
3
CNP102
5
CNP103
4
Remove solder (two place)
4
2
CNP101
White
White/red
Cabinet (rear) ASSY
Bracket (VOL)
5
MD ASSY
1
Screw (+ BVTP 3X10)
Cabinet (rear) ASS
3
CFM-20
Y
2-3. RECORD/PLAYBACK HEAD (HRP101), REEL/CAPSTAN MOTOR (M101), BELT
• Attaching belt
Flywheel ASS
Belt
9
Belt
5
Lug (T), plate
4
Record/playback
head (HRP101)
2
Guide, tape
1
Screws Tapping+B
(+PTT 2X5(s))
7
Screws + P2.6X 5
MD ASSY
3
Screws
+ PTT 2X 5
8
Reel/capstan
motor (M101)
6
Spring, Compr
2-4. JACK BOARD (AEP, UK, IT, CET, HK, SP, AR model), MAIN BOARD
knob (VOL)
MD ASSY
knob (FUN)
M101
7
Screw
(+ BVTP 3X10)
9
CNP901
Screw
5
(+ BVTP 3X10)
Jack board
3
Screw
(+ BVTP 3X10)
6
8
4
Chasis
0
1
2
MCabinet (rear)
Main board
4
2-5. BATT (+) BOARD, POWER BOARD
r
)
(AEP, UK, IT, CET, HK, SP, AR model)
1
Claw
2
Batt (+) board
Red
White
4
CFM-20
Cabinet (rear
3
Screws
(+ BVTP 3X10)
2-6. BATT (+) BOARD, POWER BOARD
(C&SA, MX, TW model)
1
Claw
2
4
Power board
Cabinet (rear)
Cord, powe
8
Batt (+) board
PWB, Cord retainer
3
Screw
(+ BVTP 3X10)
Red
White
5
Screws
(+ BVTP 3X10)
6
Power board
7
Remove solder
(two places)
Note on attaching power cord
On attaching power cord, first,
turn it around the projection on
"Cabi, rear" as shown in the
figure and secure it with "PWB,
cord retainer".
5
CFM-20
Y
• DIAL POINTER SETTING
Note : Follow the installation procedure in the numerical order given.
4
Set the right side edge
of Pointer to the center
Back plate
of three scratched lines
on Back plate.
Cabinet (front)
Cabinet (front)
Set Pointer to "Cabinet
(front)" as shown in the
figure.
Pointer
1
2
Pointer
3
Screws
(+BVTP 3X10)
7
6
Turn knob (tuner) fully in the
direction of the arrow as shown
in the figure.
ECM101
5
Set the leads from microphone(ECM101)
as shown in the figure.
Cabinet (rear) ASS
Cabinet (front)
6
SECTION 3
set
test tape
P-4-A063J
(6.3kHz, -10dB)
Speaker output:12
Ω
Earphone jack:8
Ω
level meter
J101 (Earphone jack)AEP, UK, CET, IT, AR, HK, SP model
t
C&SA, MX, TW model
t
KH102 (Speaker output)
+
ADJUSTMENTS
CFM-20
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 sup
ply voltage unless otherwise noted.
Torque Measurement
Torque Torque Meter Meter Reading
Forward CQ-102AS
Forward
Back Tension
CQ-102AS
Fast Forward CQ-201WS
Rewind CQ-201WS
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
TAPE RECORDER SECTION
FUNOTION switch (S101) : TAPE (RADIO OFF)
VOLUME (RV101) : MIN
Standard Output Level
Output terminal Earphone Speaker
load impedance 8Ω 12Ω
output signal level 0.25V (–10dB) 0.775V (0dB)
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
0dB=0.775V
Tape Tension Measurement
Torque Meter Meter Reading
CQ-405AS
more than 60g
(more than 2.12 oz)
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.
• Abbreviation
SP : Singapore AR : Argentina
HK : Hong Kong MX :Mexican
IT : Italian TW : Taiwan
C&SA : Central and South America
CET : East European & Russian
Adjustment Location :
Head azimuth adjustment screw
7
CFM-20
c
Tape Speed Adjustment
Procedure :
Mode : Playback
test tape
WS-48B
(3kHz, 0dB)
C&SA, MX, TW model t
Speaker output:12Ω
Earphone jack:8Ω
set
J101 (Earphone jack)AEP, UK, CET, IT, AR, HK, SP modelt
KH102 (Speaker output)
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 :
digital frequency
counter
+
set
C&SA, MX, TW model t
FM Section
Function switch (S101) : FM
Volume : MIN
FM RF signal
generator
75kHz frequency deviation by
1kHz signal.
Output level : as low as possible
Speaker output:12Ω
Earphone jack:8Ω
J101 (Earphone jack)AEP, UK, CET, IT, AR, HK, SP modelt
KH102 (Speaker output)
µ
0.01 F
telescopi
antenna
terminal
level meter
+
tape speed adjustment
control inside motor
TUNER SECTION
AM Section
Function switch (S101) : AM
Volume : MIN
AM RF signal
generator
0dB=1µV
Put the lead-wire
antenna close to
the set.
Speaker output:12Ω
Earphone jack:8Ω
set
C&SA, MX, TW model t
level meter
+
J101 (Earphone jack)AEP, UK, CET, IT, AR, HK, SP modelt
KH102 (Speaker output)
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
8
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