Sony CFM-20-L Service manual

CFM-20L

SERVICE MANUAL

Ver 1.0 2001.04

SPECIFICATIONS

AEP Model

Model Name Using Similar Machanism CFM-20

Tape Transport Mechanism Type MF-M20-117

9-873-114-11

2001D0200-1

RADIO CASSETTE-CORDER

Sony Corporation

Personal Audio Company

Shinagawa Tec Service Manual Production Group

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

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.

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

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.

SECTION 2

)

DISASSEMBLY

• The equipment can be removed using the following procedure.

Cabinet (front) sub ASSY

Set

CFM-20L

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.

2-1. CABINET (FRONT) SUB ASSY, CABINET (REAR) ASSY

Screws (+ BVTP 3X14)

White

White/red

CNP103

Cabinet (front) sub ASSY

Batt(+) board, Power board

Lid, BATT

Screws (+ BVTP 3X14

Cabinet (rear) ASSY

2-2. MD ASSY

Bracket (VOL)

Remove solder (two place)

CNP102

MD ASSY

Screw (+ BVTP 3X10)

CNP101

Cabinet (rear) ASS

CFM-20L

)

2-3. RECORD/PLAYBACK HEAD (HRP101), REEL/CAPSTAN MOTOR (M101), BELT

• Attaching belt

Flywheel ASS

Belt

Lug (T), plate

Record/playback

head (HRP101)

Guide, tape

Screws Tapping+B (+PTT 2X5(s))

Screw + P2.6X 5

2-4. JACK BOARD , MAIN BOARD

MD ASSY

Belt

Screws + PTT 2X 5

Reel/capstan

motor (M101)

Spring, Compr

Knob (VOL)

MD ASSY

M101

Knob (FUN)

Bracket (PWB)

Screw

(+ BVTP 3X10)

Screw (+ BVTP 3X10)

CNP901

Jack board

Screw (+ BVTP 3X10)

Chassis

Cabinet (rear

Main board

2-5. BATT (+) BOARD, POWER BOARD

)

Cabinet (front)

Pointer

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.

Set the right side edge of Pointer to the scratched line on

Cabinet (front)

Screws

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

Claw

Batt (+) board

Red

White

CFM-20L

Cabinet (rear

Screws (+ BVTP 3X10)

Power board

• DIAL POINTER SETTING

Note : Follow the installation procedure in the numerical order given.

CFM-20L

)

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

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 jack (J101)

load impedance 8Ω

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

test tape P-4-A063J (6.3kHz, -10dB)

set

Ω

J101 (Earphone jack

0dB=0.775V

level meter

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.

Adjustment Location :

Head azimuth adjustment screw

Tape Speed Adjustment

Procedure :

Mode : Playback

test tape WS-48B (3kHz, 0dB)

set

digital frequency counter

8Ω

J101 (Earphone jack)

set

FM Section

Function switch (S101) : FM Volume : MIN

CFM-20L

level mete

8Ω

J101 (Earphone jack)

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 :

tape speed adjustment control inside motor

FM RF signal generator

75kHz frequency deviation by 1kHz signal. Output level : as low as possible

8Ω

set

J101 (Earphone jack)

0.01 F

telescopi antenna terminal

level mete

TUNER SECTION

LW Section

0dB=1µV

Function switch (S101) : LW Volume : MIN CT3, CT4 : mechanical center

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.

+ 15 hidden pages