Sony CFM-A50 Bedienungsanleitung

CFM-A50

SERVICE MANUAL

RADIO CASSETTE-CORDER

SPECIFICATIONS

US Model

AEP Model

UK Model

Radio section

Frequency range

FM 87.6 – 108MHz (US model)

FM 87.6 – 107MHz (AEP, UK model)

AM 530 – 1,710kHz (US model)

MW 531 – 1,602kHz (AEP, UK model)

LW 153 – 279kHz (AEP, UK model)

Aerials

FM : Telescopic aerial

AM : Built-in ferrite bar aerial

Cassette-corder section

Recording system

2-track 1channel monaural

Fast winding time

Approx. 120 s (sec.) with Sony cassette C-60

Frequency response

TYPE I (normal) : 100 – 8,000Hz

General

Speaker

Full range : 9.2cm dia.,4 ohms, cone type (1)

Output

Earphone jack (minijack)

For 32 ohms impedance earphone

Maximum power output

2.3 W

Power requirements

120V AC, 60Hz (US model)

230V AC, 50Hz (AEP, UK model)

6V DC, four R20 (size D) batteries

Power consumption

AC 6W

Battery life

FM recording

Sony R20P : approx. 13h

Sony alkaline LR20 : approx. 35h

Tape playback

Sony R20P : approx. 7h

Sony alkaline LR20 : approx. 20h

Dimensions

Approx. 289 x 200 x 123 mm (w/h/d)

(111/2 x 7 7/8 x 4 7/8inches) (incl. projecting parts)

Mass

Approx. 2.4 kg (5 lb. 5 oz) (incl. batteries)

Supplied accessory

AC power cord (1)

Earphone (1)

Design and specifications are subject to change without notice.

Model Name Using Similar Machanism NEW

Tape Transport Mechanism Type MF-A50-117

Ver. 1.2 2005.06

9-923-167-14

2005F02-1

Sony Corporation

Personal Audio Group

Published by Sony Engineering Corporation

– 2 –

Specifications ........................................................................... 1

1. GENERAL

Location and Function of Controls .................................... 3

2. DISASSEMBLY

2-1. Cabinet (Rear) Removal ............................................. 4

2-2. ISS SW Board, Battery Case,

BATTERY Board, POWER Board Removal ............. 4

2-3. Main Board, TUN LED Board,

TACT SW Board Removal ........................................ 5

2-4. H/P JACK Board, Door Ear (PH),

Box Ear (PH) Removal ............................................... 5

2-5. Mechanism Deck, DECK CONTROL Board

Volume Board Removal .............................................. 6

3. DIAL POINTER SETTING......................................... 7

4. ADJUSTMENTS

4-1. Mechanical Adjustment .............................................. 8

4-2. Electrical Adjustment ................................................. 8

5. DIAGRAMS

5-1. Schematic Diagram (AEP,UK Model)...................... 12

5-2. Printed Wiring Boards (AEP,UK Model) ................. 15

5-3. Printed Wiring Boards (US Model) .......................... 19

5-4. Schematic Diagram (US Model) .............................. 23

6. EXPLODED VIEWS

6-1. Cabinet (Rear) Section.............................................. 28

6-2. Cabinet (Front) Section ............................................ 29

6-3. Mechanism Deck Section-1 (MF-A50-117) ............. 30

6-4. Mechanism Deck Section-2 (MF-A50-117) ............. 31

7. ELECTRICAL PARTS LIST.................................... 32

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK !OR DOTTED LINEWITH

MARK !ON THE SCHEMATIC DIAGRAMS AND INTHE PARTS

LIST ARE CRITICALTO SAFE OPERATION.

REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE

PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN

SUPPLEMENTS PUBLISHED BY SONY.

TABLE OF CONTENTS

HOWTO CHANGEDTHE CERAMIC FILTERS

This model is used three ceramic filters of CF2, CF4 and CF3.

You must used same type of color marked ceramic filters in order

to meet same specifications.

Therefore, the ceramic filter must changed three pieces together

since it's supply three pieces in one package as a spare parts.

Mark Center

fequency

red

blue

orange

black

white

10.70MHz

10.67MHz

10.73MHz

10.64MHz

10.76MHz

mark mark

CF2, 4 CF3

– 3 –

SECTION 1

GENERAL

LOCATION AND FUNCTION OF CONTROLS

This section is extracted from

instruction manual.

1FM telescopic aerial

2Carrying handle

3Dial scale

4@(earphone) jack (mini jack)

5LIGHT (Dial scale light) button

6Tape operation buttons

7EARPHONE POCKET box

8SLOW PLAYBACK button

9Cassette compartment lid

!º Frequency marker

!¡ OPR/BATT indicator

!™ EASY LISTENING ADJUSTMENT switch

!£ EASY LISTENING ADJUSTMENT control

!¢ BAND switch

!∞TUNING control

!§ VOLUME control

!¶ FUNCTION switch

!• Built-in microphone

!ª Speaker

SAFETY CHECK-OUT

After correcting the original service problem, perform the follow-

ing safety check before releasing the set to the customer :

Checkthe antenna terminals,metal trim, “metallized”knobs, screws,

and all other exposed metal parts forAC leakage. Check leakage as

described below.

LEAKAGETEST

The AC leakage from any exposed metal part to earth ground and

from all exposed metal parts to any exposed metal part having a

return to chassis, must not exceed 0.5mA (500 microampers).

Leakage current can be measured by any one of three methods.

1. Acommercial leakage tester, such as the Simpson 229 or RCA

WT-540A. Follow the manufacturers’ instructions to use these

instruments.

2. A battery-operated AC milliammeter. The Data Precision 245

digital multimeter is suitable for this job.

3. Measuring the voltagedrop acrossa resistor by means ofaVOM

or battery-operated AC voltmeter. The “limit” indication is

0.75V,so analog metersmust have anaccuratelow-voltage scale.

The Simpson 250 and Sanwa SH-63Trd are examples of a pas-

sive VOM that is suitable. Nearly all battery operated digital

multimeters that have a 2VAC range are suitable. (See Fig.A)

voltmeter

(0.75V)

To Exposed Metal

Parts on Set

Earth Ground

0.15 F

1.5kΩ

Fig. A. Using an AC voltmeter to check AC leakage.

– 4 –

SECTION 2

DISASSEMBLY

2-1. CABINET (REAR) REMOVAL

2-2. ISS SW BOARD, BATTERY CASE, BATTERY BOARD, POWER BOARD REMOVAL

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

zThe equipment can be removed using the following procedure.

ISS SW board , BATTERY CASE, BATTERY board, POWER board

Main board, TUN LED board, TACT SW board

Mechanism deck, DECK CONTROL board, VOLUME board

Cabinet (Rear) assy

Set Cabinet (Front) assy

AEP, UK model

H/P JACK board, DOOR EAR (PH),

BOX EAR (PH)

ANT1

Knob, TU

Cabinet (Front) assy

Cabinet (Rear) assy

2Screws (+BV 3X14)

Cabinet (Rear) assy

AEP, UK model

BATTERY board

ISS SW board

Battery cas

Cabinet (Rear) assy

Stoper, wire

3Screw

(+BV 3x10)

1Screws (+BV 3x10) 4Shaft, handle

6Shaft, handle

9Screw

(+BV 3x10)

Power board

Ver 1.1 2001.11

– 5 –

2-3. MAIN BOARD,TUN LED BOARD,TACT SW BOARD REMOVAL

Screws (+BV 3x10)

Cabinet (Front) assy

Main board

Chassis, TU

TACT SW board

TUN LED board

2-4. H/P JACK BOARD, DOOR EAR (PH), BOX EAR (PH) REMOVAL

H/P JACK board

Screw (+BV 3x10)

Screw

(+BV 3x10)

Box, ear(PH)

DOOR, ear(PH)

Cabinet (Front) assy

– 6 –

2-5. MECHANISM DECK, DECK CONTROL BOARD,VOLUME BOARD REMOVAL

DECK CONTROL board

Volume board

Screws (+BV 3x10)

Screws (+BV 3x10

)

Screw +BV (3x10)

Screws (+BV 3x10)

Knob (TONE SW)

Knob (VOL)

Cabinet (Front) assy

Mechanism deck

– 7 –

SECTION 3

DIAL POINTER SETTING

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

1Attach TU worm to tuner chassis.

2Attach needle, tighten needle spring using a bolt, then attach TU

LED board.

3Rotate TU worm until needle stops at the stopper shown in Fig. A.

4Mount PLATE BLIND and position it as shown in Fig. B.

5Attach the band knob. Make sure that the projected part of the

tuner chassis fits as shown in Fig. C (the arrow).

6Tighten idler gear, combine projected part of band knob and the

band slider so that they interlock, then mount to main board.

7Mount VR gear to main board, then turn in the direction of the

arrow until it stops.

8Fasten the TU gear to the TU chassis with the screw.

Screw (+P 2.6x5)

Retainer, Pointer

Fig. A

Fig. B

Fig. C

Worm, TU

Knob, ban

Plate, blind

Pointer

Chassis, TU

TUN LED board

Stopper

Screw (+BV 3x10)

Screws (+BV 3x10) Screw (+BV 3x10)

Screw (+B 2.6x5)

Gear, VR

Gear, idler

Gear, TU

Main board Slieder, band

Chassis, TU

– 8 –

SECTION 4

ADJUSTMENTS

4-1. MECHANICAL ADJUSTMENTS

PRECAUTION

1. Clean the following parts wit2h a denatured-alcohol-moistened

swab :record/playback head pinch roller

erase head rubber belts

capstan

2. Demagnetize the record/playback head with a head demagne-

tizer. (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-102C 20 – 55 g•cm

(0.28 – 0.76 oz•inch)

Forward CQ-102C 2 – 5 g•cm

Back Tension (0.028 – 0.069 oz•inch)

Fast Forward CQ-201B more than 50 g•cm

(more than 0.7 oz•inch)

Rewind CQ-201B more than 50 g•cm

(more than 0.7 oz•inch)

Tape Tension Measurement

Torque Meter Meter Reading

CQ-403A more than 70g

(more than 2.47 oz)

4-2. ELECTRICAL ADJUSTMENTS

TAPE RECORDER SECTION

FUNCTION switch : TAPE (RADIO OFF)

SLOW PLAYBACK switch : OFF

EASY LISTENING ADJUSTMENT switch : OFF

VOLUME : MIN

Standard Output Level

Output terminal Earphone Speaker

load impedance 32Ω3.2Ω

output signal level 0.25V (–10dB) 0.775V (0dB)

TestTape

Type Signal Used for

WS-48A 3kHz, 0dB Tape Speed Adjustment

0dB=0.775V

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 :

set

test tape

P-4-A100

(10kHz, -10dB) 32

Ω

level meter

J101 (Earphone jack)

adjustment screw

– 9 – – 11 –– 10 –

TUNER SECTION

AM Section

Function switch : RADIO

Band switch : AM (US model)

MW or LW (AEP, UK model)

Volume : MIN

FM Section

Function switch : RADIO

Band switch : FM

Volume : MIN

• Repeat the procedures in each adjustment several times, and the

frequency coverage and tracking adjustments should be finally

done by the trimmer capacitors. ( ) : AEP, UK only

AM IF ALIGNMENT

Adjust for a maximum reading on level meter.

T1 455kHz

AM (MW) FREQUENCY COVERAGE ADJUSTMENT

Adjust for a maximum reading on level meter.

L3 520kHz

CT1 – 2 1,780kHz (1,680kHz)

AM (MW) TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L6 (L6 – 1) 620kHz

CT1 – 1 1,400kHz

Tape Speed Adjustment

Procedure :

1. Mode : Playback (Normal Speed)

2. Adjust RV103 so becomes the adjustment value below.

3. Set to slow playback switch (S105) ON mode.

Confirm that the become adjustment value as to follows.

Adjustment Value :

Speed checker Digital frequency counter

–1 to +1% 2,970 – 3,030Hz

Frequency difference between the beginning and the end of the tape

should be within 1.5% (45Hz).

Adjustment Location :

set

test tape

WS-48B

(3kHz, 0dB) 32

Ω

speed checker

LFM-30 or

digital frequenc

counter

J101 (Earphone jack)

[DECK CONTROL BOARD]

(Component side)

RV103 : Tape speed Adjustmen

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

Ω

J101 (Earphone jack)

level mete

FM RF signal

generator

22.5kHz frequency deviation by

400Hz signal.

Output level : as low as possible

telescopi

antenna

terminal

0.01

set

Ω

J101 (Earphone jack)

level mete

rCIRCUIT BOARDS LOCATION

MAIN board

BATTERY board

DECK CONTROL board

TACT SW board

H/P JACK board

TUN LED board

POWER board

VOLUME board

ISS SW board

(AEP, UK model)

FM FREQUENCY COVERAGE ADJUSTMENT

Adjust for a maximum reading on level meter.

L2 86.5MHz (87MHz)

CT1 – 4 109.5MHz (108.30MHz)

FM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L1 86.5MHz (87MHz)

CT1 – 3 109.5MHz (108.30MHz)

AEP, UK model

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.

L6 – 2 145kHz

CT5 300kHz

Adjustment Location : MAIN board (Component side)

[MAIN BOARD] (Component side)

CT1–3 : FM Tracking Adjustment

CT1–1 : MW Tracking Adjustment

CT5 : LW Tracking Adjustment

L6–2: LW Tracking Adjustment

L6–1: MW Tracking Adjustment

T1 : AM IF Alignment

L2 : FM Frequency Coverage Adjustment

CT1–2 : MW Frequency Coverage Adjustment

CT1–4 : FM Frequency

Coverage Adjustment

L3 : MW Frequency Coverage Adjustment

CT6 : LW Frequency

Coverage Adjustment

L4 : LW Frequency

Coverage Adjustment

L1 : FM Tracking Adjustment

[MAIN BOARD] (Component side)

CT1–3 : FM Tracking Adjustment

CT1–1 : AM Tracking Adjustment

L6 : AM Tracking Adjustment

T1 : AM IF Alignment

L2 : FM Frequency Coverage Adjustment

CT1–2 : AM Frequency Coverage Adjustment

CT1–4 : FM Frequency

Coverage Adjustment

L3 : AM Frequency Coverage Adjustment

L1 : FM Tracking Adjustment

AEP, UK model

US model

SECTION 5

DIAGRAMS

– 12 – – 14 –– 13 –

Note:

• 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 Ωand 1/4W or less unless otherwise

specified.

Note: The components identified by mark !or dotted

line with mark !are critical for safety.

Replace only with part number specified.

•U: B+ Line.

•H: adjustment for repair.

• Power voltage is dc 6 V and fed with regulated dc power

supply from external power voltage jack.

5-1. SCHEMATIC DIAGRAM (AEP,UK MODEL) rRefer to page 26 for IC Block Diagrams.

CFM-A50

• Voltages and waveforms are dc with respect to ground

under no-signal (detuned) conditions.

no mark : FM

( ) : MW, LW

• Voltagesaretaken with aVOM(Inputimpedance 10 MΩ).

Voltage variations may be noted due to normal produc-

tion tolerances.

• Signal path.

F: FM

E: PB

a: REC

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