Sony XR-4758-RDS Service manual

XR-4758RDS/4759RDS

UK Model

SERVICE MANUAL

Photo: XR-4759RDS

Model Name Using Similar Mechanism XR-3740
T ape Transport Mechanism T ype

MG-52A-135

SPECIFICATIONS

MICROFILM

FM/MW/LW CASSETTE CAR STEREO

TABLE OF CONTENTS

SERVICING NOTES

1. GENERAL

Location of Controls........................................................ 3

2. DISASSEMBLY ......................................................... 4

3. ASSEMBLY OF MECHANISM DECK ........... 6

4. MECHANICAL ADJUSTMENTS ....................... 12

5. ELECTRICAL ADJUSTMENTS

Test Mode ........................................................................12

Tape Deck Section ........................................................... 13

Tuner Section...................................................................13

6. DIAGRAMS

6-1. IC Pin Function Description............................................ 16

6-2. Printed Wiring Boards – MAIN Section – ..................... 18

6-3. Schematic Diagram – MAIN Section –........................... 21

6-4. Printed Wiring Board – KEY Section – ......................... 27

6-5. Schematic Diagram – KEY Section – ............................ 29

7. EXPLODED VIEWS ................................................ 34

8. ELECTRICAL PARTS LIST................................ 38

Flexible Circuit Board Repairing

• Keep the temperature of the soldering iron around 270 ˚C dur-

ing repairing.

• Do not touch the soldering iron on the same conductor of the

circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering

or unsoldering .

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

– 2 –

SECTION 1

GENERAL

This section is extracted
from instruction manual.

– 3 –

SECTION 2

DISASSEMBLY

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

FRONT PANEL ASS’Y

1

Push the button
(release).

A

2

Remove the front panel ass’y
to the direction of the arrow A.

COVER ASS’Y

1

2

3

cover ass’y

2

1

– 4 –

SUB PANEL, MECHANISM DECK (MG-52A-135)

3

connector
(CN352)

2

sub panel

5

screw
(PTT2.6 × 6)

6

mechanism deck
(MG-52A-135)

4

flexible flat cable
(CN351)

1

three screws
(PTT2.6 × 6)

1

three screws
(PTT2.6 × 6)

MAIN BOARD, HEAT SINK

2

two ground point
screws

3

main board

4

six screws
(PTT2.6 × 8)

1

screw
(PTT2.6 × 6)

– 5 –

1

two screws
(PTT2.6 × 6)

SECTION 3

ASSEMBLY OF MECHANISM DECK

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

ALIGNMENT OF FRONT SWITCH

hole

1

Align ¢ mark on the rotary switch
the position shown in the figure.

chassis (S) ass’y

GEAR (LDGE)

1

Align hole as shown in the figure.

2

Align hole in the gear (LDG-D) with the
position shown in the figure.

2

Install the gear (LDG-E).

– 6 –

CHASSIS (S) ASS’Y

2

screw (PS2 × 4)

2

screw (PS2 × 4)

1

chassis (S) ass’y

LEVER (MODE)

1. Align ¢ mark on the rotary switch with
hole in the lever (mode).

2. Fit on positions A, B and C and install
the lever (mode).

rotary switch

A

lever (mode)

C

¢

mark on rotary switch

hole in lever (mode)

B

– 7 –

LEVER (PINCH SELECTION)

1

Align.

2

lever (pich selection)

HEAD PLATE ASS’Y

5

step screw (HP)

2

Fit shaft in groove.

ATS lever

5

1

Fit in groove.

step screw (HP)

3

Press the ATS lever.

4

Position the head plate sub
ass’y as shown in the figure.

– 8 –

groove

LEVER (PINCH) ASS’Y

2

two polyethylene washers

1

Fit shaft of the lever (Pinch) ass’y
in hole on the chassis (M) ass’y and
install the lever (pinch) ass’y.

B

shaft

B

C

shaft

C

shaft

A

HOUSING

4

Fit claw on B part.

3

2

Install the hanger on to
two claws of the housing.

Put the housing
under A part.

5

Fit projections on C part.

C

part

3

Install the spring (pinch press) to shaft A.
Set the ends of spring to B and C.

7

Holder the hanger by bending the claw.

1

Install the catch to the hanger.

hanger

6

Fit projections on D part.

8

Holder the hanger by
bending the claw.

A

part

B

part

– 9 –

D

part

ARM (SUCTION)

2

Move the arm (suction) in the arrow
direction and fit on projection.

projection

1

Fit the arm (suction) on the shaft.

LEVER (LDG-A) / (LDG-B)

shaft

A

shaft

1

Fit the lever (LDG-A)
on shaft A – C and install it.

B

shaft

C

3

two type-E stop ring 2.0

shaft

A

shaft

2

Fit the lever (LDG-B)
on shafts A and B and
install.

B

– 10 –

GEAR (LDG-FT)

hole

gear (LDG-D)

1

gear (LDG-A)

6

polyethylene washer

5

gear (LDG-FT)

2

3

Move the lever (LDG-B)
in the arrow direction.

tension spring (lever LDG)

4

GUIDE (C)

gear (LDG-A)

gear (LDG-FB)

Align hole in the gear (LDG-D) with

¢

mark on the lever (LDG-A).

1

three claws

2

guide (C)

– 11 –