Sony XR-1780 E Model User manual

MICROFILM

SERVICE MANUAL

FM/MW/SW CASSETTE CAR STEREO

E Model

SPECIFICATIONS

XR-1780

Model Name Using Similar Mechanism XR-1790

Tape Transport Mechanism Type MG-36SZ9-32

– 2 –

TABLE OF CONTENTS

1. GENERAL

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

Setting the Clock ............................................................. 3

Installation....................................................................... 4

Connections ..................................................................... 6

2. DISASSEMBLY ......................................................... 8

3. MECHANICAL ADJUSTMENTS....................... 12

4. ELECTRICAL ADJUSTMENTS

Tape Deck Section .......................................................... 12

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

5. DIAGRAMS

5-1. Notes for Printed Wiring Board and

Schematic Diagram ......................................................... 16

5-2. Printed Wiring Board – MAIN Board – ........................ 17

5-3. Schematic Diagram – MAIN Board (1/2) – ................... 19

5-4. Schematic Diagram – MAIN Board (2/2) – ................... 21

5-5. Printed Wiring Board – CONTROL Board – ................ 23

5-6. Schematic Diagram – CONTROL Board – ................... 23

5-7. IC Pin Function Description ........................................... 26

6. EXPLODED VIEWS................................................ 28

7. ELECTRICAL PARTS LIST ............................... 34

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.

– 3 –

SECTION 1

GENERAL This section is extracted from

instruction manual.

– 4 –

– 5 –

– 6 –

– 7 –

– 8 –

FRONT PANEL ASS’Y

MECHANISM DECK SECTION (MG-36SZ9-32)

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

SECTION 2

DISASSEMBLY

3

top cover

4

three claws

5

front panel ass’y

4

two claws

2

two screws

(PTT2.6

1

connector

(CN901)

2

two screws

(PTT2.6

3

mechanism deck section

(MG-36SZ9-32)

– 9 –

MAIN BOARD, HEAT SINK

BRACKET (MD)

4

five screws

(PTT2.6

1

two screws

(PTT2.6

5

heat sink

2

two screws

(ground point)

3

MAIN board

1

two screws

(P2.6

1

two screws

(P2.6

2

bracket (MD

)

– 10 –

MOTOR ASS’Y (CAPSTAN/REEL) (M901)

CASSETTE HANGER (X)

1

two screws

(P2

4

motor ass’y (CAPSTAN/REEL

)

(M901)

3

main belt

2

sub belt

Remove the claw toward

direction.

Remove the return link

toward direction.

cassette hanger (x)

boss

two claws

Remove the claw toward

direction.

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