Sony XRC-353 Service manual

XR-3753/C353

SERVICE MANUAL

East European Model

For RM-X2S (Remote Commander), please refer to RM-X2S/X3S Service Manual (9-960-039-∏) previously issued.

Cassette player section

Tape track 4-track 2-channel stereo Wow and flutter 0.08 % (WRMS) Frequency response 30 – 20,000 Hz Signal-to-noise ratio 58 dB

Tuner section

Turning range 65.0 – 74.0 MHz

(at 30 kHz step)

87.5 – 108.0 MHz

(at 50 kHz step) Aerial terminal External aerial connector Intermediate frequency 10.7 MHz Usable sensitivity 8 dBf Selectivity 75 dB at 400 kHz Signal-to-noise ratio 65 dB (stereo),

68 dB (mono) Harmonic distortion at 1 kHz

0.5 % (stereo),

0.3 % (mono) Separation 35 dB at 1 kHz Frequency response 30 – 15,000 Hz Capture ratio 2 dB

Photo: XR-3753

SPECIFICATIONS

General

Outputs Power aerial control lead

Tone controls Bass ± 8 dB at 100 Hz

Power requirements 12 V DC car battery Dimensions Approx. 188 × 58 × 181 mm (w/h/d)

Mounting dimensions Approx. 182 × 53 × 164 mm (w/h/d) Mass Approx. 1.2 kg Supplied accessories Parts for installation and connections (1 set)

Design and specifications are subject to change without notice.

Model Name Using Similar Mechanism NEW T ape Transport Mechanism T ype

Power amplifier control lead (XR-C353 only) Telephone mute control lead (XR-C353 only) Line out (XR-C353 only)

Treble ± 8 dB at 10 kHz

(negative ground)

Front panel case (1) Rotary commander RM-X2S

MG-25A-136

MW/LW

Tuning range MW: 531 – 1,602 kHz

LW: 153 – 281 kHz Aerial terminal External aerial connector Intermediate frequency 10.71 MHz/450 kHz Sensitivity MW: 30 µV

LW: 50 µV

Power amplifier section

Outputs Speaker outputs

(sure seal connectors) Speaker impedance 4 – 8 ohms Maximum power output 35 W × 4 (at 4 ohms)

MICROFILM

FM/MW/LW CASSETTE CAR STEREO

TABLE OF CONTENTS

SERVICING NOTES

1. GENERAL

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

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

Using the Rotary Remote ................................................ 3

Adjusting the Sound Characteristics ............................... 4

Muting the Sound ............................................................ 4

Changing the Sound and Beep Tone................................ 4

Installation ....................................................................... 5

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

2. DISASSEMBLY.......................................................... 9

3. ASSEMBLY OF MECHANISM DECK............. 11

4. MECHANICAL ADJUSTMENTS ....................... 14

5. ELECTRICAL ADJUSTMENTS

Test Mode ........................................................................ 14

Tape Deck Section ........................................................... 14

Tuner Section................................................................... 15

6. DIAGRAMS

6-1. Printed Wiring Board –Main Section– ........................... 21

6-2. Schematic Diagram –Main Section– .............................. 23

6-3. Printed Wiring Board –Panel Section–........................... 27

6-4. Schematic Diagram –Panel Section–.............................. 29

6-5. IC Pin Function Description ............................................ 31

Flexible Circuit Board Repairing

• K eep the temperature of the soldering iron around 270 ˚C during

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.

7. EXPLODED VIEWS ................................................ 33

8. ELECTRICAL PARTS LIST................................ 36

– 2 –

SECTION 1

GENERAL

This section is extracted from instruction manual.

– 3 –

– 4 –

– 5 –

– 6 –

– 7 –

– 8 –

SECTION 2

DISASSEMBLY

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

FRONT PANEL ASS’Y

Push the button (release).

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

COVER ASS’Y

cover ass’y

– 9 –

SUB PANEL, MECHANISM DECK (MG-25A-136)

connector (CN302)

sub panel

three screws (PTT2.6 × 8)

screw (PTT2.6 × 6)

mechanism deck (MG-25A-136)

flexible flat cable (CN301)

three screws (PTT2.6 × 8)

MAIN BOARD, HEAT SINK

two ground point screws

main board

eight screws (PTT2.6 × 10)

heat sink

screw (PTT2.6 × 8)

– 10 –

two screws (PTT2.6 × 8)

SECTION 3

ASSEMBLY OF MECHANISM DECK

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

HOUSING

Fit claw on B part.

Install the hanger onto two claws of the housing.

Put the housing under A part.

housing

part

Fit projection on C part.

part

Holder the hanger by bending the claw.

Install the catch to the hanger.

hanger

Fit projection on D part.

Hold the hanger by bending the claw.

part

ARM (SUCTION)

projection

part

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

Fit the arm (suction) on the shaft.

– 11 –

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

shaft

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

shaft

type-E stop ring 2.0

shaft

Pull the lever in the arrow direction.

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

GEAR (LDG-FT)

hole

gear (LDG-D)

lever (LDG-A)

gear (LDG-FB)

gear (LDG-FT)

polyethyene washer

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

tension spring (lever LDG)

Align hole in the gear (LDG-D) with hole the lever (LDG-A).

– 12 –

GUIDE (C)

three claws

guide (C)

– 13 –

SECTION 4

MECHANICAL ADJUSTMENTS

SECTION 5

ELECTRICAL ADJUSTMENTS

1. Clean the following parts with a denatured-alcohol-moistene swab:

playback head pinch roller rubber belt capstan idlers

2. Demagnetize the playback head with a head demagnetizer.

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 power supply voltage unless otherwise noted.

• T orque Measurement

Mode Torqu Meter Meter Reading

Forward CQ-102C Forward

Back Tension (0.01 – 0.06 oz•inch) Reverse CQ-102RC Reverse

Back Tension (0.01 – 0.06 oz•inch) FF, REW CQ-201B

CQ-102C

CA-102RC

30 – 65 g•cm

(0.42 – 0.90 oz•inch)

0.5 – 4.5 g•cm

30 – 65 g•cm

(0.42 – 0.90 oz•inch)

0.5 – 4.5 g•cm

60 – 200 g•cm

(0.83 – 2.78 oz•inch)

TEST MODE

This set have the test mode function. In the test mode, FM Auto Scan/Stop Level and AM (MW) Auto Scan/Stop Level adjustments can be performed easier than it in ordinary procedure.

1. Set the “power select” switch (S501) is “A” position.

2. Turn ON the regulated power supply. (All LEDs on the set lights up, and the clock is displayed.) Note: Press the OFF button, if the clock is not displayed.

3. Push the preset 4 button.

4. Push the preset 5 button.

5. Press the preset 1 button for more than two seconds.

6. Then the display indicates all lights, the test mode is set.

1. Push the OFF button.

2. Return the “power select” switch (S501) to initially aet position.

See the adjustment location from on page 17 for the adjustment.

0 dB=0.775 VTAPE DECK SECTION

• T ape Tension Measurement

Mode Tension Meter Meter Reading

Forward CQ-403A

Reverse CQ-403R

(more than 3.18 oz)

more than 90 g

Tape Speed Adjustment

Procedure:

1. Put the set into the FWD PB mode.

speed checker

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

set

speaker out terminal

Specification: Constant speed

Speed checker Frequency counter

–1.5 to +2.5% 2,955 to 3,075 Hz

Adjustment Location: See page 17.

frequency counte

Ω

+–

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