JVC KD-S71R, KD-S73R Service Manual

SERVICE MANUAL

CD RECEIVER

49780B20053

KD-S73R,KD-S71R

Area suffix

E ------------- Southern Europe EX ------------ Northern Europe

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26

No.49780B

2005/3

SPECIFICATION

AUDIO AMPLIFIER SECTION

Maximum Power Output Front 45 W per channel

Rear 45 W per channel

Continuous Power Output (RMS) Front 17 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more

than 0.8% total harmonic distortion.

Rear 17 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more

than 0.8% total harmonic distortion.

Load Impedance 4 Ω (4 Ω to 8 Ω allowance)

Tone Control Range Bass ±10 dB at 100 Hz

Treble ±10 dB at 10 kHz

Frequency Response 40 Hz to 20 000 Hz

Signal-to-Noise Ratio 70 dB

Line-Out Level/Impedance 2.0 V/20 kΩ load (full scale) Output Impedance 1 kΩ

TUNER SECTION

Frequency Range FM 87.5 MHz to 108.0 MHz

AM (MW) 522 kHz to 1 620 kHz

(LW) 144 kHz to 279 kHz

FM Tuner Usable Sensitivity 11.3 dBf (1.0 µV/75 Ω)

50 dB Quieting Sensitivity 16.3 dBf (1.8 µV/75 Ω)

Alternate Channel Selectivity (400 kHz) 65 dB

Frequency Response 40 Hz to 15 000 Hz

Stereo Separation 30 dB

Capture Ratio 1.5 dB

MW Tuner Sensitivity 20 µV

Selectivity 35 dB

LW Tuner Sensitivity 50 µV

CD PLAYER SECTION

Type Compact disc player

Signal Detection System Non-contact optical pickup (semiconductor laser)

Number of channels 2 channels (stereo)

Frequency Response 5 Hz to 20 000 Hz

Dynamic Range 96 dB

Signal-to-Noise Ratio 98 dB

Wow and Flutter Less than measurable limit

GENERAL

Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)

Grounding System Negative ground

Allowable Operating Temperature 0°C to +40°C Dimensions (W × H × D) Installation Size (approx.) 182 mm × 52 mm × 150 mm

Panel Size (approx.) 188 mm × 58 mm × 11 mm

Mass (approx.) 1.3 kg (excluding accessories)

Design and specifications are subject to change without notice.

1-2 (No.49780B)

1.1 Safety Precautions

SECTION 1

PRECAUTIONS

Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system.

Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check.

(No.49780B)1-3

1.2 Preventing static electricity

Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.

1.2.1 Grounding to prevent damage by static electricity

Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as DVD players. Be careful to use proper grounding in the area where repairs are being performed.

(1) Ground the workbench

Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the traverse unit (optical pickup) on it.

(2) Ground yourself

Use an anti-static wrist strap to release any static electricity built up in your body.

(caption) Anti-static wrist strap

Conductive material (conductive sheet) or iron plate

(3) Handling the optical pickup

• In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical pickup are shorted. After replacement, return the shorted parts to their original condition. (Refer to the text.)

• Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easily destroy the laser diode.

1.3 Handling the traverse unit (optical pickup)

(1) Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit. (2) Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to the

replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long

a time when attaching it to the connector. (3) Handle the flexible cable carefully as it may break when subjected to strong force. (4) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.

1.4 Attention when traverse unit is decomposed

*Please refer to "Disassembly method" in the text for the CD pickup unit.

• Apply solder to the short land before the flexible wire is disconnected from the connector on the CD pickup unit. (If the flexible wire is disconnected without applying solder, the CDpickup may be destroyed by static electricity.)

• In the assembly, be sure to remove solder from the short land after connecting the flexible wire.

Short-circuit point

(Soldering)

Flexible wire

1-4 (No.49780B)

Short-circuit point

Pickup

2.1 HOW TO IDENTIFY MODELS

2.1.1 NAME PLATE

Discernment sign (as same as KD-S73R )

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

(No.49780B)1-5

SECTION 3

DISASSEMBLY

3.1 Main body

3.1.1 Removing the front panel assembly

(See Fig.1)

(1) Push the detach button in the lower right part of the front

panel assembly and remove the front panel assembly in the direction of the arrow.

3.1.2 Removing the front chassis assembly

(See Figs.2 and 3)

• Prior to performing the following procedure, remove the front panel assembly. (1) Remove the screw A on the both sides of the main body. (2) Release the two joints a and two joints b on both sides of

the main body using a screwdriver, and remove the front chassis assembly forward.

Front panel assembly

Detach button

Fig.1

Joint a

Joint b

Front chassis assembly

Joint a

Front chassis assembly

Fig.2

Fig.3

1-6 (No.49780B)

3.1.3 Removing the heat sink (See Fig.4)

(1) Remove the two screws B and two screws C on the left

side of the main body.

3.1.4 Removing the bottom cover (See Figs.5 and 6)

• Prior to performing the following procedure, remove the front

panel assembly, front chassis assembly and heat sink. (1) Turn over the body and release the two joints c, two joints

d and joint e.

CAUTION:

Do not damage the main board when releasing the joint e using a screwdriver. (See Figs.5 and 6)

Joint c

Joint e

Heat sink

Fig.4

Bottom cover

Joint d

Fig.5

Joint d

Bottom cover

3.1.5 Removing the rear bracket (See Fig.7)

• Prior to performing the following procedure, remove the front

panel assembly, front chassis assembly, heat sink and bottom cover. (1) Remove the three screws D, screw E and two screws F on

the back of the main body.

(2) Remove the rear bracket.

Reference:

During reassembly, before fixing the rear bracket onto the main body, insert the ST remote wire into the slot.

Joint e

Joint c

Fig.6

Rear bracket

Fig.7

Insert ST remote cable into the slot.

(No.49780B)1-7

3.1.6 Removing the main board (See Fig.8)

• Prior to performing the following procedure, remove the front

panel assembly, front chassis assembly, heat sink, bottom cover and rear bracket. (1) Remove the two screws G attaching the main board. (2) Disconnect the connector CN501 and remove the main

board.

3.1.7 Removing the CD mechanism assembly (See Fig.9)

• Prior to performing the following procedure, remove the front

panel assembly, front chassis assembly, heat sink, bottom cover, rear bracket and main board. (1) Remove the three screws H.

CN501

Main board

Fig.8

CD mechanism assembly

Top chassis

Fig.9

1-8 (No.49780B)

3.1.8 Removing the front board

(See Figs.10 to 12)

• Prior to performing the following procedure, remove the front

panel assembly. (1) Remove the four screws J on the back side of the front

panel assembly. (2) Release the eleven joints f. (3) Take out the front board.

Front panel

Joint f

Front board

Rear cover

Fig.10

Joint f

Joint

Joint f

Fig.11

Fig.12

(No.49780B)1-9

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