JVC RX-6042-S Service manual

SERVICE MANUAL

AUDIO/VIDEO CONTROL RECEIVER

MB16720043

RX-6042S

Area suffix

E ----------- Continental Europe EN ------------ Northern Europe EV -------------- Eastern Europe

TA/NEWS/INFO

DISPLAY MODE

TABLE OF CONTENTS

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

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14

No.MB167

2004/3

SPECIFICATION

Amplifier

Output Power

At Stereo operation Front channels 100 W per channel, min. RMS, driven into 8 Ω, 40 Hz to 20 kHz with

no more than 0.8% total harmonic distortion.

At Surround operation Front channels 100 W per channel, min. RMS, driven into 8 Ω, at 1 kHz with no more

than 0.8% total harmonic distortion.

Center channel 100 W, min. RMS, driven into 8 Ω, at 1 kHz with no more than 0.8%

total harmonic distortion.

Surround channels 100 W per channel, min. RMS, driven into 8 Ω, at 1 kHz with no more

than 0.8% total harmonic distortion.

Audio

Audio Input Sensitivity/Impedance (1 kHz) CD, TAPE/CDR, VCR, TV SOUND, DVD:220 mV/47 kΩ Audio Input (DIGITAL IN)* Coaxial DIGITAL 1 (DVD):0.5 V(p-p)/75 Ω

Optical DIGITAL 2 (CD), DIGITAL 3 (TV):-21 dBm to -15 dBm (660 nm ±30

nm)

* Corresponding to Linear PCM, Dolby Digital, and DTS Digital Surround (with sampling frequency-32 kHz, 44.1 kHz, 48 kHz)

Recording Output Level TAPE/CDR, VCR:220 mV

Signal-to-Noise Ratio ('66 IHF/'78 IHF) CD, TAPE/CDR, VCR, TV SOUND, DVD:87 dB/74 dB

Frequency Response (8 Ω) CD, TAPE/CDR, VCR, TV SOUND, DVD:20 Hz to 50 kHz (+1 dB, -3 dB)

Bass Boost +3 dB ±1 dB at 100 Hz

Equalization (5 bands) 63 Hz, 250 Hz, 1 kHz, 4 kHz, 16 kHz(±8 dB in 2 dB steps)

Video

Video Input Sensitivity/Impedance Composite video:DVD, VCR 1 V(p-p)/75 Ω

S-video:DVD, VCR (Y: luminance):1 V(p-p)/75 Ω

(C: chrominance, burst):0.286 V(p-p)/75 Ω

Component:DVD, VCR (Y: luminance):1 V(p-p)/75 Ω

(PB, PR):0.7 V(p-p)/75 Ω

Video Output Level Composite video:VCR, MONITOR OUT 1 V(p-p)/75 Ω

S-video:VCR, MONITOR OUT (Y: luminance):1 V(p-p)/75 Ω

(C: chrominance, burst):0.286 V(p-p)/75 Ω

Component:MONITOR OUT (Y: luminance):1 V(p-p)/75 Ω

(PB, PR):0.7 V(p-p)/75 Ω

Synchronization Negative

Signal-to-Noise Ratio 45 dB

FM tuner (IHF)

Tuning Range 87,50 MHz - 108,00 MHz

Usable Sensitivity Monaural:17,0 dBf (1,9 µV/75 Ω) 50 dB Quieting Sensitivity Monaural:21,3 dBf (3,2 µV/75 Ω)

Stereo:41,3 dBf (31,8 µV/75 Ω)

Stereo Separation at OUT (REC) 35 dB at 1 kHz

AM tuner

Tuning Range 522 kHz to 1 629 kHz

General

Power Requirements AC 230V , 50 Hz

Power Consumption 200 W, 2 W (in standby mode)

Dimensions (W × H × D) 435 mm × 146.5 mm × 409.5 mm

Mass 8.8 kg

Designs and specifications are subject to change without notice.

1-2 (No.MB167)

SECTION 1

PRECAUTION

1.1 Safety Precautions

(1) This design of this product contains special hardware and

many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Services should be performed by qualified personnel only.

(2) Alterations of the design or circuitry of the product should

not be made. Any design alterations of the product should not be made. Any design alterations or additions will void the manufacturers warranty and will further relieve the manufacture of responsibility for personal injury or property damage resulting therefrom.

(3) Many electrical and mechanical parts in the products have

special safety-related characteristics. These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in the Parts List of Service Manual. Electrical components having such features are identified by shading on the schematics and by ( ) on the Parts List in the Service Manual. The use of a substitute replacement which does not have the same safety characteristics as the recommended replacement parts shown in the Parts List of Service Manual may create shock, fire, or other hazards.

(4) The leads in the products are routed and dressed with ties,

clamps, tubings, barriers and the like to be separated from live parts, high temperature parts, moving parts and/or sharp edges for the prevention of electric shock and fire hazard. When service is required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to normal, after reassembling.

(5) Leakage shock hazard testing

After reassembling the product, always perform an isolation check on the exposed metal parts of the product (antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electrical shock.Do not use a line isolation transformer during this check.

• Plug the AC line cord directly into the AC outlet. Using a "Leakage Current Tester", measure the leakage current from each exposed metal parts of the cabinet, particularly any exposed metal part having a return path to the chassis, to a known good earth ground. Any leakage current must not exceed 0.5mA AC (r.m.s.).

• Alternate check method Plug the AC line cord directly into the AC outlet. Use an

AC voltmeter having, 1,000Ω per volt or more sensitivity in the following manner. Connect a 1,500Ω 10W resistor paralleled by a 0.15µF AC-type capacitor between an ex-

posed metal part and a known good earth ground. Measure the AC voltage across the resistor with the AC

voltmeter. Move the resistor connection to each exposed metal part, particularly any exposed metal part having a return path to the chassis, and measure the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. Voltage measured any must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.).

AC VOLTMETER (Having 1000 ohms/volts, or more sensitivity)

0.15 F AC TYPE

Place this probe on

1500 10W

Good earth ground

1.2 Warning

(1) This equipment has been designed and manufactured to

meet international safety standards.

(2) It is the legal responsibility of the repairer to ensure that

these safety standards are maintained.

(3) Repairs must be made in accordance with the relevant

safety standards.

(4) It is essential that safety critical components are replaced

by approved parts.

(5) If mains voltage selector is provided, check setting for local

voltage.

1.3 Caution

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.

1.4 Critical parts for safety

In regard with component parts appearing on the silk-screen printed side (parts side) of the PWB diagrams, the parts that are printed over with black such as the resistor ( ), diode ( ) and ICP ( ) or identified by the " " mark nearby are critical for safety. When replacing them, be sure to use the parts of the same type and rating as specified by the manufacturer. (This regulation dose not Except the J and C version)

each exposed metal part.

(No.MB167)1-3

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

1-4 (No.MB167)

SECTION 3

DISASSEMBLY

3.1 Removing the top cover (See Fig.1)

(1) From the right and left sides of the main body, remove the

four screws A attaching the top cover.

(2) From the back side of the main body, remove the three

screws B attaching the top cover.

(3) Remove the top cover in the direction of the arrow 2 while

extending the lower sections of the top cover in the direction of the arrow 1.

Top cover

3.2 Removing the front panel assembly (See Figs.2 and 3)

• Prior to performing the following procedure, remove the top

cover. (1) Disconnect the card wire from the connector CN402

audio board. (See Fig.2)

(2) Disconnect the card wire from the connector CN201

power supply board. (See Fig.2)

(3) Remove the tie bands. (See Fig.2) (4) Remove the wire protection board fixing the card wire. (See

Fig.2)

(5) Disconnect the wire from the connector CN403

board. (See Fig.2)

(6) Remove the three screws C attaching the front panel

assembly. (See Fig.2)

(7) From the bottom side of the main body, remove the four

screws D attaching the front panel assembly. (See Fig.3)

(8) Remove the front panel assembly in the direction of the

arrow. (See Fig.3)

on the

on audio

Tie band

Wire protection board

Card wire

Tie band

CN402

Audio board

Fig.1

Front panel assembly

C C C

CN403

Fig.2

Front panel assembly

Card wire

Power supply board

CN201

Fig.3

(No.MB167)1-5

+ 11 hidden pages