Jvc RX 6042 S Service Manual 2
This is the 16 pages manual for Jvc RX 6042 S Service Manual 2.
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Extracted text from Jvc RX 6042 S Service Manual 2 (Ocr-read)
Page 1
1-2 (No.MB167) SPECIFICATION Designs and specifications are subject to change without notice.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
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(No.MB167)1-3 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 ACvoltmeter. 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.). 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) Good earth groundPlace this probe on each exposed metal part. AC VOLTMETER (Having 1000 ohms/volts, or more sensitivity) 1500 10W 0.15 F AC TYPE
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1-12 (No.MB167) 3.16 Removing the system control board and power switch board (See Figs.18 and 19) - Prior to performing the following procedure, remove the top cover and front panel assembly. (1) Pull out the volume and jog knobs from the front side of the front panel assembly, remove the nut attaching the system control board. (See Fig.18) (2) From the back side of the front panel assembly, remove the nine screws X attaching the system control board. (See Fig.19) (3) Remove the solders of the soldered section j on the system control board and disconnect the parallel wire. (See Fig.19) (4) Remove the two screws Y attaching the power switch board. (See Fig.19) Fig.18 Fig.19 Nut Volume knob Front panel assembly Jog knob X XX Y Soldered section j Power switch board System control board Parallel wire Front panel assembly