Jvc FSSD 770 R Service Manual
This is the 31 pages manual for Jvc FSSD 770 R Service Manual.
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Extracted text from Jvc FSSD 770 R Service Manual (Ocr-read)
Page 1
FS-SD550R/FS-SD770R/FS-SD990R 1-2 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 manufacturer`s 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 re-assembling. 5. Leakage currnet check (Electrical shock hazard testing) After re-assembling 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, 1,000 ohms per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15 F AC-type capacitor between an exposed metal part and a known good earth ground. Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to eachexposed metal part, particularly any exposed metal part having a return path to the chassis, and meausre 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. 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. 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 ! 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.
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FS-SD550R/FS-SD770R/FS-SD990R 1-3 Important for laser products 1.CLASS 1 LASER PRODUCT 2.DANGER : Invisible laser radiation when open and inter lock failed or defeated. Avoid direct exposure to beam. 3.CAUTION : There are no serviceable parts inside the Laser Unit. Do not disassemble the Laser Unit. Replace the complete Laser Unit if it malfunctions. 4.CAUTION : The compact disc player uses invisible laser radiation and is equipped with safety switches which prevent emission of radiation when the drawer is open and the safety interlocks have failed or are defeated. It is dangerous to defeat the safety switches.5.CAUTION : If safety switches malfunction, the laser is able to function. 6.CAUTION : Use of controls, adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure. VARNING : Osynlig laserstrålning är denna del är öppnad och spårren är urkopplad. Betrakta ej strålen. VARO : Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättömälle lasersäteilylle.Älä katso säteeseen.ADVARSEL : Usynlig laserstråling ved åbning , når sikkerhedsafbrydere er ude af funktion. Undgå udsættelse for stråling. ADVARSEL : Usynlig laserstråling ved åpning,når sikkerhetsbryteren er avslott. unngå utsettelse for stråling. REPRODUCTION AND POSITION OF LABELS WARNING LABEL DANGER : Invisible laser radiation when open and interlock or defeated. AVOID DIRECT EXPOSURE TO BEAM (e) VARNING : Osynlig laserstrålning är denna del är öppnad och spårren är urkopplad. Betrakta ej strålen. (s) VARO : Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättömälle lasersäteilylle.Älä katso säteeseen. (d) ADVARSEL :Usynlig laserstråling ved åbning , når sikkerhedsafbrydere er ude af funktion. Undgå udsættelse for stråling. (f) CLASS 1 LASER PRODUCT ! CAUTIONPlease use enough caution not to see the beam directly or touch it in case of an adjustment or operation check.
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FS-SD550R/FS-SD770R/FS-SD990R 1-29 Symbol Lch OUT VCO LPF2 LPF1 MPX IN AM OUT FM OUT FM QUAD AM IF IN Vst AM MIX OUT FM IF IN Symbol AM RF AM S.SENS FM S.SENS AM OSC AM OSC OUT VCC AGC GND IF OUT TU IND ST IND Rch OUT Pin No. 1 2 3 4 5 6 7 8 9 10 11 12Pin No. 13 14 15 16 17 18 19 20 21 22 23 24 I/O I - O - I - O O O OI/O O O O O I O O I I - O I AMRF signal input AM local oscillation circuit AM local oscillation signal output Power supply AGC voltage input terminal Connect to GND IF REQ signal output to IC2 Indicator drive output when tuning Stereo indicator output "H"mono . "L"stereo Output RchOutput Lch Voltage controlled terminal When voltage of terminal is MONO at "H" and ST at "L" When voltage of terminal is AM at "H" and FM at "L" Multi plex signal input AM detection signal output FM detection signal output Bypass to FMIF Input of AMIF signal Fixed voltage output terminal Output terminal for AM mixer Input of FMIF signal Function Function 2.Pin Function 1.Block Diagrams 24 23 22 21 20 19 18 17 16 15 14 13 123456789 1110 12 FM IF IN AM RF INAM OSCAM OSC OUTVcc AGC GND IF OUT /REQTUN LEDST LEDR OUT AM S.SENSFM S.SENSAM IF IN AM MIX OUT Vstb QUAD FM OUT AM OUT MPX IN LPF 1 LPF 2 VCO L OUT REG AGCMUTE VCO DIVIDE DECODE FM DET FM IF AM IF IF BUFF BUFF AM MIXAM OSCAM DETLEVEL SW AM/FM MONO SW TUN LED ST LED IF REQ SWAM TA2057N (IC1) : FM/AM IF AMP & Detector