Jvc KDG 805 Service Manual
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Extracted text from Jvc KDG 805 Service Manual (Ocr-read)
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1-2 (No.MA055) SPECIFICATION Design and specifications are subject to change without notice.AUDIO AMPLIFIER SECTION Maximum Power Output Front 50 W per channel Rear 50 W per channel Continuous Power Output (RMS) Front 19 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more than 0.8% total harmonic distortion. Rear 19 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) Frequency Control Range Low ±12 dB (60 Hz, 80 Hz, 100 Hz, 120 Hz) Mid ±12 dB High ±12 dB (8 kHz, 10 kHz, 12 kHz, 15 kHz) Frequency Response 40 Hz to 20 000 Hz Signal-to-Noise Ratio 70 dB Line-Out Level/Impedance 5.0 V/20 kΩ load (full scale) Output Impedance 1 kΩ Subwoofer-Out Level/Impedance 2.0 V/20 kΩ load (full scale) TUNER SECTION Frequency Range FM 87.5 MHz to 108.0 MHz AM 531 kHz to 1 602 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 35 dB Capture Ratio 1.5 dB [AM Tuner] Sensitivity 20 µV Selectivity 35 dB 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 MP3 decoding format MPEG1/2 Audio Layer 3 Max. Bit Rate:192 Kbps GENERAL Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance) Grounding System Negative ground Allowable Operating Temperature 0ºC to +40ºC Dimensions (W × H × D) Installation Size (approx.) 182 mm × 52 mm × 159 mm Panel Size (approx.) 188 mm × 58 mm × 12 mm Mass (approx.) 1.5 kg (excluding accessories)
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1-4 (No.MA055) 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 CD 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. (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) It 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. 1M (caption) Anti-static wrist strap Conductive material (conductive sheet) or iron plate PickupShort-circuit point (Soldering) Flexible wire