Jvc KDG 645 UH Service Manual

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Jvc KDG 645 UH Service Manual

Extracted text from Jvc KDG 645 UH Service Manual (Ocr-read)


Page 1

1-2 (No.MA377) SPECIFICATION KD-G441/KD-G351 Design and specifications are subject to change without notice.AUDIO AMPLIFIER SECTION Maximum Power Output Front/Rear 50 W per channel Continuous Power Output (RMS) Front/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) Tone Control Range Bass ±12 dB at 60 Hz Middle ±12 dB at 1 kHz Treble ±12 dB at 10 kHz Frequency Response 40 Hz to 20 000 Hz Signal to Noise Ratio 70 dB Audio Output Level (for KD-G441) Line-Out Level/Impedance 2.5 V/20 kΩ load (full scale) Output Impedance 1 kΩ Subwoofer-Out Level/Impedance 2.5 V /20 kΩ load (full scale) Other Terminals AUX (auxiliary) input jack USB input jack Steering wheel remote input (forKD-G441) 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 MW Tuner Sensitivity/Selectivity 20 µV/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 MP3 Decoding Format: (MPEG1/2 Audio Layer 3) Max. Bit Rate 320 kbps WMA (Windows Media® Audio) Decoding Format Max. Bit Rate 320 kbps USB SECTION USB Standard USB 1.1, USB 2.0 Data Transfer Rate (Full Speed) Max. 12 Mbps Storage Less than 8 GB (1 partition type) Compatible Device Mass storage class (except HDD) Compatible File System FAT 32/16/12 Playable Audio Format MP3/WMA Max. Current 500 mA 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 × 160 mm Panel Size (approx.) 188 mm × 58 mm × 13 mm Mass (approx.) 1.3 kg (excluding accessories)

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(No.MA377)1-3 KD-G447/KD-G357 Design and specifications are subject to change without notice.AUDIO AMPLIFIER SECTION Maximum Power Output Front/Rear 50 W per channel Continuous Power Output (RMS) Front/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) Tone Control Range Bass ±12 dB at 60 Hz Middle ±12 dB at 1 kHz Treble ±12 dB at 10 kHz Frequency Response 40 Hz to 20 000 Hz Signal to Noise Ratio 70 dB Other Terminals AUX (auxiliary) input jack, USB input jack TUNER SECTION Frequency Range FM1/FM2 87.5 MHz to 108.0 MHz FM3 65.00 MHz to 74.00 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 MW Tuner Sensitivity/Selectivity 20 µV/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 MP3 Decoding Format: (MPEG1/2 Audio Layer 3) Max. Bit Rate 320 kbps WMA (Windows Media® Audio) Decoding Format Max. Bit Rate 320 kbps USB SECTION USB Standard USB 1.1, USB 2.0 Data Transfer Rate (Full Speed) Max. 12 Mbps Storage Less than 8 GB (1 partition type) Compatible Device Mass storage class (except HDD) Compatible File System FAT 32/16/12 Playable Audio Format MP3/WMA Max. Current 500 mA 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 × 160 mm Panel Size (approx.) 188 mm × 58 mm × 13 mm Mass (approx.) 1.3 kg (excluding accessories)

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(No.MA377)1-13 3.1.5 Removing the CD MECHANISM assembly (See Fig.3-7) (1) Remove the three screws J attaching the CD MECHANISM assembly. Fig.3-7 3.1.6 Removing the SWITCH BOARD assembly (See Fig.3-8) (1) Remove the VOLUME KNOB. (2) Remove the four screws K attaching the REAR COVER. (3) Disengage the nine hooks b engaged the REAR COVER. Fig.3-8 J J hook b hook bK K

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1-26 (No.MA377)3.2.20 Removing the spindle motor assembly (See Figs.27 and 28) - Remove the top cover, base board, chassis unit and clamper assembly. (1) From the top side of the chassis unit, turn the turn table from side to side and remove the two screws M attaching the spindle motor assembly through the hole of the turn table. (See Fig.27.) (2) From the bottom side of the chassis unit, turn the change gear 2 in the direction of the arrow 2 while pulling the trigger arm in the direction of the arrow 1 and let the pickup move in the direction of the arrow 3. (See Fig.28.) (3) Slide the spindle motor assembly in the direction of the arrow and take out it in an upward direction from the chassis unit. (See Fig.28.) Reference: Remove the wires from the soldered sections c' on the base board and remove them from the sections (d', e') on the chassis unit as required.Fig.27 Fig.28 M Turn table Chassis unit Wire(black) d'e' Wire(red) Spindle motor assembly Change gear 2 Trigger arm Chassis unit Pickup Base board c' 2 1 3

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1-30 (No.MA377)5.3 16 PIN CORD DIAGRAM (for KD-G644, KD-G645, KD-G646) BK YL VI RD GN / BK VI / BK WH / BKGN GY / BK WH 16 1 8 7 2 12 10 3 9 11 GY 4 7 6 5 4 3 2 116 15 14 13 12 11 10 9 BK RD BL BL/WH WH GN VI GYYL NC NC WH/BK GN/BK VI/BK GY/BK 8 OR/WH BK RD BL WHBlack Red Blue WhiteGN Green VI Violet GYGray YL Yellow OROrange OR / WH 15 5 BL / WH 6 BL