This is the 32 pages manual for Jvc KDG 648 UF Service Manual. Read or download the pdf for free.
If you want to contribute, please mail your pdfs to info@audioservicemanuals.com.
Page: 1 / 32
Extracted text from Jvc KDG 648 UF 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 -„¦ 40 Hz to 20 000 Hz at no
more than 0.8% total harmonic distortion
Load Impedance 4 -„¦ (4 -„¦ to 8 -„¦ 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 k-„¦ load (full scale)
Output Impedance 1 k-„¦
Subwoofer-Out Level/Impedance 2.5 V /20 k-„¦ 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 -„¦)
50 dB Quieting Sensitivity 16.3 dBf (1.8 µV/75 -„¦)
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)
Page 2
(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 -„¦ 40 Hz to 20 000 Hz at no
more than 0.8% total harmonic distortion
Load Impedance 4 -„¦ (4 -„¦ to 8 -„¦ 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 -„¦)
50 dB Quieting Sensitivity 16.3 dBf (1.8 µV/75 -„¦)
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)
Page 12
(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
Page 14
(No.MA377)1-15 3.2.2 Removing the push switch
(See Figs.3)
(1) From the bottom side of the CD mechanism assembly, remove
the screw B attaching the push switch.
(2) Take out the push switch from the CD mechanism assembly.
Reference:
Remove the wires from soldered sections b of the push switch
as required.
3.2.3 Removing the base board
(See Figs.3 and 4)
Caution:
Solder the short land c before the flexible wire is disconnected from
the connector on the pickup. If the flexible wire is disconnected
without applying solder, the pickup may be destroyed by static
electricity. (See Fig.3.)
(1) From the bottom side of the CD mechanism assembly, remove
the screw C attaching the base board. (See Figs.3 and 4.)
(2) Solder the short land c on the pickup. (See Fig.3.)
(3) Disconnect the flexible wire from the connector on the pickup.
(See Fig.3.)
(4) Remove the base board from the joints d of the frame in the
direction of the arrow. (See Figs.3 and 4.)
Reference:
Remove the wires from the soldered sections e on the base
board as required. (See Fig.3.)
Caution:
When reattaching the base board, be sure to remove solder
from the short land c after connecting the flexible wire. (See
Fig.3.)Fig.3
Fig.4
B
b Wires
Push switchPickup
e
C
Base board
d
Pickup
c
Connector Flexible wire
Frame CD mechanism
assembly
C
Base board
Flexible wire
Frame
d
