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Extracted text from Jvc KWAVX 746 U Service Manual (Ocr-read)
Page 1
1-2 (No.MA493)
SPECIFICATION
*1 Only for KW-ADV794/KW-AVX748/KW-AVX740
*2 Only for KW-ADV794/KW-AVX740/KW-AVX640.
Design and specifications are subject to change without notice.
If a kit is necessary for your car, consult your telephone directory for the nearest car audio speciality shop.
KW-ADV794J/KW-AVX748JW/KW-AVX740J/KW-AVX640J
AMPLIFIER
Power Output 20 W RMS × 4 Channels at 4 -„¦ and
-‰¤ 1% THD+N
Signal-to-Noise Ratio 80 dBA (reference: 1 W into 4 -„¦)
Load Impedance 4 -„¦ (4 -„¦ to 8 -„¦ allowance)
Equalizer Control Range Level ±12 dB
Audio Output Level
FRONT OUT, REAR OUT, SUBWOOFER OUT Line-Out Level/Impedance 4 V/20 k-„¦ load (full scale)
Output Impedance 1 k-„¦
Video Output (composite)
VIDEO OUTColor System
PAL/NTSC
Video-Out Level/Impedance 1 Vp-p/75-„¦
Other Terminals Input
LINE IN, VIDEO IN, CAMERA IN, USB input, MIC IN*1, AUX, Antenna input
Others Expansion port*2, OE REMOTE, RGB input
FM/AM TUNER
Frequency Range FM with channel interval set to 200 kHz 87.9 MHz to 107.9 MHz
with channel interval set to 50 kHz 87.5 MHz to 108.0 MHz
AM with channel interval set to 10 kHz 530 kHz to 1 700 kHz
with channel interval set to 9 kHz 531 kHz to 1 611 kHz
FM Tuner Usable Sensitivity 9.3 dBf (0.8 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 40 dB
AM Tuner Sensitivity/Selectivity 20 µV/40 dB
DVD/CD
Signal Detection System Non-contact optical pickup (semiconductor laser)
Frequency Response DVD, fs=48 kHz/96 kHz 16 Hz to 22 000 Hz
VCD/CD 16 Hz to 20 000 Hz
Dynamic Range 93 dB
Signal-to-Noise Ratio 95 dB
Wow and Flutter Less than measurable limit
USB
USB Standards USB 2.0 Full Speed
Data Transfer RateFull Speed Maximum 12 Mbps
Low Speed Maximum 1.5 Mbps
Compatible Device Mass storage class
Compatible File System FAT 32/16/12
Max. Current DC 5 V 1A
BLUETOOTH (Only for KW-ADV794/KW-AVX748/KW-AVX740)
Version Bluetooth 2.0 certified
Output Power +4 dBm Max. (Power class 2)
Service Area Within 10 m (10.9 yd)
ProfileHFP (Hands-Free Profile) 1.5
OPP (Object Push Profile) 1.1
A2DP (Advanced Audio Distribution Profile) 1.2
AVRCP (Audio/Video Remote Control Profile) 1.3
PBAP (Phone Book Access Profile) 1.0
MONITOR
Screen Size 6.1 inch wide liquid crystal display
Number of Pixel
1 152 000 pixels : 800 (horizontal) × 3 (RGB) × 480 (vertical)
Drive Method TFT (Thin Film Transistor) active matrix format
Color System NTSC/PAL
Aspect Ratio 16:9 (wide)
GENERAL
Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)
Grounding System Negative ground
Allowable Storage Temperature -10°C to +60°C (14°F to 140°F)
Allowable Operating Temperature 0°C to +40°C (32°F to 104°F)
Dimensions (W × H × D) Installation Size (approx.) 182 mm × 111 mm × 160 mm (7-3/16 × 4-3/8 × 6-5/16)
Panel Size (approx.) 188 mm × 117 mm × 10 mm (7-7/16 × 4-5/8 × 7/16)
Mass (approx.) 2.3 kg (5.1 lbs) (including the Trim plate and Sleeve)
Page 2
(No.MA493)1-3 * Only for KW-AVX740,KW-AVX746
Design and specifications are subject to change without notice.KW-AVX740E/KW-AVX640E/KW-AVX746EU/KW-AVX646EU
AMPLIFIER
Maximum Power Output Front/Rear 50 W per channel
Continuous Power Output (RMS) Front/Rear 20 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)
Equalizer Control Range Level ±12 dB
Signal-to-Noise Ratio 70 dB
Audio Output Level
FRONT OUT, REAR OUT,
SUBWOOFER OUTLine-Out Level/Impedance4 V/20 k-„¦ load (full scale)
Output Impedance1 k-„¦
Video Output (composite)
VIDEO OUTColor System PAL/NTSC
Video-Out Level/Impedance
1 Vp-p/75 -„¦
Other Terminals Input
LINE IN, VIDEO IN, CAMERA IN, USB input, MIC IN*, AUX, Aerial input
Others OE REMOTE, RGB input
FM/AM TUNER
Frequency Range FM 87.5 MHz to 108.0 MHz
AM (MW) 531 kHz to 1 611 kHz
(LW) 153 kHz to 279 kHz
FM Tuner Usable Sensitivity 9.3 dBf (0.8 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 40 dB
MW Tuner Sensitivity/Selectivity 20 µV/40 dB
LW Tuner Sensitivity 50 µV
DVD/CD
Signal Detection System Non-contact optical pickup (semiconductor laser)
Frequency Response DVD, fs=48 kHz/96 kHz 16 Hz to 22 000 Hz
VCD/CD 16 Hz to 20 000 Hz
Dynamic Range 93 dB
Signal-to-Noise Ratio 95 dB
Wow and Flutter Less than measurable limit
USB
USB Standards USB 2.0 Full Speed
Data Transfer Rate Full Speed Maximum 12 Mbps
Low Speed Maximum 1.5 Mbps
Compatible Device Mass storage class
Compatible File System FAT 32/16/12
Max. Current DC 5 V 1A
BLUETOOTH (Only for KW-AVX740A/KW-AVX746)
Version Bluetooth 2.0 certified
Output Power +4 dBm Max. (Power class 2)
Service Area Within 10 m
ProfileHFP (Hands-Free Profile) 1.5
OPP (Object Push Profile) 1.1
A2DP (Advanced Audio Distribution Profile) 1.2
AVRCP (Audio/Video Remote Control Profile) 1.3
PBAP (Phone Book Access Profile) 1.0
MONITOR
Screen Size 6.1 inch wide liquid crystal display
Number of Pixel
1 152 000 pixels : 800 (horizontal) × 3 (RGB) × 480 (vertical)
Drive Method TFT (Thin Film Transistor) active matrix format
Color System PAL/NTSC
Aspect Ratio 16:9 (wide)
GENERAL
Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)
Grounding System Negative ground
Allowable Storage Temperature -10°C to +60°C
Allowable Operating Temperature 0°C to +40°C
Dimensions (W × H × D) Installation Size (approx.) 182 mm × 111 mm × 160 mm
Panel Size (approx.) 188 mm × 117 mm × 10 mm
Mass (approx.) 2.3 kg (including the Trim plate and Sleeve)
Page 13
1-14 (No.MA493)(2) Remove the two screws C attaching the Gear base assembly.
(See Fig.10)
Fig.10
3.2.5 Removing the Loading arm holder. (See Fig.11)
(1) Remove the two screws D attaching the Loading arm holder.
(2) Remove the Loading arm spring R.
Fig.11
3.2.6 Removing the Loading moor assembly (See Fig.12)
(1) Remove the three screws E attaching the Loading motor
assembly.
Fig.123.2.7 Removing the Slide cam assembly (See Fig.13)
(1) Slide to backward the Slide cam assembly and the remove
the Slide cam spring.
(2) Slide to frontward the slide cam assembly, and then take
out it.
Fig.13
3.2.8 Removing the Photo board (See Fig.14)
(1) Pressing the hook c and then slide to backward (slide to the
arrow side) the Disc plate.
(2) Remove the one screw F attaching the Photo board.
Fig.14
3.2.9 Removing the Loading motor (See Fig.15 to 18)
(1) Remove the A wheel gear. (See Fig.15)
Fig.15
C
D
Loading arm
spring R Loading arm
holder
E
Slide cam assembly
Slide cam spring
hook c
hook c
F
Photo board
A Wheel gea r
Page 15
1-16 (No.MA493)
SECTION 4
ADJUSTMENT
4.1 Service mode
4.2 Test instruments required for adjustment
(1) Digital oscilloscope (100MHz)
(2) Digital tester
(3) Test Disc
(4) Extension cable :EXTXD001-50PF (CN403 --- CN105)4.3 Standard measuring conditions
Power supply voltage DC14.4V(10.5 to 16V)
Load impedance 20K ohm (2 Speakers connection)
Output Level Line out 2.5V (Vol. MAX)
4.4 Standard volume position
Balance and Bass &Treble volume : lndication"0"
Loudness : OFF
4.5 Dummy load
Exclusive dummy load should be used for AM and FM.
For FM dummy load, there is a loss of 6dB between SSG output and antenna input.
The loss of 6dB need not be considered since direct reading of figures are applied in this working standard.
4.6 How to connect the extension cable for adjusting
Caution:
Be sure to attach the heat sink and rear bracket onto the power amplifier IC and regulator IC respectively, before supply the power.
If voltage is applied without attaching these parts, the power amplifier IC and regulator IC will be destroyed by heat.
CN105 CN403
EXTXD001-50PF
