JVC KD-LX555R service manual Sel Apc Ldo, Gnd Off, Gvsw, Gnd Cd-Rw

Page 17

• Pin function

Pin No.

Symbol

I/O

 

 

 

 

 

 

Function

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

VCC

-

3.3V power supply pin

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

FNI

I

Main-beam amp input pin

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

FPI

I

Main-beam amp input pin

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

TPI

I

Sub-beam amp input pin

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

TNI

I

Sub-beam amp input pin

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6

MDI

I

Monitor photo diode amp input pin

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7

LDO

O

Laser diode amp output pin

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8

SEL

I

APC circuit ON/OFF control signal, laser diode (LDO) control signal input

 

 

 

or bottom/peak detection frequency change pin.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SEL

 

APC

 

 

 

 

 

LDO

 

 

 

 

 

 

circuit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GND

 

OFF

 

Connected VCC through 1k resistor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Hiz

 

ON

 

Control signal output

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VCC

 

ON

 

Control signal output

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9

TEB

I

Tracking error balance adjustment signal input pin

 

 

 

 

 

 

Adjusts TE signal balance by eliminating carrier component from PWM signal (3-state output,

 

 

 

PWM carrier = 88.2kHz) output from TC94A14F/FA

 

 

 

TEBC pin using RC-LPF and inputting DC.

 

 

 

 

 

 

TEBC input voltage:GND~VCC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10

TEN

I

Tracking error signal generation amp negative-phase input pin

 

 

 

 

 

 

 

 

 

 

 

 

 

11

TEO

O

Tracking error signal generation amp output pin.

 

 

 

 

 

 

Combining TEO signal RFRP signal with TC94A14F/FA configures tracking search system.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

12

RFDC

O

RF signal peak detection output pin

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

13

GVSW

I

AGC/FE/TE amp gain change pin

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GVSW

 

Mode

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GND

 

CD-RW

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Hiz

 

Normal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VCC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

14

VRO

O

Reference voltage (VRO) output pin

 

 

 

 

 

 

 

 

 

 

*VRO=1/2VCC When VCC=3.3V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15

FEO

O

Focus error signal generation amp output pin

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

16

FEN

I

Focus error signal generation amp negative-phase input pin

 

 

 

 

 

 

 

 

 

 

 

 

 

 

17

RFRP

O

Signal amp output pin for track count

 

 

 

 

 

 

 

 

 

 

Combining RFRP signal and TEO signal with TC94A14F/FA configures tracking search system.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

18

REIS

I

 

 

 

 

 

 

 

 

 

 

 

 

19

RFGO

O

RF signal amplitude adjustment amp output pin

 

 

 

20

RFGC

I

RF amplitude adjustment control signal input pin

 

 

 

 

 

 

Adjusts RF signal amplitude by eliminating carrier component from PWM signal (3-state output,

 

 

 

PWM carrier=88.2kHz)output fromTC94A14F/14FA *RFGC pin using RC-LPF and inputting DC.

 

 

 

*RFGC input voltage:GND~VCC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

21

AGCIN

I

RF signal amplitude adjustment amp input pin

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

22

RFO

O

RF signal generation amp output pin

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

23

RFI

I

RF signal generation amp input pin

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24

GND

-

GND pin

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(No.49793)1-47

Image 17
Contents Area Suffix KD-LX555RBA6956AN IC830, IC831 Reversible motor driver SCL SDA GND A2 GNDBR24C01AFV-W-X IC1502 Eeprom GNDGND VCC SCL SDAAddress Data DecoderVDD1 Rclk VSS3 CMP MUXQual VDD2HA13164A IC961 Regulator HD74HCT126T-X IC1500,IC1503 Buffer LA47505 IC941 Power amp Outfr AC CONT1Stby OUTFR+VCCP2 VIN4 VIN4G VIN1-A VIN1+A VCCP1 VO+VIN1 VIN1-BVIN1+A VIN1-AVCCP1 VCCP2Front OUT 2 Volume Rear OUT2 Rear OUT1 Soft Timer GND VDD Select DetectorVDD OUT Clock DataDefn DefpINA INB11 LC75878W IC601 LCD driver Aoutput Input +INPUT Output GND STB VIN Vout12 NJM4565V-X IC1572 Dual ope amp 13 NJU7241F25 IC1651 RegulatorPIN SEL TEB Rfgc Vctrlpin APC SW TE BAL 15 TA2157FN-X IC1601RF ampVCC APC on APC OFFGND OFF SEL APC LDOGvsw GND CD-RW16 TC94A14FA IC1621 DSP & DAC AVSS3 PVDD350 No.49793 Vddt ResetStanby Vssl18 UPD784217AGC208 IC962 Main micon Buzzer Power12CDAI 12CDAO19 UPD784225GK-629 IC1501 CPU Test Mode MP3 ResetMP3 STB DAC ML20 PCM1716E-X IC1571 D/A converter Block diagram Standard schematic diagrams CD servo control section LCD & Key control section KD-LX555R Electrical parts listRK104JA0J Resistor Front board CD board RK822JA0J COMP.RESISTOR RK303JA0J COMP.RESISTOR
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KD-LX555R specifications

The JVC KD-LX555R is a feature-rich car stereo receiver that combines cutting-edge technologies with an impressive array of functionalities, making it a popular choice among car audio enthusiasts. One of the standout features of the KD-LX555R is its compatibility with various audio playback formats, including MP3, WMA, and WAV files. This versatility allows users to enjoy their favorite music from different sources without compromising on sound quality.

Equipped with a front AUX input and a USB port, the KD-LX555R facilitates convenient connectivity for external devices like smartphones and USB drives. This feature enables users to access their digital music collections seamlessly while driving. Additionally, the unit's Bluetooth capability allows for hands-free calling and wireless audio streaming, enhancing convenience and safety by minimizing distractions while driving.

The receiver boasts a sleek and modern design, featuring an easy-to-read LCD display and user-friendly controls. The customizable illumination options enable users to match the display color to their vehicle’s interior, adding a personalized touch. Its ergonomic layout ensures that drivers can adjust settings and navigate menus with minimal effort, allowing for a safer driving experience.

Sound quality is a paramount consideration for JVC, and the KD-LX555R does not disappoint. It features a powerful MOSFET amplifier, delivering robust audio performance with impressive clarity and depth across all frequencies. The inclusion of a 3-band parametric equalizer also allows users to fine-tune the audio output according to their preferences and the acoustics of their car.

For those who desire even more control over their sound, the KD-LX555R supports additional amplifiers and subwoofers through its preamp outputs. This feature empowers users to easily upgrade their sound systems and achieve the desired audio experience. Moreover, the receiver integrates seamlessly with smartphones, enabling features like music control through voice commands.

In summary, the JVC KD-LX555R is a comprehensive car audio solution that emphasizes connectivity, sound quality, and user convenience. With its modern features, robust performance, and customizable options, it caters to a wide range of audio preferences, making it a worthy addition to any car. Whether enjoying favorite tracks or making hands-free calls, the KD-LX555R delivers an exceptional in-car experience that combines technology with practicality.