Kenwood KDC-V7521/Y Service Manual

Contents

5KDC-V7521/YMICROCOMPUTER’S TERMINAL DESCRIPTIONPin No. Pin Name I/O Description Processing Operation1 AM+B O AM+B control Hi : During AM reception2 FM+B O FM+B control Hi : During FM reception, Hi : During FM receptionif with RDS, RDBS3 AFS O Noise detection time constant switching terminal Hi : During FM reception, Lo : During FM seek orAF search4 PLL-DATA I/O Data input/output with F/E5 PLL-CLK I/O Clock output to F/E6 EVDD - Positive power supply connection terminal Connected to BU 5V lines.7 EVSS - Ground connection terminal Connected to GND lines.8 N.C. O Not used (N.C.)9 BEEP O BEEP sound output10 REMO I Data input from the remote control light sensor11 PRE-MUTE L O Pre-out mute control (L) When M MUTE L input is Lo during CD sourceselected, PRE MUTE L outputs Lo.12 PRE-MUTE R O Pre-out mute control (R) When M MUTE R input is Lo during CD sourceselected, PRE MUTE R outputs Lo.13 IC2-SDA I/O Data line with IC2,CD mechanism MI-COM.14 IC2-CLK O Clock line with IC2,CD mechanism MI-COM.15,16 N.C. O Not used (N.C.)17 DA-SDA / DIM-CON O Data output to D/A converter (V-LED model) Data line with D/A converter/ Dimmer control output / Hi : Dimmer OFF, Pulse wave shape : Dimmer ON18 TEST - Test terminal Not used (Connected to GND lines)19 P-MUTE O Power IC mute control output Lo : Mute (during POWER OFF, ALL OFF, TELMUTE)20 P-STBY O Power IC standby control output Lo : Power IC OFF, Hi : Power IC ON, ALL OFFmode21 MUTE O IC2 mute control output OPEN (Hi) : Mute ON, Lo : Mute OFF22,23 N.C. O Not used (N.C.)24 ACC-DET I ACC detection terminal Lo : ACC ON, Hi : ACC OFF25 DIMMER I Small lights detection input Lo : During vehicle small lamps turn on.26 SW5V O SW 5V control output Lo : POWER ON modeBass boost OFF__Hi : 160msec, Lo : 40msec27 EXT-AMP-CONT O External amp. control output Bass boost LOW__Hi : 130msec, Lo : 70msecBass boost HI__ Hi : 100msec, Lo : 100msec28 P-CON O Power control output Lo : POWER OFF mode, Hi : POWER ON mode29 ANT-CON O Antenna control output Hi : During TUNER mode or TI reception30 P-ON O SW 14V control output Hi : POWER ON mode31 RESET I Reset input terminal Lo : System reset32 XT1 I Sub clock resonator connection terminal Clock count during POWER OFF mode IC1 (ELECTRIC UNIT : X25-9392-7X, X25-8762-72)