Kenwood KDC-V7521/Y Service Manual

Contents

KDC-V7521/Y7Pin No. Pin Name I/O Description Processing Operation72 AVSS - A/D converter ground connection terminal Connected to GND lines.73 AVREF I A/D converter reference voltage input terminal74 PHONE I PHONE detection input 1V or less : TEL MUTE, 2.5V or greater : NAVIMUTE75 SRM-SW3 I Mask mechanism position SW3 input Panel : (SW1,SW2,SW3)=(Lo,Lo,Hi)76 SRM-SW1 I Mask mechanism position SW1 input Angle : (SW1,SW2,SW3)=(Hi,Hi,Lo)Eject : (SW1,SW2,SW3)=(Hi,Hi,Hi)77 SRM-SW2 I Mask mechanism position SW2 input Mask : (SW1,SW2,SW3)=(Lo,Lo,Lo)78 SRM-DET I Mask mechanism detection input Lo : Mechanism detected, Hi : mechanism notdetected79 NOISE I FM noise detection input80 S-METER I S-meter input from F/E81 R-DATA I Data input from the RDS decoder IC Except RDS, RBDS model : Not used (pull downto GND lines)82 R-QUAL I Quality input from the RDS decoder IC Except RDS, RBDS model : Not used (pull downto GND lines)83 IFC-OUT I F/E IFC OUT input terminal Lo : Station detected, Hi : Not detected84,85 N.C. I Not used(pull down to GND lines)Standby : (SRM+B,SRM-B)=(Lo,Lo)86 SRM-B O SRM mechanism submotor control output Clock wise : (SRM+B,SRM-B)=(Hi,Lo)Counter clock wise : (SRM+B,SRM-B)=(Lo,Hi)Break : (SRM+B,SRM-B)=(Hi,Hi)87 R-CLK I Clock input from the RDS decoder IC Except RDS, RBDS model : Not used (pull downto GND lines)88 CH-REQC I Request input from changers Lo : Request89 KEY-REQ I Communication request from LCD driver IC90 CD-SW1 I Loading SW detection input Lo : Loading start91 CD-SW2 I 12cm disc detection SW input Lo : 12cm disc detected92 SRM+B O SRM mechanism submotor control output93 BU-DET I Momentary power down detection input Hi : When momentary power down detected or BU OFFLo : BU ON94 CH-DATAC I Data input from changers95 CH-DATAH O Data output to changers96 CH-CLK I/O Clock input/output with changers97 L-DATA L I Data input from the LCD driver IC98 L-DATA S O Data output to the LCD driver IC99 L-CLK I/O Clock output to the LCD driver IC/Panel detaching detection input(LCD Driver) Lo : Panel attached100 PAN5V O Panel 5V control Hi : Panel attached, Lo : Panel detachedMICROCOMPUTER’S TERMINAL DESCRIPTION