Kenwood TH-D72A Service Manual

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Contents

TH-D72A/D72E12Main MCU: 5F3651TDFC(TX-RX (Control) unit (A/3) IC737)Pin No. Port Name I/O Function1 VREF - Reference voltage2 AVCC - VCC (3.3V Analog)3 PKD96M O PKD (9600bps) data mute L: ON4 BSFT2 O Beat shift for TNC MCU clockH: ON5 TNC_CAR O RX carrier signal input (for TNC)L: ON6 TONE O Tone output7 DTMF O DTMF tone output8 SKY_SW O COM port signal selectL: TNC, H: Main MCU9 BSFT1 O Beat shift for main MCU clockH: ON10 CNT_CLK O Clock for electrical volume IC11 CNT_DT O Data for electrical volume IC12 DAC_EN O Enable for electrical volume ICL: ON13 BYTE - Not used (GND)14 CNVSS I Not used15 PKTBND O TNC input band selectL: Band A, H: Band B16 VTX O TX power supply control17 /RST I Reset18 XOUT O System clock output (11.0592MHz)19 VSS - GND20 XIN I System clock input (11.0592MHz)21 VCC - VCC (3.3V)22 DAC_RST O Reset for electrical volume IC23 PKS_IN I PKS for TNC MCU H: TX24 DC_DET I DC input detection L: ON25 INT I INT26 RTS_TNC O RTS for TNC MCU27 RXD_TNC I RXD for TNC MCU28 CTS_TNC I CTS for TNC MCU29 TXD_TNC O TXD for TNC MCU30 TAB_S O Power supply control for RXsignaling AMP L: ON31 LCDCNT O LCD contrast adjustment outputL: ON32 LDA I Lock detection input from PLL (IC431)H: ON33 BEEP O Beep output34 RXD_COM I RXD for COM port35 TXD_COM O TXD for COM port36 TXD1 O Not usedPin No. Port Name I/O Function37 VCC I VCC (3.3V)38 RXD1 I Not used39 VSS - GND40 33TNC_S O Power supply control for TNCL: ON41 SAVE2 O RX audio filter switch H: ON42 TXD_S O TXD for SUB MCU43 RXD_S I RXD for SUB MCU44 RST_S O Reset for SUB MCU L: ON45 LDB I Lock detection input from PLL (IC513)H: ON46 KEY_O1 O Key matrix47 KEY_O0 O Key matrix48 KEY_IT I Key matrix49 KEY_I4 I Key matrix50 MICB_S O Power supply control for VOX AMP51 RTC_SDA I/O Data for RTC52 RTC_SCL O Clock for RTC53 INTRTC I INT for RTC L: ON54 KEY_I3 I Key matrix55 KEY_I2 I Key matrix56 KEY_I1 I Key matrix57 KEY_I0 I Key matrix58 32K_SW O Clock output control for RTC H: ON59 KEY_O4 O Key matrix60 KEY_O3 O Key matrix61 KEY_O2 O Key matrix62 LAMP O Back light control H: ON63 C_S O Power supply control for 33C and47C H: ON64 GP_ON O Always Low65 TXD_IGPS O TXD for GPS module66 RXD_IGPS I RXD for GPS module67 GP_PS O Power save control for GPS module68 VGPS O Power supply control for GPSmodule L: ON69 /LCD_RST O Reset for LCD70 /LCD_CS O Not used71 /LCD_WR O W/R for LCD72 A[0] O Data for LCD73 D[7] O Data for LCD74 D[6] O Data for LCD75 D[5] O Data for LCD76 D[4] O Data for LCD77 D[3] O Data for LCDSEMICONDUCTOR DATA