Kenwood TK-2107G Service Manual

TK-2107G15MCU: 38268MCA060GU (IC403)Pin No. I/O Port Name Function1 O VC1 Variable capacity tune control2 O VC2 Variable capacity tune control3 I NC NC4 I TIBI QT/DQT external circuit center pointinput5 I TI QT/DQT signal input6 I BUSY Busy input7 l BATT Battery voltage detection8 l NC NC9 O VCCN Frequency regulation output10 O APC TX: Auto power control D/A outputRX: BPF tuning D/A output11~14 I NC NC15 O BEEP Beep output16 O TO QT/DQT output17 l NC NC18 I PTT [PTT] key input Connected to RXD19 O TXD RS-232C output Connected to SP/MICtest (REM)20 I RXD RS-232C input Connected to [PTT] line21 l NC NC22 I SELF Self program L: Disable23 I MONl [MONl] key input24~27 I NC NC28 l ENC3 Encode input (channel select)29 l ENC2 Encode input (channel select)30 l ENC1 Encode input (channel select)31 l ENC0 Encode input (channel select)32 l INTO Power detection control33 I RST Reset input34 I NC NC35 O NC NC36 l XIN 7.3728MHz oscillator37 O XOUT 7.3728MHz oscillator38 I VSS GND39 O SHIFT Beat shift H: Shift on40 O PABC Final supply H: On41 O WNRC Audio reference sensitivity L: Narrow42 O WNTC MAX Dev. Control Narrow: H43~46 l NC NC47 l/O SDA EEPROM data linePin No. I/O Port Name Function48 O SCL EEPROM clock line49 I UL PLL unlock detection pin L: Unlock50~54 l NC NC55 O DT Common data output56 O CK Common clock output57 O NC NC58 O LE PLL IC enable H: Iatches59,60 O NC NC61 O 5MCControl of power supply (5M) for every-thing except the microcomputer andEEPROM L: Power supply on62 O AFCO AF amp power suppIy H: On63 O RX TX/RX VCO select H: RX64 O GLED Green LED control H: Lit65 O RLED RED LED control H: Lit66 O SAVE Save control H: Save off67 O MUTE Mute control H: Mic mute, L: AF mute68 O 5RC Reception power suppIy control L: On69 O 5TC Transmission power suppIy controlH: On70~88 O NC NC89 l VCC Microcomputer power supply, 5V input90 l VREF A/D conversion reference voltage; con-nected to Vcc91 l AVSS A/D converter power supply; connectedto Vss92~95 O NC NC96~100 I NC NCFET: 2SK2596-E (Q102)■ Absolute Maximum Ratings (Ta=25°C)Item VDSS VGSS ID Pch Tch TstgRating 17V ±10V 0.4A 3WTc=25°C 150°C –45~+150°CFET: 2SK2595-E (Q105)■ Absolute Maximum Ratings (Ta=25°C)Item VDS VGSS ID Pch Tch TstgRating 17V ±10V 1.1A 20WTc=25°C 150°C –45~+150°CSEMICONDUCTOR DATA