Kenwood TK-2180 Service Manual

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TK-218041Pin No. Name I/O Function5 EMC I External MIC inputImpedance : 1.8kΩ typ (at 1kHz)Audio level : 7.5± 2.5mVrms for 60% ofsystem deviationNominal DC voltage : 5.0± 1V DC6 ME - External MIC GND7 PTT I External PTT input L : PTT ON8 PF I Programmable function key inputInput voltage : 0V~5.0VInput level : 4.4V~5.0V (None), 3.1V~4.4V(PF2 key ON), 2.3V~3.1V (PF1 key ON), 0V~2.3V (PF1,PF2 key ON) (Pull up to 5V 10kΩ)9 OPT - Non connection10 E - GND11 5U O 5V power supply outputMax output current : 140mA12 TXD O Serial data outputL ≤ 0.45V, H ≥ 4.7V/25kΩ loadBaud rate : 115200bps max13 RXD I Serial data inputInput : L ≤ 1.0V, H ≥ 4.0V, Input voltage : 0V~5.0VBaud rate : 57600bps max14 NC (E) - Not use (GND)Solder padName I/O FunctionOPT5 O Option boad I/F 5Output : L ≤ 0.45V, H ≥ 4.7V/25kΩ loadOPT6 O Option boad I/F 6Output : L ≤ 0.45V, H ≥ 4.7V/25kΩ loadOPT3 I/O Option boad I/F 3Output : L ≤ 0.45V, H ≥ 4.7V/25kΩ loadInput : L ≤ 1.0V, H ≥ 4.0V, Input voltage : 0V~5.0VOPT1 O Option boad I/F 1Output : L ≤ 0.45V, H ≥ 4.7V/25kΩ loadName I/O FunctionRXD I Serial data inputInput : L ≤ 1.0V, H ≥ 4.0V, Input voltage : 0V~5.0VTXD O Serial data outputOutput : L ≤ 0.45V, H ≥ 4.7V/25kΩ loadRXI I Audio signal input (DC coupled) before de-emphasisSTON I Side tone input 1kHz, 5Vp-pTCONT I Speaker mute signal inputInput : L ≤ 1.0V, H ≥ 4.0V, Input voltage : 0V~5.0VTXO O MIC signal output (AC coupled) before pre-emphasisZL ≥ 22kΩ, 130± 50mVp-pRXEO O Audio signal output (DC coupled) after de-emphasisZL ≥ 30kΩ, 1± 0.3Vp-pOPT2 I/O Option boad I/F 2Output : L ≤ 0.45V, H ≥ 4.7V/25kΩ loadInput : L ≤ 1.0V, H ≥ 4.0V, Input voltage : 0V~5.0VOPT4 O Option boad I/F 4Output : L ≤ 0.45V, H ≥ 4.7V/25kΩ loadGND - GNDSB2 I Power input after power switch7.5V typ, 100mA maxRXEI I Audio signal input (DC coupled) after de-emphasisZin ≥ 15kΩ, 1± 0.3Vp-pTXI I MIC signal input (AC coupled) before pre-emphasisZin ≥ 22kΩ, 130± 50mVp-pRXO O Audio signal output (DC coupled) before de-emphasis5A O 5V power supply output 78mA maxDI/ANI I Data signal input Zin ≥ 22kΩ, 600± 200mVp-pINH O MIC mute signal inputRSSI O RSSI output Zo=56kΩMDSW I Man down switch inputInput : L ≤ 1.0V, H ≥ 4.0V, Input voltage : 0V~5.0VGND - GND for man down switchRXD1 I Serial data inputInput : L ≤ 1.0V, H ≥ 4.0V, Input voltage : 0V~5.0VTXD1 O Serial data output / PTT signal output (SC20-460)Output : L ≤ 0.45V, H ≥ 4.7V/25kΩ loadTERMINAL FUNCTION