Kenwood TKR-750 Service Manual

Also see for TKR-750: Brochure & specs Service manual Function reference Service manual Instruction manual

50TKR-750Connector Terminal Terminal I/O Terminal functionNo. No. Name6 CP I Clock input for PLL7 REF I Reference frequency signal inputCN350 1 GND – Ground2 STT I Switching signal input for TX VCO3 8CL I 8V input through the ripple filter4 CV I RX PLL lock voltage5 9CL I 9V input through the ripple filter6 MO I Modulation signal inputCN351 1 VO O TX VCO output2 GND – GroundACC 25 pin D-sub ConnectorConnector Terminal Terminal I/O Terminal functionNo. No. Name1 NC – No connection2 RXD2 I Serial data to radio3 TXD2 O Serial data from radio4 AI1 I Programmable function input 15 AI2 I Programmable function input 26 AI3 I Programmable function input 37 DG – Control line ground8 TD I TX data input (data or signalling)Input impedance: 600ΩCoupling: AC couplingDeviation: 0.75kHz (wide)/0.35kHz (Narrow)(100Hz 0.5Vp-p input)9 TA I TX audio input (voice)Input impedance: 600ΩCoupling: AC couplingDeviation: 60% deviation(1kHz 280mVrms ± 25mV input)10 RD O RX data output (voice & data)Output impedance: 1kΩ or lessCoupling: AC couplingFrequency response: ± 2.5dB at10~3000HzOutput level: 70~90mVrms(standard modulation)11 RA O RX audio output (voice)Output impedance: 1kΩ or lessCoupling: AC couplingOutput level: 360~440mVrms(standard modulation)12 RXG – RX signal ground(for RA,RD ground only)13 SPM I Speaker mute signal input“L”: Mute on14 NC - No connectionConnector Terminal Terminal I/O Terminal functionNo. No. Name15 EMON I External monitor switch input“L”: Monitor on, “H”: Monitor off16 EPTT I External press-to-talk switch input“L”: PTT on, “H”: PTT off17 SC O Squelch control output“L”: Busy, “H”: Not busy18 NC - No connection19 TXG - TX signal ground(for TA,TD ground only)20 AIO1 I/O Programmable function input/output 121 AIO2 I/O Programmable function input/output 222 AIO3 I/O Programmable function input/output 323 AIO4 I/O Programmable function input/output 424 AIO5 I/O Programmable function input/output 525 AIO6 I/O Programmable function input/output 6ACC 15 pin ConnectorConnector Terminal Terminal I/O Terminal functionNo. No. Name1 SB O Power supply output after powerswitch; 1A maximum2 SB O Power supply output after powerswitch; 1A maximum3 NC – No connection4 GND – Ground5 GND – Ground6 SPG – Speaker ground7 RD O RX data output8 RSSI O RSSI output9 SPI I Internal speaker input10 AO1 O Auxiliary output 111 AO2 O Auxiliary output 212 SPO O External speaker output13 AO3 O Auxiliary output 314 AO4 O Auxiliary output 415 AO5 O Auxiliary output 513 12 11 10 9 8 7 6 5 4 3 2 120 19 18 17 1625 24 23 22 21 15 1413 10 7 4 114 11 8 5 215 12 9 6 3TERMINAL FUNCTION