Kenwood TKR-840 Service Manual

Also see for TKR-840: Brochure & specs Instruction manual

IKR-840 TERMINAL FUNCTION64CONTROL UNIT (X53-3880-10)CN1rTerminal Terminal Terminal functionNo. name1 RA RX Audio (filtered signal)2 RXG RX Audio ground3 DET Detector audio4 DEG Detector audio ground5 SC Noise squelch control6 RSSI RX signal strength indicator7 CK Common clock8 DT Common data9 ESR Shift register strobe10 EVR Electronic volume strobe11 SCL RX EEPROM serial clock12 SDA RX EEPROM serial data13 DP PLL data signal14 CP PLL clock signal15 EPR RX main PLL strobe signal16 LDR RX PLL lock detector17 GND Ground18 CVR RX main PLL lock voltage19 NC No connection20 NC No connection21 B Power supply (Vee)22 B Power supply (Vee)23 B Power supply (Vee)24 NC No connection25 NC No connection26 NC No connectionCN2Terminal Terminal Terminal functionNo. name1 MOD Modulation signal2 TO Signalling signal3 MIG Microphone ground4 EVT TX electronic volume enable signal5 EST TX shift register enable signal6 DT Data signal for IC3 & IC47 CK Clock signal for IC3 & IC48 NC No connection9 NC No connection10 SDA RX EEPROM serial data11 SCL RX EEPROM serial clock12 LDT TX main PLL lock detector13 PRT High temperature detect14 CP TX both PLL clock signal15 NC No connection16 DP TX both PLL data signal17 EXR Exit reference detector18 CVT TX main PLL lock voltage19 REV Reverse TX power detector20 FWD Forward TX power detector21 GND Ground22 PAG Digital pager signal23 B Power supply (Vee)24 B Power supply (Vee)25 B Power supply (Vee)26 PAB Power supply for AF PA ICCN31/0 h'"erminal TerminalNo. nameI 1 SPI- 2 SPGI 3 VLO- 4 VLII 5 GNDI 6 BLT0 7 BC0 8 HOK0 9 PTT0 10 EXR0 11 SW11/0 12 SW20 13 B0 14 B0 15 SW3I 16 SW4- 17 TESTI 18 SW5. 19 SW6- 20 EN70 21 MOAT0 22 DT0 23 CK- 24 GND. 25 Ml. 26 MIG1/000-0000--01/0II0.0IIII-0IIIITerminal function 1/0Local speaker input 0Local speaker ground -AF volume control output IAF volume control input 0Ground -Mic connector J700 (1pin) Iav constant voltage 0Hook-switch IPress-to-talk-switch IExit reference indicator 0Programable switch S705 IProgramable switch S704 IPower supply (Vee) 0Power supply (Vee) 0Programable switch S703 IProgramable switch S702 ITest switch IProgramable switch S701 IProgramable switch S700 IShift register enable signal 0Mic connector J700 (Spin) ISerial data for IC703 0Common serial clock 0Ground .Microphone signal IMicrophone ground -