Kenwood TK-790 Service Manual

Also see for FleetSync TK-790: Specifications Instruction manual Specifications Instruction manual

37TK-790/(B)/H(B)Control Unit (X57-5610-XX) (B/3)-10 : TK-790/(B) K -11 : TK-790(B) K2 -12 : TK-790H(B) KRef. No. Use/Function Operation/ConditionIC501 D FFIC502 LPFIC503 AVR Input : SB, Output : 8VIC504 Audio processorIC505 HPF/IDCIC506 AVR Input : 8V, Output : 5VIC508 Limiter/Buffer amplifierIC509 Buffer amplifierIC510 Summing amplifier/LPFIC511 DTMF encoderIC512 D/A converterIC513 LPF/Summing amplifierIC514 EEPROMIC515 Analog switchIC516 CPUIC517 Shift registerIC518 Buffer amplifierIC519 Flash ROMIC520 NOR gateIC521 Buffer amplifier/AmplifierIC522 Audio power amplifierIC523 Shift registerIC524 Buffer amplifier/De-emphasisIC525 DTMF decoderIC526 Compander amplifierQ501 DC switchQ502 DC switch On when 18V or moreQ503 DC switch On when the power switch onQ504 Muting switch MIC muteQ505 DC switchQ506,507 DC switch Timed power off switchQ509 DC switch Off when P/AQ510 DC switch Off when EXT SPQ511 DC switch Off when INT SPQ512 DC switch Off when RX busyQ513 DC switchQ514 Muting switch On when AF muteQ516,517 DC switch On when on signalling codeQ518 DC switch On when push the power switchQ519 Power switch On when the power switch onQ520 DC switch On when horn alertQ522 Beat shift switch On when beat shiftDESCRIPTION OF COMPONENTSRef. No. Use/Function Operation/ConditionQ523 DC switch Serial data inverterQ524 DC switch Serial data transmitterQ525 DC switchQ526,527 DC switch On when compander onQ528,529 DC switch On when compander offQ530~532 DC switch On when compander onQ533~540 DC switch On when output port onQ541 DC switch On when timed power offQ542,543 DC switch IGN switchQ544 DC switch Timed power off switchD501 Voltage reference Protection of high voltageD502 Reverse currentpreventionD503 Surge absorptionD504 Voltage referenceD505,506 DC switchD507 Voltage referenceD508 DCswitchD511 DC switchD512 Reverse currentpreventionD513~517 Surge absorptionD519 Surge absorptionD521 Surge absorptionD523,524 Surge absorptionD526,527 Surge absorptionD528,529 Reverse currentpreventionFinal Unit (X57-5610-XX) (C/3)-10 : TK-790/(B) K -11 : TK-790(B) K2Ref. No. Use/Function Operation/ConditionQ1 DC amplifier APC controllerQ2 APC controllerQ3,4 DC switchQ5 APC comparator APC controllerQ6 DC switchD1 Protection ofreverse connectionD2 Surge absorptionD3,4 ANT switchD5 Forward waverectificationD6 Reflected waverectification