Kenwood FM Transceiver TK-481 Service Manual

Also see for FM Transceiver TK-481: User manual Instruction manual Specifications Instruction manual Service manual

21TK-480/481Shift Register 1 : BU4094BCFV (TX-RX Unit IC18)Pin No. Port Port name Function1 STRB ES Strobe2 DATA DAT Data3 CLK CK Clock4 Q1 LEDR Red LED. H : On, L : Off5 Q2 LEDG Green LED. H : On, L : Off6 Q3 KEYBLT Key backlight. H : On, L : Off7 Q4 MMUTE MIC mute. H : Unmute, L : Mute8 VSS GND.9 QS IC18 data output.10 Q’S NC11 Q8 DTMPD DTMF decode IC power down.H : Power down, L : Busy12 Q7 Not used.13 Q6 5TC TX power control. H : RX, L : TX14 Q5 5RC RX power control. H : TX, L : RX15 OE OE Output enable.16 VDC 5M +5V.SEMICONDUCTOR DATAVCO System : KCH31, KCH32 (TX-RX Unit IC14) Circuit diagram3CV2MD1TAL1 C2 C8R2L2R4D2D3C1Q2 Q3C12D1C13C4C5R6R3C154 OUT5 GNDR7C9C10C116 5CR5R8L4R9L3Q1R1C17Q1 : 2SK1824Q2 : 2SC4226(R25)Q3 : 2SC5008D1 : HVC350BD2 : HVC202AD3 : MA2S077C14C16C7C6C3Shift Register 2 : BU4094BCFV (TX-RX Unit IC19)Pin No. Port Port name Function1 STRB ES Strobe2 DATA DAT Data3 CLK CK Clock4 Q1 AM1 Audio mute 1. H : Unmute, L : Mute5 Q2 LOK Link complete (Programmable active H/L).6 Q3 TA Talk around. H : Off, L : On7 Q4 NC8 VSS GND9 QS NC10 Q’S NC11 Q8 SQ External squelch (Programmable active H/L).12 Q7 CODE2 Option board data 2.13 Q6 CODE1 Option board data 1.14 Q5 OPT Option board control.Please set option board type in theKPG-49D. H : On, L : OffAuxiliary signal outut. Please set keyfunction in the KPG-49D (Program-mable active H/L).15 OE OE Output enable.16 VDC 5M +5V.