Kenwood TK-780 Service Manual Supplement

Also see for TK-780 series: Programming instructions Instruction manual Service manual Instruction manual Service manual

35TK-780/HDESCRIPTION OF COMPONENTSTX-RX Unit (X57-6480-XX) (A/2)-10 : K -11 : K2 -12 : HK -13 : HK2Ref. No. Use / Function Operation / ConditionIC1 DC amp FC, TCXO controlIC2 DET amp External DEO, internal DEOIC3 Amp/Summing amp DI / DI and MO addtionIC4 Analog switch DI switchIC5 A/D converter PC, TV, FC, AFO, BEEP, TO, MOcontrolIC6 DC amp PCIC7 Shift register HNC, H/L, TOF, CODE3, CODE4,PA, BUSY, W/N controlIC8 Shift register AM, LOK, STR, DM, OPT, CODE1,CODE2, SQ controlIC9 5V AVR External 5CIC10 AF power ampIC11 FM IF DET Quadrature detector, 2nd mixer,OSC, IF amplifier, RSSIIC12 5V AVR 5CIC13 9V AVR 9CIC14 8V AVR 8CIC15 Flip-flop Power controlIC201 DC amp TVIC202 Mixer DBMIC300 PLL Reference 16.8MHz.PLL lock : LD “H”IC400 Power module RF power 25WIC401 TX power ampQ1 DC switch R17 connection and, PTT “H” timeDI offQ2 Ripple filter 8CLQ3 Ripple filter 9CLQ4 HOR switch IGNQ5 HOR SW control IGNQ6 HOR SW control HNC “H” time onQ7 Buffer amp HTQ8 AF mute AM “H” time onQ9 AF mute Power off time onQ10 8R SW control TR “H” time onQ11 8R switch Q10 on time onQ12 8T switch Q13 on time onQ13 8T SW control KEY “H” time onQ15 IF amp 44.85MHzQ16 DET output level Wide time onswitchQ17 PC switch TX (8T) time onRef. No. Use / Function Operation / ConditionQ18 DET mute KEY “H” time onQ19 APC APC driverQ20 APC APC pre-driverQ21 APC controlQ22 TOF switch TOF “H” time onQ23 W/N switch Wide time offQ24 W/N switch Wide time onQ25 TOF switch Q22 on time onQ26 Inverter Power switch “L” time onQ27 SB switch Q28 on time onQ28 SB SW control Q30 on and Q31 off time onQ29 H/L switch High power time “H”Q30 SB SW control Power on time onQ31 SB SW control DC 20V and over time onQ32 DET mute TX time onQ33 Temperature protectionQ202 LNAQ203 RF amp TX drive firstQ204 RF amp TX drive lastQ300 Buffer amp PLLQ301,302 Active filterQ401 Short protection IC400 out short time onQ402 W/N switch Wide time offQ403 W/N switch Wide time onD1~6 ProtectionD7 HOR protectionD8,9 ProtectionD11 OR gate AF muteD12~14 ProtectionD15 HT switchD16 Reverse protectionD17 ProtectionD20 Reverse protection IGND21 Protection 5V (IGN)D22,23 W/N CF changeD24 Over currentprotectionD26 Reverse protectionD27 Power detectionD28 ProtectionD30 Power detectionD31 Reverse protectionD32 Surge absorption BD34 Protection DC 20V and over time onD35 Charge DEO