Kenwood Tk 780h1 Owners Manual
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Page 31
31 TK-780 / H Display Circuit The CPU (IC511) controls the shift register (IC508) and display LEDs. When the LG line goes high when the trans- ceiver is busy, Q508 turns on and the green LED on D511 lights. In transmit mode, the LR line goes high, Q509 turns on and the red light lights. Backlighting LEDs for the key operation unit (D512~D517) and LCD are provided. When the KBLC line goes high, Q512 turns on, then Q513 turns on, and the key illumination LED lights. A volt- age is applied to the LEDA...
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32 TK-780/ H CIRCUIT DESCRIPTION Horn Control The horn switch, consisting of Q4, Q5, and Q6, controls the horn relay. It is supplied by the dealer to provide the external horn alert function. Q5 disables horn alert, turning on when its base is high, to inhibit the function. Normally, the output from IC7 is low, and Q6 is off; the base of Q4 is about 0V and Q4 is off. When horn alert is enabled, the output from IC7 goes high and Q6 turns on. The base current flows through R58 to Q4 to turn Q4 on. Q4...
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33 TK-780 / H SEMICONDUCTOR DATA Terminal function Pin No. Name I/O Function 1 LSDOUT O Low speed data output. 2 HSDOUT O High speed data output. 3 HSDIN I High speed data input. 4 DTMSTD I DTMF decode IC data detect input. 5 SELF I Self programming mode input. 6 BYTE I +5V. 7 CNVSS I GND. 8 SFTOE O Shift register output enable. 9 LCDCS O LCD driver chip select output. 10 RESET I Microcomputer reset input. 11 XOUT – 9.8304MHz (System clock). 12 VSS – GND. 13 XIN – 9.8304MHz (System clock). 14 VCC –...
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34 TK-780/ H SEMICONDUCTOR DATA Shift Register : BU4094BCFV Terminal function (TX-RX unit (B/2) IC508) Pin No.Port Name Function 1 ES ES1 Strobe 2 DT DAT Data 3 CK Clock 4 Q1 LEDR Red LED. H : ON, L : OFF 5 Q2 LEDG Green LED. H : ON, L : OFF 6 Q3 KEYBLT Key back light. H : ON, L : OFF 7 Q4 MMUTE MIC mute. H: Mute, L : Unmute 8 VSS GND 9NC 10 NC 11 Q8 PA2 Public address 2. H : ON, L : OFF 12 Q7 BSHIFT Beat shift. H : ON, L : OFF 13 Q6 KEY TX power switching. H : TX, L : RX 14 Q5 T/R TX/RX...
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35 TK-780 / H DESCRIPTION OF COMPONENTS TX-RX Unit (X57-6480-XX) (A/2) -10 : K -11 : K2 -12 : HK -13 : HK2 Ref. No. Use / Function Operation / Condition IC1 DC amp FC, TCXO control IC2 DET amp External DEO, internal DEO IC3Amp/Summing ampDI / DI and MO addtion IC4 Analog switch DI switch IC5 A/D converter PC, TV, FC, AFO, BEEP, TO, MO control IC6 DC amp PC IC7 Shift register HNC, H/L, TOF, CODE3, CODE4, PA, BUSY, W/N control IC8 Shift register AM, LOK, STR, DM, OPT, CODE1, CODE2, SQ control IC9 5V AVR...
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36 TK-780/ H Ref. No. Use / Function Operation / Condition D36Temperature protection D37Reverse protection D206~208Front tune D209,210Usable temperature range D211 ANT swtich TX time on D212 ANT switch D213 Over voltage protection TX-RX Unit (X57-6480-XX) (B/2) -10 : K -11 : K2 -12 : HK -13 : HK2 Ref. No. Use / Function Operation / Condition IC501LPF, amplificationLSD IC502 Amplification AF, HSD IC503 Base voltage/ ASQ Buffer amp IC504 Audio processor Compander, MIC amplifier, ALC, Modem, AF filter, IDC...
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37 TK-780/H PARTS LIST 2nd Word G H J K L ppm/°C±30±60±120±250±500 Example : CC45TH = –470 ± 60ppm/°C Multiplier 2nd number 1st number 2 2 0 = 22pF CAPACITORSCC 45 TH 1H 220 J 12 3 4 56 1 = Type … ceramic, electrolytic, etc. 4 = Voltage rating 2 = Shape … round, square, ect. 5 = Value 3 = Temp. coefficient 6 = Tolerance • Temperature coefficient 1st Word C L P R S T U Color* Black Red Orange Yellow Green Blue Violet ppm/°C 0 –80 –150 –220 –330 –470 –750 • Tolerance (More than 10pF) Code C D G J K M X...
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TK-780/ H PARTS LIST 38 *New Parts. indicates safety critical components. Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Teile ohne Parts No. werden nicht geliefert.L: ScandinaviaK: USAP: Canada Y: PX (Far East, Hawaii)T: EnglandE: Europe Y: AAFES (Europe)X: AustraliaM: Other Areas TK-780/H TX-RX UNIT (X57-6480-XX) NewDesti-partsnation Ref. No.AddressParts No. DescriptionNewDesti-partsnation Ref. No.AddressParts No. Description 1 1A...
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TK-780/ H PARTS LIST 39 Ref. No.AddressParts No. Description Ref. No.AddressParts No. DescriptionNewDesti-partsnationNewDesti-partsnation C84 CC73GCH1H080D CHIP C 8.0PF D C87 CK73GB1H471K CHIP C 470PF K C88 CK73GB1E103K CHIP C 0.010UF K C89 CK73GB1H471K CHIP C 470PF K C90 CK73GB1H102K CHIP C 1000PF K C91,92 CK73GB1E103K CHIP C 0.010UF K C93 CK73GB1H102K CHIP C 1000PF K C94 CK73GB1H471K CHIP C 470PF K C95 CC73GCH1H150J CHIP C 15PF J C96 CC73GCH1H180J CHIP C 18PF J C97 CK73GB1H102K CHIP C 1000PF K C98...
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TK-780/ H PARTS LIST 40 Ref. No.AddressParts No. Description Ref. No.AddressParts No. DescriptionNewDesti-partsnationNewDesti-partsnation C251 C93-0558-05 CHIP C 8.0PF D K C251 C93-0561-05 CHIP C 12PF J HK C251 C93-0562-05 CHIP C 15PF J HK2 C251,252 C93-0561-05 CHIP C 12PF J K2 C252 C93-0553-05 CHIP C 3.0PF C K C252 C93-0556-05 CHIP C 6.0PF D HK C252 C93-0561-05 CHIP C 12PF J HK2 C253 C93-0603-05 CHIP C 1000PF K C254 C93-0564-05 CHIP C 22PF J HK C254 C93-0565-05 CHIP C 27PF J K2,HK2 C254 C93-0666-05 CHIP...