Kenwood TK-390 Service Manual

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Contents

23TK-3901. Microprocessor : MC-8800-802 (TX-RX Unit IC406)1-1. Terminal functionPin No. Port name I/O Function1~4 A7~A4 I NC : Flash memory address bus5~7 AD5~AD3 I/O NC : Flash memory address and data bus8~11 A3~A0 I NC : Flash memory address bus12 Vcc – +5V.13 OE I GND : Address latch output enable14 VSS I GND : Test port15~18 CH A~CH D I Rotary SW 1~419 TGL I Toggle switch input20 LE O PLL enable21 DATA O Common data22 CLOCK O Common clock23 VOL I Volume level input24 PF I SP key 1/225 TEMP I TEMP26 LSDIN I Low speed data input (QT/DQT)27 BATT I Battery voltage input28 UL I PLL unlock detect input29 GND – GND30 MDATA O Modem data input31 EXSP I EXT SP Connect : L, Non connect : H32 AVDD – +5V33 AVREF1 – +5V34 AVSS – GND35 LSDOUT O Low speed data output (QT/DQT)36 HSDOUT O High speed data output (DTMF/Beep)37 AVREF2 – +5V38 AVREF3 – GND39 SELF I Self programming enable/disableH : Enable, L : Disable40 INTP0 I μ-com stop41 STD I DTMF decoder STD42 BUSY I Noise pulse input43 2TONE I 2 tone data input44 TRD I MSK modulation data output timingpulse input45 RTM I MSK demodulation data input timingpluse input46 SD I DTMF decoder SD47 RXD I Serial interface input48 TXD O Serial interface outputPin No. Port name I/O Function49 DCK O DTMF clock50 SCL O EEPROM clock51 GND – GND52 SDA I/O EEPROM data53 LD O DA converter LD54 MSTB O MSK modulation strobe55 MSKE O MSK modulation enable56 RESET I μ-com reset Active : L57,58 X2, X1 – 14.754MHz (System clock)59 FCLR O MSK flame reset output60 RDT I MSK demodulation data input61,62 STB2, STB1 O Shift register strobe 2, 163 SOE O Shift register output enable64 PTT I PTT key input65 LCDCS O LCD driver chip select output66,67 KEY2, KEY1 I Key counter return 2, 168 LCDDO I Radio kill data input for optional board69 KCK O Key counter clock output70 KRST O Key counter reset output71 A10 I/O NC : Not used72 RD O Flash ROM read bus73 OE I Flash ROM output enable74 A17 I/O Flash memory address and data bus75 CE I Flash memory chip enable76 A11 I/O NC77 A14 I/O NC78,79 – – NC : Not used80 GND – GND81,82 A9, A8 I/O NC83,84 A13, A14 I/O NC85 WR O Flash ROM write bus86 Vcc – +5V87,88 A16, A15 I/O A16, A1589,90 A16, A15 I A16, A15 : Flash memory address bus91 A12 I/O NC92 NC – NC : Not used93~95 AD2~AD0 I/O NC96,97 AD7, AD6 I/O NC98,99 GND – GND100 ASTB I/O NC : Flash memory address strobeSEMICONDUCTOR DATA