Kenwood TS-990S Service Manual
Also see for SP-990: Instruction manual
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TS-990S65SEMICONDUCTOR DATAExtension Port IC: TC74VHC373FT(Control unit IC32)Pin No. Name I/O Function1 OE I Output enable2 ACDCSW O AC/DC power controlH: Active3 D0 I Data bit 04 D1 I Data bit 15 LPOFF O Standby LED controlH: light6 LTIMER O Timer LED controlH: light7 D2 I Data bit 28 D3 I Data bit 39 NBS O NB ON/OFFH: NB ON10 GND - GND11 LE I Latch enable12 LCDREQ O LCD active request to application MCUH: Active13 D4 I Data bit 414 D5 I Data bit 515 MIBK O Main RX IF blankingH: Mute16 SIBK O Sub RX IF blanking signalH: Mute17 D6 I Data bit 618 D7 I Data bit 719 50VSW O Power switch control for 50VH: Active20 VCC - 3.3VExtension Port IC: TC74VHC373FT(Control unit IC33)Pin No. Name I/O Function1 OE I Output enable2 REN1 O Shift register enable signal for RX unit3 D0 I Data bit 04 D1 I Data bit 15 REN2 O Shift register enable signal for RX unit6 PSEN O Shift register enable signal for preselec-tor7 D2 I Data bit 28 D3 I Data bit 39 PSEEN O EEPROM enable (preselector)10 GND - GND11 LE I Latch enable12 DAEN1 O D/A convertor IC enable for RX unit13 D4 I Data bit 4Pin No. Name I/O Function14 D5 I Data bit 515 MRXC O Main RX control signalH: RX/ L: TX16 RPEN O Reference PLL enable17 D6 I Data bit 618 D7 I Data bit 719 REFI O External ref. input selectH: External ref. input20 VCC - 3.3VExtension Port IC: TC74VHC373FT(Control unit IC34)Pin No. Name I/O Function1 OE I Output enable2 MANO-MU O Main ANO mute control signalH: Main ANO mute3 D0 I Data bit 04 D1 I Data bit 15 SANOMU O Sub ANO mute control signalH: Sub ANO mute6 PKP O Invert PKS control signalH: PTT ON7 D2 I Data bit 28 D3 I Data bit 39 TEN1 O Shift register enable signal for TX-RXunit10 GND - GND11 LE I Latch enable12 TEN2 O Shift register enable signal for TX-RXunit13 D4 I Data bit 414 D5 I Data bit 515 DAEN2 O D/A converter enable signal for TX-RXunit16 MSQC O Main squelch control signal (to ACC2)H: Main squelch open17 D6 I Data bit 618 D7 I Data bit 719 SSQC O Sub squelch control signal (to ACC2)H: Sub squelch open20 VCC - 3.3VExtension Port IC: TC74VHC373FT(Control unit IC36)Pin No. Name I/O Function1 OE I Output enable2 ADC1 O Multiplexer control signal 1 |
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