Kenwood TK-790 Service Manual

Also see for FleetSync TK-790: Specifications Instruction manual Specifications Instruction manual

32TK-790/(B)/H(B)Pin No. Pin name I/O Action1 FCLR O Modem FCLR2 CK O Common CLOCK3 EM O D/A converter CS4 MSKE O Modem MSKE5 DIN O Modem DIN6 EP O PLL LE7 SCL O DTMF encoder CLOCK8 SDT O DTMF encoder DATA9 VDD +5V10,11 X2, X1 X’tal12 VSS GND13 XT2 Open14 XT1 GND15 RESET CPU reset16 TEST I Serial interface TEST17 TRD I Modem TRD18 RTM I Modem RTM19 STD I DTMF decoder STD20 EC2 O Shift register 2 (Control) CS21 DT O Common DATA22 ACK O DTMF decoder CLOCK23 AVDD +5V24 AVREF0 +5V25 TI I QT/DQT IN26 RSI I RSSI IN27 ASQ I Analog squelch IN28 UL I PLL UNLOCK29 SD I DTMF decoder SD30 RDT I Modem RDT31 RSV2 I Reserved32 IGN I Ignition IN33 AVSS GND34 TO O QT/DQT OUT35 CP O PLL CLOCK36 AVREF1 +5V37 RXD2 I Acc RXD38 TXD2 O Acc TXD39 ES O Shift register (TX/RX) CSMicroprocessor : 784214GCXXX8EU (Control Unit IC516)• Terminal functionPin No. Pin name I/O Action40 RXD1 I Serial interface RXD41 TXD1 O Serial interface TXD42 STB O Modem STB43 EC1 O Shift registerl (Control) CS44 EI O Shift register (Interface) CS45 SEL I/O GE-STAR I/O46 EPT I GE-STAR EPT47 EMG O GE-STAR EMG48~71 Flash ROM access port72 VSS GND73~74 Flash ROM access port75 Flash ROM (4Mbit) access port76 Not used.77~78 Flash ROM access port79 POF O Timed Power OFF.80 Not used.81 VDD +5V82 EN2 O D/A converter (Interface) CS83 CLK O EEPROM CLOCK84 SDA I/O EEPROM DATA85 RSV1 O Reserved86 AI1 I Acc PF Input 187 AI2 I Acc PF Input 288 AI4 I Acc PF Input 489 AI3 I Acc PF Input 390 AI5 I Acc PF Input 591 2TN I 2tone pulse IN92 KEY O TX power SW93 SQ O Acc SQ OUTL : BUSY, H : Not BUSY94 TEST GND95 AO1 O Acc PF Output 196 AO2 O Acc PF Output 297 AO3 O Acc PF Output 398 AO4 O Acc PF Output 499 1/2 I Deck 1/2L : Deck 1, H : Deck 2100 SFT O Beat shiftSEMICONDUCTOR DATA