Kenwood TK-790 Service Manual

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

33TK-790/(B)/H(B)Microprocessor : 78064GCXXX8EU (Display Unit IC4)• Terminal functionPin No. Pin name I/O Action74 Not used75 RXD I Serial interface RXD76 TXD O Serial interface TXD77 Not used78 – GND79 X2 – X’tal 4.19MHz80 X1 – X’tal 4.19MHz81 VDD – +5V82,83 Not used84 RST – Reset85 END I Encoder data86 K3 I [GR ] Key L : ON, H : OFF87 K4 I [GR ] Key L : ON, H : OFF88 ENI I Encoder interrupt89 TEST I Serial interface test90 AO2 O Programable AUX output B91 AO1 O Programable AUX output A92 AI2 I Programable AUX input B93 AI1 I Programable AUX input A94 BLC O MIC backlight ON/OFFL : ON, H : OFF95,96 Not used97 DM I DTMF MIC key pad data input98 HK I MIC hook L : ON, H : OFF99 AVSS – GND100 VOL I AF volumePin No. Pin name I/O Action1 PTT I MIC PTT L : ON, H : OFF2 K5 I [MON] key L : ON, H : OFF3 K6 I [PF6] key L : ON, H : OFF4 K7 I [PF1] key L : ON, H : OFF5 K8 I [PF2] key (Full) L : ON, H : OFF6 K9 I [PF3] key (Full) L : ON, H : OFF7 K10 I [PF7] key (Full) L : ON, H : OFF8 AVDD – +5V9 AVREF – +5V10 RED O TX LED (Red) L : ON, H : OFF11 GRN O BUSY LED (Green) L : ON, H : OFF12 E – GND13 DM1 O Backlight (Dimmer)14 DM2 O Backlight (Dimmer)15 I Not used16 K11 I [SCN] key (Full) L : ON, H : OFF17 K12 I [PF8] key (Full) L : ON, H : OFF18 K13 I [PF9] key (Full) L : ON, H : OFF19 K1 I [PF4] key L : ON, H : OFF20 K2 I [PF5] key L : ON, H : OFF21 1/2 I HEAD 1/2 jumperHEAD 1 : Jumper installed,HEAD 2 : Jumper removed22 B/F I Panel type JumperBasic panel : Jumper installed.Full panel : Jumper removed23~26 COM0~3 O LCD drive common 0~327 BIAS LCD drive bias28~30 VLC0~2 LCD drive power suply31 VSS GND32~67 S0~35 O LCD drive segment 0~3568 S36 O LCD drive segment 36 (Basic)CE DOT matrix driver CE (Full)69 S37 O LCD drive segment 37 (Basic)CL DOT matrix driver CL (Full)70 S38 O LCD drive segment 38 (Basic)DI DOT matrix driver DI (Full)71 S39 O LCD drive segment 39 (Basic)DO I DOT matrix driver DO (Full)72 SCK O EEPROM serial clock73 SDT I/O EEPROM serial dataSEMICONDUCTOR DATAShift Register Output• Shift register 1 on control unit (IC523)Pin No. Port Name Action4 Q1 PTO GE-STAR/Scrambler PTO5 Q2 BC4 Scrambler BC46 Q3 BC3 Scrambler BC37 Q4 BC2 Scrambler BC214 Q5 AC Scrambler AC13 Q6 BC1 Scrambler BC112 Q7 HR Acc HR11 Q8 CMP Compander H : ON, L : OFF><