Kenwood TK-280 Service Manual

Also see for TK-280: User manual Instruction manual Instruction manual Pricing and specification manual Service manual

Contents

TK-28052TERMINAL FUNCTIONCN1 1 B O Power input after passing throughthe fuse.2 B O Power input after passing throughthe fuse.3 SB I Power output after power switch.4 SB I Power output after power switch.5 5M O 5V.6 VOL I V o l u m e l e v e l i n p u t f o r a u d i ocontrol.7 E - GND8 EN2 I Encoder pulse input.9 E - GND10 EN1 I Encoder pulse input.CN2 1 MON I N o r m a l l y ; 5 V . M O N w h e nfor X54- connected GND.SW 2 LAMP I N o r m a l l y ; 5 V . L A M P w h e nsection connected GND.3 PTT I N o r m a l l y ; 5 V . t r a n s m i t w h e nconnected GND.4 GND - GNDCN3 1 AF O Audio output.2 AFE - Audio GND.for 3 NC - Not use.X54- 4 PF I External PF signal input.Display 5 CK O Clock data output.unit 6 RXD I Serial control signal input.7 TXD O Serial control signal output.8 DT O Data output for LCD driver/decadecounter.9 KRS O Key scan IC reset output.10 KI1 I KEY input11 KI2 I KEY input12 GND - GND13 5M O 5V.14 AM O Audio mute signal output.Mute: “L”. Unmute: “H”15 CS O LCD driver chip select output.16 NC - Not use.17 PTT I PTT signal input.18 AUX I AUX key input.19 LR O TX LED control. Normally: 0V,lighting: 5V.20 LG O RX LED control. Normally: 0V,lighting: 5V.21 LBL O Backlight LED control.Normally: 0V, lighting: 5V.22 ME - MIC GND.23 MIC I MIC signal input.24 SB O Power output after power switch.CN300 1 SB I Power input after power switch.2 MIC O MIC signal output.for 3 ME - MIC GND.X57- 4 LBL I Backlight LED control.TX-RX Normally: 0V, lighting: 5V.unit 5 LG I RX LED control. Normally: 0V, lighting: 5V.6 LR I TX LED control. Normally: 0V, lighting: 5V.7 AUX O AUX key output.CN No. Pin No. Name I/O FunctionDISPLAY UNIT (X54-3210-12 A/2) : DISPLAY sectionTX-RX UNIT (X57-6192-70): TX-RX section 8 PTT O PTT signal output.9 NC - Not use.10 CS I LCD driver chip select input.11 AM I Audio mute signal input.Mute: “L”, Unmute: “H”12 5M I 5V.13 GND - GND14 KI2 O KEY output15 KI1 O KEY output16 KRS I Key scan IC reset input17 DT I Data input for LCD driver/decade counter.18 TXD I Serial control signal input.19 RXD O Serial control signal output.20 CK I Clock data input.21 PF O External PF signal output.22 NC - Not use.23 AFE - Audio GND.24 AF I Audio input.CN301 1 SSW I EXT/INT speaker switch input.2 SP+ O BTL output + for external speaker.3 SP- O BTL output - for external speaker.4 MSW I EXT/INT MIC switch input.5 EMC I External microphone input.6 ME - External microphone ground.7 PTT I External PTT input.8 PF I Programmable function key input.9 NC - Not use.10 E - GND11 5M O 5V output12 TXD O Serial data output.13 RXD I Serial data input.14 NC (E) - Not use (GND)CN302 1 SP O Output for internal speaker.2 E - GNDCN304 1 NC - Not use.2 LEDK I Backlight LED control.3 LEDA O Backlight LED control.4 VCI O LCD power supply.5 SOD O Serial data output for LCD driver.6 SID I Serial data input for LCD driver.7 SCLK O Clock data output for LCD driver.8 CS O LCD driver chip select output.9 Vcc O 5V10 GND - GNDCN303 1 MON O Normally; 5V.,MON when connected GND.For X57- 2 LAMP O Normally; 5V, LAMP when connected GND.TX-RX 3 PTT O Normally; 5V, transmit when connected GND.unit 4 GND - GNDCN No. Pin No. Name I/O FunctionDISPLAY UNIT (X54-3210-12 B/2) : SW section