Terminal Function - Kenwood FM Transceiver TK-481 Service Manual

TK-480/481
CN No. Pin No. Name I/O
TX-RX UNIT (X57-5630-XX) : TX-RX section
CN1 1 B O Power input after passing through the fuse.
2 B O Power input after passing through the fuse.
3 SB
4 SB
5 5M O 5V.
6 VOL
7 E
8 EN2
9 E
10 EN1
CN2 1 MON
for X54- 2 LAMP
SW 3 PTT
section 4 GND
CN3 1 AF O Audio output.
2 AFE
for 3 NC
X54- 4 PF
Display 5 CK O Clock data output.
unit 6 RXD
7 TXD O Serial control signal output.
8 DT O Data output for LCD driver/decade counter.
9 KRS O Key scan IC reset output.
10 KI1
11 KI2
12 GND
13 5M O 5V.
14 AM O Audio mute signal output.
15 CS O LCD driver chip select output.
16 NC
17 PTT
18 AUX
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.
22 ME
23 MIC
24 SB O Power output after power switch.
DISPLAY UNIT (X54-3210-XX A/2) : DISPLAY section
CN300 1 SB
2 MIC O MIC signal output.
for 3 ME
X57- 4 LBL
TX-RX
unit 5 LG
6 LR
7 AUX O AUX key output.
40

TERMINAL FUNCTION

Function
I Power output after power switch.
I Power output after power switch.
I Volume level input for audio control.
– GND
I Encoder pulse input.
– GND
I Encoder pulse input.
I Normally;5V, MON when connected GND.
I Normally;5V, LAMP when connected GND.
I Normally;5V, transmit when connected GND.
– GND
– Audio GND.
– Not use.
I External PF signal input.
I Serial control signal input.
I KEY input
I KEY input
- GND
Mute:"L", Unmute:"H"
– Not use.
I PTT signal input.
I AUX key input.
Normally:0V, lighting:5V.
– MIC GND.
I MIC signal input.
I Power input after power switch.
– MIC GND.
I Backlight LED control.
Normally:0V, lighting:5V.
I RX LED control. Normally:0V, lighting:5V.
I TX LED control. Normally:0V, lighting:5V.
CN No. Pin No. Name I/O
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 – GND
14 KI2 O KEY output
15 KI1 O KEY output
16 KRS I Key scan IC reset input
17 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 – GND
11 5M O 5V output
12 TXD O Serial data output.
13 RXD I Serial data input.
14 NC – Not use
CN302 1 SP O Output for internal speaker.
2 E – GND
CN304 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 5V
10 GND – GND
DISPLAY UNIT (X54-3210-XX B/2) : SW section
CN303 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 – GND
Function