Tx-Rx Unit (X57-7210-20) - Kenwood TK-90 Service Manual

TK-90
Pin No. Name I/O
2 SP O Speaker output
CN2 (to TX-RX unit)
1 ME O GND for MIC
2 MIC O MIC input signal
3 E - GND
4 8D I 8V for circuit in Display unit
5 PSENSE O Panel connect check signal
6 RXD0 I Data input (UART)
7 PS O Power control signal
8 TXD0 O Data output (UART)
9 SB I Switched 13.6V
10 SP I Audio signal to internal speaker
11 SPG I GND for internal speaker
1 DM I/O MIC data detection
2 RXD1 I Data input for FPU
3 MIC I MIC signal input
4 ME I MIC GND
5 PTT/TXD1 I/O MIC standby signal (PTT) / Data output for FPU
6 E - GND
7 SB O Switched 13.6V for MIC
8 BLC O MIC backlight control

TX-RX Unit (X57-7210-20)

Pin No. Name I/O
CN6 (to CN for AT)
1 TT I/O External antenna tuner in/through control
2 TS I/O External antenna tuner tuning start control
3 GND - GND
CN7 (for KCT-31)
1 NC -
2 GND - GND
3 SB O Switched 13.6V
CN8 (for KCT-31)
1 NC -
2 RXD1 I Data input
3 TXD1 O Data output
CN9 (for KCT-39)
1 KEY I KEY signal input
2 NC -
3 GND - GND
90
TERMINAL FUNCTION /
Function
J1 (to MIC)
Function
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