Kenwood TK-90, Service Manual

Page: 89 / 142

TK-90
89
Final Unit (X45-3780-20)
Pin No. Name I/O Function
CN3 (to TX-RX unit)
1 8D I 8V AVR output for digital circuit
2 8A I 8V AVR output for analogue circuit
3 14S I Switched 13.6V
4 14V I 13.6V
5 14AF I Switched 13.6V for audio amplifier
6 14AG I GND for audio amplifier
7 GND - GND
8 GND - GND
CN4 (to TX-RX unit)
1 GND - GND
2 DAT I Data for shift-register in Final unit
3 CLK I CLK for shift-register in Final unit
4 FEN I EN for shift-register in Final unit
5 PSC I Power supply switch control signal
6 TH1 O Thermal protect detection voltage 1
7 TH2 O Thermal protect detection voltage 2
8 NC -
9 VSF O Forward power detected voltage
10 VSR O Reflected power detected voltage
11 NC -
12 ID+ O Drive current detection positive
13 ID- O Drive current detection negative
14 NC -
15 IC+ O Final transistor current detection positive
16 IC- O Final transistor current detection negative
17 NC -
18 TXB I TX 8V
19 NC -
20 5A I 5V for Final unit
21 NC -
22 GND - GND
CN6 (to CN for AT)
1 14AT O Power supply for EXT. AT
2 GND - GND
Display Unit (X54-3560-20)
Pin No. Name I/O Function
CN1 (to Internal SP)
1 SPG - Speaker GND
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