Kenwood TK-701S Service Manual page 50

TK-701S
TX-RX UNIT
Terminal functions
Connector| Terminal | Terminal Terminal function
No. No. name
J21 1 TXO Transmit signal input from PLL unit
2 GND GND
J22 1 BZ Voice signal output
2 GND GND
3 RXO Receive signal input from PLL unit
J23 1 ESP External speaker line output
2 C8 8V common power source line
: 3 SB Switched Bt to regulated power source
4 KEY TX/RX data output (L when transmit-
| ting; H when receiving)
5 R8 8V when receiving
6 T8 8V when transmitting
7 AVO Voice signal output from AF volume
cont. |
8 AVI Voice signal input to AF volume cont.
SS) AFO Voice signal output
10 NSO Noise squelch signal output
11 NSI Noise squelch signal input
12 AFI Voice signal input
13 MUT Mute signal input
14 QTD Quiet Tone Disable output
15 AC Audio control output
16 UNL Unlock signal input
J24 1 B B+ line to transmit final stage
2 B Bt line to transmit final stage
3 B Bt line to transmit final stage
4 B Bt line to transmit final stage
J25 1 LMP(RED)| Channel illumination lamp ©
2 GND(BLK)} GND ©
J26 1 COM(BRN)| Common power source for LED
2 BSY(RED)} BUSY indication LED
3 CAL(ORG)| Call indication LED
4 TX(YEL) | TX indication LED
5 GND(BLK)} GND
2SA1015 2SK125
2SC1815
2SC2570A
25C2538
a
2SC2539 i
2SC3020
2SC3022
TX-RX UNIT (X61-1200-XX)
Printed Circuit Board
[Component side view]
Foil side
Component side