Kenwood TK-780 Service Manual Supplement page 34

TK-780/H
Shift Register : BU4094BCFV
Terminal function (TX-RX unit (B/2) IC508)
Pin No. Port Name
1 ES ES1
2 DT DAT
3 CK
4 Q1 LEDR
5 Q2 LEDG
6 Q3 KEYBLT
7 Q4 MMUTE
8 VSS
9
10
11 Q8 PA2
12 Q7 BSHIFT
13 Q6 KEY
14 Q5 T/R
15 OE
16 VDC
Terminal function (TX-RX unit (A/2) IC8)
Pin No. Port Name
1 STB ES
2 SI DT
3 CLK CK
4 Q1 AM1
5 Q2 LOK
6 Q3 STR
7 Q4 DM
8 VSS
9 QS
10
11 Q8 SQ
12 Q7 CODE2
13 Q6 CODE1
14 Q5 OPT
15 OE
16 VDC
34
SEMICONDUCTOR DATA
Function
Strobe
Data
Clock
Red LED. H : ON, L : OFF
Green LED. H : ON, L : OFF
Key back light. H : ON, L : OFF
MIC mute. H: Mute, L : Unmute
GND
NC
NC
Public address 2. H : ON, L : OFF
Beat shift. H : ON, L : OFF
TX power switching. H : TX, L : RX
TX/RX switching. H : RX, L : TX
Output enable
+5V
Function
Strobe
DATA
Clock
Audio mute 1. H : Mute, L : Unmute
Link complete.
(Programmable active H/L)
VCO shift switching. H : TX, L : RX
Dead mute. H : RX, L : TX
GND
IC7 data output
NC
External squelch.
(Programmable active H/L)
Option board data 2. H : ON, L : OFF
Option board data 1. H : ON, L : OFF
Option board control.
H : ON, L : OFF / Auxiliary B.
(Programmable active H/L)
Output
+5V.
Terminal function (TX-RX unit (A/2) IC7)
Pin No. Port Name
1 STB ES Strobe
2 SI DT Data
3 CLK CK Clock
4 Q1 HORN Horn alert. H : ON, L : OFF /
Auxiliary A. H : ON, L : OFF
5 Q2 HL RF power switching. H : High, L : Low
6 Q3 TIMOFF Timed power off. H : Power off
7 Q4 CODE3 Option board data 1. H : ON, L : OFF
8 VSS GND
9 NC
10 NC
11 Q8 W/N Wide/Narrow switching.
H : Wide, L : Narrow
12 Q7 BUSY Trunked system busy.
H : Not busy, L : Busy
13 Q6 PA1 Public address 1. H : ON, L : OFF
14 Q5 CODE4 Option board data 1. H : ON, L : OFF
15 OE Output enable
16 VDC +5V
Function