Kenwood TK-280 Service Manual page 27

Shift register 2 : BU4094BCFV (TX-RX UNIT : IC22)
Pin function
Pin
Port Port Name
No.
1 ES ES Strobe
2 DT DAT Data
3 CK Clock
4 Q1 AM1 Audio mute 1.
5 Q2 LOK TX Logic Signal output. Active logic level is Low. Logic
type can select "TX Line" or "Mic PTT" in the
KPG-60D.
6 Q3 T/R TX/RX switching.
7 Q4 DM Dead mute.
8 VSS GND
9 NC
10 NC
11 Q8 SQ Squelch signal output. Signal logic type can select "Carrier
Operate Relay" or "Tone Operate Relay" in the
KPG-60D. Active logic level is Low.
12 Q7 CODE2 Option board data 2. H : ON, L : OFF
13 Q6 CODE1 Option board data 1. H : ON, L : OFF
14 Q5 OPT - Option board control. Please set option board type
in the KPG-60D. H : ON, L : OFF
- Auxiliary signal output. Please set key function in
the KPG-60D.
15 OE Output enable
16 VDC +5V
SEMICONDUCTOR DATA
Function
H : Unmute, L : Mute
H : RX, L : TX
H : RX, L : TX
TK-280
27