Kenwood FM Transceiver TK-481 Service Manual page 22

Shift Register 1 : BU4094BCFV (TX-RX Unit IC18)
Pin No. Port Port name
1 STRB ES Strobe
2 DATA DAT Data
3 CLK CK Clock
4 Q1 LEDR Red LED. H : On, L : Off
5 Q2 LEDG Green LED.
6 Q3 KEYBLT Key backlight. H : On, L : Off
7 Q4 MMUTE MIC mute. H : Unmute, L : Mute
8 VSS GND.
9 QS IC18 data output.
10 Q'S NC
11 Q8 DTMPD DTMF decode IC power down.
H : Power down, L : Busy
12 Q7 Not used.
13 Q6 5TC TX power control. H : RX, L : TX
14 Q5 5RC RX power control. H : TX, L : RX
15 OE OE Output enable.
16 VDC 5M +5V.
VCO System : KCH31, KCH32 (TX-RX Unit IC14)
Circuit diagram
CV
MD
TA
SEMICONDUCTOR DATA
Function
H : On, L : Off
C2
L1
3
R2
2
R1
1
Q1
Q1 : 2SK1824 D1 : HVC350B
Q2 : 2SC4226(R25) D2 : HVC202A
Q3 : 2SC5008 D3 : MA2S077
Shift Register 2 : BU4094BCFV (TX-RX Unit IC19)
Pin No. Port Port name
1 STRB ES
2 DATA DAT
3 CLK CK
4 Q1 AM1
5 Q2 LOK
6 Q3 TA
7 Q4
8 VSS
9 QS
10 Q'S
11 Q8 SQ
12 Q7 CODE2
13 Q6 CODE1
14 Q5 OPT
15 OE OE
16 VDC 5M
C8
Q2 Q3
C12
R4
R5
TK-480/481
Function
Strobe
Data
Clock
Audio mute 1. H : Unmute, L : Mute
Link complete (Programmable active H/L).
Talk around. H : Off, L : On
NC
GND
NC
NC
External squelch (Programmable active H/L).
Option board data 2.
Option board data 1.
Option board control.
Please set option board type in the
KPG-49D. H : On, L : Off
Auxiliary signal outut. Please set key
function in the KPG-49D (Program-
mable active H/L).
Output enable.
+5V.
4 OUT
C15
5 GND
6 5C
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