Kenwood TK-860G Service Manual Supplement page 6

TK-860G/862G
Modifying the Transceiver
• Horn alert
The signal from pin 4 of IC9 on the TX-RX unit turns Q5
and Q1 on and off and drives KAP-1 HA relay K2 to drive the
horn with a maximum of 2A.
The default output is HR1. The relay open output can be
obtained between HR1 and HR2 by removing R1 in the KAP-
1.
HR1 (Default)
HR2
Fig. 4 KAP-1 foil side view
TX-RX UNIT
IC9
Shift
Q5
register
4
Q1
Q6
13
Q6
IGN
Audio
power amp
IC13
+
6
INSTALLATION
R1 Output form
Enable
HR1
Disable
HR1
HR2
8C
Q1
CN3 W1
HOR
E
D2
SB
CN7
W2
PA/LI
SPO
SPI
CN8
Internal/External
speaker
• Public address
The signal from pin 13 of IC9 on the TX-RX unit drives PA
relay K1 in the KAP-1 and switches the audio power ampli-
fier output between the external PA system (through KCT-
19) and internal and external speakers.
To use the PA function, R153 on the TX-RX unit must be
removed.
Use the PA function
Do not use the PA function
KCT-19
Q19
Others
If the PA and HR2 are not necessary and the speaker out-
put is output to an external unit through the KCT-19, connect
the KCT-19 C connector to CN8 on the TX-RX unit.
KAP-1 (SWITCH UNIT : X41-3380-20)
Q1 : DTD114EK
D1,2 : 1SS193
1
2
3
C3 0.01
K1
R3 0
R4 0
Q1
1
2
3
C4 0.01
Fig. 6
R153
Disable
Enable
TX-RX UNIT
(A/2)
CN2
Fig. 5
C
CN1
1
HR2
2
NC
K2
CN2
1
HR1
2
E
+
3
SB
B
D1
C
CN3
1
PAO/LIO
2
E
KCT-19 Terminal
+
D2
ANT
GRN
KCT-19
BRN
ORG
YEL
GRN
13 10 1
15 12 6 3
6 : Earth
10 : HR1
12 : PA (HR2)