Kenwood TK-760G Service Manual page 20

TK-760G/ ( N
Operation when KCT-18
is connected
Power on/off and Horn Disable Enable
Alert or AUX-A on/off
Horn Alert or AUX-A
on/off
Table 1 R134 and R135 setup chart
4. PA/HA Unit (KAP-1 : Option)
4-1. Installing the KAP-1 in the Transceiver
The Horn Alert (max. 2A drive) and Public Address func-
tions are enabled by inserting the KAP-1 W1 (3P; white/
black/red) into CN3 on the TX-RX unit, inserting W2 (3P;
green) into CN7 on the TX-RX unit, and connecting the KCT-
19 (option) to CN2 and CN3 of the KAP-1.
• Installation procedure
1. Open the upper case of the transceiver.
2. Insert the two cables (
KAP-1 switch unit into the connectors on the transceiver.
3. Secure the switch unit board to the chassis with a screw
( ). The notch (
2
3
front left side.
4. Attach the cushion on the top of the KAP-1 switch unit.
3
3
W1
W2
CN1
CN2
CN3
1
CN3
CN7
20
) /762G/ ( N )
INSTALLATION
R134 R135
Enable ← KCT-18 cannot
Enable
be connected
Enable Disable
Disable Disable ← Power cannot
be turned on
) with connectors from the
1
) in the board must be placed at the
Cushion
(G13-1710-04)
4
2
1
KCT-19
Fig. 5
4-2. 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) Enable
HR2 Disable
Fig. 6 KAP-1 foil side view
• 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
CN2
Q19
Fig. 7
R1 Output form
HR1
HR1
HR2
R153
Disable
Enable
TX-RX UNIT
(A/2)
ANT