Emergency Mode - Kenwood TK-760G Service Manual

4-3. 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.
TX-RX UNIT
8C
IC9
Shift
Q5
register
4
Q1
Q6
13
Q6
IGN
Audio
power amp
IC13
+

5. Emergency Mode

5-1. Transceiver Modification Procedure
• Install the foot switch
Install the foot switch through the KCT-19 and KCT-18.
When the switch is treaded on, the radio enters the emer-
gency mode.
• Change the power switch circuit
TX-RX unit (B/2) : Control section
$R705 : Attach (R92-1252-05, 0Ω)
TX-RX unit (A/2) : RF section
R142 : Remove (RK73GB1J473J, 47kΩ)
Once the transceiver is modified, it cannot be turned on
and off with the power switch. The power switch turns the
LCD backlight and display on and off. (The power is
switched on and off by IGNITION SENSE.)
INSTALLATION
KAP-1 (SWITCH UNIT : X41-3380-20)
Q1
D1,2 : 1SS193
Q1
CN3 W1
HOR 1
E 2
D2
SB 3
CN7
W2
PA/LI 1
SPO 2
SPI 3
CN8
Internal/External
speaker
TK-760G/
: DTD114EK
K2
±
+
D1
C3 0.01
K1
R3 0
R4 0
±
+
Q1
D2
C4 0.01
Fig. 8
Q505
SB
MBL
Q506
MBL
TX-RX section
KCT-19 Terminal
13 1
15 6 3
3 : Ignition sense
6 : Earth
15 : Foot switch
( N ) /762G/
C
CN1
1 GRN
HR2
2
NC
CN2
1 BRN
HR1
2 ORG
E
3 YEL
SB
B
C
CN3
1 GRN
PAO/LIO
2
E
KCT-19 Terminal
13 10
15 12
6 : Earth
10 : HR1
12 : PA (HR2)
Control section
LCD
Key
backlight
IC502
IC510
Attach
CPU
$R705
6 87
0
88
25 20
CN5
1
3
Remove
KCT-19
IC14
15 pin
Outside
KCT-18
Foot
switch
Fig. 9
( N )
KCT-19
1
6 3
Power
switch
21