Emergency Mode - Kenwood TK-868G Service Manual

TK-868G

Emergency Mode

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.)
Q505
SB
Key
backlight
MBL
Q506
MBL
TX-RX section
KCT-19 Terminal
13 1
15 6 3
3 : Ignition sense
6 : Earth
15 : Foot switch
6
INSTALLATION /
Control section
LCD
IC502
IC510
Attach
CPU
$R705
6 87
0
88
25
CN5
1 3
Remove
KCT-19
IC14
15 pin
KCT-18
Foot
switch
Fig. 7 /
TX-RX unit B/2
Foil side
Power
switch
20
Outside
R705
F.RESET
TX-RX unit A/2
Foil side
R142
Fig. 8 /