Installation - Kenwood TK-2160 Service Manual

CIRCUIT DESCRIPTION / INSTALLATION
4) Battery Type Detection
The transceiver automatically detects the battery type,
measuring the resistance betw een the S-terminal and +
terminal on the battery pack and changes the supplied
voltage to the S-tarminal as below . The microprocessor then
detects the battery type.
Resistor value Battery type
1.8M Ω Li-ion
560k Ω
Ni-Cd
220k Ω Ni-M H
OPEN Battery case
7. Control System
Keys and channel selector circuit.
The signal from the keys and channel selector are directly
input to the microprocessor, as show n in fig. 13.
Channel selector
70
EN1
69
EN2
68
EN3
67
EN4
Fig. 13 Control system
Input voltage of S-terminal
0.3~1.3V
1.3~2.6V
2.6~5.0V
0~0.3V
34
PTT
PTT
SW
74
AUXSW
AUX SW
IC805
CPU
75
SIDE 1
SW1
76
SIDE 2
SW2

INSTALLATION

1. Optional Board
Remove the TX/RX unit from the radio before installing the
optional board in the radio.
The procedure for removing the TX/RX unit is described in
the DISASSEM BLY FOR REPAIR section in the Service
M anual.
Install the optional board on the back of the TX/RX unit.
For details on installation of the optional board, refer to
Installation Information supplied w ith the optional board.
When installing the optional board, also refer to the chart in
TERM INAL FUNCTION section (page 12) given in the Service
M anual.
Note: To install and use the Scrambler Board, remove " R601"
and " R647" from the front of the TX/RX unit.
R647
R633
C607 R607
R626
C631
C614
C632
R640
R617
25
26
R615
R643
R642
32
C606
C646 1
R641
+ +
R629
R631
R634
CP809
R1
R835
CP810
75
76
R836
TX-RX UNIT (X57-6720-10)
Component side view
TK-2160
R601
C625
C635
17
16
IC601
10
9
+
C610
R624 C613
+
R625
VCC
C846 L804
51
50
CP813
CE
CP814
11