Kenwood TK-2160 - Manual (Page 11)

TK-2160
11
4) Battery Type Detection
The transceiver automatically detects the battery type,
measuring the resistance between 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.
7. Control System
Keys and channel selector circuit.
The signal from the keys and channel selector are directly
input to the microprocessor, as shown in fig. 13.
Fig. 13 Control system
Channel selector
CPU
IC805
SIDE 2
EN4
EN3
EN2
EN1
67
68
69
70
PTT PTT
SW
SIDE 1
34
74
75
76
AUXSW
AUX SW
SW1
SW2
CIRCUIT DESCRIPTION / INSTALLATION
Resistor value Battery type Input voltage of S-terminal
1.8MΩ Li-ion 0.3~1.3V
560kΩ Ni-Cd 1.3~2.6V
220kΩ Ni-MH 2.6~5.0V
OPEN Battery case 0~0.3V
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 DISASSEMBLY FOR REPAIR section in the Service
Manual.
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 with the optional board.
When installing the optional board, also refer to the chart in
TERMINAL FUNCTION section (page 12) given in the Service
Manual.
Note: To install and use the Scrambler Board, remove “R601”
and “R647” from the front of the TX/RX unit.
R647 R601
R601
R607
R608
R609
R610
R613
R615
R616
R617
R618
R621
R622
R623
R624
R625
R626 R627
R628
R629
R631
R632
R633
R634
R636
R640
R641
R835
R642
R836
C607
R643
C608
C609
R839
R647
R840
C610
C613
C614
C618 C619
C621 C622
C625
R855
R856
C628
C630
C1
C631
C632
C633
C634
C4
C635
C636
C637
C640
C641
C642
C643
C645
C646 C648
C846
C847
R695
IC601
CP803
4
CP808
CP809
CP810
CP812
CP813
CP814
R1
R2
R3
C606
L804
L806
R696
C627
C3
1 9
10
16
17 25
26
32
+
75
76
51
50
CE
VCC
+ +
+
TX-RX UNIT (X57-6720-10)
Component side view