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CIRCUIT DESCRIPTION / INSTALLATION
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.
Resistor value
Battery type
1.8MΩ
Li-ion
560kΩ
Ni-Cd
220kΩ
Ni-MH
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 shown 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 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
R633
C607
R607
R626
C631
C614
C632
R640
R617
25
26
R615
R643
R642
32
C606
C646
R641
+
+
R629
R631
R634
CP809
R1
R835
CP810
75
76
R836
TX-RX UNIT (X57-6720-31)
Component side view
TK-2168
R601
C625
C635
17
16
IC601
10
1
9
+
C610
R624
C613
+
R625
VCC
C846
L804
51
50
CP813
CE
CP814
11
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