Kenwood TK-3178, Руководство по обслуживанию

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TK-3178
(
L
)
18
Low battery warning Battery status
The red LED blinks during the
transmission. The battery voltage is low but
the transceiver is still usable.
The red LED blinks and the
warning tone beeps while the
PTT switch is pressed. The battery voltage is low and
the transceiver is not usable to
make calls.
低 电 池 电 量 警 告 电 池 状 态
发射期间红色 LED 闪烁。
电池电压低，但手持对讲机仍
能使用。
按下 PTT 开关时，红色 LED 闪
烁并响起警告音。 电池电压低，不能使用手持对
讲机进行呼叫。
SB
R27
R28
IC7
MCU
138
BATTLVL
Fig. 10 Low battery warning /
图 10 低电池电量警告
5-4. 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 volt-
age to the S-terminal as below. The microprocessor then
detects the battery type.
Resistor value Battery type Input voltage of S-terminal
1.8M Ω Li-ion 0.3~1.3V
560k
Ω
Ni-Cd 1.3~2.6V
220k Ω Ni-MH 2.6~5.0V
OPEN Battery case 0~0.3V
5-5. Key Input
Keys and channel selector circuit.
The signal from the keys and channel selector are directly
input to the microprocessor, as shown in Figure 11.
5-4. 电池类型检测
手持对讲机自动地检测电池类型，测量电池组在 S 终端和
＋终端之间的电压的变化。然后微处理器检测电池类型。
阻 抗 电池类型 S 终端的输入电压
1.8MW Li-ion 0.3
~
1.3V
560kW Ni-Cd 1.3
~
2.6V
220kW Ni-MH 2.6
~
5.0V
开放 电池盒 0
~
0.3V
5-5. 键输入
键和信道选择电路。
如图 11 所示，键和信道选择器的信号被直接输入微处理器。
* 0 # C
8 9 B
5 6 A
2
7
4
1 3
S
107
KEY1O KEY2O KEY3O KEY4O KEY1I KEY2I KEY3I KEY4I
108 109 114 103 104 105 106
EN2 EN3
102
89
Selector
IC7
MCU
127 126 128 125
SIDE2 SIDE1
AUX
PTT
SW2
SW1
AUX
SW
PTT
SW
Fig. 11 Key input /
图 11 键输入
CIRCUIT DESCRIPTION /
电路说明