Kenwood TK-3207G Service Manual page 19

TK-3207G
2) Memory Circuit
Memory circuit consists of the CPU (IC405) and an EEPROM
(IC406). An EEPROM has a capacity of 64k bits that contains
the transceiver control program for the CPU and data such
as transceiver channels and operating features.
3) Low Battery Warning
The battery voltage is checked using by the microprocessor.
The transceiver generates a warning tone when the battery
voltage falls below the warning voltage (2) shown in the
table.
(1) The red LED blinks when the battery voltage falls below
the voltage (1) shown in the table during transmission.
Note:
During reception, transceiver constantly checks the battery
level. When the battery level drops near to 5.9V, the red
LED blinks and low battery warning tone is generated.
(2) The transceiver immediately stops transmission when
the battery voltage falls below the voltage (2) shown in
the table. The warning tone sounds while the PTT switch
is pressed.
Ni-Cd Battery
(1) 6.2[V]
(2) 5.9[V]
18
CIRCUIT DESCRIPTION /
IC405
CPU
Fig. 9 Memory circuit / 图 9 存储器电路
Ni-MH Battery
6.2[V]
5.9[V]
R404
SB
Fig. 10 Low battery warning / 图 10 电池低压警告
电路说明
2) 存储器电路
存储器电路由 CPU (IC405) 和 EEPROM (IC406) 组成。
有 64k bits 的容量，包含 CPU 用的对讲机控制程序以及信道
和操作功能这样的数据。
IC406
EEPROM
3) 电池低压警告
通过微处理器监视电池电压。当低于表中所示警告电压(2)时
将发出警告音。
(1) 发射中，当电池电压低于电压 (1) 时红色 LED 闪烁。
注意∶
对讲机在接收时不断地检测电池电压。当电池电压降到接近
5.9V 时，红色 LED 会闪烁并产生低电池电压警告音。
(2) 当电池电压降到电压 (2) 以下，对讲机将立刻停止发射。
按下 PTT 开关时响起警告音。
Ni-Cd 电池
（1） 6.2 [V]
（2） 5.9 [V]
IC405
88
BATT
CPU
Ni-MH 电池
6.2 [V]
5.9 [V]