Kenwood NXR-700H Service Manual page 21

3-6. High temperature detector circuit
The high temperature detector circuit consists of a ther-
mal switch IC (IC7) and a switching FET (Q2).
This circuit lowers the transmitter power when the fi nal
unit temperature is too high (83°C or higher).
Fig. 12 High temperature detector circuit / 图 12 高温检测器电路
3-7. FAN action control circuit
The FAN action control circuit consists of a FAN and a
AVR (IC12).
Fig. 13 FAN action control circuit / 图 13 FAN 动作控制电路
3-8. Current detector circuit
The current detector circuit monitors the current of the
Power Amplifi er Module. It consists of a current detection
resistance (R4) and a current detection IC (IC1). It detects
the normal and abnormal state of the Power Amplifi er Mod-
ule by monitoring the current of the Power Amplifi er Mod-
ule. If a failure occurs, it stops operation.
CIRCUIT DESCRIPTION /
Power module
VGG
Pin
Q2
SW
VBATT
IC12
AVR
M
Current
sense IC
Fig. 14 Current detector circuit / 图 14 电流检测器电路
电路说明
3-6. 高温检测器电路
高温检测器电路由热控开关 IC(IC7) 和切换 FET(Q2) 组成。
末级单元的温度过高时 (83℃或更高 )，该电路便会降低发
射机功率。
IC10
VDD
Pout
IC7
Temp
protection
IC
3-7. FAN 动作控制电路
FAN 动作控制电路由 FAN 和 AVR(IC12) 组成。
FAN_CONT
3-8. 电流检测器电路
电流检测器电路监测功率放大器模块的电流。它由电流检
测电阻 (R4) 和电流检测 IC(IC1) 组成。它通过检测功率放大
器模块的电流来检测功率放大器模块的正常和异常状态。如
果发生故障，它将停止操作。
IC1
PA_CURR
NXR-700H
21