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Kenwood Manuals
Transceiver
NEXEDGE NX-220
Service manual
Kenwood NX-220 Service Manual page 45
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:
Instruction manual
(42 pages)
,
Service manual
(110 pages)
,
Instruction manual
(308 pages)
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Contents
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Troubleshooting
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●LCD显示控制 *1
检查点
/LCDCS R667
即使与显示单元互换,LCD也不起作用。*1
可能不是BGA部件损坏。
●LCD上出现错误显示时 *1
LCD显示"ERR 1"。
LCD显示"ERR 2"。
LCD显示"ERR 3"。
●当LED呈红色和橙色交替变化时 *2
警告音鸣响
警告音不响
*1: 仅限C型号
*2: 仅限C2型号
■信号名称说明
1) RST(RESET)
: ASIC 复位信号
2) /BINT
: 电池终止电压监测
3) PSW
: 电源开关信号
4) /FRST
: FLASH 复位信号
5) SBC
: 开关 B 控制
6) /DRST
: DSP 复位信号
更换收发单元
■收发单元信息
型号名称
原始收发单元编号
NX-220
X57-8040-10
故障排除
确认数值异常时
正常电压
3.3V→0V→3.3V
确认数值正常时
LOW →复位
LOW →终止电压
HIGH → ON
LOW →复位
HIGH → ON
LOW →复位
维修收发单元编号
X57-8040-11
如果/LCDCS侧为0V或3.3V,
则ASIC/FLASH/SRAM可能已损坏。
ASIC内部RAM读取或写入时发生错误。
ASIC可能已损坏。
DSP内部RAM读取或写入时发生错误。
DSP可能已损坏。
SRAM内部RAM 读取或写入时发生错误。
SRAM可能已损坏。
未写入频率数据。(未编程)
ASIC内部RAM读取或写入时发生错误。
ASIC可能已损坏。
或
DSP内部RAM读取或写入时发生错误。
DSP可能已损坏。
或
SRAM内部RAM 读取或写入时发生错误。
SRAM可能已损坏。
■"原始收发单元"和"维修收发单元"的确认方法
维修收发单元(X57-8040-11)的
"R4"丝印部分装有0Ω电阻器(R4)。
R4
NX-220
X57-804
元件侧
45
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