NXR-800H
97
Procedure for Traceability of BGA Package and
How to Replace Control Unit
This clause is procedure when you replace Control unit
on you repair. Implement traceability of BGA package in or-
der to make sure BGA failure in prior to replace Control Unit.
You choose appropriate procedure accordingly.
1. Traceability of BGA Package ICs in Control Unit
The control unit (X53-414) of NXR-800H series have BGA
package ICs. BGA package IC is diffi cult to trace whether it
be broken. So, control unit is diffi cult to confi rm whether
it has a problem. This document shows a simple method
by PC to confirm the control unit has problem. The two
methods for traceability in BGA packages IC are provided as
below.
1-1. Simplifi ed traceability
a) Open the top cover of control unit.
b) Slide the tab on DIP_SW4 (Ref No. S700) to the ON posi-
tion. (See Fig 1.)
c) Connect a cross-wired RS-232C cable to COM port on the
front panel of NXR-800H. Plug the other end of the cable
to PC. (See Fig 2.)
d) Run a communication software, example a Hyper Termi-
nal in Windows, and set the following parameters.
e) COM port: COM port of NXR-800H used in step c.
TROUBLE SHOOTING /
故障排除
BGA 封装的追溯步骤和控制单元的更换方法
本节介绍修理时更换控制单元的步骤。实行 B G A 封装追溯
的目的是在更换控制单元之前确认 B G A 故障。您可以选择相
应的适当方法。
1. 控制单元中 BGA 封装 IC 的追溯方法
NXR-800H 系列的控制单元 (X53-414) 含有 BGA 封装 IC。追
溯 BGA 封装 IC 是否已损坏比较困难，因此，控制单元难以确
认它是否有问题。本文介绍通过 P C 确认控制单元是否存在问
题的简单方法。BGA 封装 IC 的两种追溯方法说明如下。
1-1. 简单追溯
a) 打开控制单元的顶盖。
b) 将 DIP_SW4(Ref No.S700) 的突起滑到 ON 位置。( 参见图 1)
c) 将 RS-232C 交叉电缆连接到 NXR-800H 前面板的 COM 端口。
将交叉电缆的另一端插到 PC 上。( 参见图 2)
d) 运行通信软件，例如 Windows 中的 Hyper Terminal，然后
设置以下参数。
e) COM 端口 : 步骤 c. 中使用的 NXR-800H 的 COM 端口。
Control block
Main MPU: IC703
RF control
MPU: IC34
Modem control
MPU: IC325
TXD,RXD,
R
TS,CTS
CD,RD,SD,DTR,
DSR,R
TS,CTS,RI
COM (DSUB9)
Summary of Contents for NXR-800H
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