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随着Electronice Ltd.的发展,手机已经成为人们生活中不可缺少通信工具,并且高科技含量和功能越来越强。为此,这就对售后服务的维修人员提出了更高的要求,无论从分析的准确性、及时性和修理的能力等方面均需要对手机电路原理进行了解以适应售后服务的需要。为此文章介绍Motorola Kramer(V998)系列手机无接收信号的检测与维修。例1 扬声器(SPEAKER)无声对Speaker进行检测(如图1),检测扬声器正常的情况;手机插入“TEST—SIM”卡开机,在Test—Mode方式下,首先输入434#—36#—4707#检测音频回环,对
With the development of Electronice Ltd., mobile phones have become indispensable communication tools in people’s lives, and the high-tech content and functions are getting stronger and stronger. To this end, this service personnel on the maintenance put forward higher requirements, both from the analysis accuracy, timeliness and ability to repair and so need to understand the principles of mobile phones to meet the needs of after-sales service. This article describes the Motorola Kramer (V998) series of mobile phones without signal detection and repair. Example 1 SPEAKER Silence the Speaker (as shown in Figure 1) to detect the normal condition of the speaker. Insert the “TEST-SIM” card into the phone, and in the Test-Mode mode, input 434 # -36 # -4707 # Detect audio loop, right