Fluke dtx-sfm2 single mode module of a company in Hangzhou - repair case

I recently received a technical consultation from a user in Hangzhou ,** The set on hand DTX-SFM2 Single mode fiber modules have always been in normal use , Suddenly, it can't be used for a moment . I don't know why ？**
At the suggestion of our technicians , Use the mode of single module loopback test . use To determine which module has failed , Then deal with it pertinently . This is the simplest elimination method we use everyday . Confirm whether it is the module of the main terminal or the auxiliary terminal , According to its feedback, one of the modules is always in an open circuit state . Found on connecting to the host out That is, the red light at the transmitting end flashes normally , We preliminarily judged that it may be the module in Input end , That is, there is a problem with the receiving end of the power meter . So she was advised to check carefully , Whether there is looseness , Or the interface bayonet pollutes dust and so on .

Next, the user's feedback confirms that there should be something wrong with the receiving end of the power meter , The problem is not dust pollution , But because of the user's inattention , Lead to The mirror glass at the input end of the power meter is broken 了 , It's just a strange case , The mirror inside is shown in the figure below ：

 
Confirm that it is a hardware failure , There is no way but to let users express to our maintenance laboratory . After receiving the faulty module , We switched to a professional maintenance process . First, dismantle the machine to confirm whether other functional parts can work normally ？  The key point is to carefully check and identify the fault part , Confirm the fault type , Is it possible to repair and restore ？

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After careful examination and screening , Confirm that the device is basically impossible to repair , The only thing we can do is to replace the faulty components . Very lucky , We happen to have a spare prototype module idle in the warehouse , We can only top it first , Requisition the power meter device of this module , Weld back the original way .

 

When replacing the power meter, pay attention to the following Three probes , The order cannot be wrong , There shall be no faulty soldering or short circuit , Basically, there is no difficulty in operation . After replacing this power meter device , On board test , Everything is all right .

thus , The fault is removed , There is no way to solve the hardware damage through chip repair , So for sensitive optical devices , Pay special attention to , Be sure to avoid using brute force , Otherwise, damage to optical devices will not pay off , Too much loss .

The road to repair , It seems extremely simple , That's because there is a set of optical modules of the same specification ,  If there are no accessories , Is also out of reach , Because the official production has been stopped , There are no accessories of the same specification in the market . so , Use it and cherish it .