A Taxi driver pulled over by my shop and gave me this device. As he explained the problem that it was completely dead. I plugged the main transformer and hooked the plug to the input source of the machine but it was useless.

It is very obvious that this machine was sent to a different technician because I could see the name of the customer on it and also the date.

This is an old machine but it seems like no one was able to fix or too busy to work on such old cheap machine.

The holes were the screws are, once they were taken out, I could see more of this machine

One more screw to come out. The power board lies beneath this old machine.

This is another reason why I think that someone was working on this machine.

You can see the soldering job in attempt of repairing this device.

When I tested the voltages going to the negative and positive terminals, there was no reading whatsoever indicating a problem in the line heading to the battery terminals.

If you look at the photo where the arrow is pointing, that is a S9013 NPN transistor that was found faulty and it has to be replaced.

Once this transistor S9013 was replaced, and the power transformer was plugged to the machine, I could see the machine charging with a flashing green light-see the photo below:

Mission Accomplished.

This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.

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Note: You can check his previous repair articles in the link below:

https://www.electronicsrepairfaq.com/ep2-problem-solved-in-cash-register