A customer who sells electric Pressure cookers brought me a “return” unit for after-sales service. It had been sent back by a buyer because it was completely dead.
Upon opening the cooker, I
immediately noticed seriously burnt components on the power board. One
Zener diode, which I marked with an arrow for reference, was completely
shorted. I suspect this fault was the starting point that led to the damage.
A customer called me concerning a woofer that she wanted checked by a technician. She told me that the woofer was dead. I was in a hurry, so I did not have time to confirm the customer's complaint, which is very important.
I picked up the woofer on my way to my shop.
upon reaching my shop, I applied the power, and the woofer was up and running. So
I just kept it aside to do other things.
I received a phone call from a client who wanted his treadmill control board checked by a technician.
I scheduled
him the following day since I was busy at the time.
The
following day I visited the company where he works, the treadmill was used as the
worker's gym facility.
On arrival, I
found the board was already taken out of the treadmill and in his
office.
I did some
initial tests and found IGBT (K50DDTP), an Insulated-gate bipolar
transistor dead short.
I tested
other components and all looked good according to my meter, Customer pointed
out that the main circuit breaker tripped when the treadmill was powered.
I received the above inductor cooker in my shop for repair, dead on arrival.
I opened It and did some scanning on the power board, coil, and display circuit and all looked in good shape.
I received a phone call from a client who wanted his television checked by a technician.
I received the above home theater in my shop for repair, complaint from the customer was changing function automatically.
Since I was busy I requested him to leave his contact so that
I can let him know when ready. Later I opened the machine.
I received this machine on my bench,With commercial name of EMSIG made in china.
