Trimmers, also known as presets, are small electrical components that can be adjusted. When placed in a device, it is supposed to be correctly set and never seen or altered by the user. Variable resistors (potentiometers), variable capacitors, and trimmable inductors are all examples of trimmers. They are ubiquitous in precision electronics, such as A/V components, and may require adjustment when the equipment is repaired. Trimpots are frequently used to calibrate equipment after it has been manufactured. Trimmers, unlike many other variable controls, are installed directly on circuit boards, rotated with a little screwdriver, and rated for a far smaller number of adjustments over their lifetime. Trimmers, such as trimmable inductors and trimmable capacitors, are commonly found in the intermediate frequency (IF), oscillator, and radio frequency (RF) circuits of superhet radio and television receivers. During the receiver’s alignment procedure, they are adjusted into the proper position.


This hair trimmer was brought in for repair by a retired teacher and a family member. I felt some water pouring out of the gadget as he went into the business and gave it over to me, and when I asked the client about it, he claimed he washed the blades under running water about a week ago and the device has stopped operating since then.


The user instructions for this gadget indicated that it was water resistant and that the blades could be washed under running water, but when I opened the device, I saw the exact opposite of what the specifications stated.


I was able to walk inside the machine and examine what was going on as I removed the screws, and when I did, I saw this mess.


The first sign of rust was the battery connection, and I was expecting the worst.


That is the device’s motor, which is rusted and corroded as you can see, which explains why the gadget was not working.


I was relieved to discover that the main board had not been affected because it was protected by a protective plastic cover.


This is what I saw after removing the entire motor and blades from the housing. I was fortunate enough to have a similar device that had arrived for repair but had not been repaired, so I took the motor off that device and installed it on this one. I apologise for not photographing the procedure.

Anyway, the customer was relieved to find his hair trimmer working again, and I advised him to avoid washing it under running water and to hope for the best.

Jagdamba service, one of our ‘Master Authors,’ has written this article for you and is currently servicing electrical and electronic equipment.