A Guitar Amplifier With Volume Knob Broken Replaced. Model: Behringer HA-10G
A friend of mine at church brought me this guitar amplifier for repair. He said that it powers on fine but the volume rotating key somehow was broken and needed a replacement.
It is not a professional brand but the customer was happy with it and wanted it repaired.
If you look to the photo you would see the missing volume rotating key there and I asked the customer what caused the key to be broken like that? The customer smiled but did not say anything. Any way off to the repair.
Here is a closer look of the damaged part and as seen, part of the broken piece is still in there.
To get to the main board these four screws have to come off and the inside board will slide out
Sliding the board, de soldering the broken piece out was done in no time.
It is a B100K as seen in the photo which means when measuring from the two outside pins of the key it should measure 100,000 Ohm.
In this case no measuring is needed because it is broken and I have exactly the same part in the shop.
Sorry I forgot to take a photo of the key before replacing it but here is the final product after it was soldered on board and tested.
The shaft of the replaced volume key is a little bit longer than the others but that did not bother the customer as long it works.
I called the customer and he came for pick up. He took it home, tested it and called me one hour later that everything is fine and he was happy to get this amplifier up and running again.
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 article on A Shorted Welding Machine Repaired. Model: Apex
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Parasuraman S
June 11, 2023 at 9:08 am
So, your fix was guitar play to his ears! (LOL) Good fix and many thanks for sharing!
Waleed Rishmawi
June 12, 2023 at 4:01 pm
Parasuraman: yes LOL. you are most welcome. have a blessed day
Albert van Bemmelen
June 11, 2023 at 4:00 pm
Looking at the printed text 2020-07-04 on that board it must just have been about 3 years old.
In new Practical Electronics July UK magazine many pots are compared on the potentiometer scratching noise they make. One of the best volume control potmeter in that report was the Bourns 91 next to several others mentioned.
And apparently pots must be rotated over their full rotation every 6 months or so, just like a car that relies on lubrication and have to be used to keep fully functioning.
Waleed Rishmawi
June 12, 2023 at 4:02 pm
Albert: thanks for the information. have a blessed day
Yogesh Panchal
June 25, 2023 at 12:42 am
Good Job! Waleed