Roland CUBE-60 Keyboard Amp Fix: Crackling and Cutting Out, Solved by Tightening a Jack and Contact Cleaner

This is the English edition of a video from my Japanese YouTube channel, iestaLife. I test gadgets and try small fixes at home in Japan.

Quick take

My old Roland CUBE-60 keyboard amp still powered on, but the volume knob crackled and the inputs cut in and out. After opening it up, the causes appeared to be a loose input jack and dirty contacts. Tightening the jack and applying contact cleaner with a cotton swab brought both inputs back. A little scratchiness remained on the volume pot, and the reverb seemed not to work at the end, but the amp is usable again as a speaker for a wireless microphone.

Roland CUBE-60 keyboard amplifier panel — The CUBE-60 panel

What I tested

Roland CUBE-60 keyboard amplifier (the model number reads CK60)
Symptoms: power OK, crackle when turning the volume, a loose jack on input 1, input 2 cutting in and out
Tools: screwdrivers, contact cleaner, cotton swabs and a cloth
Goal: a grab-and-play speaker for a wireless mic in the corner of the living room

What I found

Inside was cleaner than expected. After removing the rear panel and pulling out the amp unit, there was dust but no obvious damage to the wiring or boards. There is also a spring reverb tank inside, which I removed to work comfortably.

Amp unit removed from the Roland CUBE-60 — The amp unit, out of the cabinet

The reverb switch had popped out of place. It looked as if a knock had pushed it in and unclipped it. Cleaning it and seating it again fixed how the switch moved.

The jacks were loose and dirty. I tightened the loose jack and cleaned the contacts lightly. There was little corrosion.

Do not spray contact cleaner straight in. Spraying directly from the nozzle leaves the inside sticky, which can cause new problems and is hard to clean later. Put a little on a cotton swab, or keep the amount to the minimum.

Applying contact cleaner to a jack with a cotton swab — Contact cleaner applied with a cotton swab

After the fix

Input 1 (the loose one): sound is back
Input 2: works, with a slight scratchy sound that I found acceptable
Volume pot: a little noise remains; more contact cleaner and turning the knob back and forth should help
Reverb: it seemed not to work by the end, maybe a broken switch. I do not use it, so I left it

Who it’s for

Anyone with an old amp that crackles or cuts out, before throwing it away
Anyone who wants a casual home speaker for a mic or an acoustic guitar
Not for people who need loud volume or very clean sound from this size of amp

Watch the video

【古いスピーカーはポップでおしゃれ？！】簡単修理で古いキーボードアンプをワイヤレスマイク専用スピーカーに

The video is in Japanese, but the work is easy to follow. Useful moments: 2:10 for opening the amp, 5:40 for the contact cleaner, and 6:50 to hear the result.

Limitations

This was a light fix, cleaning and tightening, not a component-level repair. I am not an electronics expert, and results depend on what is actually wrong with your amp. Unplug the amp before opening it. The sound is not especially loud or clean for its size, but it is fun for playing at home.