Crackling sound at quater volume, cuts out when turned up more
Sounds like a blown speaker on low notes but speaker isnt blown. cuts out completely but comes on when u smack the top. removed board, can reproduce problem by wiggleing the main harness to what im guessing is a transistor? ( the black box with all the wires going to it) checked all connections and they seem ok. could it be the black box itself?
Re: crackling sound at quater volume, cuts out when...
Hi Sounds like you have dry solder joints on your pc. Carefully inspect the board and determine how to remove it (Slowly! do not force it out). Turn the board over and with a magnifying glass inspect the solder points if they look Rough or Dry Gently touch them up with a Soldering Iron. If there appears to be a Hole in the solder be careful and apply a bit of solder with a Soldering Iron. Remember to use low heat on your Iron so as to not lift any traces on the pc board and not to leave the Iron on the joint More than Necessary. Good luck, Dereeldeel
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Either the speakers have loosened from the faceplate, or one or more have blown. Open the amp and tighten them down. If that doesn't fix it, remove them a take them to the nearest speaker repair shop for a checkup. If blown either have them re-coned or replace them.
All you need to confirm is to remove the connection to the guitar, remove the jack and cord to the guitar and now check if the noise is prevalent at higher volume, when the volume control is turned up. If so the fault is with the cord , the jack or the gutiar pick up insulation or internal connection or shielding. Cross check with a seperate cord or another amplifier to confirm the case. If the noise is from within the amplifier then it is possible there is fault in the preamplifier, fault with shielding of the inputs or the preamp, broken groung connection. Compliments of the Season.
These speakers have a history of being blown if played too loud. Apparently the higher quality CX version are reliable. If the lows are what is crackling, the voice coils are probably cooked causing it to drag the pole pieces.
I have a Korg C-15s and also experiencing loud crackling sounds when I turn it on. The problems seems to be either the sliding volume control or the amplifier itself. Honestly though, I believe the issue is the volume control. I opened my piano to get a closer look and attempted to clean the contacts on the volume. Unfortunately after cleaning the contacts, the crackling sounds became somewhat worse. After I turn the piano on, the volume control is generally rendered useless......volume set to low volume and the noise is quite loud and other times the volume control is set high and get very low volume crackling noise. No real consistency. The noise does diminish after a few minutes but so does the piano sounds to an inaudible level. There were a couple of instances where I turned it on and surprising enough, no no noise and perfect sound. For these reasons I believe the issue is within the volume control and not so much the amplifier. I have an electronics background and noticed that the volume control is very unique in design and is not something that can be substituted with another volume control from other sources.
My recommendation is to check the sound quality of the audio from the RCA L/R audio outs on rear of the piano by connecting to a stereo receiver. If it sounds fine you're in luck. If the crackling sound does not diminish after a few minutes like mine does, I would suggest disconnecting the internal speakers and using the audio out only. You can connect a pair of studio monitors or high quality computer speakers, preferably with a small subwoofer to deliver the full audio range and deeper tone of a real piano. I'm currently using a basic pair of Logitech computer speakers and is quite acceptable until I can afford a high quality set of monitors or relocate my piano closer to my high quality Yamaha receiver.
Either the control is damaged (happens if they get hit) or it is possible the circuit board it is mounted on has broken solder OR worse, a crack near the control. The unit will require servicing. Parts are readily available.
Here is the schematic:http://www.fender.com/support/amp_schematics/pdfs/Rumble_Bass_Schematic_-B21.pdf Check the tubes to see if one is loose in its socket. Do not attempt to repair this yourself unless you have amplifier repair experience as it is easy to get a bad or life threatening shock without the correct test gear and troubleshooting procedures.I hope this helps.
It sounds like your volume slider is dirty. Try carefully and judiciously spraying a good quality contact cleaner into the slider and working it. do not use a lot. It only takes a little. Also do not use WD40.