At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Static is usually the result of a bad connection. I suspect there is a bad solder joint. If you are electronically inclined, use a listening device or oscilloscope and connect it to the volume control terminals if it is not present on the input to the volume control then it is the volume control that is bad which happens in old equipment best solution is replacing the volume control or you can try cleaning it with an aerosol product for this purpose.
Disassembly the unit.
Your question is less detailed. If the keys is broken,replace with new.
If you mean "How to",then you need the service manual.
Outputs problem,usually causes by output IC (or input IC) is defects.
It also can cause by AD/DA IC is error.
I would start by checking AC cord is good, look for a blown fuse (BE CAREFUL !!!!) or maybe a defective OFF/ON switch. This keyboard is from the mid 1990's so PLEASE consider this before having it expertly repaired. $$$$$$$
If this ties to a keyboard, make sure the keyboard and this are BOTH plugged into the same receptacle. You should send a higher level from the keyboard (turn volume up to around 70% or so) and use less volume at the input gain of this amp. Use more at master volume if the amp has one if needed. If the hiss is there with NO input cables plugged in and input gains at 50%, that is objectionable, the amp probably needs servicing. Unused channel gains should be clear down.
This is just a guess and the purpose is for you to get the datasheet and compare connections and see if they make sense... I have to do this often myself when documentation is unavailable.
Look up the datasheet for LM3886 on google and compare the package, electrical connections, etc. to see if that might be what is used.
MANY audio amps at this power level use this chip for the 50 to 68 watt range. They cost about $4 from the right sources.
If this is not what is used, the amp is probably in the TDA series of 5 and 7 pin TO220 style packages.
Other methods for these amps may involve class D switching amps and those usually use MOSFET transistors, not IC's.
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.
×