Would like replacement preamp board or schematic to repair mine.
SOURCE: Les Paul Studio Electric Guitar: I need a schematic for an Epiphone Les Paul Studio...
Search this site for you config of pickups, pots and swotches.
http://www.guitarelectronics.com/category/wiringresources/
SOURCE: Hi, My Ibanez AEL 20
Remember that while in tuner mode, the audio output is disabled. Try additional presses of the tuner button to see if the audio comes back on. Also verify the volume and EQ gains are turned up. Verify the battery is new.
SOURCE: where to find schematics for M-audio projectmix i/o
Most likely they use 4558 IC's which come in a number of packages and are the most common low noise preamp chip, which can be ordered in bulk from Digikey, http://www.digikey.com
If the IC has a different part number on it- they can enter it into the part search to see if a comparable unit is available.
SOURCE: casio lk-33 does not work with external power
I once had this problem with another Casio synth.
I hadn't the power adapter ant I tried with an other one, with the same specifications : the synth was apparently powered but it didn't work.
I finally understood that it was a problem of polarity (+/-). You may just have to cut the cable and resold it inverted.
Hope it could help!
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