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use a mini adapter to a large one.(3.5 to 1/4) or mini headphone jack to 1/4 headphone jack.plug a male3.5 into your outgoing headphone jack or from the pc convert the other end of that cord to get you to the proper size or 1/4 head phone jack.the primary cord from the pc needs to be a male to female cord.they make adapters that will get you the rest of the way.3.5 mini male to 1/4 phono female.then you plug your amp in to the 1/4 female.wala
Some keyboards use the amp output sockets for headphone use. You might need some adapters for your headphones. If it fell in, you would see an empty hole. This would be unlikely because it is held on by two screws. If all fails, buy an amp with a headphone jack input. Plug the keyboard into the amp and use the amps jack.
plug headphone in the effects send jack...If you get somme sound (won't be too loud) there, that means preamp sections are probably ok. Drive a signal into the effects return jack... If power amp responds, it is OK... If both these are OK, then suspect the switch contacts on these two jacks that forward the preamp to the power amp when effects unit is NOT plugged in.
These contacts are a chronic problem.
Contrary to what's posted above, the Marshall MG series does not pass the speaker power output through the headphone jack, and inserting the headphones into the jack does not disable the speaker. The headphone amp is a separate circuit and it's input is taken before the master volume. So Jan's post is exactly right. Turn off the master volume and turn up all the other gain/volumes as high as they will go. The other issue is that the headphone jack's output does not drive low efficiency headphones well, so you need some headphones similar to Sony's MDR-V700s to hear it well. Earbuds just don't cut it.