Getting hum through the speaker but when i put my hand on the jack socket it stops

It's a Chinese made Roland and no service information is available as when a fault is found the main board is replaced, eliminating the need for service information.
I would check that it is a stereo out jack and not mono. If it is a stereo out, check that both input phonos work. If they do, replace the faulty socket or damaged pcboard.

Some hopefully easy fixes : Input jack could be the problem, or connection from the amp to the speaker. Does the speaker hum a bit with the volume up almost all of the way without anything plugged into the unit? If not, check the connection from speaker to amp.

If it does hum slightly when u crank the volume, check your input jack -- it might be jacked up (pardon the pun) and you can fix that easily by soldering in a new one.

try plugging into a different socket if that doesnt solve problem you may need to replace cord. sounds like a loose neutral in socket though.

Make you a hook out of a coat hanger. Get inside and hook the wiring to the jack, take the nut off the jack and pull it up through the F hole. You can plug in to it a patch cord so you can pull it back through once fixed. Check out Guitarelectronics.com for a wiring diagram.

The headphones socket is on the preamp stage - it works so the problem must be after the pre-amp.
Do you get any sound at all from the speakers (hiss or perhaps a click) when you turn it on?
If yes it is an amplifier problem.
Here are some possible causes

• A wire has come off the loudspeaker - easy to fix
• Speaker protection fuse has blown - small glass fuse mounted on main amplifier chassis - replace with correct rated and type of fuse (note some of these are 'slow' blow type - important that you get the right one)
• faulty component in the main amplifier stage - requires attention from qualified repairer
• Loudspeaker burnt out - this can be tested by connecting another speaker across the terminals of the built in speaker.
• The headphone jack socket automatically disconnects the loudspeaker when phones are plugged in - it could be that the contact in the headphone jack socket is bent and not re-making contact when the headphones are unplugged.

i) Disconnect one lead of loudspeaker & insert an open-ended guitar cable into headphone socket.

ii) Put a dc voltmeter across open end jack then turn Frontman ON for a few seconds.

iii) The reading should be about 0volts - if the voltage is high (27v), then it is likely that the PA chip TDA1514A has blown.

iv) If,however, the voltage is correct in iii) , then reconnect speaker & put guitar cable into the POWER AMP IN socket & connect other end to guitar...Turn on briefly, if there is still hum then fault is in the output stages & will require chassis removal to solve.

Likely one half of the full-wave rectifier has failed. Take in for repair. Sometimes output amp shorts to one power rail causing this. DO NOT continue to operate this until repaired as it will destroy the speaker!!!

First, we need to get the terminology correct.

The DJM has "PHONO" (RCA) jacks, not "phone jacks" of which the current usage is normally the 1/4 inch diameter.

You would be going INTO the Berhinger 1/4 inch jacks on the back of the speakers since you are not using the three pin XLR connections that are used for balanced lines which the DJM does NOT have.

So you should have RCA plugs to 1/4 inch plug cables. The inputs on the 1/4 inch will take TRS connections. IT IS possible you may need to use an RCA to TRS cable with the signal on the "ring" rather than the "tip" of the connector.

A test of the speakers is to touch the tip of the RCA plug with the speaker on and you should hear a hum.

PLEASE be aware that these speakers are INTENDED for use as studio monitors by the sound man in the booth and NOT for playing loud at a venue for dancers, etc.

output caps. dont beat up your amp. crazy
yostamplifier.com