I can not get any sounds out of the headphone jack or the output jacks on the module

First - Check the connections on the speaker itself - when speakers don't work. it's usually the wires from the power amp section to the speaker. If those are OK, try replacing or bypassing the headphone jack - you may have a short in the output jack. Good Luck

Check to make sure the problem is not with the headphone jack or the external speaker jack as these are in the circuit between the power amp chip and the built in speaker.

You can also trace through the circuit with a music source on the amp input and with simple headphones check the signal path through the circuit until the music disappears. To do this, take a headphone and set it up with 2 test leads on the ends- attach one to ground.

Now your TL072 op amps have 2 outputs, pin1 and pin 7. The inputs for pin 1 are pins 2 and 3, and the inputs for the amp section outputing on pin 7 are pin 5 and pin 6. If you get sound at pin 1 or pin 7, you move forward to the next TL072. Check for output. Then move to the power amp chip on the heat sink. Pin 1 should be the output and will be wired to the headphone jack first. The external speaker jack second and the built in speaker third. The input for that power amplifier chip is pin 7 or pin 8 depending how it is wired.

If the amp chip is blown, make sure to put an adequate amount of thermal grease on the back side of the IC in contact with the heat sink so it can operate as cool as possible.

A common problem is that the switch contacts on the headphone jack that send the audio to the speaker when headphones are unplugged go bad. Some of these are so low quality that after a few times of inserting a plug the contacts no longer make. If you can access the jack, you might find a jack similar to: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=RA49B12B-ND
What happens is the spring tension on the tabs over the top of this that contact the leads to the speaker lose tension and no longer press hard enough on the contacts to make contact. Try to open your unit and see if it has this kind of jack... Frankly, these jacks are JUNK and a chronic problem.

Check if headphone jack also has right channel dead... If headphones work on both channels, switch contacts on headphone jack MIGHT be the problem.

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.

The "Breath" jack is for a "Breath controller" NOT headphones!!!

The breath controller was a pressure sensitve device you blow into that generates a signal to modulate the sound.

Put the headphones in the jack "PHONES"
I know, I have an SY77.

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.

Read around page 33 of your user manual about routing of sounds to the busses. The headphone jack is kind of an automatic thing compared to sending sounds to the aux and mains which require some setup.

The owners manual is here:http://lib.roland.co.jp/support/en/manuals/res/1811143/TD-10_eG.pdf Try initializing the TD-10. Check page 137. Check page 132 and 133. If the problem is still there, you likely have a jack problem. There might be a bad solder joint where the jack is mounted to the circuit board. If the warranty is up you can do it yourself if you are confident. Otherwise take the module in to have it serviced. Check here to contact Roland:http://www.roland.com/index.html

Ensoniq zr-76 no output signal on the main and aux, but i have output on headphone jack?