Casio Headphone / line out connector broken - need electronic part number of headphone output connector (7 pin), or a schematic or description of switching options to find suitable replacement

Without a schematic you can still trace the circuit to locate the fault.

Put a music source or sound source into the bad channel and a good channel, and with an oscilloscope or with a pair of high impedance headphones with test leads on the ends- you can set up a low z headphone with an impedance match trasformer, make sure you have test prod ends on one of the leads. The other can go to a chassis ground. Start at the input and work your way forward comparing the signal between the good channel and the faulty channel. When you lose the signal or you encounter severe distortion, you are in the vicinity of the defective part.

Common failures are a Deffective 4558 or TL072/TL071/TL074 IC chip. You may have a faulty electrolytic capacitor, or even a faulty bypass caoacitor in general. Bad solder connections, even a broken fim resistor.

With the IC chips, the usual power pins for an 8 pin plastic or ceamic DIP are pins 4 and 8. usual outputs for the 8 pin are 1 and 7 the remaining pins are the inverting and noninverting inputs. 2 and 3 and 5 and 6.

Also check switches and especially those with interupts on the input and output jacks- they can get dirty.

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.

If you have a preamp output jack or a headphones jack on the back- those will work. They should interupt the speaker if you are wanting it for practice purposes.

if you do not have those, and want to add one, tap at the control grid of the Phase inverter ECC83/12AX7A which should be common grid to the final preamp tube, which should also be an ECC83/12AX7A and locate the coupling capacitor so you can tap ahead of it with a .1 microfarad 600 WVDC capacitor or one that matches the factory capacitor in series to the new jack, with shielded audio wire/coax to the new jack location, at the tip and the coaxial jacket should go to chassis ground at both ends. The grid is either pin2 or pin7 depending which way they chose to wire it. I do not have an Orange Amp schematic in front of me.

If you want to risk noise at that location, make it interuptable so when the headphones are removed, the circuit completes to the N/C contact of the headphone jack (which opens/opened when headphone plug is inserted.) back to the grid terminal. with that terminal connected by shielded wire back to the grid.

Instead of adding a capacitor, you can use the factory capacitor, just mount a terminal strip next to the phase inverter and move the capacitor to that new terminal tab and the wire to lead to the tip together on that ear, and the return wire from the headphone jack goes to the now vacated tube pin terminal. .

Look to see if on of the filament/heater pins is grounded to chassis- if so, just ground the sleeve contact of the jack. If it is not, determine which pin is closest to chassis ground potential and run the sleeve contact over to that pin. could be either 4, 5, or 9 Make sure to use an insulating headphone jack.

EL34 outputs should never be connected to a headphone.

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.

The output of the casio may only be mono, you can buy splitters to create a 2x channel output. Is there any other outputs from the casio other than headphones, usually there are red/white RCA outputs (Phono's) which would be better for connecting to your soundcard.

Hope I was of use to you, good luck.

If I were to venture an educated guess I would vote for failing filter caps in the power supply.

The power is likely collapsing under load of the speakers but headphones take much less drive.

If this has an external wall-wart power supply, you might try a new one IF the output is found to be under the rated voltage.

Internal power supply components are beyond those individuals that are not adept at electronics.

If you have a headphone jack, try listening with the phones to see if there is sound. Many of the synths have a way to defeat the line outputs and/or onboard speakers. Sometimes the headphone jack disables the speakers...

Not knowing your configuration regarding external amp/speaker makes it difficult to give further help.

Sometimes there is a mute button and of course the volume control.

Do look at the volume control and see if it MIGHT have been damaged as it likely passes the audio directly. The results of the test with headphones though is important!

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.

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