OK, first of all try this.
1) Connect the pedal
2) Turn on the PX-5S
3) DO NOT PRESS THE PEDAL WHILE THE KEYBOARD BOOTS.
4) Pedal should function normally
If the above procedure does not give you the desired results, then there's a few other things to check before sending it back for repair.
1) Back up all of your stage settings and try a factory reset.
If this works, then great.
If this does not work then
1) Back up all of your settings, reinstall the latest firmware, then initialize the keyboard with a factory reset.
If none of these procedures works, then you have some sort of hardware problem and need to get an RMA to return the unit for repair.
SOURCE: I have a Casio Privia PX-320. The left side keys
Check that the front of the keys is not hitting the lower plastic case front. If they hit it, then you need to disassemble the case partly and see what has shifted. It is ALSO possible that something has caaaused the aftertouch sensor to move out of position and it is hitting the keys early. ANY of these conditions needs to be addressed before damage is done.
SOURCE: Casio Privia PX-800: When using the sustain
Check if the cble frm the pedal MIGHT be flexing or pulling on the keyboard case when you use it. Such movement COULD vibrate the power connector causing your problem.
Make sure you have the right power supply for the unit as one with too large a hole for the power pin would be intermittent like this.
SOURCE: My sustain pedal stopped working on Privia PX-110
Use an ohmmeter to verify the switch is working to the connector.
Switch failures and broken cords are not that uncommon. Test the EASY stuff first.
Beyond that, check for options regarding pedals in the setup of the unit in your user's manual.
SOURCE: Casio Privia PX-130, 8 months old: fluttering sound
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.
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