How to change tact switch of roland xp - Roland Office Equipment & Supplies

I suggest you contact /Roland directly. Here is the link-

Roland Company Contact Us Contact Us

If you buy a second hand, it may have been damaged in mini switch (tact switch) under the WRITE button. You need to replace the tact switch. Easy and inexpensive, you can do yourself, only with a little knowledge of soldering
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Tact Switch:
You may also try the FACTORY RESET.
Restoring the GT-10 to the settings made at the factory is referred to as a "Factory Reset."
Not only can you return all of the settings to the values in effect when the GT-10 was shipped from the factory, you can also specify the range of settings to be reset.

If you do this"Factory Reset", all the setting on user memory (that you create) will be erased, so backup your setting before doing this steps.

For more detail on "Factory Reset", read the GT10 user manual:
roland.com/support/article/?q=manuals&p=GT-10&id=1810803

How can you state power supply is working excellent, please?

hi there.
see if this link helps you out.
Roland xp 50 main board sound problem Google Search

ftp://ftp.roland.co.uk/productsupport/

I would start by checking AC cord is good, look for a blown fuse (BE CAREFUL !!!!) or maybe a defective OFF/ON switch. This keyboard is from the mid 1990's so PLEASE consider this before having it expertly repaired. $$$$$$$

I assume you are using ROLAND pedals... they are BACKWARDS to most other pedals you can buy regarding the on-off sense. If yours are NOT Roland pedals, you MIGHT be able to open them and rewire... not all can be rewired, but some can be rewired to reverse the switch direction.

OFTEN Roland has the opposite sense of normally closed contacts versus normally open. Test the switch with any continuity tester or an ohmmeter to see that the contacts work and come out to the switch. ALSO some amps require a TRS type connection (three wire plug) and others do not. From the schematic it appears that the Laney may REQUIRE a normally closed contact. There is also a pull switch involved that you MAY have to change the state of for operation of the pedal.

Here is the scheamtic for your amp:

http://elektrotanya.com/laney_aor100h_sch.jpg/download.html

Scroll down to the link at the page "Get Manual" and click to download. It is a JPG type file.

If it is an intermittent problem, changing the tact switches on the main board solves a lot of these problems. Tact switches are on front of main chassis where customer controls activate them.

ok! change all tact switches! your tact switch has abnormal resistance! thats why your tv is changing system!

ok cowsad! you have defective tact switch relace all tact switches! the tact switch is have only resistance if you press it, but now ithink your switches is now have smal resistance thats why your tv is on and off automatically.