Turn off the p155 power. Press & hold down the rightmost key (C7) while turning on the power. Once the power is On release the C7 key. It should reinitialize to the original factory setting
Just did it on my DGX-650 keyboard and it reset to normal. Kept the bank settings as well!Just did it on my DGX-650 keyboard and it reset to normal. Kept the bank settings as well!
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To start with always best to use the correct power supply these should be readily available from any good Yamaha store. Is the sustain pedal a Yamaha pedal? The plug end of the pedal connect a multimeter across the two connectors and set meter to show continuity. If there is no continuity press pedal, hopefully this will now respond. If not then the break is in the pedal. If meter idea works then it could be the socket on the keyboard, these can work loose on the pcb they are mounted to if they are used a lot.
You could open up the keyboard and look inside checking the solder joints on the socket or simply take to a Yamaha service centre.
You could also try a master reset of the keyboard, hold down the highest note whilst turning on, this will reset to factory default.
You can normally reset Yamaha keyboards by holding down the highest note while turning on. If you want to do a full factory reset see below - remember this may delete all songs etc you have saved to the keyboard memory.
Turn off P155 hold top C key down (furthest white key on your right) while holding this key down, turn on power, keep holding key down for 3 seconds, then let go. should default to grand piano 1 setting
Try local Yamaha dealer. They may not make house calls, few people these days do.
What you might try if you are up to the challenge is flip the keyboard over- unplug it. remove the screws that hold the top and bottom shells together- do not let weight of unit rest on keys, especially when opening it up.
Look for physical damage to the keyboard action in the vicinity of the nonfunctional section. Check for broken printed circuit board. If you see any cracks, see where it ends and drill a small hole at the end of the crack to halt propagation. clean the varnish off the circuit tracks and tin the broken tracks first on either side of the break then bridge them with solder. Use a modest sized soldering iron and small diameter (rosin core only) solder. If there are any broken wire connections, resolder them. This may require part of the action to be removed from case- take pictures first before proceeding- make sure they show exactly where the connectors are and what wires are present. etc. You want to be able to refer to the pictures in the event you forget details of disassembly.
If nothing looks out of place, look for solder joints that do not appear to have flown out nicely- reflow them adding a little solder.
Read about initialization on page 61 of your user manual. This is a factory reset. There are two procedures there. If you don't have the manual download it here:
A lot of Yamaha have similar circuits between different models.
When you go to these links, scroll down the page looking for a small link "Get Manual". They will only let you download two a day without registering.
The first of these has the power entry on page 154... the second is on page 60. Both use the 16 volt power adapter. See if one of these schematics is not close enough to your unit to troubleshoot it.
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