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Assuming this is a PSR-S700 then you need to undo all the screws under the keyboard and open up so you can see inside under the speaker grill. You will see the grill has tabs that poke through the casing and these are then twisted to keep it in place. Straighten these, push tab through casing going from side to side and then the grill will eventually work free. You do not want to do this too much as the tabs will eventually break with wear.
The tray has become misalligned. If you want to fix it on your own heres what you do. Remove the 6 (or 8 depending on generation) screws on the bottom. Remove the warranty sticker on the back by the power switch. With the front towards you, lift the top while tilting slightly toward the front and pivoting it by the power/eject buttons. Either remove the button assembly by popping it off the lid or just be careful not to tear the cable. Remove 4 philips screws from the cd mech lid and lift off. Remove two philips screws from the tray hinge. Lift and slide tray out of front. Push white gear frame at front of tray area to the right and hold it there while you put the tray back in. Reassembly is reverse of disassembly.
HQRP AC Adapter / Power Supply for Yamaha PSR-280 / PSR280 / PSR-290 / PSR290 Keyboards Replacement plus HQRP Coaster, 600 related issues. ... is there an internal battery to protect memory and if so, do i need to replace it? yes there ...HQRP AC Adapter / Power Supply for Yamaha DGX-620 / DGX620 / DGX- ...
HQRP AC Adapter / Power Supply for Yamaha PSR ... - Fixya
HQRP AC Adapter / Power Supply for Yamaha PSR-280 / PSR280 / PSR-290 / PSR290 Keyboards Replacement plus HQRP Coaster, adapter related ... need a new one, you could try to get a replacement from casio or try to get an ... It MAY appear to operate on DC BUT it can't generate the +/- voltages internally for sound .
HQRP AC Adapter / Power Supply compatible with Fulltone CATALYST / CHORALFLANGE Guitar Effects pedals Replacement plus HQRP Coaster by HQRP. $7.91. ... The MS-90 is a column monitor stand that features three internal channels - .... Yamaha SK88 Survival Kit for 88-Key YPG Series Keyboards by Yamaha.
Your key contacts have gotten dirty. Two contacts per key are used to sense velocity and if one doesn't work the sound will be full velocity and loud.
The contacts are conductive rubber "pills" in silicone rubber domes that the key presses down onto circuit board traces under the keys. Clean both the "pills" and the black portion of the circuit board GENTLY using ONLY 99% isoprophyl alcohol and QTips. There is a lot of disassembly required and one has to keep track of where the screws go and length and thread type to re-assemble after cleaning. Also great care must be taken to not damage the ribbon cablles connecting the top and bottom halves of the case.
Not familiiar with the PSR 6700, HOWEVER on the Yamaha Tyros the keys stay with the baseplate part. Once the top cover is removed, there are screws holding the segments of keys. The keys on the Tyros are in segments. As I recall the black keys are in two individual sections.
There may be commonality between the synths.
The keys press on a sheet of silicon rubber domes that have conductive "pills" under them. The restoring force is actually from the dome itself. Two contacts per key! BE CAREFUL to align the silicon sheet when re-assembling.
I don't have a parts source for these other than Yamaha. Call them up to get the part number for the board. The sound is usually sent through the headphone jack which acts as a switch when you use headphones. Replacing that board should resolve your problem. If the board is no longer available, it is possible to repair the existing one, but this is a specialty task and not one I would recommend a novice attempt.
You have to completely remove the circuit boards. If this is the keyboard I'm thinking of then the keys are all mounted on the same part like parts on the sprue in a model airplane kit. If its a different one then you have to remove the assembly and take the spring of the key you want and at the other end when you flip it over there is a strip glued on the metal frame to secure the keys that you have to peel off for that sector.
Most upright vacuums will have 2 screws on the bottom of the vacuum. Remove both screws and snap off bottom cover to get inside of the head. Remove old / broken belt and slide agitator off from the head unit. Stretch new belt with both hands then place around the agitator and pulley coming out of the motor. Place the agitator back into place (there will be some resistance from the new belt, but that is common). Put back on the bottom cover and place back the screws. You should be all set then. Hopefully this helps.