Keys don't work in random pattern formation

Single and Finger,is chords mode.
In Single,by press one key (eg:A) then chords A is heard,and so on.
In Finger,you must press 3 keys.Example: G-B-D,then you heard G chord. D-F#-A is D chord.
In Finger,lets say you press A chord and want to change to C chord by press one key C only,there's nothing change untill you press C-E-G.
Low, is for chords octave low.
Chords Off,no chords can be play,it mean overall full piano mode..
Single,Finger,Low, can be activate with Sync Start button.

If those keys work normally, it's hard to see how the key switches themselves can be bad.
Is your keyboard MIDI capable? If you play the same chords, does the MIDI output look OK?
Could it be that your keyboard simply can't play all of the different sounds at the same time? I know some are limited in how many simultaneous tones can be played.

It depends exactly on the model of keyboard you have but in short look for the accompaniment button normally on the left hand side. With this pressed you can then get 1 finger chords in the left hand ( 2 fingers will give minor or 7th options ) check your handbook

check the track connecting the keys .their should be cracks or dry solder.I think that should solve your problem.

A SIMPLE way of looking at the transposer is that it shifts EVERY key on the keyboard left (+) or right (-) by the number of the transpose. ALL keys, black and white are counted. As far as counting sharps and flats I would NOT depend on that. The transpose would for instance allow you to play a song you knew in "C" and have the sounds moved to a different key. For instance, a transpose of +2 would move EVERY C to "sounding" D, C# to D#, D# to F, E to F#, F to G, F# to G#, G to A, G# to A#, A to B, A# to C, and finally B would sound C# pitch. Given a key like G for a song that has one sharp (F#) to play this by keying it in the key of "C" you would use a transpose of +6 or minus 6. The number of key positions (including black) between the key you want to play in and the key the song is in. For a song in D that is played in C you would use either a +2 transpose or a -10 depending on whether you wanted the higher or lower octave to sound. Looking at it this way I do NOT believe the method you proposed would work... Look at it the way I described and you won't go wrong.

If you are running on batteries, they are either depleted OR may have corrosion on the contacts in the keyboard which is COMMON problem. If using an adapter, the cords chronically work loose. A last problem is the switching for using battery or adapter can have poor contacts. If you don't have an adapter, get one and get one SPECIFICALLY for the keyboard... I don't know how many I have had to tell they have the wrong adapter and that is why their unit won't work.

First make sure a keyboard "split" option is not set.

Probably you are going to have to clean the key contacts. They are likely conductive rubber "pills" that are pressed onto a circuit board that has interleaved fingers. Clean both the black pills and the circuit board using ONLY 99% isoprophyl alcohol and Q-Tips.

If you can find the C-below-middle-C ?

Put your small finger on C,
your next finger on the next white key: D,
your middle finger on the next white key: E
your index finger on the next white key: F
your thumb on the next white key: G

Lift your fingers away from D and F -- to keep this simple -- all we did was identify the D and E and F and G keys, relative to the C key.

Press C and E and G (small, middle, thumb)
to play a "major" chord in C.

Move your fingers "up":
C to D, E to F-sharp, G to A,
and play a "major" chord in D.

Move your fingers "up":
D to D-sharp, F-sharp to G, and A to A-sharp,
and play the chord in D-sharp (usually called 'E-flat').

Move your fingers "up":
D-sharp to F, G to A, and A-sharp to C,
and play the chord in F.

Move your fingers "up",
F to G, A to B, and C to D,
and play the chord in G.

Go back to the starting position (C-E-G),
and move "down": C to B-flat, E to D, and G to F,
and play the chord in B-flat.

So far, you have C-major, D-major, E-flat-major, F-major, G-major, and B-flat-major.

There are more chords, but most pop-music is in one of these keys.

Give it a try.

A lot of left-hand stuff is just the small-finger and thumb, omitting the middle finger, e.g., C&G,
to avoid a too "muddy" sound.

Or, "stretch" your hand: C-and-G-and-the-next-higher-C.

In Casio Chord mode, the bottom keys up to the second F plays Bass Chords. The Keyboard is just putting the keys you play back into bass when you get up that high. If you read along the plastic edge above where they keys come out of the keyboard, it shows you where the Chord keys end and the Keyboard begins. If you want use of all the Octaves, slide the power switch to the first setting (normal).

I just fixed this exact problem today. It took me a while to figure out how to get to the key bed, but it's not impossible. I'll try to retrace my steps and describe them as well as I can:

- Turn the keyboard upside down on a table with the joystick hanging off the table. To make my directions easier to follow, the joystick should be on your left. When I say "front", I mean towards the keys, "back" towards the knobs.
- Have 3 cups for the different types of screws you'll find. A magnet-tipped screwdriver is *essential*, as some of the screws are hard to get to, and you don't want to lose them in there.
- Start by removing the bottom plate.
- Remove the right side panel -- there should be three bigger screws towards the front, and two smaller ones way down towards the back.
- Here's the tricky part... unplug all connectors from the center board. You might want to take some detailed pictures before you do that because there are some empty sockets on the board. It's actually easy to figure out what goes where because most connectors are of different sizes.
- Unplug the two red connectors that go to the left side of the key bed, and the one that goes to the small board on the key bed, but NOT the small white one. That's the aftertouch cable and it doesn't need to be disconnected.
- Unscrew the center board from the horizontal rail in the middle of the case. There should be 4 screws and a cable tie is connected to each one. There are 3 black screws in the back around the digital output slots (there wasn't a digital card on the Trinity I worked on.) -- unscrew those and remove the board VERY carefully not to pull any wires along the way.
- There are two silver plastic grounding slips -- one on the far left, one on the far right. I know you have to remove the left one, I'm not sure about the right one, but remove it just in case.
- Unscrew the long aluminum piece at the very front, the one that is under the keys when the keyboard is right side up.
- Unplug the small connector off the floppy drive. You can leave the ribbon cable connected. The are 4 screws (I think) that hold the floppy drive in place. Unscrew those and remove the drive.
- There should be 1 more screw holding the key bed in place, and it's right by one of the floppy drive screws. Get that one out and pull the key bed upward using the metal piece in the middle -- it may be stuck to the horizontal rail, even though it's unscrewed. Pry it up gently with a screwdriver if you have to. The key bed should come out. If it doesn't, check what might be keeping it in place. Don't ever force anything out of a keyboard.

OK, that's part one. Part two is fairly easy...

- Set the key bed on a table. Remove the long plastic strip at the top.
- To remove a black key, first you have to remove the two surrounding white keys. Grab the bottom part of the key (where you play it) and push towards the top (where there's a square hole). Pay very close attention to how the key is removed, because reinstalling it is the same way, just reversed (obviously). There's a flat spring underneath the key, don't worry if it pops out. It's pretty self-explanatory how to put it back.
- Remove the black key in the same manner. Most likely, the little tab that hooks the key onto the key bed is chipped or broken. In any case, you will need a new key -- unless, of course, it was just the spring that popped out.

Follow the instructions in reverse order to put it all back together. I typed this by memory, so I may have skipped a step or two. Taking this keyboard apart wasn't as easy as I expected, but not as hard as it looked. It just takes patience and being careful.

I hope this helps!