Hello, and welcome to another episode of 8-Bit Keys.
Today I'm going to be taking a look at this Yamaha PSR-6.
This was donated to me by Chris Lane back in June, and I'm just now getting a chance
to take a look at this thing.
It's really dirty.
So I'm going to, first thing I'm going to do is clean it up.
Probably going to have to disassemble it.
So, we'll get a chance to look at the inside.
And then we'll see what kind of music it's capable of producing.
Maybe I'll write something with it, so let's dig right in!
So, as you'd probably expect the first thing I'm going do with this thing is take it
apart.
This thing comes apart in a little bit of a weird way since there are several smaller
piece of the case that come off separately.
I'm curious to see the main board as the guy who sent this to me said it sounded like
a Yamaha DX-7.
Anyway, so here it is.
The main board looks pretty bare.
In fact, there's really only two chips on this board.
And one of them is the YM2413, which is a very low-end FM synthesizer chip.
So, I think that's going to rule out the DX-7 similarity.
OK, so I'm going to need to disconnect the battery compartment, to help separate this
thing.
Next, there's this ribbon cable that comes from the main board to the key mechanism.
I tried pulling this thing out, with no luck.
Next, I tried using some tools to see if I could find any plastic hooks that might be
holding on, but all I ended up doing was breaking the side off the connector.
Well, I've never seen a connector exactly like this, but whatever it is, it's not
coming out, at least without breaking something.
So I guess It's going to have to stay right there.
However, I think I can work around this problem, especially by removing a few more screws And
it will also help to desolder the speaker.
I've also never seen a speaker with a center ground wire like this.
That's really odd and I have no idea what it's purpose is.
It will also help to desolder these two ground wires.
OK, so leaving the ribbon cable connected, I turned it over and and I do have access
to this piece here, which is what keeps the keys held in place.
So I should be able to unscrew all of these screws, and remove the keys.
Unfortunately, I hit another snag.
Even with the screws removed, this piece does not want to come off.
It appears snapped in place, but when I tried to pry it out, I ended up cracking the plastic
in a few places, so apparently this was not meant to ever come apart again.
So, at this point, foiled by two irritating problems, I'm just going to clean the keys
right here where they are.
At least I can clean the entire length of the keys like this, without the bezel getting
in the way, but I still can't easily clean between the keys, which I always feel is a
requirement for a total restoration.
And, it won't really be possible to clean these areas, at least not easily, fortunately,
it won't be visible when it is reassembled.
On the bright side, you can see a huge difference between the keys I've cleaned and the ones
I haven't done yet.
Because I've only cleaned from here down.
OK, so the keys are, for the most part clean.
Now, I'm going to turn my attention to this board here.
I think this should be easy to remove.
And then I can clean those nasty switches on the other side.
So I'll start by removing these screws..
And there were quite a few holding that board down.
OK, so let's lift this thing off.
At this point, it's a good idea to take a still photo of how everything is positioned
here.
I'll lift off these pads, and these are really dirty too.
It's also a good idea to take another photo of the arrangement of all of the colored buttons,
otherwise I won't remember where the different colors go when it's time to reassemble.
The proper way to do this is probably to remove each button one at a time, but I tried dumping
them out.
Which didn't work very elegantly.
Now we can get a look at these buttons and see that they need some cleaning.
But the main concern I have are these switches.
I need to remove these, that will make it easier to clean all of that gunk down in these
recessed areas.
These are usually just held on by friction, so you can pry them off with a screwdriver.
When I took the switches out, I noticed these tiny metal ball bearings and little springs
laying on the bench.
So I made sure to keep track of those for later.
All right, so I've done all of this disassembly mainly just to get to this point.
Using a jet of water like this is the best and easiest way to clean out all of the crevices
on this thing.
Drying it off, I can already see a massive difference.
By the way, I found the data code on the plastic.
It looks like this was made in September of 1988.
Time to clean these buttons.
And now it's time to see if I can re-assemble these switches.
I guess these little springs go in here, along with the ball bearing.
I believe these help to give the switch a feeling of different notches in the movement.
The trick is going to be to see if the ball will stay in place long enough to get the
switch seated.
Fortunately, its kind of greasy and so that helps hold the ball in place.
And here they are.
This looks so much better than it did earlier.
And the switches are moving perfectly.
Next I can start putting these buttons back in, fortunately I can reference the picture
I took earlier.
Also these pads could use a little help, so I'm just going to rinse them off in the
bathroom sink.
Yes, these look much better now.
These just lay right down and there are little pegs that hold them in place.
Well, I guess it's time to put the logic board back in place now.
Ok, it's all finished, let's have a look!
This looks almost like a different keyboard.
I can actually play this without cringing now!
So, let's plug in some power and turn it on!
Ok, so now I'm going to show you some of the sounds on this thing.
I'll start with the piano, but I'll warn you right now, even high-end FM keyboards
can't make a very realistic piano, so it goes without saying this one won't sound
that great.
It does help to turn on the sustain mode.
I
also like this flue plus harpsichord instrument.
It has several stringed instruments like the violin.
But all of them sound terrible.. except for number 43 which is strings.
It has several neat sound effects, I particularly like comet.
And babydoll.
All right, so the sounds on this keyboard are really not that great.
It's got a sound bank of 100 sounds, but to be honest I only find about 15 of those
sounds to be really usable.
And there really aren't any good lead instruments.
That was probably one of the biggest troubles I had when trying to create a song on here,
there's just no good lead instruments.
Also, It's got this annoying popping sound that you can hear.
It seems to be worse on some instruments than others and it's kind of random but you just
hear this popping noise when you play certain sounds.
And you're going to hear that in the song that I created here in a little bit because
I mean you can edit that out, but it's kind of a pain so you know I just thought for authenticity
sake, I'm just going to leave the popping sound in there.
But, if you think the hundred sounds it has on the sound bank sound familiar, well I thought
they sounded familiar too.
And I kept thinking to myself I've heard some of these sounds before, well it's from
the Yamaha PSS-270.
And I've actually done two videos on this keyboard in the past, so I'm not going to
go into a great amount of detail in how the YM2413 chip because this has the same chip
and I did a lot of that detail in that previous video.
But, these share the exact same chip.
In fact, if you look at the logic board on one you'll see the YM2413 and if you look
at the logic board on the other you'll see the same chip.
Now, at first I thought maybe the larger chips would also be the same because all of the
controls on the keyboards are the same.
But, the main chips are a little different.
And, that's probably because I noticed they have different demo tunes.
Now, also the PSS-270 is stereo, where this unit is mono.
Now, the synthesizer chip in both of these, of course is a mono synthesizer chip, but
what they're doing in this keyboard is there's just some analog electronics that are just
kind of wobbling the sound between the two speakers very quickly to kind of give it a
stereophonic sound, and there's a button here that you can either enable or disable
that feature.
So, really, I don't consider the stereo to be any big advantage to this keyboard over
that one.
Anyway, I would honestly, you know, on my toy meter, I would probably rank both of these
keyboards as just a hair over being a toy, because the sound quality is not that great,
you can see with the construction of the inside of these things that that they were designed
with cheapness in mind and not necessarily quality.
In fact, even though this is a really cool-looking keyboard and you know it's kind of big,
I honestly don't think it's all that much better than this square wave keyboard that
I have up here.
I mean, it's just one notch above a square wave keyboard.
But, nevertheless, even though I've already done a song on here before, that wasn't
actually one of my songs, so I thought wouldn't it be interesting to go ahead and take on
the challenge of creating a song myself on this keyboard, so, that's what I've done
and well, I'm going to let you here it.
All right, so I hope you liked that, it was quite challenging finding instruments on this
that would work for a reasonably good tune.
Also, I wanted to give you a little demonstration of the two different demo tunes between these
two keyboards.
Also, I forgot to mention this in the review I did on the PSS-270, but you can hold down
the right two keys during power up and it will go into a test mode.
At this point, all of the buttons on the keyboard will play music, presumably so they could
test them at the factory.
Interestingly enough, the PSR-6 does not do this.
Well, that about wraps it up for this episode.
I wanted to give you a little preview of what you're going to be seeing in the next episode.
Now, this definitely qualifies as a toy keyboard.
But it's kind of a very funny little device and I'm going to do some modifications on
it and see what kind of music I can make with this in the next episode.
So, stick around for that, and thanks for watching!
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