Download "Yamaha KX-200 cassette deck repairs"
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00:00:00
here is a 1987 yamaha00:00:03
model kx 200 cassette deck00:00:07
this has got some pretty severe problems00:00:10
the least of which00:00:11
is the eject mechanism is messed up00:00:14
it's not the door that's jamming it's00:00:17
actually the mechanism00:00:19
that does not fully release the door00:00:22
with a cassette inside we find out00:00:27
there is no fast forward no00:00:30
rewind and no playback00:00:34
and before you say oh that's simple00:00:37
it's just a bad belt the belt in this00:00:40
appears to be fine here is the inside00:00:44
of the cassette deck the top cover00:00:46
screws00:00:47
are missing so it's easy to open up00:00:50
the mains power cable has been00:00:54
replaced improperly there is no strain00:00:57
relief00:00:58
in the back i can just stick my finger00:01:00
through the hole right here00:01:03
here is the mechanism it's a two motor00:01:06
mechanism relatively simple i would say00:01:10
this is a sort of a middle of the line00:01:13
cassette deck00:01:15
the first problem is the eject now if i00:01:17
push eject00:01:19
it moves a little bit but not much00:01:23
and see this whole entire top part00:01:26
this is supposed to go all the way down00:01:28
like that00:01:30
but it doesn't so00:01:34
likewise the latch that latches the00:01:36
cassette door00:01:38
does not fully retract so that's why00:01:41
the deck won't the the door won't00:01:44
open now the nice thing is this cassette00:01:47
deck is simple enough so that it00:01:49
will let you activate all the functions00:01:51
even without a cassette inside00:01:54
taking a closer look if we activate fast00:01:57
forward00:01:59
this motor right here is running00:02:03
but the00:02:06
associated real doesn't run00:02:13
you can hear it does not release the00:02:16
break00:02:17
and that is most likely the problem that00:02:19
is00:02:20
why fast forward and likewise00:02:23
rewind are not working00:02:26
because connecting this motor to00:02:29
these real hubs are only some gears00:02:33
so there are no belts there are no idler00:02:36
wheels there is nothing that could go00:02:38
bad so i'm pretty sure00:02:45
the fault is that it doesn't release the00:02:47
brakes00:02:49
likewise the problem with playback is an00:02:52
unusual one you can hear00:02:56
this motor is running to drive the00:02:59
take-up reel00:03:03
but once again it doesn't release the00:03:05
break so this motor does not succeed00:03:08
now while i do notice the counter belt00:03:11
is missing00:03:12
which indicates that somebody has had00:03:14
this mechanism out before00:03:17
from what i can see the capstan belt00:03:20
is there it's in place it looks to be00:03:23
fine00:03:25
the problem is that00:03:29
the motor doesn't turn the motor seems00:03:32
to be00:03:33
dead if i measure the voltage on the00:03:37
motor00:03:40
you can see the motor does get00:03:44
power for some reason it only gets00:03:47
10 volts that's a little bit low but00:03:50
power is present yet the motor does not00:03:54
turn to continue the diagnosis i'm going00:03:57
to00:03:58
take out the mechanism there are two00:04:00
screws down there00:04:01
two screws down there these two screws00:04:05
hold the mechanism to the front00:04:07
and the decorative cover on the cassette00:04:10
door00:04:11
needs to come off with the mechanism00:04:14
turned on its side00:04:15
we can see what is wrong with the eject00:04:18
mechanism00:04:20
there is this main lever and you can see00:04:23
there is this piece right there00:04:26
that's blocking this lever from moving00:04:29
down00:04:30
far enough to release the door see the00:04:33
door is still00:04:34
caught on this catch00:04:38
now this piece seems to be there00:04:42
intentionally so my guess is when the00:04:45
capstan drive00:04:47
failed the cassette deck had just00:04:50
started to engage one of the functions00:04:53
so it had not yet released the real00:04:56
brakes it had not yet00:04:58
moved the head bridge or anything like00:05:01
that but it had already moved this piece00:05:05
outwards to lock the door00:05:08
so in fixing the problem with the00:05:11
capstan drive00:05:13
we should also be able to solve this00:05:15
problem with the eject mechanism00:05:17
in fact we now have a pretty good00:05:19
vantage point00:05:21
this is a counterclockwise motor so if i00:05:24
if i try to get in here with a00:05:26
screwdriver you can see00:05:28
there is a belt the belt00:05:31
might be a little bit loose but it's00:05:33
still there still looks fine00:05:37
if i try to move this counterclockwise00:05:44
oh00:05:49
okay well i i was expecting by sort of00:05:51
uh00:05:52
rubbing the screwdriver across the belt00:05:54
i'd be able to00:05:55
turn this but this motor appears to be00:05:59
seized00:06:01
the electronics are still working and00:06:03
they are loading down the power supply00:06:05
and that's00:06:06
why we're measuring only 10 volts00:06:09
at the motor okay00:06:13
so i'd say this motor needs to come00:06:16
out let's start disassembling the00:06:19
mechanism00:06:20
now first of all there is a spring down00:06:23
here i have no idea what it does because00:06:26
it doesn't seem to pull anything00:06:28
together00:06:29
but i'm going to unhook it there it is00:06:32
as you can see00:06:35
next i'm going to mark00:06:38
this cable to make sure i remember it's00:06:41
the first position in this connector00:06:44
this goes down00:06:46
into a switch right there it is a switch00:06:49
so maybe the polarity of this doesn't00:06:50
matter but00:06:51
who knows better to be safe00:06:55
now you push down on this connector to00:06:58
release it that's these two cables00:07:02
out and those are the only cables i'm00:07:04
going to remove00:07:05
i think i can get away with leaving all00:07:08
the other cables in place00:07:11
so this screw only holds the circuit00:07:14
board in place so we don't need00:07:16
to worry about that but this screw00:07:22
next screw is in that corner00:07:28
take that out and then we have a third00:07:31
screw00:07:32
that you can just make out through a00:07:34
hole in this circuit board00:07:37
this is going to be interesting to get00:07:39
back into place once the repairs are00:07:42
done00:07:44
might be doable with a magnetic00:07:45
screwdriver00:07:47
and now this uh yep the back plate is00:07:50
now00:07:51
loose and we can lift it off00:07:56
and uh of course making sure that we00:07:59
don't break anything see it's00:08:03
it's now getting caught on the cables00:08:06
but as i said i think we don't need to00:08:08
remove any more of those00:08:11
it's only a matter of untangling them00:08:14
giving them some slack00:08:20
okay that's looking good00:08:25
and there we have the other side00:08:29
let's uh get rid of this belt or00:08:32
actually this this belt is in really00:08:37
good condition00:08:38
so that's going back in now the mo00:08:41
yeah the motor it will turn00:08:45
kind off but it's00:08:48
it's definitely not spinning freely now00:08:51
the motor turns counterclockwise so for00:08:54
from this vantage point we have to turn00:08:57
this00:08:59
clockwise and yeah see00:09:02
this cam gear is engaged00:09:08
and okay was that it00:09:12
seems like we're back in stop mode00:09:15
so let's uh let's see let's move this00:09:18
back down00:09:21
and move this around00:09:25
no the uh the catch00:09:28
no look00:09:32
i the catch is right there but it has00:09:35
retracted00:09:36
so eject works again so that is the00:09:40
first problem00:09:41
solved i tried lubricating the00:09:44
original motor with a silicon oil00:09:47
but if anything that has made it even00:09:50
worse00:09:51
this is almost impossible to turn now00:09:54
and then i got lucky i took out the00:09:58
motor and just to confirm one last time that00:10:01
it was bad00:10:03
i turned the pulley manually and i00:10:06
turned it quite forcefully00:10:08
and that was when the silicon oil00:10:10
finally made it down into the bearing00:10:12
and look at that00:10:17
that is running nice and freely now00:10:21
i fixed it i can apply power00:10:27
and as you can see and here it's running00:10:32
and it's running silently so00:10:35
i can put this motor back in i cleaned00:10:38
the pulley00:10:39
and the flywheel with isopropyl alcohol00:10:42
i applied some fresh white lithium00:10:45
grease to the00:10:46
back bearing of the capstan because the00:10:49
original stuff was00:10:50
kind of sticky and i cleaned00:10:54
the belt with window cleaner00:10:57
this is in really good shape so this is00:11:00
going back00:11:01
in and to do this00:11:04
i'm going to hook the belt over this00:11:08
uh metal piece that's standing up over00:11:11
there00:11:12
to hold it in place while i reassemble00:11:15
everything00:11:17
hold the belt to the flywheel and00:11:20
see try to bring it across00:11:24
without touching it to the center00:11:26
because that has00:11:27
grease on it like so00:11:36
almost okay00:11:39
now you got to look around in these00:11:41
mechanisms because00:11:42
that is how the manufacturers of these00:11:45
things are doing it00:11:47
while assembly themselves they have a00:11:50
place to store the belt while the00:11:54
back piece with the motor on it00:11:57
goes in place now i'm going to move this00:12:00
down into place and00:12:03
i well i have to say this would be00:12:06
easier to do without00:12:09
camera in the way00:12:16
yeah something00:12:20
something does not quite want to00:12:24
align on this side yeah00:12:27
i'll have to turn off the camera for00:12:29
this i'm sorry00:12:30
everything went to plan i was able to00:12:33
very easily transfer00:12:35
the belt from the metal post on the00:12:38
chassis00:12:39
to the motor pulley i now have the00:12:42
mechanism loosely put back in place00:12:47
power is reapplied let's see00:12:51
if the mechanism now behaves a bit00:12:54
better00:12:59
oh that's looking good we got fast00:13:04
forward00:13:06
and we have rewind00:13:12
and it looks like we have playback yep00:13:16
i can see some signal registering on the00:13:19
vu meter i now have the cassette deck00:13:22
connected to an amplifier00:13:24
and as you can hear00:13:26
[Music]00:13:30
it does work it does play00:13:33
but there is a problem and you can hear00:13:36
it if i insert a blank cassette00:13:41
hear that really annoying ticking noise00:13:46
well this had me puzzled for a little00:13:48
while but00:13:50
i finally figured it out and it's very00:13:52
easy to00:14:00
repair00:14:03
yeah the ticking is because the00:14:05
mechanism was not grounded properly00:14:09
i took the mechanism back out because i00:14:12
still need to replace the counterbelt00:14:15
and for that i'm going to take out this00:14:18
decorative00:14:19
back piece it's also a good opportunity00:14:22
to clean that00:14:24
this in theory is a nice mechanism you00:14:27
can see00:14:28
we have gears where older00:14:31
mechanisms had various idler wheels00:14:34
of course the idler wheels over the00:14:36
years go bad00:14:38
and then you lose torque on the take-up00:14:40
and supply reels00:14:43
this mechanism has gears those don't go00:14:46
bad00:14:48
or do they unfortunately i'm now00:14:52
finding confirmed what i had been00:14:54
thinking00:14:55
all this time this is the same mechanism00:15:00
as you find in a denon drm-0700:15:05
as well as another techniques cassette00:15:08
deck i don't remember the model number of00:15:10
that00:15:11
the denon drm-07 was my very first00:15:15
cassette deck00:15:16
i got that from my parents and00:15:20
the problem with that you can see00:15:23
there is the gears right here in between00:15:27
there is this gear on the rear drive00:15:31
motor00:15:32
this is a relatively thick gear but00:15:36
down below is a very thin gear00:15:40
and that is what transfers motion from00:15:43
the motor00:15:44
over to the take-up and supply reel00:15:48
and this very thin gear00:15:51
goes bad it's the same thing as happens00:15:54
with many00:15:55
phillips cassette decks this material00:15:59
it's kind of a00:16:00
soft plastic to reduce noise00:16:03
and this goes even softer and then the00:16:06
teeth00:16:07
start breaking off and that happened00:16:11
on the denon drm-0700:16:14
over time at first you had a clicking00:16:17
noise00:16:18
because only one tooth was broken and it00:16:21
would skip over00:16:22
that but eventually more and more of00:16:24
these teeth broke off00:16:26
and then finally there was no more00:16:29
drive to the take-up and supply reels00:16:32
the same problem also on this uh00:16:36
techniques cassette deck on that when i00:16:38
got it this gear was already broken so00:16:41
the deck was unrepairable yes00:16:45
unrepairable unfortunately i have to say00:16:49
this because00:16:50
there is always this crowd of people00:16:52
that says00:16:53
oh it's no problem at all you can just00:16:56
3d print a replacement it's00:16:59
magic yeah00:17:03
it's not magic it's impossible00:17:06
see if i try to zoom in a little bit00:17:10
the camera makes this look relatively00:17:13
big00:17:14
but this i mean take the screwdriver for00:17:17
comparison this00:17:18
is a tiny little screwdriver this gear00:17:21
you can see a tooth right there this is00:17:23
even smaller00:17:24
3d printers have a limited resolution00:17:29
you can't print something like this00:17:33
you can't no it's impossible00:17:36
so please don't tell me to 3d print a00:17:40
replacement00:17:42
so anyway to cut a long story short00:17:47
unfortunately this yamaha cassette deck00:17:50
probably won't last forever reassembly00:17:54
is the reverse of disassembly and there00:17:57
is the new counterbelt and here is00:18:02
the new power cord complete with00:18:05
the proper strain relief and00:18:08
testing the playback speed00:18:12
it's fine it's very close as you can see00:18:16
so i'm not going to mess with it one00:18:19
interesting thing i noticed this00:18:22
right here looks like a bit of a problem00:18:26
the two channels don't play back00:18:29
at the same level but this must be a00:18:33
deficiency of the circuitry00:18:36
because if i go and unplug the scope00:18:40
and plug in the other channel of00:18:44
the amplifier00:18:47
that fixes it and there it00:18:50
is the 1987 yamaha model kx00:18:55
200 cassette deck all cleaned up00:18:59
including the heads i found some new00:19:02
screws for the top cover00:19:03
it has all been put back together and00:19:07
i just made this test recording00:19:26
[Music]00:19:50
do00:19:53
[Music]00:20:04
do00:20:05
[Music]00:20:09
thank you for watchingDescription:
This 1987 Yamaha KX-200 Natural Sound stereo cassette deck has some pretty severe problems... or has it? Follow me on Instagram: https://www.facebook.com/unsupportedbrowser Check out my YouTube channel: https://www.youtube.com/user/DrCassette Also check out my other YouTube channels: https://www.youtube.com/user/vistavox https://www.youtube.com/user/plustotal
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