nakamichi mb-2 disc loading problem - diyAudio
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Old 11th October 2011, 08:47 PM   #1
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Default nakamichi mb-2 disc loading problem

Hi. I'm new to this.
I have an early 90's Nakamichi MB-2 multi-disc cd player. When I load a cd it goes in fine but when I press play the drawer just opens back up and slides back out. I don't think it spins at all during that time. I'd appreciate any help I can get to fix this. thanks
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Old 12th October 2011, 02:36 AM   #2
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If we are talking about an MB-2, and not an MB-2s, the first thing to check is whether or not the second stage of loading is happening fully. To check, you need to remove the top cover & observe what happens when you load a disc. Whether you hit play or not, once the drawer is closed fully, the second step is for the laser/transport mech to be lifted up under the cd until the cd is clamped & free to spin. If you aren't sure, just turn off power as soon as the mech stops doing anything & try spinning the cd with your finger. Should spin free & level, securely clamped by the magnetic clamper on top of it to the platter of the transport mech.
If this checks out, power up again, load a disc & see if, after cd is clamped, the disc spins within five seconds or so of clamping. If not, try re-loading & see if it starts spinning once you give it a clockwise spin with your finger. If yes, the platter motor needs work or replacement. If not, you may have a fairly rare case of a bad Sony KSS-210A laser.
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Old 12th October 2011, 06:37 PM   #3
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Default Thanks!

very helpful info. Thanks a lot! I do have a Japan made MB-2, not the MB-2s. I also failed to mention that the unit was taken in for repair for the same problem years ago. They replaced a small part but I can't remember what it was. If it was the laser then I'm wondering if the laser is good and the connection is bad. I think you sent me on the right track though. I just have to figure out what to remove to access the laser and it's wires.
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Old 13th October 2011, 02:44 AM   #4
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Usually the only thing the MB-1/2/3, aka CDPlayer1/2/3, need is belts, primarily the main loading belt, i.e., tray belt. You can greatly extend the life of that tray belt by reducing the tension of the roller-ended leaf spring that catches the tray at the very back end of the tray guide rail. This spring roller holds the tray fully closed to counter some play in the drive mech, and the tension is excessive, causing premature belt slip. There are two other belts, both of which require removal of the entire mech from the unt to access. One drives the laser/transport up & down, and the other moves the changer trays unit up & down.
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Old 14th October 2011, 02:15 AM   #5
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Great - I'll look at the belts too. It might take a while because a friend has the unit and he's out of town for a week, but we'll work on it. Thanks.
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Old 5th June 2013, 07:40 AM   #6
cchean is offline cchean  United States
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My CD player 2 has developed a similar problem. It does not show the common symptoms of sticky drawer or worn belts. However, it is not loading disc #3. I opened up the cover and I was able to narrow down the problem. When loading discs, whenever I try to load disc #3 the tray will not go all the way into the magazine. About 1/4" will stick out and I can hear the motor spinning until it gives up and the drawer opens again. Sometimes an "err" message will appear on the display. If I help and push the tray into the magazine with a toothpick or a small screwdriver, then it will work as normal. But when disc #3 is unloaded and loaded again the same problem will arise. I noticed that if I load 5 discs, instead of 6, leaving the #3 slot empty will do the trick. Is there a cure for this or should I replace the whole magazine? Any input is appreciated. Thanks.
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Old 16th June 2013, 07:37 AM   #7
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Default sorry for the delay

I actually never did look into this unit. I just donated it to a friend's fix-it-later collection and he hasn't opened it up yet. I'm completely guessing here, but if everything works except for #3 maybe there's a problem with the belt that moves the tray unit vertically, or whatever mechanisms that belt drives, when it's trying to load #3. I don't know if there's a tension adjustment for that, but if that's been ruled out, then maybe something is worn or broken on the magazine for that position. Sorry if this info is useless. I just haven't removed the changer mechanism to see those other belts that stephensank was referring to, so I don't know what's there.
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