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Akai 4000DB Take-up Noise

CharlesFR

New Member
I have just been given an Akai 4000DB that hasn't been used in at least a decade, and the take-up reel makes a whirring noise while rotating (the supply reel does not). The sound continues if I stop the platter with my hand (which is quite easy to do, and bounds easier than it is for the supply reel when rewinding). The sound also does not occur when the take-up reel is being driven by the tape when rewinding. Also, the machine does not seem to fast forward.
I'm thinking it might have something to do with the idler, but I'm quite unknowledgeable on the matter. I've already obtained a scan of the service manual, and have no qualms opening the machine.
I've included a video with the sound.


I would greatly appreciate any help with or advice for both diagnosing the issue and/or remedying it.

Thank you!
 
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Having opened it up, the sound does seem to be coming from idler #2, which is harder on the edge than the one for rewinding.
 
how did it turn out?

I briefly swapped the two idlers, and that seemed to get rid of the noise problem during playback/fast-forward. I've since sent the hard idler and the pinch roller off to Terry Witt to have new rubber put on them, but when they got there he was on vacation (and I think he still may be). So, I haven't put the deck back together quite yet. I'll try to make sure to update this post once it is up and running.

Thanks for checking in!
 
i just picked one of these up a few days ago,i like the idea of dolby on a reel to reel ,it is fairly rear as far as i have seen , as a package deal i ended up with a sony tc-377 aswell so will have a look at that one later,
im thinking of starting work on the akai 4000db next week, i cant say i will keep it for long as i dont collect 7'' reel to reels ,
i tend to collect the 10.5'' models ,i like the way they look and sound,
good luck with your unit, have you checked the ball bearing /cam arrangement behind the two large lever switches?
they some times give head aches ,i have made replacement parts once or twice for that model,(im a boiler maker and handy with a lathe and mill some times lol)
ill post a pic or two for you if interested once i start mucking about with it,
what other gear are you using ?or are you fixing it to move on? either way you can get the bug lol

just tonight i have just finished recapping and painting a yamaha AX-700 and EQ-630 , THEY LOOK SMASHING, lots of fun all round

mike
 
i just picked one of these up a few days ago,i like the idea of dolby on a reel to reel ,it is fairly rear as far as i have seen , as a package deal i ended up with a sony tc-377 aswell so will have a look at that one later,
im thinking of starting work on the akai 4000db next week, i cant say i will keep it for long as i dont collect 7'' reel to reels ,
i tend to collect the 10.5'' models ,i like the way they look and sound,
good luck with your unit, have you checked the ball bearing /cam arrangement behind the two large lever switches?
they some times give head aches ,i have made replacement parts once or twice for that model,(im a boiler maker and handy with a lathe and mill some times lol)
ill post a pic or two for you if interested once i start mucking about with it,
what other gear are you using ?or are you fixing it to move on? either way you can get the bug lol

just tonight i have just finished recapping and painting a yamaha AX-700 and EQ-630 , THEY LOOK SMASHING, lots of fun all round

mike

That's really exciting! I hope they go as well for you as mine has been for me!
The Dolby is quite intriguing to me too - I know that B (and later C) was used for cassettes; do you know if this would be the one sometimes called A, or is it something else altogether?

10.5" sounds like lots of fun - makes me wish I had more space for equipment! I think some certain people wouldn't be too happy with me if I were to end up with one, though...

The two large switches seem to move great, and the ball goes back and forth quite nicely. If something goes awry with them, I'll get in contact with you - thank you!
The top of the pause switch and the knob that went on the track selector are missing, but aside from those everything seems to move very nicely.

As far as other gear goes, I don't have much else in the way of open reel decks. I'm a college student at the moment, and my father gave me the Akai (he was given it around 2007 by a coworker). I do have a portable mono Webcor that I replaced the filter cap and a belt in, but it sounds rather poor - I only really have it because it was in my grandparents' barn, and I was able to play some of the family's home recordings on it.
My reciever is just a hinky JVC RX-250 from a garage sale when I was younger, my primary cassette deck is a TEAC I fixed up (I can't remember the model, and I'm not in my apartment right now, but it's silver and has analog level meters, so late 70s-early 80s?), my main turntable is a Technics SL-B500 that my father gave me (though it's missing the tall spindle and the dust cover), and I've got some little Infinity speakers he also gave me. So, the setup isn't up to some people's standards, but that doesn't really bother me - I quite enjoy it!

I'm fixing the Akai up both for fun, and to use it. With it were a number of home recordings my father had, as well as a copy of The Association's "Insight Out". I've also ordered a few inexpensive prerecorded tapes online (some early Barba Streisand and such), and plan to get more when I can.

Oh! I'm planning to unwrap and dub to tape a copy of Scheherazade that I have in my record stack, so I can give the record to a friend of mine.

Don't go take any just for my sake, but if you've got pictures of the Yamahas, I'd love to see them!


Charles
 
it sounds like the record player and tape deck are keepers for sure,
i had a teac a-450 for years ,the value is only ever going to rise ,the record player is a rare beast where i am and would be very valuable, try to keep hold of those,
well done on the tape deck with doing your repairs, your father will be proud ,
you have the makings of a very good system,

it need not be a big system to sound great ,so dont worry about that,
some of us do get carried away some times and forget its about the listening to the music and not the owning of the biggest best gear, i am a victim of this , but in saying that i like the design and and performance that some gear is capable of ,
plus some of it is very easy on the eye!!

ill get back to you on what mode of dolby the akai's have , i would say they have the frist mode, which may very well be labelled ''A''

also well done on the webcor repair,

some pics of the yamaha stuff in bits and on the coffee table now still in bits but almost ready to bolt the covers on

and i will send a pic of what my system looks like

mike056.JPG 057.JPG 058.JPG 065.JPG 066.JPG 056.JPG 057.JPG 058.JPG 065.JPG 066.JPG 069.JPG 070.JPG 071.JPG 072.JPG
 
it sounds like the record player and tape deck are keepers for sure,
i had a teac a-450 for years ,the value is only ever going to rise ,the record player is a rare beast where i am and would be very valuable, try to keep hold of those,
well done on the tape deck with doing your repairs, your father will be proud ,
you have the makings of a very good system,

it need not be a big system to sound great ,so dont worry about that,
some of us do get carried away some times and forget its about the listening to the music and not the owning of the biggest best gear, i am a victim of this , but in saying that i like the design and and performance that some gear is capable of ,
plus some of it is very easy on the eye!!

ill get back to you on what mode of dolby the akai's have , i would say they have the frist mode, which may very well be labelled ''A''

also well done on the webcor repair,

some pics of the yamaha stuff in bits and on the coffee table now still in bits but almost ready to bolt the covers on

and i will send a pic of what my system looks like

mike
Yeah, I'm definitely not getting rid of the deck or the turntable. I love them!

Gosh, thank you! I've really been enjoying everything - just wish I had more time!

Wow, that all looks fantastic - thank you for sharing!
(I've gotta say, though - the 11th picture is undoubtedly the best)

Charles
 
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Yeah, I'm definitely not getting rid of the deck or the turntable. I love them!

Gosh, thank you! I've really been enjoying everything - just wish I had more time!

Wow, that all looks fantastic - thank you for sharing!
(I've gotta say, though - the 11th picture is undoubtedly the best)

Charles
yeah i agree ,he is my special boy , he is about 12months old,well yamaha done , on to the akai now ,
it turns out it has next to no thing bad going on other than running abit fast , so a lube and clean and its as good as new,
oh i am making some new wooden side panels for it tomorrow ,
im going to do some research regarding the speed problem, might ask here, i think ill make a start on the sony tonight as well ,how did your day go mate,
have a good one
mike
 
yeah i agree ,he is my special boy , he is about 12months old,well yamaha done , on to the akai now ,
it turns out it has next to no thing bad going on other than running abit fast , so a lube and clean and its as good as new,
oh i am making some new wooden side panels for it tomorrow ,
im going to do some research regarding the speed problem, might ask here, i think ill make a start on the sony tonight as well ,how did your day go mate,
have a good one
mike
He's extremely handsome!

That's very good to hear; it's always great when things go smoothly!
New panels sound very cool, and I bet that's not often done. I'll be curious to see the results!

I hope you're alble to get the speed issue sorted. I've got a scan of the service manual I found online (on hifiengine, I think), but it says it's too large of a file to attach to this post.

My day's been going real well! I'm about to head out to dinner and a concert with some friends and classmates of mine - should be very fun!

You have a good one too!
Charles
 
Yeah, I'm definitely not getting rid of the deck or the turntable. I love them!

Gosh, thank you! I've really been enjoying everything - just wish I had more time!

Wow, that all looks fantastic - thank you for sharing!
(I've gotta say, though - the 11th picture is undoubtedly the best)

Charles
how did the repair go?
 
how did the repair go?
I'm afraid I still haven't gotten the rollers back from Mr. Witt; he's either still on vacation, or working his way through the backlog, and, though I'm very curious, I don't want to rush or pester him.

Did those new wood panels come out well?
 
if i was to tell the truth
I'm afraid I still haven't gotten the rollers back from Mr. Witt; he's either still on vacation, or working his way through the backlog, and, though I'm very curious, I don't want to rush or pester him.

Did those new wood panels come out well?
well i have been busy with the sony , i have finished it and is looking and sounding as it should, doing wood work tomorrow i plan ,but plans are always being interrupted,if you have no luck with parts i can try to look for some at my end for you,but they are rare,but might have a few mates that might have some old stock floating about , see how you go,but postage could be expensive,so how are the study's going?
mike1182877787.jpg 1182877831.jpg 1182877909.jpg 1182878131.jpg 1182878198.jpg
 
well i have been busy with the sony , i have finished it and is looking and sounding as it should, doing wood work tomorrow i plan ,but plans are always being interrupted,if you have no luck with parts i can try to look for some at my end for you,but they are rare,but might have a few mates that might have some old stock floating about , see how you go,but postage could be expensive,so how are the study's going?
mike]

Sorry for the delay in responding - I've been having exams this week, but I'd say they're going pretty well.

Woah, holy moly! That's beautiful! Looks like you did a fantastic job!

The rollers have just arrived to the friend's house I had them sent to (I didn't want to deal with my university's mail system). I'm not sure if I'll be able to get them tonight, or if I'll have to wait until tomorrow. If I do get them tonight, I'll put them on and give it a run tonight, but if I don't until tomorrow, I may have to wait a little longer still due to other plans I have. Either way, when I do, I'll let you know how it goes!

I should be all good as far as parts go - the switch top and knob aren't important, and I don't feel the need to try and restore it cosmetically at this time. I really really appreciate the offer, though! Thank you!
If things change on my end, I'll let you know.

Charles
 
I've got the parts, and the deck is working great! Haven't put the guts back in the "shell" (if you will) yet, but have been playing a bunch of the unlabeled tapes my father gave me, and am really enjoying it! Got to hear my grandfather's voice (and, less importantly, Neil Diamond!).
 
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